1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate  * CDDL HEADER START
3*0Sstevel@tonic-gate  *
4*0Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
7*0Sstevel@tonic-gate  * with the License.
8*0Sstevel@tonic-gate  *
9*0Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate  * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate  * and limitations under the License.
13*0Sstevel@tonic-gate  *
14*0Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate  *
20*0Sstevel@tonic-gate  * CDDL HEADER END
21*0Sstevel@tonic-gate  */
22*0Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
23*0Sstevel@tonic-gate 	  /* from UCB 4.3 82/11/14 */
24*0Sstevel@tonic-gate 
25*0Sstevel@tonic-gate #include <sys/types.h>
26*0Sstevel@tonic-gate #include <netinet/in.h>
27*0Sstevel@tonic-gate 
28*0Sstevel@tonic-gate /*
29*0Sstevel@tonic-gate  * Return the network number from an internet
30*0Sstevel@tonic-gate  * address; handles class a/b/c network #'s.
31*0Sstevel@tonic-gate  */
32*0Sstevel@tonic-gate inet_netof(in)
33*0Sstevel@tonic-gate 	struct in_addr in;
34*0Sstevel@tonic-gate {
35*0Sstevel@tonic-gate 	register u_long i = ntohl(in.s_addr);
36*0Sstevel@tonic-gate 
37*0Sstevel@tonic-gate 	if (IN_CLASSA(i))
38*0Sstevel@tonic-gate 		return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT);
39*0Sstevel@tonic-gate 	else if (IN_CLASSB(i))
40*0Sstevel@tonic-gate 		return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);
41*0Sstevel@tonic-gate 	else
42*0Sstevel@tonic-gate 		return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);
43*0Sstevel@tonic-gate }
44