bsd/net/if_dl.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Copyright (c) 1990, 1993
  30  *      The Regents of the University of California.  All rights reserved.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  *      @(#)if_dl.h     8.1 (Berkeley) 6/10/93
  61  * $FreeBSD: src/sys/net/if_dl.h,v 1.10 2000/03/01 02:46:25 archie Exp $
  62  */
  63
  64 #ifndef _NET_IF_DL_H_
  65 #define _NET_IF_DL_H_
  66 #include <sys/appleapiopts.h>
  67
  68 /*
  69  * A Link-Level Sockaddr may specify the interface in one of two
  70  * ways: either by means of a system-provided index number (computed
  71  * anew and possibly differently on every reboot), or by a human-readable
  72  * string such as "il0" (for managerial convenience).
  73  *
  74  * Census taking actions, such as something akin to SIOCGCONF would return
  75  * both the index and the human name.
  76  *
  77  * High volume transactions (such as giving a link-level ``from'' address
  78  * in a recvfrom or recvmsg call) may be likely only to provide the indexed
  79  * form, (which requires fewer copy operations and less space).
  80  *
  81  * The form and interpretation  of the link-level address is purely a matter
  82  * of convention between the device driver and its consumers; however, it is
  83  * expected that all drivers for an interface of a given if_type will agree.
  84  */
  85
  86 /*
  87  * Structure of a Link-Level sockaddr:
  88  */
  89 struct sockaddr_dl {
  90         u_char  sdl_len;        /* Total length of sockaddr */
  91         u_char  sdl_family;     /* AF_LINK */
  92         u_short sdl_index;      /* if != 0, system given index for interface */
  93         u_char  sdl_type;       /* interface type */
  94         u_char  sdl_nlen;       /* interface name length, no trailing 0 reqd. */
  95         u_char  sdl_alen;       /* link level address length */
  96         u_char  sdl_slen;       /* link layer selector length */
  97         char    sdl_data[12];   /* minimum work area, can be larger;
  98                                    contains both if name and ll address */
  99 #ifndef __APPLE__
 100         /* For TokenRing */
 101         u_short sdl_rcf;        /* source routing control */
 102         u_short sdl_route[16];  /* source routing information */
 103 #endif
 104 };
 105
 106 #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
 107 #ifdef KERNEL_PRIVATE
 108 #define CONST_LLADDR(s) ((const u_char*)((s)->sdl_data + (s)->sdl_nlen))
 109 #endif
 110
 111 #ifdef BSD_KERNEL_PRIVATE
 112 #define SDL(s) ((struct sockaddr_dl *)s)
 113 #endif
 114
 115 #ifndef KERNEL
 116
 117 #include <sys/cdefs.h>
 118
 119 __BEGIN_DECLS
 120 void    link_addr(const char *, struct sockaddr_dl *);
 121 char    *link_ntoa(const struct sockaddr_dl *);
 122 __END_DECLS
 123
 124 #endif /* !KERNEL */
 125
 126 #endif