1 | /*
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2 | * TINET (TCP/IP Protocol Stack)
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3 | *
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4 | * Copyright (C) 2001-2009 by Dep. of Computer Science and Engineering
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5 | * Tomakomai National College of Technology, JAPAN
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6 | *
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7 | * ä¸è¨èä½æ¨©è
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8 | ã¯ï¼ä»¥ä¸ã® (1)ï½(4) ã®æ¡ä»¶ãï¼Free Software Foundation
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9 | * ã«ãã£ã¦å
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10 | ¬è¡¨ããã¦ãã GNU General Public License ã® Version 2 ã«è¨
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11 | * è¿°ããã¦ããæ¡ä»¶ãæºããå ´åã«éãï¼æ¬ã½ããã¦ã§ã¢ï¼æ¬ã½ããã¦ã§ã¢
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12 | * ãæ¹å¤ãããã®ãå«ãï¼ä»¥ä¸åãï¼ã使ç¨ã»è¤è£½ã»æ¹å¤ã»åé
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13 | å¸ï¼ä»¥ä¸ï¼
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14 | * å©ç¨ã¨å¼ã¶ï¼ãããã¨ãç¡åã§è¨±è«¾ããï¼
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15 | * (1) æ¬ã½ããã¦ã§ã¢ãã½ã¼ã¹ã³ã¼ãã®å½¢ã§å©ç¨ããå ´åã«ã¯ï¼ä¸è¨ã®èä½
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16 | * 権表示ï¼ãã®å©ç¨æ¡ä»¶ããã³ä¸è¨ã®ç¡ä¿è¨¼è¦å®ãï¼ãã®ã¾ã¾ã®å½¢ã§ã½ã¼
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17 | * ã¹ã³ã¼ãä¸ã«å«ã¾ãã¦ãããã¨ï¼
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18 | * (2) æ¬ã½ããã¦ã§ã¢ãï¼ã©ã¤ãã©ãªå½¢å¼ãªã©ï¼ä»ã®ã½ããã¦ã§ã¢éçºã«ä½¿
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19 | * ç¨ã§ããå½¢ã§åé
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20 | å¸ããå ´åã«ã¯ï¼åé
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21 | å¸ã«ä¼´ãããã¥ã¡ã³ãï¼å©ç¨
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22 | * è
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23 | ããã¥ã¢ã«ãªã©ï¼ã«ï¼ä¸è¨ã®èä½æ¨©è¡¨ç¤ºï¼ãã®å©ç¨æ¡ä»¶ããã³ä¸è¨
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24 | * ã®ç¡ä¿è¨¼è¦å®ãæ²è¼ãããã¨ï¼
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25 | * (3) æ¬ã½ããã¦ã§ã¢ãï¼æ©å¨ã«çµã¿è¾¼ããªã©ï¼ä»ã®ã½ããã¦ã§ã¢éçºã«ä½¿
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26 | * ç¨ã§ããªãå½¢ã§åé
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27 | å¸ããå ´åã«ã¯ï¼æ¬¡ã®æ¡ä»¶ãæºãããã¨ï¼
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28 | * (a) åé
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29 | å¸ã«ä¼´ãããã¥ã¡ã³ãï¼å©ç¨è
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30 | ããã¥ã¢ã«ãªã©ï¼ã«ï¼ä¸è¨ã®è
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31 | * ä½æ¨©è¡¨ç¤ºï¼ãã®å©ç¨æ¡ä»¶ããã³ä¸è¨ã®ç¡ä¿è¨¼è¦å®ãæ²è¼ãããã¨ï¼
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32 | * (4) æ¬ã½ããã¦ã§ã¢ã®å©ç¨ã«ããç´æ¥çã¾ãã¯éæ¥çã«çãããããªãæ
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33 | * 害ãããï¼ä¸è¨èä½æ¨©è
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34 | ããã³TOPPERSããã¸ã§ã¯ããå
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35 | 責ãããã¨ï¼
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36 | *
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37 | * æ¬ã½ããã¦ã§ã¢ã¯ï¼ç¡ä¿è¨¼ã§æä¾ããã¦ãããã®ã§ããï¼ä¸è¨èä½æ¨©è
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38 | ã
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39 | * ãã³TOPPERSããã¸ã§ã¯ãã¯ï¼æ¬ã½ããã¦ã§ã¢ã«é¢ãã¦ï¼ãã®é©ç¨å¯è½æ§ã
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40 | * å«ãã¦ï¼ãããªãä¿è¨¼ãè¡ããªãï¼ã¾ãï¼æ¬ã½ããã¦ã§ã¢ã®å©ç¨ã«ããç´
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41 | * æ¥çã¾ãã¯éæ¥çã«çãããããªãæ害ã«é¢ãã¦ãï¼ãã®è²¬ä»»ãè² ããªãï¼
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42 | *
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43 | * @(#) $Id: if_ether.c 270 2017-02-09 04:03:47Z coas-nagasima $
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44 | */
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45 |
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46 | /*
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47 | * Copyright (c) 1982, 1986, 1988, 1993
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48 | * The Regents of the University of California. All rights reserved.
