FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6_ifattach.c

     /*      $FreeBSD$       */
     /*      $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $  */
     
     /*
      * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the project nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/malloc.h>
    #include <sys/socket.h>
    #include <sys/sockio.h>
    #include <sys/kernel.h>
    #include <sys/syslog.h>
    #include <sys/md5.h>
    
    #include <net/if.h>
    #include <net/if_dl.h>
    #include <net/if_types.h>
    #include <net/route.h>
    
    #include <netinet/in.h>
    #include <netinet/in_var.h>
    #include <netinet/if_ether.h>
    #include <netinet/in_pcb.h>
    
    #include <netinet/ip6.h>
    #include <netinet6/ip6_var.h>
    #include <netinet6/in6_var.h>
    #include <netinet6/in6_pcb.h>
    #include <netinet6/in6_ifattach.h>
    #include <netinet6/ip6_var.h>
    #include <netinet6/nd6.h>
    #include <netinet6/scope6_var.h>
    
    #include <net/net_osdep.h>
    
    struct in6_ifstat **in6_ifstat = NULL;
    struct icmp6_ifstat **icmp6_ifstat = NULL;
    size_t in6_ifstatmax = 0;
    size_t icmp6_ifstatmax = 0;
    unsigned long in6_maxmtu = 0;
    
    #ifdef IP6_AUTO_LINKLOCAL
    int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL;
    #else
    int ip6_auto_linklocal = 1;     /* enable by default */
    #endif
    
    struct callout in6_tmpaddrtimer_ch;
    
    extern struct inpcbinfo udbinfo;
    extern struct inpcbinfo ripcbinfo;
    
    static int get_rand_ifid __P((struct ifnet *, struct in6_addr *));
    static int generate_tmp_ifid __P((u_int8_t *, const u_int8_t *, u_int8_t *));
    static int get_hw_ifid __P((struct ifnet *, struct in6_addr *));
    static int get_ifid __P((struct ifnet *, struct ifnet *, struct in6_addr *));
    static int in6_ifattach_linklocal __P((struct ifnet *, struct ifnet *));
    static int in6_ifattach_loopback __P((struct ifnet *));
    
    #define EUI64_GBIT      0x01
    #define EUI64_UBIT      0x02
    #define EUI64_TO_IFID(in6)      do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
    #define EUI64_GROUP(in6)        ((in6)->s6_addr[8] & EUI64_GBIT)
    #define EUI64_INDIVIDUAL(in6)   (!EUI64_GROUP(in6))
    #define EUI64_LOCAL(in6)        ((in6)->s6_addr[8] & EUI64_UBIT)
    #define EUI64_UNIVERSAL(in6)    (!EUI64_LOCAL(in6))
    
    #define IFID_LOCAL(in6)         (!EUI64_LOCAL(in6))
    #define IFID_UNIVERSAL(in6)     (!EUI64_UNIVERSAL(in6))
    
    /*
     * Generate a last-resort interface identifier, when the machine has no
    * IEEE802/EUI64 address sources.
    * The goal here is to get an interface identifier that is
    * (1) random enough and (2) does not change across reboot.
    * We currently use MD5(hostname) for it.
    */
   static int
   get_rand_ifid(ifp, in6)
           struct ifnet *ifp;
           struct in6_addr *in6;   /* upper 64bits are preserved */
   {
           MD5_CTX ctxt;
           u_int8_t digest[16];
           int hostnamelen = strlen(hostname);
   
   #if 0
           /* we need at least several letters as seed for ifid */
           if (hostnamelen < 3)
                   return -1;
   #endif
   
           /* generate 8 bytes of pseudo-random value. */
           bzero(&ctxt, sizeof(ctxt));
           MD5Init(&ctxt);
           MD5Update(&ctxt, hostname, hostnamelen);
           MD5Final(digest, &ctxt);
   
           /* assumes sizeof(digest) > sizeof(ifid) */
           bcopy(digest, &in6->s6_addr[8], 8);
   
           /* make sure to set "u" bit to local, and "g" bit to individual. */
           in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
           in6->s6_addr[8] |= EUI64_UBIT;  /* u bit to "local" */
   
