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/11.2/sys/netinet6/in6.c 333624 2018-05-15 09:40:52Z hselasky $");
   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/eventhandler.h>
   72 #include <sys/errno.h>
   73 #include <sys/jail.h>
   74 #include <sys/malloc.h>
   75 #include <sys/socket.h>
   76 #include <sys/socketvar.h>
   77 #include <sys/sockio.h>
   78 #include <sys/systm.h>
   79 #include <sys/priv.h>
   80 #include <sys/proc.h>
   81 #include <sys/time.h>
   82 #include <sys/kernel.h>
   83 #include <sys/lock.h>
   84 #include <sys/rmlock.h>
   85 #include <sys/syslog.h>
   86 
   87 #include <net/if.h>
   88 #include <net/if_var.h>
   89 #include <net/if_types.h>
   90 #include <net/route.h>
   91 #include <net/if_dl.h>
   92 #include <net/vnet.h>
   93 
   94 #include <netinet/in.h>
   95 #include <netinet/in_var.h>
   96 #include <net/if_llatbl.h>
   97 #include <netinet/if_ether.h>
   98 #include <netinet/in_systm.h>
   99 #include <netinet/ip.h>
  100 #include <netinet/in_pcb.h>
  101 #include <netinet/ip_carp.h>
  102 
  103 #include <netinet/ip6.h>
  104 #include <netinet6/ip6_var.h>
  105 #include <netinet6/nd6.h>
  106 #include <netinet6/mld6_var.h>
  107 #include <netinet6/ip6_mroute.h>
  108 #include <netinet6/in6_ifattach.h>
  109 #include <netinet6/scope6_var.h>
  110 #include <netinet6/in6_fib.h>
  111 #include <netinet6/in6_pcb.h>
  112 
  113 VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix);
  114 #define V_icmp6_nodeinfo_oldmcprefix    VNET(icmp6_nodeinfo_oldmcprefix)
  115 
  116 /*
  117  * Definitions of some costant IP6 addresses.
  118  */
  119 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
  120 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
  121 const struct in6_addr in6addr_nodelocal_allnodes =
  122         IN6ADDR_NODELOCAL_ALLNODES_INIT;
  123 const struct in6_addr in6addr_linklocal_allnodes =
  124         IN6ADDR_LINKLOCAL_ALLNODES_INIT;
  125 const struct in6_addr in6addr_linklocal_allrouters =
  126         IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
  127 const struct in6_addr in6addr_linklocal_allv2routers =
  128         IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT;
  129 
  130 const struct in6_addr in6mask0 = IN6MASK0;
  131 const struct in6_addr in6mask32 = IN6MASK32;
  132 const struct in6_addr in6mask64 = IN6MASK64;
  133 const struct in6_addr in6mask96 = IN6MASK96;
  134 const struct in6_addr in6mask128 = IN6MASK128;
  135 
  136 const struct sockaddr_in6 sa6_any =
  137         { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
  138 
  139 static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *,
  140         struct in6_aliasreq *, int);
  141 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
  142 
  143 static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *,
  144     struct in6_ifaddr *, int);
  145 static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *,
  146     struct in6_aliasreq *, int flags);
  147 static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *,
  148     struct in6_ifaddr *, int, int);
  149 static int in6_broadcast_ifa(struct ifnet *, struct in6_aliasreq *,
  150     struct in6_ifaddr *, int);
  151 
  152 #define ifa2ia6(ifa)    ((struct in6_ifaddr *)(ifa))
  153 #define ia62ifa(ia6)    (&((ia6)->ia_ifa))
  154 
  155 
  156 void
  157 in6_newaddrmsg(struct in6_ifaddr *ia, int cmd)
  158 {
  159         struct sockaddr_dl gateway;
  160         struct sockaddr_in6 mask, addr;
  161         struct rtentry rt;
  162         int fibnum;
  163 
  164         /*
  165          * initialize for rtmsg generation
  166          */
  167         bzero(&gateway, sizeof(gateway));
  168         gateway.sdl_len = sizeof(gateway);
  169         gateway.sdl_family = AF_LINK;
  170 
  171         bzero(&rt, sizeof(rt));
  172         rt.rt_gateway = (struct sockaddr *)&gateway;
  173         memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
  174         memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
  175         rt_mask(&rt) = (struct sockaddr *)&mask;
  176         rt_key(&rt) = (struct sockaddr *)&addr;
  177         rt.rt_flags = RTF_HOST | RTF_STATIC;
  178         if (cmd == RTM_ADD)
  179                 rt.rt_flags |= RTF_UP;
  180         fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS : ia62ifa(ia)->ifa_ifp->if_fib;
  181         /* Announce arrival of local address to this FIB. */
  182         rt_newaddrmsg_fib(cmd, &ia->ia_ifa, 0, &rt, fibnum);
  183 }
  184 
  185 int
  186 in6_mask2len(struct in6_addr *mask, u_char *lim0)
  187 {
  188         int x = 0, y;
  189         u_char *lim = lim0, *p;
  190 
  191         /* ignore the scope_id part */
  192         if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
  193                 lim = (u_char *)mask + sizeof(*mask);
  194         for (p = (u_char *)mask; p < lim; x++, p++) {
  195                 if (*p != 0xff)
  196                         break;
  197         }
  198         y = 0;
  199         if (p < lim) {
  200                 for (y = 0; y < 8; y++) {
  201                         if ((*p & (0x80 >> y)) == 0)
  202                                 break;
  203                 }
  204         }
  205 
  206         /*
  207          * when the limit pointer is given, do a stricter check on the
  208          * remaining bits.
  209          */
  210         if (p < lim) {
  211                 if (y != 0 && (*p & (0x00ff >> y)) != 0)
  212                         return (-1);
  213                 for (p = p + 1; p < lim; p++)
  214                         if (*p != 0)
  215                                 return (-1);
  216         }
  217 
  218         return x * 8 + y;
  219 }
  220 
  221 #ifdef COMPAT_FREEBSD32
  222 struct in6_ndifreq32 {
  223         char ifname[IFNAMSIZ];
  224         uint32_t ifindex;
  225 };
  226 #define SIOCGDEFIFACE32_IN6     _IOWR('i', 86, struct in6_ndifreq32)
  227 #endif
  228 
  229 int
  230 in6_control(struct socket *so, u_long cmd, caddr_t data,
  231     struct ifnet *ifp, struct thread *td)
  232 {
  233         struct  in6_ifreq *ifr = (struct in6_ifreq *)data;
  234         struct  in6_ifaddr *ia = NULL;
  235         struct  in6_aliasreq *ifra = (struct in6_aliasreq *)data;
  236         struct sockaddr_in6 *sa6;
  237         int carp_attached = 0;
  238         int error;
  239         u_long ocmd = cmd;
  240 
  241         /*
  242          * Compat to make pre-10.x ifconfig(8) operable.
  243          */
  244         if (cmd == OSIOCAIFADDR_IN6)
  245                 cmd = SIOCAIFADDR_IN6;
  246 
  247         switch (cmd) {
  248         case SIOCGETSGCNT_IN6:
  249         case SIOCGETMIFCNT_IN6:
  250                 /*
  251                  * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c.
  252                  * We cannot see how that would be needed, so do not adjust the
  253                  * KPI blindly; more likely should clean up the IPv4 variant.
  254                  */
  255                 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP);
  256         }
  257 
  258         switch (cmd) {
  259         case SIOCAADDRCTL_POLICY:
  260         case SIOCDADDRCTL_POLICY:
  261                 if (td != NULL) {
  262                         error = priv_check(td, PRIV_NETINET_ADDRCTRL6);
  263                         if (error)
  264                                 return (error);
  265                 }
  266                 return (in6_src_ioctl(cmd, data));
  267         }
  268 
  269         if (ifp == NULL)
  270                 return (EOPNOTSUPP);
  271 
  272         switch (cmd) {
  273         case SIOCSNDFLUSH_IN6:
  274         case SIOCSPFXFLUSH_IN6:
  275         case SIOCSRTRFLUSH_IN6:
  276         case SIOCSDEFIFACE_IN6:
  277         case SIOCSIFINFO_FLAGS:
  278         case SIOCSIFINFO_IN6:
  279                 if (td != NULL) {
  280                         error = priv_check(td, PRIV_NETINET_ND6);
  281                         if (error)
  282                                 return (error);
  283                 }
  284                 /* FALLTHROUGH */
  285         case OSIOCGIFINFO_IN6:
  286         case SIOCGIFINFO_IN6:
  287         case SIOCGNBRINFO_IN6:
  288         case SIOCGDEFIFACE_IN6:
  289                 return (nd6_ioctl(cmd, data, ifp));
  290 
  291 #ifdef COMPAT_FREEBSD32
  292         case SIOCGDEFIFACE32_IN6:
  293                 {
  294                         struct in6_ndifreq ndif;
  295                         struct in6_ndifreq32 *ndif32;
  296 
  297                         error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
  298                             ifp);
  299                         if (error)
  300                                 return (error);
  301                         ndif32 = (struct in6_ndifreq32 *)data;
  302                         ndif32->ifindex = ndif.ifindex;
  303                         return (0);
  304                 }
  305 #endif
  306         }
  307 
  308         switch (cmd) {
  309         case SIOCSIFPREFIX_IN6:
  310         case SIOCDIFPREFIX_IN6:
  311         case SIOCAIFPREFIX_IN6:
  312         case SIOCCIFPREFIX_IN6:
  313         case SIOCSGIFPREFIX_IN6:
  314         case SIOCGIFPREFIX_IN6:
  315                 log(LOG_NOTICE,
  316                     "prefix ioctls are now invalidated. "
  317                     "please use ifconfig.\n");
  318                 return (EOPNOTSUPP);
  319         }
  320 
  321         switch (cmd) {
  322         case SIOCSSCOPE6:
  323                 if (td != NULL) {
  324                         error = priv_check(td, PRIV_NETINET_SCOPE6);
  325                         if (error)
  326                                 return (error);
  327                 }
  328                 /* FALLTHROUGH */
  329         case SIOCGSCOPE6:
  330         case SIOCGSCOPE6DEF:
  331                 return (scope6_ioctl(cmd, data, ifp));
  332         }
  333 
  334         /*
  335          * Find address for this interface, if it exists.
  336          *
  337          * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
  338          * only, and used the first interface address as the target of other
  339          * operations (without checking ifra_addr).  This was because netinet
  340          * code/API assumed at most 1 interface address per interface.
  341          * Since IPv6 allows a node to assign multiple addresses
  342          * on a single interface, we almost always look and check the
  343          * presence of ifra_addr, and reject invalid ones here.
  344          * It also decreases duplicated code among SIOC*_IN6 operations.
