sys/net/if_fddisubr.c

   1 /*
   2  * Copyright (c) 1995, 1996
   3  *      Matt Thomas <matt@3am-software.com>.  All rights reserved.
   4  * Copyright (c) 1982, 1989, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  *      from: if_ethersubr.c,v 1.5 1994/12/13 22:31:45 wollman Exp
  36  * $FreeBSD: src/sys/net/if_fddisubr.c,v 1.41.2.8 2002/02/20 23:34:09 fjoe Exp $
  37  * $DragonFly: src/sys/net/Attic/if_fddisubr.c,v 1.22 2006/12/22 23:44:54 swildner Exp $
  38  */
  39
  40 #include "opt_atalk.h"
  41 #include "opt_inet.h"
  42 #include "opt_inet6.h"
  43 #include "opt_ipx.h"
  44
  45 #include <sys/param.h>
  46 #include <sys/systm.h>
  47 #include <sys/mbuf.h>
  48 #include <sys/socket.h>
  49 #include <sys/malloc.h>
  50 #include <sys/serialize.h>
  51
  52 #include <net/if.h>
  53 #include <net/bpf.h>
  54 #include <net/netisr.h>
  55 #include <net/route.h>
  56 #include <net/if_llc.h>
  57 #include <net/if_dl.h>
  58 #include <net/if_types.h>
  59 #include <net/ifq_var.h>
  60
  61 #if defined(INET) || defined(INET6)
  62 #include <netinet/in.h>
  63 #include <netinet/in_var.h>
  64 #include <netinet/if_ether.h>
  65 #include <net/ethernet.h>
  66 #endif
  67 #ifdef INET6
  68 #include <netinet6/nd6.h>
  69 #endif
  70 #if defined(__DragonFly__) || defined(__FreeBSD__)
  71 #include <netinet/if_fddi.h>
  72 #else
  73 #include <net/if_fddi.h>
  74 #endif
  75
  76 #ifdef IPX
  77 #include <netproto/ipx/ipx.h>
  78 #include <netproto/ipx/ipx_if.h>
  79 #endif
  80
  81 #ifdef NS
  82 #include <netns/ns.h>
  83 #include <netns/ns_if.h>
  84 #endif
  85
  86 #ifdef DECNET
  87 #include <netdnet/dn.h>
  88 #endif
  89
  90 #ifdef NETATALK
  91 #include <netproto/atalk/at.h>
  92 #include <netproto/atalk/at_var.h>
  93 #include <netproto/atalk/at_extern.h>
  94
  95 #define llc_snap_org_code llc_un.type_snap.org_code
  96 #define llc_snap_ether_type llc_un.type_snap.ether_type
  97
  98 extern u_char   at_org_code[ 3 ];
  99 extern u_char   aarp_org_code[ 3 ];
 100 #endif /* NETATALK */
 101
 102 static  int fddi_resolvemulti (struct ifnet *, struct sockaddr **,
 103                                    struct sockaddr *);
 104 static void     fddi_input(struct ifnet *, struct mbuf *);
 105 static int      fddi_output(struct ifnet *, struct mbuf *, struct sockaddr *,
 106                             struct rtentry *);
 107
 108 #define senderr(e) { error = (e); goto bad;}
 109
 110 /*
 111  * This really should be defined in if_llc.h but in case it isn't.
 112  */
 113 #ifndef llc_snap
 114 #define llc_snap        llc_un.type_snap
 115 #endif
 116
 117 #if defined(__DragonFly__)
 118 #define RTALLOC1(a, b)          _rtlookup(a, b, b ? RTL_DOCLONE : RTL_DONTCLONE)
 119 #define ARPRESOLVE(a, b, c, d, e, f)    arpresolve(a, b, c, d, e)
 120 #elif defined(__FreeBSD__)
 121 #define RTALLOC1(a, b)                  rtalloc1(a, b, 0UL)
 122 #define ARPRESOLVE(a, b, c, d, e, f)    arpresolve(a, b, c, d, e, f)
 123 #endif
 124 /*
 125  * FDDI output routine.
