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_nbr.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_nbr.c,v 1.13 2002/10/16 01:54:45 sam Exp $ */
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47 | /* $KAME: nd6_nbr.c,v 1.86 2002/01/21 02:33:04 jinmei 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 | #include <string.h>
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79 |
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80 | #ifdef TARGET_KERNEL_ASP
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81 |
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82 | #include <kernel.h>
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83 | #include <sil.h>
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84 | #include <t_syslog.h>
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85 | #include "kernel_cfg.h"
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86 |
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87 | #endif /* of #ifdef TARGET_KERNEL_ASP */
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88 |
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89 | #ifdef TARGET_KERNEL_JSP
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90 |
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91 | #include <s_services.h>
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92 | #include <t_services.h>
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93 | #include "kernel_id.h"
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94 |
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95 | #endif /* of #ifdef TARGET_KERNEL_JSP */
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96 |
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97 | #include <tinet_defs.h>
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98 | #include <tinet_config.h>
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99 |
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100 | #include <net/if.h>
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101 | #include <net/if_ppp.h>
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102 | #include <net/if_loop.h>
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103 | #include <net/ethernet.h>
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104 | #include <net/if_arp.h>
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105 | #include <net/ppp_ipcp.h>
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106 | #include <net/net.h>
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107 | #include <net/net_endian.h>
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108 | #include <net/net_var.h>
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109 | #include <net/net_buf.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/ip_var.h>
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117 | #include <netinet/ip_icmp.h>
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118 |
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119 | #include <netinet6/nd6.h>
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120 |
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121 | #include <net/if6_var.h>
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122 |
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123 | #ifdef _IP6_CFG
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124 |
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125 | /*
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126 | * å±æé¢æ°
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127 | */
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128 |
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129 | static void nd6_dad_timer (T_IN6_IFADDR *ifa);
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130 | static void nd6_dad_duplicated (T_IFNET *ifp, T_IN6_IFADDR *ifa);
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131 | static void nd6_dad_ns_output (T_IFNET *ifp, T_IN6_IFADDR *ifa);
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132 | static void nd6_dad_ns_input (T_IFNET *ifp, T_IN6_IFADDR *ifa);
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133 | static void nd6_dad_na_input (T_IFNET *ifp, T_IN6_IFADDR *ifa);
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134 |
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135 | /*
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136 | * nd6_dad_duplicated -- éè¤ã¢ãã¬ã¹ãæ¤åºããæã®å¦ç
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137 | */
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138 |
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139 | static void
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140 | nd6_dad_duplicated (T_IFNET *ifp, T_IN6_IFADDR *ifa)
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141 | {
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142 | if ((ifa->flags & IN6_IFF_TENTATIVE) == 0)
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143 | syslog(LOG_ERROR, "[ND6 DAD DUP] no pending.");
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144 | else {
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145 | syslog(LOG_ERROR, "[ND6 DAD DUP] dup IPv6 addr: %s.", ipv62str(NULL, &ifa->addr));