           /* convert EUI64 into IPv6 interface identifier */
           EUI64_TO_IFID(in6);
   
           return 0;
   }
   
   static int
   generate_tmp_ifid(seed0, seed1, ret)
           u_int8_t *seed0, *ret;
           const u_int8_t *seed1;
   {
           MD5_CTX ctxt;
           u_int8_t seed[16], digest[16], nullbuf[8];
           u_int32_t val32;
           struct timeval tv;
   
           /* If there's no hisotry, start with a random seed. */
           bzero(nullbuf, sizeof(nullbuf));
           if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
                   int i;
   
                   for (i = 0; i < 2; i++) {
                           microtime(&tv);
                           val32 = random() ^ tv.tv_usec;
                           bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32));
                   }
           } else {
                   bcopy(seed0, seed, 8);
           }
   
           /* copy the right-most 64-bits of the given address */
           /* XXX assumption on the size of IFID */
           bcopy(seed1, &seed[8], 8);
   
           if (0) {                /* for debugging purposes only */
                   int i;
   
                   printf("generate_tmp_ifid: new randomized ID from: ");
                   for (i = 0; i < 16; i++)
                           printf("%02x", seed[i]);
                   printf(" ");
           }
   
           /* generate 16 bytes of pseudo-random value. */
           bzero(&ctxt, sizeof(ctxt));
           MD5Init(&ctxt);
           MD5Update(&ctxt, seed, sizeof(seed));
           MD5Final(digest, &ctxt);
   
           /*
            * RFC 3041 3.2.1. (3)
            * Take the left-most 64-bits of the MD5 digest and set bit 6 (the
            * left-most bit is numbered 0) to zero.
            */
           bcopy(digest, ret, 8);
           ret[0] &= ~EUI64_UBIT;
   
           /*
            * XXX: we'd like to ensure that the generated value is not zero
            * for simplicity.  If the caclculated digest happens to be zero,
            * use a random non-zero value as the last resort.
            */
           if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) {
                   log(LOG_INFO,
                       "generate_tmp_ifid: computed MD5 value is zero.\n");
   
                   microtime(&tv);
                   val32 = random() ^ tv.tv_usec;
                   val32 = 1 + (val32 % (0xffffffff - 1));
           }
   
           /*
            * RFC 3041 3.2.1. (4)
            * Take the rightmost 64-bits of the MD5 digest and save them in
            * stable storage as the history value to be used in the next
            * iteration of the algorithm. 
            */
           bcopy(&digest[8], seed0, 8);
   
           if (0) {                /* for debugging purposes only */
                   int i;
   
                   printf("to: ");
                   for (i = 0; i < 16; i++)
                           printf("%02x", digest[i]);
                   printf("\n");
           }
   
           return 0;
   }
   
   /*
    * Get interface identifier for the specified interface.
    * XXX assumes single sockaddr_dl (AF_LINK address) per an interface
    */
   static int
   get_hw_ifid(ifp, in6)
           struct ifnet *ifp;
           struct in6_addr *in6;   /* upper 64bits are preserved */
   {
           struct ifaddr *ifa;
           struct sockaddr_dl *sdl;
           u_int8_t *addr;
           size_t addrlen;
           static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
           static u_int8_t allone[8] =
                   { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
   
           for (ifa = ifp->if_addrlist.tqh_first;
                ifa;
                ifa = ifa->ifa_list.tqe_next)
           {
                   if (ifa->ifa_addr->sa_family != AF_LINK)
                           continue;
                   sdl = (struct sockaddr_dl *)ifa->ifa_addr;
                   if (sdl == NULL)
                           continue;
                   if (sdl->sdl_alen == 0)
                           continue;
   
                   goto found;
           }
   
           return -1;
   
   found:
           addr = LLADDR(sdl);
           addrlen = sdl->sdl_alen;
   
