The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6_ifattach.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_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: releng/7.4/sys/netinet6/in6_ifattach.c 196549 2009-08-25 19:04:22Z bz $");
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/malloc.h>
   38 #include <sys/socket.h>
   39 #include <sys/sockio.h>
   40 #include <sys/kernel.h>
   41 #include <sys/syslog.h>
   42 #include <sys/md5.h>
   43 
   44 #include <net/if.h>
   45 #include <net/if_dl.h>
   46 #include <net/if_types.h>
   47 #include <net/route.h>
   48 
   49 #include <netinet/in.h>
   50 #include <netinet/in_var.h>
   51 #include <netinet/if_ether.h>
   52 #include <netinet/in_pcb.h>
   53 
   54 #include <netinet/ip6.h>
   55 #include <netinet6/ip6_var.h>
   56 #include <netinet6/in6_var.h>
   57 #include <netinet6/in6_pcb.h>
   58 #include <netinet6/in6_ifattach.h>
   59 #include <netinet6/ip6_var.h>
   60 #include <netinet6/nd6.h>
   61 #include <netinet6/scope6_var.h>
   62 
   63 unsigned long in6_maxmtu = 0;
   64 
   65 #ifdef IP6_AUTO_LINKLOCAL
   66 int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL;
   67 #else
   68 int ip6_auto_linklocal = 1;     /* enable by default */
   69 #endif
   70 
   71 struct callout in6_tmpaddrtimer_ch;
   72 
   73 extern struct inpcbinfo udbinfo;
   74 extern struct inpcbinfo ripcbinfo;
   75 
   76 static int get_rand_ifid(struct ifnet *, struct in6_addr *);
   77 static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *);
   78 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *);
   79 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *);
   80 static int in6_ifattach_loopback(struct ifnet *);
   81 static void in6_purgemaddrs(struct ifnet *);
   82 
   83 #define EUI64_GBIT      0x01
   84 #define EUI64_UBIT      0x02
   85 #define EUI64_TO_IFID(in6)      do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
   86 #define EUI64_GROUP(in6)        ((in6)->s6_addr[8] & EUI64_GBIT)
   87 #define EUI64_INDIVIDUAL(in6)   (!EUI64_GROUP(in6))
   88 #define EUI64_LOCAL(in6)        ((in6)->s6_addr[8] & EUI64_UBIT)
   89 #define EUI64_UNIVERSAL(in6)    (!EUI64_LOCAL(in6))
   90 
   91 #define IFID_LOCAL(in6)         (!EUI64_LOCAL(in6))
   92 #define IFID_UNIVERSAL(in6)     (!EUI64_UNIVERSAL(in6))
   93 
   94 /*
   95  * Generate a last-resort interface identifier, when the machine has no
   96  * IEEE802/EUI64 address sources.
   97  * The goal here is to get an interface identifier that is
   98  * (1) random enough and (2) does not change across reboot.
   99  * We currently use MD5(hostname) for it.
  100  *
  101  * in6 - upper 64bits are preserved
  102  */
  103 static int
  104 get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6)
  105 {
  106         MD5_CTX ctxt;
  107         u_int8_t digest[16];
  108         int hostnamelen = strlen(hostname);
  109 
  110 #if 0
  111         /* we need at least several letters as seed for ifid */
  112         if (hostnamelen < 3)
  113                 return -1;
  114 #endif
  115 
  116         /* generate 8 bytes of pseudo-random value. */
  117         bzero(&ctxt, sizeof(ctxt));
  118         MD5Init(&ctxt);
  119         MD5Update(&ctxt, hostname, hostnamelen);
  120         MD5Final(digest, &ctxt);
  121 
  122         /* assumes sizeof(digest) > sizeof(ifid) */
  123         bcopy(digest, &in6->s6_addr[8], 8);
  124 
  125         /* make sure to set "u" bit to local, and "g" bit to individual. */
  126         in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
  127         in6->s6_addr[8] |= EUI64_UBIT;  /* u bit to "local" */
  128 
  129         /* convert EUI64 into IPv6 interface identifier */
  130         EUI64_TO_IFID(in6);
  131 
  132         return 0;
  133 }
  134 
  135 static int
  136 generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret)
  137 {
  138         MD5_CTX ctxt;
  139         u_int8_t seed[16], digest[16], nullbuf[8];
  140         u_int32_t val32;
  141 
  142         /* If there's no history, start with a random seed. */
  143         bzero(nullbuf, sizeof(nullbuf));
  144         if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
  145                 int i;
  146 
  147                 for (i = 0; i < 2; i++) {
  148                         val32 = arc4random();
  149                         bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32));
  150                 }
  151         } else
  152                 bcopy(seed0, seed, 8);
  153 
  154         /* copy the right-most 64-bits of the given address */
  155         /* XXX assumption on the size of IFID */
  156         bcopy(seed1, &seed[8], 8);
  157 
  158         if (0) {                /* for debugging purposes only */
  159                 int i;
  160 
  161                 printf("generate_tmp_ifid: new randomized ID from: ");
  162                 for (i = 0; i < 16; i++)
  163                         printf("%02x", seed[i]);
  164                 printf(" ");
  165         }
  166 
  167         /* generate 16 bytes of pseudo-random value. */
  168         bzero(&ctxt, sizeof(ctxt));
  169         MD5Init(&ctxt);
  170         MD5Update(&ctxt, seed, sizeof(seed));
  171         MD5Final(digest, &ctxt);
  172 
  173         /*
  174          * RFC 3041 3.2.1. (3)
  175          * Take the left-most 64-bits of the MD5 digest and set bit 6 (the
  176          * left-most bit is numbered 0) to zero.
