Annotation of sys/net/if_dl.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: if_dl.h,v 1.6 2003/06/02 23:28:12 millert Exp $ */
2: /* $NetBSD: if_dl.h,v 1.8 1995/03/26 20:30:13 jtc Exp $ */
3:
4: /*
5: * Copyright (c) 1990, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. Neither the name of the University nor the names of its contributors
17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: *
32: * @(#)if_dl.h 8.1 (Berkeley) 6/10/93
33: */
34:
35: /*
36: * A Link-Level Sockaddr may specify the interface in one of two
37: * ways: either by means of a system-provided index number (computed
38: * anew and possibly differently on every reboot), or by a human-readable
39: * string such as "il0" (for managerial convenience).
40: *
41: * Census taking actions, such as something akin to SIOCGCONF would return
42: * both the index and the human name.
43: *
44: * High volume transactions (such as giving a link-level ``from'' address
45: * in a recvfrom or recvmsg call) may be likely only to provide the indexed
46: * form, (which requires fewer copy operations and less space).
47: *
48: * The form and interpretation of the link-level address is purely a matter
49: * of convention between the device driver and its consumers; however, it is
50: * expected that all drivers for an interface of a given if_type will agree.
51: */
52:
53: #ifndef _NET_IF_DL_H_
54: #define _NET_IF_DL_H_
55:
56: /*
57: * Structure of a Link-Level sockaddr:
58: */
59: struct sockaddr_dl {
60: u_char sdl_len; /* Total length of sockaddr */
61: u_char sdl_family; /* AF_LINK */
62: u_int16_t sdl_index; /* if != 0, system given index for interface */
63: u_char sdl_type; /* interface type */
64: u_char sdl_nlen; /* interface name length, no trailing 0 reqd. */
65: u_char sdl_alen; /* link level address length */
66: u_char sdl_slen; /* link layer selector length */
67: char sdl_data[12]; /* minimum work area, can be larger;
68: contains both if name and ll address */
69: };
70:
71: #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
72:
73: #ifndef _KERNEL
74:
75: #include <sys/cdefs.h>
76:
77: __BEGIN_DECLS
78: void link_addr(const char *, struct sockaddr_dl *);
79: char *link_ntoa(const struct sockaddr_dl *);
80: __END_DECLS
81:
82: #endif /* _KERNEL */
83: #endif /* _NET_IF_DL_H_ */
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