common/bpf.c

   1 /* bpf.c
   2
   3    BPF socket interface code, originally contributed by Archie Cobbs. */
   4
   5 /*
   6  * Copyright (c) 2009,2012-2014,2016 by Internet Systems Consortium, Inc. ("ISC")
   7  * Copyright (c) 2004,2007 by Internet Systems Consortium, Inc. ("ISC")
   8  * Copyright (c) 1996-2003 by Internet Software Consortium
   9  *
  10  * Permission to use, copy, modify, and distribute this software for any
  11  * purpose with or without fee is hereby granted, provided that the above
  12  * copyright notice and this permission notice appear in all copies.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  15  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  16  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  17  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  18  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  19  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  20  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  21  *
  22  *   Internet Systems Consortium, Inc.
  23  *   950 Charter Street
  24  *   Redwood City, CA 94063
  25  *   <info@isc.org>
  26  *   https://www.isc.org/
  27  *
  28  * This software was contributed to Internet Systems Consortium
  29  * by Archie Cobbs.
  30  *
  31  * Patches for FDDI support on Digital Unix were written by Bill
  32  * Stapleton, and maintained for a while by Mike Meredith before he
  33  * managed to get me to integrate them.
  34  */
  35
  36 #include "dhcpd.h"
  37 #if defined (USE_BPF_SEND) || defined (USE_BPF_RECEIVE) \
  38                                 || defined (USE_LPF_RECEIVE)
  39 # if defined (USE_LPF_RECEIVE)
  40 #  include <asm/types.h>
  41 #  include <linux/filter.h>
  42 #  define bpf_insn sock_filter /* Linux: dare to be gratuitously different. */
  43 # else
  44 #  include <sys/ioctl.h>
  45 #  include <sys/uio.h>
  46 #  include <net/bpf.h>
  47 #  if defined (NEED_OSF_PFILT_HACKS)
  48 #   include <net/pfilt.h>
  49 #  endif
  50 # endif
  51
  52 #include <netinet/in_systm.h>
  53 #include "includes/netinet/ip.h"
  54 #include "includes/netinet/udp.h"
  55 #include "includes/netinet/if_ether.h"
  56 #endif
  57
  58 #if defined(USE_BPF_SEND) || defined(USE_BPF_RECEIVE) || defined(USE_BPF_HWADDR)
  59 #include <net/if_types.h>
  60 #include <ifaddrs.h>
  61 #endif
  62
  63 #include <errno.h>
  64
  65 /* Reinitializes the specified interface after an address change.   This
  66    is not required for packet-filter APIs. */
  67
  68 #ifdef USE_BPF_SEND
  69 void if_reinitialize_send (info)
  70         struct interface_info *info;
  71 {
  72 }
  73 #endif
  74
  75 #ifdef USE_BPF_RECEIVE
  76 void if_reinitialize_receive (info)
  77         struct interface_info *info;
  78 {
  79 }
  80 #endif
  81
  82 /* Called by get_interface_list for each interface that's discovered.
  83    Opens a packet filter for each interface and adds it to the select
  84    mask. */
  85
  86 #if defined (USE_BPF_SEND) || defined (USE_BPF_RECEIVE)
  87 int if_register_bpf (info)
  88         struct interface_info *info;
  89 {
  90         int sock;
  91         char filename[50];
  92         int b;
  93
  94         /* Open a BPF device */
  95         for (b = 0; 1; b++) {
  96                 /* %Audit% 31 bytes max. %2004.06.17,Safe% */
  97                 sprintf(filename, BPF_FORMAT, b);
  98                 sock = open (filename, O_RDWR, 0);
  99                 if (sock < 0) {
 100                         if (errno == EBUSY) {
 101                                 continue;
 102                         } else {
 103                                 if (!b)
 104                                         log_fatal ("No bpf devices.%s%s%s",
 105                                                "   Please read the README",
 106                                                " section for your operating",
 107                                                " system.");
 108                                 log_fatal ("Can't find free bpf: %m");
 109                         }
 110                 } else {
 111                         break;
 112                 }
 113         }
 114
 115         /* Set the BPF device to point at this interface. */
 116         if (ioctl (sock, BIOCSETIF, info -> ifp) < 0)
 117                 log_fatal ("Can't attach interface %s to bpf device %s: %m",
 118                        info -> name, filename);
 119
 120         get_hw_addr(info->name, &info->hw_address);
 121
 122         return sock;
 123 }
 124 #endif /* USE_BPF_SEND || USE_BPF_RECEIVE */
 125
 126 #ifdef USE_BPF_SEND
 127 void if_register_send (info)
 128         struct interface_info *info;
 129 {
 130         /* If we're using the bpf API for sending and receiving,
 131            we don't need to register this interface twice. */
 132 #ifndef USE_BPF_RECEIVE
 133         info -> wfdesc = if_register_bpf (info, interface);
 134 #else
 135         info -> wfdesc = info -> rfdesc;
 136 #endif
 137         if (!quiet_interface_discovery)
 138                 log_info ("Sending on   BPF/%s/%s%s%s",
 139                       info -> name,
 140                       print_hw_addr (info -> hw_address.hbuf [0],
 141                                      info -> hw_address.hlen - 1,
 142                                      &info -> hw_address.hbuf [1]),
 143                       (info -> shared_network ? "/" : ""),
 144                       (info -> shared_network ?
