FreeBSD/Linux Kernel Cross Reference
sys/net/if_dl.h
1 /* $NetBSD: if_dl.h,v 1.14 2005/02/26 22:45:09 perry Exp $ */
2
3 /*
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)if_dl.h 8.1 (Berkeley) 6/10/93
32 */
33
34 /*
35 * A Link-Level Sockaddr may specify the interface in one of two
36 * ways: either by means of a system-provided index number (computed
37 * anew and possibly differently on every reboot), or by a human-readable
38 * string such as "il0" (for managerial convenience).
39 *
40 * Census taking actions, such as something akin to SIOCGCONF would return
41 * both the index and the human name.
42 *
43 * High volume transactions (such as giving a link-level ``from'' address
44 * in a recvfrom or recvmsg call) may be likely only to provide the indexed
45 * form, (which requires fewer copy operations and less space).
46 *
47 * The form and interpretation of the link-level address is purely a matter
48 * of convention between the device driver and its consumers; however, it is
49 * expected that all drivers for an interface of a given if_type will agree.
50 */
51
52 #ifndef _NET_IF_DL_H_
53 #define _NET_IF_DL_H_
54
55 #include <sys/ansi.h>
56
57 #ifndef sa_family_t
58 typedef __sa_family_t sa_family_t;
59 #define sa_family_t __sa_family_t
60 #endif
61
62 /*
63 * Structure of a Link-Level sockaddr:
64 */
65 struct sockaddr_dl {
66 u_char sdl_len; /* Total length of sockaddr */
67 sa_family_t sdl_family; /* AF_LINK */
68 u_int16_t sdl_index; /* if != 0, system given index for interface */
69 u_char sdl_type; /* interface type */
70 u_char sdl_nlen; /* interface name length, no trailing 0 reqd. */
71 u_char sdl_alen; /* link level address length */
72 u_char sdl_slen; /* link layer selector length */
73 char sdl_data[12]; /* minimum work area, can be larger;
74 contains both if name and ll address */
75 };
76
77 #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
78
79 #ifndef _KERNEL
80
81 #include <sys/cdefs.h>
82
83 __BEGIN_DECLS
84 void link_addr __P((const char *, struct sockaddr_dl *));
85 char *link_ntoa __P((const struct sockaddr_dl *));
86 __END_DECLS
87
88 #endif /* !_KERNEL */
89
90 #endif /* _NET_IF_DL_H_ */
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