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/8.3/sys/netinet6/in6_ifattach.c 231307 2012-02-09 21:33:36Z 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/jail.h>
   41 #include <sys/kernel.h>
   42 #include <sys/proc.h>
   43 #include <sys/syslog.h>
   44 #include <sys/md5.h>
   45 
   46 #include <net/if.h>
   47 #include <net/if_dl.h>
   48 #include <net/if_types.h>
   49 #include <net/route.h>
   50 #include <net/vnet.h>
   51 
   52 #include <netinet/in.h>
   53 #include <netinet/in_var.h>
   54 #include <netinet/if_ether.h>
   55 #include <netinet/in_pcb.h>
   56 #include <netinet/ip_var.h>
   57 #include <netinet/udp.h>
   58 #include <netinet/udp_var.h>
   59 
   60 #include <netinet/ip6.h>
   61 #include <netinet6/ip6_var.h>
   62 #include <netinet6/in6_var.h>
   63 #include <netinet6/in6_pcb.h>
   64 #include <netinet6/in6_ifattach.h>
   65 #include <netinet6/ip6_var.h>
   66 #include <netinet6/nd6.h>
   67 #include <netinet6/mld6_var.h>
   68 #include <netinet6/scope6_var.h>
   69 
   70 VNET_DEFINE(unsigned long, in6_maxmtu) = 0;
   71 
   72 #ifdef IP6_AUTO_LINKLOCAL
   73 VNET_DEFINE(int, ip6_auto_linklocal) = IP6_AUTO_LINKLOCAL;
   74 #else
   75 VNET_DEFINE(int, ip6_auto_linklocal) = 1;       /* enabled by default */
   76 #endif
   77 
   78 VNET_DEFINE(struct callout, in6_tmpaddrtimer_ch);
   79 #define V_in6_tmpaddrtimer_ch           VNET(in6_tmpaddrtimer_ch)
   80 
   81 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
   82 #define V_ripcbinfo                     VNET(ripcbinfo)
   83 
   84 static int get_rand_ifid(struct ifnet *, struct in6_addr *);
   85 static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *);
   86 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *);
   87 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *);
   88 static int in6_ifattach_loopback(struct ifnet *);
   89 static void in6_purgemaddrs(struct ifnet *);
   90 
   91 #define EUI64_GBIT      0x01
   92 #define EUI64_UBIT      0x02
   93 #define EUI64_TO_IFID(in6)      do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
   94 #define EUI64_GROUP(in6)        ((in6)->s6_addr[8] & EUI64_GBIT)
   95 #define EUI64_INDIVIDUAL(in6)   (!EUI64_GROUP(in6))
   96 #define EUI64_LOCAL(in6)        ((in6)->s6_addr[8] & EUI64_UBIT)
   97 #define EUI64_UNIVERSAL(in6)    (!EUI64_LOCAL(in6))
   98 
   99 #define IFID_LOCAL(in6)         (!EUI64_LOCAL(in6))
  100 #define IFID_UNIVERSAL(in6)     (!EUI64_UNIVERSAL(in6))
  101 
  102 /*
  103  * Generate a last-resort interface identifier, when the machine has no
  104  * IEEE802/EUI64 address sources.
  105  * The goal here is to get an interface identifier that is
  106  * (1) random enough and (2) does not change across reboot.
  107  * We currently use MD5(hostname) for it.
