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: icmp6.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/icmp66.c,v 1.6.2.6 2001/07/10 09:44:16 ume Exp $ */
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47 | /* $KAME: icmp66.c,v 1.211 2001/04/04 05:56:20 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 | * Copyright (c) 1982, 1986, 1988, 1993
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80 | * The Regents of the University of California. All rights reserved.
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81 | *
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82 | * Redistribution and use in source and binary forms, with or without
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83 | * modification, are permitted provided that the following conditions
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84 | * are met:
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85 | * 1. Redistributions of source code must retain the above copyright
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86 | * notice, this list of conditions and the following disclaimer.
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87 | * 2. Redistributions in binary form must reproduce the above copyright
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88 | * notice, this list of conditions and the following disclaimer in the
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89 | * documentation and/or other materials provided with the distribution.
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90 | * 3. All advertising materials mentioning features or use of this software
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91 | * must display the following acknowledgement:
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92 | * This product includes software developed by the University of
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93 | * California, Berkeley and its contributors.
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94 | * 4. Neither the name of the University nor the names of its contributors
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95 | * may be used to endorse or promote products derived from this software
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96 | * without specific prior written permission.
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97 | *
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98 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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99 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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100 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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101 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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102 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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103 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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104 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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105 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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106 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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107 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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108 | * SUCH DAMAGE.
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109 | *
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110 | * @(#)ip_icmp6.c 8.2 (Berkeley) 1/4/94
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111 | */
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112 |
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113 | #include <string.h>
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114 |
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115 | #ifdef TARGET_KERNEL_ASP
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116 |
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117 | #include <kernel.h>
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118 | #include <sil.h>
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119 | #include <t_syslog.h>
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120 | #include "tinet_cfg.h"
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121 |
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122 | #endif /* of #ifdef TARGET_KERNEL_ASP */
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123 |
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124 | #ifdef TARGET_KERNEL_JSP