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49 | *
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50 | * Redistribution and use in source and binary forms, with or without
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51 | * modification, are permitted provided that the following conditions
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52 | * are met:
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53 | * 1. Redistributions of source code must retain the above copyright
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54 | * notice, this list of conditions and the following disclaimer.
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55 | * 2. Redistributions in binary form must reproduce the above copyright
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56 | * notice, this list of conditions and the following disclaimer in the
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57 | * documentation and/or other materials provided with the distribution.
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58 | * 3. All advertising materials mentioning features or use of this software
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59 | * must display the following acknowledgement:
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60 | * This product includes software developed by the University of
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61 | * California, Berkeley and its contributors.
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62 | * 4. Neither the name of the University nor the names of its contributors
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63 | * may be used to endorse or promote products derived from this software
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64 | * without specific prior written permission.
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65 | *
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66 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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67 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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68 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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69 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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70 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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71 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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72 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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73 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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74 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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75 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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76 | * SUCH DAMAGE.
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77 | *
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78 | * @(#)if_ether.c 8.1 (Berkeley) 6/10/93
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79 | * $FreeBSD: src/sys/netinet/if_ether.c,v 1.52.2.6 1999/10/18 11:59:31 sheldonh Exp $
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80 | */
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81 |
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82 | #include <string.h>
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83 |
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84 | #ifdef TARGET_KERNEL_ASP
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85 |
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86 | #include <kernel.h>
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87 | #include <sil.h>
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88 | #include <t_syslog.h>
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89 | #include "kernel_cfg.h"
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90 |
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91 | #endif /* of #ifdef TARGET_KERNEL_ASP */
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92 |
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93 | #ifdef TARGET_KERNEL_JSP
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94 |
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95 | #include <s_services.h>
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96 | #include <t_services.h>
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97 | #include "kernel_id.h"
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98 |
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99 | #endif /* of #ifdef TARGET_KERNEL_JSP */
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100 |
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101 | #include <tinet_defs.h>
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102 | #include <tinet_config.h>
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103 |
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104 | #include <net/if.h>
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105 | #include <net/ethernet.h>
