1 | /*
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2 | * TINET (TCP/IP Protocol Stack)
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3 | *
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4 | * Copyright (C) 2001-2017 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: nd6.c 388 2019-05-22 11:25:18Z coas-nagasima $
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44 | */
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45 |
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46 | /* $FreeBSD: src/sys/netinet6/nd6.c,v 1.20 2002/08/02 20:49:14 rwatson Exp $ */
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47 | /* $KAME: nd6.c,v 1.144 2001/05/24 07:44:00 itojun Exp $ */
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48 |
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49 | /*
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50 | * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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51 | * All rights reserved.
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52 | *
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53 | * Redistribution and use in source and binary forms, with or without
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54 | * modification, are permitted provided that the following conditions
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55 | * are met:
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56 | * 1. Redistributions of source code must retain the above copyright
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57 | * notice, this list of conditions and the following disclaimer.
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58 | * 2. Redistributions in binary form must reproduce the above copyright
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59 | * notice, this list of conditions and the following disclaimer in the
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60 | * documentation and/or other materials provided with the distribution.
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61 | * 3. Neither the name of the project nor the names of its contributors
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62 | * may be used to endorse or promote products derived from this software
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63 | * without specific prior written permission.
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64 | *
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65 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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66 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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67 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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68 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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69 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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70 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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71 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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72 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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73 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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74 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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75 | * SUCH DAMAGE.
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76 | */
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77 |
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78 | /*
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79 | * XXX
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80 | * KAME 970409 note:
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81 | * BSD/OS version heavily modifies this code, related to llinfo.
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82 | * Since we don't have BSD/OS version of net/route.c in our hand,
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83 | * I left the code mostly as it was in 970310. -- itojun
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84 | */
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85 |
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86 | #include <string.h>
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87 |
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88 | #ifdef TARGET_KERNEL_ASP
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89 |
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90 | #include <kernel.h>