  108  *
  109  * in6 - upper 64bits are preserved
  110  */
  111 static int
  112 get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6)
  113 {
  114         MD5_CTX ctxt;
  115         struct prison *pr;
  116         u_int8_t digest[16];
  117         int hostnamelen;
  118 
  119         pr = curthread->td_ucred->cr_prison;
  120         mtx_lock(&pr->pr_mtx);
  121         hostnamelen = strlen(pr->pr_hostname);
  122 #if 0
  123         /* we need at least several letters as seed for ifid */
  124         if (hostnamelen < 3) {
  125                 mtx_unlock(&pr->pr_mtx);
  126                 return -1;
  127         }
  128 #endif
  129 
  130         /* generate 8 bytes of pseudo-random value. */
  131         bzero(&ctxt, sizeof(ctxt));
  132         MD5Init(&ctxt);
  133         MD5Update(&ctxt, pr->pr_hostname, hostnamelen);
  134         mtx_unlock(&pr->pr_mtx);
  135         MD5Final(digest, &ctxt);
  136 
  137         /* assumes sizeof(digest) > sizeof(ifid) */
  138         bcopy(digest, &in6->s6_addr[8], 8);
  139 
  140         /* make sure to set "u" bit to local, and "g" bit to individual. */
  141         in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
  142         in6->s6_addr[8] |= EUI64_UBIT;  /* u bit to "local" */
  143 
  144         /* convert EUI64 into IPv6 interface identifier */
  145         EUI64_TO_IFID(in6);
  146 
  147         return 0;
  148 }
  149 
  150 static int
  151 generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret)
  152 {
  153         MD5_CTX ctxt;
  154         u_int8_t seed[16], digest[16], nullbuf[8];
  155         u_int32_t val32;
  156 
  157         /* If there's no history, start with a random seed. */
  158         bzero(nullbuf, sizeof(nullbuf));
  159         if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
  160                 int i;
  161 
  162                 for (i = 0; i < 2; i++) {
  163                         val32 = arc4random();
  164                         bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32));
  165                 }
  166         } else
  167                 bcopy(seed0, seed, 8);
  168 
  169         /* copy the right-most 64-bits of the given address */
  170         /* XXX assumption on the size of IFID */
  171         bcopy(seed1, &seed[8], 8);
  172 
  173         if (0) {                /* for debugging purposes only */
  174                 int i;
  175 
  176                 printf("generate_tmp_ifid: new randomized ID from: ");
  177                 for (i = 0; i < 16; i++)
  178                         printf("%02x", seed[i]);
  179                 printf(" ");
  180         }
  181 
  182         /* generate 16 bytes of pseudo-random value. */
  183         bzero(&ctxt, sizeof(ctxt));
  184         MD5Init(&ctxt);
  185         MD5Update(&ctxt, seed, sizeof(seed));
  186         MD5Final(digest, &ctxt);
  187 
  188         /*
  189          * RFC 3041 3.2.1. (3)
  190          * Take the left-most 64-bits of the MD5 digest and set bit 6 (the
  191          * left-most bit is numbered 0) to zero.
  192          */
  193         bcopy(digest, ret, 8);
  194         ret[0] &= ~EUI64_UBIT;
  195 
  196         /*
  197          * XXX: we'd like to ensure that the generated value is not zero
  198          * for simplicity.  If the caclculated digest happens to be zero,
  199          * use a random non-zero value as the last resort.
  200          */
  201         if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) {
  202                 nd6log((LOG_INFO,
  203                     "generate_tmp_ifid: computed MD5 value is zero.\n"));
  204 
  205                 val32 = arc4random();
  206                 val32 = 1 + (val32 % (0xffffffff - 1));
  207         }
  208 
  209         /*
  210          * RFC 3041 3.2.1. (4)
  211          * Take the rightmost 64-bits of the MD5 digest and save them in
  212          * stable storage as the history value to be used in the next
  213          * iteration of the algorithm.
  214          */
  215         bcopy(&digest[8], seed0, 8);
  216 
  217         if (0) {                /* for debugging purposes only */
  218                 int i;
  219 
  220                 printf("to: ");
  221                 for (i = 0; i < 16; i++)
  222                         printf("%02x", digest[i]);
  223                 printf("\n");
  224         }
  225 
  226         return 0;
  227 }
  228 
  229 /*
  230  * Get interface identifier for the specified interface.
