[101] | 1 | /**
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| 2 | * \addtogroup uip
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| 3 | * @{
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| 4 | */
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| 5 |
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| 6 | /**
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| 7 | * \defgroup uiparp uIP Address Resolution Protocol
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| 8 | * @{
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| 9 | *
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| 10 | * The Address Resolution Protocol ARP is used for mapping between IP
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| 11 | * addresses and link level addresses such as the Ethernet MAC
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| 12 | * addresses. ARP uses broadcast queries to ask for the link level
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| 13 | * address of a known IP address and the host which is configured with
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| 14 | * the IP address for which the query was meant, will respond with its
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| 15 | * link level address.
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| 16 | *
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| 17 | * \note This ARP implementation only supports Ethernet.
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| 18 | */
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| 19 |
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| 20 | /**
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| 21 | * \file
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| 22 | * Implementation of the ARP Address Resolution Protocol.
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| 23 | * \author Adam Dunkels <adam@dunkels.com>
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| 24 | *
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| 25 | */
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| 26 |
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| 27 | /*
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| 28 | * Copyright (c) 2001-2003, Adam Dunkels.
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| 29 | * All rights reserved.
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| 30 | *
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| 31 | * Redistribution and use in source and binary forms, with or without
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| 32 | * modification, are permitted provided that the following conditions
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| 33 | * are met:
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| 34 | * 1. Redistributions of source code must retain the above copyright
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| 35 | * notice, this list of conditions and the following disclaimer.
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| 36 | * 2. Redistributions in binary form must reproduce the above copyright
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| 37 | * notice, this list of conditions and the following disclaimer in the
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| 38 | * documentation and/or other materials provided with the distribution.
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| 39 | * 3. The name of the author may not be used to endorse or promote
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| 40 | * products derived from this software without specific prior
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| 41 | * written permission.
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| 42 | *
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| 43 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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| 44 | * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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| 45 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 46 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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| 47 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 48 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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| 49 | * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 50 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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| 51 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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| 52 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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| 53 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 54 | *
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| 55 | * This file is part of the uIP TCP/IP stack.
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| 56 | *
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| 57 | * $Id: uip_arp.c 108 2015-06-11 09:15:46Z coas-nagasima $
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| 58 | *
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| 59 | */
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| 60 |
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| 61 |
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| 62 | #include "uip_arp.h"
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| 63 |
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| 64 | #include <string.h>
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| 65 |
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| 66 | #ifdef __RX
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| 67 | #pragma pack
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| 68 | #elif _MSC_VER
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| 69 | #pragma pack(push, 1)
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| 70 | #endif
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| 71 |
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| 72 | struct arp_hdr {
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| 73 | struct uip_eth_hdr ethhdr;
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| 74 | u16_t hwtype;
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| 75 | u16_t protocol;
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| 76 | u8_t hwlen;
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| 77 | u8_t protolen;
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| 78 | u16_t opcode;
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| 79 | struct uip_eth_addr shwaddr;
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| 80 | u16_t sipaddr[2];
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| 81 | struct uip_eth_addr dhwaddr;
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| 82 | u16_t dipaddr[2];
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| 83 | };
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| 84 |
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| 85 | struct ethip_hdr {
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| 86 | struct uip_eth_hdr ethhdr;
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| 87 | /* IP header. */
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| 88 | u8_t vhl,
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| 89 | tos,
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| 90 | len[2],
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| 91 | ipid[2],
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| 92 | ipoffset[2],
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| 93 | ttl,
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| 94 | proto;
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| 95 | u16_t ipchksum;
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| 96 | u16_t srcipaddr[2],
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| 97 | destipaddr[2];
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| 98 | };
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| 99 |
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| 100 | #ifdef __RX
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| 101 | #pragma unpack
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| 102 | #elif _MSC_VER
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| 103 | #pragma pack(pop)
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| 104 | #endif
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| 105 |
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| 106 | #define ARP_REQUEST 1
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| 107 | #define ARP_REPLY 2
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| 108 |
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| 109 | #define ARP_HWTYPE_ETH 1
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| 110 |
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| 111 | struct arp_entry {
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| 112 | u16_t ipaddr[2];
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| 113 | struct uip_eth_addr ethaddr;
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| 114 | u8_t time;
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| 115 | };
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| 116 |
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| 117 | static const struct uip_eth_addr broadcast_ethaddr =
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| 118 | {{0xff,0xff,0xff,0xff,0xff,0xff}};
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| 119 | static const u16_t broadcast_ipaddr[2] = {0xffff,0xffff};
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| 120 | static const u16_t multicast_ipaddr[2] = { 0x00e0, 0x0000 };
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| 121 | static const u16_t multicast_mask[2] = { 0x00f0, 0x0000 };
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| 122 |
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| 123 | static struct arp_entry arp_table[UIP_ARPTAB_SIZE];
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| 124 | static u16_t ipaddr[2];
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| 125 | static u8_t i, c;
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| 126 |
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| 127 | static u8_t arptime;
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| 128 | static u8_t tmpage;
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| 129 |
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| 130 | #define BUF ((struct arp_hdr *)&uip_buf[0])
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| 131 | #define IPBUF ((struct ethip_hdr *)&uip_buf[0])
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| 132 | /*-----------------------------------------------------------------------------------*/
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| 133 | /**
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| 134 | * Initialize the ARP module.