  345          */
  346         switch (cmd) {
  347         case SIOCAIFADDR_IN6:
  348         case SIOCSIFPHYADDR_IN6:
  349                 sa6 = &ifra->ifra_addr;
  350                 break;
  351         case SIOCSIFADDR_IN6:
  352         case SIOCGIFADDR_IN6:
  353         case SIOCSIFDSTADDR_IN6:
  354         case SIOCSIFNETMASK_IN6:
  355         case SIOCGIFDSTADDR_IN6:
  356         case SIOCGIFNETMASK_IN6:
  357         case SIOCDIFADDR_IN6:
  358         case SIOCGIFPSRCADDR_IN6:
  359         case SIOCGIFPDSTADDR_IN6:
  360         case SIOCGIFAFLAG_IN6:
  361         case SIOCSNDFLUSH_IN6:
  362         case SIOCSPFXFLUSH_IN6:
  363         case SIOCSRTRFLUSH_IN6:
  364         case SIOCGIFALIFETIME_IN6:
  365         case SIOCGIFSTAT_IN6:
  366         case SIOCGIFSTAT_ICMP6:
  367                 sa6 = &ifr->ifr_addr;
  368                 break;
  369         case SIOCSIFADDR:
  370         case SIOCSIFBRDADDR:
  371         case SIOCSIFDSTADDR:
  372         case SIOCSIFNETMASK:
  373                 /*
  374                  * Although we should pass any non-INET6 ioctl requests
  375                  * down to driver, we filter some legacy INET requests.
  376                  * Drivers trust SIOCSIFADDR et al to come from an already
  377                  * privileged layer, and do not perform any credentials
  378                  * checks or input validation.
  379                  */
  380                 return (EINVAL);
  381         default:
  382                 sa6 = NULL;
  383                 break;
  384         }
  385         if (sa6 && sa6->sin6_family == AF_INET6) {
  386                 if (sa6->sin6_scope_id != 0)
  387                         error = sa6_embedscope(sa6, 0);
  388                 else
  389                         error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
  390                 if (error != 0)
  391                         return (error);
  392                 if (td != NULL && (error = prison_check_ip6(td->td_ucred,
  393                     &sa6->sin6_addr)) != 0)
  394                         return (error);
  395                 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
  396         } else
  397                 ia = NULL;
  398 
  399         switch (cmd) {
  400         case SIOCSIFADDR_IN6:
  401         case SIOCSIFDSTADDR_IN6:
  402         case SIOCSIFNETMASK_IN6:
  403                 /*
  404                  * Since IPv6 allows a node to assign multiple addresses
  405                  * on a single interface, SIOCSIFxxx ioctls are deprecated.
  406                  */
  407                 /* we decided to obsolete this command (20000704) */
  408                 error = EINVAL;
  409                 goto out;
  410 
  411         case SIOCDIFADDR_IN6:
  412                 /*
  413                  * for IPv4, we look for existing in_ifaddr here to allow
  414                  * "ifconfig if0 delete" to remove the first IPv4 address on
  415                  * the interface.  For IPv6, as the spec allows multiple
  416                  * interface address from the day one, we consider "remove the
  417                  * first one" semantics to be not preferable.
  418                  */
  419                 if (ia == NULL) {
  420                         error = EADDRNOTAVAIL;
  421                         goto out;
  422                 }
  423                 /* FALLTHROUGH */
  424         case SIOCAIFADDR_IN6:
  425                 /*
  426                  * We always require users to specify a valid IPv6 address for
  427                  * the corresponding operation.
  428                  */
  429                 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
  430                     ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
  431                         error = EAFNOSUPPORT;
  432                         goto out;
  433                 }
  434 
  435                 if (td != NULL) {
  436                         error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ?
  437                             PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
  438                         if (error)
  439                                 goto out;
  440                 }
  441                 /* FALLTHROUGH */
  442         case SIOCGIFSTAT_IN6:
  443         case SIOCGIFSTAT_ICMP6:
  444                 if (ifp->if_afdata[AF_INET6] == NULL) {
  445                         error = EPFNOSUPPORT;
  446                         goto out;
  447                 }
  448                 break;
  449 
  450         case SIOCGIFADDR_IN6:
  451                 /* This interface is basically deprecated. use SIOCGIFCONF. */
  452                 /* FALLTHROUGH */
  453         case SIOCGIFAFLAG_IN6:
  454         case SIOCGIFNETMASK_IN6:
  455         case SIOCGIFDSTADDR_IN6:
  456         case SIOCGIFALIFETIME_IN6:
  457                 /* must think again about its semantics */
  458                 if (ia == NULL) {
  459                         error = EADDRNOTAVAIL;
  460                         goto out;
  461                 }
  462                 break;
  463         }
  464 
  465         switch (cmd) {
  466         case SIOCGIFADDR_IN6:
  467                 ifr->ifr_addr = ia->ia_addr;
  468                 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
  469                         goto out;
  470                 break;
  471 
  472         case SIOCGIFDSTADDR_IN6:
  473                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
  474                         error = EINVAL;
  475                         goto out;
  476                 }
  477                 /*
  478                  * XXX: should we check if ifa_dstaddr is NULL and return
  479                  * an error?
  480                  */
  481                 ifr->ifr_dstaddr = ia->ia_dstaddr;
  482                 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
  483                         goto out;
  484                 break;
  485 
  486         case SIOCGIFNETMASK_IN6:
  487                 ifr->ifr_addr = ia->ia_prefixmask;
  488                 break;
  489 
  490         case SIOCGIFAFLAG_IN6:
  491                 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
  492                 break;
  493 
  494         case SIOCGIFSTAT_IN6:
  495                 COUNTER_ARRAY_COPY(((struct in6_ifextra *)
  496                     ifp->if_afdata[AF_INET6])->in6_ifstat,
  497                     &ifr->ifr_ifru.ifru_stat,
  498                     sizeof(struct in6_ifstat) / sizeof(uint64_t));
  499                 break;
  500 
  501         case SIOCGIFSTAT_ICMP6:
  502                 COUNTER_ARRAY_COPY(((struct in6_ifextra *)
  503                     ifp->if_afdata[AF_INET6])->icmp6_ifstat,
  504                     &ifr->ifr_ifru.ifru_icmp6stat,
  505                     sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
  506                 break;
  507 
  508         case SIOCGIFALIFETIME_IN6:
  509                 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
  510                 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
  511                         time_t maxexpire;
  512                         struct in6_addrlifetime *retlt =
  513                             &ifr->ifr_ifru.ifru_lifetime;
  514 
  515                         /*
  516                          * XXX: adjust expiration time assuming time_t is
  517                          * signed.
  518                          */
  519                         maxexpire = (-1) &
  520                             ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
  521                         if (ia->ia6_lifetime.ia6t_vltime <
  522                             maxexpire - ia->ia6_updatetime) {
  523                                 retlt->ia6t_expire = ia->ia6_updatetime +
  524                                     ia->ia6_lifetime.ia6t_vltime;
  525                         } else
  526                                 retlt->ia6t_expire = maxexpire;
  527                 }
  528                 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
  529                         time_t maxexpire;
  530                         struct in6_addrlifetime *retlt =
  531                             &ifr->ifr_ifru.ifru_lifetime;
  532 
  533                         /*
  534                          * XXX: adjust expiration time assuming time_t is
  535                          * signed.
  536                          */
  537                         maxexpire = (-1) &
  538                             ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
  539                         if (ia->ia6_lifetime.ia6t_pltime <
  540                             maxexpire - ia->ia6_updatetime) {
  541                                 retlt->ia6t_preferred = ia->ia6_updatetime +
  542                                     ia->ia6_lifetime.ia6t_pltime;
  543                         } else
  544                                 retlt->ia6t_preferred = maxexpire;
  545                 }
  546                 break;
  547 
  548         case SIOCAIFADDR_IN6:
  549         {
  550                 struct nd_prefixctl pr0;
  551                 struct nd_prefix *pr;
  552 
  553                 /*
  554                  * first, make or update the interface address structure,
  555                  * and link it to the list.
  556                  */
  557                 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
  558                         goto out;
  559                 if (ia != NULL)
  560                         ifa_free(&ia->ia_ifa);
  561                 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
  562                     == NULL) {
  563                         /*
  564                          * this can happen when the user specify the 0 valid
  565                          * lifetime.
  566                          */
  567                         break;
  568                 }
  569 
  570                 if (cmd == ocmd && ifra->ifra_vhid > 0) {
  571                         if (carp_attach_p != NULL)
  572                                 error = (*carp_attach_p)(&ia->ia_ifa,
  573                                     ifra->ifra_vhid);
  574                         else
  575                                 error = EPROTONOSUPPORT;
  576                         if (error)
  577                                 goto out;
  578                         else
  579                                 carp_attached = 1;
  580                 }
  581 
  582                 /*
  583                  * then, make the prefix on-link on the interface.
  584                  * XXX: we'd rather create the prefix before the address, but
  585                  * we need at least one address to install the corresponding
  586                  * interface route, so we configure the address first.
  587                  */
  588 
  589                 /*
  590                  * convert mask to prefix length (prefixmask has already
  591                  * been validated in in6_update_ifa().
  592                  */
  593                 bzero(&pr0, sizeof(pr0));
  594                 pr0.ndpr_ifp = ifp;
  595                 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
  596                     NULL);
  597                 if (pr0.ndpr_plen == 128) {
  598                         /* we don't need to install a host route. */
  599                         goto aifaddr_out;
  600                 }
  601                 pr0.ndpr_prefix = ifra->ifra_addr;
  602                 /* apply the mask for safety. */
  603                 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr,
  604                     &ifra->ifra_prefixmask.sin6_addr);
  605 
  606                 /*
  607                  * XXX: since we don't have an API to set prefix (not address)
  608                  * lifetimes, we just use the same lifetimes as addresses.
  609                  * The (temporarily) installed lifetimes can be overridden by
  610                  * later advertised RAs (when accept_rtadv is non 0), which is
  611                  * an intended behavior.
  612                  */
  613                 pr0.ndpr_raf_onlink = 1; /* should be configurable? */
  614                 pr0.ndpr_raf_auto =
  615                     ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
  616                 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
  617                 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
  618 
  619                 /* add the prefix if not yet. */
  620                 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
  621                         /*
  622                          * nd6_prelist_add will install the corresponding
  623                          * interface route.
  624                          */
  625                         if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) {
  626                                 if (carp_attached)
  627                                         (*carp_detach_p)(&ia->ia_ifa);
  628                                 goto out;
  629                         }
  630                 }
  631 
  632                 /* relate the address to the prefix */
  633                 if (ia->ia6_ndpr == NULL) {
  634                         ia->ia6_ndpr = pr;
  635                         pr->ndpr_addrcnt++;
  636 
  637                         /*
  638                          * If this is the first autoconf address from the
  639                          * prefix, create a temporary address as well
  640                          * (when required).
  641                          */
  642                         if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
  643                             V_ip6_use_tempaddr && pr->ndpr_addrcnt == 1) {
  644                                 int e;
  645                                 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
  646                                         log(LOG_NOTICE, "in6_control: failed "
  647                                             "to create a temporary address, "
  648                                             "errno=%d\n", e);
  649                                 }
  650                         }
  651                 }
  652                 nd6_prefix_rele(pr);
  653 
  654                 /*
  655                  * this might affect the status of autoconfigured addresses,
  656                  * that is, this address might make other addresses detached.
