sys/net/if_dl.h

   1 /*
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)if_dl.h     8.1 (Berkeley) 6/10/93
  34  * $FreeBSD: src/sys/net/if_dl.h,v 1.10 2000/03/01 02:46:25 archie Exp $
  35  * $DragonFly: src/sys/net/if_dl.h,v 1.4 2006/05/20 02:42:08 dillon Exp $
  36  */
  37
  38 #ifndef _NET_IF_DL_H_
  39 #define _NET_IF_DL_H_
  40
  41 #ifndef _SYS_TYPES_H_
  42 #include <sys/types.h>
  43 #endif
  44
  45 /*
  46  * A Link-Level Sockaddr may specify the interface in one of two
  47  * ways: either by means of a system-provided index number (computed
  48  * anew and possibly differently on every reboot), or by a human-readable
  49  * string such as "il0" (for managerial convenience).
  50  *
  51  * Census taking actions, such as something akin to SIOCGCONF would return
  52  * both the index and the human name.
  53  *
  54  * High volume transactions (such as giving a link-level ``from'' address
  55  * in a recvfrom or recvmsg call) may be likely only to provide the indexed
  56  * form, (which requires fewer copy operations and less space).
  57  *
  58  * The form and interpretation  of the link-level address is purely a matter
  59  * of convention between the device driver and its consumers; however, it is
  60  * expected that all drivers for an interface of a given if_type will agree.
  61  */
  62
  63 /*
  64  * Structure of a Link-Level sockaddr:
  65  */
  66 struct sockaddr_dl {
  67         u_char  sdl_len;        /* Total length of sockaddr */
  68         u_char  sdl_family;     /* AF_LINK */
  69         u_short sdl_index;      /* if != 0, system given index for interface */
  70         u_char  sdl_type;       /* interface type */
  71         u_char  sdl_nlen;       /* interface name length, no trailing 0 reqd. */
  72         u_char  sdl_alen;       /* link level address length */
  73         u_char  sdl_slen;       /* link layer selector length */
  74         char    sdl_data[12];   /* minimum work area, can be larger;
  75                                    contains both if name and ll address */
  76         u_short sdl_rcf;        /* source routing control */
  77         u_short sdl_route[16];  /* source routing information */
  78 };
  79
  80 #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
  81
  82 #ifndef _KERNEL
  83
  84 #include <sys/cdefs.h>
  85
  86 __BEGIN_DECLS
  87 void    link_addr (const char *, struct sockaddr_dl *);
  88 char    *link_ntoa (const struct sockaddr_dl *);
  89 __END_DECLS
  90
  91 #endif /* !_KERNEL */
  92
  93 #endif