122 lines
4.4 KiB
C
122 lines
4.4 KiB
C
/****************************************************************************
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* net/arp/arp_format.c
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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 <string.h>
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#include <debug.h>
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#include <netinet/in.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/arp.h>
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#include "arp/arp.h"
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#ifdef CONFIG_NET_ARP
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define ETHBUF ((struct eth_hdr_s *)&dev->d_buf[0])
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#define ARPBUF ((struct arp_hdr_s *)&dev->d_buf[ETH_HDRLEN])
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: arp_format
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*
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* Description:
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* Format an ARP packet.
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*
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* Input Parameters:
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* dev - Device structure
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* ipaddr - Target IP address (32-bit)
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void arp_format(FAR struct net_driver_s *dev, in_addr_t ipaddr)
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{
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FAR struct arp_hdr_s *arp = ARPBUF;
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FAR struct eth_hdr_s *eth = ETHBUF;
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/* Construct the ARP packet. Creating both the Ethernet and ARP headers */
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memset(eth->dest, 0xff, ETHER_ADDR_LEN);
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memset(arp->ah_dhwaddr, 0x00, ETHER_ADDR_LEN);
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memcpy(eth->src, dev->d_mac.ether_addr_octet, ETHER_ADDR_LEN);
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memcpy(arp->ah_shwaddr, dev->d_mac.ether_addr_octet, ETHER_ADDR_LEN);
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net_ipv4addr_hdrcopy(arp->ah_dipaddr, &ipaddr);
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net_ipv4addr_hdrcopy(arp->ah_sipaddr, &dev->d_ipaddr);
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arp->ah_opcode = HTONS(ARP_REQUEST);
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arp->ah_hwtype = HTONS(ARP_HWTYPE_ETH);
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arp->ah_protocol = HTONS(ETHTYPE_IP);
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arp->ah_hwlen = ETHER_ADDR_LEN;
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arp->ah_protolen = 4;
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eth->type = HTONS(ETHTYPE_ARP);
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dev->d_len = sizeof(struct arp_hdr_s) + ETH_HDRLEN;
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}
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#endif /* CONFIG_NET_ARP */
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