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146 | ifa->flags &= ~IN6_IFF_TENTATIVE;
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147 | ifa->flags |= IN6_IFF_DUPLICATED;
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148 |
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149 | /* ã¿ã¤ãã¼ãåæ¢ããã*/
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150 | untimeout((callout_func)nd6_dad_timer, ifa);
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151 |
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152 | /*
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153 | * ãã IPv6 ã¢ãã¬ã¹ããã¦ãã¼ã¯ã«å²ãå½ã¦ãã
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154 | * ï¼ã¤ã¼ãµãããç¨ã® EUI-64ï¼ãã¼ãã¦ã§ã¢ã¢ãã¬ã¹ããã¼ã¹ã¨ãã
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155 | * ã¤ã³ã¿ãã§ã¼ã¹ ID ã§çæãããã®ã§ããã°ã
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156 | * ãã®ã¤ã³ã¿ãã§ã¼ã¹ã§ã® IPv6 ã®åä½ã¯ç¡å¹ã«ãã¹ãã§ãã
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157 | * ï¼RFC2462bis-03 ã»ã¯ã·ã§ã³ 5.4.5ï¼ã
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158 | */
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159 | if (IN6_IS_ADDR_LINKLOCAL(&ifa->addr))
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160 | ifp->flags |= ND6_IFF_IFDISABLED;
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161 | }
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162 | }
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163 |
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164 | /*
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165 | * nd6_dad_ns_output -- éè¤ã¢ãã¬ã¹æ¤åº (DAD) è¦è«ãåºåããã
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166 | */
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167 |
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168 | static void
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169 | nd6_dad_ns_output (T_IFNET *ifp, T_IN6_IFADDR *ifa)
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170 | {
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171 | NET_COUNT_ICMP6(net_count_nd6[NC_ND6_DAD_OUT_PACKETS], 1);
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172 |
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173 | ifa->ns_ocount ++;
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174 | nd6_ns_output(ifp, &in6_addr_unspecified, &ifa->addr, NULL, true);
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175 | }
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176 |
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177 | /*
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178 | * nd6_dad_ns_input -- éè¤ã¢ãã¬ã¹æ¤åº (DAD) è¦è«å
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179 | ¥å
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180 | */
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181 |
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182 | static void
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183 | nd6_dad_ns_input (T_IFNET *ifp, T_IN6_IFADDR *ifa)
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184 | {
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185 | NET_COUNT_ICMP6(net_count_nd6[NC_ND6_NS_IN_PACKETS], 1);
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186 |
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187 | /*
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188 | * ã¾ã ãéè¤ã¢ãã¬ã¹æ¤åºè¦è«ãåºåãã¦ããªãå ´å
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189 | */
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190 | if (ifa->ns_ocount == 0)
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191 | nd6_dad_duplicated(ifp, ifa);
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192 | else
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193 | ifa->ns_icount ++;
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194 | }
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195 |
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196 | /*
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197 | * nd6_dad_na_input -- éè¤ã¢ãã¬ã¹æ¤åº (DAD) éç¥å
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198 | ¥å
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199 | */
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200 |
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201 | static void
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202 | nd6_dad_na_input (T_IFNET *ifp, T_IN6_IFADDR *ifa)
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203 | {
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204 | NET_COUNT_ICMP6(net_count_nd6[NC_ND6_NA_IN_PACKETS], 1);
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205 | ifa->na_icount ++;
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206 | nd6_dad_duplicated(ifp, ifa);
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207 | }
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208 |
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209 | /*
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210 | * nd6_dad_timer -- éè¤ã¢ãã¬ã¹æ¤åº (DAD) ã¿ã¤ãã¼
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211 | */
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212 |
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213 | static void
