17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate  * CDDL HEADER START
37c478bd9Sstevel@tonic-gate  *
47c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
57c478bd9Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
67c478bd9Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
77c478bd9Sstevel@tonic-gate  * with the License.
87c478bd9Sstevel@tonic-gate  *
97c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
107c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
117c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
127c478bd9Sstevel@tonic-gate  * and limitations under the License.
137c478bd9Sstevel@tonic-gate  *
147c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
157c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
167c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
177c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
187c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
197c478bd9Sstevel@tonic-gate  *
207c478bd9Sstevel@tonic-gate  * CDDL HEADER END
217c478bd9Sstevel@tonic-gate  */
227c478bd9Sstevel@tonic-gate /*
237c478bd9Sstevel@tonic-gate  * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
247c478bd9Sstevel@tonic-gate  * Use is subject to license terms.
257c478bd9Sstevel@tonic-gate  */
277c478bd9Sstevel@tonic-gate /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
28*8a7aa2a5SYuri Pankov /*	All Rights Reserved	*/
307c478bd9Sstevel@tonic-gate /*
317c478bd9Sstevel@tonic-gate  * University Copyright- Copyright (c) 1982, 1986, 1988
327c478bd9Sstevel@tonic-gate  * The Regents of the University of California
337c478bd9Sstevel@tonic-gate  * All Rights Reserved
347c478bd9Sstevel@tonic-gate  *
357c478bd9Sstevel@tonic-gate  * University Acknowledgment- Portions of this document are derived from
367c478bd9Sstevel@tonic-gate  * software developed by the University of California, Berkeley, and its
377c478bd9Sstevel@tonic-gate  * contributors.
387c478bd9Sstevel@tonic-gate  */
40*8a7aa2a5SYuri Pankov #include "lint.h"
427c478bd9Sstevel@tonic-gate #include <sys/types.h>
43*8a7aa2a5SYuri Pankov 
447c478bd9Sstevel@tonic-gate #include <netinet/in.h>
467c478bd9Sstevel@tonic-gate /*
477c478bd9Sstevel@tonic-gate  * Return the local network address portion of an
487c478bd9Sstevel@tonic-gate  * internet address; handles class a/b/c network
497c478bd9Sstevel@tonic-gate  * number formats.
507c478bd9Sstevel@tonic-gate  */
51*8a7aa2a5SYuri Pankov in_addr_t
inet_lnaof(struct in_addr in)527c478bd9Sstevel@tonic-gate inet_lnaof(struct in_addr in)
537c478bd9Sstevel@tonic-gate {
547c478bd9Sstevel@tonic-gate 	uint32_t i = ntohl(in.s_addr);
567c478bd9Sstevel@tonic-gate 	if (IN_CLASSA(i))
577c478bd9Sstevel@tonic-gate 		return ((i)&IN_CLASSA_HOST);
587c478bd9Sstevel@tonic-gate 	else if (IN_CLASSB(i))
597c478bd9Sstevel@tonic-gate 		return ((i)&IN_CLASSB_HOST);
607c478bd9Sstevel@tonic-gate 	else
617c478bd9Sstevel@tonic-gate 		return ((i)&IN_CLASSC_HOST);
627c478bd9Sstevel@tonic-gate }