[270] | 1 | /*
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| 2 | * TINET (TCP/IP Protocol Stack)
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| 3 | *
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| 4 | * Copyright (C) 2001-2009 by Dep. of Computer Science and Engineering
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| 5 | * Tomakomai National College of Technology, JAPAN
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| 6 | *
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| 7 | * ä¸è¨èä½æ¨©è
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| 8 | ã¯ï¼ä»¥ä¸ã® (1)ï½(4) ã®æ¡ä»¶ãï¼Free Software Foundation
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| 9 | * ã«ãã£ã¦å
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| 10 | ¬è¡¨ããã¦ãã GNU General Public License ã® Version 2 ã«è¨
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| 11 | * è¿°ããã¦ããæ¡ä»¶ãæºããå ´åã«éãï¼æ¬ã½ããã¦ã§ã¢ï¼æ¬ã½ããã¦ã§ã¢
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| 12 | * ãæ¹å¤ãããã®ãå«ãï¼ä»¥ä¸åãï¼ã使ç¨ã»è¤è£½ã»æ¹å¤ã»åé
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| 13 | å¸ï¼ä»¥ä¸ï¼
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| 14 | * å©ç¨ã¨å¼ã¶ï¼ãããã¨ãç¡åã§è¨±è«¾ããï¼
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| 15 | * (1) æ¬ã½ããã¦ã§ã¢ãã½ã¼ã¹ã³ã¼ãã®å½¢ã§å©ç¨ããå ´åã«ã¯ï¼ä¸è¨ã®èä½
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| 16 | * 権表示ï¼ãã®å©ç¨æ¡ä»¶ããã³ä¸è¨ã®ç¡ä¿è¨¼è¦å®ãï¼ãã®ã¾ã¾ã®å½¢ã§ã½ã¼
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| 17 | * ã¹ã³ã¼ãä¸ã«å«ã¾ãã¦ãããã¨ï¼
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| 18 | * (2) æ¬ã½ããã¦ã§ã¢ãï¼ã©ã¤ãã©ãªå½¢å¼ãªã©ï¼ä»ã®ã½ããã¦ã§ã¢éçºã«ä½¿
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| 19 | * ç¨ã§ããå½¢ã§åé
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| 20 | å¸ããå ´åã«ã¯ï¼åé
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| 21 | å¸ã«ä¼´ãããã¥ã¡ã³ãï¼å©ç¨
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| 22 | * è
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| 23 | ããã¥ã¢ã«ãªã©ï¼ã«ï¼ä¸è¨ã®èä½æ¨©è¡¨ç¤ºï¼ãã®å©ç¨æ¡ä»¶ããã³ä¸è¨
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| 24 | * ã®ç¡ä¿è¨¼è¦å®ãæ²è¼ãããã¨ï¼
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| 25 | * (3) æ¬ã½ããã¦ã§ã¢ãï¼æ©å¨ã«çµã¿è¾¼ããªã©ï¼ä»ã®ã½ããã¦ã§ã¢éçºã«ä½¿
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| 26 | * ç¨ã§ããªãå½¢ã§åé
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| 27 | å¸ããå ´åã«ã¯ï¼æ¬¡ã®æ¡ä»¶ãæºãããã¨ï¼
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| 28 | * (a) åé
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| 29 | å¸ã«ä¼´ãããã¥ã¡ã³ãï¼å©ç¨è
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| 30 | ããã¥ã¢ã«ãªã©ï¼ã«ï¼ä¸è¨ã®è
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| 31 | * ä½æ¨©è¡¨ç¤ºï¼ãã®å©ç¨æ¡ä»¶ããã³ä¸è¨ã®ç¡ä¿è¨¼è¦å®ãæ²è¼ãããã¨ï¼
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| 32 | * (4) æ¬ã½ããã¦ã§ã¢ã®å©ç¨ã«ããç´æ¥çã¾ãã¯éæ¥çã«çãããããªãæ
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| 33 | * 害ãããï¼ä¸è¨èä½æ¨©è
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| 34 | ããã³TOPPERSããã¸ã§ã¯ããå
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| 35 | 責ãããã¨ï¼
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| 36 | *
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| 37 | * æ¬ã½ããã¦ã§ã¢ã¯ï¼ç¡ä¿è¨¼ã§æä¾ããã¦ãããã®ã§ããï¼ä¸è¨èä½æ¨©è
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| 38 | ã
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| 39 | * ãã³TOPPERSããã¸ã§ã¯ãã¯ï¼æ¬ã½ããã¦ã§ã¢ã«é¢ãã¦ï¼ãã®é©ç¨å¯è½æ§ã
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| 40 | * å«ãã¦ï¼ãããªãä¿è¨¼ãè¡ããªãï¼ã¾ãï¼æ¬ã½ããã¦ã§ã¢ã®å©ç¨ã«ããç´
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| 41 | * æ¥çã¾ãã¯éæ¥çã«çãããããªãæ害ã«é¢ãã¦ãï¼ãã®è²¬ä»»ãè² ããªãï¼
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| 42 | *
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| 43 | * @(#) $Id: nd6_nbr.c 270 2017-02-09 04:03:47Z coas-nagasima $
