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2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
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15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
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33 * @(#)if_dl.h 8.1 (Berkeley) 6/10/93
34 * $Id: if_dl.h,v 1.1.1.1 2006/05/30 06:12:42 hhzhou Exp $
41 * A Link-Level Sockaddr may specify the interface in one of two
42 * ways: either by means of a system-provided index number (computed
43 * anew and possibly differently on every reboot), or by a human-readable
44 * string such as "il0" (for managerial convenience).
46 * Census taking actions, such as something akin to SIOCGCONF would return
47 * both the index and the human name.
49 * High volume transactions (such as giving a link-level ``from'' address
50 * in a recvfrom or recvmsg call) may be likely only to provide the indexed
51 * form, (which requires fewer copy operations and less space).
53 * The form and interpretation of the link-level address is purely a matter
54 * of convention between the device driver and its consumers; however, it is
55 * expected that all drivers for an interface of a given if_type will agree.
59 * Structure of a Link-Level sockaddr:
62 u_char sdl_len
; /* Total length of sockaddr */
63 u_char sdl_family
; /* AF_DLI */
64 u_short sdl_index
; /* if != 0, system given index for interface */
65 u_char sdl_type
; /* interface type */
66 u_char sdl_nlen
; /* interface name length, no trailing 0 reqd. */
67 u_char sdl_alen
; /* link level address length */
68 u_char sdl_slen
; /* link layer selector length */
69 char sdl_data
[12]; /* minimum work area, can be larger;
70 contains both if name and ll address */
73 #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
77 #include <sys/EfiCdefs.h>
80 void link_addr (const char *, struct sockaddr_dl
*);
81 char *link_ntoa (const struct sockaddr_dl
*);