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125 |
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126 | #include <s_services.h>
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127 | #include <t_services.h>
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128 | #include "tinet_id.h"
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129 |
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130 | #endif /* of #ifdef TARGET_KERNEL_JSP */
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131 |
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132 | #include <tinet_defs.h>
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133 | #include <tinet_config.h>
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134 |
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135 | #include <net/if.h>
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136 | #include <net/if_loop.h>
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137 | #include <net/if_ppp.h>
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138 | #include <net/ethernet.h>
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139 | #include <net/net.h>
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140 | #include <net/net_endian.h>
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141 | #include <net/net_buf.h>
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142 | #include <net/net_timer.h>
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143 | #include <net/net_count.h>
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144 |
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145 | #include <netinet/in.h>
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146 | #include <netinet/in_var.h>
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147 | #include <netinet/ip.h>
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148 | #include <netinet/ip_var.h>
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149 | #include <netinet/ip_icmp.h>
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150 | #include <netinet/tcp.h>
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151 | #include <netinet/tcp_var.h>
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152 | #include <netinet/udp_var.h>
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153 |
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154 | #include <netinet6/nd6.h>
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155 |
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156 | #ifdef _IP6_CFG
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157 |
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158 | /*
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159 | * å¤æ°
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160 | */
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161 |
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162 | #ifdef SUPPORT_MIB
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163 |
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164 | /*
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165 | * SNMP 㮠管çæ
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166 | å ±ãã¼ã¹ (MIB)
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167 | */
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168 |
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169 | T_ICMP6_IFSTAT icmp6_ifstat;
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170 |
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171 | #endif /* of #ifdef SUPPORT_MIB */
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172 |
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173 | /*
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174 | * icmp6_output -- ICMP6 ãã±ãããéä¿¡ããã
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175 | */
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176 |
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177 | static void
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178 | icmp6_output (T_NET_BUF *output, uint_t off)
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179 | {
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180 | T_IN6_IFADDR *ia;
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181 | T_IFNET *ifp = IF_GET_IFNET();
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182 | T_IP6_HDR *ip6h;
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183 | T_ICMP6_HDR *icmp6h;
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184 |
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185 | /*
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186 | * å®å
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187 | ã¢ãã¬ã¹ã«ãµããããéä¿¡å
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188 | ã¢ãã¬ã¹ãã