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| 44 | */
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| 45 |
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| 46 | /* $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_var.h>
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| 108 | #include <net/net_buf.h>
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| 109 | #include <net/net_timer.h>
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| 110 | #include <net/net_count.h>
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| 111 |
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| 112 | #include <netinet/in.h>
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| 113 | #include <netinet/in_var.h>
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| 114 |
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| 115 | #include <netinet6/in6.h>
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| 116 | #include <netinet6/in6_var.h>
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| 117 | #include <netinet6/nd6.h>
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| 118 |
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| 119 | #include <netinet/ip6.h>
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| 120 | #include <netinet/icmp6.h>
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| 121 | #include <netinet6/ip6_var.h>
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| 122 |
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| 123 | #include <net/if6_var.h>
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| 124 |
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| 125 | #ifdef SUPPORT_INET6
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| 126 |
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| 127 | /*
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| 128 | * å±æé¢æ°
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| 129 | */
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| 130 |
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| 131 | static void nd6_dad_timer (T_IN6_IFADDR *ifa);
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| 132 | static void nd6_dad_duplicated (T_IFNET *ifp, T_IN6_IFADDR *ifa);
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| 133 | static void nd6_dad_ns_output (T_IFNET *ifp, T_IN6_IFADDR *ifa);
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| 134 | static void nd6_dad_ns_input (T_IFNET *ifp, T_IN6_IFADDR *ifa);
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| 135 | static void nd6_dad_na_input (T_IFNET *ifp, T_IN6_IFADDR *ifa);
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| 136 |
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| 137 | /*
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| 138 | * nd6_dad_duplicated -- éè¤ã¢ãã¬ã¹ãæ¤åºããæã®å¦ç
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| 139 | */
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| 140 |
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| 141 | static void
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| 142 | nd6_dad_duplicated (T_IFNET *ifp, T_IN6_IFADDR *ifa)
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| 143 | {
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| 144 | if ((ifa->flags & IN6_IFF_TENTATIVE) == 0)
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| 145 | syslog(LOG_ERROR, "[ND6 DAD DUP] no pending.");
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| 146 | else {
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| 147 | syslog(LOG_ERROR, "[ND6 DAD DUP] dup IPv6 addr: %s.", ipv62str(NULL, &ifa->addr));
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| 148 | ifa->flags &= ~IN6_IFF_TENTATIVE;
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| 149 | ifa->flags |= IN6_IFF_DUPLICATED;
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| 150 |
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| 151 | /* ã¿ã¤ãã¼ãåæ¢ããã*/
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| 152 | untimeout((callout_func)nd6_dad_timer, ifa);