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106 | #include <net/if_arp.h>
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107 | #include <net/net.h>
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108 | #include <net/net_buf.h>
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109 | #include <net/net_var.h>
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110 | #include <net/net_timer.h>
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111 | #include <net/net_count.h>
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112 |
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113 | #include <netinet/in.h>
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114 | #include <netinet/in_var.h>
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115 | #include <netinet/ip.h>
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116 | #include <netinet/if_ether.h>
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117 |
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118 | #include <net/if_var.h>
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119 |
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120 | #if defined(SUPPORT_INET4) && defined(SUPPORT_ETHER)
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121 |
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122 | /*
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123 | * ARP ãã£ãã·ã¥ã¨ã³ããª
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124 | */
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125 |
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126 | static T_ARP_ENTRY arp_cache[NUM_ARP_ENTRY];
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127 |
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128 | /*
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129 | * é¢æ°
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130 | */
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131 |
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132 | static T_ARP_ENTRY *arp_lookup (T_IN4_ADDR addr, bool_t create);
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133 | static void in_arpinput (T_IF_ADDR *ifaddr, T_NET_BUF *input);
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134 | static void arp_timer (void *ignore);
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135 |
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136 | /*
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137 | * arp_lookup -- ARP ãã£ãã·ã¥ã®æ¢ç´¢ã¨ç»é²
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138 | *
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139 | * 注æ: SEM_ARP_CACHE_LOCK ãç²å¾ããç¶æ
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140 | ã§å¼åºããã¨
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141 | */
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142 |
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143 | static T_ARP_ENTRY *
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144 | arp_lookup (T_IN4_ADDR addr, bool_t create)
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145 | {
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146 | int_t ix, six;
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147 | uint16_t min;
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148 |
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149 | for (ix = NUM_ARP_ENTRY; ix -- > 0; ) {
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150 | if (arp_cache[ix].expire && arp_cache[ix].ip_addr == addr)
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151 | return &arp_cache[ix];
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152 | }
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153 |
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154 | /* create ãçãªããæ°ããªã¨ã³ããªãç»é²ããã*/
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155 | if (create) {
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156 |
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157 | /* ã¾ãã空ããããã°ããã®ç©ºããå©ç¨ããã*/
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158 | for (ix = NUM_ARP_ENTRY; ix -- > 0; ) {
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159 | if (arp_cache[ix].expire == 0) {
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160 | arp_cache[ix].ip_addr = addr;
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161 | return &arp_cache[ix];
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162 | }
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163 | }
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164 |
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165 | /*
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166 | * 空ãããªããã°ãã¿ã¤ã ã¢ã¦ãã¾ã§æéãæçã®
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167 | * ã¨ã³ããªã¼ãç ´æ£ãã¦å©ç¨ããã
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168 | */
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169 | syslog(LOG_NOTICE, "[ARP] cache busy, size=%d", NUM_ARP_ENTRY);
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170 | min = 0xffff;
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171 | for (six = ix = NUM_ARP_ENTRY; ix -- > 0; )
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172 | if (arp_cache[ix].expire < min) {
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173 | six = ix;