  657                  */
  658                 pfxlist_onlink_check();
  659 
  660 aifaddr_out:
  661                 /*
  662                  * Try to clear the flag when a new IPv6 address is added
  663                  * onto an IFDISABLED interface and it succeeds.
  664                  */
  665                 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
  666                         struct in6_ndireq nd;
  667 
  668                         memset(&nd, 0, sizeof(nd));
  669                         nd.ndi.flags = ND_IFINFO(ifp)->flags;
  670                         nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
  671                         if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0)
  672                                 log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
  673                                     "SIOCSIFINFO_FLAGS for -ifdisabled "
  674                                     "failed.");
  675                         /*
  676                          * Ignore failure of clearing the flag intentionally.
  677                          * The failure means address duplication was detected.
  678                          */
  679                 }
  680                 break;
  681         }
  682 
  683         case SIOCDIFADDR_IN6:
  684         {
  685                 struct nd_prefix *pr;
  686 
  687                 /*
  688                  * If the address being deleted is the only one that owns
  689                  * the corresponding prefix, expire the prefix as well.
  690                  * XXX: theoretically, we don't have to worry about such
  691                  * relationship, since we separate the address management
  692                  * and the prefix management.  We do this, however, to provide
  693                  * as much backward compatibility as possible in terms of
  694                  * the ioctl operation.
  695                  * Note that in6_purgeaddr() will decrement ndpr_addrcnt.
  696                  */
  697                 pr = ia->ia6_ndpr;
  698                 in6_purgeaddr(&ia->ia_ifa);
  699                 if (pr != NULL && pr->ndpr_addrcnt == 0) {
  700                         ND6_WLOCK();
  701                         nd6_prefix_unlink(pr, NULL);
  702                         ND6_WUNLOCK();
  703                         nd6_prefix_del(pr);
  704                 }
  705                 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
  706                 break;
  707         }
  708 
  709         default:
  710                 if (ifp->if_ioctl == NULL) {
  711                         error = EOPNOTSUPP;
  712                         goto out;
  713                 }
  714                 error = (*ifp->if_ioctl)(ifp, cmd, data);
  715                 goto out;
  716         }
  717 
  718         error = 0;
  719 out:
  720         if (ia != NULL)
  721                 ifa_free(&ia->ia_ifa);
  722         return (error);
  723 }
  724 
  725 
  726 /*
  727  * Join necessary multicast groups.  Factored out from in6_update_ifa().
  728  * This entire work should only be done once, for the default FIB.
  729  */
  730 static int
  731 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra,
  732     struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol)
  733 {
  734         char ip6buf[INET6_ADDRSTRLEN];
  735         struct in6_addr mltaddr;
  736         struct in6_multi_mship *imm;
  737         int delay, error;
  738 
  739         KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__));
  740 
  741         /* Join solicited multicast addr for new host id. */
  742         bzero(&mltaddr, sizeof(struct in6_addr));
  743         mltaddr.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
  744         mltaddr.s6_addr32[2] = htonl(1);
  745         mltaddr.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
  746         mltaddr.s6_addr8[12] = 0xff;
  747         if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) {
  748                 /* XXX: should not happen */
  749                 log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
  750                 goto cleanup;
  751         }
  752         delay = error = 0;
  753         if ((flags & IN6_IFAUPDATE_DADDELAY)) {
  754                 /*
  755                  * We need a random delay for DAD on the address being
  756                  * configured.  It also means delaying transmission of the
  757                  * corresponding MLD report to avoid report collision.
  758                  * [RFC 4861, Section 6.3.7]
  759                  */
  760                 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
  761         }
  762         imm = in6_joingroup(ifp, &mltaddr, &error, delay);
  763         if (imm == NULL) {
  764                 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
  765                     "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
  766                     if_name(ifp), error));
  767                 goto cleanup;
  768         }
  769         LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
  770         *in6m_sol = imm->i6mm_maddr;
  771 
  772         /*
  773          * Join link-local all-nodes address.
  774          */
  775         mltaddr = in6addr_linklocal_allnodes;
  776         if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
  777                 goto cleanup; /* XXX: should not fail */
  778 
  779         imm = in6_joingroup(ifp, &mltaddr, &error, 0);
  780         if (imm == NULL) {
  781                 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
  782                     "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
  783                     if_name(ifp), error));
  784                 goto cleanup;
  785         }
  786         LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
  787 
  788         /*
  789          * Join node information group address.
  790          */
  791         delay = 0;
  792         if ((flags & IN6_IFAUPDATE_DADDELAY)) {
  793                 /*
  794                  * The spec does not say anything about delay for this group,
  795                  * but the same logic should apply.
  796                  */
  797                 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
  798         }
  799         if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) {
  800                 /* XXX jinmei */
  801                 imm = in6_joingroup(ifp, &mltaddr, &error, delay);
  802                 if (imm == NULL)
  803                         nd6log((LOG_WARNING,
  804                             "%s: in6_joingroup failed for %s on %s "
  805                             "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
  806                             &mltaddr), if_name(ifp), error));
  807                         /* XXX not very fatal, go on... */
  808                 else
  809                         LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
  810         }
  811         if (V_icmp6_nodeinfo_oldmcprefix &&
  812             in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) {
  813                 imm = in6_joingroup(ifp, &mltaddr, &error, delay);
  814                 if (imm == NULL)
  815                         nd6log((LOG_WARNING,
  816                             "%s: in6_joingroup failed for %s on %s "
  817                             "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
  818                             &mltaddr), if_name(ifp), error));
  819                         /* XXX not very fatal, go on... */
  820                 else
  821                         LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
  822         }
  823 
  824         /*
  825          * Join interface-local all-nodes address.
  826          * (ff01::1%ifN, and ff01::%ifN/32)
  827          */
  828         mltaddr = in6addr_nodelocal_allnodes;
  829         if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
  830                 goto cleanup; /* XXX: should not fail */
  831 
  832         imm = in6_joingroup(ifp, &mltaddr, &error, 0);
  833         if (imm == NULL) {
  834                 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
  835                     "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
  836                     &mltaddr), if_name(ifp), error));
  837                 goto cleanup;
  838         }
  839         LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
  840 
  841 cleanup:
  842         return (error);
  843 }
  844 
  845 /*
  846  * Update parameters of an IPv6 interface address.
  847  * If necessary, a new entry is created and linked into address chains.
  848  * This function is separated from in6_control().
  849  */
  850 int
  851 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
  852     struct in6_ifaddr *ia, int flags)
  853 {
  854         int error, hostIsNew = 0;
  855 
  856         if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0)
  857                 return (error);
  858 
  859         if (ia == NULL) {
  860                 hostIsNew = 1;
  861                 if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL)
  862                         return (ENOBUFS);
  863         }
  864 
  865         error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags);
  866         if (error != 0) {
  867                 if (hostIsNew != 0) {
  868                         in6_unlink_ifa(ia, ifp);
  869                         ifa_free(&ia->ia_ifa);
  870                 }
  871                 return (error);
  872         }
  873 
  874         if (hostIsNew)
  875                 error = in6_broadcast_ifa(ifp, ifra, ia, flags);
  876 
  877         return (error);
  878 }
  879 
  880 /*
  881  * Fill in basic IPv6 address request info.
  882  */
  883 void
  884 in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr,
  885     const struct in6_addr *mask)
  886 {
  887 
  888         memset(ifra, 0, sizeof(struct in6_aliasreq));
  889 
  890         ifra->ifra_addr.sin6_family = AF_INET6;
  891         ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
  892         if (addr != NULL)
  893                 ifra->ifra_addr.sin6_addr = *addr;
  894 
  895         ifra->ifra_prefixmask.sin6_family = AF_INET6;
  896         ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
  897         if (mask != NULL)
  898                 ifra->ifra_prefixmask.sin6_addr = *mask;
  899 }
  900 
  901 static int
  902 in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra,
  903     struct in6_ifaddr *ia, int flags)
  904 {
  905         int plen = -1;
  906         struct sockaddr_in6 dst6;
  907         struct in6_addrlifetime *lt;
  908         char ip6buf[INET6_ADDRSTRLEN];
  909 
  910         /* Validate parameters */
  911         if (ifp == NULL || ifra == NULL) /* this maybe redundant */
  912                 return (EINVAL);
  913 
  914         /*
  915          * The destination address for a p2p link must have a family
  916          * of AF_UNSPEC or AF_INET6.
  917          */
  918         if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
  919             ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
  920             ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
  921                 return (EAFNOSUPPORT);
  922 
  923         /*
  924          * Validate address
  925          */
  926         if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) ||
  927             ifra->ifra_addr.sin6_family != AF_INET6)
  928                 return (EINVAL);
  929 
  930         /*
  931          * validate ifra_prefixmask.  don't check sin6_family, netmask
  932          * does not carry fields other than sin6_len.
  933          */
  934         if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
  935                 return (EINVAL);
  936         /*
  937          * Because the IPv6 address architecture is classless, we require
  938          * users to specify a (non 0) prefix length (mask) for a new address.
  939          * We also require the prefix (when specified) mask is valid, and thus
  940          * reject a non-consecutive mask.
  941          */
  942         if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
  943                 return (EINVAL);
  944         if (ifra->ifra_prefixmask.sin6_len != 0) {
  945                 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
  946                     (u_char *)&ifra->ifra_prefixmask +
  947                     ifra->ifra_prefixmask.sin6_len);
  948                 if (plen <= 0)
  949                         return (EINVAL);
  950         } else {
  951                 /*
  952                  * In this case, ia must not be NULL.  We just use its prefix
  953                  * length.
  954                  */
  955                 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
  956         }
  957         /*
  958          * If the destination address on a p2p interface is specified,
  959          * and the address is a scoped one, validate/set the scope
  960          * zone identifier.
  961          */
  962         dst6 = ifra->ifra_dstaddr;
  963         if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
  964             (dst6.sin6_family == AF_INET6)) {
  965                 struct in6_addr in6_tmp;
  966                 u_int32_t zoneid;
  967 
  968                 in6_tmp = dst6.sin6_addr;
  969                 if (in6_setscope(&in6_tmp, ifp, &zoneid))
  970                         return (EINVAL); /* XXX: should be impossible */
  971 
  972                 if (dst6.sin6_scope_id != 0) {
  973                         if (dst6.sin6_scope_id != zoneid)
  974                                 return (EINVAL);
  975                 } else          /* user omit to specify the ID. */
  976                         dst6.sin6_scope_id = zoneid;
  977 
  978                 /* convert into the internal form */
  979                 if (sa6_embedscope(&dst6, 0))
  980                         return (EINVAL); /* XXX: should be impossible */
  981         }
  982         /* Modify original ifra_dstaddr to reflect changes */
  983         ifra->ifra_dstaddr = dst6;
  984 
  985         /*
  986          * The destination address can be specified only for a p2p or a
  987          * loopback interface.  If specified, the corresponding prefix length
  988          * must be 128.