           /* get EUI64 */
           switch (ifp->if_type) {
           case IFT_ETHER:
           case IFT_FDDI:
           case IFT_ATM:
           case IFT_IEEE1394:
   #ifdef IFT_IEEE80211
           case IFT_IEEE80211:
   #endif
                   /* IEEE802/EUI64 cases - what others? */
                   /* IEEE1394 uses 16byte length address starting with EUI64 */
                   if (addrlen > 8)
                           addrlen = 8;
   
                   /* look at IEEE802/EUI64 only */
                   if (addrlen != 8 && addrlen != 6)
                           return -1;
   
                   /*
                    * check for invalid MAC address - on bsdi, we see it a lot
                    * since wildboar configures all-zero MAC on pccard before
                    * card insertion.
                    */
                   if (bcmp(addr, allzero, addrlen) == 0)
                           return -1;
                   if (bcmp(addr, allone, addrlen) == 0)
                           return -1;
   
                   /* make EUI64 address */
                   if (addrlen == 8)
                           bcopy(addr, &in6->s6_addr[8], 8);
                   else if (addrlen == 6) {
                           in6->s6_addr[8] = addr[0];
                           in6->s6_addr[9] = addr[1];
                           in6->s6_addr[10] = addr[2];
                           in6->s6_addr[11] = 0xff;
                           in6->s6_addr[12] = 0xfe;
                           in6->s6_addr[13] = addr[3];
                           in6->s6_addr[14] = addr[4];
                           in6->s6_addr[15] = addr[5];
                   }
                   break;
   
           case IFT_ARCNET:
                   if (addrlen != 1)
                           return -1;
                   if (!addr[0])
                           return -1;
   
                   bzero(&in6->s6_addr[8], 8);
                   in6->s6_addr[15] = addr[0];
   
                   /*
                    * due to insufficient bitwidth, we mark it local.
                    */
                   in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
                   in6->s6_addr[8] |= EUI64_UBIT;  /* u bit to "local" */
                   break;
   
           case IFT_GIF:
   #ifdef IFT_STF
           case IFT_STF:
   #endif
                   /*
                    * RFC2893 says: "SHOULD use IPv4 address as ifid source".
                    * however, IPv4 address is not very suitable as unique
                    * identifier source (can be renumbered).
                    * we don't do this.
                    */
                   return -1;
   
           default:
                   return -1;
           }
   
           /* sanity check: g bit must not indicate "group" */
           if (EUI64_GROUP(in6))
                   return -1;
   
           /* convert EUI64 into IPv6 interface identifier */
           EUI64_TO_IFID(in6);
   
           /*
            * sanity check: ifid must not be all zero, avoid conflict with
            * subnet router anycast
            */
           if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
               bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
                   return -1;
           }
   
           return 0;
   }
   
   /*
    * Get interface identifier for the specified interface.  If it is not
    * available on ifp0, borrow interface identifier from other information
    * sources.
    */
   static int
   get_ifid(ifp0, altifp, in6)
           struct ifnet *ifp0;
           struct ifnet *altifp;   /* secondary EUI64 source */
           struct in6_addr *in6;
   {
           struct ifnet *ifp;
   
           /* first, try to get it from the interface itself */
           if (get_hw_ifid(ifp0, in6) == 0) {
                   nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
                       if_name(ifp0)));
                   goto success;
           }
   
           /* try secondary EUI64 source. this basically is for ATM PVC */
           if (altifp && get_hw_ifid(altifp, in6) == 0) {
                   nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
                       if_name(ifp0), if_name(altifp)));
                   goto success;
           }
   
           /* next, try to get it from some other hardware interface */
           for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next)
           {
                   if (ifp == ifp0)
                           continue;
                   if (get_hw_ifid(ifp, in6) != 0)
                           continue;
   
                   /*
                    * to borrow ifid from other interface, ifid needs to be
                    * globally unique
                    */
                   if (IFID_UNIVERSAL(in6)) {
                           nd6log((LOG_DEBUG,
                               "%s: borrow interface identifier from %s\n",
                               if_name(ifp0), if_name(ifp)));
                           goto success;
                   }
           }
   
