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