  989          */
  990         if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
  991                 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
  992                         /* XXX: noisy message */
  993                         nd6log((LOG_INFO, "in6_update_ifa: a destination can "
  994                             "be specified for a p2p or a loopback IF only\n"));
  995                         return (EINVAL);
  996                 }
  997                 if (plen != 128) {
  998                         nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
  999                             "be 128 when dstaddr is specified\n"));
 1000                         return (EINVAL);
 1001                 }
 1002         }
 1003         /* lifetime consistency check */
 1004         lt = &ifra->ifra_lifetime;
 1005         if (lt->ia6t_pltime > lt->ia6t_vltime)
 1006                 return (EINVAL);
 1007         if (lt->ia6t_vltime == 0) {
 1008                 /*
 1009                  * the following log might be noisy, but this is a typical
 1010                  * configuration mistake or a tool's bug.
 1011                  */
 1012                 nd6log((LOG_INFO,
 1013                     "in6_update_ifa: valid lifetime is 0 for %s\n",
 1014                     ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
 1015 
 1016                 if (ia == NULL)
 1017                         return (0); /* there's nothing to do */
 1018         }
 1019 
 1020         /* Check prefix mask */
 1021         if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) {
 1022                 /*
 1023                  * We prohibit changing the prefix length of an existing
 1024                  * address, because
 1025                  * + such an operation should be rare in IPv6, and
 1026                  * + the operation would confuse prefix management.
 1027                  */
 1028                 if (ia->ia_prefixmask.sin6_len != 0 &&
 1029                     in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
 1030                         nd6log((LOG_INFO, "in6_validate_ifa: the prefix length "
 1031                             "of an existing %s address should not be changed\n",
 1032                             ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
 1033 
 1034                         return (EINVAL);
 1035                 }
 1036         }
 1037 
 1038         return (0);
 1039 }
 1040 
 1041 
 1042 /*
 1043  * Allocate a new ifaddr and link it into chains.
 1044  */
 1045 static struct in6_ifaddr *
 1046 in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags)
 1047 {
 1048         struct in6_ifaddr *ia;
 1049 
 1050         /*
 1051          * When in6_alloc_ifa() is called in a process of a received
 1052          * RA, it is called under an interrupt context.  So, we should
 1053          * call malloc with M_NOWAIT.
 1054          */
 1055         ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT);
 1056         if (ia == NULL)
 1057                 return (NULL);
 1058         LIST_INIT(&ia->ia6_memberships);
 1059         /* Initialize the address and masks, and put time stamp */
 1060         ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
 1061         ia->ia_addr.sin6_family = AF_INET6;
 1062         ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
 1063         /* XXX: Can we assign ,sin6_addr and skip the rest? */
 1064         ia->ia_addr = ifra->ifra_addr;
 1065         ia->ia6_createtime = time_uptime;
 1066         if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
 1067                 /*
 1068                  * Some functions expect that ifa_dstaddr is not
 1069                  * NULL for p2p interfaces.
 1070                  */
 1071                 ia->ia_ifa.ifa_dstaddr =
 1072                     (struct sockaddr *)&ia->ia_dstaddr;
 1073         } else {
 1074                 ia->ia_ifa.ifa_dstaddr = NULL;
 1075         }
 1076 
 1077         /* set prefix mask if any */
 1078         ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
 1079         if (ifra->ifra_prefixmask.sin6_len != 0) {
 1080                 ia->ia_prefixmask.sin6_family = AF_INET6;
 1081                 ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len;
 1082                 ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr;
 1083         }
 1084 
 1085         ia->ia_ifp = ifp;
 1086         ifa_ref(&ia->ia_ifa);                   /* if_addrhead */
 1087         IF_ADDR_WLOCK(ifp);
 1088         TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
 1089         IF_ADDR_WUNLOCK(ifp);
 1090 
 1091         ifa_ref(&ia->ia_ifa);                   /* in6_ifaddrhead */
 1092         IN6_IFADDR_WLOCK();
 1093         TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
 1094         LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash);
 1095         IN6_IFADDR_WUNLOCK();
 1096 
 1097         return (ia);
 1098 }
 1099 
 1100 /*
 1101  * Update/configure interface address parameters:
 1102  *
 1103  * 1) Update lifetime
 1104  * 2) Update interface metric ad flags
 1105  * 3) Notify other subsystems
 1106  */
 1107 static int
 1108 in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra,
 1109     struct in6_ifaddr *ia, int hostIsNew, int flags)
 1110 {
 1111         int error;
 1112 
 1113         /* update timestamp */
 1114         ia->ia6_updatetime = time_uptime;
 1115 
 1116         /*
 1117          * Set lifetimes.  We do not refer to ia6t_expire and ia6t_preferred
 1118          * to see if the address is deprecated or invalidated, but initialize
 1119          * these members for applications.
 1120          */
 1121         ia->ia6_lifetime = ifra->ifra_lifetime;
 1122         if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
 1123                 ia->ia6_lifetime.ia6t_expire =
 1124                     time_uptime + ia->ia6_lifetime.ia6t_vltime;
 1125         } else
 1126                 ia->ia6_lifetime.ia6t_expire = 0;
 1127         if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
 1128                 ia->ia6_lifetime.ia6t_preferred =
 1129                     time_uptime + ia->ia6_lifetime.ia6t_pltime;
 1130         } else
 1131                 ia->ia6_lifetime.ia6t_preferred = 0;
 1132 
 1133         /*
 1134          * backward compatibility - if IN6_IFF_DEPRECATED is set from the
 1135          * userland, make it deprecated.
 1136          */
 1137         if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
 1138                 ia->ia6_lifetime.ia6t_pltime = 0;
 1139                 ia->ia6_lifetime.ia6t_preferred = time_uptime;
 1140         }
 1141 
 1142         /*
 1143          * configure address flags.
 1144          */
 1145         ia->ia6_flags = ifra->ifra_flags;
 1146 
 1147         /*
 1148          * Make the address tentative before joining multicast addresses,
 1149          * so that corresponding MLD responses would not have a tentative
 1150          * source address.
 1151          */
 1152         ia->ia6_flags &= ~IN6_IFF_DUPLICATED;   /* safety */
 1153 
 1154         /*
 1155          * DAD should be performed for an new address or addresses on
 1156          * an interface with ND6_IFF_IFDISABLED.
 1157          */
 1158         if (in6if_do_dad(ifp) &&
 1159             (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)))
 1160                 ia->ia6_flags |= IN6_IFF_TENTATIVE;
 1161 
 1162         /* notify other subsystems */
 1163         error = in6_notify_ifa(ifp, ia, ifra, hostIsNew);
 1164 
 1165         return (error);
 1166 }
 1167 
 1168 /*
 1169  * Do link-level ifa job:
 1170  * 1) Add lle entry for added address
 1171  * 2) Notifies routing socket users about new address
 1172  * 3) join appropriate multicast group
 1173  * 4) start DAD if enabled
 1174  */
 1175 static int
 1176 in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
 1177     struct in6_ifaddr *ia, int flags)
 1178 {
 1179         struct in6_multi *in6m_sol;
 1180         int error = 0;
 1181 
 1182         /* Add local address to lltable, if necessary (ex. on p2p link). */
 1183         if ((error = nd6_add_ifa_lle(ia)) != 0) {
 1184                 in6_purgeaddr(&ia->ia_ifa);
 1185                 ifa_free(&ia->ia_ifa);
 1186                 return (error);
 1187         }
 1188 
 1189         /* Join necessary multicast groups. */
 1190         in6m_sol = NULL;
 1191         if ((ifp->if_flags & IFF_MULTICAST) != 0) {
 1192                 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol);
 1193                 if (error != 0) {
 1194                         in6_purgeaddr(&ia->ia_ifa);
 1195                         ifa_free(&ia->ia_ifa);
 1196                         return (error);
 1197                 }
 1198         }
 1199 
 1200         /* Perform DAD, if the address is TENTATIVE. */
 1201         if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) {
 1202                 int delay, mindelay, maxdelay;
 1203 
 1204                 delay = 0;
 1205                 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
 1206                         /*
 1207                          * We need to impose a delay before sending an NS
 1208                          * for DAD.  Check if we also needed a delay for the
 1209                          * corresponding MLD message.  If we did, the delay
 1210                          * should be larger than the MLD delay (this could be
 1211                          * relaxed a bit, but this simple logic is at least
 1212                          * safe).
 1213                          * XXX: Break data hiding guidelines and look at
 1214                          * state for the solicited multicast group.
 1215                          */
 1216                         mindelay = 0;
 1217                         if (in6m_sol != NULL &&
 1218                             in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
 1219                                 mindelay = in6m_sol->in6m_timer;
 1220                         }
 1221                         maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
 1222                         if (maxdelay - mindelay == 0)
 1223                                 delay = 0;
 1224                         else {
 1225                                 delay =
 1226                                     (arc4random() % (maxdelay - mindelay)) +
 1227                                     mindelay;
 1228                         }
 1229                 }
 1230                 nd6_dad_start((struct ifaddr *)ia, delay);
 1231         }
 1232 
 1233         in6_newaddrmsg(ia, RTM_ADD);
 1234         ifa_free(&ia->ia_ifa);
 1235         return (error);
 1236 }
 1237 
 1238 void
 1239 in6_purgeaddr(struct ifaddr *ifa)
 1240 {
 1241         struct ifnet *ifp = ifa->ifa_ifp;
 1242         struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
 1243         struct in6_multi_mship *imm;
 1244         int plen, error;
 1245 
 1246         if (ifa->ifa_carp)
 1247                 (*carp_detach_p)(ifa);
 1248 
 1249         /*
 1250          * Remove the loopback route to the interface address.
 1251          * The check for the current setting of "nd6_useloopback"
 1252          * is not needed.
 1253          */
 1254         if (ia->ia_flags & IFA_RTSELF) {
 1255                 error = ifa_del_loopback_route((struct ifaddr *)ia,
 1256                     (struct sockaddr *)&ia->ia_addr);
 1257                 if (error == 0)
 1258                         ia->ia_flags &= ~IFA_RTSELF;
 1259         }
 1260 
 1261         /* stop DAD processing */
 1262         nd6_dad_stop(ifa);
 1263 
 1264         /* Leave multicast groups. */
 1265         while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
 1266                 LIST_REMOVE(imm, i6mm_chain);
 1267                 in6_leavegroup(imm);
 1268         }
 1269         plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
 1270         if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
 1271                 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags |
 1272                     (ia->ia_dstaddr.sin6_family == AF_INET6 ? RTF_HOST : 0));
 1273                 if (error != 0)
 1274                         log(LOG_INFO, "%s: err=%d, destination address delete "
 1275                             "failed\n", __func__, error);
 1276                 ia->ia_flags &= ~IFA_ROUTE;
 1277         }
 1278 
 1279         in6_newaddrmsg(ia, RTM_DELETE);
 1280         in6_unlink_ifa(ia, ifp);
 1281 }
 1282 
 1283 static void
 1284 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
 1285 {
 1286         char ip6buf[INET6_ADDRSTRLEN];
 1287         int remove_lle;
 1288 
 1289         IF_ADDR_WLOCK(ifp);
 1290         TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
 1291         IF_ADDR_WUNLOCK(ifp);
 1292         ifa_free(&ia->ia_ifa);                  /* if_addrhead */
 1293 
 1294         /*
 1295          * Defer the release of what might be the last reference to the
 1296          * in6_ifaddr so that it can't be freed before the remainder of the
 1297          * cleanup.
