The Tcpdump Group git mirrors - tcpdump/blob - linux-include/netinet/if_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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)if_ether.h  8.3 (Berkeley) 5/2/95
  34  */
  35
  36 #include <net/if_arp.h>
  37
  38 /*
  39  * The number of bytes in an ethernet (MAC) address.
  40  */
  41 #define ETHER_ADDR_LEN          6
  42
  43 /*
  44  * Ethernet address - 6 octets
  45  */
  46 struct ether_addr {
  47         u_char  ether_addr_octet[ETHER_ADDR_LEN];
  48 };
  49
  50 /*
  51  * Structure of a 10Mb/s Ethernet header.
  52  */
  53 struct  ether_header {
  54         u_char  ether_dhost[ETHER_ADDR_LEN];
  55         u_char  ether_shost[ETHER_ADDR_LEN];
  56         u_short ether_type;
  57 };
  58
  59 #define ETHERTYPE_PUP           0x0200  /* PUP protocol */
  60 #define ETHERTYPE_IP            0x0800  /* IP protocol */
  61 #define ETHERTYPE_ARP           0x0806  /* Addr. resolution protocol */
  62 #define ETHERTYPE_REVARP        0x8035  /* reverse Addr. resolution protocol */
  63
  64 /*
  65  * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
  66  * (type-ETHERTYPE_TRAIL)*512 bytes of data followed
  67  * by an ETHER type (as given above) and then the (variable-length) header.
  68  */
  69 #define ETHERTYPE_TRAIL         0x1000          /* Trailer packet */
  70 #define ETHERTYPE_NTRAILER      16
  71
  72 #define ETHERMTU        1500
  73 #define ETHERMIN        (60-14)
  74
  75 /*
  76  * Ethernet Address Resolution Protocol.
  77  *
  78  * See RFC 826 for protocol description.  Structure below is adapted
  79  * to resolving internet addresses.  Field names used correspond to
  80  * RFC 826.
  81  */
  82 struct  ether_arp {
  83         struct  arphdr ea_hdr;  /* fixed-size header */
  84         u_char  arp_sha[6];     /* sender hardware address */
  85         u_char  arp_spa[4];     /* sender protocol address */
  86         u_char  arp_tha[6];     /* target hardware address */
  87         u_char  arp_tpa[4];     /* target protocol address */
  88 };
  89 #define arp_hrd ea_hdr.ar_hrd
  90 #define arp_pro ea_hdr.ar_pro
  91 #define arp_hln ea_hdr.ar_hln
  92 #define arp_pln ea_hdr.ar_pln
  93 #define arp_op  ea_hdr.ar_op