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214 | nd6_dad_timer (T_IN6_IFADDR *ifa)
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215 | {
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216 | T_IFNET *ifp = IF_GET_IFNET();
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217 |
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218 | if (ifa->flags & IN6_IFF_DUPLICATED) {
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219 | syslog(LOG_ERROR, "[ND6 DAD] dup IPv6 addr: %s.", ipv62str(NULL, &ifa->addr));
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220 | return;
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221 | }
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222 |
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223 | if ((ifa->flags & IN6_IFF_TENTATIVE) == 0) {
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224 | syslog(LOG_ERROR, "[ND6 DAD] no tentative IPv6 addr: %s.", ipv62str(NULL, &ifa->addr));
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225 | return;
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226 | }
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227 |
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228 | if (ifa->ns_ocount < NUM_IP6_DAD_COUNT) {
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229 | nd6_dad_ns_output(ifp, ifa);
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230 |
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231 | /* ã¿ã¤ã ã¢ã¦ããè¿é£æ¢ç´¢ã®éä¿¡ééã«è¨å®ããã*/
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232 | timeout((callout_func)nd6_dad_timer, ifa, ND6_RETRANS_TIME * NET_TIMER_HZ / SYSTIM_HZ);
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233 | }
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234 | else if (ifa->na_icount || ifa->ns_icount)
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235 | nd6_dad_duplicated(ifp, ifa);
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236 | else {
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237 | ifa->flags &= ~IN6_IFF_TENTATIVE;
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238 | syslog(LOG_NOTICE, "[ND6 DAD] no dup IPv6 addr: %s.", ipv62str(NULL, &ifa->addr));
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239 | }
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240 | }
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241 |
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242 | /*
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243 | * nd6_ns_input -- è¿é£è¦è«ã®å
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244 | ¥åå¦çã
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245 | */
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246 |
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247 | void
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248 | nd6_ns_input (T_NET_BUF *input, uint_t off)
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249 | {
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250 | T_IFNET *ifp = IF_GET_IFNET();
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251 | T_IP6_HDR *ip6h;
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252 | T_NEIGHBOR_SOLICIT_HDR *nsh;
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253 | T_ND_OPT_HDR *opth;
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254 | T_IN6_IFADDR *ifa;
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255 | bool_t tlladdr;
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256 | uint_t lladdr_len = 0;
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257 | uint32_t flags;
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258 | uint8_t *lladdr = NULL;
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259 | uint8_t nd_opt_off[ND_OPT_OFF_ARRAY_SIZE];
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260 |
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261 | NET_COUNT_ICMP6(net_count_nd6[NC_ND6_NS_IN_PACKETS], 1);
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262 |
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263 | ip6h = GET_IP6_HDR(input);
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264 |
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265 | /*
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266 | * ãããã®ãã§ãã¯ã以ä¸ã®å ´åã¯ç ´æ£ããã
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267 | * ã»ããããªãããã IPV6_MAXHLIM (255) 以å¤
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268 | * ã»ãããé·ãçã
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269 | */
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270 | if (ip6h->hlim != IPV6_MAXHLIM || input->len - off < NEIGHBOR_SOLICIT_HDR_SIZE)
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271 | goto err_ret;
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272 |
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273 | nsh = (T_NEIGHBOR_SOLICIT_HDR *)(input->buf + off);
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274 |
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275 | if (IN6_IS_ADDR_UNSPECIFIED(&ip6h->src)) {
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276 | /*
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277 | * å§ç¹ã¢ãã¬ã¹ãç¡æå®ãªããéè¤ã¢ãã¬ã¹æ¤åº
