2 * Link-level sockaddr_dl definition.
5 /* $NetBSD: if_dl.h,v 1.8 1995/03/26 20:30:13 jtc Exp $ */
8 * Copyright (c) 1990, 1993
9 * The Regents of the University of California. All rights reserved.
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21 * This product includes software developed by the University of
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39 * @(#)if_dl.h 8.1 (Berkeley) 6/10/93
44 #ifndef __SYS_W32API_H
45 #include <sys/w32api.h>
49 #include <sys/cdefs.h>
53 * A Link-Level Sockaddr may specify the interface in one of two
54 * ways: either by means of a system-provided index number (computed
55 * anew and possibly differently on every reboot), or by a human-readable
56 * string such as "il0" (for managerial convenience).
58 * Census taking actions, such as something akin to SIOCGCONF would return
59 * both the index and the human name.
61 * High volume transactions (such as giving a link-level ``from'' address
62 * in a recvfrom or recvmsg call) may be likely only to provide the indexed
63 * form, (which requires fewer copy operations and less space).
65 * The form and interpretation of the link-level address is purely a matter
66 * of convention between the device driver and its consumers; however, it is
67 * expected that all drivers for an interface of a given if_type will agree.
71 * Structure of a Link-Level sockaddr:
74 u_char sdl_len; /* Total length of sockaddr */
75 u_char sdl_family; /* AF_DLI */
76 u_int16_t sdl_index; /* if != 0, system given index for interface */
77 u_char sdl_type; /* interface type */
78 u_char sdl_nlen; /* interface name length, no trailing 0 reqd. */
79 u_char sdl_alen; /* link level address length */
80 u_char sdl_slen; /* link layer selector length */
81 char sdl_data[12]; /* minimum work area, can be larger;
82 contains both if name and ll address */
85 #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
90 W32_FUNC void link_addr (const char *, struct sockaddr_dl *);
91 W32_FUNC char *link_ntoa (const struct sockaddr_dl *);