FreeBSD/Linux Kernel Cross Reference
sys/net/if_arp.h
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: src/sys/net/if_arp.h,v 1.6.2.1 1999/09/05 08:17:34 peter Exp $
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 */
50 struct 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 */
79 struct 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_ */
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