 126  * Encapsulate a packet of type family for the local net.
 127  * Use trailer local net encapsulation if enough data in first
 128  * packet leaves a multiple of 512 bytes of data in remainder.
 129  * Assumes that ifp is actually pointer to arpcom structure.
 130  */
 131 static int
 132 fddi_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
 133             struct rtentry *rt)
 134 {
 135         struct arpcom *ac = (struct arpcom *)ifp;
 136         u_int16_t type;
 137         u_char esrc[6], edst[6];
 138         struct fddi_header *fh;
 139         boolean_t hdrcmplt = FALSE;
 140         int loop_copy = 0, error;
 141         struct altq_pktattr pktattr;
 142
 143         if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
 144                 senderr(ENETDOWN);
 145
 146         /*
 147          * If the queueing discipline needs packet classification,
 148          * do it before prepending link headers.
 149          */
 150         ifq_classify(&ifp->if_snd, m, dst->sa_family, &pktattr);
 151
 152         switch (dst->sa_family) {
 153 #ifdef INET
 154         case AF_INET: {
 155                 if (!arpresolve(ifp, rt, m, dst, edst))
 156                         return (0);     /* if not yet resolved */
 157                 type = htons(ETHERTYPE_IP);
 158                 break;
 159         }
 160 #endif
 161 #ifdef INET6
 162         case AF_INET6:
 163                 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, (u_char *)edst)) {
 164                         /* Something bad happened */
 165                         return (0);
 166                 }
 167                 type = htons(ETHERTYPE_IPV6);
 168                 break;
 169 #endif
 170 #ifdef IPX
 171         case AF_IPX:
 172                 type = htons(ETHERTYPE_IPX);
 173                 bcopy(&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), edst,
 174                       sizeof edst);
 175                 break;
 176 #endif
 177 #ifdef NETATALK
 178         case AF_APPLETALK: {
 179                 struct at_ifaddr *aa;
 180
 181                 if (!aarpresolve((struct arpcom *) ifp, m,
 182                                  (struct sockaddr_at *)dst, edst))
 183                         return (0);
 184
 185                 /*
 186                  * ifaddr is the first thing in at_ifaddr
 187                  */
 188                 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) {
 189                         error = 0;      /* XXX */
 190                         goto bad;
 191                 }
 192
 193                 /*
 194                  * In the phase 2 case, we need to prepend an mbuf
 195                  * for the llc header.  Since we must preserve the
 196                  * value of m, which is passed to us by value, we
 197                  * m_copy() the first mbuf, and use it for our llc
 198                  * header.
 199                  */
 200                 if (aa->aa_flags & AFA_PHASE2) {
 201                         struct llc llc;
 202
 203                         M_PREPEND(m, sizeof(struct llc), MB_WAIT);
 204                         if (m == NULL)
 205                                 senderr(ENOBUFS);
 206                         llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
 207                         llc.llc_control = LLC_UI;
 208                         bcopy(at_org_code, llc.llc_snap_org_code,
 209                               sizeof at_org_code);
 210                         llc.llc_snap_ether_type = htons(ETHERTYPE_AT);
 211                         bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc));
 212                         type = 0;
 213                 } else {
 214                         type = htons(ETHERTYPE_AT);
 215                 }
 216                 break;
 217         }
 218 #endif /* NETATALK */
 219 #ifdef NS
 220         case AF_NS:
 221                 type = htons(ETHERTYPE_NS);
 222                 bcopy(&(((struct sockaddr_ns *)dst)->sns_addr.x_host), edst,
 223                       sizeof edst);
 224                 break;
 225 #endif
 226
 227         case pseudo_AF_HDRCMPLT:
 228         {
 229                 struct ether_header *eh;
 230
 231                 hdrcmplt = TRUE;