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91 | #include <sil.h>
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92 | #include "kernel_cfg.h"
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93 |
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94 | #endif /* of #ifdef TARGET_KERNEL_ASP */
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95 |
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96 | #ifdef TARGET_KERNEL_JSP
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97 |
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98 | #include <s_services.h>
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99 | #include <t_services.h>
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100 | #include "kernel_id.h"
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101 |
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102 | #endif /* of #ifdef TARGET_KERNEL_JSP */
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103 |
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104 | #include <tinet_defs.h>
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105 | #include <tinet_config.h>
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106 |
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107 | #include <net/if.h>
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108 | #include <net/if_loop.h>
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109 | #include <net/if_ppp.h>
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110 | #include <net/ethernet.h>
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111 | #include <net/if_arp.h>
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112 | #include <net/ppp.h>
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113 | #include <net/ppp_ipcp.h>
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114 | #include <net/net.h>
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115 | #include <net/net_endian.h>
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116 | #include <net/net_var.h>
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117 | #include <net/net_buf.h>
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118 | #include <net/net_timer.h>
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119 | #include <net/net_count.h>
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120 |
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121 | #include <netinet/in.h>
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122 | #include <netinet/in_var.h>
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123 | #include <netinet/ip.h>
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124 | #include <netinet/ip_var.h>
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125 | #include <netinet/ip_icmp.h>
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126 |
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127 | #include <netinet6/nd6.h>
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128 |
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129 | #include <net/if_var.h>
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130 |
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131 | #ifdef _IP6_CFG
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132 |
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133 | /*
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134 | * è¿é£ãã£ãã·ã¥
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135 | */
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136 |
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137 | static T_LLINFO_ND6 nd6_cache[NUM_ND6_CACHE_ENTRY];
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138 |
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139 | /*
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140 | * nd6_free -- ã«ã¼ã¿ãåé¤ããã
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141 | */
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142 |
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143 | static void
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144 | nd6_free (T_LLINFO_ND6 *ln)
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145 | {
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146 | T_DEF_ROUTER *dr;
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147 |
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148 | dr = nd6_defrtrlist_lookup(&ln->addr);
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149 | if (dr != NULL) {
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150 | ln->state = ND6_LLINFO_INCOMPLETE;
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151 |
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152 | /* ãã¬ãã£ãã¯ã¹ã»ãªã¹ãããã«ã¼ã¿ãåé¤ããã*/
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153 | nd6_defrtrlist_del(dr);