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174 | min = arp_cache[ix].expire;
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175 | }
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176 | arp_cache[six].expire = 0;
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177 | arp_cache[six].ip_addr = addr;
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178 | return &arp_cache[six];
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179 | }
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180 | else
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181 | return NULL;
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182 | }
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183 |
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184 | /*
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185 | * in_arpinput -- TCP/IP ç¨ ARP ã®å
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186 | ¥åé¢æ°
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187 | */
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188 |
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189 | static void
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190 | in_arpinput (T_IF_ADDR *ifaddr, T_NET_BUF *input)
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191 | {
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192 | T_NET_BUF *pending;
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193 | T_ETHER_HDR *eth;
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194 | T_ARP_HDR *arph;
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195 | T_ETHER_ARP_HDR *et_arph;
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196 | T_ARP_ENTRY *ent;
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197 | T_IFNET *ifp = IF_GET_IFNET();
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198 | T_IN4_ADDR saddr, taddr;
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199 |
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200 | et_arph = GET_ETHER_ARP_HDR(input);
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201 |
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202 | ntoahl(saddr, et_arph->sproto); /* éä¿¡å
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203 | IP ã¢ãã¬ã¹ */
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204 | ntoahl(taddr, et_arph->tproto); /* 解決対象 IP ã¢ãã¬ã¹ */
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205 |
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206 | /*
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207 | * 以ä¸ã®å ´åã¯ã¨ã©ã¼
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208 | * ã»éä¿¡ãã¹ãã®ç©çã¢ãã¬ã¹ãèªå
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209 | * ã»éä¿¡ãã¹ãã®ç©çã¢ãã¬ã¹ãããã¼ããã£ã¹ã
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210 | */
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211 | if (memcmp(et_arph->shost, ifaddr->lladdr, ETHER_ADDR_LEN) == 0 ||
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212 | memcmp(et_arph->shost, ether_broad_cast_addr, ETHER_ADDR_LEN) == 0)
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213 | goto err_ret;
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214 |
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215 | /*
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216 | * éä¿¡ãã¹ãã® IP ã¢ãã¬ã¹ãèªåã®å ´åã¯ãéè¤ãã¦ããã®ã§
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217 | * ç¸æã«ãç¥ãããã
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218 | */
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219 | if (saddr == ifp->in_ifaddr.addr) {
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220 |
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221 | #ifdef ARP_CFG_CALLBACK_DUPLICATED
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222 |
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223 | if (arp_callback_duplicated(et_arph->shost)) {
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224 | syslog(LOG_ERROR, "[ARP] IP address duplicated: %s", mac2str(NULL, et_arph->shost));
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225 | taddr = saddr;
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226 | goto reply;
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227 | }
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228 | else
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229 | goto buf_rel;
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230 |
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231 | #else /* of #ifdef ARP_CFG_CALLBACK_DUPLICATED */
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232 |
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233 | syslog(LOG_ERROR, "[ARP] IP address duplicated: %s", mac2str(NULL, et_arph->shost));
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234 | taddr = saddr;
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235 | goto reply;
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236 |
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237 | #endif /* of #ifdef ARP_CFG_CALLBACK_DUPLICATED */
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238 |
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239 | }
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240 |
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241 | /*
