1 /* $NetBSD: if_dl.h,v 1.23 2008/02/20 17:18:11 matt Exp $ */ 2 3 /* 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)if_dl.h 8.1 (Berkeley) 6/10/93 32 */ 33 34 /* 35 * A Link-Level Sockaddr may specify the interface in one of two 36 * ways: either by means of a system-provided index number (computed 37 * anew and possibly differently on every reboot), or by a human-readable 38 * string such as "il0" (for managerial convenience). 39 * 40 * Census taking actions, such as something akin to SIOCGCONF would return 41 * both the index and the human name. 42 * 43 * High volume transactions (such as giving a link-level ``from'' address 44 * in a recvfrom or recvmsg call) may be likely only to provide the indexed 45 * form, (which requires fewer copy operations and less space). 46 * 47 * The form and interpretation of the link-level address is purely a matter 48 * of convention between the device driver and its consumers; however, it is 49 * expected that all drivers for an interface of a given if_type will agree. 50 */ 51 52 #ifndef _NET_IF_DL_H_ 53 #define _NET_IF_DL_H_ 54 55 #include <sys/ansi.h> 56 57 #ifndef sa_family_t 58 typedef __sa_family_t sa_family_t; 59 #define sa_family_t __sa_family_t 60 #endif 61 62 /* 63 * Structure of a Link-Level sockaddr: 64 */ 65 struct sockaddr_dl { 66 uint8_t sdl_len; /* Total length of sockaddr */ 67 sa_family_t sdl_family; /* AF_LINK */ 68 uint16_t sdl_index; /* if != 0, system given index for interface */ 69 uint8_t sdl_type; /* interface type */ 70 uint8_t sdl_nlen; /* interface name length, no trailing 0 reqd. */ 71 uint8_t sdl_alen; /* link level address length */ 72 uint8_t sdl_slen; /* link layer selector length */ 73 /* minimum work area, can be larger; contains both if name 74 * and ll address 75 */ 76 char sdl_data[12]; 77 }; 78 79 #define satosdl(__sa) ((struct sockaddr_dl *)(__sa)) 80 #define satocsdl(__sa) ((const struct sockaddr_dl *)(__sa)) 81 82 /* We do arithmetic directly with these, so keep them char instead of void */ 83 #define LLADDR(s) ((char *)((s)->sdl_data + (s)->sdl_nlen)) 84 #define CLLADDR(s) ((const char *)((s)->sdl_data + (s)->sdl_nlen)) 85 86 #ifdef _KERNEL 87 uint8_t sockaddr_dl_measure(uint8_t, uint8_t); 88 struct sockaddr *sockaddr_dl_alloc(uint16_t, uint8_t, 89 const void *, uint8_t, const void *, uint8_t, int); 90 struct sockaddr_dl *sockaddr_dl_init(struct sockaddr_dl *, socklen_t, uint16_t, 91 uint8_t, const void *, uint8_t, const void *, uint8_t); 92 struct sockaddr_dl *sockaddr_dl_setaddr(struct sockaddr_dl *, socklen_t, 93 const void *, uint8_t); 94 #else 95 96 #include <sys/cdefs.h> 97 98 __BEGIN_DECLS 99 void link_addr(const char *, struct sockaddr_dl *); 100 char *link_ntoa(const struct sockaddr_dl *); 101 __END_DECLS 102 103 #endif /* !_KERNEL */ 104 105 #endif /* !_NET_IF_DL_H_ */ 106