external/bsd/tcpdump/dist/ether.h

   1 /*
   2  * Copyright (c) 1982, 1986, 1993
   3  *      The Regents of the University of California.  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 University 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 REGENTS 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 REGENTS 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  *      @(#)if_ether.h  8.3 (Berkeley) 5/2/95
  30  */
  31
  32 #define ETHERMTU        1500
  33
  34 /*
  35  * The number of bytes in an ethernet (MAC) address.
  36  */
  37 #define ETHER_ADDR_LEN          6
  38
  39 /*
  40  * Structure of a DEC/Intel/Xerox or 802.3 Ethernet header.
  41  */
  42 struct  ether_header {
  43         uint8_t         ether_dhost[ETHER_ADDR_LEN];
  44         uint8_t         ether_shost[ETHER_ADDR_LEN];
  45         uint16_t        ether_type;
  46 };
  47
  48 /*
  49  * Length of a DEC/Intel/Xerox or 802.3 Ethernet header; note that some
  50  * compilers may pad "struct ether_header" to a multiple of 4 bytes,
  51  * for example, so "sizeof (struct ether_header)" may not give the right
  52  * answer.
  53  */
  54 #define ETHER_HDRLEN            14