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154 | }
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155 | }
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156 |
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157 | /*
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158 | * nd6_timer -- è¿é£æ¢ç´¢ç®¡çã¿ã¤ãã¼
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159 | */
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160 |
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161 | void
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162 | nd6_timer (void)
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163 | {
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164 | T_IFNET *ifp = IF_GET_IFNET();
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165 | T_LLINFO_ND6 *ln;
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166 | SYSTIM now;
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167 | int_t ix;
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168 |
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169 | /* è¿é£ãã£ãã·ã¥ã®å¦ç */
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170 | syscall(wai_sem(SEM_ND6_CACHE));
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171 | syscall(get_tim(&now));
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172 | for (ix = NUM_ND6_CACHE_ENTRY; ix -- > 0; ) {
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173 | ln = &nd6_cache[ix];
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174 | if (ln->state >= ND6_LLINFO_NO_STATE && (int32_t)(ln->expire - now) < 0) {
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175 | /* ln->expire < now */
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176 |
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177 | switch (ln->state) {
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178 |
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179 | case ND6_LLINFO_INCOMPLETE: /* æªè§£æ±º */
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180 | if (ln->asked < ND6_MAX_MCAST_QUERY) {
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181 | /*
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182 | * ãã«ããã£ã¹ãã¢ãã¬ã¹è¦è«ã®åéåæ°ä»¥ä¸ã®å ´åã®å¦ç
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183 | */
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184 | ln->asked ++;
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185 | ln->expire = now + ND6_RETRANS_TIME; /* è¿é£æ¢ç´¢éä¿¡éé */
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186 | nd6_ns_output(ifp, &in6_addr_unspecified, &ln->addr, ln, false);
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187 | }
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188 | else {
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189 | if (ln->hold != NULL) {
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190 | /*
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191 | * æçµçã«ã¯ãä¿çããã¦ãããããã¯ã¼ã¯ãããã¡ã
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192 | * ããã°ãICMP6 ERROR ãèªåèªèº«ã«è¿ãããã¨ã
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193 | * ãããã¯ã¼ã¯ãããã¡ãéæ¾ããã
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194 | * ããããç¾å¨ãicmp6_error ã®å®è£
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195 | ãä¸å®å
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196 | ¨ã®ããã
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197 | * ãããã¯ã¼ã¯ãããã¡ã®éæ¾ã®ã¿è¡ãã
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198 | */
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199 | #if 0 /* ä¿ç */
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200 | icmp6_error(ln->hold, ICMP6_DST_UNREACH,
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201 | ICMP6_DST_UNREACH_ADDR, 0);
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202 | #endif /* #if 0 */
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203 | syscall(rel_net_buf(ln->hold));
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204 | ln->hold = NULL;
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205 | }
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206 | nd6_free(ln);
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207 | memset((void*)ln, 0, sizeof(*ln));
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208 | }
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209 | break;
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210 |
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211 | case ND6_LLINFO_REACHABLE: /* å°éå¯è½ */
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212 | if (ln->expire) {
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213 | ln->expire = now + ND6_GCOLLECTION_TIME;
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214 | ln->state = ND6_LLINFO_STALE;