 145                        info -> shared_network -> name : ""));
 146 }
 147
 148 void if_deregister_send (info)
 149         struct interface_info *info;
 150 {
 151         /* If we're using the bpf API for sending and receiving,
 152            we don't need to register this interface twice. */
 153 #ifndef USE_BPF_RECEIVE
 154         close (info -> wfdesc);
 155 #endif
 156         info -> wfdesc = -1;
 157
 158         if (!quiet_interface_discovery)
 159                 log_info ("Disabling output on BPF/%s/%s%s%s",
 160                       info -> name,
 161                       print_hw_addr (info -> hw_address.hbuf [0],
 162                                      info -> hw_address.hlen - 1,
 163                                      &info -> hw_address.hbuf [1]),
 164                       (info -> shared_network ? "/" : ""),
 165                       (info -> shared_network ?
 166                        info -> shared_network -> name : ""));
 167 }
 168 #endif /* USE_BPF_SEND */
 169
 170 #if defined (USE_BPF_RECEIVE) || defined (USE_LPF_RECEIVE)
 171 /* Packet filter program...
 172    XXX Changes to the filter program may require changes to the constant
 173    offsets used in if_register_send to patch the BPF program! XXX */
 174
 175 struct bpf_insn dhcp_bpf_filter [] = {
 176         /* Make sure this is an IP packet... */
 177         BPF_STMT (BPF_LD + BPF_H + BPF_ABS, 12),
 178         BPF_JUMP (BPF_JMP + BPF_JEQ + BPF_K, ETHERTYPE_IP, 0, 8),
 179
 180         /* Make sure it's a UDP packet... */
 181         BPF_STMT (BPF_LD + BPF_B + BPF_ABS, 23),
 182         BPF_JUMP (BPF_JMP + BPF_JEQ + BPF_K, IPPROTO_UDP, 0, 6),
 183
 184         /* Make sure this isn't a fragment... */
 185         BPF_STMT(BPF_LD + BPF_H + BPF_ABS, 20),
 186         BPF_JUMP(BPF_JMP + BPF_JSET + BPF_K, 0x1fff, 4, 0),
 187
 188         /* Get the IP header length... */
 189         BPF_STMT (BPF_LDX + BPF_B + BPF_MSH, 14),
 190
 191         /* Make sure it's to the right port... */
 192         BPF_STMT (BPF_LD + BPF_H + BPF_IND, 16),
 193         BPF_JUMP (BPF_JMP + BPF_JEQ + BPF_K, 67, 0, 1),             /* patch */
 194
 195         /* If we passed all the tests, ask for the whole packet. */
 196         BPF_STMT(BPF_RET+BPF_K, (u_int)-1),
 197
 198         /* Otherwise, drop it. */
 199         BPF_STMT(BPF_RET+BPF_K, 0),
 200 };
 201
 202 #if defined (DEC_FDDI)
 203 struct bpf_insn *bpf_fddi_filter = NULL;
 204 #endif
 205
 206 int dhcp_bpf_filter_len = sizeof dhcp_bpf_filter / sizeof (struct bpf_insn);
 207 #if defined (HAVE_TR_SUPPORT)
 208 struct bpf_insn dhcp_bpf_tr_filter [] = {
 209         /* accept all token ring packets due to variable length header */
 210         /* if we want to get clever, insert the program here */
 211
 212         /* If we passed all the tests, ask for the whole packet. */
 213         BPF_STMT(BPF_RET+BPF_K, (u_int)-1),
 214
 215         /* Otherwise, drop it. */
 216         BPF_STMT(BPF_RET+BPF_K, 0),
 217 };
 218
 219 int dhcp_bpf_tr_filter_len = (sizeof dhcp_bpf_tr_filter /
 220                               sizeof (struct bpf_insn));
 221 #endif /* HAVE_TR_SUPPORT */
 222 #endif /* USE_LPF_RECEIVE || USE_BPF_RECEIVE */
 223
 224 #if defined (USE_BPF_RECEIVE)
 225 void if_register_receive (info)
 226         struct interface_info *info;