  177          */
  178         bcopy(digest, ret, 8);
  179         ret[0] &= ~EUI64_UBIT;
  180 
  181         /*
  182          * XXX: we'd like to ensure that the generated value is not zero
  183          * for simplicity.  If the caclculated digest happens to be zero,
  184          * use a random non-zero value as the last resort.
  185          */
  186         if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) {
  187                 nd6log((LOG_INFO,
  188                     "generate_tmp_ifid: computed MD5 value is zero.\n"));
  189 
  190                 val32 = arc4random();
  191                 val32 = 1 + (val32 % (0xffffffff - 1));
  192         }
  193 
  194         /*
  195          * RFC 3041 3.2.1. (4)
  196          * Take the rightmost 64-bits of the MD5 digest and save them in
  197          * stable storage as the history value to be used in the next
  198          * iteration of the algorithm.
  199          */
  200         bcopy(&digest[8], seed0, 8);
  201 
  202         if (0) {                /* for debugging purposes only */
  203                 int i;
  204 
  205                 printf("to: ");
  206                 for (i = 0; i < 16; i++)
  207                         printf("%02x", digest[i]);
  208                 printf("\n");
  209         }
  210 
  211         return 0;
  212 }
  213 
  214 /*
  215  * Get interface identifier for the specified interface.
  216  * XXX assumes single sockaddr_dl (AF_LINK address) per an interface
  217  *
  218  * in6 - upper 64bits are preserved
  219  */
  220 int
  221 in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6)
  222 {
  223         struct ifaddr *ifa;
  224         struct sockaddr_dl *sdl;
  225         u_int8_t *addr;
  226         size_t addrlen;
  227         static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
  228         static u_int8_t allone[8] =
  229                 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
  230 
  231         for (ifa = ifp->if_addrlist.tqh_first;
  232              ifa;
  233              ifa = ifa->ifa_list.tqe_next) {
  234                 if (ifa->ifa_addr->sa_family != AF_LINK)
  235                         continue;
  236                 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  237                 if (sdl == NULL)
  238                         continue;
  239                 if (sdl->sdl_alen == 0)
  240                         continue;
  241 
  242                 goto found;
  243         }
  244 
  245         return -1;
  246 
  247 found:
  248         addr = LLADDR(sdl);
  249         addrlen = sdl->sdl_alen;
  250 
  251         /* get EUI64 */
  252         switch (ifp->if_type) {
  253         case IFT_ETHER:
  254         case IFT_FDDI:
  255         case IFT_ISO88025:
  256         case IFT_ATM:
  257         case IFT_IEEE1394:
  258 #ifdef IFT_IEEE80211
  259         case IFT_IEEE80211:
  260 #endif
  261                 /* IEEE802/EUI64 cases - what others? */
  262                 /* IEEE1394 uses 16byte length address starting with EUI64 */
  263                 if (addrlen > 8)
  264                         addrlen = 8;
  265 
  266                 /* look at IEEE802/EUI64 only */
  267                 if (addrlen != 8 && addrlen != 6)
  268                         return -1;
  269 
  270                 /*
  271                  * check for invalid MAC address - on bsdi, we see it a lot
  272                  * since wildboar configures all-zero MAC on pccard before
  273                  * card insertion.
