1 //==========================================================================
7 //==========================================================================
8 //####BSDCOPYRIGHTBEGIN####
10 // -------------------------------------------
12 // Portions of this software may have been derived from OpenBSD or other sources,
13 // and are covered by the appropriate copyright disclaimers included herein.
15 // -------------------------------------------
17 //####BSDCOPYRIGHTEND####
18 //==========================================================================
19 //#####DESCRIPTIONBEGIN####
22 // Contributors: gthomas
28 //####DESCRIPTIONEND####
30 //==========================================================================
33 /* $OpenBSD: if_dl.h,v 1.2 1997/02/24 13:33:58 niklas Exp $ */
34 /* $NetBSD: if_dl.h,v 1.8 1995/03/26 20:30:13 jtc Exp $ */
37 * Copyright (c) 1990, 1993
38 * The Regents of the University of California. All rights reserved.
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
48 * 3. All advertising materials mentioning features or use of this software
49 * must display the following acknowledgement:
50 * This product includes software developed by the University of
51 * California, Berkeley and its contributors.
52 * 4. Neither the name of the University nor the names of its contributors
53 * may be used to endorse or promote products derived from this software
54 * without specific prior written permission.
56 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
58 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
59 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
60 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
61 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
62 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
64 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
65 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
68 * @(#)if_dl.h 8.1 (Berkeley) 6/10/93
75 * A Link-Level Sockaddr may specify the interface in one of two
76 * ways: either by means of a system-provided index number (computed
77 * anew and possibly differently on every reboot), or by a human-readable
78 * string such as "il0" (for managerial convenience).
80 * Census taking actions, such as something akin to SIOCGCONF would return
81 * both the index and the human name.
83 * High volume transactions (such as giving a link-level ``from'' address
84 * in a recvfrom or recvmsg call) may be likely only to provide the indexed
85 * form, (which requires fewer copy operations and less space).
87 * The form and interpretation of the link-level address is purely a matter
88 * of convention between the device driver and its consumers; however, it is
89 * expected that all drivers for an interface of a given if_type will agree.
93 * Structure of a Link-Level sockaddr:
96 u_char sdl_len; /* Total length of sockaddr */
97 u_char sdl_family; /* AF_DLI */
98 u_int16_t sdl_index; /* if != 0, system given index for interface */
99 u_char sdl_type; /* interface type */
100 u_char sdl_nlen; /* interface name length, no trailing 0 reqd. */
101 u_char sdl_alen; /* link level address length */
102 u_char sdl_slen; /* link layer selector length */
103 char sdl_data[12]; /* minimum work area, can be larger;
104 contains both if name and ll address */
107 #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
111 #include <sys/cdefs.h>
114 void link_addr __P((const char *, struct sockaddr_dl *));
115 char *link_ntoa __P((const struct sockaddr_dl *));
118 #endif /* !_KERNEL */
120 #endif // _NET_IF_DL_H_