/*
 * @DEC_COPYRIGHT@
 */
/*
 * HISTORY
 * $Log: if_dl.h,v $
 * Revision 4.2.11.1  2000/09/25  22:40:44  Brian_Haley
 * 	Changed AF_DLI comment to AF_LINK.
 *
 * Revision 4.2.9.3  1999/02/09  19:03:30  Ken_Block
 * 	Make header C++ compliant.
 * 	[1998/12/29  20:18:28  Ken_Block]
 *
 * Revision 4.2.9.2  1996/12/09  22:01:22  Neil_Lewis
 * 	Add a prototype for a reentrant form of a function. (link_ntoa_r)
 * 	[1996/11/19  18:49:53  Neil_Lewis]
 * 
 * Revision 4.2.6.3  1993/10/07  21:58:33  Geraldine_Harter
 * 	Merge with Sterling BL6:
 * 
 * 	Revision 4.2.7.2  1993/06/29  17:30:50  SJ_Lee
 * 	add #ifndef
 * 	[1993/06/29  17:04:17  SJ_Lee]
 * 
 * Revision 4.2.6.2  1993/06/25  21:16:25  Geraldine_Harter
 * 	Merge OSF1.2 changes.
 * 	[1993/06/25  20:26:04  Geraldine_Harter]
 * 
 * Revision 4.2.3.2  1992/04/06  14:19:12  Geraldine_Harter
 * 	Increased the size of sdl_data[] from 12 to 16, since this work area is
 * 	allowed to be larger.  This is needed to pad out the structure size to be
 * 	evenly divisible by the machine pointer size.  This ensures that multiple
 * 	sockaddr_dl structures passed back to the user in response to a
 * 	(O)SIOCGIFCONF ioctl request  will always be aligned on a machine-pointer
 * 	boundary (eg. 8 bytes for Alpha).
 * 	[92/04/06  14:17:20  Geraldine_Harter]
 * 
 * Revision 4.2  91/09/19  22:44:57  devbld
 * 	Adding ODE Headers
 * 
 * $EndLog$
 */
/*	
 *	@(#)$RCSfile: if_dl.h,v $ $Revision: 4.2.11.1 $ (DEC) $Date: 2000/09/25 22:40:44 $
 */ 
/*
 */
/*
 * (c) Copyright 1990, OPEN SOFTWARE FOUNDATION, INC.
 * ALL RIGHTS RESERVED
 */
/*
 * OSF/1 Release 1.0
 */
/*
 * Copyright (c) 1990 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted provided
 * that: (1) source distributions retain this entire copyright notice and
 * comment, and (2) distributions including binaries display the following
 * acknowledgement:  ``This product includes software developed by the
 * University of California, Berkeley and its contributors'' in the
 * documentation or other materials provided with the distribution and in
 * all advertising materials mentioning features or use of this software.
 * Neither the name of the University nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *	Base:	if_dl.h	7.1 (Berkeley) 7/1/90
 */

/* 
 * A Link-Level Sockaddr may specify the interface in one of two
 * ways: either by means of a system-provided index number (computed
 * anew and possibly differently on every reboot), or by a human-readable
 * string such as "il0" (for managerial convenience).
 * 
 * Census taking actions, such as something akin to SIOCGCONF would return
 * both the index and the human name.
 * 
 * High volume transactions (such as giving a link-level ``from'' address
 * in a recvfrom or recvmsg call) may be likely only to provide the indexed
 * form, (which requires fewer copy operations and less space).
 * 
 * The form and interpretation  of the link-level address is purely a matter
 * of convention between the device driver and its consumers; however, it is
 * expected that all drivers for an interface of a given if_type will agree.
 */

#ifndef _IF_DL_H_
#define _IF_DL_H_

#ifdef __cplusplus
extern "C" {
#endif

/*
 * Structure of a Link-Level sockaddr:
 */
struct sockaddr_dl {
	u_char	sdl_len;	/* Total length of sockaddr */
	u_char	sdl_family;	/* AF_LINK */
	u_short	sdl_index;	/* if != 0, system given index for interface */
	u_char	sdl_type;	/* interface type */
	u_char	sdl_nlen;	/* interface name length, no trailing 0 reqd. */
	u_char	sdl_alen;	/* link level address length */
	u_char	sdl_slen;	/* link layer selector length */
	char	sdl_data[16];	/* minimum work area, can be larger;
				   contains both if name and ll address */

};

#define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))

#ifndef	_KERNEL
#ifdef	_NO_PROTO
extern void	link_addr();
extern char *	link_ntoa();
#if defined(_REENTRANT) || defined(_THREAD_SAFE)
extern int link_ntoa_r();
#endif  /* _REENTRANT || _THREAD_SAFE */
#else
extern void	link_addr(const char *, struct sockaddr_dl *);
extern char *	link_ntoa(const struct sockaddr_dl *);
#if defined(_REENTRANT) || defined(_THREAD_SAFE)
extern int link_ntoa_r(const struct sockaddr_dl *, char *, int);
#endif  /* _REENTRANT || _THREAD_SAFE */
#endif
#endif

#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* _IF_DL_H_ */