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189 | * ãããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ããæ¢ç´¢ãã¦å©ç¨ããã
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190 | */
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191 | ip6h = GET_IP6_HDR(output);
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192 | if ((ia = in6_ifawithifp(ifp, &ip6h->dst)) == NULL) {
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193 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpOutErrors, 1);
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194 | syscall(rel_net_buf(output));
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195 | return;
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196 | }
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197 | memcpy(&ip6h->src, &ia->addr, sizeof(T_IN6_ADDR));
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198 |
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199 | icmp6h = GET_ICMP6_HDR(output, off);
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200 |
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201 | /* ãã§ãã¯ãµã ãè¨ç®ããã*/
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202 | icmp6h->sum = 0;
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203 | icmp6h->sum = in6_cksum(output, IPPROTO_ICMPV6, (uint8_t*)icmp6h - output->buf,
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204 | ntohs(ip6h->plen) - (off - IF_IP6_HDR_SIZE));
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205 |
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206 | /* éä¿¡ããã*/
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207 | NET_COUNT_ICMP6(net_count_icmp6[NC_ICMP6_OUT_OCTETS],
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208 | output->len - GET_IF_IP6_HDR_SIZE(output));
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209 | NET_COUNT_ICMP6(net_count_icmp6[NC_ICMP6_OUT_PACKETS], 1);
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210 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpOutMsgs, 1);
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211 | ip6_output(output, 0, TMO_ICMP_OUTPUT);
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212 | }
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213 |
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214 | /*
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215 | * icmp6_echo_request -- ã¨ã³ã¼è¦æ±ãåä¿¡ããã¨ãã®å¦ç
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216 | */
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217 |
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218 | static void
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219 | icmp6_echo_request (T_NET_BUF *input, uint_t off)
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220 | {
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221 | T_IP6_HDR *ip6h;
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222 | T_ICMP6_HDR *icmp6h;
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223 | T_IFNET *ifp = IF_GET_IFNET();
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224 | T_IN6_IFADDR *ia;
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225 | T_IN6_ADDR dst;
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226 | uint_t diff;
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227 |
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228 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpInEchos, 1);
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229 |
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230 | ip6h = GET_IP6_HDR(input);
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231 |
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232 | /*
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233 | * IPv6 ããã㨠ICMPv6 ãããéã®æ¡å¼µããããé¤å»ããã
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234 | */
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235 | diff = off - IF_IP6_HDR_SIZE;
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236 | if (diff > 0) {
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237 | /* ICMPv6 ããããåã«è©°ããã*/
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238 | memmove(input->buf + IF_IP6_HDR_SIZE, input->buf + off, input->len - off);
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239 | off = IF_IP6_HDR_SIZE;
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240 |
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241 | /* ãã¤ãã¼ãé·ã調æ´ããã*/
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242 | ip6h->plen = htons(ntohs(ip6h->plen) - diff);
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243 | input->len -= diff;
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244 | }