  274                  */
  275                 if (bcmp(addr, allzero, addrlen) == 0)
  276                         return -1;
  277                 if (bcmp(addr, allone, addrlen) == 0)
  278                         return -1;
  279 
  280                 /* make EUI64 address */
  281                 if (addrlen == 8)
  282                         bcopy(addr, &in6->s6_addr[8], 8);
  283                 else if (addrlen == 6) {
  284                         in6->s6_addr[8] = addr[0];
  285                         in6->s6_addr[9] = addr[1];
  286                         in6->s6_addr[10] = addr[2];
  287                         in6->s6_addr[11] = 0xff;
  288                         in6->s6_addr[12] = 0xfe;
  289                         in6->s6_addr[13] = addr[3];
  290                         in6->s6_addr[14] = addr[4];
  291                         in6->s6_addr[15] = addr[5];
  292                 }
  293                 break;
  294 
  295         case IFT_ARCNET:
  296                 if (addrlen != 1)
  297                         return -1;
  298                 if (!addr[0])
  299                         return -1;
  300 
  301                 bzero(&in6->s6_addr[8], 8);
  302                 in6->s6_addr[15] = addr[0];
  303 
  304                 /*
  305                  * due to insufficient bitwidth, we mark it local.
  306                  */
  307                 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
  308                 in6->s6_addr[8] |= EUI64_UBIT;  /* u bit to "local" */
  309                 break;
  310 
  311         case IFT_GIF:
  312 #ifdef IFT_STF
  313         case IFT_STF:
  314 #endif
  315                 /*
  316                  * RFC2893 says: "SHOULD use IPv4 address as ifid source".
  317                  * however, IPv4 address is not very suitable as unique
  318                  * identifier source (can be renumbered).
  319                  * we don't do this.
  320                  */
  321                 return -1;
  322 
  323         default:
  324                 return -1;
  325         }
  326 
  327         /* sanity check: g bit must not indicate "group" */
  328         if (EUI64_GROUP(in6))
  329                 return -1;
  330 
  331         /* convert EUI64 into IPv6 interface identifier */
  332         EUI64_TO_IFID(in6);
  333 
  334         /*
  335          * sanity check: ifid must not be all zero, avoid conflict with
  336          * subnet router anycast
  337          */
  338         if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
  339             bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
  340                 return -1;
  341         }
  342 
  343         return 0;
  344 }
  345 
  346 /*
  347  * Get interface identifier for the specified interface.  If it is not
  348  * available on ifp0, borrow interface identifier from other information
  349  * sources.
  350  *
  351  * altifp - secondary EUI64 source
  352  */
  353 static int
  354 get_ifid(struct ifnet *ifp0, struct ifnet *altifp,
  355     struct in6_addr *in6)
  356 {
  357         struct ifnet *ifp;
  358 
  359         /* first, try to get it from the interface itself */
  360         if (in6_get_hw_ifid(ifp0, in6) == 0) {
  361                 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
  362                     if_name(ifp0)));
  363                 goto success;
  364         }
  365 
  366         /* try secondary EUI64 source. this basically is for ATM PVC */
  367         if (altifp && in6_get_hw_ifid(altifp, in6) == 0) {
  368                 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
  369                     if_name(ifp0), if_name(altifp)));
  370                 goto success;
  371         }
  372 
  373         /* next, try to get it from some other hardware interface */
  374         IFNET_RLOCK();
  375         for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) {
  376                 if (ifp == ifp0)
  377                         continue;
  378                 if (in6_get_hw_ifid(ifp, in6) != 0)
  379                         continue;
  380 
  381                 /*
  382                  * to borrow ifid from other interface, ifid needs to be
  383                  * globally unique
  384                  */
  385                 if (IFID_UNIVERSAL(in6)) {
  386                         nd6log((LOG_DEBUG,
  387                             "%s: borrow interface identifier from %s\n",
  388                             if_name(ifp0), if_name(ifp)));
  389                         IFNET_RUNLOCK();
  390                         goto success;
  391                 }
  392         }
  393         IFNET_RUNLOCK();
  394 
  395         /* last resort: get from random number source */
  396         if (get_rand_ifid(ifp, in6) == 0) {
  397                 nd6log((LOG_DEBUG,
  398                     "%s: interface identifier generated by random number\n",
  399                     if_name(ifp0)));
  400                 goto success;
  401         }
  402 
  403         printf("%s: failed to get interface identifier\n", if_name(ifp0));
  404         return -1;
  405 
  406 success:
  407         nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
  408             if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10],
  409             in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13],
  410             in6->s6_addr[14], in6->s6_addr[15]));
  411         return 0;
  412 }
  413 
  414 /*
  415  * altifp - secondary EUI64 source
  416  */
  417 static int
  418 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp)
  419 {
  420         struct in6_ifaddr *ia;
  421         struct in6_aliasreq ifra;
  422         struct nd_prefixctl pr0;
  423         int i, error;
  424 
  425         /*
  426          * configure link-local address.
