1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1983, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include "port_before.h"
33
34 #include <sys/param.h>
35 #include <netinet/in.h>
36 #include <arpa/inet.h>
37
38 #include "port_after.h"
39
40 /*%
41 * Return the local network address portion of an
42 * internet address; handles class a/b/c network
43 * number formats.
44 */
45 in_addr_t
inet_lnaof(struct in_addr in)46 inet_lnaof(struct in_addr in)
47 {
48 in_addr_t i = ntohl(in.s_addr);
49
50 if (IN_CLASSA(i))
51 return ((i)&IN_CLASSA_HOST);
52 else if (IN_CLASSB(i))
53 return ((i)&IN_CLASSB_HOST);
54 else
55 return ((i)&IN_CLASSC_HOST);
56 }
57
58 /*
59 * Weak aliases for applications that use certain private entry points,
60 * and fail to include <arpa/inet.h>.
61 */
62 #undef inet_lnaof
63 __weak_reference(__inet_lnaof, inet_lnaof);
64
65 /*! \file */
66