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| 153 |
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| 154 | /*
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| 155 | * ãã IPv6 ã¢ãã¬ã¹ããã¦ãã¼ã¯ã«å²ãå½ã¦ãã
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| 156 | * ï¼ã¤ã¼ãµãããç¨ã® EUI-64ï¼ãã¼ãã¦ã§ã¢ã¢ãã¬ã¹ããã¼ã¹ã¨ãã
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| 157 | * ã¤ã³ã¿ãã§ã¼ã¹ ID ã§çæãããã®ã§ããã°ã
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| 158 | * ãã®ã¤ã³ã¿ãã§ã¼ã¹ã§ã® IPv6 ã®åä½ã¯ç¡å¹ã«ãã¹ãã§ãã
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| 159 | * ï¼RFC2462bis-03 ã»ã¯ã·ã§ã³ 5.4.5ï¼ã
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| 160 | */
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| 161 | if (IN6_IS_ADDR_LINKLOCAL(&ifa->addr))
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| 162 | ifp->flags |= ND6_IFF_IFDISABLED;
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| 163 | }
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| 164 | }
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| 165 |
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| 166 | /*
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| 167 | * nd6_dad_ns_output -- éè¤ã¢ãã¬ã¹æ¤åº (DAD) è¦è«ãåºåããã
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| 168 | */
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| 169 |
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| 170 | static void
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| 171 | nd6_dad_ns_output (T_IFNET *ifp, T_IN6_IFADDR *ifa)
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| 172 | {
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| 173 | NET_COUNT_ICMP6(net_count_nd6[NC_ND6_DAD_OUT_PACKETS], 1);
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| 174 |
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| 175 | ifa->ns_ocount ++;
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| 176 | nd6_ns_output(ifp, &in6_addr_unspecified, &ifa->addr, NULL, true);
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| 177 | }
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| 178 |
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| 179 | /*
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| 180 | * nd6_dad_ns_input -- éè¤ã¢ãã¬ã¹æ¤åº (DAD) è¦è«å
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| 181 | ¥å
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| 182 | */
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| 183 |
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| 184 | static void
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| 185 | nd6_dad_ns_input (T_IFNET *ifp, T_IN6_IFADDR *ifa)
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| 186 | {
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| 187 | NET_COUNT_ICMP6(net_count_nd6[NC_ND6_NS_IN_PACKETS], 1);
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| 188 |
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| 189 | /*
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| 190 | * ã¾ã ãéè¤ã¢ãã¬ã¹æ¤åºè¦è«ãåºåãã¦ããªãå ´å
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| 191 | */
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| 192 | if (ifa->ns_ocount == 0)
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| 193 | nd6_dad_duplicated(ifp, ifa);
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| 194 | else
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| 195 | ifa->ns_icount ++;
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| 196 | }
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| 197 |
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| 198 | /*
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| 199 | * nd6_dad_na_input -- éè¤ã¢ãã¬ã¹æ¤åº (DAD) éç¥å
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| 200 | ¥å
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| 201 | */
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| 202 |