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278 | * ãã¦å
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279 | ã¢ãã¬ã¹ã¯ãè¦è«ãã«ããã£ã¹ãã§ãªããã°ãªããªãã
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280 | */
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281 | if (!IN6_IS_ADDR_NS_MULTICAST(&ip6h->dst))
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282 | goto err_ret;
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283 | }
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284 |
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285 | /* ç®çã¢ãã¬ã¹ããã«ããã£ã¹ããªãã¨ã©ã¼ */
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286 | if (IN6_IS_ADDR_MULTICAST(&nsh->target))
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287 | goto err_ret;
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288 |
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289 | /* è¿é£æ¢ç´¢ãªãã·ã§ã³ã®ãªãã»ãããè¨é²ããã*/
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290 | if (nd6_options(nd_opt_off, input->buf + (off + NEIGHBOR_SOLICIT_HDR_SIZE),
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291 | input->len - (off + NEIGHBOR_SOLICIT_HDR_SIZE)) != E_OK)
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292 | goto err_ret;
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293 |
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294 | /* è¿é£æ¢ç´¢ãªãã·ã§ã³ (å§ç¹ãªã³ã¯ã¢ãã¬ã¹) */
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295 | if (nd_opt_off[ND_OPT_OFF_ARRAY_IX(ND_OPT_SOURCE_LINKADDR)]) {
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296 | opth = (T_ND_OPT_HDR *)((uint8_t *)(input->buf + off + NEIGHBOR_SOLICIT_HDR_SIZE) +
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297 | nd_opt_off[ND_OPT_OFF_ARRAY_IX(ND_OPT_SOURCE_LINKADDR)] - 8);
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298 | /* 注æ: ãªãã·ã§ã³ãªãã»ããé
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299 | åã«ã¯ããªãã»ãã + 8 ãè¨å®ããã¦ããã*/
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300 | lladdr = (uint8_t *)(opth + 1);
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301 | lladdr_len = (opth->len << 3);
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302 | }
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303 |
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304 | if (IN6_IS_ADDR_UNSPECIFIED(&ip6h->src) && lladdr != NULL)
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305 | goto err_ret;
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306 |
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307 | /* å®å
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308 | ã¢ãã¬ã¹ããã«ããã£ã¹ããªãè¿é£éç¥ã«ãã¼ã¿ãªã³ã¯å±¤ã®ã¢ãã¬ã¹ãä»ããã*/
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309 | if (IN6_IS_ADDR_MULTICAST(&ip6h->dst))
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310 | tlladdr = true;
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311 | else
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312 | tlladdr = false;
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313 |
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314 | /*
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315 | * ç®çã¢ãã¬ã¹ããèªåã®ãããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ã«
|
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316 | * å²ãå½ã¦ããã¦ããã¢ãã¬ã¹ã調ã¹ãã
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317 | * ãªãã代çãµã¼ãã¹ã¯å®è£
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318 | ãã¦ããªãã
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319 | */
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320 | ifa = in6_lookup_ifaddr(ifp, &nsh->target);
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321 |
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322 | if (ifa == NULL)
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323 | goto free_ret;
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324 |
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325 | /* æ¢ç´¢çµæã¢ãã¬ã¹ãéè¤ãã¦ããã°å¿çããªãã§çµäºããã*/
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326 | if (ifa->flags & IN6_IFF_DUPLICATED)
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327 | goto err_ret;
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328 |
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329 | /*
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330 | * ãããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ã®ã¢ãã¬ã¹é·ãä¸è´ããªããã°ã¨ã©ã¼
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331 | */
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332 | if (lladdr && lladdr_len != ((sizeof(T_IF_ADDR) + sizeof(T_ND_OPT_HDR) + 7) & ~7))
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333 | goto err_ret;
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334 |
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335 | /*
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336 | * å§ç¹ã¢ãã¬ã¹ãèªåã®ã¢ãã¬ã¹ã¨ä¸è´ããã°éè¤ãã¦ããã
|
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337 | */
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338 | if (IN6_ARE_ADDR_EQUAL(&ifa->addr, &ip6h->src))
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339 | goto free_ret;