 1298          */
 1299         IN6_IFADDR_WLOCK();
 1300         TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
 1301         LIST_REMOVE(ia, ia6_hash);
 1302         IN6_IFADDR_WUNLOCK();
 1303 
 1304         /*
 1305          * Release the reference to the base prefix.  There should be a
 1306          * positive reference.
 1307          */
 1308         remove_lle = 0;
 1309         if (ia->ia6_ndpr == NULL) {
 1310                 nd6log((LOG_NOTICE,
 1311                     "in6_unlink_ifa: autoconf'ed address "
 1312                     "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia))));
 1313         } else {
 1314                 ia->ia6_ndpr->ndpr_addrcnt--;
 1315                 /* Do not delete lles within prefix if refcont != 0 */
 1316                 if (ia->ia6_ndpr->ndpr_addrcnt == 0)
 1317                         remove_lle = 1;
 1318                 ia->ia6_ndpr = NULL;
 1319         }
 1320 
 1321         nd6_rem_ifa_lle(ia, remove_lle);
 1322 
 1323         /*
 1324          * Also, if the address being removed is autoconf'ed, call
 1325          * pfxlist_onlink_check() since the release might affect the status of
 1326          * other (detached) addresses.
 1327          */
 1328         if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
 1329                 pfxlist_onlink_check();
 1330         }
 1331         ifa_free(&ia->ia_ifa);                  /* in6_ifaddrhead */
 1332 }
 1333 
 1334 /*
 1335  * Notifies other subsystems about address change/arrival:
 1336  * 1) Notifies device handler on the first IPv6 address assignment
 1337  * 2) Handle routing table changes for P2P links and route
 1338  * 3) Handle routing table changes for address host route
 1339  */
 1340 static int
 1341 in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia,
 1342     struct in6_aliasreq *ifra, int hostIsNew)
 1343 {
 1344         int     error = 0, plen, ifacount = 0;
 1345         struct ifaddr *ifa;
 1346         struct sockaddr_in6 *pdst;
 1347         char ip6buf[INET6_ADDRSTRLEN];
 1348 
 1349         /*
 1350          * Give the interface a chance to initialize
 1351          * if this is its first address,
 1352          */
 1353         if (hostIsNew != 0) {
 1354                 IF_ADDR_RLOCK(ifp);
 1355                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1356                         if (ifa->ifa_addr->sa_family != AF_INET6)
 1357                                 continue;
 1358                         ifacount++;
 1359                 }
 1360                 IF_ADDR_RUNLOCK(ifp);
 1361         }
 1362 
 1363         if (ifacount <= 1 && ifp->if_ioctl) {
 1364                 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
 1365                 if (error)
 1366                         goto done;
 1367         }
 1368 
 1369         /*
 1370          * If a new destination address is specified, scrub the old one and
 1371          * install the new destination.  Note that the interface must be
 1372          * p2p or loopback.
 1373          */
 1374         pdst = &ifra->ifra_dstaddr;
 1375         if (pdst->sin6_family == AF_INET6 &&
 1376             !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
 1377                 if ((ia->ia_flags & IFA_ROUTE) != 0 &&
 1378                     (rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0)) {
 1379                         nd6log((LOG_ERR, "in6_update_ifa_internal: failed to "
 1380                             "remove a route to the old destination: %s\n",
 1381                             ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
 1382                         /* proceed anyway... */
 1383                 } else
 1384                         ia->ia_flags &= ~IFA_ROUTE;
 1385                 ia->ia_dstaddr = *pdst;
 1386         }
 1387 
 1388         /*
 1389          * If a new destination address is specified for a point-to-point
 1390          * interface, install a route to the destination as an interface
 1391          * direct route.
 1392          * XXX: the logic below rejects assigning multiple addresses on a p2p
 1393          * interface that share the same destination.
 1394          */
 1395         plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
 1396         if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
 1397             ia->ia_dstaddr.sin6_family == AF_INET6) {
 1398                 int rtflags = RTF_UP | RTF_HOST;
 1399                 /*
 1400                  * Handle the case for ::1 .
 1401                  */
 1402                 if (ifp->if_flags & IFF_LOOPBACK)
 1403                         ia->ia_flags |= IFA_RTSELF;
 1404                 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags);
 1405                 if (error)
 1406                         goto done;
 1407                 ia->ia_flags |= IFA_ROUTE;
 1408         }
 1409 
 1410         /*
 1411          * add a loopback route to self if not exists
 1412          */
 1413         if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
 1414                 error = ifa_add_loopback_route((struct ifaddr *)ia,
 1415                     (struct sockaddr *)&ia->ia_addr);
 1416                 if (error == 0)
 1417                         ia->ia_flags |= IFA_RTSELF;
 1418         }
 1419 done:
 1420         WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
 1421             "Invoking IPv6 network device address event may sleep");
 1422 
 1423         EVENTHANDLER_INVOKE(ifaddr_event, ifp);
 1424 
 1425         return (error);
 1426 }
 1427 
 1428 /*
 1429  * Find an IPv6 interface link-local address specific to an interface.
 1430  * ifaddr is returned referenced.
 1431  */
 1432 struct in6_ifaddr *
 1433 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
 1434 {
 1435         struct ifaddr *ifa;
 1436 
 1437         IF_ADDR_RLOCK(ifp);
 1438         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1439                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1440                         continue;
 1441                 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
 1442                         if ((((struct in6_ifaddr *)ifa)->ia6_flags &
 1443                             ignoreflags) != 0)
 1444                                 continue;
 1445                         ifa_ref(ifa);
 1446                         break;
 1447                 }
 1448         }
 1449         IF_ADDR_RUNLOCK(ifp);
 1450 
 1451         return ((struct in6_ifaddr *)ifa);
 1452 }
 1453 
 1454 
 1455 /*
 1456  * find the interface address corresponding to a given IPv6 address.
 1457  * ifaddr is returned referenced.
 1458  */
 1459 struct in6_ifaddr *
 1460 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid)
 1461 {
 1462         struct rm_priotracker in6_ifa_tracker;
 1463         struct in6_ifaddr *ia;
 1464 
 1465         IN6_IFADDR_RLOCK(&in6_ifa_tracker);
 1466         LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) {
 1467                 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) {
 1468                         if (zoneid != 0 &&
 1469                             zoneid != ia->ia_addr.sin6_scope_id)
 1470                                 continue;
 1471                         ifa_ref(&ia->ia_ifa);
 1472                         break;
 1473                 }
 1474         }
 1475         IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
 1476         return (ia);
 1477 }
 1478 
 1479 /*
 1480  * find the internet address corresponding to a given interface and address.
 1481  * ifaddr is returned referenced.
 1482  */
 1483 struct in6_ifaddr *
 1484 in6ifa_ifpwithaddr(struct ifnet *ifp, const struct in6_addr *addr)
 1485 {
 1486         struct ifaddr *ifa;
 1487 
 1488         IF_ADDR_RLOCK(ifp);
 1489         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1490                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1491                         continue;
 1492                 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
 1493                         ifa_ref(ifa);
 1494                         break;
 1495                 }
 1496         }
 1497         IF_ADDR_RUNLOCK(ifp);
 1498 
 1499         return ((struct in6_ifaddr *)ifa);
 1500 }
 1501 
 1502 /*
 1503  * Find a link-local scoped address on ifp and return it if any.
 1504  */
 1505 struct in6_ifaddr *
 1506 in6ifa_llaonifp(struct ifnet *ifp)
 1507 {
 1508         struct sockaddr_in6 *sin6;
 1509         struct ifaddr *ifa;
 1510 
 1511         if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
 1512                 return (NULL);
 1513         IF_ADDR_RLOCK(ifp);
 1514         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1515                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1516                         continue;
 1517                 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
 1518                 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
 1519                     IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) ||
 1520                     IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr))
 1521                         break;
 1522         }
 1523         IF_ADDR_RUNLOCK(ifp);
 1524 
 1525         return ((struct in6_ifaddr *)ifa);
 1526 }
 1527 
 1528 /*
 1529  * Convert IP6 address to printable (loggable) representation. Caller
 1530  * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
 1531  */
 1532 static char digits[] = "0123456789abcdef";
 1533 char *
 1534 ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
 1535 {
 1536         int i, cnt = 0, maxcnt = 0, idx = 0, index = 0;
 1537         char *cp;
 1538         const u_int16_t *a = (const u_int16_t *)addr;
 1539         const u_int8_t *d;
 1540         int dcolon = 0, zero = 0;
 1541 
 1542         cp = ip6buf;
 1543 
 1544         for (i = 0; i < 8; i++) {
 1545                 if (*(a + i) == 0) {
 1546                         cnt++;
 1547                         if (cnt == 1)
 1548                                 idx = i;
 1549                 }
 1550                 else if (maxcnt < cnt) {
 1551                         maxcnt = cnt;
 1552                         index = idx;
 1553                         cnt = 0;
 1554                 }
 1555         }
 1556         if (maxcnt < cnt) {
 1557                 maxcnt = cnt;
 1558                 index = idx;
 1559         }
 1560 
 1561         for (i = 0; i < 8; i++) {
 1562                 if (dcolon == 1) {
 1563                         if (*a == 0) {
 1564                                 if (i == 7)
 1565                                         *cp++ = ':';
 1566                                 a++;
 1567                                 continue;
 1568                         } else
 1569                                 dcolon = 2;
 1570                 }
 1571                 if (*a == 0) {
 1572                         if (dcolon == 0 && *(a + 1) == 0 && i == index) {
 1573                                 if (i == 0)
 1574                                         *cp++ = ':';
 1575                                 *cp++ = ':';
 1576                                 dcolon = 1;
 1577                         } else {
 1578                                 *cp++ = '';
 1579                                 *cp++ = ':';
 1580                         }
 1581                         a++;
 1582                         continue;
 1583                 }
 1584                 d = (const u_char *)a;
 1585                 /* Try to eliminate leading zeros in printout like in :0001. */
 1586                 zero = 1;
 1587                 *cp = digits[*d >> 4];
 1588                 if (*cp != '') {
 1589                         zero = 0;
 1590                         cp++;
 1591                 }
 1592                 *cp = digits[*d++ & 0xf];
 1593                 if (zero == 0 || (*cp != '')) {
 1594                         zero = 0;
 1595                         cp++;
 1596                 }
 1597                 *cp = digits[*d >> 4];
 1598                 if (zero == 0 || (*cp != '')) {
 1599                         zero = 0;
 1600                         cp++;
 1601                 }
 1602                 *cp++ = digits[*d & 0xf];
 1603                 *cp++ = ':';
 1604                 a++;
 1605         }
 1606         *--cp = '\0';
 1607         return (ip6buf);
 1608 }
 1609 
 1610 int
 1611 in6_localaddr(struct in6_addr *in6)
 1612 {
 1613         struct rm_priotracker in6_ifa_tracker;
 1614         struct in6_ifaddr *ia;
 1615 
 1616         if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
 1617                 return 1;
 1618 
 1619         IN6_IFADDR_RLOCK(&in6_ifa_tracker);
 1620         TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
 1621                 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
 1622                     &ia->ia_prefixmask.sin6_addr)) {
 1623                         IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
 1624                         return 1;
 1625                 }
 1626         }
 1627         IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
 1628 
 1629         return (0);
 1630 }
 1631 
 1632 /*
 1633  * Return 1 if an internet address is for the local host and configured
 1634  * on one of its interfaces.