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242 | * 以ä¸ã®å ´åã¯ä½ãããªãã
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243 | * ã»è§£æ±ºå¯¾è±¡ IP ã¢ãã¬ã¹ãèªåã§ã¯ãªãã注: å
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244 | ã® FreeBSD ã®
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245 | * å®è£
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246 | ã§ã¯ãARP PROXY çã®ãããèªå以å¤ã® IP ã¢ãã¬ã¹ã®
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247 | * 解決ãè¡ã£ã¦ããããæ¬å®è£
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248 | ã§ã¯ãèªå以å¤ã® IP
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249 | * ã¢ãã¬ã¹ã®è§£æ±ºã¯è¡ããªãã
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250 | */
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251 | if (taddr != ifp->in_ifaddr.addr)
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252 | goto buf_rel;
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253 |
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254 | /*
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255 | * éä¿¡å
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256 | IP ã¢ãã¬ã¹ã ARP ãã£ãã·ã¥ã«ããã調ã¹ãã
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257 | * ãã£ãã·ã¥ã«ãªããã°ãæ°ãã«ã¨ã³ããªãç»é²ããã
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258 | */
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259 | syscall(wai_sem(SEM_ARP_CACHE_LOCK));
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260 | ent = arp_lookup(saddr, true);
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261 |
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262 | memcpy(ent->mac_addr, et_arph->shost, ETHER_ADDR_LEN);
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263 | ent->expire = ARP_CACHE_KEEP;
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264 |
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265 | /*
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266 | * éä¿¡ããã³ãã³ã°ããã¦ãããã¬ã¼ã ãããã°éä¿¡ããã
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267 | */
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268 | if (ent->hold) {
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269 |
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270 | /* ãã¬ã¼ã ã® Ethernet ããããè¨å®ããã*/
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271 | memcpy(GET_ETHER_HDR(ent->hold)->dhost, ent->mac_addr, ETHER_ADDR_LEN);
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272 |
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273 | pending = ent->hold;
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274 | ent->hold = NULL;
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275 | syscall(sig_sem(SEM_ARP_CACHE_LOCK));
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276 |
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277 | /* ãã³ãã£ã³ã°ããã¦ãããã¬ã¼ã ãéä¿¡ããã*/
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278 | IF_RAW_OUTPUT(pending, TMO_FEVR);
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279 |
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280 | }
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281 | else
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282 | syscall(sig_sem(SEM_ARP_CACHE_LOCK));
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283 |
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284 | reply:
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285 |
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286 | arph = GET_ARP_HDR(input);
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287 |
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288 | /* ã¢ãã¬ã¹è§£æ±ºè¦æ±ã§ãªããã°çµäº */
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289 | if (ntohs(arph->opcode) != ARPOP_REQUEST)
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290 | goto buf_rel;
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291 |
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292 | /* Ethernet ARP ããããè¨å®ããã*/
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293 | memcpy(et_arph->thost, et_arph->shost, ETHER_ADDR_LEN);
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294 | memcpy(et_arph->shost, ifaddr->lladdr, ETHER_ADDR_LEN);
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295 | memcpy(et_arph->tproto, (uint8_t*)&et_arph->sproto, sizeof(T_IN_ADDR));
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296 | ahtonl(et_arph->sproto, taddr);
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297 |
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298 | /* Ethernet ARP ããããè¨å®ããã*/
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299 | arph->opcode = htons(ARPOP_REPLY);
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300 |
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301 | /* Ethernet ããããè¨å®ããã*/
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302 | eth = GET_ETHER_HDR(input);
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303 | memcpy(eth->dhost, eth->shost, ETHER_ADDR_LEN);
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304 | memcpy(eth->shost, ifaddr->lladdr, ETHER_ADDR_LEN);
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305 |
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306 | /* ARP å¿çãéä¿¡ããã*/