 232                 eh = (struct ether_header *)dst->sa_data;
 233                 memcpy(esrc, eh->ether_shost, sizeof esrc);
 234                 /* FALLTHROUGH */
 235         }
 236
 237         case AF_UNSPEC:
 238         {
 239                 struct ether_header *eh;
 240
 241                 loop_copy = -1;
 242                 eh = (struct ether_header *)dst->sa_data;
 243                 memcpy(edst, eh->ether_dhost, sizeof edst);
 244                 if (*edst & 1)
 245                         m->m_flags |= (M_BCAST|M_MCAST);
 246                 type = eh->ether_type;
 247                 break;
 248         }
 249
 250         case AF_IMPLINK:
 251         {
 252                 fh = mtod(m, struct fddi_header *);
 253                 error = EPROTONOSUPPORT;
 254                 switch (fh->fddi_fc & (FDDIFC_C|FDDIFC_L|FDDIFC_F)) {
 255                         case FDDIFC_LLC_ASYNC: {
 256                                 /* legal priorities are 0 through 7 */
 257                                 if ((fh->fddi_fc & FDDIFC_Z) > 7)
 258                                         goto bad;
 259                                 break;
 260                         }
 261                         case FDDIFC_LLC_SYNC: {
 262                                 /* FDDIFC_Z bits reserved, must be zero */
 263                                 if (fh->fddi_fc & FDDIFC_Z)
 264                                         goto bad;
 265                                 break;
 266                         }
 267                         case FDDIFC_SMT: {
 268                                 /* FDDIFC_Z bits must be non zero */
 269                                 if ((fh->fddi_fc & FDDIFC_Z) == 0)
 270                                         goto bad;
 271                                 break;
 272                         }
 273                         default: {
 274                                 /* anything else is too dangerous */
 275                                 goto bad;
 276                         }
 277                 }
 278                 error = 0;
 279                 if (fh->fddi_dhost[0] & 1)
 280                         m->m_flags |= (M_BCAST | M_MCAST);
 281                 goto queue_it;
 282         }
 283         default:
 284                 kprintf("%s: can't handle af%d\n", ifp->if_xname,
 285                         dst->sa_family);
 286                 senderr(EAFNOSUPPORT);
 287         }
 288
 289         if (type != 0) {
 290                 struct llc *l;
 291
 292                 M_PREPEND(m, sizeof(struct llc), MB_DONTWAIT);
 293                 if (m == NULL)
 294                         return (ENOBUFS);
 295                 l = mtod(m, struct llc *);
 296                 l->llc_control = LLC_UI;
 297                 l->llc_dsap = l->llc_ssap = LLC_SNAP_LSAP;
 298                 l->llc_snap.org_code[0] = l->llc_snap.org_code[1] =
 299                     l->llc_snap.org_code[2] = 0;
 300                 memcpy(&l->llc_snap.ether_type, &type, sizeof(u_int16_t));
 301         }
 302
 303         /*
 304          * Add local net header.  If no space in first mbuf,
 305          * allocate another.
 306          */
 307         M_PREPEND(m, sizeof(struct fddi_header), MB_DONTWAIT);
 308         if (m == NULL)
 309                 return (ENOBUFS);
 310         fh = mtod(m, struct fddi_header *);
 311         fh->fddi_fc = FDDIFC_LLC_ASYNC|FDDIFC_LLC_PRIO4;
 312         memcpy(fh->fddi_dhost, edst, sizeof edst);
 313
 314 queue_it:
 315         if (hdrcmplt)
 316                 memcpy(fh->fddi_shost, esrc, sizeof fh->fddi_shost);
 317         else
 318                 memcpy(fh->fddi_shost, ac->ac_enaddr, sizeof fh->fddi_shost);
 319         /*
 320                 memcpy(fh->fddi_shost, ac->ac_enaddr, sizeof fh->fddi_shost);
 321          * Ethernet address or a broadcast address, loopback a copy.
 322          * XXX To make a simplex device behave exactly like a duplex
 323          * device, we should copy in the case of sending to our own
 324          * ethernet address (thus letting the original actually appear
 325          * on the wire). However, we don't do that here for security
 326          * reasons and compatibility with the original behavior.
