workbench/network/common/include/net/if_dl.h

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