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23 * Copyright (c) 1990, 1993
24 * The Regents of the University of California. All rights reserved.
26 * Redistribution and use in source and binary forms, with or without
27 * modification, are permitted provided that the following conditions
29 * 1. Redistributions of source code must retain the above copyright
30 * notice, this list of conditions and the following disclaimer.
31 * 2. Redistributions in binary form must reproduce the above copyright
32 * notice, this list of conditions and the following disclaimer in the
33 * documentation and/or other materials provided with the distribution.
34 * 3. All advertising materials mentioning features or use of this software
35 * must display the following acknowledgement:
36 * This product includes software developed by the University of
37 * California, Berkeley and its contributors.
38 * 4. Neither the name of the University nor the names of its contributors
39 * may be used to endorse or promote products derived from this software
40 * without specific prior written permission.
42 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
43 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
44 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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46 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
47 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
48 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
49 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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54 * @(#)if_dl.h 8.1 (Berkeley) 6/10/93
55 * $FreeBSD: src/sys/net/if_dl.h,v 1.10 2000/03/01 02:46:25 archie Exp $
62 * A Link-Level Sockaddr may specify the interface in one of two
63 * ways: either by means of a system-provided index number (computed
64 * anew and possibly differently on every reboot), or by a human-readable
65 * string such as "il0" (for managerial convenience).
67 * Census taking actions, such as something akin to SIOCGCONF would return
68 * both the index and the human name.
70 * High volume transactions (such as giving a link-level ``from'' address
71 * in a recvfrom or recvmsg call) may be likely only to provide the indexed
72 * form, (which requires fewer copy operations and less space).
74 * The form and interpretation of the link-level address is purely a matter
75 * of convention between the device driver and its consumers; however, it is
76 * expected that all drivers for an interface of a given if_type will agree.
80 * Structure of a Link-Level sockaddr:
83 u_char sdl_len; /* Total length of sockaddr */
84 u_char sdl_family; /* AF_LINK */
85 u_short sdl_index; /* if != 0, system given index for interface */
86 u_char sdl_type; /* interface type */
87 u_char sdl_nlen; /* interface name length, no trailing 0 reqd. */
88 u_char sdl_alen; /* link level address length */
89 u_char sdl_slen; /* link layer selector length */
90 char sdl_data[12]; /* minimum work area, can be larger;
91 contains both if name and ll address */
92 u_short sdl_rcf; /* source routing control */
93 u_short sdl_route[16]; /* source routing information */
96 #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
101 void link_addr __P((const char *, struct sockaddr_dl *));
102 char *link_ntoa __P((const struct sockaddr_dl *));
105 #endif /* !_KERNEL */