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215 | }
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216 | break;
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217 |
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218 | case ND6_LLINFO_STALE: /* å°éå¯è½æ§ã¯æªç¢ºèª */
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219 | if (ln->expire) {
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220 | if (ln->hold != NULL) {
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221 | syscall(rel_net_buf(ln->hold));
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222 | ln->hold = NULL;
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223 | }
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224 | nd6_free(ln);
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225 | memset((void*)ln, 0, sizeof(*ln));
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226 | }
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227 | break;
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228 |
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229 | case ND6_LLINFO_DELAY: /* å°éå¯è½æ§ã®ç¢ºèªå¾
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230 | æ© */
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231 | ln->asked = 1;
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232 | ln->expire = now + ND6_RETRANS_TIME; /* è¿é£æ¢ç´¢éä¿¡éé */
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233 | ln->state = ND6_LLINFO_PROBE;
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234 | nd6_ns_output(ifp, &ln->addr, &ln->addr, ln, false);
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235 | break;
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236 |
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237 | case ND6_LLINFO_PROBE: /* å°éå¯è½æ§ã確èªä¸ */
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238 | if (ln->asked < ND6_MAX_UCAST_QUERY) {
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239 | /*
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240 | * ã¦ããã£ã¹ãã¢ãã¬ã¹è¦è«ã®åéåæ°ä»¥ä¸ã®å ´åã®å¦ç
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241 | */
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242 | ln->asked ++;
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243 | ln->expire += ND6_RETRANS_TIME; /* è¿é£æ¢ç´¢éä¿¡éé */
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244 | nd6_ns_output(ifp, &ln->addr, &ln->addr, ln, false);
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245 | }
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246 | else {
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247 | if (ln->hold != NULL) {
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248 | syscall(rel_net_buf(ln->hold));
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249 | ln->hold = NULL;
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250 | }
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251 | nd6_free(ln);
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252 | memset((void*)ln, 0, sizeof(*ln));
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253 | }
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254 | break;
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255 |
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256 | }
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257 | }
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258 | }
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259 | syscall(sig_sem(SEM_ND6_CACHE));
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260 |
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261 | /* ãã£ãã©ã«ãã«ã¼ã¿ã»ãªã¹ãã®å¦ç */
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262 | nd6_defrtrlist_timer();
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263 |
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264 | /* ãã¬ãã£ãã¯ã¹ã»ãªã¹ãã®å¦ç */
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265 | nd6_prelist_timer();
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266 |
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267 | /* ãããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ã®ã¢ãã¬ã¹ã®å¦ç */
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268 | in6_ifaddr_timer(ifp);
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269 |
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270 | /*
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271 | * å°éå¯è½ç¶æ
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272 | ã®æå¹æéã®æ´æ°
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273 | */
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274 | if ((int32_t)(nd6_recalc_reachtm_interval - now) < 0) {
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275 | /* nd6_recalc_reachtm_interval < now */
