Projects/Webserver/Lib/uip/uip_arp.h

   1 /**
   2  * \addtogroup uip
   3  * @{
   4  */
   5
   6 /**
   7  * \addtogroup uiparp
   8  * @{
   9  */
  10
  11 /**
  12  * \file
  13  * Macros and definitions for the ARP module.
  14  * \author Adam Dunkels <adam@dunkels.com>
  15  */
  16
  17
  18 /*
  19  * Copyright (c) 2001-2003, Adam Dunkels.
  20  * All rights reserved.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the above copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. The name of the author may not be used to endorse or promote
  31  *    products derived from this software without specific prior
  32  *    written permission.
  33  *
  34  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  35  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  36  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  37  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  38  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  39  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  40  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  41  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  42  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  43  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  44  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  45  *
  46  * This file is part of the uIP TCP/IP stack.
  47  *
  48  * $Id: uip_arp.h,v 1.2 2006/08/26 23:58:45 oliverschmidt Exp $
  49  *
  50  */
  51
  52 #ifndef __UIP_ARP_H__
  53 #define __UIP_ARP_H__
  54
  55 #include "uip.h"
  56
  57
  58 extern struct uip_eth_addr uip_ethaddr;
  59
  60 /**
  61  * The Ethernet header.
  62  */
  63 struct uip_eth_hdr {
  64   struct uip_eth_addr dest;
  65   struct uip_eth_addr src;
  66   u16_t type;
  67 };
  68
  69 #define UIP_ETHTYPE_ARP  0x0806
  70 #define UIP_ETHTYPE_IP   0x0800
  71 #define UIP_ETHTYPE_IPV6 0x86dd
  72
  73
  74 /* The uip_arp_init() function must be called before any of the other
  75    ARP functions. */
  76 void uip_arp_init(void);
  77
  78 /* The uip_arp_ipin() function should be called whenever an IP packet
  79    arrives from the Ethernet. This function refreshes the ARP table or
  80    inserts a new mapping if none exists. The function assumes that an
  81    IP packet with an Ethernet header is present in the uip_buf buffer
  82    and that the length of the packet is in the uip_len variable. */
  83 /*void uip_arp_ipin(void);*/
  84 #define uip_arp_ipin()
  85
  86 /* The uip_arp_arpin() should be called when an ARP packet is received
  87    by the Ethernet driver. This function also assumes that the
  88    Ethernet frame is present in the uip_buf buffer. When the
  89    uip_arp_arpin() function returns, the contents of the uip_buf
  90    buffer should be sent out on the Ethernet if the uip_len variable
  91    is > 0. */
  92 void uip_arp_arpin(void);
  93
  94 /* The uip_arp_out() function should be called when an IP packet
  95    should be sent out on the Ethernet. This function creates an
  96    Ethernet header before the IP header in the uip_buf buffer. The
  97    Ethernet header will have the correct Ethernet MAC destination
  98    address filled in if an ARP table entry for the destination IP
  99    address (or the IP address of the default router) is present. If no
 100    such table entry is found, the IP packet is overwritten with an ARP
 101    request and we rely on TCP to retransmit the packet that was
 102    overwritten. In any case, the uip_len variable holds the length of
 103    the Ethernet frame that should be transmitted. */
 104 void uip_arp_out(void);
 105
 106 /* The uip_arp_timer() function should be called every ten seconds. It
 107    is responsible for flushing old entries in the ARP table. */
 108 void uip_arp_timer(void);
 109
 110 /** @} */
 111
 112 /**
 113  * \addtogroup uipconffunc
 114  * @{
 115  */
 116
 117
 118 /**
 119  * Specifiy the Ethernet MAC address.
 120  *
 121  * The ARP code needs to know the MAC address of the Ethernet card in
 122  * order to be able to respond to ARP queries and to generate working
 123  * Ethernet headers.
 124  *
 125  * \note This macro only specifies the Ethernet MAC address to the ARP
 126  * code. It cannot be used to change the MAC address of the Ethernet
 127  * card.
 128  *
 129  * \param eaddr A pointer to a struct uip_eth_addr containing the
 130  * Ethernet MAC address of the Ethernet card.
 131  *
 132  * \hideinitializer
 133  */
 134 #define uip_setethaddr(eaddr) do {uip_ethaddr.addr[0] = eaddr.addr[0]; \
 135                               uip_ethaddr.addr[1] = eaddr.addr[1];\
 136                               uip_ethaddr.addr[2] = eaddr.addr[2];\
 137                               uip_ethaddr.addr[3] = eaddr.addr[3];\
 138                               uip_ethaddr.addr[4] = eaddr.addr[4];\
 139                               uip_ethaddr.addr[5] = eaddr.addr[5];} while(0)
 140
 141 /** @} */
 142
 143
 144 #endif /* __UIP_ARP_H__ */
 145 /** @} */
 146