 227 {
 228         int flag = 1;
 229         struct bpf_version v;
 230         struct bpf_program p;
 231 #ifdef NEED_OSF_PFILT_HACKS
 232         u_int32_t bits;
 233 #endif
 234 #ifdef DEC_FDDI
 235         int link_layer;
 236 #endif /* DEC_FDDI */
 237
 238         /* Open a BPF device and hang it on this interface... */
 239         info -> rfdesc = if_register_bpf (info);
 240
 241         /* Make sure the BPF version is in range... */
 242         if (ioctl (info -> rfdesc, BIOCVERSION, &v) < 0)
 243                 log_fatal ("Can't get BPF version: %m");
 244
 245         if (v.bv_major != BPF_MAJOR_VERSION ||
 246             v.bv_minor < BPF_MINOR_VERSION)
 247                 log_fatal ("BPF version mismatch - recompile DHCP!");
 248
 249         /* Set immediate mode so that reads return as soon as a packet
 250            comes in, rather than waiting for the input buffer to fill with
 251            packets. */
 252         if (ioctl (info -> rfdesc, BIOCIMMEDIATE, &flag) < 0)
 253                 log_fatal ("Can't set immediate mode on bpf device: %m");
 254
 255 #ifdef NEED_OSF_PFILT_HACKS
 256         /* Allow the copyall flag to be set... */
 257         if (ioctl(info -> rfdesc, EIOCALLOWCOPYALL, &flag) < 0)
 258                 log_fatal ("Can't set ALLOWCOPYALL: %m");
 259
 260         /* Clear all the packet filter mode bits first... */
 261         bits = 0;
 262         if (ioctl (info -> rfdesc, EIOCMBIS, &bits) < 0)
 263                 log_fatal ("Can't clear pfilt bits: %m");
 264
 265         /* Set the ENBATCH, ENCOPYALL, ENBPFHDR bits... */
 266         bits = ENBATCH | ENCOPYALL | ENBPFHDR;
 267         if (ioctl (info -> rfdesc, EIOCMBIS, &bits) < 0)
 268                 log_fatal ("Can't set ENBATCH|ENCOPYALL|ENBPFHDR: %m");
 269 #endif
 270         /* Get the required BPF buffer length from the kernel. */
 271         if (ioctl (info -> rfdesc, BIOCGBLEN, &info -> rbuf_max) < 0)
 272                 log_fatal ("Can't get bpf buffer length: %m");
 273         info -> rbuf = dmalloc (info -> rbuf_max, MDL);
 274         if (!info -> rbuf)
 275                 log_fatal ("Can't allocate %ld bytes for bpf input buffer.",
 276                            (long)(info -> rbuf_max));
 277         info -> rbuf_offset = 0;
 278         info -> rbuf_len = 0;
 279
 280         /* Set up the bpf filter program structure. */
 281         p.bf_len = dhcp_bpf_filter_len;
 282
 283 #ifdef DEC_FDDI
 284         /* See if this is an FDDI interface, flag it for later. */
 285         if (ioctl(info -> rfdesc, BIOCGDLT, &link_layer) >= 0 &&
 286             link_layer == DLT_FDDI) {
 287                 if (!bpf_fddi_filter) {
 288                         bpf_fddi_filter = dmalloc (sizeof dhcp_bpf_filter,
 289                                                     MDL);
 290                         if (!bpf_fddi_filter)
 291                                 log_fatal ("No memory for FDDI filter.");
 292                         memcpy (bpf_fddi_filter,
 293                                 dhcp_bpf_filter, sizeof dhcp_bpf_filter);
 294                         /* Patch the BPF program to account for the difference
 295                            in length between ethernet headers (14), FDDI and
 296                            802.2 headers (16 +8=24, +10).