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276 | nd6_recalc_reachtm_interval = now + ND6_RECALC_REACHTM_INTERVAL;
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277 | nd6_reachable_time = ND6_CALC_REACH_TIME(nd6_base_reachable_time);
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278 | }
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279 | timeout((callout_func)nd6_timer, NULL, ND6_TIMER_TMO);
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280 | }
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281 |
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282 | /*
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283 | * nd6_get_cache -- è¿é£ãã£ãã·ã¥ãç²å¾ããã
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284 | */
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285 |
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286 | const T_LLINFO_ND6 *
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287 | nd6_get_cache (void)
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288 | {
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289 | return nd6_cache;
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290 | }
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291 |
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292 | /*
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293 | * nd6_ifattach -- è¿é£æ¢ç´¢ã®åæè¨å®ãè¡ãã
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294 | */
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295 |
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296 | void
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297 | nd6_ifattach (T_IFNET *ifp)
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298 | {
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299 | }
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300 |
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301 | /*
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302 | * nd6_output_hold -- è¿é£æ¢ç´¢ãã£ãã·ã¥ã«ä¿çããã¦ãã
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303 | * ã¢ãã¬ã¹è§£æ±ºå¾
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304 | ã¡ã®ãã¼ã¿ã°ã©ã ãããã°éä¿¡ããã
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305 | *
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306 | * 注æ: ã»ããã© SEM_ND6_CACHE ã«ããããã¯ç¶æ
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307 | ã§å¼åºããã¨ã
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308 | */
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309 |
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310 | ER
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311 | nd6_output_hold (T_IFNET *ifp, T_LLINFO_ND6 *ln)
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312 | {
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313 | SYSTIM now;
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314 |
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315 | /* ã¢ãã¬ã¹è§£æ±ºå¾
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316 | ã¡ã®ãã¼ã¿ã°ã©ã ãããã°éä¿¡ããã*/
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317 | if (ln->hold) {
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318 |
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319 | /* ã¿ã¤ã ã¢ã¦ãã®å¦ç */
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320 | if (ln->tmout != TMO_FEVR) {
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321 |
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322 | /*
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323 | * ã¿ã¤ã ã¢ã¦ãã®æå®ãæ°¸ä¹
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324 | ã§ãªããæéãéãã¦ããã°ã
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325 | * åºåããªãã§çµäºããã
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326 | */
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327 | syscall(get_tim(&now));
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328 | if ((int32_t)(ln->tmout - now) < 0) {
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329 | /* ln->tmout < now */
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330 | syscall(rel_net_buf(ln->hold));
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331 | ln->hold = NULL;
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332 | return E_TMOUT;
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333 | }
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334 | }
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335 |
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336 | nd6_output(ifp, ln->hold, &ln->addr, ln, TMO_FEVR);
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337 | ln->hold = NULL;
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338 | }
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339 | return E_OK;
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340 | }