  231  * XXX assumes single sockaddr_dl (AF_LINK address) per an interface
  232  *
  233  * in6 - upper 64bits are preserved
  234  */
  235 int
  236 in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6)
  237 {
  238         struct ifaddr *ifa;
  239         struct sockaddr_dl *sdl;
  240         u_int8_t *addr;
  241         size_t addrlen;
  242         static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
  243         static u_int8_t allone[8] =
  244                 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
  245 
  246         IF_ADDR_LOCK(ifp);
  247         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  248                 if (ifa->ifa_addr->sa_family != AF_LINK)
  249                         continue;
  250                 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  251                 if (sdl == NULL)
  252                         continue;
  253                 if (sdl->sdl_alen == 0)
  254                         continue;
  255 
  256                 goto found;
  257         }
  258         IF_ADDR_UNLOCK(ifp);
  259 
  260         return -1;
  261 
  262 found:
  263         IF_ADDR_LOCK_ASSERT(ifp);
  264         addr = LLADDR(sdl);
  265         addrlen = sdl->sdl_alen;
  266 
  267         /* get EUI64 */
  268         switch (ifp->if_type) {
  269         case IFT_ETHER:
  270         case IFT_FDDI:
  271         case IFT_ISO88025:
  272         case IFT_ATM:
  273         case IFT_IEEE1394:
  274 #ifdef IFT_IEEE80211
  275         case IFT_IEEE80211:
  276 #endif
  277                 /* IEEE802/EUI64 cases - what others? */
  278                 /* IEEE1394 uses 16byte length address starting with EUI64 */
  279                 if (addrlen > 8)
  280                         addrlen = 8;
  281 
  282                 /* look at IEEE802/EUI64 only */
  283                 if (addrlen != 8 && addrlen != 6) {
  284                         IF_ADDR_UNLOCK(ifp);
  285                         return -1;
  286                 }
  287 
  288                 /*
  289                  * check for invalid MAC address - on bsdi, we see it a lot
  290                  * since wildboar configures all-zero MAC on pccard before
  291                  * card insertion.
  292                  */
  293                 if (bcmp(addr, allzero, addrlen) == 0) {
  294                         IF_ADDR_UNLOCK(ifp);
  295                         return -1;
  296                 }
  297                 if (bcmp(addr, allone, addrlen) == 0) {
  298                         IF_ADDR_UNLOCK(ifp);
  299                         return -1;
  300                 }
  301 
  302                 /* make EUI64 address */
  303                 if (addrlen == 8)
  304                         bcopy(addr, &in6->s6_addr[8], 8);
  305                 else if (addrlen == 6) {
  306                         in6->s6_addr[8] = addr[0];
  307                         in6->s6_addr[9] = addr[1];
  308                         in6->s6_addr[10] = addr[2];
  309                         in6->s6_addr[11] = 0xff;
  310                         in6->s6_addr[12] = 0xfe;
  311                         in6->s6_addr[13] = addr[3];
  312                         in6->s6_addr[14] = addr[4];
  313                         in6->s6_addr[15] = addr[5];
  314                 }
  315                 break;
  316 
  317         case IFT_ARCNET:
  318                 if (addrlen != 1) {
  319                         IF_ADDR_UNLOCK(ifp);
  320                         return -1;
  321                 }
  322                 if (!addr[0]) {
  323                         IF_ADDR_UNLOCK(ifp);
  324                         return -1;
  325                 }
  326 
  327                 bzero(&in6->s6_addr[8], 8);
  328                 in6->s6_addr[15] = addr[0];
  329 
  330                 /*
  331                  * due to insufficient bitwidth, we mark it local.
  332                  */
  333                 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
  334                 in6->s6_addr[8] |= EUI64_UBIT;  /* u bit to "local" */
  335                 break;
  336 
  337         case IFT_GIF:
  338 #ifdef IFT_STF
  339         case IFT_STF:
  340 #endif
  341                 /*
  342                  * RFC2893 says: "SHOULD use IPv4 address as ifid source".
  343                  * however, IPv4 address is not very suitable as unique
  344                  * identifier source (can be renumbered).
  345                  * we don't do this.
  346                  */
  347                 IF_ADDR_UNLOCK(ifp);
  348                 return -1;
  349 
  350         default:
  351                 IF_ADDR_UNLOCK(ifp);
  352                 return -1;
  353         }
  354 
  355         /* sanity check: g bit must not indicate "group" */
  356         if (EUI64_GROUP(in6)) {
  357                 IF_ADDR_UNLOCK(ifp);
  358                 return -1;
  359         }
  360 
  361         /* convert EUI64 into IPv6 interface identifier */
  362         EUI64_TO_IFID(in6);
  363 
  364         /*
  365          * sanity check: ifid must not be all zero, avoid conflict with
  366          * subnet router anycast
  367          */
  368         if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
  369             bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
  370                 IF_ADDR_UNLOCK(ifp);
  371                 return -1;
  372         }
  373 
  374         IF_ADDR_UNLOCK(ifp);
  375         return 0;
  376 }
  377 
  378 /*
  379  * Get interface identifier for the specified interface.  If it is not
  380  * available on ifp0, borrow interface identifier from other information
  381  * sources.
