/* $NetBSD: if_dl.h,v 1.8 1995/03/26 20:30:13 jtc Exp $ */ /* * Copyright (c) 1990, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)if_dl.h 8.1 (Berkeley) 6/10/93 */ /* * A Link-Level Sockaddr may specify the interface in one of two * ways: either by means of a system-provided index number (computed * anew and possibly differently on every reboot), or by a human-readable * string such as "il0" (for managerial convenience). * * Census taking actions, such as something akin to SIOCGCONF would return * both the index and the human name. * * High volume transactions (such as giving a link-level ``from'' address * in a recvfrom or recvmsg call) may be likely only to provide the indexed * form, (which requires fewer copy operations and less space). * * The form and interpretation of the link-level address is purely a matter * of convention between the device driver and its consumers; however, it is * expected that all drivers for an interface of a given if_type will agree. */ /* * Structure of a Link-Level sockaddr: */ struct sockaddr_dl { u_char sdl_len; /* Total length of sockaddr */ u_char sdl_family; /* AF_DLI */ u_int16_t sdl_index; /* if != 0, system given index for interface */ u_char sdl_type; /* interface type */ u_char sdl_nlen; /* interface name length, no trailing 0 reqd. */ u_char sdl_alen; /* link level address length */ u_char sdl_slen; /* link layer selector length */ char sdl_data[12]; /* minimum work area, can be larger; contains both if name and ll address */ }; #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen)) #ifndef _KERNEL #include <sys/cdefs.h> __BEGIN_DECLS void link_addr __P((const char *, struct sockaddr_dl *)); char *link_ntoa __P((const struct sockaddr_dl *)); __END_DECLS #endif /* !_KERNEL */