104 lines
3.8 KiB
C
104 lines
3.8 KiB
C
/****************************************************************************
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* net/arp/arp_ipin.c
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (C) 2007-2011, 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Based on uIP which also has a BSD style license:
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*
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* Author: Adam Dunkels <adam@dunkels.com>
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* Copyright (c) 2001-2003, Adam Dunkels.
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* All rights reserved.
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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. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 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 <netinet/in.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/netdev.h>
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#include "arp/arp.h"
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#ifdef CONFIG_NET_ARP_IPIN
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: arp_ipin
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*
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* Description:
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* The arp_ipin() function should be called by Ethernet device drivers
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* whenever an IP packet arrives from the network. The function will
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* check if the address is in the ARP cache, and if so the ARP cache entry
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* will be refreshed. If no ARP cache entry was found, a new one is
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* created.
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*
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* This function expects that an IP packet with an Ethernet header is
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* present in the d_buf buffer and that the length of the packet is in the
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* d_len field.
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*
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****************************************************************************/
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void arp_ipin(FAR struct net_driver_s *dev)
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{
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in_addr_t srcipaddr;
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/* ARP support is only built if the Ethernet link layer is supported.
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* Continue and send the ARP request only if this device uses the
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* Ethernet link layer protocol.
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*/
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if (dev->d_lltype != NET_LL_ETHERNET &&
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dev->d_lltype != NET_LL_IEEE80211)
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{
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return;
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}
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/* Only insert/update an entry if the source IP address of the incoming IP
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* packet comes from a host on the local network.
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*/
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srcipaddr = net_ip4addr_conv32(ARPIPBUF->eh_srcipaddr);
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if (net_ipv4addr_maskcmp(srcipaddr, dev->d_ipaddr, dev->d_netmask))
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{
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arp_hdr_update(dev, ARPIPBUF->eh_srcipaddr, ETHBUF->src);
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}
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}
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#endif /* CONFIG_NET_ARP_IPIN */
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