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 network number from an internet
42 * address; handles class a/b/c network #'s.
43 */
44in_addr_t
45inet_netof(struct in_addr in)
46{
47	in_addr_t i = ntohl(in.s_addr);
48
49	if (IN_CLASSA(i))
50		return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT);
51	else if (IN_CLASSB(i))
52		return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);
53	else
54		return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);
55}
56
57/*
58 * Weak aliases for applications that use certain private entry points,
59 * and fail to include <arpa/inet.h>.
60 */
61#undef inet_netof
62__weak_reference(__inet_netof, inet_netof);
63
64/*! \file */
65