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if_ether.h revision 1.2 
      1 /*
      2  * Copyright (c) 1982, 1986 Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  *
     33  *	@(#)if_ether.h	7.5 (Berkeley) 6/28/90
     34  */
     35 
     36 #ifndef _NETINET_IF_ETHER_H_
     37 #define _NETINET_IF_ETHER_H_
     38 
     39 /*
     40  * Structure of a 10Mb/s Ethernet header.
     41  */
     42 struct	ether_header {
     43 	u_char	ether_dhost[6];
     44 	u_char	ether_shost[6];
     45 	u_short	ether_type;
     46 };
     47 
     48 #define	ETHERTYPE_PUP	0x0200		/* PUP protocol */
     49 #define	ETHERTYPE_IP	0x0800		/* IP protocol */
     50 #define ETHERTYPE_ARP	0x0806		/* Addr. resolution protocol */
     51 
     52 /*
     53  * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
     54  * (type-ETHERTYPE_TRAIL)*512 bytes of data followed
     55  * by an ETHER type (as given above) and then the (variable-length) header.
     56  */
     57 #define	ETHERTYPE_TRAIL		0x1000		/* Trailer packet */
     58 #define	ETHERTYPE_NTRAILER	16
     59 
     60 #define	ETHERMTU	1500
     61 #define	ETHERMIN	(60-14)
     62 
     63 /*
     64  * Ethernet Address Resolution Protocol.
     65  *
     66  * See RFC 826 for protocol description.  Structure below is adapted
     67  * to resolving internet addresses.  Field names used correspond to
     68  * RFC 826.
     69  */
     70 struct	ether_arp {
     71 	struct	arphdr ea_hdr;	/* fixed-size header */
     72 	u_char	arp_sha[6];	/* sender hardware address */
     73 	u_char	arp_spa[4];	/* sender protocol address */
     74 	u_char	arp_tha[6];	/* target hardware address */
     75 	u_char	arp_tpa[4];	/* target protocol address */
     76 };
     77 #define	arp_hrd	ea_hdr.ar_hrd
     78 #define	arp_pro	ea_hdr.ar_pro
     79 #define	arp_hln	ea_hdr.ar_hln
     80 #define	arp_pln	ea_hdr.ar_pln
     81 #define	arp_op	ea_hdr.ar_op
     82 
     83 
     84 /*
     85  * Structure shared between the ethernet driver modules and
     86  * the address resolution code.  For example, each ec_softc or il_softc
     87  * begins with this structure.
     88  */
     89 struct	arpcom {
     90 	struct 	ifnet ac_if;		/* network-visible interface */
     91 	u_char	ac_enaddr[6];		/* ethernet hardware address */
     92 	struct in_addr ac_ipaddr;	/* copy of ip address- XXX */
     93 };
     94 
     95 /*
     96  * Internet to ethernet address resolution table.
     97  */
     98 struct	arptab {
     99 	struct	in_addr at_iaddr;	/* internet address */
    100 	u_char	at_enaddr[6];		/* ethernet address */
    101 	u_char	at_timer;		/* minutes since last reference */
    102 	u_char	at_flags;		/* flags */
    103 	struct	mbuf *at_hold;		/* last packet until resolved/timeout */
    104 };
    105 
    106 #ifdef	KERNEL
    107 u_char	etherbroadcastaddr[6];
    108 struct	arptab *arptnew();
    109 int	ether_output(), ether_input();
    110 char	*ether_sprintf();
    111 #endif
    112 
    113 #endif /* !_NETINET_IF_ETHER_H_ */
    114