97 lines
2.1 KiB
C
97 lines
2.1 KiB
C
/*
|
|
* Fundamental constants relating to ethernet.
|
|
*
|
|
* $Id$
|
|
*
|
|
*/
|
|
|
|
#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];
|
|
};
|
|
|
|
#define ETHERTYPE_PUP 0x0200 /* PUP protocol */
|
|
#define ETHERTYPE_IP 0x0800 /* IP protocol */
|
|
#define ETHERTYPE_ARP 0x0806 /* Addr. resolution protocol */
|
|
#define ETHERTYPE_REVARP 0x8035 /* reverse Addr. resolution protocol */
|
|
#define ETHERTYPE_LOOPBACK 0x9000 /* used to test interfaces */
|
|
/* XXX - add more useful types here */
|
|
|
|
/*
|
|
* 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 (ETHER_MAX_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
|
|
#define ETHERMIN (ETHER_MIN_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
|
|
|
|
#ifndef KERNEL
|
|
#include <sys/cdefs.h>
|
|
|
|
/*
|
|
* Ethernet address conversion/parsing routines.
|
|
*/
|
|
__BEGIN_DECLS
|
|
struct ether_addr *ether_aton __P((char *));
|
|
int ether_hostton __P((char *, struct ether_addr *));
|
|
int ether_line __P((char *, struct ether_addr *, char *));
|
|
char *ether_ntoa __P((struct ether_addr *));
|
|
int ether_ntohost __P((char *, struct ether_addr *));
|
|
__END_DECLS
|
|
#endif /* !KERNEL */
|
|
|
|
#endif /* !_NET_ETHERNET_H_ */
|