 297                            XXX changes to filter program may require changes to
 298                            XXX the insn number(s) used below! */
 299                         bpf_fddi_filter[0].k += 10;
 300                         bpf_fddi_filter[2].k += 10;
 301                         bpf_fddi_filter[4].k += 10;
 302                         bpf_fddi_filter[6].k += 10;
 303                         bpf_fddi_filter[7].k += 10;
 304                 }
 305                 p.bf_insns = bpf_fddi_filter;
 306         } else
 307 #endif /* DEC_FDDI */
 308         p.bf_insns = dhcp_bpf_filter;
 309
 310         /* Patch the server port into the BPF  program...
 311            XXX changes to filter program may require changes
 312            to the insn number(s) used below! XXX */
 313         dhcp_bpf_filter [8].k = ntohs (local_port);
 314
 315         if (ioctl (info -> rfdesc, BIOCSETF, &p) < 0)
 316                 log_fatal ("Can't install packet filter program: %m");
 317         if (!quiet_interface_discovery)
 318                 log_info ("Listening on BPF/%s/%s%s%s",
 319                       info -> name,
 320                       print_hw_addr (info -> hw_address.hbuf [0],
 321                                      info -> hw_address.hlen - 1,
 322                                      &info -> hw_address.hbuf [1]),
 323                       (info -> shared_network ? "/" : ""),
 324                       (info -> shared_network ?
 325                        info -> shared_network -> name : ""));
 326 }
 327
 328 void if_deregister_receive (info)
 329         struct interface_info *info;
 330 {
 331         close (info -> rfdesc);
 332         info -> rfdesc = -1;
 333
 334         if (!quiet_interface_discovery)
 335                 log_info ("Disabling input on BPF/%s/%s%s%s",
 336                       info -> name,
 337                       print_hw_addr (info -> hw_address.hbuf [0],
 338                                      info -> hw_address.hlen - 1,
 339                                      &info -> hw_address.hbuf [1]),
 340                       (info -> shared_network ? "/" : ""),
 341                       (info -> shared_network ?
 342                        info -> shared_network -> name : ""));
 343 }
 344 #endif /* USE_BPF_RECEIVE */
 345
 346 #ifdef USE_BPF_SEND
 347 ssize_t send_packet (interface, packet, raw, len, from, to, hto)
 348         struct interface_info *interface;
 349         struct packet *packet;
 350         struct dhcp_packet *raw;
 351         size_t len;
 352         struct in_addr from;
 353         struct sockaddr_in *to;
 354         struct hardware *hto;
 355 {
 356         unsigned hbufp = 0, ibufp = 0;
 357         double hw [4];
 358         double ip [32];
 359         struct iovec iov [3];
 360         int result;
 361
 362         if (!strcmp (interface -> name, "fallback"))
 363                 return send_fallback (interface, packet, raw,
 364                                       len, from, to, hto);
 365
 366         if (hto == NULL && interface->anycast_mac_addr.hlen)
 367                 hto = &interface->anycast_mac_addr;
 368
 369         /* Assemble the headers... */
 370         assemble_hw_header (interface, (unsigned char *)hw, &hbufp, hto);
 371         assemble_udp_ip_header (interface,
 372                                 (unsigned char *)ip, &ibufp, from.s_addr,
 373                                 to -> sin_addr.s_addr, to -> sin_port,
 374                                 (unsigned char *)raw, len);
 375
 376         /* Fire it off */
 377         iov [0].iov_base = ((char *)hw);
 378         iov [0].iov_len = hbufp;
 379         iov [1].iov_base = ((char *)ip);
 380         iov [1].iov_len = ibufp;
 381         iov [2].iov_base = (char *)raw;
 382         iov [2].iov_len = len;
 383
 384         result = writev(interface -> wfdesc, iov, 3);
 385         if (result < 0)
 386                 log_error ("send_packet: %m");
 387         return result;
 388 }
 389 #endif /* USE_BPF_SEND */
 390
 391 #ifdef USE_BPF_RECEIVE
 392 ssize_t receive_packet (interface, buf, len, from, hfrom)
 393         struct interface_info *interface;
 394         unsigned char *buf;
 395         size_t len;
 396         struct sockaddr_in *from;
 397         struct hardware *hfrom;
 398 {
 399         int length = 0;
 400         int offset = 0;
 401         struct bpf_hdr hdr;
 402         unsigned paylen;
 403