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341 |
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342 | /*
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343 | * nd6_lookup -- è¿é£æ¢ç´¢ãã£ãã·ã¥ãæ¢ç´¢ããã
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344 | *
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345 | * 注æ: ã»ããã© SEM_ND6_CACHE ã«ããããã¯ç¶æ
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346 | ã§å¼åºããã¨ã
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347 | *
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348 | */
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349 |
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350 | T_LLINFO_ND6 *
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351 | nd6_lookup (const T_IN6_ADDR *addr, bool_t create)
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352 | {
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353 | SYSTIM min = 0xffffffff;
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354 | int_t ix, fix = -1, mix = -1;
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355 |
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356 | for (ix = NUM_ND6_CACHE_ENTRY; ix -- > 0; ) {
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357 | if (nd6_cache[ix].state == 0) {
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358 | /* æªä½¿ç¨ã¨ã³ããªã®ã¤ã³ããã¯ã¹ãè¨é²ããã*/
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359 | if (fix == -1)
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360 | fix = ix;
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361 | }
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362 | else if (IN6_ARE_ADDR_EQUAL(addr, &nd6_cache[ix].addr)) {
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363 | return &nd6_cache[ix];
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364 | }
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365 | else if ((int32_t)(nd6_cache[ix].expire - min) < 0) { /* nd6_cache[ix].expire < min */
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366 | /* æå¹æéãæçã¨ã³ããªã®ã¤ã³ããã¯ã¹ãè¨é²ããã*/
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367 | min = nd6_cache[ix].expire;
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368 | mix = ix;
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369 | }
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370 | }
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371 |
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372 | if (create) {
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373 | if (fix == -1) {
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374 | if (nd6_cache[mix].hold != NULL) {
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375 | syscall(rel_net_buf(nd6_cache[mix].hold));
|
---|
376 | nd6_cache[mix].hold = NULL;
|
---|
377 | }
|
---|
378 | fix = mix;
|
---|
379 | }
|
---|
380 | syscall(get_tim(&nd6_cache[fix].expire));
|
---|
381 | nd6_cache[fix].addr = *addr;
|
---|
382 | nd6_cache[fix].state = ND6_LLINFO_NO_STATE;
|
---|
383 | return &nd6_cache[fix];
|
---|
384 | }
|
---|
385 | else
|
---|
386 | return NULL;
|
---|
387 | }
|
---|
388 |
|
---|
389 | /*
|
---|
390 | * nd6_cache_lladdr -- è¿é£æ¢ç´¢ãã£ãã·ã¥ã«ç»é²ããã
|
---|
391 | */
|
---|
392 |
|
---|
393 | T_LLINFO_ND6 *
|
---|
394 | nd6_cache_lladdr (T_IFNET *ifp, const T_IN6_ADDR *from,
|
---|
395 | T_IF_ADDR *lladdr, uint8_t type, uint8_t code)
|
---|
396 | {
|
---|
397 | T_LLINFO_ND6 *ln;
|
---|
398 | SYSTIM now;
|
---|
399 | bool_t newentry, olladdr, llchange, doupdate;
|
---|
400 | int_t newstate = ND6_LLINFO_INCOMPLETE;
|
---|
401 |
|
---|
402 | /* ã¢ãã¬ã¹ãç¡æå®ãªãä½ãããªãã*/
|
---|
403 | if (IN6_IS_ADDR_UNSPECIFIED(from))
|
---|
404 | return NULL;
|
---|
405 |
|
---|
406 | /* è¿é£ãã£ãã·ã¥ã«ç»é²ããã*/
|
---|
407 | syscall(wai_sem(SEM_ND6_CACHE));
|
---|
408 | if ((ln = nd6_lookup(from, false)) == NULL) {
|
---|
409 | ln = nd6_lookup(from, true);
|
---|
410 | newentry = true;
|
---|
411 | }
|
---|
412 | else
|
---|
413 | newentry = false;
|
---|
414 |
|
---|
415 | olladdr = ln->state > ND6_LLINFO_INCOMPLETE;
|
---|
416 | if (!olladdr || lladdr == NULL)
|
---|
417 | llchange = false;
|
---|
418 | else if (memcmp(lladdr, &ln->ifaddr, sizeof(T_IF_ADDR)))
|
---|
419 | llchange = true;
|
---|
420 | else
|
---|
421 | llchange = false;
|
---|
422 |
|
---|
423 | /*
|
---|
424 | * ç¶æ
|
---|
425 | é·ç§»è¡¨
|
---|
426 | *
|
---|
427 | * nd_na_flags
|
---|
428 | * newnetry olladdr lladdr llchange å¦ç (L: lladdr ãç»é²ãã)
|
---|
429 | *
|
---|
430 | * F F N - (1)
|
---|
431 | * F T N - (2)
|
---|
432 | * F F Y - (3) L * -> STALE
|
---|
433 | * F T Y F (4) L
|
---|
434 | * F T Y T (5) L * -> STALE
|
---|
435 | * T - N - (6) * -> NO_STATE
|
---|
436 | * T - Y - (7) L * -> STALE
|
---|
437 | */
