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      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 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     42 /* from UCB 8.1 (Berkeley) 6/10/93 */
     43 
     44 #ifdef	__cplusplus
     45 extern "C" {
     46 #endif
     47 
     48 /*
     49  * A Link-Level Sockaddr may specify the interface in one of two
     50  * ways: either by means of a system-provided index number (computed
     51  * anew and possibly differently on every reboot), or by a human-readable
     52  * string such as "il0" (for managerial convenience).
     53  *
     54  * Census taking actions, such as something akin to SIOCGCONF would return
     55  * both the index and the human name.
     56  *
     57  * High volume transactions (such as giving a link-level ``from'' address
     58  * in a recvfrom or recvmsg call) may be likely only to provide the indexed
     59  * form, (which requires fewer copy operations and less space).
     60  *
     61  * The form and interpretation  of the link-level address is purely a matter
     62  * of convention between the device driver and its consumers; however, it is
     63  * expected that all drivers for an interface of a given if_type will agree.
     64  */
     65 
     66 /*
     67  * Structure of a Link-Level sockaddr:
     68  */
     69 struct sockaddr_dl {
     70 	ushort_t sdl_family;	/* AF_LINK */
     71 	ushort_t sdl_index;	/* if != 0, system given index for interface */
     72 	uchar_t	sdl_type;	/* interface type */
     73 	uchar_t	sdl_nlen;	/* interface name length, no trailing 0 reqd. */
     74 	uchar_t	sdl_alen;	/* link level address length */
     75 	uchar_t	sdl_slen;	/* link layer selector length */
     76 	char	sdl_data[244];	/* contains both if name and ll address */
     77 };
     78 
     79 #define	LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
     80 
     81 #ifdef	__STDC__
     82 extern char *_link_ntoa(const unsigned char *, char *, int, int);
     83 extern unsigned char *_link_aton(const char *, int *);
     84 #else	/* __STDC__ */
     85 extern char *_link_ntoa();
     86 extern unsigned char *_link_aton();
     87 #endif	/* __STDC__ */
     88 
     89 #ifdef	__cplusplus
     90 }
     91 #endif
     92 
     93 #endif	/* _NET_IF_DL_H */
     94