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| 203 | static void
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| 204 | nd6_dad_na_input (T_IFNET *ifp, T_IN6_IFADDR *ifa)
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| 205 | {
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| 206 | NET_COUNT_ICMP6(net_count_nd6[NC_ND6_NA_IN_PACKETS], 1);
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| 207 | ifa->na_icount ++;
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| 208 | nd6_dad_duplicated(ifp, ifa);
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| 209 | }
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| 210 |
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| 211 | /*
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| 212 | * nd6_dad_timer -- éè¤ã¢ãã¬ã¹æ¤åº (DAD) ã¿ã¤ãã¼
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| 213 | */
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| 214 |
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| 215 | static void
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| 216 | nd6_dad_timer (T_IN6_IFADDR *ifa)
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| 217 | {
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| 218 | T_IFNET *ifp = IF_GET_IFNET();
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| 219 |
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| 220 | if (ifa->flags & IN6_IFF_DUPLICATED) {
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| 221 | syslog(LOG_ERROR, "[ND6 DAD] dup IPv6 addr: %s.", ipv62str(NULL, &ifa->addr));
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| 222 | return;
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| 223 | }
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| 224 |
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| 225 | if ((ifa->flags & IN6_IFF_TENTATIVE) == 0) {
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| 226 | syslog(LOG_ERROR, "[ND6 DAD] no tentative IPv6 addr: %s.", ipv62str(NULL, &ifa->addr));
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| 227 | return;
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| 228 | }
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| 229 |
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| 230 | if (ifa->ns_ocount < NUM_IP6_DAD_COUNT) {
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| 231 | nd6_dad_ns_output(ifp, ifa);
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| 232 |
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| 233 | /* ã¿ã¤ã ã¢ã¦ããè¿é£æ¢ç´¢ã®éä¿¡ééã«è¨å®ããã*/
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| 234 | timeout((callout_func)nd6_dad_timer, ifa, ND6_RETRANS_TIME * NET_TIMER_HZ / SYSTIM_HZ);
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| 235 | }
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| 236 | else if (ifa->na_icount || ifa->ns_icount)
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| 237 | nd6_dad_duplicated(ifp, ifa);
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| 238 | else {
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| 239 | ifa->flags &= ~IN6_IFF_TENTATIVE;
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| 240 | syslog(LOG_NOTICE, "[ND6 DAD] no dup IPv6 addr: %s.", ipv62str(NULL, &ifa->addr));
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| 241 | }
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| 242 | }
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| 243 |
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| 244 | /*
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| 245 | * nd6_ns_input -- è¿é£è¦è«ã®å
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| 246 | ¥åå¦çã
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| 247 | */
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| 248 |
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| 249 | void
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| 250 | nd6_ns_input (T_NET_BUF *input, uint_t off)