 404         /* All this complexity is because BPF doesn't guarantee
 405            that only one packet will be returned at a time.   We're
 406            getting what we deserve, though - this is a terrible abuse
 407            of the BPF interface.   Sigh. */
 408
 409         /* Process packets until we get one we can return or until we've
 410            done a read and gotten nothing we can return... */
 411
 412         /* If the buffer is empty, fill it. */
 413         if (interface->rbuf_offset >= interface->rbuf_len) {
 414                 length = read(interface->rfdesc, interface->rbuf,
 415                               (size_t)interface->rbuf_max);
 416                 if (length <= 0) {
 417 #ifdef __FreeBSD__
 418                         if (errno == ENXIO) {
 419 #else
 420                         if (errno == EIO) {
 421 #endif
 422                                 dhcp_interface_remove
 423                                         ((omapi_object_t *)interface, NULL);
 424                         }
 425                         return (length);
 426                 }
 427                 interface->rbuf_offset = 0;
 428                 interface->rbuf_len = BPF_WORDALIGN(length);
 429         }
 430
 431         do {
 432                 /* If there isn't room for a whole bpf header, something went
 433                    wrong, but we'll ignore it and hope it goes away... XXX */
 434                 if (interface->rbuf_len -
 435                     interface->rbuf_offset < sizeof hdr) {
 436                         interface->rbuf_offset = interface->rbuf_len;
 437                         continue;
 438                 }
 439
 440                 /* Copy out a bpf header... */
 441                 memcpy(&hdr, &interface->rbuf[interface->rbuf_offset],
 442                        sizeof hdr);
 443
 444                 /* If the bpf header plus data doesn't fit in what's left
 445                    of the buffer, stick head in sand yet again... */
 446                 if (interface->rbuf_offset +
 447                     hdr.bh_hdrlen + hdr.bh_caplen > interface->rbuf_len) {
 448                         interface->rbuf_offset = interface->rbuf_len;
 449                         continue;
 450                 }
 451
 452                 /* If the captured data wasn't the whole packet, or if
 453                    the packet won't fit in the input buffer, all we
 454                    can do is drop it. */
 455                 if (hdr.bh_caplen != hdr.bh_datalen) {
 456                         interface->rbuf_offset =
 457                                 BPF_WORDALIGN(interface->rbuf_offset +
 458                                               hdr.bh_hdrlen + hdr.bh_caplen);
 459                         continue;
 460                 }
 461
 462                 /* Skip over the BPF header... */
 463                 interface->rbuf_offset += hdr.bh_hdrlen;
 464
 465                 /* Decode the physical header... */
 466                 offset = decode_hw_header(interface, interface->rbuf,
 467                                           interface->rbuf_offset, hfrom);
 468
 469                 /* If a physical layer checksum failed (dunno of any
 470                    physical layer that supports this, but WTH), skip this
 471                    packet. */
 472                 if (offset < 0) {
 473                         interface->rbuf_offset =
 474                                 BPF_WORDALIGN(interface->rbuf_offset +
 475                                               hdr.bh_caplen);
 476                         continue;
 477                 }
 478                 interface->rbuf_offset += offset;
 479                 hdr.bh_caplen -= offset;
 480
 481                 /* Decode the IP and UDP headers... */
 482                 offset = decode_udp_ip_header(interface, interface->rbuf,
 483                                               interface->rbuf_offset,
 484                                               from, hdr.bh_caplen, &paylen, 1);
 485
 486                 /* If the IP or UDP checksum was bad, skip the packet... */
 487                 if (offset < 0) {
 488                         interface->rbuf_offset =
 489                                 BPF_WORDALIGN(interface->rbuf_offset +
 490                                               hdr.bh_caplen);
 491                         continue;
 492                 }
 493                 interface->rbuf_offset = interface->rbuf_offset + offset;