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307 | IF_RAW_OUTPUT(input, TMO_FEVR);
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308 | return;
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309 |
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310 | err_ret:
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311 | NET_COUNT_ARP(net_count_arp.in_err_packets, 1);
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312 | buf_rel:
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313 | syscall(rel_net_buf(input));
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314 | }
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315 |
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316 | /*
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317 | * arp_timer -- ARP ãã£ãã·ã¥ã®æ´æ°
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318 | */
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319 |
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320 | static void
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321 | arp_timer (void *ignore)
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322 | {
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323 | int_t ix;
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324 |
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325 | syscall(wai_sem(SEM_ARP_CACHE_LOCK));
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326 |
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327 | for (ix = NUM_ARP_ENTRY; ix -- > 0; ) {
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328 | if (arp_cache[ix].expire) {
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329 | arp_cache[ix].expire -= ARP_TIMER_TMO;
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330 | if (arp_cache[ix].expire == 0) {
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331 | /* éä¿¡ããã³ãã³ã°ããã¦ãããã¬ã¼ã ãããã°æ¨ã¦ãã*/
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332 | if (arp_cache[ix].hold) {
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333 | NET_COUNT_IP4(net_count_ip4[NC_IP4_OUT_ERR_PACKETS], 1);
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334 | syscall(rel_net_buf(arp_cache[ix].hold));
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335 | }
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336 | memset(&arp_cache[ix], 0, sizeof(T_ARP_ENTRY));
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337 | }
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338 | }
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339 | }
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340 |
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341 | syscall(sig_sem(SEM_ARP_CACHE_LOCK));
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342 | timeout(arp_timer, NULL, ARP_TIMER_TMO);
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343 | }
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344 |
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345 | /*
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346 | * arp_request -- MAC ã¢ãã¬ã¹è§£æ±ºè¦æ±
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347 | */
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348 |
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349 | ER
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350 | arp_request (T_IF_ADDR *ifaddr, T_IN4_ADDR dst)
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351 | {
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352 | ER error;
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353 | T_IN4_ADDR src;
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354 | T_ETHER_HDR *eth;
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355 | T_ARP_HDR *arph;
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356 | T_ETHER_ARP_HDR *et_arph;
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357 | T_NET_BUF *arp_req;
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358 |
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359 | NET_COUNT_ARP(net_count_arp.out_octets , IF_ARP_ETHER_HDR_SIZE - IF_HDR_SIZE);
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360 | NET_COUNT_ARP(net_count_arp.out_packets, 1);
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361 |
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362 | if ((error = tget_net_buf(&arp_req, IF_ARP_ETHER_HDR_SIZE, TMO_ARP_GET_NET_BUF)) == E_OK) {
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363 |
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364 | /* ã¤ã¼ãµãããããããè¨å®ããã*/
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365 | eth = GET_ETHER_HDR(arp_req);
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366 | memcpy(eth->dhost, ether_broad_cast_addr, ETHER_ADDR_LEN);
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367 | memcpy(eth->shost, ifaddr->lladdr, ETHER_ADDR_LEN);
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368 | eth->type = htons(ETHER_TYPE_ARP);
|
---|
369 |
|
---|
370 | /* ARP ããããè¨å®ããã*/
|
---|
371 | arph = GET_ARP_HDR(arp_req);
|
---|
372 | arph->hrd_addr = htons(ARPHRD_ETHER);
|
---|
373 | arph->proto = htons(ETHER_TYPE_IP);
|
---|
374 | arph->hdr_len = sizeof(et_arph->shost);
|
---|
375 | arph->proto_len = sizeof(et_arph->sproto);
|
---|