           /* last resort: get from random number source */
           if (get_rand_ifid(ifp, in6) == 0) {
                   nd6log((LOG_DEBUG,
                       "%s: interface identifier generated by random number\n",
                       if_name(ifp0)));
                   goto success;
           }
   
           printf("%s: failed to get interface identifier\n", if_name(ifp0));
           return -1;
   
   success:
           nd6log((LOG_INFO, "%s: ifid: "
                   "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
                   if_name(ifp0),
                   in6->s6_addr[8], in6->s6_addr[9],
                   in6->s6_addr[10], in6->s6_addr[11],
                   in6->s6_addr[12], in6->s6_addr[13],
                   in6->s6_addr[14], in6->s6_addr[15]));
           return 0;
   }
   
   static int
   in6_ifattach_linklocal(ifp, altifp)
           struct ifnet *ifp;
           struct ifnet *altifp;   /* secondary EUI64 source */
   {
           struct in6_ifaddr *ia;
           struct in6_aliasreq ifra;
           struct nd_prefix pr0;
           int i, error;
   
           /*
            * configure link-local address.
            */
           bzero(&ifra, sizeof(ifra));
   
           /*
            * in6_update_ifa() does not use ifra_name, but we accurately set it
            * for safety.
            */
           strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
   
           ifra.ifra_addr.sin6_family = AF_INET6;
           ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
           ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80);
   #ifdef SCOPEDROUTING
           ifra.ifra_addr.sin6_addr.s6_addr16[1] = 0
   #else
           ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); /* XXX */
   #endif
           ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
           if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
                   ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
                   ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
           } else {
                   if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
                           nd6log((LOG_ERR,
                               "%s: no ifid available\n", if_name(ifp)));
                           return -1;
                   }
           }
   #ifdef SCOPEDROUTING
           ifra.ifra_addr.sin6_scope_id =
                   in6_addr2scopeid(ifp,  &ifra.ifra_addr.sin6_addr);
   #endif
   
           ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
           ifra.ifra_prefixmask.sin6_family = AF_INET6;
           ifra.ifra_prefixmask.sin6_addr = in6mask64;
   #ifdef SCOPEDROUTING
           /* take into accound the sin6_scope_id field for routing */
           ifra.ifra_prefixmask.sin6_scope_id = 0xffffffff;
   #endif
           /* link-local addresses should NEVER expire. */
           ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
           ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
   
           /*
            * Do not let in6_update_ifa() do DAD, since we need a random delay
            * before sending an NS at the first time the interface becomes up.
            * Instead, in6_if_up() will start DAD with a proper random delay.
            */
           ifra.ifra_flags |= IN6_IFF_NODAD;
   
           /*
            * Now call in6_update_ifa() to do a bunch of procedures to configure
            * a link-local address. We can set NULL to the 3rd argument, because
            * we know there's no other link-local address on the interface
            * and therefore we are adding one (instead of updating one).
            */
           if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
                   /*
                    * XXX: When the interface does not support IPv6, this call
                    * would fail in the SIOCSIFADDR ioctl.  I believe the
                    * notification is rather confusing in this case, so just
                    * supress it.  (jinmei@kame.net 20010130)
                    */
                   if (error != EAFNOSUPPORT)
                           log(LOG_NOTICE, "in6_ifattach_linklocal: failed to "
                               "configure a link-local address on %s "
                               "(errno=%d)\n",
                               if_name(ifp), error);
                   return(-1);
           }
   
           /*
            * Adjust ia6_flags so that in6_if_up will perform DAD.
            * XXX: Some P2P interfaces seem not to send packets just after
            * becoming up, so we skip p2p interfaces for safety.
            */
           ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
   #ifdef DIAGNOSTIC
           if (!ia) {
                   panic("ia == NULL in in6_ifattach_linklocal");
                   /* NOTREACHED */
           }
   #endif
           if (in6if_do_dad(ifp) && (ifp->if_flags & IFF_POINTOPOINT) == 0) {
                   ia->ia6_flags &= ~IN6_IFF_NODAD;
                   ia->ia6_flags |= IN6_IFF_TENTATIVE;
           }
   
