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ethernet_stub.h

/*
 * Fundamental constants relating to ethernet.
 *
 * $FreeBSD: src/sys/net/ethernet.h,v 1.9.2.1 1999/08/29 16:28:13 peter Exp $
 * $Id: ethernet_stub.h,v 1.4 2000/11/03 12:39:22 pherman Exp $
 *
 */

#ifndef _ETHERNET_STUB_H_
#define _ETHERNET_STUB_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.
 */
00051 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.
 */
00060 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_VLAN          0x8100 /* IEEE 802.1Q VLAN tagging */
#define     ETHERTYPE_IPV6          0x86dd  /* IPv6 */
#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)

#ifdef  I_NEED_ETHER_PROTOS
# 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 /* I_NEED_ETHER_PROTOS */
#endif /* !_ETHERNET_STUB_H_ */

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