376 | arph->opcode = htons(ARPOP_REQUEST);
|
---|
377 |
|
---|
378 | /* ã¤ã¼ãµããã ARP ããããè¨å®ããã*/
|
---|
379 | et_arph = GET_ETHER_ARP_HDR(arp_req);
|
---|
380 | src = IF_GET_IFNET()->in_ifaddr.addr;
|
---|
381 | memcpy(et_arph->shost, ifaddr->lladdr, ETHER_ADDR_LEN);
|
---|
382 | memset(et_arph->thost, 0, ETHER_ADDR_LEN);
|
---|
383 | ahtonl(et_arph->sproto, src);
|
---|
384 | ahtonl(et_arph->tproto, dst);
|
---|
385 |
|
---|
386 | /* éä¿¡ããã*/
|
---|
387 | error = IF_RAW_OUTPUT(arp_req, TMO_ARP_OUTPUT);
|
---|
388 | }
|
---|
389 | if (error != E_OK)
|
---|
390 | NET_COUNT_ARP(net_count_arp.out_err_packets, 1);
|
---|
391 | return error;
|
---|
392 | }
|
---|
393 |
|
---|
394 | /*
|
---|
395 | * arp_get_cache -- ARP ãã£ãã·ã¥ãç²å¾ããã
|
---|
396 | */
|
---|
397 |
|
---|
398 | const T_ARP_ENTRY *
|
---|
399 | arp_get_cache (void)
|
---|
400 | {
|
---|
401 | return arp_cache;
|
---|
402 | }
|
---|
403 |
|
---|
404 | /*
|
---|
405 | * arp_input -- ARP ã®å
|
---|
406 | ¥åé¢æ°
|
---|
407 | */
|
---|
408 |
|
---|
409 | void
|
---|
410 | arp_input (T_IF_ADDR *ifaddr, T_NET_BUF *input)
|
---|
411 | {
|
---|
412 | T_ARP_HDR *arph;
|
---|
413 |
|
---|
414 | NET_COUNT_ARP(net_count_arp.in_octets , input->len - IF_HDR_SIZE);
|
---|
415 | NET_COUNT_ARP(net_count_arp.in_packets, 1);
|
---|
416 |
|
---|
417 | /* ARP ãããã®é·ãããã§ãã¯ããã*/
|
---|
418 | if (input->len < IF_ARP_HDR_SIZE)
|
---|
419 | goto buf_rel;
|
---|
420 |
|
---|
421 | arph = GET_ARP_HDR(input);
|
---|
422 |
|
---|
423 | /*
|
---|
424 | * ç©çã¢ãã¬ã¹ãã©ã¼ãããã Ehternet 以å¤
|
---|
425 | * ã¾ãã¯ããããã³ã«ã IP 以å¤ã¯ã¨ã©ã¼ã
|
---|
426 | */
|
---|
427 | if (ntohs(arph->hrd_addr) != ARPHRD_ETHER ||
|
---|
428 | ntohs(arph->proto) != ETHER_TYPE_IP)
|
---|
429 | goto buf_rel;
|
---|
430 |
|
---|
431 | /* ARP ããã + Ether ARP ãããã®é·ãããã§ãã¯ããã*/
|
---|
432 | if (input->len < IF_ARP_ETHER_HDR_SIZE)
|
---|
433 | goto buf_rel;
|
---|
434 |
|
---|
435 | in_arpinput(ifaddr, input);
|
---|
436 | return;
|
---|
437 |
|
---|
438 | buf_rel:
|
---|
439 | NET_COUNT_ARP(net_count_arp.in_err_packets, 1);
|
---|
440 | syscall(rel_net_buf(input));
|
---|
441 | }
|
---|
442 |
|
---|
443 | /*
|
---|
444 | * arp_resolve -- MAC ã¢ãã¬ã¹è§£æ±º
|
---|
445 | *
|
---|
446 | * ã¢ãã¬ã¹è§£æ±ºãã§ããã°ãæ»ãå¤ã¯ true ãè¿ããã§ããªããã°
|
---|
447 | * éä¿¡ããã³ãã£ã³ã°ãã¦ãæ»ãå¤ã¯ false ãè¿ãã
|
---|
448 | */
|
---|
449 |
|
---|
450 | bool_t
|
---|
451 | arp_resolve (T_IF_ADDR *ifaddr, T_NET_BUF *output, T_IN4_ADDR gw)
|
---|
452 | {
|
---|
453 | T_ARP_ENTRY *ent;
|
---|
454 | T_ETHER_HDR *eth;
|
---|
455 | T_IFNET *ifp = IF_GET_IFNET();
|
---|
456 |
|
---|
457 | eth = GET_ETHER_HDR(output);
|
---|
458 |
|
---|
459 | /*
|
---|
460 | * 次ã®å ´åã¯ãã¤ã¼ãµãããã®ããã¼ããã£ã¹ãã¢ãã¬ã¹ãè¿ãã
|
---|
461 | *
|
---|
462 | * ã»å
|
---|
463 | ¨ãããã 1
|
---|
464 | * ã»ãã¹ãé¨ã®å
|
---|
465 | ¨ãããã 1 ã§ããããã¯ã¼ã¯é¨ããã¼ã«ã«ã¢ãã¬ã¹
|
---|
466 | */
|
---|
467 | if (gw == IPV4_ADDR_BROADCAST ||
|
---|
468 | gw == ((ifp->in_ifaddr.addr & ifp->in_ifaddr.mask) | ~ifp->in_ifaddr.mask)) {
|
---|
469 | memcpy(eth->dhost, ether_broad_cast_addr, ETHER_ADDR_LEN);
|
---|
470 | return true;
|
---|
471 | }
|
---|
472 |
|
---|
473 | /* éä¿¡å
|
---|
474 | GW ã® IP ã¢ãã¬ã¹ã ARP ãã£ãã·ã¥ã«ããã調ã¹ãã*/
|
---|
475 | syscall(wai_sem(SEM_ARP_CACHE_LOCK));
|
---|
476 | ent = arp_lookup(gw, true);
|
---|
477 | if (ent->expire) {
|
---|
478 | memcpy(eth->dhost, ent->mac_addr, ETHER_ADDR_LEN);
|
---|
479 | syscall(sig_sem(SEM_ARP_CACHE_LOCK));
|
---|
480 | return true;
|
---|
481 | }
|
---|
482 | else {
|
---|
483 | /* éä¿¡ããã³ãã³ã°ããã¦ãããã¬ã¼ã ãããã°æ¨ã¦ãã*/
|
---|
484 | if (ent->hold) {
|
---|
485 | NET_COUNT_IP4(net_count_ip4[NC_IP4_OUT_ERR_PACKETS], 1);
|
---|
486 | syscall(rel_net_buf(ent->hold));
|
---|
487 | }
|
---|
488 |
|
---|
489 | /*
|
---|
490 | * éä¿¡ããã³ãã£ã³ã°ããã
|
---|
491 | * IF ã§ãããã¯ã¼ã¯ãããã¡ãéæ¾ããªããã©ã°ãè¨å®ããã¦ããã¨ãã¯ã
|
---|
492 | * éä¿¡ããã³ãã£ã³ã°ããªãã
|
---|
493 | */
|
---|
494 | if ((output->flags & NB_FLG_NOREL_IFOUT) == 0)
|
---|
495 | ent->hold = output;
|
---|
496 | else {
|
---|
497 | output->flags &= (uint8_t)~NB_FLG_NOREL_IFOUT;
|
---|
498 | ent->hold = NULL;
|
---|
499 | }
|
---|
500 | syscall(sig_sem(SEM_ARP_CACHE_LOCK));
|
---|
501 |
|
---|
502 | /* ã¢ãã¬ã¹è§£æ±ºè¦æ±ãéä¿¡ããã*/
|
---|
503 | arp_request(ifaddr, gw);
|
---|
504 | return false;
|
---|
505 | }
|
---|
506 | }
|
---|
507 |
|
---|
508 | /*
|
---|
509 | * arp_init -- ARP åæå
|
---|
510 | */
|
---|
511 |
|
---|
512 | void
|
---|
513 | arp_init (void)
|
---|
514 | {
|
---|
515 | timeout(arp_timer, NULL, ARP_TIMER_TMO);
|
---|
516 | }
|
---|
517 |
|
---|
518 | #ifdef ETHER_CFG_MULTICAST
|
---|
519 | /*
|
---|
520 | * ether_map_ipv4_multicast -- IPv4 ãã«ããã£ã¹ãã¢ãã¬ã¹ããã¤ã¼ãµãããã»ãã«ããã£ã¹ãã¢ãã¬ã¹ã¸ã®å¤æ
|
---|
521 | */
|
---|
522 |
|
---|
523 | void
|
---|
524 | ether_map_ipv4_multicast (T_ETHER_ADDR *eaddr, T_IN4_ADDR maddr)
|
---|
525 | {
|
---|
526 | eaddr->lladdr[0] = UINT_C(0x01);
|
---|
527 | eaddr->lladdr[1] = UINT_C(0x00);
|
---|
528 | eaddr->lladdr[2] = UINT_C(0x5E);
|
---|
529 | eaddr->lladdr[3] = (maddr & 0x7F0000) >> 16;
|
---|
530 | eaddr->lladdr[4] = (maddr & 0xFF00) >> 8;
|
---|
531 | eaddr->lladdr[5] = maddr & 0xFF;
|
---|
532 | }
|
---|
533 | #endif /* ETHER_CFG_MULTICAST */
|
---|
534 |
|
---|
535 | #endif /* of #if defined(SUPPORT_INET4) && defined(SUPPORT_ETHER) */
|
---|