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if_dl.h revision 1.11 
      1 /*	$NetBSD: if_dl.h,v 1.11 2000/07/28 12:13:32 kleink Exp $	*/
      2 
      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 #ifndef _NET_IF_DL_H_
     57 #define _NET_IF_DL_H_
     58 
     59 #include <sys/ansi.h>
     60 
     61 #ifndef sa_family_t
     62 typedef __sa_family_t	sa_family_t;
     63 #define sa_family_t	__sa_family_t
     64 #endif
     65 
     66 /*
     67  * Structure of a Link-Level sockaddr:
     68  */
     69 struct sockaddr_dl {
     70 	u_char	    sdl_len;	/* Total length of sockaddr */
     71 	sa_family_t sdl_family;	/* AF_DLI */
     72 	u_int16_t   sdl_index;	/* if != 0, system given index for interface */
     73 	u_char	    sdl_type;	/* interface type */
     74 	u_char	    sdl_nlen;	/* interface name length, no trailing 0 reqd. */
     75 	u_char	    sdl_alen;	/* link level address length */
     76 	u_char	    sdl_slen;	/* link layer selector length */
     77 	char	    sdl_data[12]; /* minimum work area, can be larger;
     78 				     contains both if name and ll address */
     79 };
     80 
     81 #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
     82 
     83 #ifndef _KERNEL
     84 
     85 #include <sys/cdefs.h>
     86 
     87 __BEGIN_DECLS
     88 void	link_addr __P((const char *, struct sockaddr_dl *));
     89 char	*link_ntoa __P((const struct sockaddr_dl *));
     90 __END_DECLS
     91 
     92 #endif /* !_KERNEL */
     93 
     94 #endif /* _NET_IF_DL_H_ */
     95