 327          */
 328         if ((ifp->if_flags & IFF_SIMPLEX) &&
 329            (loop_copy != -1)) {
 330                 if ((m->m_flags & M_BCAST) || loop_copy) {
 331                         struct mbuf *n = m_copypacket(m, MB_DONTWAIT);
 332
 333                         if_simloop(ifp, n, dst->sa_family,
 334                                    sizeof(struct fddi_header));
 335                 } else if (bcmp(fh->fddi_dhost, fh->fddi_shost,
 336                                 sizeof(fh->fddi_shost)) == 0) {
 337                         if_simloop(ifp, m, dst->sa_family,
 338                                    sizeof(struct fddi_header));
 339                         senderr(0);     /* XXX */
 340                 }
 341         }
 342
 343         /*
 344          * Dispatch the message to the interface.
 345          */
 346         return (ifq_handoff(ifp, m, &pktattr));
 347
 348 bad:
 349         m_freem(m);
 350         return (error);
 351 }
 352
 353 /*
 354  * Process a received FDDI packet;
 355  * the packet is in the mbuf chain m without
 356  * the fddi header, which is provided separately.
 357  */
 358 static void
 359 fddi_input(struct ifnet *ifp, struct mbuf *m)
 360 {
 361         int isr;
 362         struct llc *l;
 363         struct fddi_header *fh = mtod(m, struct fddi_header *);
 364
 365         ASSERT_SERIALIZED(ifp->if_serializer);
 366
 367         if (m->m_len < sizeof(struct fddi_header)) {
 368                 /* XXX error in the caller. */
 369                 m_freem(m);
 370                 return;
 371         }
 372         m_adj(m, sizeof(struct fddi_header));
 373         m->m_pkthdr.rcvif = ifp;
 374
 375         if (!(ifp->if_flags & IFF_UP)) {
 376                 m_freem(m);
 377                 return;
 378         }
 379         getmicrotime(&ifp->if_lastchange);
 380         ifp->if_ibytes += m->m_pkthdr.len + sizeof *fh;
 381         if (fh->fddi_dhost[0] & 1) {
 382                 if (bcmp(ifp->if_broadcastaddr, fh->fddi_dhost,
 383                          ifp->if_addrlen) == 0)
 384                         m->m_flags |= M_BCAST;
 385                 else
 386                         m->m_flags |= M_MCAST;
 387                 ifp->if_imcasts++;
 388         } else if ((ifp->if_flags & IFF_PROMISC) &&
 389             bcmp(((struct arpcom *)ifp)->ac_enaddr, fh->fddi_dhost,
 390                  sizeof fh->fddi_dhost) != 0) {
 391                 m_freem(m);
 392                 return;
 393         }
 394
 395 #ifdef M_LINK0
 396         /*
 397          * If this has a LLC priority of 0, then mark it so upper
 398          * layers have a hint that it really came via a FDDI/Ethernet
 399          * bridge.