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340 |
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341 | /* éè¤æ¤åºä¸ã«ãè¿é£è¦è«ãåä¿¡ããã¨ãã®å¦ç */
|
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342 | if (ifa->flags & IN6_IFF_TENTATIVE) {
|
---|
343 | if (IN6_IS_ADDR_UNSPECIFIED(&ip6h->src))
|
---|
344 | nd6_dad_ns_input(ifp, ifa);
|
---|
345 | goto free_ret;
|
---|
346 | }
|
---|
347 |
|
---|
348 | if ((ifa->flags & IN6_IFF_ANYCAST) || !tlladdr)
|
---|
349 | flags = 0;
|
---|
350 | else
|
---|
351 | flags = ND_NA_FLG_OVERRIDE;
|
---|
352 |
|
---|
353 | /*
|
---|
354 | * å§ç¹ã¢ãã¬ã¹ãç¡æå®ãªããéä¿¡ç¸æã¯éè¤ã¢ãã¬ã¹æ¤åºä¸ã§ã
|
---|
355 | * ç´æ¥éä¿¡ãããã¨ã¯ã§ããªãã®ã§ãå
|
---|
356 | ¨ãã¼ããã«ããã£ã¹ã
|
---|
357 | * ã¢ãã¬ã¹ã«éä¿¡ããã
|
---|
358 | */
|
---|
359 | if (IN6_IS_ADDR_UNSPECIFIED(&ip6h->src)) {
|
---|
360 | nd6_na_output(ifp, &in6_addr_linklocal_allnodes, &nsh->target, flags, tlladdr);
|
---|
361 | goto free_ret;
|
---|
362 | }
|
---|
363 |
|
---|
364 | /* è¿é£ãã£ãã·ã¥ã«ç»é²ããã*/
|
---|
365 | nd6_cache_lladdr(ifp, &ip6h->src, (T_IF_ADDR *)lladdr, ND_NEIGHBOR_SOLICIT, 0);
|
---|
366 |
|
---|
367 | nd6_na_output(ifp, &ip6h->src, &nsh->target, flags | ND_NA_FLG_SOLICITED, tlladdr);
|
---|
368 |
|
---|
369 | free_ret:
|
---|
370 | syscall(rel_net_buf(input));
|
---|
371 | return;
|
---|
372 |
|
---|
373 | err_ret:
|
---|
374 | NET_COUNT_ICMP6(net_count_nd6[NC_ICMP6_IN_ERR_PACKETS], 1);
|
---|
375 | syscall(rel_net_buf(input));
|
---|
376 | }
|
---|
377 |
|
---|
378 | /*
|
---|
379 | * nd6_ns_output -- è¿é£è¦è«ãåºåããã
|
---|
380 | */
|
---|
381 |
|
---|
382 | void
|
---|
383 | nd6_ns_output (T_IFNET *ifp, const T_IN6_ADDR *daddr,
|
---|
384 | const T_IN6_ADDR *taddr, T_LLINFO_ND6 *ln, bool_t dad)
|
---|
385 | {
|
---|
386 | T_NEIGHBOR_SOLICIT_HDR *nsh;
|
---|
387 | T_NET_BUF *output;
|
---|
388 | T_IP6_HDR *ip6h;
|
---|
389 | T_IF_ADDR *mac = NULL;
|
---|
390 | uint_t len;
|
---|
391 | uint16_t ipflags = 0;
|
---|
392 |
|
---|
393 | NET_COUNT_ICMP6(net_count_nd6[NC_ND6_NS_OUT_PACKETS], 1);
|
---|
394 |
|
---|
395 | if (IN6_IS_ADDR_MULTICAST(taddr))
|
---|
396 | return;
|
---|
397 |
|
---|
398 | /* è¿é£è¦è«ãã¤ãã¼ãé·ãè¨ç®ããã*/
|
---|
399 | if (!dad && IF_SOFTC_TO_IFADDR(ifp->ic))
|
---|
400 | len = (NEIGHBOR_SOLICIT_HDR_SIZE + ND_OPT_HDR_SIZE + sizeof(T_IF_ADDR) + 7) >> 3 << 3;
|
---|
401 | else
|
---|
402 | len = (NEIGHBOR_SOLICIT_HDR_SIZE + 7) >> 3 << 3;
|
---|
403 |
|
---|
404 | /*
|
---|
405 | * è¦è«ãã«ããã£ã¹ãã»ã¢ãã¬ã¹å®ã®è¿é£æ¢ç´¢ã§ã¯ã
|
---|
406 | * ä»ã®ãªã³ã¯ããã®å½é ããããã¼ã¿ã°ã©ã ã
|
---|
407 | * æé¤ãããããããããªãããã« IPV6_MAXHLIM (255) ãè¨å®ããã
|
---|
408 | */
|
---|
409 | if (IN6_IS_ADDR_UNSPECIFIED(daddr) || IN6_IS_ADDR_MULTICAST(daddr))
|
---|
410 | ipflags = IPV6_OUT_SET_HOP_LIMIT(IPV6_OUT_FLG_HOP_LIMIT, IPV6_MAXHLIM);
|
---|
411 |
|
---|
412 | /* ãããã¯ã¼ã¯ãããã¡ãç²å¾ããIPv6 ããããè¨å®ããã*/
|
---|
413 | if (in6_get_datagram(&output, len, 0, daddr, NULL,
|
---|
414 | IPPROTO_ICMPV6, IPV6_MAXHLIM,
|
---|
415 | NBA_SEARCH_ASCENT, TMO_ND6_NS_OUTPUT) != E_OK)
|
---|
416 | return;
|
---|
417 |
|
---|
418 | ip6h = GET_IP6_HDR(output);
|
---|
419 |
|
---|
420 | if (IN6_IS_ADDR_UNSPECIFIED(daddr)) {
|
---|
421 |
|
---|
422 | /* å®å
|
---|
423 | ã¢ãã¬ã¹ãç¡æå®ã®å ´åã¯ãè¦è«ãã«ããã£ã¹ãã¢ãã¬ã¹ãè¨å®ããã*/
|
---|
424 | ip6h->dst.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
|
---|
425 | ip6h->dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
|
---|
426 | ip6h->dst.s6_addr32[3] = taddr->s6_addr32[3];
|
---|
427 | ip6h->dst.s6_addr8[12] = 0xff;
|
---|
428 | }
|
---|
429 |
|
---|
430 | /* éä¿¡å
|
---|
431 | ã¢ãã¬ã¹ã®è¨å® */
|
---|
432 | if (!dad) {
|
---|
433 |
|
---|
434 | /* éè¤ã¢ãã¬ã¹æ¤åºã§ã¯ãªãæã®éä¿¡å
|
---|
435 | ã¢ãã¬ã¹æ±ºå®å¦çã*/
|
---|
436 | T_IN6_ADDR *saddr;
|
---|
437 |
|
---|
438 | if (ln && ln->hold) {
|
---|
439 | /*
|
---|
440 | * éä¿¡ããã³ãã£ã³ã°ããã¦ãããã¼ã¿ã°ã©ã ã®
|
---|
441 | * éä¿¡å
|
---|
442 | ã¢ãã¬ã¹ãå©ç¨ããã
|
---|
443 | */
|
---|
444 | if (ln->hold->len > IF_IP6_HDR_SIZE)
|
---|
445 | saddr = &GET_IP6_HDR(ln->hold)->src;
|
---|
446 | else
|
---|
447 | saddr = NULL;
|
---|
448 | }
|
---|
449 | else
|
---|
450 | saddr = NULL;
|
---|
451 |
|
---|
452 | if (saddr && in6_lookup_ifaddr(ifp, saddr))
|
---|
453 | memcpy(&ip6h->src, saddr, sizeof(T_IN6_ADDR));
|
---|
454 | else {
|
---|
455 | /*
|
---|
456 | * å®å
|
---|
457 | ã¢ãã¬ã¹ã«ãµããããéä¿¡å
|
---|
458 | ã¢ãã¬ã¹ãã
|
---|
459 | * ãããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ããæ¢ç´¢ãã¦å©ç¨ããã
|
---|
460 | */
|
---|
461 | T_IN6_IFADDR *ifa;
|
---|
462 |
|
---|
463 | if ((ifa = in6_ifawithifp(ifp, &ip6h->dst)) == NULL) {
|
---|
464 | syscall(rel_net_buf(output));
|
---|
465 | return;
|
---|
466 | }
|
---|
467 | memcpy(&ip6h->src, &ifa->addr, sizeof(T_IN6_ADDR));
|
---|
468 | }
|
---|
469 | }
|
---|
470 | else {
|
---|
471 |
|
---|
472 | /* éè¤ã¢ãã¬ã¹æ¤åºæã®éä¿¡å
|
---|
473 | ã¢ãã¬ã¹ã¯ç¡æå®ã*/
|
---|
474 | memset(&ip6h->src, 0, sizeof(T_IN6_ADDR));
|
---|
475 | }
|
---|
476 |
|
---|
477 | /* è¿é£è¦è«ããããè¨å®ããã*/
|
---|
478 | nsh = GET_NEIGHBOR_SOLICIT_HDR(output, IF_IP6_NEIGHBOR_SOLICIT_HDR_OFFSET);
|
---|
479 | nsh->hdr.type = ND_NEIGHBOR_SOLICIT;
|
---|
480 | nsh->hdr.code = 0;
|
---|
481 | nsh->hdr.data.data32 = 0;
|
---|
482 | memcpy(&nsh->target, taddr, sizeof(T_IN6_ADDR));
|
