1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 1983 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29#include <sys/types.h>
30#include <netinet/in.h>
31
32/*
33 * Return the local network address portion of an
34 * internet address; handles class a/b/c network
35 * number formats.
36 */
37int
38inet_lnaof(struct in_addr in)
39{
40	u_long i = ntohl(in.s_addr);
41
42	if (IN_CLASSA(i))
43		return ((i)&IN_CLASSA_HOST);
44	else if (IN_CLASSB(i))
45		return ((i)&IN_CLASSB_HOST);
46	else
47		return ((i)&IN_CLASSC_HOST);
48}
49