include/net/if_dl.h

   1 /*
   2  * Copyright 1993-2003 Sun Microsystems, Inc.  All rights reserved.
   3  * Use is subject to license terms.
   4  */
   5 /*
   6  * Copyright (c) 1990, 1993
   7  *      The Regents of the University of California.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by the University of
  20  *      California, Berkeley and its contributors.
  21  * 4. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  */
  37
  38 #ifndef _NET_IF_DL_H
  39 #define _NET_IF_DL_H
  40
  41 /* from UCB 8.1 (Berkeley) 6/10/93 */
  42
  43 #ifdef  __cplusplus
  44 extern "C" {
  45 #endif
  46
  47 /*
  48  * A Link-Level Sockaddr may specify the interface in one of two
  49  * ways: either by means of a system-provided index number (computed
  50  * anew and possibly differently on every reboot), or by a human-readable
  51  * string such as "il0" (for managerial convenience).
  52  *
  53  * Census taking actions, such as something akin to SIOCGCONF would return
  54  * both the index and the human name.
  55  *
  56  * High volume transactions (such as giving a link-level ``from'' address
  57  * in a recvfrom or recvmsg call) may be likely only to provide the indexed
  58  * form, (which requires fewer copy operations and less space).
  59  *
  60  * The form and interpretation  of the link-level address is purely a matter
  61  * of convention between the device driver and its consumers; however, it is
  62  * expected that all drivers for an interface of a given if_type will agree.
  63  */
  64
  65 /*
  66  * Structure of a Link-Level sockaddr:
  67  */
  68 struct sockaddr_dl {
  69         ushort_t sdl_family;    /* AF_LINK */
  70         ushort_t sdl_index;     /* if != 0, system given index for interface */
  71         uchar_t sdl_type;       /* interface type */
  72         uchar_t sdl_nlen;       /* interface name length, no trailing 0 reqd. */
  73         uchar_t sdl_alen;       /* link level address length */
  74         uchar_t sdl_slen;       /* link layer selector length */
  75         char    sdl_data[244];  /* contains both if name and ll address */
  76 };
  77
  78 #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
  79
  80 #ifdef  __STDC__
  81 extern char *_link_ntoa(const unsigned char *, char *, int, int);
  82 extern unsigned char *_link_aton(const char *, int *);
  83 #else   /* __STDC__ */
  84 extern char *_link_ntoa();
  85 extern unsigned char *_link_aton();
  86 #endif  /* __STDC__ */
  87
  88 #ifdef  __cplusplus
  89 }
  90 #endif
  91
  92 #endif  /* _NET_IF_DL_H */