  427          */
  428         bzero(&ifra, sizeof(ifra));
  429 
  430         /*
  431          * in6_update_ifa() does not use ifra_name, but we accurately set it
  432          * for safety.
  433          */
  434         strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
  435 
  436         ifra.ifra_addr.sin6_family = AF_INET6;
  437         ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
  438         ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000);
  439         ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
  440         if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
  441                 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
  442                 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
  443         } else {
  444                 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
  445                         nd6log((LOG_ERR,
  446                             "%s: no ifid available\n", if_name(ifp)));
  447                         return (-1);
  448                 }
  449         }
  450         if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL))
  451                 return (-1);
  452 
  453         ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
  454         ifra.ifra_prefixmask.sin6_family = AF_INET6;
  455         ifra.ifra_prefixmask.sin6_addr = in6mask64;
  456         /* link-local addresses should NEVER expire. */
  457         ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
  458         ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
  459 
  460         /*
  461          * Now call in6_update_ifa() to do a bunch of procedures to configure
  462          * a link-local address. We can set the 3rd argument to NULL, because
  463          * we know there's no other link-local address on the interface
  464          * and therefore we are adding one (instead of updating one).
  465          */
  466         if ((error = in6_update_ifa(ifp, &ifra, NULL,
  467                                     IN6_IFAUPDATE_DADDELAY)) != 0) {
  468                 /*
  469                  * XXX: When the interface does not support IPv6, this call
  470                  * would fail in the SIOCSIFADDR ioctl.  I believe the
  471                  * notification is rather confusing in this case, so just
  472                  * suppress it.  (jinmei@kame.net 20010130)
  473                  */
  474                 if (error != EAFNOSUPPORT)
  475                         nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to "
  476                             "configure a link-local address on %s "
  477                             "(errno=%d)\n",
  478                             if_name(ifp), error));
  479                 return (-1);
  480         }
  481 
  482         ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
  483 #ifdef DIAGNOSTIC
  484         if (!ia) {
  485                 panic("ia == NULL in in6_ifattach_linklocal");
  486                 /* NOTREACHED */
  487         }
  488 #endif
  489 
  490         /*
  491          * Make the link-local prefix (fe80::%link/64) as on-link.
  492          * Since we'd like to manage prefixes separately from addresses,
  493          * we make an ND6 prefix structure for the link-local prefix,
  494          * and add it to the prefix list as a never-expire prefix.
  495          * XXX: this change might affect some existing code base...
  496          */
  497         bzero(&pr0, sizeof(pr0));
  498         pr0.ndpr_ifp = ifp;
  499         /* this should be 64 at this moment. */
  500         pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
  501         pr0.ndpr_prefix = ifra.ifra_addr;
  502         /* apply the mask for safety. (nd6_prelist_add will apply it again) */
  503         for (i = 0; i < 4; i++) {
  504                 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
  505                     in6mask64.s6_addr32[i];
  506         }
  507         /*
  508          * Initialize parameters.  The link-local prefix must always be
  509          * on-link, and its lifetimes never expire.
  510          */
  511         pr0.ndpr_raf_onlink = 1;
  512         pr0.ndpr_raf_auto = 1;  /* probably meaningless */
  513         pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
  514         pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
  515         /*
  516          * Since there is no other link-local addresses, nd6_prefix_lookup()
  517          * probably returns NULL.  However, we cannot always expect the result.
  518          * For example, if we first remove the (only) existing link-local
  519          * address, and then reconfigure another one, the prefix is still
  520          * valid with referring to the old link-local address.
