1 /* 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. 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 8.1 (Berkeley) 6/10/93 34 * $FreeBSD: src/sys/net/if_dl.h,v 1.10 2000/03/01 02:46:25 archie Exp $ 35 * $DragonFly: src/sys/net/if_dl.h,v 1.4 2006/05/20 02:42:08 dillon Exp $ 36 */ 37 38 #ifndef _NET_IF_DL_H_ 39 #define _NET_IF_DL_H_ 40 41 #ifndef _SYS_TYPES_H_ 42 #include <sys/types.h> 43 #endif 44 45 /* 46 * A Link-Level Sockaddr may specify the interface in one of two 47 * ways: either by means of a system-provided index number (computed 48 * anew and possibly differently on every reboot), or by a human-readable 49 * string such as "il0" (for managerial convenience). 50 * 51 * Census taking actions, such as something akin to SIOCGCONF would return 52 * both the index and the human name. 53 * 54 * High volume transactions (such as giving a link-level ``from'' address 55 * in a recvfrom or recvmsg call) may be likely only to provide the indexed 56 * form, (which requires fewer copy operations and less space). 57 * 58 * The form and interpretation of the link-level address is purely a matter 59 * of convention between the device driver and its consumers; however, it is 60 * expected that all drivers for an interface of a given if_type will agree. 61 */ 62 63 /* 64 * Structure of a Link-Level sockaddr: 65 */ 66 struct sockaddr_dl { 67 u_char sdl_len; /* Total length of sockaddr */ 68 u_char sdl_family; /* AF_LINK */ 69 u_short sdl_index; /* if != 0, system given index for interface */ 70 u_char sdl_type; /* interface type */ 71 u_char sdl_nlen; /* interface name length, no trailing 0 reqd. */ 72 u_char sdl_alen; /* link level address length */ 73 u_char sdl_slen; /* link layer selector length */ 74 char sdl_data[12]; /* minimum work area, can be larger; 75 contains both if name and ll address */ 76 u_short sdl_rcf; /* source routing control */ 77 u_short sdl_route[16]; /* source routing information */ 78 }; 79 80 #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen)) 81 82 #ifndef _KERNEL 83 84 #include <sys/cdefs.h> 85 86 __BEGIN_DECLS 87 void link_addr (const char *, struct sockaddr_dl *); 88 char *link_ntoa (const struct sockaddr_dl *); 89 __END_DECLS 90 91 #endif /* !_KERNEL */ 92 93 #endif 94