1 //==========================================================================
3 // include/net/if_arp.h
7 //==========================================================================
8 //####BSDCOPYRIGHTBEGIN####
10 // -------------------------------------------
12 // Portions of this software may have been derived from OpenBSD or other sources,
13 // and are covered by the appropriate copyright disclaimers included herein.
15 // -------------------------------------------
17 //####BSDCOPYRIGHTEND####
18 //==========================================================================
19 //#####DESCRIPTIONBEGIN####
22 // Contributors: gthomas
28 //####DESCRIPTIONEND####
30 //==========================================================================
33 /* $OpenBSD: if_arp.h,v 1.3 1999/07/30 22:22:19 fgsch Exp $ */
34 /* $NetBSD: if_arp.h,v 1.8 1995/03/08 02:56:52 cgd Exp $ */
37 * Copyright (c) 1986, 1993
38 * The Regents of the University of California. All rights reserved.
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
48 * 3. All advertising materials mentioning features or use of this software
49 * must display the following acknowledgement:
50 * This product includes software developed by the University of
51 * California, Berkeley and its contributors.
52 * 4. Neither the name of the University nor the names of its contributors
53 * may be used to endorse or promote products derived from this software
54 * without specific prior written permission.
56 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
58 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
59 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
60 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
61 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
62 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
64 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
65 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
68 * @(#)if_arp.h 8.1 (Berkeley) 6/10/93
71 #ifndef _NET_IF_ARP_H_
72 #define _NET_IF_ARP_H_
75 * Address Resolution Protocol.
77 * See RFC 826 for protocol description. ARP packets are variable
78 * in size; the arphdr structure defines the fixed-length portion.
79 * Protocol type values are the same as those for 10 Mb/s Ethernet.
80 * It is followed by the variable-sized fields ar_sha, arp_spa,
81 * arp_tha and arp_tpa in that order, according to the lengths
82 * specified. Field names used correspond to RFC 826.
85 u_int16_t ar_hrd; /* format of hardware address */
86 #define ARPHRD_ETHER 1 /* ethernet hardware format */
87 #define ARPHRD_IEEE802 6 /* IEEE 802 hardware format */
88 #define ARPHRD_FRELAY 15 /* frame relay hardware format */
89 u_int16_t ar_pro; /* format of protocol address */
90 u_int8_t ar_hln; /* length of hardware address */
91 u_int8_t ar_pln; /* length of protocol address */
92 u_int16_t ar_op; /* one of: */
93 #define ARPOP_REQUEST 1 /* request to resolve address */
94 #define ARPOP_REPLY 2 /* response to previous request */
95 #define ARPOP_REVREQUEST 3 /* request protocol address given hardware */
96 #define ARPOP_REVREPLY 4 /* response giving protocol address */
97 #define ARPOP_INVREQUEST 8 /* request to identify peer */
98 #define ARPOP_INVREPLY 9 /* response identifying peer */
100 * The remaining fields are variable in size,
101 * according to the sizes above.
104 u_int8_t ar_sha[]; /* sender hardware address */
105 u_int8_t ar_spa[]; /* sender protocol address */
106 u_int8_t ar_tha[]; /* target hardware address */
107 u_int8_t ar_tpa[]; /* target protocol address */
115 struct sockaddr arp_pa; /* protocol address */
116 struct sockaddr arp_ha; /* hardware address */
117 int arp_flags; /* flags */
119 /* arp_flags and at_flags field values */
120 #define ATF_INUSE 0x01 /* entry in use */
121 #define ATF_COM 0x02 /* completed entry (enaddr valid) */
122 #define ATF_PERM 0x04 /* permanent entry */
123 #define ATF_PUBL 0x08 /* publish entry (respond for other host) */
124 #define ATF_USETRAILERS 0x10 /* has requested trailers */
126 #endif // _NET_IF_ARP_H_