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/* uip-arp.h
* Macros and definitions for the ARP module.
* 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.
*
*/
#ifndef __UIP_ARP_H__
#define __UIP_ARP_H__
#include <sys/types.h>
#include <nuttx/compiler.h>
#include <net/uip/uip.h>
/* The Ethernet header -- 14 bytes. The first two fields are type 'struct
* uip_eth_addr but are represented as a simple byte array here because
* some compilers refuse to pack 6 byte structures.
*/
struct uip_eth_hdr
{
uint8 dest[6]; /* Ethernet destination address (6 bytes) */
uint8 src[6]; /* Ethernet source address (6 bytes) */
uint16 type; /* Type code (2 bytes) */
};
/* Recognized values of the type bytes in the Ethernet header */
#define UIP_ETHTYPE_ARP 0x0806
#define UIP_ETHTYPE_IP 0x0800
#define UIP_ETHTYPE_IP6 0x86dd
/* The uip_arp_init() function must be called before any of the other
* ARP functions.
*/
void uip_arp_init(void);
/* The uip_arp_ipin() function should be called whenever an IP packet
* arrives from the Ethernet. This function refreshes the ARP table or
* inserts a new mapping if none exists. The function assumes 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.
*/
#define uip_arp_ipin()
/* The uip_arp_arpin() should be called when an ARP packet is received
* by the Ethernet driver. This function also assumes that the
* Ethernet frame is present in the d_buf buffer. When the
* uip_arp_arpin() function returns, the contents of the d_buf
* buffer should be sent out on the Ethernet if the d_len field
* is > 0.
*/
void uip_arp_arpin(struct uip_driver_s *dev);
/* The uip_arp_out() function should be called when an IP packet
* should be sent out on the Ethernet. This function creates an
* Ethernet header before the IP header in the d_buf buffer. The
* Ethernet header will have the correct Ethernet MAC destination
* address filled in if an ARP table entry for the destination IP
* address (or the IP address of the default router) is present. If no
* such table entry is found, the IP packet is overwritten with an ARP
* request and we rely on TCP to retransmit the packet that was
* overwritten. In any case, the d_len field holds the length of
* the Ethernet frame that should be transmitted.
*/
void uip_arp_out(struct uip_driver_s *dev);
/* The uip_arp_timer() function should be called every ten seconds. It
* is responsible for flushing old entries in the ARP table.
*/
void uip_arp_timer(void);
#endif /* __UIP_ARP_H__ */
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