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 #pragma ident "%Z%%M% %I% %E% SMI" 23 /* from UCB 4.3 82/11/14 */ 24 25 #include <sys/types.h> 26 #include <netinet/in.h> 27 28 /* 29 * Return the network number from an internet 30 * address; handles class a/b/c network #'s. 31 */ 32 inet_netof(in) 33 struct in_addr in; 34 { 35 register u_long i = ntohl(in.s_addr); 36 37 if (IN_CLASSA(i)) 38 return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT); 39 else if (IN_CLASSB(i)) 40 return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT); 41 else 42 return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT); 43 } 44