           /*
            * Make the link-local prefix (fe80::/64%link) as on-link.
            * Since we'd like to manage prefixes separately from addresses,
            * we make an ND6 prefix structure for the link-local prefix,
            * and add it to the prefix list as a never-expire prefix.
            * XXX: this change might affect some existing code base...
            */
           bzero(&pr0, sizeof(pr0));
           pr0.ndpr_ifp = ifp;
           /* this should be 64 at this moment. */
           pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
           pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr;
           pr0.ndpr_prefix = ifra.ifra_addr;
           /* apply the mask for safety. (nd6_prelist_add will apply it again) */
           for (i = 0; i < 4; i++) {
                   pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
                           in6mask64.s6_addr32[i];
           }
           /*
            * Initialize parameters.  The link-local prefix must always be
            * on-link, and its lifetimes never expire.
            */
           pr0.ndpr_raf_onlink = 1;
           pr0.ndpr_raf_auto = 1;  /* probably meaningless */
           pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
           pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
           /*
            * Since there is no other link-local addresses, nd6_prefix_lookup()
            * probably returns NULL.  However, we cannot always expect the result.
            * For example, if we first remove the (only) existing link-local
            * address, and then reconfigure another one, the prefix is still
            * valid with referring to the old link-local address.
            */
           if (nd6_prefix_lookup(&pr0) == NULL) {
                   if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
                           return(error);
           }
   
           return 0;
   }
   
   static int
   in6_ifattach_loopback(ifp)
           struct ifnet *ifp;      /* must be IFT_LOOP */
   {
           struct in6_aliasreq ifra;
           int error;
   
           bzero(&ifra, sizeof(ifra));
   
           /*
            * in6_update_ifa() does not use ifra_name, but we accurately set it
            * for safety.
            */
           strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
   
           ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
           ifra.ifra_prefixmask.sin6_family = AF_INET6;
           ifra.ifra_prefixmask.sin6_addr = in6mask128;
   
           /*
            * Always initialize ia_dstaddr (= broadcast address) to loopback
            * address.  Follows IPv4 practice - see in_ifinit().
            */
           ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
           ifra.ifra_dstaddr.sin6_family = AF_INET6;
           ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
   
           ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
           ifra.ifra_addr.sin6_family = AF_INET6;
           ifra.ifra_addr.sin6_addr = in6addr_loopback;
   
           /* the loopback  address should NEVER expire. */
           ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
           ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
   
           /* we don't need to perform DAD on loopback interfaces. */
           ifra.ifra_flags |= IN6_IFF_NODAD;
   
           /* skip registration to the prefix list. XXX should be temporary. */
           ifra.ifra_flags |= IN6_IFF_NOPFX;
   
           /*
            * We are sure that this is a newly assigned address, so we can set
            * NULL to the 3rd arg.
            */
           if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
                   log(LOG_ERR, "in6_ifattach_loopback: failed to configure "
                       "the loopback address on %s (errno=%d)\n",
                       if_name(ifp), error);
                   return(-1);
           }
   
           return 0;
   }
   
   /*
    * compute NI group address, based on the current hostname setting.
    * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later).
    *
    * when ifp == NULL, the caller is responsible for filling scopeid.
    */
   int
   in6_nigroup(ifp, name, namelen, in6)
           struct ifnet *ifp;
           const char *name;
           int namelen;
           struct in6_addr *in6;
   {
           const char *p;
           u_char *q;
           MD5_CTX ctxt;
           u_int8_t digest[16];
           char l;
           char n[64];     /* a single label must not exceed 63 chars */
   
           if (!namelen || !name)
                   return -1;
   
           p = name;
           while (p && *p && *p != '.' && p - name < namelen)
                   p++;
           if (p - name > sizeof(n) - 1)
                   return -1;      /* label too long */
           l = p - name;
           strncpy(n, name, l);
           n[(int)l] = '\0';
           for (q = n; *q; q++) {
                   if ('A' <= *q && *q <= 'Z')
                           *q = *q - 'A' + 'a';
           }
   