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245 |
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246 | icmp6h = GET_ICMP6_HDR(input, off);
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247 | if (icmp6h->code != 0) {
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248 | NET_COUNT_ICMP6(net_count_icmp6[NC_ICMP6_IN_ERR_PACKETS], 1);
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249 | syscall(rel_net_buf(input));
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250 | return;
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251 | }
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252 |
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253 | /*
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254 | * ã¡ãã»ã¼ã¸ã®åãã¨ã³ã¼è¦æ± (128) ãã
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255 | * ã¨ã³ã¼å¿ç (129) ã«å¤æ´ãã¦éãè¿ãã
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256 | */
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257 | icmp6h->type = ICMP6_ECHO_REPLY;
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258 |
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259 | /* IPv6 ãããã®çºä¿¡å
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260 | ã¢ãã¬ã¹ã¨å®å
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261 | ã¢ãã¬ã¹ãå
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262 | ¥æ¿ããã*/
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263 | memcpy(&dst, &ip6h->dst, sizeof(T_IN6_ADDR));
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264 | memcpy(&ip6h->dst, &ip6h->src, sizeof(T_IN6_ADDR));
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265 | memcpy(&ip6h->src, &dst, sizeof(T_IN6_ADDR));
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266 |
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267 | /*
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268 | * å
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269 | ã®å®å
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270 | ã¢ãã¬ã¹ããã«ããã£ã¹ãã®å ´åã¯ã
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271 | * å®å
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272 | ã¢ãã¬ã¹ã«ãµããããéä¿¡å
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273 | ã¢ãã¬ã¹ãã
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274 | * ãããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ããæ¢ç´¢ãã¦å©ç¨ããã
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275 | */
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276 | if (IN6_IS_ADDR_MULTICAST(&dst)) {
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277 | if ((ia = in6_ifawithifp(ifp, &ip6h->dst)) == NULL) {
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278 | syscall(rel_net_buf(input));
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279 | return;
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280 | }
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281 | else
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282 | memcpy(&ip6h->src, &ia->addr, sizeof(T_IN6_ADDR));
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283 | }
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284 |
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285 | /* 次ãããã¨ããããªããããè¨å®ããã*/
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286 | ip6h->next = IPPROTO_ICMPV6;
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287 | ip6h->hlim = IP6_DEFTTL;
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288 |
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289 | /* ãã§ãã¯ãµã ãè¨ç®ããã*/
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290 | icmp6h->sum = 0;
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291 | icmp6h->sum = in6_cksum(input, IPPROTO_ICMPV6, (uint8_t*)icmp6h - input->buf,
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292 | ntohs(ip6h->plen) - (off - IF_IP6_HDR_SIZE));
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293 |
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294 | /* éä¿¡ããã*/
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295 | NET_COUNT_ICMP6(net_count_icmp6[NC_ICMP6_OUT_OCTETS],
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296 | input->len - GET_IF_IP6_HDR_SIZE(input));
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297 | NET_COUNT_ICMP6(net_count_icmp6[NC_ICMP6_OUT_PACKETS], 1);
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298 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpOutMsgs, 1);
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299 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpOutEchoReplies, 1);
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300 | ip6_output(input, 0, TMO_ICMP_OUTPUT);
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301 | }
