59 lines
920 B
C
59 lines
920 B
C
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/*++
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Copyright (c) 1994 Microsoft Corporation
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Module Name:
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network.c
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Abstract:
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This module contains network specific utility routines used by the
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DHCP components.
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Author:
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Manny Weiser (mannyw) 12-Aug-1992
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Revision History:
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--*/
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#include "dhcpl.h"
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DHCP_IP_ADDRESS
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DhcpDefaultSubnetMask(
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DHCP_IP_ADDRESS IpAddress
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)
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/*++
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Routine Description:
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This function calculates the default subnet mask for a given IP
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address.
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Arguments:
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IpAddress - The address for which a subnet mask is needed.
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Return Value:
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The default subnet mask.
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-1, if the supplied IP address is invalid.
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--*/
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{
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if ( IN_CLASSA( IpAddress ) ) {
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return( IN_CLASSA_NET );
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} else if ( IN_CLASSB( IpAddress ) ) {
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return( IN_CLASSB_NET );
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} else if ( IN_CLASSC( IpAddress ) ) {
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return( IN_CLASSC_NET );
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} else {
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return( (DHCP_IP_ADDRESS)-1 );
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}
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}
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