FreeBSD/Linux Kernel Cross Reference
sys/net/if_dl.h
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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)if_dl.h 8.1 (Berkeley) 6/10/93
30 * $FreeBSD: src/sys/net/if_dl.h,v 1.14 2005/01/07 01:45:34 imp Exp $
31 */
32
33 #ifndef _NET_IF_DL_H_
34 #define _NET_IF_DL_H_
35
36 /*
37 * A Link-Level Sockaddr may specify the interface in one of two
38 * ways: either by means of a system-provided index number (computed
39 * anew and possibly differently on every reboot), or by a human-readable
40 * string such as "il0" (for managerial convenience).
41 *
42 * Census taking actions, such as something akin to SIOCGCONF would return
43 * both the index and the human name.
44 *
45 * High volume transactions (such as giving a link-level ``from'' address
46 * in a recvfrom or recvmsg call) may be likely only to provide the indexed
47 * form, (which requires fewer copy operations and less space).
48 *
49 * The form and interpretation of the link-level address is purely a matter
50 * of convention between the device driver and its consumers; however, it is
51 * expected that all drivers for an interface of a given if_type will agree.
52 */
53
54 /*
55 * Structure of a Link-Level sockaddr:
56 */
57 struct sockaddr_dl {
58 u_char sdl_len; /* Total length of sockaddr */
59 u_char sdl_family; /* AF_LINK */
60 u_short sdl_index; /* if != 0, system given index for interface */
61 u_char sdl_type; /* interface type */
62 u_char sdl_nlen; /* interface name length, no trailing 0 reqd. */
63 u_char sdl_alen; /* link level address length */
64 u_char sdl_slen; /* link layer selector length */
65 char sdl_data[46]; /* minimum work area, can be larger;
66 contains both if name and ll address */
67 };
68
69 #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
70
71 #ifndef _KERNEL
72
73 #include <sys/cdefs.h>
74
75 __BEGIN_DECLS
76 void link_addr(const char *, struct sockaddr_dl *);
77 char *link_ntoa(const struct sockaddr_dl *);
78 __END_DECLS
79
80 #endif /* !_KERNEL */
81
82 #endif
83
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