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| 251 | {
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| 252 | T_IFNET *ifp = IF_GET_IFNET();
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| 253 | T_IP6_HDR *ip6h;
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| 254 | T_NEIGHBOR_SOLICIT_HDR *nsh;
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| 255 | T_ND_OPT_HDR *opth;
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| 256 | T_IN6_IFADDR *ifa;
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| 257 | bool_t tlladdr;
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| 258 | uint_t lladdr_len = 0;
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| 259 | uint32_t flags;
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| 260 | uint8_t *lladdr = NULL;
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| 261 | uint8_t nd_opt_off[ND_OPT_OFF_ARRAY_SIZE];
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| 262 |
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| 263 | NET_COUNT_ICMP6(net_count_nd6[NC_ND6_NS_IN_PACKETS], 1);
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| 264 |
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| 265 | ip6h = GET_IP6_HDR(input);
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| 266 |
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| 267 | /*
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| 268 | * ãããã®ãã§ãã¯ã以ä¸ã®å ´åã¯ç ´æ£ããã
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| 269 | * ã»ããããªãããã IPV6_MAXHLIM (255) 以å¤
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| 270 | * ã»ãããé·ãçã
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| 271 | */
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| 272 | if (ip6h->hlim != IPV6_MAXHLIM || input->len - off < NEIGHBOR_SOLICIT_HDR_SIZE)
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| 273 | goto err_ret;
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| 274 |
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| 275 | nsh = (T_NEIGHBOR_SOLICIT_HDR *)(input->buf + off);
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| 276 |
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| 277 | if (IN6_IS_ADDR_UNSPECIFIED(&ip6h->src)) {
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| 278 | /*
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| 279 | * å§ç¹ã¢ãã¬ã¹ãç¡æå®ãªããéè¤ã¢ãã¬ã¹æ¤åº
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| 280 | * ãã¦å
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| 281 | ã¢ãã¬ã¹ã¯ãè¦è«ãã«ããã£ã¹ãã§ãªããã°ãªããªãã
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| 282 | */
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| 283 | if (!IN6_IS_ADDR_NS_MULTICAST(&ip6h->dst))
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| 284 | goto err_ret;
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| 285 | }
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| 286 |
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| 287 | /* ç®çã¢ãã¬ã¹ããã«ããã£ã¹ããªãã¨ã©ã¼ */
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| 288 | if (IN6_IS_ADDR_MULTICAST(&nsh->target))
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| 289 | goto err_ret;
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| 290 |
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| 291 | /* è¿é£æ¢ç´¢ãªãã·ã§ã³ã®ãªãã»ãããè¨é²ããã*/
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| 292 | if (nd6_options(nd_opt_off, input->buf + (off + NEIGHBOR_SOLICIT_HDR_SIZE),
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| 293 | input->len - (off + NEIGHBOR_SOLICIT_HDR_SIZE)) != E_OK)
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| 294 | goto err_ret;
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| 295 |
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| 296 | /* è¿é£æ¢ç´¢ãªãã·ã§ã³ (å§ç¹ãªã³ã¯ã¢ãã¬ã¹) */
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| 297 | if (nd_opt_off[ND_OPT_OFF_ARRAY_IX(ND_OPT_SOURCE_LINKADDR)]) {