 400          */
 401         if ((fh->fddi_fc & FDDIFC_LLC_PRIO7) == FDDIFC_LLC_PRIO0)
 402                 m->m_flags |= M_LINK0;
 403 #endif
 404
 405         l = mtod(m, struct llc *);
 406         switch (l->llc_dsap) {
 407 #if defined(INET) || defined(INET6) || defined(NS) || defined(DECNET) || defined(IPX) || defined(NETATALK)
 408         case LLC_SNAP_LSAP:
 409         {
 410                 u_int16_t type;
 411                 if (l->llc_control != LLC_UI || l->llc_ssap != LLC_SNAP_LSAP)
 412                         goto dropanyway;
 413 #ifdef NETATALK
 414                 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code,
 415                          sizeof(at_org_code)) == 0 &&
 416                     sizeof(at_org_code) == 0 &&
 417                     ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) {
 418                         m_adj(m, sizeof(struct llc));
 419                         isr = NETISR_ATALK2;
 420                         break;
 421                 }
 422
 423                 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code,
 424                          sizeof(aarp_org_code)) == 0 &&
 425                         ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) {
 426                     m_adj(m, sizeof(struct llc));
 427                     isr = NETISR_AARP;
 428                     break;
 429                 }
 430 #endif
 431                 if (l->llc_snap.org_code[0] != 0 ||
 432                     l->llc_snap.org_code[1] != 0 ||
 433                     l->llc_snap.org_code[2] != 0)
 434                         goto dropanyway;
 435                 type = ntohs(l->llc_snap.ether_type);
 436                 m_adj(m, 8);
 437                 switch (type) {
 438 #ifdef INET
 439                 case ETHERTYPE_IP:
 440                         if (ipflow_fastforward(m, ifp->if_serializer))
 441                                 return;
 442                         isr = NETISR_IP;
 443                         break;
 444
 445                 case ETHERTYPE_ARP:
 446                         if (ifp->if_flags & IFF_NOARP)
 447                                 goto dropanyway;
 448                         isr = NETISR_ARP;
 449                         break;
 450 #endif
 451 #ifdef INET6
 452                 case ETHERTYPE_IPV6:
 453                         isr = NETISR_IPV6;
 454                         break;
 455 #endif
 456 #ifdef IPX
 457                 case ETHERTYPE_IPX:
 458                         isr = NETISR_IPX;
 459                         break;
 460 #endif
 461 #ifdef NS
 462                 case ETHERTYPE_NS:
 463                         isr = NETISR_NS;
 464                         break;
 465 #endif
 466 #ifdef DECNET
 467                 case ETHERTYPE_DECNET:
 468                         isr = NETISR_DECNET;
 469                         break;
 470 #endif
 471 #ifdef NETATALK
 472                 case ETHERTYPE_AT:
 473                         isr = NETISR_ATALK1;
 474                         break;
 475                 case ETHERTYPE_AARP:
 476                         isr = NETISR_AARP;
 477                         break;
 478 #endif /* NETATALK */
 479                 default:
 480                         /* kprintf("fddi_input: unknown protocol 0x%x\n", type); */
 481                         ifp->if_noproto++;
 482                         goto dropanyway;
 483                 }
 484                 break;
 485         }
 486 #endif /* INET || NS */
 487
 488         default:
 489                 /* kprintf("fddi_input: unknown dsap 0x%x\n", l->llc_dsap); */
 490                 ifp->if_noproto++;
 491         dropanyway:
 492                 m_freem(m);
 493                 return;
 494         }
 495
 496         netisr_dispatch(isr, m);
 497 }
 498
 499 /*
 500  * Perform common duties while attaching to interface list
 501  */
 502 #ifdef __NetBSD__
 503 #define ifa_next        ifa_list.tqe_next
 504 #endif
 505
 506 void
 507 fddi_ifattach(struct ifnet *ifp, lwkt_serialize_t serializer)
 508 {
 509         struct sockaddr_dl *sdl;
 510
 511         ifp->if_input = fddi_input;
 512         ifp->if_output = fddi_output;
 513         ifp->if_type = IFT_FDDI;
 514         ifp->if_addrlen = 6;
 515         ifp->if_broadcastaddr = fddibroadcastaddr;
 516         ifp->if_hdrlen = 21;
 517         ifp->if_mtu = FDDIMTU;
 518         ifp->if_resolvemulti = fddi_resolvemulti;
 519         ifp->if_baudrate = 100000000;
 520 #ifdef IFF_NOTRAILERS
 521         ifp->if_flags |= IFF_NOTRAILERS;