  521          */
  522         if (nd6_prefix_lookup(&pr0) == NULL) {
  523                 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
  524                         return (error);
  525         }
  526 
  527         return 0;
  528 }
  529 
  530 /*
  531  * ifp - must be IFT_LOOP
  532  */
  533 static int
  534 in6_ifattach_loopback(struct ifnet *ifp)
  535 {
  536         struct in6_aliasreq ifra;
  537         int error;
  538 
  539         bzero(&ifra, sizeof(ifra));
  540 
  541         /*
  542          * in6_update_ifa() does not use ifra_name, but we accurately set it
  543          * for safety.
  544          */
  545         strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
  546 
  547         ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
  548         ifra.ifra_prefixmask.sin6_family = AF_INET6;
  549         ifra.ifra_prefixmask.sin6_addr = in6mask128;
  550 
  551         /*
  552          * Always initialize ia_dstaddr (= broadcast address) to loopback
  553          * address.  Follows IPv4 practice - see in_ifinit().
  554          */
  555         ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
  556         ifra.ifra_dstaddr.sin6_family = AF_INET6;
  557         ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
  558 
  559         ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
  560         ifra.ifra_addr.sin6_family = AF_INET6;
  561         ifra.ifra_addr.sin6_addr = in6addr_loopback;
  562 
  563         /* the loopback  address should NEVER expire. */
  564         ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
  565         ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
  566 
  567         /* we don't need to perform DAD on loopback interfaces. */
  568         ifra.ifra_flags |= IN6_IFF_NODAD;
  569 
  570         /* skip registration to the prefix list. XXX should be temporary. */
  571         ifra.ifra_flags |= IN6_IFF_NOPFX;
  572 
  573         /*
  574          * We are sure that this is a newly assigned address, so we can set
  575          * NULL to the 3rd arg.
  576          */
  577         if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) {
  578                 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure "
  579                     "the loopback address on %s (errno=%d)\n",
  580                     if_name(ifp), error));
  581                 return (-1);
  582         }
  583 
  584         return 0;
  585 }
  586 
  587 /*
  588  * compute NI group address, based on the current hostname setting.
  589  * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later).
  590  *
  591  * when ifp == NULL, the caller is responsible for filling scopeid.
  592  */
  593 int
  594 in6_nigroup(struct ifnet *ifp, const char *name, int namelen,
  595     struct in6_addr *in6)
  596 {
  597         const char *p;
  598         u_char *q;
  599         MD5_CTX ctxt;
  600         u_int8_t digest[16];
  601         char l;
  602         char n[64];     /* a single label must not exceed 63 chars */
  603 
  604         if (!namelen || !name)
  605                 return -1;
  606 
  607         p = name;
  608         while (p && *p && *p != '.' && p - name < namelen)
  609                 p++;
  610         if (p - name > sizeof(n) - 1)
  611                 return -1;      /* label too long */
  612         l = p - name;
  613         strncpy(n, name, l);
  614         n[(int)l] = '\0';
  615         for (q = n; *q; q++) {
  616                 if ('A' <= *q && *q <= 'Z')
  617                         *q = *q - 'A' + 'a';
  618         }
  619 
  620         /* generate 8 bytes of pseudo-random value. */
  621         bzero(&ctxt, sizeof(ctxt));
  622         MD5Init(&ctxt);
  623         MD5Update(&ctxt, &l, sizeof(l));
  624         MD5Update(&ctxt, n, l);
  625         MD5Final(digest, &ctxt);
  626 
  627         bzero(in6, sizeof(*in6));
  628         in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL;
  629         in6->s6_addr8[11] = 2;
  630         bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3]));
  631         if (in6_setscope(in6, ifp, NULL))
  632                 return (-1); /* XXX: should not fail */
  633 
  634         return 0;
  635 }
  636 
  637 /*
  638  * XXX multiple loopback interface needs more care.  for instance,
  639  * nodelocal address needs to be configured onto only one of them.
  640  * XXX multiple link-local address case
  641  *
  642  * altifp - secondary EUI64 source
  643  */
  644 void
  645 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp)
  646 {
  647         struct in6_ifaddr *ia;
  648         struct in6_addr in6;
  649 
  650         /* some of the interfaces are inherently not IPv6 capable */
  651         switch (ifp->if_type) {
  652         case IFT_PFLOG:
  653         case IFT_PFSYNC:
  654         case IFT_CARP:
  655                 return;
  656         }
  657 
  658         /*
  659          * quirks based on interface type
  660          */
  661         switch (ifp->if_type) {
  662 #ifdef IFT_STF
  663         case IFT_STF:
  664                 /*
  665                  * 6to4 interface is a very special kind of beast.