           /* generate 8 bytes of pseudo-random value. */
           bzero(&ctxt, sizeof(ctxt));
           MD5Init(&ctxt);
           MD5Update(&ctxt, &l, sizeof(l));
           MD5Update(&ctxt, n, l);
           MD5Final(digest, &ctxt);
   
           bzero(in6, sizeof(*in6));
           in6->s6_addr16[0] = htons(0xff02);
           if (ifp)
                   in6->s6_addr16[1] = htons(ifp->if_index);
           in6->s6_addr8[11] = 2;
           bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3]));
   
           return 0;
   }
   
   void
   in6_nigroup_attach(name, namelen)
           const char *name;
           int namelen;
   {
           struct ifnet *ifp;
           struct sockaddr_in6 mltaddr;
           struct in6_multi *in6m;
           int error;
   
           bzero(&mltaddr, sizeof(mltaddr));
           mltaddr.sin6_family = AF_INET6;
           mltaddr.sin6_len = sizeof(struct sockaddr_in6);
           if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0)
                   return;
   
           for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next)
           {
                   mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
                   IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m);
                   if (!in6m) {
                           if (!in6_addmulti(&mltaddr.sin6_addr, ifp, &error)) {
                                   nd6log((LOG_ERR, "%s: failed to join %s "
                                       "(errno=%d)\n", if_name(ifp),
                                       ip6_sprintf(&mltaddr.sin6_addr), 
                                       error));
                           }
                   }
           }
   }
   
   void
   in6_nigroup_detach(name, namelen)
           const char *name;
           int namelen;
   {
           struct ifnet *ifp;
           struct sockaddr_in6 mltaddr;
           struct in6_multi *in6m;
   
           bzero(&mltaddr, sizeof(mltaddr));
           mltaddr.sin6_family = AF_INET6;
           mltaddr.sin6_len = sizeof(struct sockaddr_in6);
           if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0)
                   return;
   
           for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next)
           {
                   mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
                   IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m);
                   if (in6m)
                           in6_delmulti(in6m);
           }
   }
   
   /*
    * XXX multiple loopback interface needs more care.  for instance,
    * nodelocal address needs to be configured onto only one of them.
    * XXX multiple link-local address case
    */
   void
   in6_ifattach(ifp, altifp)
           struct ifnet *ifp;
           struct ifnet *altifp;   /* secondary EUI64 source */
   {
           static size_t if_indexlim = 8;
           struct in6_ifaddr *ia;
           struct in6_addr in6;
   
           /* some of the interfaces are inherently not IPv6 capable */
           switch (ifp->if_type) {
   #ifdef IFT_BRIDGE       /*OpenBSD 2.8*/
           case IFT_BRIDGE:
                   return;
   #endif
           }
   
           /*
            * We have some arrays that should be indexed by if_index.
            * since if_index will grow dynamically, they should grow too.
            *      struct in6_ifstat **in6_ifstat
            *      struct icmp6_ifstat **icmp6_ifstat
            */
           if (in6_ifstat == NULL || icmp6_ifstat == NULL ||
               if_index >= if_indexlim) {
                   size_t n;
                   caddr_t q;
                   size_t olim;
   
                   olim = if_indexlim;
                   while (if_index >= if_indexlim)
                           if_indexlim <<= 1;
   
                   /* grow in6_ifstat */
                   n = if_indexlim * sizeof(struct in6_ifstat *);
                   q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK);
                   bzero(q, n);
                   if (in6_ifstat) {
                           bcopy((caddr_t)in6_ifstat, q,
                                   olim * sizeof(struct in6_ifstat *));
                           free((caddr_t)in6_ifstat, M_IFADDR);
                   }
                   in6_ifstat = (struct in6_ifstat **)q;
                   in6_ifstatmax = if_indexlim;
   
                   /* grow icmp6_ifstat */
                   n = if_indexlim * sizeof(struct icmp6_ifstat *);
                   q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK);
                   bzero(q, n);
                   if (icmp6_ifstat) {
                           bcopy((caddr_t)icmp6_ifstat, q,
                                   olim * sizeof(struct icmp6_ifstat *));
                           free((caddr_t)icmp6_ifstat, M_IFADDR);
                   }
                   icmp6_ifstat = (struct icmp6_ifstat **)q;
                   icmp6_ifstatmax = if_indexlim;
           }
   
