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/****************************************************************************
* net/arp/arp_ipin.c
*
* Copyright (C) 2007-2011, 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Based on uIP which also has a BSD style license:
*
* Author: Adam Dunkels <adam@dunkels.com>
* Copyright (c) 2001-2003, Adam Dunkels.
* All rights reserved.
*
* 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. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <netinet/in.h>
#include <nuttx/net/netdev.h>
#include <nuttx/net/arp.h>
#include "arp/arp.h"
#ifdef CONFIG_NET_ARP_IPIN
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define ETHBUF ((struct eth_hdr_s *)&dev->d_buf[0])
#define IPBUF ((struct arp_iphdr_s *)&dev->d_buf[ETH_HDRLEN])
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: arp_ipin
*
* Description:
* The arp_ipin() function should be called by Ethernet device drivers
* whenever an IP packet arrives from the network. The function will
* check if the address is in the ARP cache, and if so the ARP cache entry
* will be refreshed. If no ARP cache entry was found, a new one is created.
*
* This function expects that an IP packet with an Ethernet header is
* present in the d_buf buffer and that the length of the packet is in the
* d_len field.
*
****************************************************************************/
void arp_ipin(FAR struct net_driver_s *dev)
{
in_addr_t srcipaddr;
/* Only insert/update an entry if the source IP address of the incoming IP
* packet comes from a host on the local network.
*/
srcipaddr = net_ip4addr_conv32(IPBUF->eh_srcipaddr);
if (net_ipaddr_maskcmp(srcipaddr, dev->d_ipaddr, dev->d_netmask))
{
arp_update(IPBUF->eh_srcipaddr, ETHBUF->src);
}
}
#endif /* CONFIG_NET_ARP_IPIN */
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