81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
/****************************************************************************
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* net/utils/net_ipv6_maskcmp.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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#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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* Input 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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