  382  *
  383  * altifp - secondary EUI64 source
  384  */
  385 static int
  386 get_ifid(struct ifnet *ifp0, struct ifnet *altifp,
  387     struct in6_addr *in6)
  388 {
  389         struct ifnet *ifp;
  390 
  391         /* first, try to get it from the interface itself */
  392         if (in6_get_hw_ifid(ifp0, in6) == 0) {
  393                 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
  394                     if_name(ifp0)));
  395                 goto success;
  396         }
  397 
  398         /* try secondary EUI64 source. this basically is for ATM PVC */
  399         if (altifp && in6_get_hw_ifid(altifp, in6) == 0) {
  400                 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
  401                     if_name(ifp0), if_name(altifp)));
  402                 goto success;
  403         }
  404 
  405         /* next, try to get it from some other hardware interface */
  406         IFNET_RLOCK_NOSLEEP();
  407         for (ifp = V_ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) {
  408                 if (ifp == ifp0)
  409                         continue;
  410                 if (in6_get_hw_ifid(ifp, in6) != 0)
  411                         continue;
  412 
  413                 /*
  414                  * to borrow ifid from other interface, ifid needs to be
  415                  * globally unique
  416                  */
  417                 if (IFID_UNIVERSAL(in6)) {
  418                         nd6log((LOG_DEBUG,
  419                             "%s: borrow interface identifier from %s\n",
  420                             if_name(ifp0), if_name(ifp)));
  421                         IFNET_RUNLOCK_NOSLEEP();
  422                         goto success;
  423                 }
  424         }
  425         IFNET_RUNLOCK_NOSLEEP();
  426 
  427         /* last resort: get from random number source */
  428         if (get_rand_ifid(ifp, in6) == 0) {
  429                 nd6log((LOG_DEBUG,
  430                     "%s: interface identifier generated by random number\n",
  431                     if_name(ifp0)));
  432                 goto success;
  433         }
  434 
  435         printf("%s: failed to get interface identifier\n", if_name(ifp0));
  436         return -1;
  437 
  438 success:
  439         nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
  440             if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10],
  441             in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13],
  442             in6->s6_addr[14], in6->s6_addr[15]));
  443         return 0;
  444 }
  445 
  446 /*
  447  * altifp - secondary EUI64 source
  448  */
  449 static int
  450 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp)
  451 {
  452         struct in6_ifaddr *ia;
  453         struct in6_aliasreq ifra;
  454         struct nd_prefixctl pr0;
  455         int i, error;
  456 
  457         /*
  458          * configure link-local address.
  459          */
  460         bzero(&ifra, sizeof(ifra));
  461 
  462         /*
  463          * in6_update_ifa() does not use ifra_name, but we accurately set it
  464          * for safety.
  465          */
  466         strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
  467 
  468         ifra.ifra_addr.sin6_family = AF_INET6;
  469         ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
  470         ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000);
  471         ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
  472         if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
  473                 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
  474                 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
  475         } else {
  476                 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
  477                         nd6log((LOG_ERR,
  478                             "%s: no ifid available\n", if_name(ifp)));
  479                         return (-1);
  480                 }
  481         }
  482         if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL))
  483                 return (-1);
  484 
  485         ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
  486         ifra.ifra_prefixmask.sin6_family = AF_INET6;
  487         ifra.ifra_prefixmask.sin6_addr = in6mask64;
  488         /* link-local addresses should NEVER expire. */
  489         ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
  490         ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
  491 
  492         /*
  493          * Now call in6_update_ifa() to do a bunch of procedures to configure
  494          * a link-local address. We can set the 3rd argument to NULL, because
  495          * we know there's no other link-local address on the interface
  496          * and therefore we are adding one (instead of updating one).
