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b688fc87 WJ |
1 | /* |
2 | * Copyright (c) 1990 Regents of the University of California. | |
3 | * 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 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | * | |
33 | * @(#)if_dl.h 7.2 (Berkeley) 2/22/91 | |
34 | */ | |
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_DLI */ | |
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[12]; /* 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 __P((const char *, struct sockaddr_dl *)); | |
77 | char *link_ntoa __P((const struct sockaddr_dl *)); | |
78 | __END_DECLS | |
79 | ||
80 | #endif /* !KERNEL */ |