 494                 hdr.bh_caplen -= offset;
 495
 496                 /* If there's not enough room to stash the packet data,
 497                    we have to skip it (this shouldn't happen in real
 498                    life, though). */
 499                 if (hdr.bh_caplen > len) {
 500                         interface->rbuf_offset =
 501                                 BPF_WORDALIGN(interface->rbuf_offset +
 502                                                hdr.bh_caplen);
 503                         continue;
 504                 }
 505
 506                 /* Copy out the data in the packet... */
 507                 memcpy(buf, interface->rbuf + interface->rbuf_offset, paylen);
 508                 interface->rbuf_offset =
 509                         BPF_WORDALIGN(interface->rbuf_offset + hdr.bh_caplen);
 510                 return paylen;
 511         } while (interface->rbuf_offset < interface->rbuf_len);
 512
 513         return (0);
 514 }
 515
 516 int can_unicast_without_arp (ip)
 517         struct interface_info *ip;
 518 {
 519         return 1;
 520 }
 521
 522 int can_receive_unicast_unconfigured (ip)
 523         struct interface_info *ip;
 524 {
 525         return 1;
 526 }
 527
 528 int supports_multiple_interfaces (ip)
 529         struct interface_info *ip;
 530 {
 531         return 1;
 532 }
 533
 534 void maybe_setup_fallback ()
 535 {
 536         isc_result_t status;
 537         struct interface_info *fbi = (struct interface_info *)0;
 538         if (setup_fallback (&fbi, MDL)) {
 539                 if_register_fallback (fbi);
 540                 status = omapi_register_io_object ((omapi_object_t *)fbi,
 541                                                    if_readsocket, 0,
 542                                                    fallback_discard, 0, 0);
 543                 if (status != ISC_R_SUCCESS)
 544                         log_fatal ("Can't register I/O handle for %s: %s",
 545                                    fbi -> name, isc_result_totext (status));
 546                 interface_dereference (&fbi, MDL);
 547         }
 548 }
 549 #endif
 550
 551 #if defined(USE_BPF_RECEIVE) || defined(USE_BPF_HWADDR)
 552 void
 553 get_hw_addr(const char *name, struct hardware *hw) {
 554         struct ifaddrs *ifa;
 555         struct ifaddrs *p;
 556         struct sockaddr_dl *sa;
 557
 558         if (getifaddrs(&ifa) != 0) {
 559                 log_fatal("Error getting interface information; %m");
 560         }
 561
 562         /*
 563          * Loop through our interfaces finding a match.
 564          */
 565         sa = NULL;
 566         for (p=ifa; (p != NULL) && (sa == NULL); p = p->ifa_next) {
 567                 if ((p->ifa_addr->sa_family == AF_LINK) &&
 568                     !strcmp(p->ifa_name, name)) {
 569                         sa = (struct sockaddr_dl *)p->ifa_addr;
 570                 }
 571         }
 572         if (sa == NULL) {
 573                 log_fatal("No interface called '%s'", name);
 574         }
 575
 576         /*
 577          * Pull out the appropriate information.
 578          */
 579         switch (sa->sdl_type) {
 580                 case IFT_ETHER:
 581 #if defined (IFT_L2VLAN)
 582                 case IFT_L2VLAN:
 583 #endif
 584                         hw->hlen = sa->sdl_alen + 1;
 585                         hw->hbuf[0] = HTYPE_ETHER;
 586                         memcpy(&hw->hbuf[1], LLADDR(sa), sa->sdl_alen);
 587                         break;
 588                 case IFT_ISO88023:
 589                 case IFT_ISO88024: /* "token ring" */
 590                 case IFT_ISO88025:
 591                 case IFT_ISO88026:
 592                         hw->hlen = sa->sdl_alen + 1;
 593                         hw->hbuf[0] = HTYPE_IEEE802;
 594                         memcpy(&hw->hbuf[1], LLADDR(sa), sa->sdl_alen);
 595                         break;
 596 #ifdef IFT_FDDI
 597                 case IFT_FDDI:
 598                         hw->hlen = sa->sdl_alen + 1;
 599                         hw->hbuf[0] = HTYPE_FDDI;
 600                         memcpy(&hw->hbuf[1], LLADDR(sa), sa->sdl_alen);
 601                         break;
 602 #endif /* IFT_FDDI */
 603                 default:
 604                         log_fatal("Unsupported device type %d for \"%s\"",
 605                                   sa->sdl_type, name);
 606         }
 607
 608         freeifaddrs(ifa);
 609 }
 610 #endif