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| 298 | opth = (T_ND_OPT_HDR *)((uint8_t *)(input->buf + off + NEIGHBOR_SOLICIT_HDR_SIZE) +
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| 299 | nd_opt_off[ND_OPT_OFF_ARRAY_IX(ND_OPT_SOURCE_LINKADDR)] - 8);
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| 300 | /* 注æ: ãªãã·ã§ã³ãªãã»ããé
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| 301 | åã«ã¯ããªãã»ãã + 8 ãè¨å®ããã¦ããã*/
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| 302 | lladdr = (uint8_t *)(opth + 1);
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| 303 | lladdr_len = (opth->len << 3);
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| 304 | }
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| 305 |
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| 306 | if (IN6_IS_ADDR_UNSPECIFIED(&ip6h->src) && lladdr != NULL)
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| 307 | goto err_ret;
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| 308 |
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| 309 | /* å®å
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| 310 | ã¢ãã¬ã¹ããã«ããã£ã¹ããªãè¿é£éç¥ã«ãã¼ã¿ãªã³ã¯å±¤ã®ã¢ãã¬ã¹ãä»ããã*/
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| 311 | if (IN6_IS_ADDR_MULTICAST(&ip6h->dst))
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| 312 | tlladdr = true;
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| 313 | else
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| 314 | tlladdr = false;
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| 315 |
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| 316 | /*
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| 317 | * ç®çã¢ãã¬ã¹ããèªåã®ãããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ã«
|
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| 318 | * å²ãå½ã¦ããã¦ããã¢ãã¬ã¹ã調ã¹ãã
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| 319 | * ãªãã代çãµã¼ãã¹ã¯å®è£
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| 320 | ãã¦ããªãã
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| 321 | */
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| 322 | ifa = in6_lookup_ifaddr(ifp, &nsh->target);
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| 323 |
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| 324 | if (ifa == NULL)
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| 325 | goto free_ret;
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| 326 |
|
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| 327 | /* æ¢ç´¢çµæã¢ãã¬ã¹ãéè¤ãã¦ããã°å¿çããªãã§çµäºããã*/
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| 328 | if (ifa->flags & IN6_IFF_DUPLICATED)
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| 329 | goto err_ret;
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| 330 |
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| 331 | /*
|
---|
| 332 | * ãããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ã®ã¢ãã¬ã¹é·ãä¸è´ããªããã°ã¨ã©ã¼
|
---|
| 333 | */
|
---|
| 334 | if (lladdr && lladdr_len != ((sizeof(T_IF_ADDR) + sizeof(T_ND_OPT_HDR) + 7) & ~7))
|
---|
| 335 | goto err_ret;
|
---|
| 336 |
|
---|
| 337 | /*
|
---|
| 338 | * å§ç¹ã¢ãã¬ã¹ãèªåã®ã¢ãã¬ã¹ã¨ä¸è´ããã°éè¤ãã¦ããã
|
---|
| 339 | */
|
---|
| 340 | if (IN6_ARE_ADDR_EQUAL(&ifa->addr, &ip6h->src))
|
---|
| 341 | goto free_ret;
|
---|
| 342 |
|
---|
| 343 | /* éè¤æ¤åºä¸ã«ãè¿é£è¦è«ãåä¿¡ããã¨ãã®å¦ç */
|
---|
| 344 | if (ifa->flags & IN6_IFF_TENTATIVE) {
|
---|
| 345 | if (IN6_IS_ADDR_UNSPECIFIED(&ip6h->src))
|
---|
| 346 | nd6_dad_ns_input(ifp, ifa);
|
---|
| 347 | goto free_ret;
|
---|
| 348 | }
|
---|
| 349 |
|
---|
| 350 | if ((ifa->flags & IN6_IFF_ANYCAST) || !tlladdr)
|
---|
| 351 | flags = 0;
|
---|
| 352 | else
|
---|
| 353 | flags = ND_NA_FLG_OVERRIDE;
|
---|
| 354 |
|
---|
| 355 | /*
|
---|
| 356 | * å§ç¹ã¢ãã¬ã¹ãç¡æå®ãªããéä¿¡ç¸æã¯éè¤ã¢ãã¬ã¹æ¤åºä¸ã§ã
|
---|
| 357 | * ç´æ¥éä¿¡ãããã¨ã¯ã§ããªãã®ã§ãå
|
---|
| 358 | ¨ãã¼ããã«ããã£ã¹ã
|
---|
| 359 | * ã¢ãã¬ã¹ã«éä¿¡ããã
|
---|
| 360 | */