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302 |
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303 | /*
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304 | * icmp6_notify_error -- ã¨ã©ã¼ãéç¥ããã
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305 | */
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306 |
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307 | static void
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308 | icmp6_notify_error(T_NET_BUF *input, uint_t poff)
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309 | {
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310 | T_ICMP6_HDR *icmp6h;
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311 | ER_UINT loff;
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312 | uint_t len, next;
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313 |
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314 | len = input->len - poff;
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315 |
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316 | /* ãã¼ã¿ã°ã©ã é·ã ICMP6 ãããé· + IP6 ãããé·ä»¥ä¸ãªãä½ãããªãã*/
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317 | if (len < ICMP6_HDR_SIZE + IP6_HDR_SIZE)
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318 | return;
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319 |
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320 | icmp6h = GET_ICMP6_HDR(input, poff);
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321 |
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322 | /* æçµããããæ¢ç´¢ããã*/
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323 | loff = ip6_lasthdr(input, poff + ICMP6_HDR_SIZE, IPPROTO_IPV6, &next);
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324 |
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325 | /* æçµãããã TCP/UDP ã®ã¿å¯¾å¿ããã*/
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326 | if (loff >= 0 && (next == IPPROTO_TCP || next == IPPROTO_UDP)) {
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327 |
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328 | memcpy(GET_IP6_HDR(input), input->buf + (loff + ICMP6_HDR_SIZE),
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329 | input->len - (loff + ICMP6_HDR_SIZE));
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330 | input->len -= loff + ICMP6_HDR_SIZE;
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331 |
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332 | #if defined(SUPPORT_TCP)
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333 |
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334 | if (next == IPPROTO_TCP)
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335 |
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336 | tcp_notify(input, icmp6h->code == ICMP6_DST_UNREACH_NOPORT ? EV_CNNRF : EV_HURCH);
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337 |
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338 | #endif /* of #if defined(SUPPORT_TCP) */
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339 |
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340 | #if defined(SUPPORT_UDP) && TNUM_UDP6_CEPID > 0
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341 |
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342 | if (next == IPPROTO_UDP)
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343 |
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344 | udp6_notify(input, icmp6h->code == ICMP6_DST_UNREACH_NOPORT ? EV_CNNRF : EV_HURCH);
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345 |
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346 | #endif /* of #if defined(SUPPORT_UDP) && TNUM_UDP6_CEPID > 0 */
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347 |
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348 | }
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349 | else
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350 | syslog(LOG_NOTICE, "[ICMP6] error code: %d.", icmp6h->code);
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351 | }
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352 |
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353 | #if NUM_IN6_HOSTCACHE_ENTRY > 0
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354 |
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355 | /*
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356 | * icmp6_mtudisc_update -- Path MTU ãæ´æ°ããã
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357 | */
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358 |
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359 | static void
|
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360 | icmp6_mtudisc_update(T_NET_BUF *input, uint_t off, uint32_t mtu)
|
---|
361 | {
