if_arp.h revision 21673 
1/*
2 * Copyright (c) 1986, 1993
3 *	The Regents of the University of California.  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_arp.h	8.1 (Berkeley) 6/10/93
34 * $FreeBSD: head/sys/net/if_arp.h 21673 1997-01-14 07:20:47Z jkh $
35 */
36
37#ifndef _NET_IF_ARP_H_
38#define	_NET_IF_ARP_H_
39
40/*
41 * Address Resolution Protocol.
42 *
43 * See RFC 826 for protocol description.  ARP packets are variable
44 * in size; the arphdr structure defines the fixed-length portion.
45 * Protocol type values are the same as those for 10 Mb/s Ethernet.
46 * It is followed by the variable-sized fields ar_sha, arp_spa,
47 * arp_tha and arp_tpa in that order, according to the lengths
48 * specified.  Field names used correspond to RFC 826.
49 */
50struct	arphdr {
51	u_short	ar_hrd;		/* format of hardware address */
52#define ARPHRD_ETHER 	1	/* ethernet hardware format */
53#define ARPHRD_FRELAY 	15	/* frame relay hardware format */
54	u_short	ar_pro;		/* format of protocol address */
55	u_char	ar_hln;		/* length of hardware address */
56	u_char	ar_pln;		/* length of protocol address */
57	u_short	ar_op;		/* one of: */
58#define	ARPOP_REQUEST	1	/* request to resolve address */
59#define	ARPOP_REPLY	2	/* response to previous request */
60#define	ARPOP_REVREQUEST 3	/* request protocol address given hardware */
61#define	ARPOP_REVREPLY	4	/* response giving protocol address */
62#define ARPOP_INVREQUEST 8 	/* request to identify peer */
63#define ARPOP_INVREPLY	9	/* response identifying peer */
64/*
65 * The remaining fields are variable in size,
66 * according to the sizes above.
67 */
68#ifdef COMMENT_ONLY
69	u_char	ar_sha[];	/* sender hardware address */
70	u_char	ar_spa[];	/* sender protocol address */
71	u_char	ar_tha[];	/* target hardware address */
72	u_char	ar_tpa[];	/* target protocol address */
73#endif
74};
75
76/*
77 * ARP ioctl request
78 */
79struct arpreq {
80	struct	sockaddr arp_pa;		/* protocol address */
81	struct	sockaddr arp_ha;		/* hardware address */
82	int	arp_flags;			/* flags */
83};
84/*  arp_flags and at_flags field values */
85#define	ATF_INUSE	0x01	/* entry in use */
86#define ATF_COM		0x02	/* completed entry (enaddr valid) */
87#define	ATF_PERM	0x04	/* permanent entry */
88#define	ATF_PUBL	0x08	/* publish entry (respond for other host) */
89#define	ATF_USETRAILERS	0x10	/* has requested trailers */
90
91#endif /* !_NET_IF_ARP_H_ */
92