sysdeps/unix/bsd/bsd4.4/kfreebsd/net/ethernet.h

   1 /* Copyright (C) 1997, 1999, 2001, 2006 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 /* Based on the FreeBSD version of this file. Curiously, that file
  20    lacks a copyright in the header. */
  21
  22 #ifndef __NET_ETHERNET_H
  23 #define __NET_ETHERNET_H 1
  24
  25 #include <sys/cdefs.h>
  26 #include <sys/types.h>
  27 #include <net/if_ether.h>     /* IEEE 802.3 Ethernet constants */
  28
  29 __BEGIN_DECLS
  30
  31 /* This is a name for the 48 bit ethernet address available on many
  32    systems.  */
  33 struct ether_addr
  34 {
  35   u_int8_t octet[ETH_ALEN];
  36 #define ether_addr_octet octet
  37 } __attribute__ ((__packed__));
  38
  39 /* 10Mb/s ethernet header */
  40 struct ether_header
  41 {
  42   u_int8_t  ether_dhost[ETH_ALEN];      /* destination eth addr */
  43   u_int8_t  ether_shost[ETH_ALEN];      /* source ether addr    */
  44   u_int16_t ether_type;                 /* packet type ID field */
  45 } __attribute__ ((__packed__));
  46
  47 /* Ethernet protocol ID's */
  48 #define ETHERTYPE_PUP           0x0200          /* Xerox PUP */
  49 #define ETHERTYPE_IP            0x0800          /* IP */
  50 #define ETHERTYPE_ARP           0x0806          /* Address resolution */
  51 #define ETHERTYPE_REVARP        0x8035          /* Reverse ARP */
  52
  53 #define ETHER_ADDR_LEN  ETH_ALEN                 /* size of ethernet addr */
  54 #define ETHER_TYPE_LEN  2                        /* bytes in type field */
  55 #define ETHER_CRC_LEN   4                        /* bytes in CRC field */
  56 #define ETHER_HDR_LEN   ETH_HLEN                 /* total octets in header */
  57 #define ETHER_MIN_LEN   (ETH_ZLEN + ETHER_CRC_LEN) /* min packet length */
  58 #define ETHER_MAX_LEN   (ETH_FRAME_LEN + ETHER_CRC_LEN) /* max packet length */
  59
  60 /* make sure ethenet length is valid */
  61 #define ETHER_IS_VALID_LEN(foo) \
  62         ((foo) >= ETHER_MIN_LEN && (foo) <= ETHER_MAX_LEN)
  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        ETH_DATA_LEN
  73 #define ETHERMIN        (ETHER_MIN_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN)
  74
  75 __END_DECLS
  76
  77 #endif  /* net/ethernet.h */