94 lines
3.1 KiB
C
94 lines
3.1 KiB
C
/****************************************************************************
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* net/neighbor/neighbor_snapshot.c
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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 <string.h>
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#include <debug.h>
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#include <nuttx/net/ip.h>
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#include "inet/inet.h"
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#include "neighbor/neighbor.h"
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#ifdef CONFIG_NETLINK_ROUTE
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: neighbor_snapshot
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*
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* Description:
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* Take a snapshot of the current state of the Neighbor table.
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*
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* Input Parameters:
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* snapshot - Location to return the Neighbor table copy
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* nentries - The size of the user provided 'dest' in entries, each of
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* size sizeof(struct neighbor_entry_s)
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*
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* Returned Value:
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* On success, the number of entries actually copied is returned. Unused
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* entries are not returned.
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*
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* Assumptions
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* The network is locked to assure exclusive access to the ARP table
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*
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****************************************************************************/
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unsigned int neighbor_snapshot(FAR struct neighbor_entry_s *snapshot,
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unsigned int nentries)
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{
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unsigned int ncopied;
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int i;
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/* Copy all non-empty entries in the Neighbor table. */
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for (i = 0, ncopied = 0;
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nentries > ncopied && i < CONFIG_NET_IPv6_NCONF_ENTRIES;
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i++)
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{
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FAR struct neighbor_entry_s *neighbor = &g_neighbors[i];
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/* An unused entry table entry will be nullified. In particularly,
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* the Neighbor IP address will be all zero (i.e., the unspecified
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* IPv6 address).
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*/
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if (!net_ipv6addr_cmp(neighbor->ne_ipaddr, g_ipv6_unspecaddr))
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{
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memcpy(&snapshot[ncopied], neighbor,
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sizeof(struct neighbor_entry_s));
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ncopied++;
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}
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}
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/* Return the number of entries copied into the user buffer */
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return ncopied;
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}
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#endif /* CONFIG_NETLINK_ROUTE */
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