bsd/net/if_dl.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1990, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  *
  57  *      @(#)if_dl.h     8.1 (Berkeley) 6/10/93
  58  * $FreeBSD: src/sys/net/if_dl.h,v 1.10 2000/03/01 02:46:25 archie Exp $
  59  */
  60
  61 #ifndef _NET_IF_DL_H_
  62 #define _NET_IF_DL_H_
  63 #include <sys/appleapiopts.h>
  64
  65 /*
  66  * A Link-Level Sockaddr may specify the interface in one of two
  67  * ways: either by means of a system-provided index number (computed
  68  * anew and possibly differently on every reboot), or by a human-readable
  69  * string such as "il0" (for managerial convenience).
  70  *
  71  * Census taking actions, such as something akin to SIOCGCONF would return
  72  * both the index and the human name.
  73  *
  74  * High volume transactions (such as giving a link-level ``from'' address
  75  * in a recvfrom or recvmsg call) may be likely only to provide the indexed
  76  * form, (which requires fewer copy operations and less space).
  77  *
  78  * The form and interpretation  of the link-level address is purely a matter
  79  * of convention between the device driver and its consumers; however, it is
  80  * expected that all drivers for an interface of a given if_type will agree.
  81  */
  82
  83 /*
  84  * Structure of a Link-Level sockaddr:
  85  */
  86 struct sockaddr_dl {
  87         u_char  sdl_len;        /* Total length of sockaddr */
  88         u_char  sdl_family;     /* AF_LINK */
  89         u_short sdl_index;      /* if != 0, system given index for interface */
  90         u_char  sdl_type;       /* interface type */
  91         u_char  sdl_nlen;       /* interface name length, no trailing 0 reqd. */
  92         u_char  sdl_alen;       /* link level address length */
  93         u_char  sdl_slen;       /* link layer selector length */
  94         char    sdl_data[12];   /* minimum work area, can be larger;
  95                                    contains both if name and ll address */
  96 #ifndef __APPLE__
  97         /* For TokenRing */
  98         u_short sdl_rcf;        /* source routing control */
  99         u_short sdl_route[16];  /* source routing information */
 100 #endif
 101 };
 102
 103 #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
 104
 105 #ifndef KERNEL
 106
 107 #include <sys/cdefs.h>
 108
 109 __BEGIN_DECLS
 110 void    link_addr __P((const char *, struct sockaddr_dl *));
 111 char    *link_ntoa __P((const struct sockaddr_dl *));
 112 __END_DECLS
 113
 114 #endif /* !KERNEL */
 115
 116 #endif