  666                  * no multicast, no linklocal.  RFC2529 specifies how to make
  667                  * linklocals for 6to4 interface, but there's no use and
  668                  * it is rather harmful to have one.
  669                  */
  670                 goto statinit;
  671 #endif
  672         default:
  673                 break;
  674         }
  675 
  676         /*
  677          * usually, we require multicast capability to the interface
  678          */
  679         if ((ifp->if_flags & IFF_MULTICAST) == 0) {
  680                 nd6log((LOG_INFO, "in6_ifattach: "
  681                     "%s is not multicast capable, IPv6 not enabled\n",
  682                     if_name(ifp)));
  683                 return;
  684         }
  685 
  686         /*
  687          * assign loopback address for loopback interface.
  688          * XXX multiple loopback interface case.
  689          */
  690         if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
  691                 in6 = in6addr_loopback;
  692                 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) {
  693                         if (in6_ifattach_loopback(ifp) != 0)
  694                                 return;
  695                 }
  696         }
  697 
  698         /*
  699          * assign a link-local address, if there's none.
  700          */
  701         if (ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) {
  702                 ia = in6ifa_ifpforlinklocal(ifp, 0);
  703                 if (ia == NULL) {
  704                         if (in6_ifattach_linklocal(ifp, altifp) == 0) {
  705                                 /* linklocal address assigned */
  706                         } else {
  707                                 /* failed to assign linklocal address. bark? */
  708                         }
  709                 }
  710         }
  711 
  712 #ifdef IFT_STF                  /* XXX */
  713 statinit:
  714 #endif
  715 
  716         /* update dynamically. */
  717         if (in6_maxmtu < ifp->if_mtu)
  718                 in6_maxmtu = ifp->if_mtu;
  719 }
  720 
  721 /*
  722  * NOTE: in6_ifdetach() does not support loopback if at this moment.
  723  * We don't need this function in bsdi, because interfaces are never removed
  724  * from the ifnet list in bsdi.
  725  */
  726 void
  727 in6_ifdetach(struct ifnet *ifp)
  728 {
  729         struct in6_ifaddr *ia, *oia;
  730         struct ifaddr *ifa, *next;
  731         struct rtentry *rt;
  732         short rtflags;
  733         struct sockaddr_in6 sin6;
  734         struct in6_multi_mship *imm;
  735 
  736         /* remove neighbor management table */
  737         nd6_purge(ifp);
  738 
  739         /* nuke any of IPv6 addresses we have */
  740         for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) {
  741                 next = ifa->ifa_list.tqe_next;
  742                 if (ifa->ifa_addr->sa_family != AF_INET6)
  743                         continue;
  744                 in6_purgeaddr(ifa);
  745         }
  746 
  747         /* undo everything done by in6_ifattach(), just in case */
  748         for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) {
  749                 next = ifa->ifa_list.tqe_next;
  750 
  751                 if (ifa->ifa_addr->sa_family != AF_INET6
  752                  || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
  753                         continue;
  754                 }
  755 
  756                 ia = (struct in6_ifaddr *)ifa;
  757 
  758                 /*
  759                  * leave from multicast groups we have joined for the interface
  760                  */
  761                 while ((imm = ia->ia6_memberships.lh_first) != NULL) {
  762                         LIST_REMOVE(imm, i6mm_chain);
  763                         in6_leavegroup(imm);
  764                 }
  765 
  766                 /* remove from the routing table */
  767                 if ((ia->ia_flags & IFA_ROUTE) &&
  768                     (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) {
  769                         rtflags = rt->rt_flags;
  770                         RTFREE_LOCKED(rt);
  771                         rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr,
  772                             (struct sockaddr *)&ia->ia_addr,
  773                             (struct sockaddr *)&ia->ia_prefixmask,
  774                             rtflags, (struct rtentry **)0);
  775                 }
  776 
  777                 /* remove from the linked list */
  778                 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list);
  779                 IFAFREE(&ia->ia_ifa);
  780 
  781                 /* also remove from the IPv6 address chain(itojun&jinmei) */
  782                 oia = ia;
  783                 if (oia == (ia = in6_ifaddr))
  784                         in6_ifaddr = ia->ia_next;
  785                 else {
  786                         while (ia->ia_next && (ia->ia_next != oia))
  787                                 ia = ia->ia_next;
  788                         if (ia->ia_next)
  789                                 ia->ia_next = oia->ia_next;
  790                         else {
  791                                 nd6log((LOG_ERR,
  792                                     "%s: didn't unlink in6ifaddr from list\n",
  793                                     if_name(ifp)));
  794                         }
  795                 }
  796 
  797                 IFAFREE(&oia->ia_ifa);
  798         }
  799 
  800         in6_pcbpurgeif0(&udbinfo, ifp);
  801         in6_pcbpurgeif0(&ripcbinfo, ifp);
  802         /* leave from all multicast groups joined */
  803         in6_purgemaddrs(ifp);
  804 
  805         /*
  806          * remove neighbor management table.  we call it twice just to make
  807          * sure we nuke everything.  maybe we need just one call.
