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# uip/uip_arp.h

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    00001 /**
    00002  * \addtogroup uip
    00003  * @{
    00004  */
    00005
    00006 /**
    00007  * \addtogroup uiparp
    00008  * @{
    00009  */
    00010
    00011 /**
    00012  * \file
    00013  * Macros and definitions for the ARP module.
    00014  * \author Adam Dunkels <adam@dunkels.com>
    00015  */
    00016
    00017
    00018 /*
    00019  * Copyright (c) 2001-2003, Adam Dunkels.
    00020  * All rights reserved.
    00021  *
    00022  * Redistribution and use in source and binary forms, with or without
    00023  * modification, are permitted provided that the following conditions
    00024  * are met:
    00025  * 1. Redistributions of source code must retain the above copyright
    00026  *    notice, this list of conditions and the following disclaimer.
    00027  * 2. Redistributions in binary form must reproduce the above copyright
    00028  *    notice, this list of conditions and the following disclaimer in the
    00029  *    documentation and/or other materials provided with the distribution.
    00030  * 3. The name of the author may not be used to endorse or promote
    00031  *    products derived from this software without specific prior
    00032  *    written permission.
    00033  *
    00034  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
    00035  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
    00036  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    00037  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
    00038  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    00039  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
    00040  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    00041  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
    00042  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
    00043  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    00044  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    00045  *
    00046  * This file is part of the uIP TCP/IP stack.
    00047  *
    00048  * $Id: uip_arp.h,v 1.5 2006/06/11 21:46:39 adam Exp $
    00049  *
    00050  */
    00051
    00052 #ifndef __UIP_ARP_H__
    00053 #define __UIP_ARP_H__
    00054
    00055 #include "uip.h"
    00056
    00057
    00058 extern struct uip_eth_addr uip_ethaddr;
    00059
    00060 /**
    00061  * The Ethernet header.
    00062  */
    00063 struct uip_eth_hdr {
    00064   struct uip_eth_addr dest;
    00065   struct uip_eth_addr src;
    00066   u16_t type;
    00067 };
    00068
    00069 #define UIP_ETHTYPE_ARP 0x0806
    00070 #define UIP_ETHTYPE_IP  0x0800
    00071 #define UIP_ETHTYPE_IP6 0x86dd
    00072
    00073
    00074 /* The uip_arp_init() function must be called before any of the other
    00075    ARP functions. */
    00076 void uip_arp_init(void);
    00077
    00078 /* The uip_arp_ipin() function should be called whenever an IP packet
    00079    arrives from the Ethernet. This function refreshes the ARP table or
    00080    inserts a new mapping if none exists. The function assumes that an
    00081    IP packet with an Ethernet header is present in the uip_buf buffer
    00082    and that the length of the packet is in the uip_len variable. */
    00083 /*void uip_arp_ipin(void);*/
    00084 #define uip_arp_ipin()
    00085
    00086 /* The uip_arp_arpin() should be called when an ARP packet is received
    00087    by the Ethernet driver. This function also assumes that the
    00088    Ethernet frame is present in the uip_buf buffer. When the
    00089    uip_arp_arpin() function returns, the contents of the uip_buf
    00090    buffer should be sent out on the Ethernet if the uip_len variable
    00091    is > 0. */
    00092 void uip_arp_arpin(void);
    00093
    00094 /* The uip_arp_out() function should be called when an IP packet
    00095    should be sent out on the Ethernet. This function creates an
    00096    Ethernet header before the IP header in the uip_buf buffer. The
    00097    Ethernet header will have the correct Ethernet MAC destination
    00098    address filled in if an ARP table entry for the destination IP
    00099    address (or the IP address of the default router) is present. If no
    00100    such table entry is found, the IP packet is overwritten with an ARP
    00101    request and we rely on TCP to retransmit the packet that was
    00102    overwritten. In any case, the uip_len variable holds the length of
    00103    the Ethernet frame that should be transmitted. */
    00104 void uip_arp_out(void);
    00105
    00106 /* The uip_arp_timer() function should be called every ten seconds. It
    00107    is responsible for flushing old entries in the ARP table. */
    00108 void uip_arp_timer(void);
    00109
    00110 /** @} */
    00111
    00112 /**
    00113  * \addtogroup uipconffunc
    00114  * @{
    00115  */
    00116
    00117
    00118 /**
    00119  * Specifiy the Ethernet MAC address.
    00120  *
    00121  * The ARP code needs to know the MAC address of the Ethernet card in
    00122  * order to be able to respond to ARP queries and to generate working
    00123  * Ethernet headers.
    00124  *
    00125  * \note This macro only specifies the Ethernet MAC address to the ARP
    00126  * code. It cannot be used to change the MAC address of the Ethernet
    00127  * card.
    00128  *
    00129  * \param eaddr A pointer to a struct uip_eth_addr containing the
    00130  * Ethernet MAC address of the Ethernet card.
    00131  *
    00132  * \hideinitializer
    00133  */
    00134 #define uip_setethaddr(eaddr) do {uip_ethaddr.addr[0] = eaddr.addr[0]; \
    00135                               uip_ethaddr.addr[1] = eaddr.addr[1];\
    00136                               uip_ethaddr.addr[2] = eaddr.addr[2];\
    00137                               uip_ethaddr.addr[3] = eaddr.addr[3];\
    00138                               uip_ethaddr.addr[4] = eaddr.addr[4];\
    00139                               uip_ethaddr.addr[5] = eaddr.addr[5];} while(0)
    00140
    00141 /** @} */
    00142 /** @} */
    00143
    00144 #endif /* __UIP_ARP_H__ */