           /* initialize scope identifiers */
           scope6_ifattach(ifp);
   
           /*
            * quirks based on interface type
            */
           switch (ifp->if_type) {
   #ifdef IFT_STF
           case IFT_STF:
                   /*
                    * 6to4 interface is a very special kind of beast.
                    * no multicast, no linklocal.  RFC2529 specifies how to make
                    * linklocals for 6to4 interface, but there's no use and
                    * it is rather harmful to have one.
                    */
                   goto statinit;
   #endif
           default:
                   break;
           }
   
           /*
            * usually, we require multicast capability to the interface
            */
           if ((ifp->if_flags & IFF_MULTICAST) == 0) {
                   log(LOG_INFO, "in6_ifattach: "
                       "%s is not multicast capable, IPv6 not enabled\n",
                       if_name(ifp));
                   return;
           }
   
           /*
            * assign loopback address for loopback interface.
            * XXX multiple loopback interface case.
            */
           if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
                   in6 = in6addr_loopback;
                   if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) {
                           if (in6_ifattach_loopback(ifp) != 0)
                                   return;
                   }
           }
   
           /*
            * assign a link-local address, if there's none. 
            */
           if (ip6_auto_linklocal) {
                   ia = in6ifa_ifpforlinklocal(ifp, 0);
                   if (ia == NULL) {
                           if (in6_ifattach_linklocal(ifp, altifp) == 0) {
                                   /* linklocal address assigned */
                           } else {
                                   /* failed to assign linklocal address. bark? */
                           }
                   }
           }
   
   #ifdef IFT_STF                  /* XXX */
   statinit:       
   #endif
   
           /* update dynamically. */
           if (in6_maxmtu < ifp->if_mtu)
                   in6_maxmtu = ifp->if_mtu;
   
           if (in6_ifstat[ifp->if_index] == NULL) {
                   in6_ifstat[ifp->if_index] = (struct in6_ifstat *)
                           malloc(sizeof(struct in6_ifstat), M_IFADDR, M_WAITOK);
                   bzero(in6_ifstat[ifp->if_index], sizeof(struct in6_ifstat));
           }
           if (icmp6_ifstat[ifp->if_index] == NULL) {
                   icmp6_ifstat[ifp->if_index] = (struct icmp6_ifstat *)
                           malloc(sizeof(struct icmp6_ifstat), M_IFADDR, M_WAITOK);
                   bzero(icmp6_ifstat[ifp->if_index], sizeof(struct icmp6_ifstat));
           }
   
           /* initialize NDP variables */
           nd6_ifattach(ifp);
   }
   
   /*
    * NOTE: in6_ifdetach() does not support loopback if at this moment.
    * We don't need this function in bsdi, because interfaces are never removed
    * from the ifnet list in bsdi.
    */
   void
   in6_ifdetach(ifp)
           struct ifnet *ifp;
   {
           struct in6_ifaddr *ia, *oia;
           struct ifaddr *ifa, *next;
           struct rtentry *rt;
           short rtflags;
           struct sockaddr_in6 sin6;
           struct in6_multi *in6m;
           struct in6_multi *in6m_next;
   
           /* nuke prefix list.  this may try to remove some of ifaddrs as well */
           in6_purgeprefix(ifp);
   
           /* remove neighbor management table */
           nd6_purge(ifp);
   
           /* nuke any of IPv6 addresses we have */
           for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next)
           {
                   next = ifa->ifa_list.tqe_next;
                   if (ifa->ifa_addr->sa_family != AF_INET6)
                           continue;
                   in6_purgeaddr(ifa);
           }
   
           /* undo everything done by in6_ifattach(), just in case */
           for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next)
           {
                   next = ifa->ifa_list.tqe_next;
   
   
                   if (ifa->ifa_addr->sa_family != AF_INET6
                    || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
                           continue;
                   }
   
                   ia = (struct in6_ifaddr *)ifa;
   
