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- /****************************************************************************
- * net/utils/net_ipv6_maskcmp.c
- *
- * Copyright (C) 2015 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * 3. Neither the name NuttX nor the names of its contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <nuttx/net/ip.h>
- #include "utils/utils.h"
- #ifdef CONFIG_NET_IPv6
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: net_ipv6addr_maskcmp
- *
- * Description:
- * Compare two IPv6 addresses under a netmask. The mask is used to mask
- * out the bits that are to be compared: Buts within the mask much
- * match exactly; bits outside if the mask are ignored.
- *
- * Input Parameters:
- * addr1 - The first IP address.
- * addr2 - The second IP address.
- * mask - The netmask.
- *
- * Returned Value:
- * True if the address under the mask are equal
- *
- ****************************************************************************/
- bool net_ipv6addr_maskcmp(const net_ipv6addr_t addr1,
- const net_ipv6addr_t addr2,
- const net_ipv6addr_t mask)
- {
- int i;
- /* Start from the "bottom" where the addresses will most likely differ */
- for (i = 7; i >= 0; i--)
- {
- /* Same? */
- if ((addr1[i] & mask[i]) != (addr2[i] & mask[i]))
- {
- /* No.. the addresses are different */
- return false;
- }
- }
- /* The addresses are the same */
- return true;
- }
- #endif /* CONFIG_NET_IPv6 */
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