 1635  */
 1636 int
 1637 in6_localip(struct in6_addr *in6)
 1638 {
 1639         struct rm_priotracker in6_ifa_tracker;
 1640         struct in6_ifaddr *ia;
 1641 
 1642         IN6_IFADDR_RLOCK(&in6_ifa_tracker);
 1643         LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) {
 1644                 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) {
 1645                         IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
 1646                         return (1);
 1647                 }
 1648         }
 1649         IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
 1650         return (0);
 1651 }
 1652  
 1653 /*
 1654  * Return 1 if an internet address is configured on an interface.
 1655  */
 1656 int
 1657 in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr)
 1658 {
 1659         struct in6_addr in6;
 1660         struct ifaddr *ifa;
 1661         struct in6_ifaddr *ia6;
 1662 
 1663         in6 = *addr;
 1664         if (in6_clearscope(&in6))
 1665                 return (0);
 1666         in6_setscope(&in6, ifp, NULL);
 1667 
 1668         IF_ADDR_RLOCK(ifp);
 1669         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1670                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1671                         continue;
 1672                 ia6 = (struct in6_ifaddr *)ifa;
 1673                 if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6)) {
 1674                         IF_ADDR_RUNLOCK(ifp);
 1675                         return (1);
 1676                 }
 1677         }
 1678         IF_ADDR_RUNLOCK(ifp);
 1679 
 1680         return (0);
 1681 }
 1682 
 1683 int
 1684 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
 1685 {
 1686         struct rm_priotracker in6_ifa_tracker;
 1687         struct in6_ifaddr *ia;
 1688 
 1689         IN6_IFADDR_RLOCK(&in6_ifa_tracker);
 1690         LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) {
 1691                 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) {
 1692                         if (ia->ia6_flags & IN6_IFF_DEPRECATED) {
 1693                                 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
 1694                                 return (1); /* true */
 1695                         }
 1696                         break;
 1697                 }
 1698         }
 1699         IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
 1700 
 1701         return (0);             /* false */
 1702 }
 1703 
 1704 /*
 1705  * return length of part which dst and src are equal
 1706  * hard coding...
 1707  */
 1708 int
 1709 in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
 1710 {
 1711         int match = 0;
 1712         u_char *s = (u_char *)src, *d = (u_char *)dst;
 1713         u_char *lim = s + 16, r;
 1714 
 1715         while (s < lim)
 1716                 if ((r = (*d++ ^ *s++)) != 0) {
 1717                         while (r < 128) {
 1718                                 match++;
 1719                                 r <<= 1;
 1720                         }
 1721                         break;
 1722                 } else
 1723                         match += 8;
 1724         return match;
 1725 }
 1726 
 1727 /* XXX: to be scope conscious */
 1728 int
 1729 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
 1730 {
 1731         int bytelen, bitlen;
 1732 
 1733         /* sanity check */
 1734         if (0 > len || len > 128) {
 1735                 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
 1736                     len);
 1737                 return (0);
 1738         }
 1739 
 1740         bytelen = len / 8;
 1741         bitlen = len % 8;
 1742 
 1743         if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
 1744                 return (0);
 1745         if (bitlen != 0 &&
 1746             p1->s6_addr[bytelen] >> (8 - bitlen) !=
 1747             p2->s6_addr[bytelen] >> (8 - bitlen))
 1748                 return (0);
 1749 
 1750         return (1);
 1751 }
 1752 
 1753 void
 1754 in6_prefixlen2mask(struct in6_addr *maskp, int len)
 1755 {
 1756         u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
 1757         int bytelen, bitlen, i;
 1758 
 1759         /* sanity check */
 1760         if (0 > len || len > 128) {
 1761                 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
 1762                     len);
 1763                 return;
 1764         }
 1765 
 1766         bzero(maskp, sizeof(*maskp));
 1767         bytelen = len / 8;
 1768         bitlen = len % 8;
 1769         for (i = 0; i < bytelen; i++)
 1770                 maskp->s6_addr[i] = 0xff;
 1771         if (bitlen)
 1772                 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
 1773 }
 1774 
 1775 /*
 1776  * return the best address out of the same scope. if no address was
 1777  * found, return the first valid address from designated IF.
 1778  */
 1779 struct in6_ifaddr *
 1780 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
 1781 {
 1782         int dst_scope = in6_addrscope(dst), blen = -1, tlen;
 1783         struct ifaddr *ifa;
 1784         struct in6_ifaddr *besta = NULL;
 1785         struct in6_ifaddr *dep[2];      /* last-resort: deprecated */
 1786 
 1787         dep[0] = dep[1] = NULL;
 1788 
 1789         /*
 1790          * We first look for addresses in the same scope.
 1791          * If there is one, return it.
 1792          * If two or more, return one which matches the dst longest.
 1793          * If none, return one of global addresses assigned other ifs.
 1794          */
 1795         IF_ADDR_RLOCK(ifp);
 1796         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1797                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1798                         continue;
 1799                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
 1800                         continue; /* XXX: is there any case to allow anycast? */
 1801                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
 1802                         continue; /* don't use this interface */
 1803                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
 1804                         continue;
 1805                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
 1806                         if (V_ip6_use_deprecated)
 1807                                 dep[0] = (struct in6_ifaddr *)ifa;
 1808                         continue;
 1809                 }
 1810 
 1811                 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
 1812                         /*
 1813                          * call in6_matchlen() as few as possible
 1814                          */
 1815                         if (besta) {
 1816                                 if (blen == -1)
 1817                                         blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
 1818                                 tlen = in6_matchlen(IFA_IN6(ifa), dst);
 1819                                 if (tlen > blen) {
 1820                                         blen = tlen;
 1821                                         besta = (struct in6_ifaddr *)ifa;
 1822                                 }
 1823                         } else
 1824                                 besta = (struct in6_ifaddr *)ifa;
 1825                 }
 1826         }
 1827         if (besta) {
 1828                 ifa_ref(&besta->ia_ifa);
 1829                 IF_ADDR_RUNLOCK(ifp);
 1830                 return (besta);
 1831         }
 1832 
 1833         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1834                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1835                         continue;
 1836                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
 1837                         continue; /* XXX: is there any case to allow anycast? */
 1838                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
 1839                         continue; /* don't use this interface */
 1840                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
 1841                         continue;
 1842                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
 1843                         if (V_ip6_use_deprecated)
 1844                                 dep[1] = (struct in6_ifaddr *)ifa;
 1845                         continue;
 1846                 }
 1847 
 1848                 if (ifa != NULL)
 1849                         ifa_ref(ifa);
 1850                 IF_ADDR_RUNLOCK(ifp);
 1851                 return (struct in6_ifaddr *)ifa;
 1852         }
 1853 
 1854         /* use the last-resort values, that are, deprecated addresses */
 1855         if (dep[0]) {
 1856                 ifa_ref((struct ifaddr *)dep[0]);
 1857                 IF_ADDR_RUNLOCK(ifp);
 1858                 return dep[0];
 1859         }
 1860         if (dep[1]) {
 1861                 ifa_ref((struct ifaddr *)dep[1]);
 1862                 IF_ADDR_RUNLOCK(ifp);
 1863                 return dep[1];
 1864         }
 1865 
 1866         IF_ADDR_RUNLOCK(ifp);
 1867         return NULL;
 1868 }
 1869 
 1870 /*
 1871  * perform DAD when interface becomes IFF_UP.
 1872  */
 1873 void
 1874 in6_if_up(struct ifnet *ifp)
 1875 {
 1876         struct ifaddr *ifa;
 1877         struct in6_ifaddr *ia;
 1878 
 1879         IF_ADDR_RLOCK(ifp);
 1880         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1881                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1882                         continue;
 1883                 ia = (struct in6_ifaddr *)ifa;
 1884                 if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
 1885                         /*
 1886                          * The TENTATIVE flag was likely set by hand
 1887                          * beforehand, implicitly indicating the need for DAD.
 1888                          * We may be able to skip the random delay in this
 1889                          * case, but we impose delays just in case.
 1890                          */
 1891                         nd6_dad_start(ifa,
 1892                             arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
 1893                 }
 1894         }
 1895         IF_ADDR_RUNLOCK(ifp);
 1896 
 1897         /*
 1898          * special cases, like 6to4, are handled in in6_ifattach
 1899          */
 1900         in6_ifattach(ifp, NULL);
 1901 }
 1902 
 1903 int
 1904 in6if_do_dad(struct ifnet *ifp)
 1905 {
 1906         if ((ifp->if_flags & IFF_LOOPBACK) != 0)
 1907                 return (0);
 1908 
 1909         if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) ||
 1910             (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD))
 1911                 return (0);
 1912 
 1913         /*
 1914          * Our DAD routine requires the interface up and running.
 1915          * However, some interfaces can be up before the RUNNING
 1916          * status.  Additionally, users may try to assign addresses
 1917          * before the interface becomes up (or running).
 1918          * This function returns EAGAIN in that case.
 1919          * The caller should mark "tentative" on the address instead of
 1920          * performing DAD immediately.
 1921          */
 1922         if (!((ifp->if_flags & IFF_UP) &&
 1923             (ifp->if_drv_flags & IFF_DRV_RUNNING)))
 1924                 return (EAGAIN);
 1925 
 1926         return (1);
 1927 }
 1928 
 1929 /*
 1930  * Calculate max IPv6 MTU through all the interfaces and store it
 1931  * to in6_maxmtu.