|
---|
438 |
|
---|
439 | /* ãã¼ã¿ãªã³ã¯å±¤ã®ã¢ãã¬ã¹ãéç¥ããã¦ããã°æ´æ°ããã*/
|
---|
440 | if (lladdr != NULL) {
|
---|
441 | ln->ifaddr = *(T_IF_ADDR *)lladdr;
|
---|
442 | }
|
---|
443 |
|
---|
444 | if (newentry) {
|
---|
445 | if (lladdr != NULL) /* (7) */
|
---|
446 | newstate = ND6_LLINFO_STALE;
|
---|
447 | else /* (6) */
|
---|
448 | newstate = ND6_LLINFO_NO_STATE;
|
---|
449 | doupdate = true;
|
---|
450 | }
|
---|
451 | else {
|
---|
452 | if ((!olladdr && lladdr != NULL) || /* (3) */
|
---|
453 | ( olladdr && lladdr != NULL && llchange)) { /* (5) */
|
---|
454 | newstate = ND6_LLINFO_STALE;
|
---|
455 | doupdate = true;
|
---|
456 | }
|
---|
457 | else /* (1),(2),(4) */
|
---|
458 | doupdate = false;
|
---|
459 | }
|
---|
460 |
|
---|
461 | /* è¿é£ãã£ãã·ã¥ã¨ã³ããªãæ´æ°ããã*/
|
---|
462 | if (doupdate) {
|
---|
463 | ln->state = newstate;
|
---|
464 |
|
---|
465 | syscall(get_tim(&now));
|
---|
466 | if (ln->state == ND6_LLINFO_STALE) {
|
---|
467 | ln->expire = now + ND6_GCOLLECTION_TIME;
|
---|
468 |
|
---|
469 | /* ã¢ãã¬ã¹è§£æ±ºå¾
|
---|
470 | ã¡ã®ãã¼ã¿ã°ã©ã ãããã°éä¿¡ããã*/
|
---|
471 | nd6_output_hold(ifp, ln);
|
---|
472 | }
|
---|
473 | else if (ln->state == ND6_LLINFO_INCOMPLETE)
|
---|
474 | ln->expire = now;
|
---|
475 | }
|
---|
476 | syscall(sig_sem(SEM_ND6_CACHE));
|
---|
477 |
|
---|
478 |
|
---|
479 | /* ã«ã¼ã¿éç¥ã®å¦ç */
|
---|
480 | switch (type) {
|
---|
481 |
|
---|
482 | case ND_NEIGHBOR_SOLICIT:
|
---|
483 | if (newentry)
|
---|
484 | ln->flags &= ~ND6_LLIF_ROUTER;
|
---|
485 | break;
|
---|
486 |
|
---|
487 | case ND_REDIRECT:
|
---|
488 | if (code == ND_REDIRECT_ROUTER)
|
---|
489 | ln->flags |= ND6_LLIF_ROUTER;
|
---|
490 | else if (newentry)
|
---|
491 | ln->flags &= ~ND6_LLIF_ROUTER;
|
---|
492 | break;
|
---|
493 |
|
---|
494 | case ND_ROUTER_SOLICIT:
|
---|
495 | ln->flags &= ~ND6_LLIF_ROUTER;
|
---|
496 | break;
|
---|
497 |
|
---|
498 | case ND_ROUTER_ADVERT:
|
---|
499 | if ((!newentry && (olladdr || lladdr != NULL)) ||
|
---|
500 | ( newentry && lladdr))
|
---|
501 | ln->flags |= ND6_LLIF_ROUTER;
|
---|
502 | break;
|
---|
503 | }
|
---|
504 |
|
---|
505 | return ln;
|
---|
506 | }
|
---|
507 |
|
---|
508 | /*
|
---|
509 | * nd6_is_addr_neighbor -- æå®ãããã¢ãã¬ã¹ã®ãã¼ããåä¸ãªã³ã¯ã«ããããã§ãã¯ããã
|
---|
510 | */
|
---|
511 |
|
---|
512 | bool_t
|
---|
513 | nd6_is_addr_neighbor (T_IFNET *ifp, const T_IN6_ADDR *addr)
|
---|
514 | {
|
---|
515 | if (IN6_IS_ADDR_LINKLOCAL(addr))
|
---|
516 | return true;
|
---|
517 |
|
---|
518 | if (nd6_onlink_prefix_lookup(addr) != NULL)
|
---|
519 | return true;
|
---|
520 |
|
---|
521 | if (nd6_lookup(addr, false) != NULL)
|
---|
522 | return true;
|
---|
523 |
|
---|
524 | return false;
|
---|
525 | }
|
---|
526 |
|
---|
527 | /*
|
---|
528 | * nd6_output -- è¿é£æ¢ç´¢ã®åºåé¢æ°
|
---|
529 | *
|
---|
530 | * 注æ: ã»ããã© SEM_ND6_CACHE ã«ããããã¯ç¶æ
|
---|
531 | ã§å¼åºããã¨ã
|
---|
532 | */
|
---|
533 |
|
---|
534 | ER
|
---|
535 | nd6_output (T_IFNET *ifp, T_NET_BUF *output, const T_IN6_ADDR *dst, T_LLINFO_ND6 *ln, TMO tmout)
|
---|
536 | {
|
---|
537 | ER error = E_OK;
|
---|
538 | SYSTIM now;
|
---|
539 |
|
---|
540 | /*
|
---|
541 | * ãã¦å
|
---|
542 | ã¢ãã¬ã¹ããã«ããã£ã¹ãããè¿é£ãã£ãã·ã¥ã
|
---|
543 | * ä¸è¦ã®å ´åã¯ç´ã¡ã«éä¿¡ããã
|
---|
544 | */
|
---|
545 | if (!(IN6_IS_ADDR_MULTICAST(dst) || !IF_IN6_NEED_CACHE(ifp))) {
|
---|
546 | if (ln == NULL) {
|
---|
547 | /* è¿é£ãã£ãã·ã¥ãæªå®ç¾©ã®å ´å */
|
---|
548 | if (nd6_is_addr_neighbor(ifp, dst)) {
|
---|
549 | /*
|
---|
550 | * æå®ãããã¢ãã¬ã¹ã®ãã¼ããåä¸ãªã³ã¯ã«ããæã¯ã
|
---|
551 | * è¿é£ãã£ãã·ã¥ãæ¢ç´¢ããæªå®ç¾©ã®å ´åã¯ç»é²ããã
|
---|
552 | */
|
---|
553 | ln = nd6_lookup(dst, true);
|
---|
554 | }
|
---|
555 | else {
|
---|
556 | error = E_CLS;
|
---|
557 | goto err_ret;
|
---|
558 | }
|
---|
559 | }
|
---|
560 |
|
---|
561 | /*
|
---|
562 | * è¿é£ãã£ãã·ã¥ã®ç¶æ
|
---|
563 | ãããã¼ã¿ãªã³ã¯å±¤ã®ã¢ãã¬ã¹ãåãã£ã¦ãã¦ãã
|
---|
564 | * å°éå¯è½æ§ã確èªããã¦ããªãã¨ãã¯ãå°éä¸è½éç¥ãéå§ããã
|
---|
565 | */
|
---|
566 | if (ln->state == ND6_LLINFO_STALE) {
|
---|
567 | syscall(get_tim(&now));
|
---|
568 | ln->expire = now + ND6_DELAY_TIME;
|
---|
569 | ln->asked = 0;
|
---|
570 | ln->state = ND6_LLINFO_DELAY;
|
---|
571 | }
|
---|
572 |
|
---|
573 | /*
|
---|
574 | * è¿é£ãã£ãã·ã¥ã®ç¶æ
|
---|
575 | ãããã¼ã¿ãªã³ã¯å±¤ã®ã¢ãã¬ã¹æªè§£æ±ºã®å ´åã¯
|
---|
576 | * è¿é£æ¢ç´¢ãè¡ãã
|
---|
577 | */
|
---|
578 | if (ln->state <= ND6_LLINFO_INCOMPLETE) {
|
---|
579 |
|
---|
580 | /* ã¿ã¤ã ã¢ã¦ãã®æå®ããã¼ãªã³ã°ãªãã¿ã¤ã ã¢ã¦ãã§çµäºããã*/
|
---|
581 | if (tmout == TMO_POL) {
|
---|
582 | error = E_TMOUT;
|
---|
583 | goto err_ret;
|
---|
584 | }
|
---|
585 |
|
---|
586 | if (ln->state == ND6_LLINFO_NO_STATE)
|
---|
587 | ln->state = ND6_LLINFO_INCOMPLETE;
|
---|
588 |
|
---|
589 | /* ãã§ã«ãæªè§£æ±ºã®ãããã¯ã¼ã¯ãããã¡ãããã°ãéæ¾ããã*/
|
---|
590 | if (ln->hold != NULL) {
