/* Copyright (C) 1997, 1999, 2001, 2008 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

/* Based on the FreeBSD version of this file. Curiously, that file
   lacks a copyright in the header. */

#ifndef __NET_ETHERNET_H
#define __NET_ETHERNET_H 1

#include <sys/cdefs.h>
#include <sys/types.h>
#include <linux/if_ether.h>     /* IEEE 802.3 Ethernet constants */

__BEGIN_DECLS

/* This is a name for the 48 bit ethernet address available on many
   systems.  */
struct ether_addr
{
  u_int8_t ether_addr_octet[ETH_ALEN];
} __attribute__ ((__packed__));

/* 10Mb/s ethernet header */
struct ether_header
{
  u_int8_t  ether_dhost[ETH_ALEN];        /* destination eth addr        */
  u_int8_t  ether_shost[ETH_ALEN];        /* source ether addr        */
  u_int16_t ether_type;                        /* packet type ID field        */
} __attribute__ ((__packed__));

/* Ethernet protocol ID's */
#define        ETHERTYPE_PUP                0x0200          /* Xerox PUP */
#define ETHERTYPE_SPRITE        0x0500                /* Sprite */
#define        ETHERTYPE_IP                0x0800                /* IP */
#define        ETHERTYPE_ARP                0x0806                /* Address resolution */
#define        ETHERTYPE_REVARP        0x8035                /* Reverse ARP */
#define ETHERTYPE_AT                0x809B                /* AppleTalk protocol */
#define ETHERTYPE_AARP                0x80F3                /* AppleTalk ARP */
#define        ETHERTYPE_VLAN                0x8100                /* IEEE 802.1Q VLAN tagging */
#define ETHERTYPE_IPX                0x8137                /* IPX */
#define        ETHERTYPE_IPV6                0x86dd                /* IP protocol version 6 */
#define ETHERTYPE_LOOPBACK        0x9000                /* used to test interfaces */


#define        ETHER_ADDR_LEN        ETH_ALEN                 /* size of ethernet addr */
#define        ETHER_TYPE_LEN        2                        /* bytes in type field */
#define        ETHER_CRC_LEN        4                        /* bytes in CRC field */
#define        ETHER_HDR_LEN        ETH_HLEN                 /* total octets in header */
#define        ETHER_MIN_LEN        (ETH_ZLEN + ETHER_CRC_LEN) /* min packet length */
#define        ETHER_MAX_LEN        (ETH_FRAME_LEN + ETHER_CRC_LEN) /* max packet length */

/* make sure ethenet length is valid */
#define        ETHER_IS_VALID_LEN(foo)        \
        ((foo) >= ETHER_MIN_LEN && (foo) <= ETHER_MAX_LEN)

/*
 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed
 * by an ETHER type (as given above) and then the (variable-length) header.
 */
#define        ETHERTYPE_TRAIL                0x1000                /* Trailer packet */
#define        ETHERTYPE_NTRAILER        16

#define        ETHERMTU        ETH_DATA_LEN
#define        ETHERMIN        (ETHER_MIN_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN)

__END_DECLS

#endif        /* net/ethernet.h */