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| 135 | *
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| 136 | */
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| 137 | /*-----------------------------------------------------------------------------------*/
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| 138 | void
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| 139 | uip_arp_init(void)
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| 140 | {
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| 141 | for(i = 0; i < UIP_ARPTAB_SIZE; ++i) {
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| 142 | memset(arp_table[i].ipaddr, 0, 4);
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| 143 | }
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| 144 | }
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| 145 | /*-----------------------------------------------------------------------------------*/
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| 146 | /**
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| 147 | * Periodic ARP processing function.
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| 148 | *
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| 149 | * This function performs periodic timer processing in the ARP module
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| 150 | * and should be called at regular intervals. The recommended interval
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| 151 | * is 10 seconds between the calls.
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| 152 | *
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| 153 | */
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| 154 | /*-----------------------------------------------------------------------------------*/
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| 155 | void
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| 156 | uip_arp_timer(void)
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| 157 | {
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| 158 | struct arp_entry *tabptr;
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| 159 |
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| 160 | ++arptime;
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| 161 | for(i = 0; i < UIP_ARPTAB_SIZE; ++i) {
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| 162 | tabptr = &arp_table[i];
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| 163 | if((tabptr->ipaddr[0] | tabptr->ipaddr[1]) != 0 &&
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| 164 | arptime - tabptr->time >= UIP_ARP_MAXAGE) {
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| 165 | memset(tabptr->ipaddr, 0, 4);
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| 166 | }
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| 167 | }
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| 168 |
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| 169 | }
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| 170 | /*-----------------------------------------------------------------------------------*/
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| 171 | static void
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| 172 | uip_arp_update(u16_t *ipaddr, struct uip_eth_addr *ethaddr)
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| 173 | {
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| 174 | register struct arp_entry *tabptr = NULL;
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| 175 | /* Walk through the ARP mapping table and try to find an entry to
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| 176 | update. If none is found, the IP -> MAC address mapping is
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| 177 | inserted in the ARP table. */
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| 178 | for(i = 0; i < UIP_ARPTAB_SIZE; ++i) {
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| 179 |
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| 180 | tabptr = &arp_table[i];
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| 181 | /* Only check those entries that are actually in use. */
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| 182 | if(tabptr->ipaddr[0] != 0 &&
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| 183 | tabptr->ipaddr[1] != 0) {
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| 184 |
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| 185 | /* Check if the source IP address of the incoming packet matches
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| 186 | the IP address in this ARP table entry. */
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| 187 | if(ipaddr[0] == tabptr->ipaddr[0] &&
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| 188 | ipaddr[1] == tabptr->ipaddr[1]) {
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| 189 |
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| 190 | /* An old entry found, update this and return. */
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| 191 | memcpy(tabptr->ethaddr.addr, ethaddr->addr, 6);
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| 192 | tabptr->time = arptime;
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| 193 |
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| 194 | return;
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| 195 | }
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| 196 | }
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| 197 | }
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| 198 |
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| 199 | /* If we get here, no existing ARP table entry was found, so we
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| 200 | create one. */
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| 201 |
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| 202 | /* First, we try to find an unused entry in the ARP table. */
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| 203 | for(i = 0; i < UIP_ARPTAB_SIZE; ++i) {
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| 204 | tabptr = &arp_table[i];
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| 205 | if(tabptr->ipaddr[0] == 0 &&
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| 206 | tabptr->ipaddr[1] == 0) {
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| 207 | break;
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| 208 | }
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| 209 | }
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| 210 |
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| 211 | /* If no unused entry is found, we try to find the oldest entry and
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| 212 | throw it away. */
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| 213 | if(i == UIP_ARPTAB_SIZE) {
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| 214 | tmpage = 0;
