The Design and Implementation of the FreeBSD Operating System, Second Edition
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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: stable/7/sys/netinet6/in6_ifattach.c 231308 2012-02-09 21:33:44Z 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         KASSERT(ia != NULL, ("%s: ia == NULL, ifp=%p", __func__, ifp));
  484 
  485         /*
  486          * Make the link-local prefix (fe80::%link/64) as on-link.
  487          * Since we'd like to manage prefixes separately from addresses,
  488          * we make an ND6 prefix structure for the link-local prefix,
  489          * and add it to the prefix list as a never-expire prefix.
  490          * XXX: this change might affect some existing code base...
  491          */
  492         bzero(&pr0, sizeof(pr0));
  493         pr0.ndpr_ifp = ifp;
  494         /* this should be 64 at this moment. */
  495         pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
  496         pr0.ndpr_prefix = ifra.ifra_addr;
  497         /* apply the mask for safety. (nd6_prelist_add will apply it again) */
  498         for (i = 0; i < 4; i++) {
  499                 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
  500                     in6mask64.s6_addr32[i];
  501         }
  502         /*
  503          * Initialize parameters.  The link-local prefix must always be
  504          * on-link, and its lifetimes never expire.
  505          */
  506         pr0.ndpr_raf_onlink = 1;
  507         pr0.ndpr_raf_auto = 1;  /* probably meaningless */
  508         pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
  509         pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
  510         /*
  511          * Since there is no other link-local addresses, nd6_prefix_lookup()
  512          * probably returns NULL.  However, we cannot always expect the result.
  513          * For example, if we first remove the (only) existing link-local
  514          * address, and then reconfigure another one, the prefix is still
  515          * valid with referring to the old link-local address.
  516          */
  517         if (nd6_prefix_lookup(&pr0) == NULL) {
  518                 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
  519                         return (error);
  520         }
  521 
  522         return 0;
  523 }
  524 
  525 /*
  526  * ifp - must be IFT_LOOP
  527  */
  528 static int
  529 in6_ifattach_loopback(struct ifnet *ifp)
  530 {
  531         struct in6_aliasreq ifra;
  532         int error;
  533 
  534         bzero(&ifra, sizeof(ifra));
  535 
  536         /*
  537          * in6_update_ifa() does not use ifra_name, but we accurately set it
  538          * for safety.
  539          */
  540         strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
  541 
  542         ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
  543         ifra.ifra_prefixmask.sin6_family = AF_INET6;
  544         ifra.ifra_prefixmask.sin6_addr = in6mask128;
  545 
  546         /*
  547          * Always initialize ia_dstaddr (= broadcast address) to loopback
  548          * address.  Follows IPv4 practice - see in_ifinit().
  549          */
  550         ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
  551         ifra.ifra_dstaddr.sin6_family = AF_INET6;
  552         ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
  553 
  554         ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
  555         ifra.ifra_addr.sin6_family = AF_INET6;
  556         ifra.ifra_addr.sin6_addr = in6addr_loopback;
  557 
  558         /* the loopback  address should NEVER expire. */
  559         ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
  560         ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
  561 
  562         /* we don't need to perform DAD on loopback interfaces. */
  563         ifra.ifra_flags |= IN6_IFF_NODAD;
  564 
  565         /* skip registration to the prefix list. XXX should be temporary. */
  566         ifra.ifra_flags |= IN6_IFF_NOPFX;
  567 
  568         /*
  569          * We are sure that this is a newly assigned address, so we can set
  570          * NULL to the 3rd arg.
  571          */
  572         if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) {
  573                 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure "
  574                     "the loopback address on %s (errno=%d)\n",
  575                     if_name(ifp), error));
  576                 return (-1);
  577         }
  578 
  579         return 0;
  580 }
  581 
  582 /*
  583  * compute NI group address, based on the current hostname setting.
  584  * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later).
  585  *
  586  * when ifp == NULL, the caller is responsible for filling scopeid.
  587  */
  588 int
  589 in6_nigroup(struct ifnet *ifp, const char *name, int namelen,
  590     struct in6_addr *in6)
  591 {
  592         const char *p;
  593         u_char *q;
  594         MD5_CTX ctxt;
  595         u_int8_t digest[16];
  596         char l;
  597         char n[64];     /* a single label must not exceed 63 chars */
  598 
  599         if (!namelen || !name)
  600                 return -1;
  601 
  602         p = name;
  603         while (p && *p && *p != '.' && p - name < namelen)
  604                 p++;
  605         if (p - name > sizeof(n) - 1)
  606                 return -1;      /* label too long */
  607         l = p - name;
  608         strncpy(n, name, l);
  609         n[(int)l] = '\0';
  610         for (q = n; *q; q++) {
  611                 if ('A' <= *q && *q <= 'Z')
  612                         *q = *q - 'A' + 'a';
  613         }
  614 
  615         /* generate 8 bytes of pseudo-random value. */
  616         bzero(&ctxt, sizeof(ctxt));
  617         MD5Init(&ctxt);
  618         MD5Update(&ctxt, &l, sizeof(l));
  619         MD5Update(&ctxt, n, l);
  620         MD5Final(digest, &ctxt);
  621 
  622         bzero(in6, sizeof(*in6));
  623         in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL;
  624         in6->s6_addr8[11] = 2;
  625         bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3]));
  626         if (in6_setscope(in6, ifp, NULL))
  627                 return (-1); /* XXX: should not fail */
  628 
  629         return 0;
  630 }
  631 
  632 /*
  633  * XXX multiple loopback interface needs more care.  for instance,
  634  * nodelocal address needs to be configured onto only one of them.
