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/*
 * Fundamental constants relating to ethernet.
 *
 * $Id: ethernet.h,v 1.2 2001-09-27 12:01:54 chris Exp $
 *
 */
 
#ifndef _NET_ETHERNET_H_
#define _NET_ETHERNET_H_
 
/*
 * The number of bytes in an ethernet (MAC) address.
 */
#define	ETHER_ADDR_LEN		6
 
/*
 * The number of bytes in the type field.
 */
#define	ETHER_TYPE_LEN		2
 
/*
 * The number of bytes in the trailing CRC field.
 */
#define	ETHER_CRC_LEN		4
 
/*
 * The length of the combined header.
 */
#define	ETHER_HDR_LEN		(ETHER_ADDR_LEN*2+ETHER_TYPE_LEN)
 
/*
 * The minimum packet length.
 */
#define	ETHER_MIN_LEN		64
 
/*
 * The maximum packet length.
 */
#define	ETHER_MAX_LEN		1518
 
/*
 * A macro to validate a length with
 */
#define	ETHER_IS_VALID_LEN(foo)	\
	((foo) >= ETHER_MIN_LEN && (foo) <= ETHER_MAX_LEN)
 
/*
 * Structure of a 10Mb/s Ethernet header.
 */
struct	ether_header {
	u_char	ether_dhost[ETHER_ADDR_LEN];
	u_char	ether_shost[ETHER_ADDR_LEN];
	u_short	ether_type;
};
 
/*
 * Structure of a 48-bit Ethernet address.
 */
struct	ether_addr {
	u_char octet[ETHER_ADDR_LEN];
};
 
#endif