  808          * XXX: since the first call did not release addresses, some prefixes
  809          * might remain.  We should call nd6_purge() again to release the
  810          * prefixes after removing all addresses above.
  811          * (Or can we just delay calling nd6_purge until at this point?)
  812          */
  813         nd6_purge(ifp);
  814 
  815         /* remove route to link-local allnodes multicast (ff02::1) */
  816         bzero(&sin6, sizeof(sin6));
  817         sin6.sin6_len = sizeof(struct sockaddr_in6);
  818         sin6.sin6_family = AF_INET6;
  819         sin6.sin6_addr = in6addr_linklocal_allnodes;
  820         if (in6_setscope(&sin6.sin6_addr, ifp, NULL))
  821                 /* XXX: should not fail */
  822                 return;
  823         /* XXX grab lock first to avoid LOR */
  824         if (rt_tables[0][AF_INET6] != NULL) {
  825                 RADIX_NODE_HEAD_LOCK(rt_tables[0][AF_INET6]);
  826                 rt = rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED);
  827                 if (rt) {
  828                         if (rt->rt_ifp == ifp)
  829                                 rtexpunge(rt);
  830                         RTFREE_LOCKED(rt);
  831                 }
  832                 RADIX_NODE_HEAD_UNLOCK(rt_tables[0][AF_INET6]);
  833         }
  834 }
  835 
  836 int
  837 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf,
  838     const u_int8_t *baseid, int generate)
  839 {
  840         u_int8_t nullbuf[8];
  841         struct nd_ifinfo *ndi = ND_IFINFO(ifp);
  842 
  843         bzero(nullbuf, sizeof(nullbuf));
  844         if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
  845                 /* we've never created a random ID.  Create a new one. */
  846                 generate = 1;
  847         }
  848 
  849         if (generate) {
  850                 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
  851 
  852                 /* generate_tmp_ifid will update seedn and buf */
  853                 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
  854                     ndi->randomid);
  855         }
  856         bcopy(ndi->randomid, retbuf, 8);
  857 
  858         return (0);
  859 }
  860 
  861 void
  862 in6_tmpaddrtimer(void *ignored_arg)
  863 {
  864         struct nd_ifinfo *ndi;
  865         u_int8_t nullbuf[8];
  866         struct ifnet *ifp;
  867         int s = splnet();
  868 
  869         callout_reset(&in6_tmpaddrtimer_ch,
  870             (ip6_temp_preferred_lifetime - ip6_desync_factor -
  871             ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL);
  872 
  873         bzero(nullbuf, sizeof(nullbuf));
  874         for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
  875                 ndi = ND_IFINFO(ifp);
  876                 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
  877                         /*
  878                          * We've been generating a random ID on this interface.
  879                          * Create a new one.
  880                          */
  881                         (void)generate_tmp_ifid(ndi->randomseed0,
  882                             ndi->randomseed1, ndi->randomid);
  883                 }
  884         }
  885 
  886         splx(s);
  887 }
  888 
  889 static void
  890 in6_purgemaddrs(struct ifnet *ifp)
  891 {
  892         struct in6_multi *in6m;
  893         struct in6_multi *oin6m;
  894 
  895 #ifdef DIAGNOSTIC
  896         printf("%s: purging ifp %p\n", __func__, ifp);
  897 #endif
  898 
  899         IFF_LOCKGIANT(ifp);
  900         LIST_FOREACH_SAFE(in6m, &in6_multihead, in6m_entry, oin6m) {
  901                 if (in6m->in6m_ifp == ifp)
  902                         in6_delmulti(in6m);
  903         }
  904         IFF_UNLOCKGIANT(ifp);
  905 }

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