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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])
- /****************************************************************************
- * 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_ipv4addr_maskcmp(srcipaddr, dev->d_ipaddr, dev->d_netmask))
- {
- arp_hdr_update(IPBUF->eh_srcipaddr, ETHBUF->src);
- }
- }
- #endif /* CONFIG_NET_ARP_IPIN */
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