---|
483 |
|
---|
484 | if (!dad && (mac = IF_SOFTC_TO_IFADDR(ifp->ic)) != NULL) {
|
---|
485 |
|
---|
486 | /* è¿é£æ¢ç´¢ãªãã·ã§ã³ã¨ãã¦ãæ¢ç´¢ç®æ¨ã® MAC ã¢ãã¬ã¹ãè¨å®ããã*/
|
---|
487 | T_ND_OPT_HDR *opth;
|
---|
488 | uint_t optlen;
|
---|
489 |
|
---|
490 | opth = (T_ND_OPT_HDR *)GET_NEIGHBOR_SOLICIT_SDU(output, IF_IP6_NEIGHBOR_SOLICIT_HDR_OFFSET);
|
---|
491 | optlen = (ND_OPT_HDR_SIZE + sizeof(T_IF_ADDR) + 7) >> 3 << 3;
|
---|
492 | memset(opth, 0, optlen);
|
---|
493 | opth->type = ND_OPT_SOURCE_LINKADDR;
|
---|
494 | opth->len = optlen >> 3;
|
---|
495 | memcpy((uint8_t *)opth + sizeof(T_ND_OPT_HDR), mac, sizeof(T_IF_ADDR));
|
---|
496 | }
|
---|
497 |
|
---|
498 | /* ãã§ãã¯ãµã ãè¨ç®ããã*/
|
---|
499 | nsh->hdr.sum = 0;
|
---|
500 | nsh->hdr.sum = in6_cksum(output, IPPROTO_ICMPV6, (uint8_t*)nsh - output->buf, len);
|
---|
501 |
|
---|
502 | /* éä¿¡ããã*/
|
---|
503 | NET_COUNT_ICMP6(net_count_nd6[NC_ICMP6_OUT_OCTETS],
|
---|
504 | output->len - GET_IF_IP6_HDR_SIZE(output));
|
---|
505 | NET_COUNT_ICMP6(net_count_nd6[NC_ICMP6_OUT_PACKETS], 1);
|
---|
506 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpOutMsgs, 1);
|
---|
507 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpOutNeighborSolicits, 1);
|
---|
508 | ip6_output(output, ipflags | IPV6_OUT_FLG_DAD, TMO_ND6_NS_OUTPUT);
|
---|
509 | }
|
---|
510 |
|
---|
511 | /*
|
---|
512 | * nd6_na_input -- è¿é£éç¥ã®å
|
---|
513 | ¥åå¦çã
|
---|
514 | */
|
---|
515 |
|
---|
516 | void
|
---|
517 | nd6_na_input (T_NET_BUF *input, uint_t off)
|
---|
518 | {
|
---|
519 | T_IFNET *ifp = IF_GET_IFNET();
|
---|
520 | T_IP6_HDR *ip6h;
|
---|
521 | T_NEIGHBOR_ADVERT_HDR *nah;
|
---|
522 | T_ND_OPT_HDR *opth;
|
---|
523 | T_IN6_IFADDR *ifa;
|
---|
524 | T_LLINFO_ND6 *ln;
|
---|
525 | SYSTIM now;
|
---|
526 | bool_t llchange;
|
---|
527 | uint_t lladdr_len = 0;
|
---|
528 | uint8_t *lladdr = NULL;
|
---|
529 | uint8_t nd_opt_off[ND_OPT_OFF_ARRAY_SIZE];
|
---|
530 |
|
---|
531 | NET_COUNT_ICMP6(net_count_nd6[NC_ND6_NS_IN_PACKETS], 1);
|
---|
532 |
|
---|
533 | ip6h = GET_IP6_HDR(input);
|
---|
534 |
|
---|
535 | /*
|
---|
536 | * ãããã®ãã§ãã¯ã以ä¸ã®å ´åã¯ç ´æ£ããã
|
---|
537 | * ã»ããããªãããã IPV6_MAXHLIM (255) 以å¤
|
---|
538 | * ã»ãããé·ãçã
|
---|
539 | */
|
---|
540 | if (ip6h->hlim != IPV6_MAXHLIM || input->len - off < NEIGHBOR_ADVERT_HDR_SIZE)
|
---|
541 | goto err_ret;
|
---|
542 |
|
---|
543 | nah = (T_NEIGHBOR_ADVERT_HDR *)(input->buf + off);
|
---|
544 |
|
---|
545 | /* ç®çã¢ãã¬ã¹ããã«ããã£ã¹ããªãã¨ã©ã¼ */
|
---|
546 | if (IN6_IS_ADDR_MULTICAST(&nah->target))
|
---|
547 | goto err_ret;
|
---|
548 |
|
---|
549 | /* è¿é£è¦è«ã¸ã®å¿çã§ãå®å
|
---|
550 | ã¢ãã¬ã¹ããã«ããã£ã¹ããªãã¨ã©ã¼ */
|
---|
551 | if ((nah->nd_na_flags_reserved & ND_NA_FLG_SOLICITED) &&
|
---|
552 | IN6_IS_ADDR_MULTICAST(&ip6h->dst))
|
---|
553 | goto err_ret;
|
---|
554 |
|
---|
555 | /* è¿é£æ¢ç´¢ãªãã·ã§ã³ã®ãªãã»ãããè¨é²ããã*/
|
---|
556 | if (nd6_options(nd_opt_off, input->buf + (off + NEIGHBOR_ADVERT_HDR_SIZE),
|
---|
557 | input->len - (off + NEIGHBOR_ADVERT_HDR_SIZE)) != E_OK)
|
---|
558 | goto err_ret;
|
---|
559 |
|
---|
560 | /* è¿é£æ¢ç´¢ãªãã·ã§ã³ (ç®çãªã³ã¯ã¢ãã¬ã¹) */
|
---|
561 | if (nd_opt_off[ND_OPT_OFF_ARRAY_IX(ND_OPT_TARGET_LINKADDR)]) {
|
---|
562 | opth = (T_ND_OPT_HDR *)((uint8_t *)(input->buf + off + NEIGHBOR_ADVERT_HDR_SIZE) +
|
---|
563 | nd_opt_off[ND_OPT_OFF_ARRAY_IX(ND_OPT_TARGET_LINKADDR)] - 8);
|
---|
564 | /* 注æ: ãªãã·ã§ã³ãªãã»ããé
|
---|
565 | åã«ã¯ããªãã»ãã + 8 ãè¨å®ããã¦ããã*/
|
---|
566 | lladdr = (uint8_t *)(opth + 1);
|
---|
567 | lladdr_len = (opth->len << 3);
|
---|
568 | }
|
---|
569 |
|
---|
570 | ifa = in6_lookup_ifaddr(ifp, &nah->target);
|
---|
571 |
|
---|
572 | /*
|
---|
573 | * ç®çã¢ãã¬ã¹ãèªåã®ãããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ã«å²ãå½ã¦ããã¦ããã¢ãã¬ã¹ã®
|
---|
574 | * ããããã«ä¸è´ããã¨ãã¯ãéè¤ãã¦ãããã¨ãæå³ãã¦ããã
|
---|
575 | */
|
---|
576 | if (ifa) {
|
---|
577 | if (ifa->flags & IN6_IFF_TENTATIVE)
|
---|
578 | nd6_dad_na_input(ifp, ifa);
|
---|
579 | else
|
---|
580 | syslog(LOG_ERROR, "[ND6 NA INPUT] dup IPv6 addr: %s.", ipv62str(NULL, &ifa->addr));
|
---|
581 | goto err_ret;
|
---|
582 | }
|
---|
583 |
|
---|
584 | /*
|
---|
585 | * ãããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ã®ã¢ãã¬ã¹é·ãä¸è´ããªããã°ã¨ã©ã¼
|
---|
586 | */
|
---|
587 | if (lladdr && lladdr_len != ((sizeof(T_IF_ADDR) + sizeof(T_ND_OPT_HDR) + 7) & ~7))
|
---|
588 | goto err_ret;
|
---|
589 |
|
---|
590 | /* è¿é£ãã£ãã·ã¥ãæ¢ç´¢ããã*/
|
---|
591 | syscall(wai_sem(SEM_ND6_CACHE));
|
---|
592 | if ((ln = nd6_lookup(&nah->target, false)) == NULL)
|
---|
593 | goto free_ret;
|
---|
594 |
|
---|
595 | /* è¿é£ãã£ãã·ã¥ã®ç¶æ
|
---|
596 | ãããã¼ã¿ãªã³ã¯å±¤ã®ã¢ãã¬ã¹æªè§£æ±ºã®å ´å */
|
---|
597 | if (ln->state == ND6_LLINFO_INCOMPLETE) {
|
---|
598 | /* éç¥ããããã¼ã¿ãªã³ã¯å±¤ã®ã¢ãã¬ã¹ã®é·ãã 0 ã®å ´å */
|
---|
599 | if (lladdr == NULL)
|
---|
600 | goto free_ret;
|
---|
601 |
|
---|
602 | ln->ifaddr = *(T_IF_ADDR *)lladdr;
|
---|
603 | if (nah->nd_na_flags_reserved & ND_NA_FLG_SOLICITED) {
|
---|
604 | ln->state = ND6_LLINFO_REACHABLE;
|
---|
605 | /*ln->byhint = 0*/;
|
---|
606 | if (ln->expire) {
|
---|
607 | syscall(get_tim(&now));
|
---|
608 | ln->expire = now + ND6_REACHABLE_TIME;
|
---|
609 | }
|
---|
610 | }
|
---|
611 | else {
|
---|
612 | syscall(get_tim(&now));
