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/* $OpenBSD: inet_makeaddr.c,v 1.7 2015/01/16 16:48:51 deraadt Exp $ */ |
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/* |
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* Copyright (c) 1983, 1993 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include <netinet/in.h> |
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#include <arpa/inet.h> |
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/* |
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* Formulate an Internet address from network + host. Used in |
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* building addresses stored in the ifnet structure. |
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*/ |
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struct in_addr |
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inet_makeaddr(in_addr_t net, in_addr_t host) |
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{ |
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in_addr_t addr; |
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if (net < 128) |
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addr = (net << IN_CLASSA_NSHIFT) | (host & IN_CLASSA_HOST); |
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else if (net < 65536) |
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addr = (net << IN_CLASSB_NSHIFT) | (host & IN_CLASSB_HOST); |
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else if (net < 16777216L) |
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addr = (net << IN_CLASSC_NSHIFT) | (host & IN_CLASSC_HOST); |
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else |
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addr = net | host; |
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addr = htonl(addr); |
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return (*(struct in_addr *)&addr); |
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} |