  497          */
  498         if ((error = in6_update_ifa(ifp, &ifra, NULL,
  499                                     IN6_IFAUPDATE_DADDELAY)) != 0) {
  500                 /*
  501                  * XXX: When the interface does not support IPv6, this call
  502                  * would fail in the SIOCSIFADDR ioctl.  I believe the
  503                  * notification is rather confusing in this case, so just
  504                  * suppress it.  (jinmei@kame.net 20010130)
  505                  */
  506                 if (error != EAFNOSUPPORT)
  507                         nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to "
  508                             "configure a link-local address on %s "
  509                             "(errno=%d)\n",
  510                             if_name(ifp), error));
  511                 return (-1);
  512         }
  513 
  514         ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
  515         KASSERT(ia != NULL, ("%s: ia == NULL, ifp=%p", __func__, ifp));
  516 
  517         ifa_free(&ia->ia_ifa);
  518 
  519         /*
  520          * Make the link-local prefix (fe80::%link/64) as on-link.
  521          * Since we'd like to manage prefixes separately from addresses,
  522          * we make an ND6 prefix structure for the link-local prefix,
  523          * and add it to the prefix list as a never-expire prefix.
  524          * XXX: this change might affect some existing code base...
  525          */
  526         bzero(&pr0, sizeof(pr0));
  527         pr0.ndpr_ifp = ifp;
  528         /* this should be 64 at this moment. */
  529         pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
  530         pr0.ndpr_prefix = ifra.ifra_addr;
  531         /* apply the mask for safety. (nd6_prelist_add will apply it again) */
  532         for (i = 0; i < 4; i++) {
  533                 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
  534                     in6mask64.s6_addr32[i];
  535         }
  536         /*
  537          * Initialize parameters.  The link-local prefix must always be
  538          * on-link, and its lifetimes never expire.
  539          */
  540         pr0.ndpr_raf_onlink = 1;
  541         pr0.ndpr_raf_auto = 1;  /* probably meaningless */
  542         pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
  543         pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
  544         /*
  545          * Since there is no other link-local addresses, nd6_prefix_lookup()
  546          * probably returns NULL.  However, we cannot always expect the result.
  547          * For example, if we first remove the (only) existing link-local
  548          * address, and then reconfigure another one, the prefix is still
  549          * valid with referring to the old link-local address.
  550          */
  551         if (nd6_prefix_lookup(&pr0) == NULL) {
  552                 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
  553                         return (error);
  554         }
  555 
  556         return 0;
  557 }
  558 
  559 /*
  560  * ifp - must be IFT_LOOP
  561  */
  562 static int
  563 in6_ifattach_loopback(struct ifnet *ifp)
  564 {
  565         struct in6_aliasreq ifra;
  566         int error;
  567 
  568         bzero(&ifra, sizeof(ifra));
  569 
  570         /*
  571          * in6_update_ifa() does not use ifra_name, but we accurately set it
  572          * for safety.
  573          */
  574         strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
  575 
  576         ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
  577         ifra.ifra_prefixmask.sin6_family = AF_INET6;
  578         ifra.ifra_prefixmask.sin6_addr = in6mask128;
  579 
  580         /*
  581          * Always initialize ia_dstaddr (= broadcast address) to loopback
  582          * address.  Follows IPv4 practice - see in_ifinit().
  583          */
  584         ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
  585         ifra.ifra_dstaddr.sin6_family = AF_INET6;
  586         ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
  587 
  588         ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
  589         ifra.ifra_addr.sin6_family = AF_INET6;
  590         ifra.ifra_addr.sin6_addr = in6addr_loopback;
  591 
  592         /* the loopback  address should NEVER expire. */
  593         ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
  594         ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
  595 
  596         /* we don't need to perform DAD on loopback interfaces. */
  597         ifra.ifra_flags |= IN6_IFF_NODAD;
  598 
  599         /* skip registration to the prefix list. XXX should be temporary. */
  600         ifra.ifra_flags |= IN6_IFF_NOPFX;
  601 
  602         /*
  603          * We are sure that this is a newly assigned address, so we can set
  604          * NULL to the 3rd arg.
  605          */
  606         if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) {
  607                 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure "
  608                     "the loopback address on %s (errno=%d)\n",
  609                     if_name(ifp), error));
  610                 return (-1);
  611         }
  612 
  613         return 0;
  614 }
  615 
  616 /*
  617  * compute NI group address, based on the current hostname setting.