|
---|
362 | T_IP6_HDR *pip6h;
|
---|
363 |
|
---|
364 | pip6h = (T_IP6_HDR*)GET_ICMP6_SDU(input, off);
|
---|
365 |
|
---|
366 | if (mtu < IP6_HDR_SIZE + sizeof(T_IP6_FRAG_HDR) + 8)
|
---|
367 | return;
|
---|
368 |
|
---|
369 | if (mtu > IF_MTU)
|
---|
370 | return;
|
---|
371 |
|
---|
372 | in6_hostcache_update(&pip6h->dst, mtu);
|
---|
373 | }
|
---|
374 |
|
---|
375 | #endif /* of #if NUM_IN6_HOSTCACHE_ENTRY > 0 */
|
---|
376 |
|
---|
377 | #if defined(NUM_IN6_REDIRECT_ROUTE_ENTRY)
|
---|
378 | #if NUM_IN6_REDIRECT_ROUTE_ENTRY > 0
|
---|
379 |
|
---|
380 | /*
|
---|
381 | * icmp6_redirect_input -- åãç´ãã¡ãã»ã¼ã¸ã®å¦ç
|
---|
382 | */
|
---|
383 |
|
---|
384 | static void
|
---|
385 | icmp6_redirect_input (T_NET_BUF *input, uint_t off)
|
---|
386 | {
|
---|
387 | T_IP6_HDR *ip6h;
|
---|
388 | const T_IN6_ADDR *gw;
|
---|
389 | T_ND_REDIRECT_HDR *rdh;
|
---|
390 | T_ND_OPT_HDR *opth;
|
---|
391 | T_IFNET *ifp = IF_GET_IFNET();
|
---|
392 | bool_t router, onlink;
|
---|
393 | uint_t lladdr_len = 0;
|
---|
394 | uint8_t *lladdr = NULL;
|
---|
395 | uint8_t nd_opt_off[ND_OPT_OFF_ARRAY_SIZE];
|
---|
396 |
|
---|
397 | ip6h = GET_IP6_HDR(input);
|
---|
398 |
|
---|
399 | /*
|
---|
400 | * IP ãããã®ãã§ãã¯ã以ä¸ã®å ´åã¯ç ´æ£ããã
|
---|
401 | * ã»ãªã³ã¯ãã¼ã«ã«ä»¥å¤ããéããã¦ããã¡ãã»ã¼ã¸
|
---|
402 | * ã»ããããªãããã IPV6_MAXHLIM (255) 以å¤
|
---|
403 | */
|
---|
404 | if (!IN6_IS_ADDR_LINKLOCAL(&ip6h->src) || ip6h->hlim != IPV6_MAXHLIM)
|
---|
405 | goto err_ret;
|
---|
406 |
|
---|
407 | rdh = (T_ND_REDIRECT_HDR *)(input->buf + off);
|
---|
408 |
|
---|
409 | /* åãç´ãã®çµç¹ã¢ãã¬ã¹ããã«ããã£ã¹ãã¢ãã¬ã¹ã®å ´åã¯ç ´æ£ããã*/
|
---|
410 | if (IN6_IS_ADDR_MULTICAST(&rdh->dst))
|
---|
411 | goto err_ret;
|
---|
412 |
|
---|
413 | /* ã¿ã¼ã²ããã¢ãã¬ã¹ãçµè·¯è¡¨ã«ç»é²ããã¦ããããã§ãã¯ããã*/
|
---|
414 | if ((gw = in6_rtalloc(ifp, &rdh->dst)) != NULL) {
|
---|
415 | /* GW ã¢ãã¬ã¹ã¨éä¿¡å
|
---|
416 | ã¢ãã¬ã¹ãç°ãªã£ã¦ããã°ç ´æ£ããã*/
|
---|
417 | if (!IN6_ARE_ADDR_EQUAL(gw, &ip6h->src))
|
---|
418 | goto err_ret;
|
---|
419 | }
|
---|
420 | else /* çµè·¯è¡¨ã«ãªããã°ç ´æ£ããã*/
|
---|
421 | goto err_ret;
|
---|
422 |
|
---|
423 | router = onlink = false;
|
---|
424 |
|
---|
425 | /*
|
---|
426 | * ã¿ã¼ã²ããã¢ãã¬ã¹ããªã³ã¯ãã¼ã«ã«ã¢ãã¬ã¹ã§ããã°ã
|
---|
427 | * ã¿ã¼ã²ããã¯ã«ã¼ã¿
|
---|
428 | */
|
---|
429 | if (IN6_IS_ADDR_LINKLOCAL(&rdh->target))
|
---|
430 | router = true;
|
---|
431 |
|
---|
432 | /*
|
---|
433 | * ã¿ã¼ã²ããã¢ãã¬ã¹ã¨çµç¹ã¢ãã¬ã¹ãåä¸ã§ããã°ããªã³ãªã³ã¯
|
---|
434 | */
|
---|
435 | if (IN6_ARE_ADDR_EQUAL(&rdh->target, &rdh->dst))
|
---|
436 | onlink = true;
|
---|
437 |
|
---|
438 | /*
|
---|
439 | * ã«ã¼ã¿ã§ãããªã³ãªã³ã¯ã§ããªããã°ã¨ã©ã¼
|
---|
440 | */
|
---|
441 | if (!router && !onlink)
|
---|
442 | goto err_ret;
|
---|
443 |
|
---|
444 | /* è¿é£æ¢ç´¢ãªãã·ã§ã³ã®ãªãã»ãããè¨é²ããã*/
|
---|
445 | if (nd6_options(nd_opt_off, input->buf + off + ND_REDIRECT_HDR_SIZE,
|
---|
446 | input->len - (off + ND_REDIRECT_HDR_SIZE)) != E_OK)
|
---|
447 | goto err_ret;
|
---|
448 |
|
---|
449 | /* è¿é£æ¢ç´¢ãªãã·ã§ã³ (åãç´ãã®ã«ã¼ã¿ã®ãªã³ã¯ã¢ãã¬ã¹) */
|
---|
450 | if (nd_opt_off[ND_OPT_OFF_ARRAY_IX(ND_OPT_TARGET_LINKADDR)]) {
|
---|
451 | opth = (T_ND_OPT_HDR *)((uint8_t *)(input->buf + off + ND_REDIRECT_HDR_SIZE) +
|
---|
452 | nd_opt_off[ND_OPT_OFF_ARRAY_IX(ND_OPT_TARGET_LINKADDR)] - 8);
|
---|
453 | /* 注æ: ãªãã·ã§ã³ãªãã»ããé
|
---|
454 | åã«ã¯ããªãã»ãã + 8 ãè¨å®ããã¦ããã*/
|
---|
455 | lladdr = (uint8_t *)(opth + 1);
|
---|
456 | lladdr_len = (opth->len << 3);
|
---|
457 | }
|
---|
458 |
|
---|
459 | /*
|
---|
460 | * ãããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ã®ã¢ãã¬ã¹é·ãä¸è´ããªããã°ã¨ã©ã¼
|
---|
461 | */
|
---|
462 | if (lladdr && lladdr_len != ((sizeof(T_IF_ADDR) + sizeof(T_ND_OPT_HDR) + 7) & ~7))
|
---|
463 | goto err_ret;
|
---|
464 |
|
---|
465 | /* åãç´ãã®ã«ã¼ã¿ã®ãªã³ã¯ã¢ãã¬ã¹ãè¿é£ãã£ãã·ã¥ã«ç»é²ããã*/
|
---|
466 | nd6_cache_lladdr(ifp, &rdh->target, (T_IF_ADDR *)lladdr, ND_REDIRECT,
|
---|
467 | onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
|
---|
468 |
|
---|
469 | /* ã«ã¼ãã£ã³ã°è¡¨ã«ç»é²ããã*/
|
---|
470 | in6_rtredirect(&rdh->target, &rdh->dst, 128, IN_RTF_REDIRECT, TMO_IN_REDIRECT);
|
---|
471 |
|
---|
472 | syscall(rel_net_buf(input));
|
---|
473 | return;
|
---|
474 |
|
---|
475 | err_ret:
|
---|
476 | NET_COUNT_ICMP6(net_count_nd6[NC_ICMP6_IN_ERR_PACKETS], 1);
|
---|
477 | syscall(rel_net_buf(input));
|
---|
478 | }
|
---|
479 |
|
---|
480 | #endif /* of #if NUM_IN6_REDIRECT_ROUTE_ENTRY > 0 */
|
---|
481 | #endif /* of #if defined(NUM_IN6_REDIRECT_ROUTE_ENTRY) */
|
---|
482 |
|
---|
483 | /*
|
---|
484 | * icmp6_input -- ICMP6 ã®å
|
---|
485 | ¥åé¢æ°
|
---|
486 | */
|
---|
487 |
|
---|
488 | uint_t
|
---|
489 | icmp6_input (T_NET_BUF **inputp, uint_t *offp, uint_t *nextp)
|
---|
490 | {
|
---|