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| 215 | c = 0;
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| 216 | for(i = 0; i < UIP_ARPTAB_SIZE; ++i) {
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| 217 | tabptr = &arp_table[i];
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| 218 | if(arptime - tabptr->time > tmpage) {
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| 219 | tmpage = arptime - tabptr->time;
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| 220 | c = i;
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| 221 | }
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| 222 | }
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| 223 | i = c;
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| 224 | tabptr = &arp_table[i];
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| 225 | }
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| 226 |
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| 227 | /* Now, i is the ARP table entry which we will fill with the new
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| 228 | information. */
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| 229 | memcpy(tabptr->ipaddr, ipaddr, 4);
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| 230 | memcpy(tabptr->ethaddr.addr, ethaddr->addr, 6);
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| 231 | tabptr->time = arptime;
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| 232 | }
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| 233 | /*-----------------------------------------------------------------------------------*/
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| 234 | /**
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| 235 | * ARP processing for incoming IP packets
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| 236 | *
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| 237 | * This function should be called by the device driver when an IP
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| 238 | * packet has been received. The function will check if the address is
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| 239 | * in the ARP cache, and if so the ARP cache entry will be
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| 240 | * refreshed. If no ARP cache entry was found, a new one is created.
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| 241 | *
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| 242 | * This function expects an IP packet with a prepended Ethernet header
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| 243 | * in the uip_buf[] buffer, and the length of the packet in the global
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| 244 | * variable uip_len.
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| 245 | */
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| 246 | /*-----------------------------------------------------------------------------------*/
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| 247 | #if 0
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| 248 | void
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| 249 | uip_arp_ipin(void)
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| 250 | {
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| 251 | uip_len -= sizeof(struct uip_eth_hdr);
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| 252 |
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| 253 | /* Only insert/update an entry if the source IP address of the
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| 254 | incoming IP packet comes from a host on the local network. */
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| 255 | if((IPBUF->srcipaddr[0] & uip_netmask[0]) !=
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| 256 | (uip_hostaddr[0] & uip_netmask[0])) {
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| 257 | return;
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| 258 | }
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| 259 | if((IPBUF->srcipaddr[1] & uip_netmask[1]) !=
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| 260 | (uip_hostaddr[1] & uip_netmask[1])) {
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| 261 | return;
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| 262 | }
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| 263 | uip_arp_update(IPBUF->srcipaddr, &(IPBUF->ethhdr.src));
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| 264 |
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| 265 | return;
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| 266 | }
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| 267 | #endif /* 0 */
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| 268 | /*-----------------------------------------------------------------------------------*/
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| 269 | /**
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| 270 | * ARP processing for incoming ARP packets.
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| 271 | *
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| 272 | * This function should be called by the device driver when an ARP
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| 273 | * packet has been received. The function will act differently
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| 274 | * depending on the ARP packet type: if it is a reply for a request
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| 275 | * that we previously sent out, the ARP cache will be filled in with
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| 276 | * the values from the ARP reply. If the incoming ARP packet is an ARP
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| 277 | * request for our IP address, an ARP reply packet is created and put
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| 278 | * into the uip_buf[] buffer.
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| 279 | *
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| 280 | * When the function returns, the value of the global variable uip_len
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| 281 | * indicates whether the device driver should send out a packet or
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| 282 | * not. If uip_len is zero, no packet should be sent. If uip_len is
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| 283 | * non-zero, it contains the length of the outbound packet that is
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| 284 | * present in the uip_buf[] buffer.
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| 285 | *
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| 286 | * This function expects an ARP packet with a prepended Ethernet
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| 287 | * header in the uip_buf[] buffer, and the length of the packet in the
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| 288 | * global variable uip_len.
