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