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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)if_dl.h 8.1 (Berkeley) 6/10/93 30 * $FreeBSD$ 31 */ 32 33 #ifndef _NET_IF_DL_H_ 34 #define _NET_IF_DL_H_ 35 36 /* 37 * A Link-Level Sockaddr may specify the interface in one of two 38 * ways: either by means of a system-provided index number (computed 39 * anew and possibly differently on every reboot), or by a human-readable 40 * string such as "il0" (for managerial convenience). 41 * 42 * Census taking actions, such as something akin to SIOCGCONF would return 43 * both the index and the human name. 44 * 45 * High volume transactions (such as giving a link-level ``from'' address 46 * in a recvfrom or recvmsg call) may be likely only to provide the indexed 47 * form, (which requires fewer copy operations and less space). 48 * 49 * The form and interpretation of the link-level address is purely a matter 50 * of convention between the device driver and its consumers; however, it is 51 * expected that all drivers for an interface of a given if_type will agree. 52 */ 53 54 /* 55 * Structure of a Link-Level sockaddr: 56 */ 57 struct sockaddr_dl { 58 u_char sdl_len; /* Total length of sockaddr */ 59 u_char sdl_family; /* AF_LINK */ 60 u_short sdl_index; /* if != 0, system given index for interface */ 61 u_char sdl_type; /* interface type */ 62 u_char sdl_nlen; /* interface name length, no trailing 0 reqd. */ 63 u_char sdl_alen; /* link level address length */ 64 u_char sdl_slen; /* link layer selector length */ 65 char sdl_data[46]; /* minimum work area, can be larger; 66 contains both if name and ll address */ 67 }; 68 69 #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen)) 70 #define LLINDEX(s) ((s)->sdl_index) 71 72 73 struct ifnet; 74 struct sockaddr_dl *link_alloc_sdl(size_t, int); 75 void link_free_sdl(struct sockaddr *sa); 76 struct sockaddr_dl *link_init_sdl(struct ifnet *, struct sockaddr *, u_char); 77 78 #ifndef _KERNEL 79 80 #include <sys/cdefs.h> 81 82 __BEGIN_DECLS 83 void link_addr(const char *, struct sockaddr_dl *); 84 char *link_ntoa(const struct sockaddr_dl *); 85 __END_DECLS 86 87 #endif /* !_KERNEL */ 88 89 #endif 90