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| 289 | */
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| 290 | /*-----------------------------------------------------------------------------------*/
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| 291 | void
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| 292 | uip_arp_arpin(void)
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| 293 | {
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| 294 |
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| 295 | if(uip_len < sizeof(struct arp_hdr)) {
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| 296 | uip_len = 0;
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| 297 | return;
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| 298 | }
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| 299 | uip_len = 0;
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| 300 |
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| 301 | switch(BUF->opcode) {
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| 302 | case HTONS(ARP_REQUEST):
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| 303 | /* ARP request. If it asked for our address, we send out a
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| 304 | reply. */
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| 305 | if(uip_ipaddr_cmp(BUF->dipaddr, uip_hostaddr)) {
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| 306 | /* First, we register the one who made the request in our ARP
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| 307 | table, since it is likely that we will do more communication
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| 308 | with this host in the future. */
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| 309 | uip_arp_update(BUF->sipaddr, &BUF->shwaddr);
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| 310 |
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| 311 | /* The reply opcode is 2. */
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| 312 | BUF->opcode = HTONS(2);
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| 313 |
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| 314 | memcpy(BUF->dhwaddr.addr, BUF->shwaddr.addr, 6);
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| 315 | memcpy(BUF->shwaddr.addr, uip_ethaddr.addr, 6);
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| 316 | memcpy(BUF->ethhdr.src.addr, uip_ethaddr.addr, 6);
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| 317 | memcpy(BUF->ethhdr.dest.addr, BUF->dhwaddr.addr, 6);
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| 318 |
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| 319 | BUF->dipaddr[0] = BUF->sipaddr[0];
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| 320 | BUF->dipaddr[1] = BUF->sipaddr[1];
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| 321 | BUF->sipaddr[0] = uip_hostaddr[0];
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| 322 | BUF->sipaddr[1] = uip_hostaddr[1];
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| 323 |
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| 324 | BUF->ethhdr.type = HTONS(UIP_ETHTYPE_ARP);
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| 325 | uip_len = sizeof(struct arp_hdr);
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| 326 | }
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| 327 | break;
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| 328 | case HTONS(ARP_REPLY):
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| 329 | /* ARP reply. We insert or update the ARP table if it was meant
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| 330 | for us. */
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| 331 | if(uip_ipaddr_cmp(BUF->dipaddr, uip_hostaddr)) {
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| 332 | uip_arp_update(BUF->sipaddr, &BUF->shwaddr);
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| 333 | }
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| 334 | break;
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| 335 | }
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| 336 |
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| 337 | return;
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| 338 | }
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| 339 | /*-----------------------------------------------------------------------------------*/
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| 340 | /**
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| 341 | * Prepend Ethernet header to an outbound IP packet and see if we need
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| 342 | * to send out an ARP request.
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| 343 | *
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| 344 | * This function should be called before sending out an IP packet. The
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| 345 | * function checks the destination IP address of the IP packet to see
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| 346 | * what Ethernet MAC address that should be used as a destination MAC
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| 347 | * address on the Ethernet.
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| 348 | *
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| 349 | * If the destination IP address is in the local network (determined
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| 350 | * by logical ANDing of netmask and our IP address), the function
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| 351 | * checks the ARP cache to see if an entry for the destination IP
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| 352 | * address is found. If so, an Ethernet header is prepended and the
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| 353 | * function returns. If no ARP cache entry is found for the
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| 354 | * destination IP address, the packet in the uip_buf[] is replaced by
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| 355 | * an ARP request packet for the IP address. The IP packet is dropped
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| 356 | * and it is assumed that they higher level protocols (e.g., TCP)
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| 357 | * eventually will retransmit the dropped packet.
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| 358 | *
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| 359 | * If the destination IP address is not on the local network, the IP
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| 360 | * address of the default router is used instead.
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| 361 | *
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| 362 | * When the function returns, a packet is present in the uip_buf[]
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| 363 | * buffer, and the length of the packet is in the global variable
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| 364 | * uip_len.
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| 365 | */
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| 366 | /*-----------------------------------------------------------------------------------*/
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| 367 | void
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| 368 | uip_arp_out(void)
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| 369 | {
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| 370 | struct arp_entry *tabptr = NULL;
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| 371 |
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| 372 | /* Find the destination IP address in the ARP table and construct
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| 373 | the Ethernet header. If the destination IP addres isn't on the
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| 374 | local network, we use the default router's IP address instead.