  618  * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later).
  619  *
  620  * when ifp == NULL, the caller is responsible for filling scopeid.
  621  */
  622 int
  623 in6_nigroup(struct ifnet *ifp, const char *name, int namelen,
  624     struct in6_addr *in6)
  625 {
  626         struct prison *pr;
  627         const char *p;
  628         u_char *q;
  629         MD5_CTX ctxt;
  630         u_int8_t digest[16];
  631         char l;
  632         char n[64];     /* a single label must not exceed 63 chars */
  633 
  634         /*
  635          * If no name is given and namelen is -1,
  636          * we try to do the hostname lookup ourselves.
  637          */
  638         if (!name && namelen == -1) {
  639                 pr = curthread->td_ucred->cr_prison;
  640                 mtx_lock(&pr->pr_mtx);
  641                 name = pr->pr_hostname;
  642                 namelen = strlen(name);
  643         } else
  644                 pr = NULL;
  645         if (!name || !namelen) {
  646                 if (pr != NULL)
  647                         mtx_unlock(&pr->pr_mtx);
  648                 return -1;
  649         }
  650 
  651         p = name;
  652         while (p && *p && *p != '.' && p - name < namelen)
  653                 p++;
  654         if (p == name || p - name > sizeof(n) - 1) {
  655                 if (pr != NULL)
  656                         mtx_unlock(&pr->pr_mtx);
  657                 return -1;      /* label too long */
  658         }
  659         l = p - name;
  660         strncpy(n, name, l);
  661         if (pr != NULL)
  662                 mtx_unlock(&pr->pr_mtx);
  663         n[(int)l] = '\0';
  664         for (q = n; *q; q++) {
  665                 if ('A' <= *q && *q <= 'Z')
  666                         *q = *q - 'A' + 'a';
  667         }
  668 
  669         /* generate 8 bytes of pseudo-random value. */
  670         bzero(&ctxt, sizeof(ctxt));
  671         MD5Init(&ctxt);
  672         MD5Update(&ctxt, &l, sizeof(l));
  673         MD5Update(&ctxt, n, l);
  674         MD5Final(digest, &ctxt);
  675 
  676         bzero(in6, sizeof(*in6));
  677         in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL;
  678         in6->s6_addr8[11] = 2;
  679         bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3]));
  680         if (in6_setscope(in6, ifp, NULL))
  681                 return (-1); /* XXX: should not fail */
  682 
  683         return 0;
  684 }
  685 
  686 /*
  687  * XXX multiple loopback interface needs more care.  for instance,
  688  * nodelocal address needs to be configured onto only one of them.
  689  * XXX multiple link-local address case
  690  *
  691  * altifp - secondary EUI64 source
  692  */
  693 void
  694 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp)
  695 {
  696         struct in6_ifaddr *ia;
  697         struct in6_addr in6;
  698 
  699         /* some of the interfaces are inherently not IPv6 capable */
  700         switch (ifp->if_type) {
  701         case IFT_PFLOG:
  702         case IFT_PFSYNC:
  703         case IFT_CARP:
  704                 return;
  705         }
  706 
  707         /*
  708          * quirks based on interface type
  709          */
  710         switch (ifp->if_type) {
  711 #ifdef IFT_STF
  712         case IFT_STF:
  713                 /*
  714                  * 6to4 interface is a very special kind of beast.
  715                  * no multicast, no linklocal.  RFC2529 specifies how to make
  716                  * linklocals for 6to4 interface, but there's no use and
  717                  * it is rather harmful to have one.
  718                  */
  719                 goto statinit;
  720 #endif
  721         default:
  722                 break;
  723         }
  724 
  725         /*
  726          * usually, we require multicast capability to the interface
  727          */
  728         if ((ifp->if_flags & IFF_MULTICAST) == 0) {
  729                 nd6log((LOG_INFO, "in6_ifattach: "
  730                     "%s is not multicast capable, IPv6 not enabled\n",
  731                     if_name(ifp)));
  732                 return;
  733         }
  734 
  735         /*
  736          * assign loopback address for loopback interface.
