97 lines
3.3 KiB
C
97 lines
3.3 KiB
C
/****************************************************************************
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* net/utils/net_ipv6_maskcmp.c
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* 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 COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/net/ip.h>
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#include "utils/utils.h"
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#ifdef CONFIG_NET_IPv6
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: net_ipv6addr_maskcmp
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*
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* Description:
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* Compare two IPv6 addresses under a netmask. The mask is used to mask
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* out the bits that are to be compared: Buts within the mask much
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* match exactly; bits outside if the mask are ignored.
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*
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* Parameters:
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* addr1 - The first IP address.
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* addr2 - The second IP address.
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* mask - The netmask.
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*
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* Returned Value:
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* True if the address under the mask are equal
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*
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****************************************************************************/
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bool net_ipv6addr_maskcmp(const net_ipv6addr_t addr1,
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const net_ipv6addr_t addr2,
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const net_ipv6addr_t mask)
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{
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int i;
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/* Start from the "bottom" where the addresses will most likely differ */
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for (i = 7; i >= 0; i--)
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{
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/* Same? */
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if ((addr1[i] & mask[i]) != (addr2[i] & mask[i]))
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{
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/* No.. the addresses are different */
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return false;
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}
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}
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/* The addresses are the same */
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return true;
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}
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#endif /* CONFIG_NET_IPv6 */
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