common/fddi.c

   1 /* fddi.c
   2
   3    Packet assembly code, originally contributed by Archie Cobbs. */
   4
   5 /*
   6  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   7  * Copyright (c) 1996-2003 by Internet Software Consortium
   8  *
   9  * Permission to use, copy, modify, and distribute this software for any
  10  * purpose with or without fee is hereby granted, provided that the above
  11  * copyright notice and this permission notice appear in all copies.
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  14  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  15  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  16  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  17  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  18  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  19  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  20  *
  21  *   Internet Systems Consortium, Inc.
  22  *   950 Charter Street
  23  *   Redwood City, CA 94063
  24  *   <info@isc.org>
  25  *   http://www.isc.org/
  26  *
  27  * This software has been written for Internet Systems Consortium
  28  * by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
  29  * To learn more about Internet Systems Consortium, see
  30  * ``http://www.isc.org/''.  To learn more about Vixie Enterprises,
  31  * see ``http://www.vix.com''.   To learn more about Nominum, Inc., see
  32  * ``http://www.nominum.com''.
  33  */
  34
  35 #ifndef lint
  36 static char copyright[] =
  37 "$Id: fddi.c,v 1.4 2005/03/17 20:14:58 dhankins Exp $ Copyright (c) 2004 Internet Systems Consortium.  All rights reserved.\n";
  38 #endif /* not lint */
  39
  40 #include "dhcpd.h"
  41
  42 #if defined (DEC_FDDI)
  43 #include <netinet/if_fddi.h>
  44 #include <net/if_llc.h>
  45
  46 #if defined (PACKET_ASSEMBLY) || defined (PACKET_DECODING)
  47 #include "includes/netinet/if_ether.h"
  48 #endif /* PACKET_ASSEMBLY || PACKET_DECODING */
  49
  50 #if defined (PACKET_ASSEMBLY)
  51 /* Assemble an hardware header... */
  52
  53 void assemble_fddi_header (interface, buf, bufix, to)
  54         struct interface_info *interface;
  55         unsigned char *buf;
  56         unsigned *bufix;
  57         struct hardware *to;
  58 {
  59         struct fddi_header   fh;
  60         struct llc     lh;
  61
  62         if (to && to -> hlen == 7)
  63                 memcpy (fh.fddi_dhost, &to -> hbuf [1],
  64                         sizeof (fh.fddi_dhost));
  65         memcpy (fh.fddi_shost,
  66                 &interface -> hw_address.hbuf [1], sizeof (fh.fddi_shost));
  67         fh.fddi_fc = FDDIFC_LLC_ASYNC;
  68         memcpy (&buf [*bufix], &fh, sizeof fh);
  69         *bufix += sizeof fh;
  70
  71         lh.llc_dsap = LLC_SNAP_LSAP;
  72         lh.llc_ssap = LLC_SNAP_LSAP;
  73         lh.llc_un.type_snap.control = LLC_UI;
  74         lh.llc_un.type_snap.ether_type = htons (ETHERTYPE_IP);
  75         memcpy (&buf [*bufix], &lh, LLC_SNAP_LEN);
  76         *bufix += LLC_SNAP_LEN;
  77 }
  78 #endif /* PACKET_ASSEMBLY */
  79
  80 #ifdef PACKET_DECODING
  81 /* Decode a hardware header... */
  82
  83 ssize_t decode_fddi_header (interface, buf, bufix, from)
  84      struct interface_info *interface;
  85      unsigned char *buf;
  86      unsigned bufix;
  87      struct hardware *from;
  88 {
  89         struct fddi_header   fh;
  90         struct llc     lh;
  91
  92         from -> hbuf [0] = HTYPE_FDDI;
  93         memcpy (&from -> hbuf [1], fh.fddi_shost, sizeof fh.fddi_shost);
  94         return FDDI_HEADER_SIZE + LLC_SNAP_LEN;
  95 }
  96 #endif /* PACKET_DECODING */
  97 #endif /* DEC_FDDI */