  737          * XXX multiple loopback interface case.
  738          */
  739         if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
  740                 struct ifaddr *ifa;
  741 
  742                 in6 = in6addr_loopback;
  743                 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6);
  744                 if (ifa == NULL) {
  745                         if (in6_ifattach_loopback(ifp) != 0)
  746                                 return;
  747                 } else
  748                         ifa_free(ifa);
  749         }
  750 
  751         /*
  752          * assign a link-local address, if there's none.
  753          */
  754         if (V_ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) {
  755                 ia = in6ifa_ifpforlinklocal(ifp, 0);
  756                 if (ia == NULL) {
  757                         if (in6_ifattach_linklocal(ifp, altifp) == 0) {
  758                                 /* linklocal address assigned */
  759                         } else {
  760                                 /* failed to assign linklocal address. bark? */
  761                         }
  762                 } else
  763                         ifa_free(&ia->ia_ifa);
  764         }
  765 
  766 #ifdef IFT_STF                  /* XXX */
  767 statinit:
  768 #endif
  769 
  770         /* update dynamically. */
  771         if (V_in6_maxmtu < ifp->if_mtu)
  772                 V_in6_maxmtu = ifp->if_mtu;
  773 }
  774 
  775 /*
  776  * NOTE: in6_ifdetach() does not support loopback if at this moment.
  777  * We don't need this function in bsdi, because interfaces are never removed
  778  * from the ifnet list in bsdi.
  779  */
  780 void
  781 in6_ifdetach(struct ifnet *ifp)
  782 {
  783         struct in6_ifaddr *ia;
  784         struct ifaddr *ifa, *next;
  785         struct radix_node_head *rnh;
  786         struct rtentry *rt;
  787         short rtflags;
  788         struct sockaddr_in6 sin6;
  789         struct in6_multi_mship *imm;
  790 
  791         /* remove neighbor management table */
  792         nd6_purge(ifp);
  793 
  794         /* nuke any of IPv6 addresses we have */
  795         TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
  796                 if (ifa->ifa_addr->sa_family != AF_INET6)
  797                         continue;
  798                 in6_purgeaddr(ifa);
  799         }
  800 
  801         /* undo everything done by in6_ifattach(), just in case */
  802         TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
  803                 if (ifa->ifa_addr->sa_family != AF_INET6
  804                  || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
  805                         continue;
  806                 }
  807 
  808                 ia = (struct in6_ifaddr *)ifa;
  809 
  810                 /*
  811                  * leave from multicast groups we have joined for the interface
  812                  */
  813                 while ((imm = ia->ia6_memberships.lh_first) != NULL) {
  814                         LIST_REMOVE(imm, i6mm_chain);
  815                         in6_leavegroup(imm);
  816                 }
  817 
  818                 /* remove from the routing table */
  819                 if ((ia->ia_flags & IFA_ROUTE) &&
  820                     (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) {
  821                         rtflags = rt->rt_flags;
  822                         RTFREE_LOCKED(rt);
  823                         rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr,
  824                             (struct sockaddr *)&ia->ia_addr,
  825                             (struct sockaddr *)&ia->ia_prefixmask,
  826                             rtflags, (struct rtentry **)0);
  827                 }
  828 
  829                 /* remove from the linked list */
  830                 IF_ADDR_LOCK(ifp);
  831                 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
  832                 IF_ADDR_UNLOCK(ifp);
  833                 ifa_free(ifa);                          /* if_addrhead */
  834 
  835                 IN6_IFADDR_WLOCK();
  836                 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
  837                 IN6_IFADDR_WUNLOCK();
  838                 ifa_free(ifa);
  839         }
  840 
  841         in6_pcbpurgeif0(&V_udbinfo, ifp);
  842         in6_pcbpurgeif0(&V_ripcbinfo, ifp);
  843         /* leave from all multicast groups joined */
  844         in6_purgemaddrs(ifp);
  845 
  846         /*
  847          * remove neighbor management table.  we call it twice just to make
  848          * sure we nuke everything.  maybe we need just one call.
  849          * XXX: since the first call did not release addresses, some prefixes
  850          * might remain.  We should call nd6_purge() again to release the
  851          * prefixes after removing all addresses above.
