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/*

 * Copyright (c) 1990, 1993

 *      The Regents of the University of California.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *      This product includes software developed by the University of

 *      California, Berkeley and its contributors.

 * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 *      @(#)if_dl.h     8.1 (Berkeley) 6/10/93

 * $FreeBSD: src/sys/net/if_dl.h,v 1.12 2002/05/07 22:14:06 kbyanc Exp $

 */

#ifndef _NET_IF_DL_H_

#define _NET_IF_DL_H_

/*

 * 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.

 */

/*

 * 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[46];   /* 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

#include <sys/cdefs.h>

__BEGIN_DECLS

void    link_addr(const char *, struct sockaddr_dl *);

char    *link_ntoa(const struct sockaddr_dl *);

__END_DECLS

#endif /* !_KERNEL */

#endif