Annotation of sys/net/if_arp.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: if_arp.h,v 1.6 2003/06/02 23:28:12 millert Exp $ */
2: /* $NetBSD: if_arp.h,v 1.8 1995/03/08 02:56:52 cgd Exp $ */
3:
4: /*
5: * Copyright (c) 1986, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. Neither the name of the University nor the names of its contributors
17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: *
32: * @(#)if_arp.h 8.1 (Berkeley) 6/10/93
33: */
34:
35: #ifndef _NET_IF_ARP_H_
36: #define _NET_IF_ARP_H_
37: /*
38: * Address Resolution Protocol.
39: *
40: * See RFC 826 for protocol description. ARP packets are variable
41: * in size; the arphdr structure defines the fixed-length portion.
42: * Protocol type values are the same as those for 10 Mb/s Ethernet.
43: * It is followed by the variable-sized fields ar_sha, arp_spa,
44: * arp_tha and arp_tpa in that order, according to the lengths
45: * specified. Field names used correspond to RFC 826.
46: */
47: struct arphdr {
48: u_int16_t ar_hrd; /* format of hardware address */
49: #define ARPHRD_ETHER 1 /* ethernet hardware format */
50: #define ARPHRD_IEEE802 6 /* IEEE 802 hardware format */
51: #define ARPHRD_FRELAY 15 /* frame relay hardware format */
52: #define ARPHRD_IEEE1394 24 /* IEEE 1394 (FireWire) hardware format */
53: u_int16_t ar_pro; /* format of protocol address */
54: u_int8_t ar_hln; /* length of hardware address */
55: u_int8_t ar_pln; /* length of protocol address */
56: u_int16_t ar_op; /* one of: */
57: #define ARPOP_REQUEST 1 /* request to resolve address */
58: #define ARPOP_REPLY 2 /* response to previous request */
59: #define ARPOP_REVREQUEST 3 /* request protocol address given hardware */
60: #define ARPOP_REVREPLY 4 /* response giving protocol address */
61: #define ARPOP_INVREQUEST 8 /* request to identify peer */
62: #define ARPOP_INVREPLY 9 /* response identifying peer */
63: /*
64: * The remaining fields are variable in size,
65: * according to the sizes above.
66: */
67: #ifdef COMMENT_ONLY
68: u_int8_t ar_sha[]; /* sender hardware address */
69: u_int8_t ar_spa[]; /* sender protocol address */
70: u_int8_t ar_tha[]; /* target hardware address */
71: u_int8_t ar_tpa[]; /* target protocol address */
72: #endif
73: };
74:
75: /*
76: * ARP ioctl request
77: */
78: struct arpreq {
79: struct sockaddr arp_pa; /* protocol address */
80: struct sockaddr arp_ha; /* hardware address */
81: int arp_flags; /* flags */
82: };
83: /* arp_flags and at_flags field values */
84: #define ATF_INUSE 0x01 /* entry in use */
85: #define ATF_COM 0x02 /* completed entry (enaddr valid) */
86: #define ATF_PERM 0x04 /* permanent entry */
87: #define ATF_PUBL 0x08 /* publish entry (respond for other host) */
88: #define ATF_USETRAILERS 0x10 /* has requested trailers */
89: #endif /* _NET_IF_ARP_H_ */
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