  635  * XXX multiple link-local address case
  636  *
  637  * altifp - secondary EUI64 source
  638  */
  639 void
  640 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp)
  641 {
  642         struct in6_ifaddr *ia;
  643         struct in6_addr in6;
  644 
  645         /* some of the interfaces are inherently not IPv6 capable */
  646         switch (ifp->if_type) {
  647         case IFT_PFLOG:
  648         case IFT_PFSYNC:
  649         case IFT_CARP:
  650                 return;
  651         }
  652 
  653         /*
  654          * quirks based on interface type
  655          */
  656         switch (ifp->if_type) {
  657 #ifdef IFT_STF
  658         case IFT_STF:
  659                 /*
  660                  * 6to4 interface is a very special kind of beast.
  661                  * no multicast, no linklocal.  RFC2529 specifies how to make
  662                  * linklocals for 6to4 interface, but there's no use and
  663                  * it is rather harmful to have one.
  664                  */
  665                 goto statinit;
  666 #endif
  667         default:
  668                 break;
  669         }
  670 
  671         /*
  672          * usually, we require multicast capability to the interface
  673          */
  674         if ((ifp->if_flags & IFF_MULTICAST) == 0) {
  675                 nd6log((LOG_INFO, "in6_ifattach: "
  676                     "%s is not multicast capable, IPv6 not enabled\n",
  677                     if_name(ifp)));
  678                 return;
  679         }
  680 
  681         /*
  682          * assign loopback address for loopback interface.
  683          * XXX multiple loopback interface case.
  684          */
  685         if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
  686                 in6 = in6addr_loopback;
  687                 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) {
  688                         if (in6_ifattach_loopback(ifp) != 0)
  689                                 return;
  690                 }
  691         }
  692 
  693         /*
  694          * assign a link-local address, if there's none.
  695          */
  696         if (ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) {
  697                 ia = in6ifa_ifpforlinklocal(ifp, 0);
  698                 if (ia == NULL) {
  699                         if (in6_ifattach_linklocal(ifp, altifp) == 0) {
  700                                 /* linklocal address assigned */
  701                         } else {
  702                                 /* failed to assign linklocal address. bark? */
  703                         }
  704                 }
  705         }
  706 
  707 #ifdef IFT_STF                  /* XXX */
  708 statinit:
  709 #endif
  710 
  711         /* update dynamically. */
  712         if (in6_maxmtu < ifp->if_mtu)
  713                 in6_maxmtu = ifp->if_mtu;
  714 }
  715 
  716 /*
  717  * NOTE: in6_ifdetach() does not support loopback if at this moment.
  718  * We don't need this function in bsdi, because interfaces are never removed
  719  * from the ifnet list in bsdi.
  720  */
  721 void
  722 in6_ifdetach(struct ifnet *ifp)
  723 {
  724         struct in6_ifaddr *ia, *oia;
  725         struct ifaddr *ifa, *next;
  726         struct rtentry *rt;
  727         short rtflags;
  728         struct sockaddr_in6 sin6;
  729         struct in6_multi_mship *imm;
  730 
  731         /* remove neighbor management table */
  732         nd6_purge(ifp);
  733 
  734         /* nuke any of IPv6 addresses we have */
  735         for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) {
  736                 next = ifa->ifa_list.tqe_next;
  737                 if (ifa->ifa_addr->sa_family != AF_INET6)
  738                         continue;
  739                 in6_purgeaddr(ifa);
  740         }
  741 
  742         /* undo everything done by in6_ifattach(), just in case */
  743         for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) {
  744                 next = ifa->ifa_list.tqe_next;
  745 
  746                 if (ifa->ifa_addr->sa_family != AF_INET6
  747                  || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
  748                         continue;
  749                 }
  750 
  751                 ia = (struct in6_ifaddr *)ifa;
  752 
  753                 /*
  754                  * leave from multicast groups we have joined for the interface
  755                  */
  756                 while ((imm = ia->ia6_memberships.lh_first) != NULL) {
  757                         LIST_REMOVE(imm, i6mm_chain);
  758                         in6_leavegroup(imm);
  759                 }
  760 
  761                 /* remove from the routing table */
  762                 if ((ia->ia_flags & IFA_ROUTE) &&
  763                     (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) {
  764                         rtflags = rt->rt_flags;
  765                         RTFREE_LOCKED(rt);
  766                         rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr,
  767                             (struct sockaddr *)&ia->ia_addr,
  768                             (struct sockaddr *)&ia->ia_prefixmask,
  769                             rtflags, (struct rtentry **)0);
  770                 }
  771 
  772                 /* remove from the linked list */
  773                 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list);
  774                 IFAFREE(&ia->ia_ifa);
  775 
  776                 /* also remove from the IPv6 address chain(itojun&jinmei) */
  777                 oia = ia;
  778                 if (oia == (ia = in6_ifaddr))
  779                         in6_ifaddr = ia->ia_next;
  780                 else {
  781                         while (ia->ia_next && (ia->ia_next != oia))
  782                                 ia = ia->ia_next;
  783                         if (ia->ia_next)
  784                                 ia->ia_next = oia->ia_next;
  785                         else {
  786                                 nd6log((LOG_ERR,
  787                                     "%s: didn't unlink in6ifaddr from list\n",
  788                                     if_name(ifp)));
  789                         }
  790                 }
  791 
  792                 IFAFREE(&oia->ia_ifa);
  793         }
  794 
  795         in6_pcbpurgeif0(&udbinfo, ifp);
  796         in6_pcbpurgeif0(&ripcbinfo, ifp);
  797         /* leave from all multicast groups joined */
  798         in6_purgemaddrs(ifp);
  799 
  800         /*
  801          * remove neighbor management table.  we call it twice just to make
  802          * sure we nuke everything.  maybe we need just one call.