 1932  */
 1933 void
 1934 in6_setmaxmtu(void)
 1935 {
 1936         unsigned long maxmtu = 0;
 1937         struct ifnet *ifp;
 1938 
 1939         IFNET_RLOCK_NOSLEEP();
 1940         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
 1941                 /* this function can be called during ifnet initialization */
 1942                 if (!ifp->if_afdata[AF_INET6])
 1943                         continue;
 1944                 if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
 1945                     IN6_LINKMTU(ifp) > maxmtu)
 1946                         maxmtu = IN6_LINKMTU(ifp);
 1947         }
 1948         IFNET_RUNLOCK_NOSLEEP();
 1949         if (maxmtu)     /* update only when maxmtu is positive */
 1950                 V_in6_maxmtu = maxmtu;
 1951 }
 1952 
 1953 /*
 1954  * Provide the length of interface identifiers to be used for the link attached
 1955  * to the given interface.  The length should be defined in "IPv6 over
 1956  * xxx-link" document.  Note that address architecture might also define
 1957  * the length for a particular set of address prefixes, regardless of the
 1958  * link type.  As clarified in rfc2462bis, those two definitions should be
 1959  * consistent, and those really are as of August 2004.
 1960  */
 1961 int
 1962 in6_if2idlen(struct ifnet *ifp)
 1963 {
 1964         switch (ifp->if_type) {
 1965         case IFT_ETHER:         /* RFC2464 */
 1966         case IFT_PROPVIRTUAL:   /* XXX: no RFC. treat it as ether */
 1967         case IFT_L2VLAN:        /* ditto */
 1968         case IFT_IEEE80211:     /* ditto */
 1969         case IFT_BRIDGE:        /* bridge(4) only does Ethernet-like links */
 1970         case IFT_INFINIBAND:
 1971                 return (64);
 1972         case IFT_FDDI:          /* RFC2467 */
 1973                 return (64);
 1974         case IFT_ISO88025:      /* RFC2470 (IPv6 over Token Ring) */
 1975                 return (64);
 1976         case IFT_PPP:           /* RFC2472 */
 1977                 return (64);
 1978         case IFT_ARCNET:        /* RFC2497 */
 1979                 return (64);
 1980         case IFT_FRELAY:        /* RFC2590 */
 1981                 return (64);
 1982         case IFT_IEEE1394:      /* RFC3146 */
 1983                 return (64);
 1984         case IFT_GIF:
 1985                 return (64);    /* draft-ietf-v6ops-mech-v2-07 */
 1986         case IFT_LOOP:
 1987                 return (64);    /* XXX: is this really correct? */
 1988         default:
 1989                 /*
 1990                  * Unknown link type:
 1991                  * It might be controversial to use the today's common constant
 1992                  * of 64 for these cases unconditionally.  For full compliance,
 1993                  * we should return an error in this case.  On the other hand,
 1994                  * if we simply miss the standard for the link type or a new
 1995                  * standard is defined for a new link type, the IFID length
 1996                  * is very likely to be the common constant.  As a compromise,
 1997                  * we always use the constant, but make an explicit notice
 1998                  * indicating the "unknown" case.
 1999                  */
 2000                 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
 2001                 return (64);
 2002         }
 2003 }
 2004 
 2005 #include <sys/sysctl.h>
 2006 
 2007 struct in6_llentry {
 2008         struct llentry          base;
 2009 };
 2010 
 2011 #define IN6_LLTBL_DEFAULT_HSIZE 32
 2012 #define IN6_LLTBL_HASH(k, h) \
 2013         (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
 2014 
 2015 /*
 2016  * Do actual deallocation of @lle.
 2017  */
 2018 static void
 2019 in6_lltable_destroy_lle_unlocked(struct llentry *lle)
 2020 {
 2021 
 2022         LLE_LOCK_DESTROY(lle);
 2023         LLE_REQ_DESTROY(lle);
 2024         free(lle, M_LLTABLE);
 2025 }
 2026 
 2027 /*
 2028  * Called by LLE_FREE_LOCKED when number of references
 2029  * drops to zero.
 2030  */
 2031 static void
 2032 in6_lltable_destroy_lle(struct llentry *lle)
 2033 {
 2034 
 2035         LLE_WUNLOCK(lle);
 2036         in6_lltable_destroy_lle_unlocked(lle);
 2037 }
 2038 
 2039 static struct llentry *
 2040 in6_lltable_new(const struct in6_addr *addr6, u_int flags)
 2041 {
 2042         struct in6_llentry *lle;
 2043 
 2044         lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
 2045         if (lle == NULL)                /* NB: caller generates msg */
 2046                 return NULL;
 2047 
 2048         lle->base.r_l3addr.addr6 = *addr6;
 2049         lle->base.lle_refcnt = 1;
 2050         lle->base.lle_free = in6_lltable_destroy_lle;
 2051         LLE_LOCK_INIT(&lle->base);
 2052         LLE_REQ_INIT(&lle->base);
 2053         callout_init(&lle->base.lle_timer, 1);
 2054 
 2055         return (&lle->base);
 2056 }
 2057 
 2058 static int
 2059 in6_lltable_match_prefix(const struct sockaddr *saddr,
 2060     const struct sockaddr *smask, u_int flags, struct llentry *lle)
 2061 {
 2062         const struct in6_addr *addr, *mask, *lle_addr;
 2063 
 2064         addr = &((const struct sockaddr_in6 *)saddr)->sin6_addr;
 2065         mask = &((const struct sockaddr_in6 *)smask)->sin6_addr;
 2066         lle_addr = &lle->r_l3addr.addr6;
 2067 
 2068         if (IN6_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
 2069                 return (0);
 2070 
 2071         if (lle->la_flags & LLE_IFADDR) {
 2072 
 2073                 /*
 2074                  * Delete LLE_IFADDR records IFF address & flag matches.
 2075                  * Note that addr is the interface address within prefix
 2076                  * being matched.
 2077                  */
 2078                 if (IN6_ARE_ADDR_EQUAL(addr, lle_addr) &&
 2079                     (flags & LLE_STATIC) != 0)
 2080                         return (1);
 2081                 return (0);
 2082         }
 2083 
 2084         /* flags & LLE_STATIC means deleting both dynamic and static entries */
 2085         if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
 2086                 return (1);
 2087 
 2088         return (0);
 2089 }
 2090 
 2091 static void
 2092 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle)
 2093 {
 2094         struct ifnet *ifp;
 2095 
 2096         LLE_WLOCK_ASSERT(lle);
 2097         KASSERT(llt != NULL, ("lltable is NULL"));
 2098 
 2099         /* Unlink entry from table */
 2100         if ((lle->la_flags & LLE_LINKED) != 0) {
 2101 
 2102                 ifp = llt->llt_ifp;
 2103                 IF_AFDATA_WLOCK_ASSERT(ifp);
 2104                 lltable_unlink_entry(llt, lle);
 2105         }
 2106 
 2107         if (callout_stop(&lle->lle_timer) > 0)
 2108                 LLE_REMREF(lle);
 2109 
 2110         llentry_free(lle);
 2111 }
 2112 
 2113 static int
 2114 in6_lltable_rtcheck(struct ifnet *ifp,
 2115                     u_int flags,
 2116                     const struct sockaddr *l3addr)
 2117 {
 2118         const struct sockaddr_in6 *sin6;
 2119         struct nhop6_basic nh6;
 2120         struct in6_addr dst;
 2121         uint32_t scopeid;
 2122         int error;
 2123         char ip6buf[INET6_ADDRSTRLEN];
 2124         int fibnum;
 2125 
 2126         KASSERT(l3addr->sa_family == AF_INET6,
 2127             ("sin_family %d", l3addr->sa_family));
 2128 
 2129         sin6 = (const struct sockaddr_in6 *)l3addr;
 2130         in6_splitscope(&sin6->sin6_addr, &dst, &scopeid);
 2131         fibnum = V_rt_add_addr_allfibs ? RT_DEFAULT_FIB : ifp->if_fib;
 2132         error = fib6_lookup_nh_basic(fibnum, &dst, scopeid, 0, 0, &nh6);
 2133         if (error != 0 || (nh6.nh_flags & NHF_GATEWAY) || nh6.nh_ifp != ifp) {
 2134                 struct ifaddr *ifa;
 2135                 /*
 2136                  * Create an ND6 cache for an IPv6 neighbor
 2137                  * that is not covered by our own prefix.
 2138                  */
 2139                 ifa = ifaof_ifpforaddr(l3addr, ifp);
 2140                 if (ifa != NULL) {
 2141                         ifa_free(ifa);
 2142                         return 0;
 2143                 }
 2144                 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
 2145                     ip6_sprintf(ip6buf, &sin6->sin6_addr));
 2146                 return EINVAL;
 2147         }
 2148         return 0;
 2149 }
 2150 
 2151 static inline uint32_t
 2152 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize)
 2153 {
 2154 
 2155         return (IN6_LLTBL_HASH(dst->s6_addr32[3], hsize));
 2156 }
 2157 
 2158 static uint32_t
 2159 in6_lltable_hash(const struct llentry *lle, uint32_t hsize)
 2160 {
 2161 
 2162         return (in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize));
 2163 }
 2164 
 2165 static void
 2166 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
 2167 {
 2168         struct sockaddr_in6 *sin6;
 2169 
 2170         sin6 = (struct sockaddr_in6 *)sa;
 2171         bzero(sin6, sizeof(*sin6));
 2172         sin6->sin6_family = AF_INET6;
 2173         sin6->sin6_len = sizeof(*sin6);
 2174         sin6->sin6_addr = lle->r_l3addr.addr6;
 2175 }
 2176 
 2177 static inline struct llentry *
 2178 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst)
 2179 {
 2180         struct llentry *lle;
 2181         struct llentries *lleh;
 2182         u_int hashidx;
 2183 
 2184         hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize);
 2185         lleh = &llt->lle_head[hashidx];
 2186         LIST_FOREACH(lle, lleh, lle_next) {
 2187                 if (lle->la_flags & LLE_DELETED)
 2188                         continue;
 2189                 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst))
 2190                         break;
 2191         }
 2192 
 2193         return (lle);
 2194 }
 2195 
 2196 static void
 2197 in6_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
 2198 {
 2199 
 2200         lle->la_flags |= LLE_DELETED;
 2201         EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
 2202 #ifdef DIAGNOSTIC
 2203         log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
 2204 #endif
 2205         llentry_free(lle);
 2206 }
 2207 
 2208 static struct llentry *
 2209 in6_lltable_alloc(struct lltable *llt, u_int flags,
 2210         const struct sockaddr *l3addr)
 2211 {
 2212         const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
 2213         struct ifnet *ifp = llt->llt_ifp;
 2214         struct llentry *lle;
 2215         char linkhdr[LLE_MAX_LINKHDR];
 2216         size_t linkhdrsize;
 2217         int lladdr_off;
 2218 
 2219         KASSERT(l3addr->sa_family == AF_INET6,
 2220             ("sin_family %d", l3addr->sa_family));
 2221 
 2222         /*
 2223          * A route that covers the given address must have
 2224          * been installed 1st because we are doing a resolution,
 2225          * verify this.