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| 375 |
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| 376 | If not ARP table entry is found, we overwrite the original IP
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| 377 | packet with an ARP request for the IP address. */
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| 378 |
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| 379 | /* First check if destination is a local broadcast. */
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| 380 | if(uip_ipaddr_cmp(IPBUF->destipaddr, broadcast_ipaddr)) {
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| 381 | memcpy(IPBUF->ethhdr.dest.addr, broadcast_ethaddr.addr, 6);
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| 382 | }
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| 383 | else if(uip_ipaddr_maskcmp(IPBUF->destipaddr, multicast_ipaddr, multicast_mask)) {
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| 384 | IPBUF->ethhdr.dest.addr[0] = 0x01;
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| 385 | IPBUF->ethhdr.dest.addr[1] = 0x00;
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| 386 | IPBUF->ethhdr.dest.addr[2] = 0x5E;
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| 387 | IPBUF->ethhdr.dest.addr[3] = uip_ipaddr2(IPBUF->destipaddr) & 0x7F;
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| 388 | IPBUF->ethhdr.dest.addr[4] = uip_ipaddr3(IPBUF->destipaddr);
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| 389 | IPBUF->ethhdr.dest.addr[5] = uip_ipaddr4(IPBUF->destipaddr);
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| 390 | } else {
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| 391 | /* Check if the destination address is on the local network. */
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| 392 | if(!uip_ipaddr_maskcmp(IPBUF->destipaddr, uip_hostaddr, uip_netmask)) {
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| 393 | /* Destination address was not on the local network, so we need to
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| 394 | use the default router's IP address instead of the destination
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| 395 | address when determining the MAC address. */
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| 396 | uip_ipaddr_copy(ipaddr, uip_draddr);
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| 397 | } else {
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| 398 | /* Else, we use the destination IP address. */
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| 399 | uip_ipaddr_copy(ipaddr, IPBUF->destipaddr);
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| 400 | }
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| 401 |
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| 402 | for(i = 0; i < UIP_ARPTAB_SIZE; ++i) {
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| 403 | tabptr = &arp_table[i];
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| 404 | if(uip_ipaddr_cmp(ipaddr, tabptr->ipaddr)) {
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| 405 | break;
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| 406 | }
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| 407 | }
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| 408 |
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| 409 | if(i == UIP_ARPTAB_SIZE) {
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| 410 | /* The destination address was not in our ARP table, so we
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| 411 | overwrite the IP packet with an ARP request. */
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| 412 |
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| 413 | memset(BUF->ethhdr.dest.addr, 0xff, 6);
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| 414 | memset(BUF->dhwaddr.addr, 0x00, 6);
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| 415 | memcpy(BUF->ethhdr.src.addr, uip_ethaddr.addr, 6);
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| 416 | memcpy(BUF->shwaddr.addr, uip_ethaddr.addr, 6);
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| 417 |
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| 418 | uip_ipaddr_copy(BUF->dipaddr, ipaddr);
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| 419 | uip_ipaddr_copy(BUF->sipaddr, uip_hostaddr);
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| 420 | BUF->opcode = HTONS(ARP_REQUEST); /* ARP request. */
|
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| 421 | BUF->hwtype = HTONS(ARP_HWTYPE_ETH);
|
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| 422 | BUF->protocol = HTONS(UIP_ETHTYPE_IP);
|
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| 423 | BUF->hwlen = 6;
|
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| 424 | BUF->protolen = 4;
|
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| 425 | BUF->ethhdr.type = HTONS(UIP_ETHTYPE_ARP);
|
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| 426 |
|
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| 427 | uip_appdata = &uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN];
|
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| 428 |
|
---|
| 429 | uip_len = sizeof(struct arp_hdr);
|
---|
| 430 | return;
|
---|
| 431 | }
|
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| 432 |
|
---|
| 433 | /* Build an ethernet header. */
|
---|
| 434 | memcpy(IPBUF->ethhdr.dest.addr, tabptr->ethaddr.addr, 6);
|
---|
| 435 | }
|
---|
| 436 | memcpy(IPBUF->ethhdr.src.addr, uip_ethaddr.addr, 6);
|
---|
| 437 |
|
---|
| 438 | IPBUF->ethhdr.type = HTONS(UIP_ETHTYPE_IP);
|
---|
| 439 |
|
---|
| 440 | uip_len += sizeof(struct uip_eth_hdr);
|
---|
| 441 | }
|
---|
| 442 | /*-----------------------------------------------------------------------------------*/
|
---|
| 443 |
|
---|
| 444 | /** @} */
|
---|
| 445 | /** @} */
|
---|