                   /* remove from the routing table */
                   if ((ia->ia_flags & IFA_ROUTE)
                    && (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) {
                           rtflags = rt->rt_flags;
                           rtfree(rt);
                           rtrequest(RTM_DELETE,
                                   (struct sockaddr *)&ia->ia_addr,
                                   (struct sockaddr *)&ia->ia_addr,
                                   (struct sockaddr *)&ia->ia_prefixmask,
                                   rtflags, (struct rtentry **)0);
                   }
   
                   /* remove from the linked list */
                   TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list);
                   IFAFREE(&ia->ia_ifa);
   
                   /* also remove from the IPv6 address chain(itojun&jinmei) */
                   oia = ia;
                   if (oia == (ia = in6_ifaddr))
                           in6_ifaddr = ia->ia_next;
                   else {
                           while (ia->ia_next && (ia->ia_next != oia))
                                   ia = ia->ia_next;
                           if (ia->ia_next)
                                   ia->ia_next = oia->ia_next;
                           else {
                                   nd6log((LOG_ERR, 
                                       "%s: didn't unlink in6ifaddr from "
                                       "list\n", if_name(ifp)));
                           }
                   }
   
                   IFAFREE(&oia->ia_ifa);
           }
   
           /* leave from all multicast groups joined */
           in6_pcbpurgeif0(LIST_FIRST(udbinfo.listhead), ifp);
           in6_pcbpurgeif0(LIST_FIRST(ripcbinfo.listhead), ifp);
           for (in6m = LIST_FIRST(&in6_multihead); in6m; in6m = in6m_next) {
                   in6m_next = LIST_NEXT(in6m, in6m_entry);
                   if (in6m->in6m_ifp != ifp)
                           continue;
                   in6_delmulti(in6m);
                   in6m = NULL;
           }
   
           /*
            * remove neighbor management table.  we call it twice just to make
            * sure we nuke everything.  maybe we need just one call.
            * XXX: since the first call did not release addresses, some prefixes
            * might remain.  We should call nd6_purge() again to release the
            * prefixes after removing all addresses above.
            * (Or can we just delay calling nd6_purge until at this point?)
            */
           nd6_purge(ifp);
   
           /* remove route to link-local allnodes multicast (ff02::1) */
           bzero(&sin6, sizeof(sin6));
           sin6.sin6_len = sizeof(struct sockaddr_in6);
           sin6.sin6_family = AF_INET6;
           sin6.sin6_addr = in6addr_linklocal_allnodes;
           sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
           rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
           if (rt && rt->rt_ifp == ifp) {
                   rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt),
                           rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0);
                   rtfree(rt);
           }
   }
   
   void
   in6_get_tmpifid(ifp, retbuf, baseid, generate)
           struct ifnet *ifp;
           u_int8_t *retbuf;
           const u_int8_t *baseid;
           int generate;
   {
           u_int8_t nullbuf[8];
           struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index];
   
           bzero(nullbuf, sizeof(nullbuf));
           if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
                  /* we've never created a random ID.  Create a new one. */
                  generate = 1;
          }
  
          if (generate) {
                  bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
  
                  /* generate_tmp_ifid will update seedn and buf */
                  (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
                                          ndi->randomid);
          }
          bcopy(ndi->randomid, retbuf, 8);
  }
  
  void
  in6_tmpaddrtimer(ignored_arg)
          void *ignored_arg;
  {
          int i;
          struct nd_ifinfo *ndi;
          u_int8_t nullbuf[8];
          int s = splnet();
  
          callout_reset(&in6_tmpaddrtimer_ch,
                        (ip6_temp_preferred_lifetime - ip6_desync_factor -
                         ip6_temp_regen_advance) * hz,
                        in6_tmpaddrtimer, NULL);
  
          bzero(nullbuf, sizeof(nullbuf));
          for (i = 1; i < if_index + 1; i++) {
                  ndi = &nd_ifinfo[i];
                  if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
                          /*
                           * We've been generating a random ID on this interface.
                           * Create a new one.
                           */
                          (void)generate_tmp_ifid(ndi->randomseed0,
                                                  ndi->randomseed1,
                                                  ndi->randomid);
                  }
          }
  
          splx(s);
  }

Cache object: 5b79fdc17eb9a10b4cf11b487c313040