|
---|
613 | ln->expire = now + ND6_GCOLLECTION_TIME;
|
---|
614 | ln->state = ND6_LLINFO_STALE;
|
---|
615 | }
|
---|
616 |
|
---|
617 | if ((nah->nd_na_flags_reserved & ND_NA_FLG_ROUTER) != 0)
|
---|
618 | ln->flags |= ND6_LLIF_ROUTER;
|
---|
619 | else
|
---|
620 | ln->flags &= ~ND6_LLIF_ROUTER;
|
---|
621 | if ((ln->flags & ND6_LLIF_ROUTER) != 0)
|
---|
622 | /*pfxlist_onlink_check()*/;
|
---|
623 | }
|
---|
624 | else {
|
---|
625 | if (lladdr == NULL)
|
---|
626 | llchange = false;
|
---|
627 | else if (memcmp(lladdr, &ln->ifaddr, sizeof(T_IF_ADDR)))
|
---|
628 | llchange = true;
|
---|
629 | else
|
---|
630 | llchange = false;
|
---|
631 |
|
---|
632 | /*
|
---|
633 | * ç¶æ
|
---|
634 | é·ç§»è¡¨
|
---|
635 | *
|
---|
636 | * nd_na_flags_reserved
|
---|
637 | * OVERRIDE SOLICTED lladdr llchange å¦ç (L: lladdr ãç»é²ãã)
|
---|
638 | *
|
---|
639 | * F F N - (2c)
|
---|
640 | * F F Y F (2b) L
|
---|
641 | * F F Y T (1) REACHABLE -> STALE
|
---|
642 | * F T N - (2c) * -> REACHABLE
|
---|
643 | * F T Y F (2b) L * -> REACHABLE
|
---|
644 | * F T Y T (1) REACHABLE -> STALE
|
---|
645 | * T F N - (2a)
|
---|
646 | * T F Y F (2a) L
|
---|
647 | * T F Y T (2a) L *-> STALE
|
---|
648 | * T T N - (2a) * -> REACHABLE
|
---|
649 | * T T Y F (2a) L * -> REACHABLE
|
---|
650 | * T T Y T (2a) L * -> REACHABLE
|
---|
651 | */
|
---|
652 | if ((nah->nd_na_flags_reserved & ND_NA_FLG_OVERRIDE) == 0 && (lladdr != NULL && llchange)) { /* (1) */
|
---|
653 | /* ç¶æ
|
---|
654 | ã REACHABLE ãªã STALE ã«é·ç§»ããã*/
|
---|
655 | if (ln->state == ND6_LLINFO_REACHABLE) {
|
---|
656 | syscall(get_tim(&now));
|
---|
657 | ln->expire = now + ND6_GCOLLECTION_TIME;
|
---|
658 | ln->state = ND6_LLINFO_STALE;
|
---|
659 | }
|
---|
660 | goto free_ret;
|
---|
661 | }
|
---|
662 | else if ((nah->nd_na_flags_reserved & ND_NA_FLG_OVERRIDE) || /* (2a) */
|
---|
663 | ((nah->nd_na_flags_reserved & ND_NA_FLG_OVERRIDE) == 0 && (lladdr != NULL && !llchange)) || /* (2b) */
|
---|
664 | lladdr == NULL) { /* (2c) */
|
---|
665 |
|
---|
666 | /* ãã¼ã¿ãªã³ã¯å±¤ã®ã¢ãã¬ã¹ãéç¥ããã¦ããã°æ´æ°ããã*/
|
---|
667 | if (lladdr != NULL)
|
---|
668 | ln->ifaddr = *(T_IF_ADDR *)lladdr;
|
---|
669 |
|
---|
670 | /* è¿é£è¦è«ã¸ã®å¿çãªã REACHABLE ã«é·ç§»ããã*/
|
---|
671 | if (nah->nd_na_flags_reserved & ND_NA_FLG_SOLICITED) {
|
---|
672 | ln->state = ND6_LLINFO_REACHABLE;
|
---|
673 | /*ln->byhint = 0*/;
|
---|
674 | if (ln->expire) {
|
---|
675 | syscall(get_tim(&now));
|
---|
676 | ln->expire = now + ND6_REACHABLE_TIME;
|
---|
677 | }
|
---|
678 | }
|
---|
679 | /*
|
---|
680 | * ãã¼ã¿ãªã³ã¯å±¤ã®ã¢ãã¬ã¹ãéç¥ããã
|
---|
681 | * ç°ãªãã¢ãã¬ã¹ãªãæ´æ°ããã
|
---|
682 | */
|
---|
683 | else if (lladdr != NULL && llchange) {
|
---|
684 | syscall(get_tim(&now));
|
---|
685 | ln->expire = now + ND6_GCOLLECTION_TIME;
|
---|
686 | ln->state = ND6_LLINFO_STALE;
|
---|
687 | }
|
---|
688 | }
|
---|
689 |
|
---|
690 | /* ã«ã¼ã¿éç¥ãã©ã°ã®å¦ç */
|
---|
691 | if ((ln->flags & ND6_LLIF_ROUTER ) != 0 &&
|
---|
692 | (nah->nd_na_flags_reserved & ND_NA_FLG_ROUTER) == 0) {
|
---|
693 | /*
|
---|
694 | * éä¿¡ç¸æãã«ã¼ã¿éç¥ãã©ã°ãç¡å¹ã«ããå ´åã
|
---|
695 | * ãã£ãã©ã«ãã»ã«ã¼ã¿ãªã¹ããã対象ã®ã«ã¼ã¿ãåé¤ãã
|
---|
696 | * è¿é£æ¢ç´¢ãã£ãã·ã¥ãæ´æ°ããã
|
---|
697 | */
|
---|
698 | T_DEF_ROUTER *dr = NULL;
|
---|
699 |
|
---|
700 | syscall(wai_sem(SEM_ND6_DEFRTRLIST));
|
---|
701 | if ((dr = nd6_defrtrlist_lookup(&ln->addr)) != NULL) {
|
---|
702 | nd6_defrtrlist_del(dr);
|
---|
703 | }
|
---|
704 | syscall(sig_sem(SEM_ND6_DEFRTRLIST));
|
---|
705 | }
|
---|
706 | if ((nah->nd_na_flags_reserved & ND_NA_FLG_ROUTER) != 0)
|
---|
707 | ln->flags |= ND6_LLIF_ROUTER;
|
---|
708 | else
|
---|
709 | ln->flags &= ~ND6_LLIF_ROUTER;
|
---|
710 | }
|
---|
711 |
|
---|
712 | ln->asked = 0;
|
---|
713 |
|
---|
714 | /* ã¢ãã¬ã¹è§£æ±ºå¾
|
---|
715 | ã¡ã®ãã¼ã¿ã°ã©ã ãããã°éä¿¡ããã*/
|
---|
716 | nd6_output_hold(ifp, ln);
|
---|
717 |
|
---|
718 | free_ret:
|
---|
719 | syscall(sig_sem(SEM_ND6_CACHE));
|
---|
720 | syscall(rel_net_buf(input));
|
---|
721 | return;
|
---|
722 |
|
---|
723 | err_ret:
|
---|
724 | NET_COUNT_ICMP6(net_count_nd6[NC_ICMP6_IN_ERR_PACKETS], 1);
|
---|
725 | syscall(rel_net_buf(input));
|
---|
726 | }
|
---|
727 |
|
---|
728 | /*
|
---|
729 | * nd6_na_output -- è¿é£éç¥ãåºåããã
|
---|
730 | */
|
---|
731 |
|
---|
732 | void
|
---|
733 | nd6_na_output (T_IFNET *ifp, const T_IN6_ADDR *daddr,
|
---|
734 | const T_IN6_ADDR *taddr, uint32_t flags, bool_t tlladdr)
|
---|
735 | {
|
---|
736 | T_NEIGHBOR_ADVERT_HDR *nah;
|
---|
737 | T_NET_BUF *output;
|
---|
738 | T_IP6_HDR *ip6h;
|
---|
739 | T_IN6_IFADDR *ifa;
|
---|
740 | T_IF_ADDR *mac = NULL;
|
---|
741 | uint_t len;
|
---|
742 | uint16_t ipflags = 0;
|
---|
743 |
|
---|
744 | NET_COUNT_ICMP6(net_count_nd6[NC_ND6_NA_OUT_PACKETS], 1);
|
---|
745 |
|
---|
746 | /*
|
---|
747 | * è¿é£éç¥ãã¤ãã¼ãé·ãè¨ç®ããã
|
---|
748 | * tlladdr ãçãªããããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ã®ã¢ãã¬ã¹ã追å ããã
|
---|
749 | */
|
---|
750 | if (tlladdr && IF_SOFTC_TO_IFADDR(ifp->ic))
|
---|
751 | len = (NEIGHBOR_ADVERT_HDR_SIZE + ND_OPT_HDR_SIZE + sizeof(T_IF_ADDR) + 7) >> 3 << 3;
|
---|
752 | else
|
---|
753 | len = (NEIGHBOR_ADVERT_HDR_SIZE + 7) >> 3 << 3;
|
---|
754 |
|
---|
755 | /*
|
---|
756 | * ä»ã®ãªã³ã¯ããã®å½é ããããã¼ã¿ã°ã©ã ã