 2226          */
 2227         if (!(flags & LLE_IFADDR) &&
 2228             in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
 2229                 return (NULL);
 2230 
 2231         lle = in6_lltable_new(&sin6->sin6_addr, flags);
 2232         if (lle == NULL) {
 2233                 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
 2234                 return (NULL);
 2235         }
 2236         lle->la_flags = flags;
 2237         if ((flags & LLE_IFADDR) == LLE_IFADDR) {
 2238                 linkhdrsize = LLE_MAX_LINKHDR;
 2239                 if (lltable_calc_llheader(ifp, AF_INET6, IF_LLADDR(ifp),
 2240                     linkhdr, &linkhdrsize, &lladdr_off) != 0) {
 2241                         in6_lltable_destroy_lle_unlocked(lle);
 2242                         return (NULL);
 2243                 }
 2244                 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
 2245                     lladdr_off);
 2246                 lle->la_flags |= LLE_STATIC;
 2247         }
 2248 
 2249         if ((lle->la_flags & LLE_STATIC) != 0)
 2250                 lle->ln_state = ND6_LLINFO_REACHABLE;
 2251 
 2252         return (lle);
 2253 }
 2254 
 2255 static struct llentry *
 2256 in6_lltable_lookup(struct lltable *llt, u_int flags,
 2257         const struct sockaddr *l3addr)
 2258 {
 2259         const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
 2260         struct llentry *lle;
 2261 
 2262         IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
 2263         KASSERT(l3addr->sa_family == AF_INET6,
 2264             ("sin_family %d", l3addr->sa_family));
 2265 
 2266         lle = in6_lltable_find_dst(llt, &sin6->sin6_addr);
 2267 
 2268         if (lle == NULL)
 2269                 return (NULL);
 2270 
 2271         KASSERT((flags & (LLE_UNLOCKED|LLE_EXCLUSIVE)) !=
 2272             (LLE_UNLOCKED|LLE_EXCLUSIVE),("wrong lle request flags: 0x%X",
 2273             flags));
 2274 
 2275         if (flags & LLE_UNLOCKED)
 2276                 return (lle);
 2277 
 2278         if (flags & LLE_EXCLUSIVE)
 2279                 LLE_WLOCK(lle);
 2280         else
 2281                 LLE_RLOCK(lle);
 2282         return (lle);
 2283 }
 2284 
 2285 static int
 2286 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
 2287     struct sysctl_req *wr)
 2288 {
 2289         struct ifnet *ifp = llt->llt_ifp;
 2290         /* XXX stack use */
 2291         struct {
 2292                 struct rt_msghdr        rtm;
 2293                 struct sockaddr_in6     sin6;
 2294                 /*
 2295                  * ndp.c assumes that sdl is word aligned
 2296                  */
 2297 #ifdef __LP64__
 2298                 uint32_t                pad;
 2299 #endif
 2300                 struct sockaddr_dl      sdl;
 2301         } ndpc;
 2302         struct sockaddr_dl *sdl;
 2303         int error;
 2304 
 2305         bzero(&ndpc, sizeof(ndpc));
 2306                         /* skip deleted entries */
 2307                         if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
 2308                                 return (0);
 2309                         /* Skip if jailed and not a valid IP of the prison. */
 2310                         lltable_fill_sa_entry(lle,
 2311                             (struct sockaddr *)&ndpc.sin6);
 2312                         if (prison_if(wr->td->td_ucred,
 2313                             (struct sockaddr *)&ndpc.sin6) != 0)
 2314                                 return (0);
 2315                         /*
 2316                          * produce a msg made of:
 2317                          *  struct rt_msghdr;
 2318                          *  struct sockaddr_in6 (IPv6)
 2319                          *  struct sockaddr_dl;
 2320                          */
 2321                         ndpc.rtm.rtm_msglen = sizeof(ndpc);
 2322                         ndpc.rtm.rtm_version = RTM_VERSION;
 2323                         ndpc.rtm.rtm_type = RTM_GET;
 2324                         ndpc.rtm.rtm_flags = RTF_UP;
 2325                         ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
 2326                         if (V_deembed_scopeid)
 2327                                 sa6_recoverscope(&ndpc.sin6);
 2328 
 2329                         /* publish */
 2330                         if (lle->la_flags & LLE_PUB)
 2331                                 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
 2332 
 2333                         sdl = &ndpc.sdl;
 2334                         sdl->sdl_family = AF_LINK;
 2335                         sdl->sdl_len = sizeof(*sdl);
 2336                         sdl->sdl_index = ifp->if_index;
 2337                         sdl->sdl_type = ifp->if_type;
 2338                         if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
 2339                                 sdl->sdl_alen = ifp->if_addrlen;
 2340                                 bcopy(lle->ll_addr, LLADDR(sdl),
 2341                                     ifp->if_addrlen);
 2342                         } else {
 2343                                 sdl->sdl_alen = 0;
 2344                                 bzero(LLADDR(sdl), ifp->if_addrlen);
 2345                         }
 2346                         if (lle->la_expire != 0)
 2347                                 ndpc.rtm.rtm_rmx.rmx_expire = lle->la_expire +
 2348                                     lle->lle_remtime / hz +
 2349                                     time_second - time_uptime;
 2350                         ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
 2351                         if (lle->la_flags & LLE_STATIC)
 2352                                 ndpc.rtm.rtm_flags |= RTF_STATIC;
 2353                         if (lle->la_flags & LLE_IFADDR)
 2354                                 ndpc.rtm.rtm_flags |= RTF_PINNED;
 2355                         if (lle->ln_router != 0)
 2356                                 ndpc.rtm.rtm_flags |= RTF_GATEWAY;
 2357                         ndpc.rtm.rtm_rmx.rmx_pksent = lle->la_asked;
 2358                         /* Store state in rmx_weight value */
 2359                         ndpc.rtm.rtm_rmx.rmx_state = lle->ln_state;
 2360                         ndpc.rtm.rtm_index = ifp->if_index;
 2361                         error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
 2362 
 2363         return (error);
 2364 }
 2365 
 2366 static struct lltable *
 2367 in6_lltattach(struct ifnet *ifp)
 2368 {
 2369         struct lltable *llt;
 2370 
 2371         llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE);
 2372         llt->llt_af = AF_INET6;
 2373         llt->llt_ifp = ifp;
 2374 
 2375         llt->llt_lookup = in6_lltable_lookup;
 2376         llt->llt_alloc_entry = in6_lltable_alloc;
 2377         llt->llt_delete_entry = in6_lltable_delete_entry;
 2378         llt->llt_dump_entry = in6_lltable_dump_entry;
 2379         llt->llt_hash = in6_lltable_hash;
 2380         llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry;
 2381         llt->llt_free_entry = in6_lltable_free_entry;
 2382         llt->llt_match_prefix = in6_lltable_match_prefix;
 2383         lltable_link(llt);
 2384 
 2385         return (llt);
 2386 }
 2387 
 2388 void *
 2389 in6_domifattach(struct ifnet *ifp)
 2390 {
 2391         struct in6_ifextra *ext;
 2392 
 2393         /* There are not IPv6-capable interfaces. */
 2394         switch (ifp->if_type) {
 2395         case IFT_PFLOG:
 2396         case IFT_PFSYNC:
 2397         case IFT_USB:
 2398                 return (NULL);
 2399         }
 2400         ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
 2401         bzero(ext, sizeof(*ext));
 2402 
 2403         ext->in6_ifstat = malloc(sizeof(counter_u64_t) *
 2404             sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK);
 2405         COUNTER_ARRAY_ALLOC(ext->in6_ifstat,
 2406             sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK);
 2407 
 2408         ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) *
 2409             sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR,
 2410             M_WAITOK);
 2411         COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat,
 2412             sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK);
 2413 
 2414         ext->nd_ifinfo = nd6_ifattach(ifp);
 2415         ext->scope6_id = scope6_ifattach(ifp);
 2416         ext->lltable = in6_lltattach(ifp);
 2417 
 2418         ext->mld_ifinfo = mld_domifattach(ifp);
 2419 
 2420         return ext;
 2421 }
 2422 
 2423 int
 2424 in6_domifmtu(struct ifnet *ifp)
 2425 {
 2426         if (ifp->if_afdata[AF_INET6] == NULL)
 2427                 return ifp->if_mtu;
 2428 
 2429         return (IN6_LINKMTU(ifp));
 2430 }
 2431 
 2432 void
 2433 in6_domifdetach(struct ifnet *ifp, void *aux)
 2434 {
 2435         struct in6_ifextra *ext = (struct in6_ifextra *)aux;
 2436 
 2437         mld_domifdetach(ifp);
 2438         scope6_ifdetach(ext->scope6_id);
 2439         nd6_ifdetach(ifp, ext->nd_ifinfo);
 2440         lltable_free(ext->lltable);
 2441         COUNTER_ARRAY_FREE(ext->in6_ifstat,
 2442             sizeof(struct in6_ifstat) / sizeof(uint64_t));
 2443         free(ext->in6_ifstat, M_IFADDR);
 2444         COUNTER_ARRAY_FREE(ext->icmp6_ifstat,
 2445             sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
 2446         free(ext->icmp6_ifstat, M_IFADDR);
 2447         free(ext, M_IFADDR);
 2448 }
 2449 
 2450 /*
 2451  * Convert sockaddr_in6 to sockaddr_in.  Original sockaddr_in6 must be
 2452  * v4 mapped addr or v4 compat addr
 2453  */
 2454 void
 2455 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
 2456 {
 2457 
 2458         bzero(sin, sizeof(*sin));
 2459         sin->sin_len = sizeof(struct sockaddr_in);
 2460         sin->sin_family = AF_INET;
 2461         sin->sin_port = sin6->sin6_port;
 2462         sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
 2463 }
 2464 
 2465 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
 2466 void
 2467 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
 2468 {
 2469         bzero(sin6, sizeof(*sin6));
 2470         sin6->sin6_len = sizeof(struct sockaddr_in6);
 2471         sin6->sin6_family = AF_INET6;
 2472         sin6->sin6_port = sin->sin_port;
 2473         sin6->sin6_addr.s6_addr32[0] = 0;
 2474         sin6->sin6_addr.s6_addr32[1] = 0;
 2475         sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
 2476         sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
 2477 }
 2478 
 2479 /* Convert sockaddr_in6 into sockaddr_in. */
 2480 void
 2481 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
 2482 {
 2483         struct sockaddr_in *sin_p;
 2484         struct sockaddr_in6 sin6;
 2485 
 2486         /*
 2487          * Save original sockaddr_in6 addr and convert it
 2488          * to sockaddr_in.
 2489          */
 2490         sin6 = *(struct sockaddr_in6 *)nam;
 2491         sin_p = (struct sockaddr_in *)nam;
 2492         in6_sin6_2_sin(sin_p, &sin6);
 2493 }
 2494 
 2495 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
 2496 void
 2497 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
 2498 {
 2499         struct sockaddr_in *sin_p;
 2500         struct sockaddr_in6 *sin6_p;
 2501 
 2502         sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK);
 2503         sin_p = (struct sockaddr_in *)*nam;
 2504         in6_sin_2_v4mapsin6(sin_p, sin6_p);
 2505         free(*nam, M_SONAME);
 2506         *nam = (struct sockaddr *)sin6_p;
 2507 }

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