|
---|
| 361 | if (IN6_IS_ADDR_UNSPECIFIED(&ip6h->src)) {
|
---|
| 362 | nd6_na_output(ifp, &in6_addr_linklocal_allnodes, &nsh->target, flags, tlladdr);
|
---|
| 363 | goto free_ret;
|
---|
| 364 | }
|
---|
| 365 |
|
---|
| 366 | /* è¿é£ãã£ãã·ã¥ã«ç»é²ããã*/
|
---|
| 367 | nd6_cache_lladdr(ifp, &ip6h->src, (T_IF_ADDR *)lladdr, ND_NEIGHBOR_SOLICIT, 0);
|
---|
| 368 |
|
---|
| 369 | nd6_na_output(ifp, &ip6h->src, &nsh->target, flags | ND_NA_FLG_SOLICITED, tlladdr);
|
---|
| 370 |
|
---|
| 371 | free_ret:
|
---|
| 372 | syscall(rel_net_buf(input));
|
---|
| 373 | return;
|
---|
| 374 |
|
---|
| 375 | err_ret:
|
---|
| 376 | NET_COUNT_ICMP6(net_count_nd6[NC_ICMP6_IN_ERR_PACKETS], 1);
|
---|
| 377 | syscall(rel_net_buf(input));
|
---|
| 378 | }
|
---|
| 379 |
|
---|
| 380 | /*
|
---|
| 381 | * nd6_ns_output -- è¿é£è¦è«ãåºåããã
|
---|
| 382 | */
|
---|
| 383 |
|
---|
| 384 | void
|
---|
| 385 | nd6_ns_output (T_IFNET *ifp, T_IN6_ADDR *daddr,
|
---|
| 386 | T_IN6_ADDR *taddr, T_LLINFO_ND6 *ln, bool_t dad)
|
---|
| 387 | {
|
---|
| 388 | T_NEIGHBOR_SOLICIT_HDR *nsh;
|
---|
| 389 | T_NET_BUF *output;
|
---|
| 390 | T_IP6_HDR *ip6h;
|
---|
| 391 | T_IF_ADDR *mac = NULL;
|
---|
| 392 | uint_t len;
|
---|
| 393 | uint16_t ipflags = 0;
|
---|
| 394 |
|
---|
| 395 | NET_COUNT_ICMP6(net_count_nd6[NC_ND6_NS_OUT_PACKETS], 1);
|
---|
| 396 |
|
---|
| 397 | if (IN6_IS_ADDR_MULTICAST(taddr))
|
---|
| 398 | return;
|
---|
| 399 |
|
---|
| 400 | /* è¿é£è¦è«ãã¤ãã¼ãé·ãè¨ç®ããã*/
|
---|
| 401 | if (!dad && IF_SOFTC_TO_IFADDR(ifp->ic))
|
---|
| 402 | len = (NEIGHBOR_SOLICIT_HDR_SIZE + ND_OPT_HDR_SIZE + sizeof(T_IF_ADDR) + 7) >> 3 << 3;
|
---|
| 403 | else
|
---|
| 404 | len = (NEIGHBOR_SOLICIT_HDR_SIZE + 7) >> 3 << 3;
|
---|
| 405 |
|
---|
| 406 | /*
|
---|
| 407 | * è¦è«ãã«ããã£ã¹ãã»ã¢ãã¬ã¹å®ã®è¿é£æ¢ç´¢ã§ã¯ã
|
---|
| 408 | * ä»ã®ãªã³ã¯ããã®å½é ããããã¼ã¿ã°ã©ã ã
|
---|
| 409 | * æé¤ãããããããããªãããã« IPV6_MAXHLIM (255) ãè¨å®ããã
|
---|
| 410 | */
|
---|
| 411 | if (IN6_IS_ADDR_UNSPECIFIED(daddr) || IN6_IS_ADDR_MULTICAST(daddr))
|
---|
| 412 | ipflags = IPV6_OUT_SET_HOP_LIMIT(IPV6_OUT_FLG_HOP_LIMIT, IPV6_MAXHLIM);
|
---|
| 413 |
|
---|
| 414 | /* ãããã¯ã¼ã¯ãããã¡ãç²å¾ããIPv6 ããããè¨å®ããã*/
|
---|
| 415 | if (in6_get_datagram(&output, len, 0, daddr, NULL,
|
---|
| 416 | IPPROTO_ICMPV6, IPV6_MAXHLIM,
|
---|
| 417 | NBA_SEARCH_ASCENT, TMO_ND6_NS_OUTPUT) != E_OK)
|
---|
| 418 | return;
|
---|
| 419 |
|
---|
| 420 | ip6h = GET_IP6_HDR(output);
|
---|
| 421 |
|
---|
| 422 | if (IN6_IS_ADDR_UNSPECIFIED(daddr)) {
|
---|
| 423 |
|
---|
| 424 | /* å®å
|
---|
| 425 | ã¢ãã¬ã¹ãç¡æå®ã®å ´åã¯ãè¦è«ãã«ããã£ã¹ãã¢ãã¬ã¹ãè¨å®ããã*/
|
---|
| 426 | ip6h->dst.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
|
---|
| 427 | ip6h->dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
|
---|
| 428 | ip6h->dst.s6_addr32[3] = taddr->s6_addr32[3];
|
---|
| 429 | ip6h->dst.s6_addr8[12] = 0xff;
|
---|
| 430 | }
|
---|
| 431 |
|
---|
| 432 | /* éä¿¡å
|
---|
| 433 | ã¢ãã¬ã¹ã®è¨å® */
|
---|
| 434 | if (!dad) {
|
---|
| 435 |
|
---|
| 436 | /* éè¤ã¢ãã¬ã¹æ¤åºã§ã¯ãªãæã®éä¿¡å
|
---|
| 437 | ã¢ãã¬ã¹æ±ºå®å¦çã*/
|
---|
| 438 | T_IN6_ADDR *saddr;
|
---|
| 439 |
|
---|
| 440 | if (ln && ln->hold) {
|
---|
| 441 | /*
|
---|
| 442 | * éä¿¡ããã³ãã£ã³ã°ããã¦ãããã¼ã¿ã°ã©ã ã®
|
---|
| 443 | * éä¿¡å
|
---|
| 444 | ã¢ãã¬ã¹ãå©ç¨ããã
|
---|
| 445 | */
|
---|
| 446 | if (ln->hold->len > IF_IP6_HDR_SIZE)
|
---|
| 447 | saddr = &GET_IP6_HDR(ln->hold)->src;
|
---|
| 448 | else
|
---|
| 449 | saddr = NULL;
|
---|
| 450 | }
|
---|
| 451 | else
|
---|
| 452 | saddr = NULL;
|
---|
| 453 |
|
---|
| 454 | if (saddr && in6_lookup_ifaddr(ifp, saddr))
|
---|
| 455 | ip6h->src = *saddr;
|
---|
| 456 | else {
|
---|
| 457 | /*
|
---|
| 458 | * å®å
|
---|
| 459 | ã¢ãã¬ã¹ã«ãµããããéä¿¡å
|
---|
| 460 | ã¢ãã¬ã¹ãã
|
---|
| 461 | * ãããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ããæ¢ç´¢ãã¦å©ç¨ããã
|
---|
| 462 | */
|
---|
| 463 | T_IN6_IFADDR *ifa;
|
---|
| 464 |
|
---|
| 465 | if ((ifa = in6_ifawithifp(ifp, &ip6h->dst)) == NULL) {
|
---|