 522 #endif
 523         if_attach(ifp, serializer);
 524 #if defined(__DragonFly__) || defined(__FreeBSD__)
 525         sdl = IF_LLSOCKADDR(ifp);
 526         sdl->sdl_type = IFT_FDDI;
 527         sdl->sdl_alen = ifp->if_addrlen;
 528         bcopy(((struct arpcom *)ifp)->ac_enaddr, LLADDR(sdl), ifp->if_addrlen);
 529 #elif defined(__NetBSD__)
 530         LIST_INIT(&((struct arpcom *)ifp)->ac_multiaddrs);
 531         for (ifa = ifp->if_addrlist.tqh_first; ifa != NULL; ifa = ifa->ifa_list.tqe_next)
 532 #else
 533         for (ifa = ifp->if_addrlist; ifa != NULL; ifa = ifa->ifa_next)
 534 #endif
 535 #if !defined(__DragonFly__) && !defined(__FreeBSD__)
 536                 if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&
 537                     sdl->sdl_family == AF_LINK) {
 538                         sdl->sdl_type = IFT_FDDI;
 539                         sdl->sdl_alen = ifp->if_addrlen;
 540                         bcopy(((struct arpcom *)ifp)->ac_enaddr, LLADDR(sdl),
 541                               ifp->if_addrlen);
 542                         break;
 543                 }
 544 #endif
 545         bpfattach(ifp, DLT_FDDI, sizeof(struct fddi_header));
 546 }
 547
 548 static int
 549 fddi_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa, struct sockaddr *sa)
 550 {
 551         struct sockaddr_dl *sdl;
 552         struct sockaddr_in *sin;
 553 #ifdef INET6
 554         struct sockaddr_in6 *sin6;
 555 #endif
 556         u_char *e_addr;
 557
 558         switch(sa->sa_family) {
 559         case AF_LINK:
 560                 /*
 561                  * No mapping needed. Just check that it's a valid MC address.
 562                  */
 563                 sdl = (struct sockaddr_dl *)sa;
 564                 e_addr = LLADDR(sdl);
 565                 if ((e_addr[0] & 1) != 1)
 566                         return EADDRNOTAVAIL;
 567                 *llsa = 0;
 568                 return 0;
 569
 570 #ifdef INET
 571         case AF_INET:
 572                 sin = (struct sockaddr_in *)sa;
 573                 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
 574                         return EADDRNOTAVAIL;
 575                 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
 576                        M_WAITOK);
 577                 sdl->sdl_len = sizeof *sdl;
 578                 sdl->sdl_family = AF_LINK;
 579                 sdl->sdl_index = ifp->if_index;
 580                 sdl->sdl_type = IFT_FDDI;
 581                 sdl->sdl_nlen = 0;
 582                 sdl->sdl_alen = ETHER_ADDR_LEN; /* XXX */
 583                 sdl->sdl_slen = 0;
 584                 e_addr = LLADDR(sdl);
 585                 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
 586                 *llsa = (struct sockaddr *)sdl;
 587                 return 0;
 588 #endif
 589 #ifdef INET6
 590         case AF_INET6:
 591                 sin6 = (struct sockaddr_in6 *)sa;
 592                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 593                         /*
 594                          * An IP6 address of 0 means listen to all
 595                          * of the Ethernet multicast address used for IP6.
 596                          * (This is used for multicast routers.)
 597                          */
 598                         ifp->if_flags |= IFF_ALLMULTI;
 599                         *llsa = 0;
 600                         return 0;
 601                 }
 602                 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
 603                         return EADDRNOTAVAIL;
 604                 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
 605                        M_WAITOK);
 606                 sdl->sdl_len = sizeof *sdl;
 607                 sdl->sdl_family = AF_LINK;
 608                 sdl->sdl_index = ifp->if_index;
 609                 sdl->sdl_type = IFT_FDDI;
 610                 sdl->sdl_nlen = 0;
 611                 sdl->sdl_alen = ETHER_ADDR_LEN; /* XXX */
 612                 sdl->sdl_slen = 0;
 613                 e_addr = LLADDR(sdl);
 614                 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
 615                 *llsa = (struct sockaddr *)sdl;
 616                 return 0;
 617 #endif
 618
 619         default:
 620                 /*
 621                  * Well, the text isn't quite right, but it's the name
 622                  * that counts...
 623                  */
 624                 return EAFNOSUPPORT;
 625         }
 626 }