if_ether.h

<B>Digital的Unix操作系统VAX 4.2源码</B>

/* static	char	*sccsid = "@(#)if_ether.h	4.2	(ULTRIX)	9/6/90"; */

/************************************************************************
 *									*
 *			Copyright (c) 1985 by				*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any  other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived  from  software  received  from  the	*
 *   University    of   California,   Berkeley,   and   from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is  subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or  reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/

/************************************************************************
 *			Modification History				*
 *									*
 *	
 *	15-Jan-88	lp
 *		Merge of final 43BSD changes.
 *
 *	Larry Cohen  -	09/16/85					*
 * 		Add 43bsd alpha tape changes for subnet routing		*
 *									*
 ************************************************************************/

/*
 * Copyright (c) 1982 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *	if_ether.h	6.5 (Berkeley) 6/8/85
 */

/*
 * Structure of a 10Mb/s Ethernet header.
 */
struct	ether_header {
	u_char	ether_dhost[6];
	u_char	ether_shost[6];
	u_short	ether_type;
};

/* definition of ether_addr, for ethers(3n) */
struct ether_addr {
	u_char  ether_addr_octet[6];
};

#define	ETHERTYPE_PUP	0x0200		/* PUP protocol */
#define ETHERTYPE_NS	0x0600		/* XNS protocol */
#define	ETHERTYPE_IP	0x0800		/* IP protocol */
#define ETHERTYPE_ARP	0x0806		/* Addr. resolution protocol */
#define ETHERTYPE_DN	0x6003		/* DECnet protocol */
#define ETHERTYPE_LAT	0x6004		/* LAT protocol */
#define ETHERTYPE_ATALK	0x809B		/* Appletalk */
#define ETHERTYPE_AARP	0x80F3		/* Appletalk Arp */
#define ETHERTYPE_RARP	0x8035		/* Reverse Arp */
#define ETHERTYPE_LOOP  0x9000          /* Mop Loopback protocol */
#define ETHERTYPE_RC    0x6002          /* MOP Remote Console protocol */


/*
 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
 * (type-ETHERPUP_TRAIL)*512 bytes of data followed
 * by a PUP type (as given above) and then the (variable-length) header.
 */
#define	ETHERTYPE_TRAIL		0x1000		/* Trailer packet */
#define	ETHERTYPE_NTRAILER	16

#define	ETHERMTU	1500
#define	ETHERMIN	(60-14)

/*
 * Ethernet Address Resolution Protocol.
 *
 * See RFC 826 for protocol description.  Structure below is adapted
 * to resolving internet addresses.  Field names used correspond to 
 * RFC 826.
 */
struct	ether_arp {
	struct arphdr ea_hdr;	/* fixed-size header */
#define ARPHRD_ETHER 	1	/* ethernet hardware address */
#define ARPHRD_802 	6	/* fddi hardware address */
#define	ARPOP_REQUEST	1	/* request to resolve address */
#define	ARPOP_REPLY	2	/* response to previous request */
	u_char	arp_sha[6];	/* sender hardware address */
	u_char	arp_spa[4];	/* sender protocol address */
	u_char	arp_tha[6];	/* target hardware address */
	u_char	arp_tpa[4];	/* target protocol address */
};
#define arp_hrd	ea_hdr.ar_hrd
#define arp_pro ea_hdr.ar_pro
#define arp_hln ea_hdr.ar_hln
#define arp_pln ea_hdr.ar_pln
#define arp_op 	ea_hdr.ar_op

/*
 * Structure shared between the ethernet driver modules and
 * the address resolution code.  For example, each ec_softc or il_softc
 * begins with this structure.
 */
struct	arpcom {
	struct 	ifnet ac_if;		/* network-visible interface */
	u_char	ac_enaddr[6];		/* ethernet hardware address */
	struct in_addr ac_ipaddr;	/* copy of ip address- XXX */
};

/*
 * Internet to ethernet address resolution table.
 */
struct	arptab {
	struct	in_addr at_iaddr;	/* internet address */
	u_char	at_enaddr[6];		/* ethernet address */
	struct	mbuf *at_hold;		/* last packet until resolved/timeout */
	u_char	at_timer;		/* minutes since last reference */
	u_char	at_flags;		/* flags */
};

#ifdef	KERNEL
u_char etherbroadcastaddr[6];
struct	arptab *arptnew();
extern int nETHER; /* defined conf.c */
extern int nFDDI; /* defined conf.c */
char *ether_sprintf();
#endif