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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