Initial import from FreeBSD RELENG_4:
[dragonfly.git] / sys / net / if_dl.h
CommitLineData
984263bc
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1/*
2 * Copyright (c) 1990, 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_dl.h 8.1 (Berkeley) 6/10/93
34 * $FreeBSD: src/sys/net/if_dl.h,v 1.10 2000/03/01 02:46:25 archie Exp $
35 */
36
37#ifndef _NET_IF_DL_H_
38#define _NET_IF_DL_H_
39
40/*
41 * A Link-Level Sockaddr may specify the interface in one of two
42 * ways: either by means of a system-provided index number (computed
43 * anew and possibly differently on every reboot), or by a human-readable
44 * string such as "il0" (for managerial convenience).
45 *
46 * Census taking actions, such as something akin to SIOCGCONF would return
47 * both the index and the human name.
48 *
49 * High volume transactions (such as giving a link-level ``from'' address
50 * in a recvfrom or recvmsg call) may be likely only to provide the indexed
51 * form, (which requires fewer copy operations and less space).
52 *
53 * The form and interpretation of the link-level address is purely a matter
54 * of convention between the device driver and its consumers; however, it is
55 * expected that all drivers for an interface of a given if_type will agree.
56 */
57
58/*
59 * Structure of a Link-Level sockaddr:
60 */
61struct sockaddr_dl {
62 u_char sdl_len; /* Total length of sockaddr */
63 u_char sdl_family; /* AF_LINK */
64 u_short sdl_index; /* if != 0, system given index for interface */
65 u_char sdl_type; /* interface type */
66 u_char sdl_nlen; /* interface name length, no trailing 0 reqd. */
67 u_char sdl_alen; /* link level address length */
68 u_char sdl_slen; /* link layer selector length */
69 char sdl_data[12]; /* minimum work area, can be larger;
70 contains both if name and ll address */
71 u_short sdl_rcf; /* source routing control */
72 u_short sdl_route[16]; /* source routing information */
73};
74
75#define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
76
77#ifndef _KERNEL
78
79#include <sys/cdefs.h>
80
81__BEGIN_DECLS
82void link_addr __P((const char *, struct sockaddr_dl *));
83char *link_ntoa __P((const struct sockaddr_dl *));
84__END_DECLS
85
86#endif /* !_KERNEL */
87
88#endif