|
---|
591 | syscall(rel_net_buf(ln->hold));
|
---|
592 | ln->hold = NULL;
|
---|
593 | }
|
---|
594 |
|
---|
595 | /*
|
---|
596 | * éä¿¡ããã³ãã£ã³ã°ããã
|
---|
597 | * IF ã§ãããã¯ã¼ã¯ãããã¡ãéæ¾ããªããã©ã°ãè¨å®ããã¦ããã¨ãã¯ã
|
---|
598 | * éä¿¡ããã³ãã£ã³ã°ããªãã
|
---|
599 | */
|
---|
600 | if ((output->flags & NB_FLG_NOREL_IFOUT) == 0) {
|
---|
601 | ln->hold = output;
|
---|
602 |
|
---|
603 | /* ã¿ã¤ã ã¢ã¦ãã®è¨å® */
|
---|
604 | if (tmout == TMO_FEVR)
|
---|
605 | ln->tmout = tmout;
|
---|
606 | else {
|
---|
607 | syscall(get_tim(&now));
|
---|
608 | ln->tmout = now + tmout;
|
---|
609 | }
|
---|
610 | }
|
---|
611 | else {
|
---|
612 | output->flags &= ~NB_FLG_NOREL_IFOUT;
|
---|
613 | syscall(get_tim(&now));
|
---|
614 | ln->tmout = now + tmout;
|
---|
615 | }
|
---|
616 |
|
---|
617 | if (ln->expire) {
|
---|
618 | if (ln->asked < ND6_MAX_MCAST_QUERY) {
|
---|
619 | syscall(get_tim(&now));
|
---|
620 | if ((int32_t)(ln->expire - now) < 0) {
|
---|
621 | /* ln->expire < now */
|
---|
622 | ln->expire += ND6_RETRANS_TIME; /* è¿é£æ¢ç´¢éä¿¡éé */
|
---|
623 | ln->asked ++;
|
---|
624 | nd6_ns_output(ifp, &in6_addr_unspecified, dst, ln, false);
|
---|
625 | }
|
---|
626 | }
|
---|
627 | }
|
---|
628 | return error;
|
---|
629 | }
|
---|
630 | }
|
---|
631 |
|
---|
632 | /*
|
---|
633 | * éè¤ãæ¤åºãããã¤ã³ã¿ãã§ã¼ã¹ã«ã¯åºåããªãã
|
---|
634 | */
|
---|
635 | if ((ifp->flags & ND6_IFF_IFDISABLED) != 0) {
|
---|
636 | return E_OK;
|
---|
637 | }
|
---|
638 |
|
---|
639 | IF_SET_PROTO(output, IF_PROTO_IPV6);
|
---|
640 | error = IF_OUTPUT(output, dst, ln ? & ln->ifaddr : NULL, tmout);
|
---|
641 | return error;
|
---|
642 |
|
---|
643 | err_ret:
|
---|
644 | syscall(rel_net_buf(output));
|
---|
645 | return error;
|
---|
646 | }
|
---|
647 |
|
---|
648 | /*
|
---|
649 | * nd6_storelladdr -- åºåãããããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ã®ã¢ãã¬ã¹ãè¿ãã
|
---|
650 | */
|
---|
651 |
|
---|
652 | ER
|
---|
653 | nd6_storelladdr (T_IF_ADDR *out, const T_IN6_ADDR *dst, T_IF_ADDR *ifa)
|
---|
654 | {
|
---|
655 | if (IN6_IS_ADDR_MULTICAST(dst)) {
|
---|
656 | IF_IN6_RESOLVE_MULTICAST(out, dst);
|
---|
657 | }
|
---|
658 | else {
|
---|
659 | *out = *ifa;
|
---|
660 | }
|
---|
661 |
|
---|
662 | return E_OK;
|
---|
663 | }
|
---|
664 |
|
---|
665 | /*
|
---|
666 | * nd6_option -- è¿é£æ¢ç´¢ãªãã·ã§ã³ã®å¦ç
|
---|
667 | *
|
---|
668 | * 注æ: ãªãã·ã§ã³ãªãã»ããé
|
---|
669 | åã«ã¯ããªãã»ãã + 8 ãè¨å®ããã¦ããã
|
---|
670 | */
|
---|
671 |
|
---|
672 | ER
|
---|
673 | nd6_options (uint8_t *opt, void *nh, uint_t len)
|
---|
674 | {
|
---|
675 | T_ND_OPT_HDR *opth;
|
---|
676 | ER error = E_OK;
|
---|
677 | int_t pi_count = 0; /* ãã¬ãã£ãã¯ã¹æ
|
---|
678 | å ±ã®åæ° */
|
---|
679 |
|
---|
680 | opth = (T_ND_OPT_HDR *)nh;
|
---|
681 | memset(opt, 0, ND_OPT_OFF_ARRAY_SIZE);
|
---|
682 |
|
---|
683 | while (error == E_OK && ((uint8_t *)opth - (uint8_t *)nh) < (256 - 8) && len > 0) {
|
---|
684 |
|
---|
685 | /* ãªãã·ã§ã³é·ã 0 ã®æã¯ãä¸æ£ãªãªãã·ã§ã³ã¨ãã¦å¦çããã*/
|
---|
686 | if (opth->len == 0) {
|
---|
687 | error = E_PAR;
|
---|
688 | break;
|
---|
689 | }
|
---|
690 |
|
---|
691 | /* ãªãã·ã§ã³ã®ã¿ã¤ãã«ããåå²ããã*/
|
---|
692 | switch (opth->type) {
|
---|
693 | case ND_OPT_SOURCE_LINKADDR: /* éä¿¡å
|
---|
694 | ãããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ã®ã¢ãã¬ã¹ */
|
---|
695 | case ND_OPT_TARGET_LINKADDR: /* 対象ãããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ã®ã¢ãã¬ã¹ */
|
---|
696 | case ND_OPT_REDIRECTED_HEADER: /* ãªãã¤ã¬ã¯ãã»ããã */
|
---|
697 | case ND_OPT_MTU: /* MTU */
|
---|
698 | if (opt[ND_OPT_OFF_ARRAY_IX(opth->type)]) {
|
---|
699 | /* ãã¬ãã£ãã¯ã¹æ
|
---|
700 | å ±ä»¥å¤ã®åããªãã·ã§ã³ãè¤æ°æå®ããã¦ããã*/
|
---|
701 | error = E_PAR;
|
---|
702 | }
|
---|
703 | else {
|
---|
704 | opt[ND_OPT_OFF_ARRAY_IX(opth->type)] = (uint8_t *)opth - (uint8_t *)nh + 8;
|
---|
705 | }
|
---|
706 | break;
|
---|
707 | case ND_OPT_PREFIX_INFORMATION: /* ãã¬ãã£ãã¯ã¹æ
|
---|
708 | å ± */
|
---|
709 | if (!opt[ND_OPT_OFF_ARRAY_IX(ND_OPT_PREFIX_INFORMATION)]) {
|
---|
710 | /*
|
---|
711 | * ãã¬ãã£ãã¯ã¹æ
|
---|
712 | å ±ã¯æåã«ç¾ãããªãã»ããã®ã¿è¨é²ããã
|
---|
713 | */
|
---|
714 | opt[ND_OPT_OFF_ARRAY_IX(opth->type)] = (uint8_t *)opth - (uint8_t *)nh + 8;
|
---|
715 | }
|
---|
716 | pi_count ++;
|
---|
717 | break;
|
---|
718 | default:
|
---|
719 | /*
|
---|
720 | * å°æ¥å®ç¾©ããããããã³ã«ã¸ã®æ¡å¼µã«å¯¾å¿ããããã
|
---|
721 | * èªèã§ããªããªãã·ã§ã³ã¯åã«ç¡è¦ããå¦çãç¶è¡ããã
|
---|
722 | */
|
---|
723 | break;
|
---|
724 | }
|
---|
725 | len -= opth->len << 3; /* ãªãã·ã§ã³é·ã®åä½ã¯ 8 ãã¤ã */
|
---|
726 | opth = (T_ND_OPT_HDR *)((uint8_t *)opth + (opth->len << 3));
|
---|
727 | }
|
---|
728 |
|
---|
729 | opt[ND_OPT_OFF_ARRAY_IX(ND_OPT_PREFIX_INFO_COUNT)] = pi_count;
|
---|
730 | return error;
|
---|
731 | }
|
---|
732 |
|
---|
733 | #endif /* of #ifdef _IP6_CFG */
|
---|