|
---|
757 | * æé¤ãããããããããªãããã« IPV6_MAXHLIM (255) ãè¨å®ããã
|
---|
758 | */
|
---|
759 | ipflags = IPV6_OUT_SET_HOP_LIMIT(IPV6_OUT_FLG_HOP_LIMIT, IPV6_MAXHLIM);
|
---|
760 |
|
---|
761 | /* ãããã¯ã¼ã¯ãããã¡ãç²å¾ããIPv6 ããããè¨å®ããã*/
|
---|
762 | if (in6_get_datagram(&output, len, 0, daddr, NULL,
|
---|
763 | IPPROTO_ICMPV6, IPV6_MAXHLIM,
|
---|
764 | NBA_SEARCH_ASCENT, TMO_ND6_NA_OUTPUT) != E_OK)
|
---|
765 | return;
|
---|
766 |
|
---|
767 | ip6h = GET_IP6_HDR(output);
|
---|
768 |
|
---|
769 | if (IN6_IS_ADDR_UNSPECIFIED(daddr)) {
|
---|
770 | /*
|
---|
771 | * å®å
|
---|
772 | ã¢ãã¬ã¹ãç¡æå®ã®å ´åã¯ã
|
---|
773 | * ãªã³ã¯ãã¼ã«ã«å
|
---|
774 | ¨ãã¼ãã»ãã«ããã£ã¹ãã¢ãã¬ã¹ãè¨å®ããã
|
---|
775 | */
|
---|
776 | ip6h->dst.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
|
---|
777 | ip6h->dst.s6_addr32[1] = 0;
|
---|
778 | ip6h->dst.s6_addr32[2] = 0;
|
---|
779 | ip6h->dst.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
|
---|
780 | flags &= ~ND_NA_FLG_SOLICITED;
|
---|
781 | }
|
---|
782 | else
|
---|
783 | memcpy(&ip6h->dst, daddr, sizeof(T_IN6_ADDR));
|
---|
784 |
|
---|
785 | /*
|
---|
786 | * å®å
|
---|
787 | ã¢ãã¬ã¹ã«ãµããããéä¿¡å
|
---|
788 | ã¢ãã¬ã¹ãã
|
---|
789 | * ãããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ããæ¢ç´¢ãã¦å©ç¨ããã
|
---|
790 | */
|
---|
791 | if ((ifa = in6_ifawithifp(ifp, &ip6h->dst)) == NULL) {
|
---|
792 | syscall(rel_net_buf(output));
|
---|
793 | return;
|
---|
794 | }
|
---|
795 | memcpy(&ip6h->src, &ifa->addr, sizeof(T_IN6_ADDR));
|
---|
796 |
|
---|
797 | /* è¿é£éç¥ããããè¨å®ããã*/
|
---|
798 | nah = GET_NEIGHBOR_ADVERT_HDR(output, IF_IP6_NEIGHBOR_ADVERT_HDR_OFFSET);
|
---|
799 | nah->hdr.type = ND_NEIGHBOR_ADVERT;
|
---|
800 | nah->hdr.code = 0;
|
---|
801 | memcpy(&nah->target, taddr, sizeof(T_IN6_ADDR));
|
---|
802 |
|
---|
803 | /* tlladdr ãçãªããããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ã®ã¢ãã¬ã¹ã追å ããã*/
|
---|
804 | if (tlladdr && (mac = IF_SOFTC_TO_IFADDR(ifp->ic)) != NULL) {
|
---|
805 |
|
---|
806 | T_ND_OPT_HDR *opth;
|
---|
807 | uint_t optlen;
|
---|
808 |
|
---|
809 | opth = (T_ND_OPT_HDR *)GET_NEIGHBOR_ADVERT_SDU(output, IF_IP6_NEIGHBOR_ADVERT_HDR_OFFSET);
|
---|
810 | optlen = (ND_OPT_HDR_SIZE + sizeof(T_IF_ADDR) + 7) >> 3 << 3;
|
---|
811 | memset(opth, 0, optlen);
|
---|
812 | opth->type = ND_OPT_TARGET_LINKADDR;
|
---|
813 | opth->len = optlen >> 3;
|
---|
814 | memcpy((uint8_t *)opth + sizeof(T_ND_OPT_HDR), mac, sizeof(T_IF_ADDR));
|
---|
815 | }
|
---|
816 | else
|
---|
817 | flags &= ~ND_NA_FLG_OVERRIDE;
|
---|
818 |
|
---|
819 | nah->nd_na_flags_reserved = flags;
|
---|
820 |
|
---|
821 | /* ãã§ãã¯ãµã ãè¨ç®ããã*/
|
---|
822 | nah->hdr.sum = 0;
|
---|
823 | nah->hdr.sum = in6_cksum(output, IPPROTO_ICMPV6, (uint8_t*)nah - output->buf, len);
|
---|
824 |
|
---|
825 | /* éä¿¡ããã*/
|
---|
826 | NET_COUNT_ICMP6(net_count_nd6[NC_ICMP6_OUT_OCTETS],
|
---|
827 | output->len - GET_IF_IP6_HDR_SIZE(output));
|
---|
828 | NET_COUNT_ICMP6(net_count_nd6[NC_ICMP6_OUT_PACKETS], 1);
|
---|
829 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpOutMsgs, 1);
|
---|
830 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpOutNeighborAdvertisements, 1);
|
---|
831 | ip6_output(output, ipflags, TMO_ND6_NS_OUTPUT);
|
---|
832 | }
|
---|
833 |
|
---|
834 | /*
|
---|
835 | * nd6_dad_start -- éè¤ã¢ãã¬ã¹æ¤åº (DAD) ãéå§ããã
|
---|
836 | *
|
---|
837 | * 第3å¼æ°ã®tick ã¯ãã¤ã³ã¿ãã§ã¼ã¹ãèµ·åããã¦ãããéè¤æ¤åºã
|
---|
838 | * éä¿¡ããã¾ã§ã®æå°é
|
---|
839 | 延å¤ã§ããã
|
---|
840 | */
|
---|
841 |
|
---|
842 | void
|
---|
843 | nd6_dad_start (T_IFNET *ifp, T_IN6_IFADDR *ifa, int_t *tick)
|
---|
844 | {
|
---|
845 | /* ãã©ã°ããã§ãã¯ããã*/
|
---|
846 | if (!(ifa->flags & IN6_IFF_TENTATIVE))
|
---|
847 | return;
|
---|
848 |
|
---|
849 | #if NUM_IP6_DAD_COUNT == 0
|
---|
850 |
|
---|
851 | ifa->flags &= ~IN6_IFF_TENTATIVE;
|
---|
852 |
|
---|
853 | #else /* of #if NUM_IP6_DAD_COUNT == 0 */
|
---|
854 |
|
---|
855 | if (ifa->flags & IN6_IFF_ANYCAST) {
|
---|
856 | ifa->flags &= ~IN6_IFF_TENTATIVE;
|
---|
857 | return;
|
---|
858 | }
|
---|
859 | else if ((ifa->flags & IN6_IFF_TENTATIVE) == 0)
|
---|
860 | return;
|
---|
861 |
|
---|
862 | /* éè¤ã¢ãã¬ã¹æ¤åºã«ã¦ã³ã¿ããªã»ããããã*/
|
---|
863 | ifa->ns_icount = ifa->na_icount = ifa->ns_ocount = 0;
|
---|
864 |
|
---|
865 | /*
|
---|
866 | * éè¤ã¢ãã¬ã¹æ¤åºè¦è«ãéä¿¡ããããã ããã¤ã³ã¿ãã§ã¼ã¹ã
|
---|
867 | * åæåããç´å¾ã«ãæåã«éä¿¡ããå ´åã¯ãã©ã³ãã ãªé
|
---|
868 | 延ãè¡ãã
|
---|
869 | */
|
---|
870 | if (tick == NULL) {
|
---|
871 | nd6_dad_ns_output(ifp, ifa);
|
---|
872 |
|
---|
873 | /* ã¿ã¤ã ã¢ã¦ããè¿é£æ¢ç´¢ã®éä¿¡ééã«è¨å®ããã*/
|
---|
874 | timeout((callout_func)nd6_dad_timer, ifa, ND6_RETRANS_TIME * NET_TIMER_HZ / SYSTIM_HZ);
|
---|
875 | }
|
---|
876 | else {
|
---|
877 | int_t ntick;
|
---|
878 |
|
---|
879 | if (*tick == 0) /* æåã®éä¿¡ */
|
---|
880 | ntick = net_rand() % (ND6_FIRST_DAD_DELAY_TIME * NET_TIMER_HZ / SYSTIM_HZ);
|
---|
881 | else
|
---|
882 | ntick = *tick + net_rand() % (ND6_DAD_DELAY_TIME * NET_TIMER_HZ / SYSTIM_HZ);
|
---|
883 | *tick = ntick;
|
---|
884 | timeout((callout_func)nd6_dad_timer, ifa, ntick);
|
---|
885 | }
|
---|
886 |
|
---|
887 | #endif /* of #if NUM_IP6_DAD_COUNT == 0 */
|
---|
888 |
|
---|
889 | }
|
---|
890 |
|
---|
891 | #endif /* of #ifdef _IP6_CFG */
|
---|