133 lines
4.3 KiB
C
133 lines
4.3 KiB
C
/****************************************************************************
|
|
* net/neighbor/neighbor_add.c
|
|
*
|
|
* Copyright (C) 2007-2009, 2015, 2017 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* A leverage of logic from uIP which also has a BSD style license
|
|
*
|
|
* Copyright (c) 2006, Swedish Institute of Computer Science. All rights
|
|
* reserved.
|
|
* Author: Adam Dunkels <adam@sics.se>
|
|
*
|
|
* 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 of the Institute 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 INSTITUTE 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 INSTITUTE 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 <stdint.h>
|
|
#include <string.h>
|
|
#include <debug.h>
|
|
|
|
#include <net/if.h>
|
|
|
|
#include <nuttx/net/net.h>
|
|
#include <nuttx/net/ip.h>
|
|
|
|
#include "netdev/netdev.h"
|
|
#include "neighbor/neighbor.h"
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: neighbor_add
|
|
*
|
|
* Description:
|
|
* Add the new address association to the Neighbor Table (if it is not
|
|
* already there).
|
|
*
|
|
* Input Parameters:
|
|
* ipaddr - The IPv6 address of the mapping.
|
|
* lltype - The link layer address type
|
|
* addr - The link layer address of the mapping
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
****************************************************************************/
|
|
|
|
void neighbor_add(FAR net_ipv6addr_t ipaddr, uint8_t lltype,
|
|
FAR uint8_t *addr)
|
|
{
|
|
uint8_t oldest_time;
|
|
int oldest_ndx;
|
|
int i;
|
|
|
|
/* Find the first unused entry or the oldest used entry. */
|
|
|
|
oldest_time = 0;
|
|
oldest_ndx = 0;
|
|
|
|
for (i = 0; i < CONFIG_NET_IPv6_NCONF_ENTRIES; ++i)
|
|
{
|
|
if (g_neighbors[i].ne_time == NEIGHBOR_MAXTIME)
|
|
{
|
|
oldest_ndx = i;
|
|
break;
|
|
}
|
|
|
|
#ifdef CONFIG_NET_MULTILINK
|
|
if (g_neighbors[i].ne_addr.u.na_lltype == lltype &&
|
|
net_ipv6addr_cmp(g_neighbors[i].ne_ipaddr, ipaddr))
|
|
#else
|
|
if (net_ipv6addr_cmp(g_neighbors[i].ne_ipaddr, ipaddr))
|
|
#endif
|
|
{
|
|
oldest_ndx = i;
|
|
break;
|
|
}
|
|
|
|
if (g_neighbors[i].ne_time > oldest_time)
|
|
{
|
|
oldest_ndx = i;
|
|
oldest_time = g_neighbors[i].ne_time;
|
|
}
|
|
}
|
|
|
|
/* Use the oldest or first free entry (either pointed to by the
|
|
* "oldest_ndx" variable).
|
|
*/
|
|
|
|
g_neighbors[oldest_ndx].ne_time = 0;
|
|
net_ipv6addr_copy(g_neighbors[oldest_ndx].ne_ipaddr, ipaddr);
|
|
|
|
#ifdef CONFIG_NET_MULTILINK
|
|
g_neighbors[oldest_ndx].ne_addr.u.na_lltype = lltype;
|
|
#endif
|
|
memcpy(&g_neighbors[oldest_ndx].ne_addr.u, addr, netdev_type_lladdrsize(lltype));
|
|
|
|
/* Dump the contents of the new entry */
|
|
|
|
neighbor_dumpentry("Added entry", &g_neighbors[oldest_ndx]);
|
|
}
|