xref: /titanic_52/usr/src/lib/libsocket/inet/inet_mkaddr.c (revision cc7a88b54b4969574f03e1a1225bb13be487f5db)
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 2001 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
28 /*	  All Rights Reserved  	*/
29 
30 /*
31  * University Copyright- Copyright (c) 1982, 1986, 1988
32  * The Regents of the University of California
33  * All Rights Reserved
34  *
35  * University Acknowledgment- Portions of this document are derived from
36  * software developed by the University of California, Berkeley, and its
37  * contributors.
38  */
39 
40 #pragma ident	"%Z%%M%	%I%	%E% SMI"
41 
42 #include <sys/types.h>
43 #include <netinet/in.h>
44 
45 /*
46  * Formulate an Internet address from network + host.  Used in
47  * building addresses stored in the ifnet structure.
48  */
49 struct in_addr
50 inet_makeaddr(ipaddr_t net, ipaddr_t host)
51 {
52 	ipaddr_t addr;
53 	struct in_addr inaddr;
54 
55 	if (net < 128)
56 		addr = (net << IN_CLASSA_NSHIFT) | (host & IN_CLASSA_HOST);
57 	else if (net < 65536)
58 		addr = (net << IN_CLASSB_NSHIFT) | (host & IN_CLASSB_HOST);
59 	else if (net < 16777216L)
60 		addr = (net << IN_CLASSC_NSHIFT) | (host & IN_CLASSC_HOST);
61 	else
62 		addr = net | host;
63 	addr = htonl(addr);
64 	inaddr.s_addr = addr;
65 	return (inaddr);
66 }
67