  803          * XXX: since the first call did not release addresses, some prefixes
  804          * might remain.  We should call nd6_purge() again to release the
  805          * prefixes after removing all addresses above.
  806          * (Or can we just delay calling nd6_purge until at this point?)
  807          */
  808         nd6_purge(ifp);
  809 
  810         /* remove route to link-local allnodes multicast (ff02::1) */
  811         bzero(&sin6, sizeof(sin6));
  812         sin6.sin6_len = sizeof(struct sockaddr_in6);
  813         sin6.sin6_family = AF_INET6;
  814         sin6.sin6_addr = in6addr_linklocal_allnodes;
  815         if (in6_setscope(&sin6.sin6_addr, ifp, NULL))
  816                 /* XXX: should not fail */
  817                 return;
  818         /* XXX grab lock first to avoid LOR */
  819         if (rt_tables[0][AF_INET6] != NULL) {
  820                 RADIX_NODE_HEAD_LOCK(rt_tables[0][AF_INET6]);
  821                 rt = rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED);
  822                 if (rt) {
  823                         if (rt->rt_ifp == ifp)
  824                                 rtexpunge(rt);
  825                         RTFREE_LOCKED(rt);
  826                 }
  827                 RADIX_NODE_HEAD_UNLOCK(rt_tables[0][AF_INET6]);
  828         }
  829 }
  830 
  831 int
  832 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf,
  833     const u_int8_t *baseid, int generate)
  834 {
  835         u_int8_t nullbuf[8];
  836         struct nd_ifinfo *ndi = ND_IFINFO(ifp);
  837 
  838         bzero(nullbuf, sizeof(nullbuf));
  839         if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
  840                 /* we've never created a random ID.  Create a new one. */
  841                 generate = 1;
  842         }
  843 
  844         if (generate) {
  845                 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
  846 
  847                 /* generate_tmp_ifid will update seedn and buf */
  848                 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
  849                     ndi->randomid);
  850         }
  851         bcopy(ndi->randomid, retbuf, 8);
  852 
  853         return (0);
  854 }
  855 
  856 void
  857 in6_tmpaddrtimer(void *ignored_arg)
  858 {
  859         struct nd_ifinfo *ndi;
  860         u_int8_t nullbuf[8];
  861         struct ifnet *ifp;
  862         int s = splnet();
  863 
  864         callout_reset(&in6_tmpaddrtimer_ch,
  865             (ip6_temp_preferred_lifetime - ip6_desync_factor -
  866             ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL);
  867 
  868         bzero(nullbuf, sizeof(nullbuf));
  869         for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
  870                 ndi = ND_IFINFO(ifp);
  871                 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
  872                         /*
  873                          * We've been generating a random ID on this interface.
  874                          * Create a new one.
  875                          */
  876                         (void)generate_tmp_ifid(ndi->randomseed0,
  877                             ndi->randomseed1, ndi->randomid);
  878                 }
  879         }
  880 
  881         splx(s);
  882 }
  883 
  884 static void
  885 in6_purgemaddrs(struct ifnet *ifp)
  886 {
  887         struct in6_multi *in6m;
  888         struct in6_multi *oin6m;
  889 
  890 #ifdef DIAGNOSTIC
  891         printf("%s: purging ifp %p\n", __func__, ifp);
  892 #endif
  893 
  894         IFF_LOCKGIANT(ifp);
  895         LIST_FOREACH_SAFE(in6m, &in6_multihead, in6m_entry, oin6m) {
  896                 if (in6m->in6m_ifp == ifp)
  897                         in6_delmulti(in6m);
  898         }
  899         IFF_UNLOCKGIANT(ifp);
  900 }

Cache object: f6a93dfb83cf25f0e4d36278b1de2863


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