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/* Copyright (C) 1997, 1999 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
   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 */


/* 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_IP            0x0800            /* IP */
#define     ETHERTYPE_ARP           0x0806            /* Address resolution */
#define     ETHERTYPE_REVARP  0x8035            /* Reverse ARP */

#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 + ETH_CRC_LEN) /* min packet length */
#define     ETHER_MAX_LEN     (ETH_FRAME_LEN + ETH_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


#endif /* net/ethernet.h */

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