  852          * (Or can we just delay calling nd6_purge until at this point?)
  853          */
  854         nd6_purge(ifp);
  855 
  856         /* remove route to link-local allnodes multicast (ff02::1) */
  857         bzero(&sin6, sizeof(sin6));
  858         sin6.sin6_len = sizeof(struct sockaddr_in6);
  859         sin6.sin6_family = AF_INET6;
  860         sin6.sin6_addr = in6addr_linklocal_allnodes;
  861         if (in6_setscope(&sin6.sin6_addr, ifp, NULL))
  862                 /* XXX: should not fail */
  863                 return;
  864         /* XXX grab lock first to avoid LOR */
  865         rnh = rt_tables_get_rnh(0, AF_INET6);
  866         if (rnh != NULL) {
  867                 RADIX_NODE_HEAD_LOCK(rnh);
  868                 rt = rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED);
  869                 if (rt) {
  870                         if (rt->rt_ifp == ifp)
  871                                 rtexpunge(rt);
  872                         RTFREE_LOCKED(rt);
  873                 }
  874                 RADIX_NODE_HEAD_UNLOCK(rnh);
  875         }
  876 }
  877 
  878 int
  879 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf,
  880     const u_int8_t *baseid, int generate)
  881 {
  882         u_int8_t nullbuf[8];
  883         struct nd_ifinfo *ndi = ND_IFINFO(ifp);
  884 
  885         bzero(nullbuf, sizeof(nullbuf));
  886         if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
  887                 /* we've never created a random ID.  Create a new one. */
  888                 generate = 1;
  889         }
  890 
  891         if (generate) {
  892                 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
  893 
  894                 /* generate_tmp_ifid will update seedn and buf */
  895                 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
  896                     ndi->randomid);
  897         }
  898         bcopy(ndi->randomid, retbuf, 8);
  899 
  900         return (0);
  901 }
  902 
  903 void
  904 in6_tmpaddrtimer(void *arg)
  905 {
  906         CURVNET_SET((struct vnet *) arg);
  907         struct nd_ifinfo *ndi;
  908         u_int8_t nullbuf[8];
  909         struct ifnet *ifp;
  910 
  911         callout_reset(&V_in6_tmpaddrtimer_ch,
  912             (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor -
  913             V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet);
  914 
  915         bzero(nullbuf, sizeof(nullbuf));
  916         for (ifp = TAILQ_FIRST(&V_ifnet); ifp;
  917             ifp = TAILQ_NEXT(ifp, if_list)) {
  918                 ndi = ND_IFINFO(ifp);
  919                 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
  920                         /*
  921                          * We've been generating a random ID on this interface.
  922                          * Create a new one.
  923                          */
  924                         (void)generate_tmp_ifid(ndi->randomseed0,
  925                             ndi->randomseed1, ndi->randomid);
  926                 }
  927         }
  928 
  929         CURVNET_RESTORE();
  930 }
  931 
  932 static void
  933 in6_purgemaddrs(struct ifnet *ifp)
  934 {
  935         LIST_HEAD(,in6_multi)    purgeinms;
  936         struct in6_multi        *inm, *tinm;
  937         struct ifmultiaddr      *ifma;
  938 
  939         LIST_INIT(&purgeinms);
  940         IN6_MULTI_LOCK();
  941 
  942         /*
  943          * Extract list of in6_multi associated with the detaching ifp
  944          * which the PF_INET6 layer is about to release.
  945          * We need to do this as IF_ADDR_LOCK() may be re-acquired
  946          * by code further down.
  947          */
  948         IF_ADDR_LOCK(ifp);
  949         TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
  950                 if (ifma->ifma_addr->sa_family != AF_INET6 ||
  951                     ifma->ifma_protospec == NULL)
  952                         continue;
  953                 inm = (struct in6_multi *)ifma->ifma_protospec;
  954                 LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry);
  955         }
  956         IF_ADDR_UNLOCK(ifp);
  957 
  958         LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) {
  959                 LIST_REMOVE(inm, in6m_entry);
  960                 in6m_release_locked(inm);
  961         }
  962         mld_ifdetach(ifp);
  963 
  964         IN6_MULTI_UNLOCK();
  965 }

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