dist/tcpdump/ether.h

   1 /*      $NetBSD$        */
   2
   3 /* @(#) Header: /tcpdump/master/tcpdump/ether.h,v 1.8 2002/12/11 07:13:51 guy Exp (LBL) */
   4 /*
   5  * Copyright (c) 1982, 1986, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  *      @(#)if_ether.h  8.3 (Berkeley) 5/2/95
  33  */
  34
  35 #define ETHERMTU        1500
  36
  37 /*
  38  * The number of bytes in an ethernet (MAC) address.
  39  */
  40 #define ETHER_ADDR_LEN          6
  41
  42 /*
  43  * Structure of a DEC/Intel/Xerox or 802.3 Ethernet header.
  44  */
  45 struct  ether_header {
  46         u_int8_t        ether_dhost[ETHER_ADDR_LEN];
  47         u_int8_t        ether_shost[ETHER_ADDR_LEN];
  48         u_int16_t       ether_type;
  49 };
  50
  51 /*
  52  * Length of a DEC/Intel/Xerox or 802.3 Ethernet header; note that some
  53  * compilers may pad "struct ether_header" to a multiple of 4 bytes,
  54  * for example, so "sizeof (struct ether_header)" may not give the right
  55  * answer.
  56  */
  57 #define ETHER_HDRLEN            14