bsd/net/if_dl.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1990, 1993
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  * 1. Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  * 2. Redistributions in binary form must reproduce the above copyright
  32  *    notice, this list of conditions and the following disclaimer in the
  33  *    documentation and/or other materials provided with the distribution.
  34  * 3. All advertising materials mentioning features or use of this software
  35  *    must display the following acknowledgement:
  36  *      This product includes software developed by the University of
  37  *      California, Berkeley and its contributors.
  38  * 4. Neither the name of the University nor the names of its contributors
  39  *    may be used to endorse or promote products derived from this software
  40  *    without specific prior written permission.
  41  *
  42  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  43  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  44  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  45  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  46  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  47  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  48  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  49  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  50  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  51  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  52  * SUCH DAMAGE.
  53  *
  54  *      @(#)if_dl.h     8.1 (Berkeley) 6/10/93
  55  */
  56
  57 #ifndef _NET_IF_DL_H_
  58 #define _NET_IF_DL_H_
  59
  60 /*
  61  * A Link-Level Sockaddr may specify the interface in one of two
  62  * ways: either by means of a system-provided index number (computed
  63  * anew and possibly differently on every reboot), or by a human-readable
  64  * string such as "il0" (for managerial convenience).
  65  *
  66  * Census taking actions, such as something akin to SIOCGCONF would return
  67  * both the index and the human name.
  68  *
  69  * High volume transactions (such as giving a link-level ``from'' address
  70  * in a recvfrom or recvmsg call) may be likely only to provide the indexed
  71  * form, (which requires fewer copy operations and less space).
  72  *
  73  * The form and interpretation  of the link-level address is purely a matter
  74  * of convention between the device driver and its consumers; however, it is
  75  * expected that all drivers for an interface of a given if_type will agree.
  76  */
  77
  78 /*
  79  * Structure of a Link-Level sockaddr:
  80  */
  81 struct sockaddr_dl {
  82         u_char  sdl_len;        /* Total length of sockaddr */
  83         u_char  sdl_family;     /* AF_DLI */
  84         u_short sdl_index;      /* if != 0, system given index for interface */
  85         u_char  sdl_type;       /* interface type */
  86         u_char  sdl_nlen;       /* interface name length, no trailing 0 reqd. */
  87         u_char  sdl_alen;       /* link level address length */
  88         u_char  sdl_slen;       /* link layer selector length */
  89         char    sdl_data[12];   /* minimum work area, can be larger;
  90                                    contains both if name and ll address */
  91 };
  92
  93 #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
  94
  95 #ifndef KERNEL
  96
  97 #include <sys/cdefs.h>
  98
  99 __BEGIN_DECLS
 100 void    link_addr __P((const char *, struct sockaddr_dl *));
 101 char    *link_ntoa __P((const struct sockaddr_dl *));
 102 __END_DECLS
 103
 104 #endif /* !KERNEL */
 105
 106 #endif