491 | T_NET_BUF *input = *inputp;
|
---|
492 | T_IP6_HDR *ip6h;
|
---|
493 | T_ICMP6_HDR *icmp6h;
|
---|
494 | uint_t len, off = *offp;
|
---|
495 | uint8_t code;
|
---|
496 |
|
---|
497 | NET_COUNT_ICMP6(net_count_icmp6[NC_ICMP6_IN_OCTETS],
|
---|
498 | input->len - GET_IF_IP6_HDR_SIZE(input));
|
---|
499 | NET_COUNT_ICMP6(net_count_icmp6[NC_ICMP6_IN_PACKETS], 1);
|
---|
500 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpInMsgs, 1);
|
---|
501 |
|
---|
502 | /* ICMP6 ãããã®é·ãããã§ãã¯ããã*/
|
---|
503 | len = input->len - off;
|
---|
504 | if (len < ICMP6_HDR_SIZE) {
|
---|
505 | NET_COUNT_ICMP6(net_count_icmp6[NC_ICMP6_IN_ERR_PACKETS], 1);
|
---|
506 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpInErrors, 1);
|
---|
507 | goto buf_rel;
|
---|
508 | }
|
---|
509 |
|
---|
510 | ip6h = GET_IP6_HDR(input);
|
---|
511 | icmp6h = GET_ICMP6_HDR(input, off);
|
---|
512 |
|
---|
513 | /* ãã§ãã¯ãµã ãè¨ç®ããã*/
|
---|
514 | if ((in6_cksum(input, IPPROTO_ICMPV6, off, ntohs(ip6h->plen) - (off - IF_IP6_HDR_SIZE)) & 0xffff) != 0) {
|
---|
515 | NET_COUNT_ICMP6(net_count_icmp6[NC_ICMP6_IN_ERR_PACKETS], 1);
|
---|
516 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpInErrors, 1);
|
---|
517 | goto buf_rel;
|
---|
518 | }
|
---|
519 |
|
---|
520 | code = icmp6h->code;
|
---|
521 |
|
---|
522 | /* ã¡ãã»ã¼ã¸ã®åã«ããåå²ããã*/
|
---|
523 | switch (icmp6h->type) {
|
---|
524 |
|
---|
525 | case ICMP6_DST_UNREACH: /* å®å
|
---|
526 | å°éä¸å¯è½ */
|
---|
527 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpInDestUnreachs, 1);
|
---|
528 | icmp6_notify_error(input, off);
|
---|
529 | break;
|
---|
530 |
|
---|
531 | case ICMP6_ECHO_REQUEST: /* ã¨ã³ã¼è¦æ± */
|
---|
532 | icmp6_echo_request(input, off);
|
---|
533 | return IPPROTO_DONE;
|
---|
534 | break;
|
---|
535 |
|
---|
536 | case ICMP6_ECHO_REPLY: /* ã¨ã³ã¼å¿ç */
|
---|
537 |
|
---|
538 | #ifdef ICMP_CFG_CALLBACK_ECHO_REPLY
|
---|
539 |
|
---|
540 | icmp6_echo_reply(input, off);
|
---|
541 |
|
---|
542 | #endif /* of #ifdef ICMP_CFG_CALLBACK_ECHO_REPLY */
|
---|
543 |
|
---|
544 | break;
|
---|
545 |
|
---|
546 | case ND_ROUTER_ADVERT: /* ã«ã¼ã¿éç¥ */
|
---|
547 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpInRouterAdvertisements, 1);
|
---|
548 | if (code != 0 || len < ROUTER_ADVERT_HDR_SIZE)
|
---|
549 | goto buf_rel;
|
---|
550 | nd6_ra_input(input, off);
|
---|
551 | return IPPROTO_DONE;
|
---|
552 | break;
|
---|
553 |
|
---|
554 | case ND_NEIGHBOR_SOLICIT: /* è¿é£è¦è« */
|
---|
555 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpInNeighborSolicits, 1);
|
---|
556 | if (code != 0 || len < NEIGHBOR_SOLICIT_HDR_SIZE)
|
---|
557 | goto buf_rel;
|
---|
558 | nd6_ns_input(input, off);
|
---|
559 | return IPPROTO_DONE;
|
---|
560 | break;
|
---|
561 |
|
---|
562 | case ND_NEIGHBOR_ADVERT: /* è¿é£éç¥ */
|
---|
563 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpInNeighborAdvertisements, 1);
|
---|
564 | if (code != 0 || len < NEIGHBOR_ADVERT_HDR_SIZE)
|
---|
565 | goto buf_rel;
|
---|
566 | nd6_na_input(input, off);
|
---|
567 | return IPPROTO_DONE;
|
---|
568 | break;
|
---|
569 |
|
---|
570 | case ND_REDIRECT: /* åãç´ã */
|
---|
571 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpInRedirects, 1);
|
---|
572 |
|
---|
573 | #if defined(NUM_IN6_REDIRECT_ROUTE_ENTRY)
|
---|
574 | #if NUM_IN6_REDIRECT_ROUTE_ENTRY > 0
|
---|
575 |
|
---|
576 | if (code != 0 || len < ND_REDIRECT_HDR_SIZE)
|
---|
577 | goto buf_rel;
|
---|
578 | icmp6_redirect_input(input, off);
|
---|
579 | return IPPROTO_DONE;
|
---|
580 |
|
---|
581 | #else /* of #if NUM_IN6_REDIRECT_ROUTE_ENTRY > 0 */
|
---|
582 |
|
---|
583 | syslog(LOG_WARNING, "[ICMP6] redirect ignored.");
|
---|
584 |
|
---|
585 | #endif /* of #if NUM_IN6_REDIRECT_ROUTE_ENTRY > 0 */
|
---|
586 | #else /* of #if defined(NUM_IN6_REDIRECT_ROUTE_ENTRY) */
|
---|
587 |
|
---|
588 | syslog(LOG_WARNING, "[ICMP6] redirect ignored.");
|
---|
589 |
|
---|
590 | #endif /* of #if defined(NUM_IN6_REDIRECT_ROUTE_ENTRY) */
|
---|
591 |
|
---|
592 | break;
|
---|
593 |
|
---|
594 | case ICMP6_PACKET_TOO_BIG: /* ãã±ããã大ããããã */
|
---|
595 |
|
---|
596 | #if NUM_IN6_HOSTCACHE_ENTRY > 0
|
---|
597 |
|
---|
598 | icmp6_mtudisc_update(input, off, ntohl(icmp6h->icmp6_mtu));
|
---|
599 |
|
---|
600 | #endif /* of #if NUM_IN6_HOSTCACHE_ENTRY > 0 */
|
---|
601 |
|
---|
602 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpInPktTooBigs, 1);
|
---|
603 | break;
|
---|
604 |
|
---|
605 | case ICMP6_TIME_EXCEEDED: /* TTL ãè¶
|
---|
606 | éããã */
|
---|
607 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpInTimeExcds, 1);
|
---|
608 | break;
|
---|
609 |
|
---|
610 | case ICMP6_PARAM_PROB: /* IPv6 ããããä¸æ£ã */
|
---|
611 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpInParmProblems, 1);
