if_dl.h revision 96184
11541Srgrimes/* 21541Srgrimes * Copyright (c) 1990, 1993 31541Srgrimes * The Regents of the University of California. All rights reserved. 41541Srgrimes * 51541Srgrimes * Redistribution and use in source and binary forms, with or without 61541Srgrimes * modification, are permitted provided that the following conditions 71541Srgrimes * are met: 81541Srgrimes * 1. Redistributions of source code must retain the above copyright 91541Srgrimes * notice, this list of conditions and the following disclaimer. 101541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111541Srgrimes * notice, this list of conditions and the following disclaimer in the 121541Srgrimes * documentation and/or other materials provided with the distribution. 131541Srgrimes * 3. All advertising materials mentioning features or use of this software 141541Srgrimes * must display the following acknowledgement: 151541Srgrimes * This product includes software developed by the University of 161541Srgrimes * California, Berkeley and its contributors. 171541Srgrimes * 4. Neither the name of the University nor the names of its contributors 181541Srgrimes * may be used to endorse or promote products derived from this software 191541Srgrimes * without specific prior written permission. 201541Srgrimes * 211541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311541Srgrimes * SUCH DAMAGE. 321541Srgrimes * 331541Srgrimes * @(#)if_dl.h 8.1 (Berkeley) 6/10/93 3450477Speter * $FreeBSD: head/sys/net/if_dl.h 96184 2002-05-07 22:14:06Z kbyanc $ 351541Srgrimes */ 361541Srgrimes 372168Spaul#ifndef _NET_IF_DL_H_ 382168Spaul#define _NET_IF_DL_H_ 392168Spaul 408876Srgrimes/* 411541Srgrimes * A Link-Level Sockaddr may specify the interface in one of two 421541Srgrimes * ways: either by means of a system-provided index number (computed 431541Srgrimes * anew and possibly differently on every reboot), or by a human-readable 441541Srgrimes * string such as "il0" (for managerial convenience). 458876Srgrimes * 461541Srgrimes * Census taking actions, such as something akin to SIOCGCONF would return 471541Srgrimes * both the index and the human name. 488876Srgrimes * 491541Srgrimes * High volume transactions (such as giving a link-level ``from'' address 501541Srgrimes * in a recvfrom or recvmsg call) may be likely only to provide the indexed 511541Srgrimes * form, (which requires fewer copy operations and less space). 528876Srgrimes * 531541Srgrimes * The form and interpretation of the link-level address is purely a matter 541541Srgrimes * of convention between the device driver and its consumers; however, it is 551541Srgrimes * expected that all drivers for an interface of a given if_type will agree. 561541Srgrimes */ 571541Srgrimes 581541Srgrimes/* 591541Srgrimes * Structure of a Link-Level sockaddr: 601541Srgrimes */ 611541Srgrimesstruct sockaddr_dl { 621541Srgrimes u_char sdl_len; /* Total length of sockaddr */ 6357637Sarchie u_char sdl_family; /* AF_LINK */ 641541Srgrimes u_short sdl_index; /* if != 0, system given index for interface */ 651541Srgrimes u_char sdl_type; /* interface type */ 661541Srgrimes u_char sdl_nlen; /* interface name length, no trailing 0 reqd. */ 671541Srgrimes u_char sdl_alen; /* link level address length */ 681541Srgrimes u_char sdl_slen; /* link layer selector length */ 6996184Skbyanc char sdl_data[46]; /* minimum work area, can be larger; 701541Srgrimes contains both if name and ll address */ 711541Srgrimes}; 721541Srgrimes 731541Srgrimes#define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen)) 741541Srgrimes 7555205Speter#ifndef _KERNEL 761541Srgrimes 771541Srgrimes#include <sys/cdefs.h> 781541Srgrimes 791541Srgrimes__BEGIN_DECLS 8092725Salfredvoid link_addr(const char *, struct sockaddr_dl *); 8192725Salfredchar *link_ntoa(const struct sockaddr_dl *); 821541Srgrimes__END_DECLS 831541Srgrimes 8455205Speter#endif /* !_KERNEL */ 852168Spaul 862168Spaul#endif 87