dbbabcd33c
net/netlink/netlink_route.c: Add Netlink socket NETLINK_ROUTE support for getting a snopshot of the Neighbor table.
net/neighbor/neighbor_snapshot.c: Add neighbor_snapshot() that will eventually be used by the Netlink sockets. Also fixed naming violation 'struct neighbor_entry' -> 'struct neighbor_entry_s'.
include/nuttx/net/neighbor.h: Expose format of the IPv6 neighbor table for use with Netlink sockets.
107 lines
3.8 KiB
C
107 lines
3.8 KiB
C
/****************************************************************************
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* net/neighbor/neighbor_snapshot.c
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*
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* Copyright (C) 2019 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 the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be 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 INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* 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 <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 arp_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, 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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