|
---|
612 | break;
|
---|
613 |
|
---|
614 | case MLD_LISTENER_QUERY: /* ãã«ããã£ã¹ãåä¿¡è
|
---|
615 | ç
|
---|
616 | §ä¼ */
|
---|
617 | case MLD_LISTENER_REPORT: /* ãã«ããã£ã¹ãåä¿¡è
|
---|
618 | å ±å */
|
---|
619 | case MLD_LISTENER_DONE: /* ãã«ããã£ã¹ãåä¿¡è
|
---|
620 | çµäº */
|
---|
621 | case ND_ROUTER_SOLICIT: /* ã«ã¼ã¿è¦è« */
|
---|
622 | case ICMP6_ROUTER_RENUMBERING: /* ã«ã¼ã¿çªå·åè¨å® */
|
---|
623 | case ICMP6_FQDN_QUERY: /* FQDN ç
|
---|
624 | §ä¼ */
|
---|
625 | case ICMP6_FQDN_REPLY: /* FQDN å¿ç */
|
---|
626 | syslog(LOG_INFO, "[ICMP6] unsupported type: %d.", icmp6h->type);
|
---|
627 | break;
|
---|
628 |
|
---|
629 | default:
|
---|
630 | syslog(LOG_WARNING, "[ICMP6] unknown type: %d.", icmp6h->type);
|
---|
631 | NET_COUNT_ICMP6(net_count_icmp6[NC_ICMP6_IN_ERR_PACKETS], 1);
|
---|
632 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpInErrors, 1);
|
---|
633 | break;
|
---|
634 | }
|
---|
635 |
|
---|
636 | buf_rel:
|
---|
637 | syscall(rel_net_buf(input));
|
---|
638 | return IPPROTO_DONE;
|
---|
639 | }
|
---|
640 |
|
---|
641 | /*
|
---|
642 | * icmp6_error -- ICMP6 ã¨ã©ã¼éä¿¡é¢æ°
|
---|
643 | */
|
---|
644 |
|
---|
645 | void
|
---|
646 | icmp6_error (T_NET_BUF *input, uint8_t type, uint8_t code, uint32_t param)
|
---|
647 | {
|
---|
648 | T_NET_BUF *output;
|
---|
649 | T_IP6_HDR *ip6h;
|
---|
650 | T_ICMP6_HDR *icmp6h;
|
---|
651 | ER_UINT off;
|
---|
652 | uint_t next, len;
|
---|
653 |
|
---|
654 | ip6h = GET_IP6_HDR(input);
|
---|
655 |
|
---|
656 | /*
|
---|
657 | * å®å
|
---|
658 | ã¢ãã¬ã¹ãããã«ããã£ã¹ãã®å ´åã¯ã
|
---|
659 | * 以ä¸ã®æ¡ä»¶ä»¥å¤ã®ã¨ãã¯å¦çãè¡ããªãã
|
---|
660 | *
|
---|
661 | * ã»ãã¼ã¿ã°ã©ã ã大ããããã
|
---|
662 | * ã»IPv6 ãããã®ä¸æ£ã§ããªãã·ã§ã³ãèªèã§ããªãã
|
---|
663 | */
|
---|
664 | if (IN6_IS_ADDR_MULTICAST(&ip6h->dst) &&
|
---|
665 | !((type == ICMP6_PACKET_TOO_BIG) ||
|
---|
666 | (type == ICMP6_PARAM_PROB && code == ICMP6_PARAMPROB_OPTION)))
|
---|
667 | goto buf_rel;
|
---|
668 |
|
---|
669 | /*
|
---|
670 | * å§ç¹ã¢ãã¬ã¹ãã以ä¸ã®å ´åã¯å¦çãè¡ããªãã
|
---|
671 | *
|
---|
672 | * ã»ç¡æå®
|
---|
673 | * ã»ãã«ããã£ã¹ã
|
---|
674 | */
|
---|
675 | if (IN6_IS_ADDR_UNSPECIFIED(&ip6h->src) ||
|
---|
676 | IN6_IS_ADDR_MULTICAST (&ip6h->src))
|
---|
677 | goto buf_rel;
|
---|
678 |
|
---|
679 | /* æå¾ã®ããããæ¢ç´¢ããã*/
|
---|
680 | off = ip6_lasthdr(input, 0, IPPROTO_IPV6, &next);
|
---|
681 |
|
---|
682 | /*
|
---|
683 | * ã¿ã¤ãããã¨ã©ã¼ãåãç´ãã® ICMP6 ãã±ããã®ã¨ã©ã¼ã«ã¯è¿çããªãã
|
---|
684 | */
|
---|
685 | if (off >= 0 && next == IPPROTO_ICMPV6) {
|
---|
686 | T_ICMP6_HDR *icmp6h;
|
---|
687 |
|
---|
688 | if (input->len - off < ICMP6_HDR_SIZE)
|
---|
689 | goto buf_rel;
|
---|
690 |
|
---|
691 | icmp6h = GET_ICMP6_HDR(input, off);
|
---|
692 | if (icmp6h->type < ICMP6_ECHO_REQUEST ||
|
---|
693 | icmp6h->type == ND_REDIRECT)
|
---|
694 | goto buf_rel;
|
---|
695 | }
|
---|
696 |
|
---|
697 | /* DoS æ»æã«å¯¾ããé²å¾¡ã¯æªå®è£
|
---|
698 | */
|
---|
699 |
|
---|
700 | /*
|
---|
701 | * éãè¿ãã¡ãã»ã¼ã¸é·ããICMPv6 ã®æ大ãã¤ãã¼ãé·ã«èª¿æ´ããã
|
---|
702 | * IPV6_MMTU - (IP6_HDR_SIZE + ICMP6_HDR_SIZE)
|
---|
703 | */
|
---|
704 | if (input->len - IF_HDR_SIZE > IPV6_MMTU - (IP6_HDR_SIZE + ICMP6_HDR_SIZE))
|
---|
705 | len = IPV6_MMTU - (IP6_HDR_SIZE + ICMP6_HDR_SIZE);
|
---|
706 | else
|
---|
707 | len = input->len - IF_HDR_SIZE;
|
---|
708 |
|
---|
709 | /* éä¿¡ç¨ã®ãããã¯ã¼ã¯ãããã¡ãç²å¾ããã*/
|
---|
710 | if (in6_get_datagram(&output, len + ICMP6_HDR_SIZE, 0,
|
---|
711 | &ip6h->src, &in6_addr_unspecified,
|
---|
712 | IPPROTO_ICMPV6, IPV6_MAXHLIM,
|
---|
713 | NBA_SEARCH_ASCENT, TMO_ICMP_OUTPUT) != E_OK)
|
---|
714 | goto buf_rel;
|
---|
715 |
|
---|
716 | /* ICMP6 ããããè¨å®ããã*/
|
---|
717 | icmp6h = GET_ICMP6_HDR(output, IF_IP6_ICMP6_HDR_OFFSET);
|
---|
718 | icmp6h->type = type;
|
---|
719 | icmp6h->code = code;
|
---|
720 | icmp6h->icmp6_pptr = htonl(param);
|
---|
721 |
|
---|
722 | /* ã¨ã©ã¼ãã¼ã¿ãè¨å®ããã*/
|
---|
723 | memcpy(GET_ICMP6_SDU(output, IF_IP6_ICMP6_HDR_OFFSET), (uint8_t *)ip6h, len);
|
---|
724 |
|
---|
725 | #ifdef SUPPORT_MIB
|
---|
726 |
|
---|
727 | switch (type) {
|
---|
728 | case ICMP6_DST_UNREACH:
|
---|
729 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpOutDestUnreachs, 1);
|
---|
730 | break;
|
---|
731 |
|
---|
732 | case ICMP6_PARAM_PROB:
|
---|
733 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpOutParmProblems, 1);
|
---|
734 | break;
|
---|
735 |
|
---|
736 | default:
|
---|
737 | break;
|
---|
738 |
|
---|
739 | }
|
---|
740 |
|
---|
741 | #endif /* of #ifdef SUPPORT_MIB */
|
---|
742 |
|
---|
743 | /* éä¿¡ããã*/
|
---|
744 | icmp6_output(output, IF_IP6_HDR_SIZE);
|
---|
745 |
|
---|
746 | buf_rel:
|
---|
747 | syscall(rel_net_buf(input));
|
---|
748 | }
|
---|
749 |
|
---|
750 | #endif /* of #ifdef _IP6_CFG */
|
---|