| 466 | syscall(rel_net_buf(output));
|
---|
| 467 | return;
|
---|
| 468 | }
|
---|
| 469 | ip6h->src = ifa->addr;
|
---|
| 470 | }
|
---|
| 471 | }
|
---|
| 472 | else {
|
---|
| 473 |
|
---|
| 474 | /* éè¤ã¢ãã¬ã¹æ¤åºæã®éä¿¡å
|
---|
| 475 | ã¢ãã¬ã¹ã¯ç¡æå®ã*/
|
---|
| 476 | memset(&ip6h->src, 0, sizeof(T_IN6_ADDR));
|
---|
| 477 | }
|
---|
| 478 |
|
---|
| 479 | /* è¿é£è¦è«ããããè¨å®ããã*/
|
---|
| 480 | nsh = GET_NEIGHBOR_SOLICIT_HDR(output, IF_IP6_NEIGHBOR_SOLICIT_HDR_OFFSET);
|
---|
| 481 | nsh->hdr.type = ND_NEIGHBOR_SOLICIT;
|
---|
| 482 | nsh->hdr.code = 0;
|
---|
| 483 | nsh->hdr.data.data32 = 0;
|
---|
| 484 | nsh->target = *taddr;
|
---|
| 485 |
|
---|
| 486 | if (!dad && (mac = IF_SOFTC_TO_IFADDR(ifp->ic)) != NULL) {
|
---|
| 487 |
|
---|
| 488 | /* è¿é£æ¢ç´¢ãªãã·ã§ã³ã¨ãã¦ãæ¢ç´¢ç®æ¨ã® MAC ã¢ãã¬ã¹ãè¨å®ããã*/
|
---|
| 489 | T_ND_OPT_HDR *opth;
|
---|
| 490 | uint_t optlen;
|
---|
| 491 |
|
---|
| 492 | opth = (T_ND_OPT_HDR *)GET_NEIGHBOR_SOLICIT_SDU(output, IF_IP6_NEIGHBOR_SOLICIT_HDR_OFFSET);
|
---|
| 493 | optlen = (ND_OPT_HDR_SIZE + sizeof(T_IF_ADDR) + 7) >> 3 << 3;
|
---|
| 494 | memset(opth, 0, optlen);
|
---|
| 495 | opth->type = ND_OPT_SOURCE_LINKADDR;
|
---|
| 496 | opth->len = optlen >> 3;
|
---|
| 497 | memcpy((uint8_t *)opth + sizeof(T_ND_OPT_HDR), mac, sizeof(T_IF_ADDR));
|
---|
| 498 | }
|
---|
| 499 |
|
---|
| 500 | /* ãã§ãã¯ãµã ãè¨ç®ããã*/
|
---|
| 501 | nsh->hdr.sum = 0;
|
---|
| 502 | nsh->hdr.sum = in6_cksum(output, IPPROTO_ICMPV6, (uint8_t*)nsh - output->buf, len);
|
---|
| 503 |
|
---|
| 504 | /* éä¿¡ããã*/
|
---|
| 505 | NET_COUNT_ICMP6(net_count_nd6[NC_ICMP6_OUT_OCTETS],
|
---|
| 506 | output->len - GET_IF_IP6_HDR_SIZE(output));
|
---|
| 507 | NET_COUNT_ICMP6(net_count_nd6[NC_ICMP6_OUT_PACKETS], 1);
|
---|
| 508 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpOutMsgs, 1);
|
---|
| 509 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpOutNeighborSolicits, 1);
|
---|
| 510 | ip6_output(output, ipflags | IPV6_OUT_FLG_DAD, TMO_ND6_NS_OUTPUT);
|
---|
| 511 | }
|
---|
| 512 |
|
---|
| 513 | /*
|
---|
| 514 | * nd6_na_input -- è¿é£éç¥ã®å
|
---|
| 515 | ¥åå¦çã
|
---|
| 516 | */
|
---|
| 517 |
|
---|
| 518 | void
|
---|
| 519 | nd6_na_input (T_NET_BUF *input, uint_t off)
|
---|
| 520 | {
|
---|
| 521 | T_IFNET *ifp = IF_GET_IFNET();
|
---|
| 522 | T_IP6_HDR *ip6h;
|
---|
| 523 | T_NEIGHBOR_ADVERT_HDR *nah;
|
---|
| 524 | T_ND_OPT_HDR *opth;
|
---|
| 525 | T_IN6_IFADDR *ifa;
|
---|
| 526 | T_LLINFO_ND6 *ln;
|
---|
| 527 | SYSTIM now;
|
---|
| 528 | bool_t llchange;
|
---|
| 529 | uint_t lladdr_len = 0;
|
---|
| 530 | uint8_t *lladdr = NULL;
|
---|
| 531 | uint8_t nd_opt_off[ND_OPT_OFF_ARRAY_SIZE];
|
---|
| 532 |
|
---|
| 533 | NET_COUNT_ICMP6(net_count_nd6[NC_ND6_NS_IN_PACKETS], 1);
|
---|
| 534 |
|
---|
| 535 | ip6h = GET_IP6_HDR(input);
|
---|
| 536 |
|
---|
| 537 | /*
|
---|
| 538 | * ãããã®ãã§ãã¯ã以ä¸ã®å ´åã¯ç ´æ£ããã
|
---|
| 539 | * ã»ããããªãããã IPV6_MAXHLIM (255) 以å¤
|
---|
| 540 | * ã»ãããé·ãçã
|
---|
| 541 | */
|
---|
| 542 | if (ip6h->hlim != IPV6_MAXHLIM || input->len - off < NEIGHBOR_ADVERT_HDR_SIZE)
|
---|
| 543 | goto err_ret;
|
---|
| 544 |
|
---|
| 545 | nah = (T_NEIGHBOR_ADVERT_HDR *)(input->buf + off);
|
---|
| 546 |
|
---|
| 547 | /* ç®çã¢ãã¬ã¹ããã«ããã£ã¹ããªãã¨ã©ã¼ */
|
---|
| 548 | if (IN6_IS_ADDR_MULTICAST(&nah->target))
|
---|
| 549 | goto err_ret;
|
---|
| 550 |
|
---|
| 551 | /* è¿é£è¦è«ã¸ã®å¿çã§ãå®å
|
---|
| 552 | ã¢ãã¬ã¹ããã«ããã£ã¹ããªãã¨ã©ã¼ */
|
---|
| 553 | if ((nah->nd_na_flags_reserved & ND_NA_FLG_SOLICITED) &&
|
---|
| 554 | IN6_IS_ADDR_MULTICAST(&ip6h->dst))
|
---|
| 555 | goto err_ret;
|
---|
| 556 |
|
---|
| 557 | /* è¿é£æ¢ç´¢ãªãã·ã§ã³ã®ãªãã»ãããè¨é²ããã*/
|
---|
| 558 | if (nd6_options(nd_opt_off, input->buf + (off + NEIGHBOR_ADVERT_HDR_SIZE),
|
---|
| 559 | input->len - (off + NEIGHBOR_ADVERT_HDR_SIZE)) != E_OK)
|
---|
| 560 | goto err_ret;
|
---|
| 561 |
|
---|
| 562 | /* è¿é£æ¢ç´¢ãªãã·ã§ã³ (ç®çãªã³ã¯ã¢ãã¬ã¹) */
|
---|
| 563 | if (nd_opt_off[ND_OPT_OFF_ARRAY_IX(ND_OPT_TARGET_LINKADDR)]) {
|
---|
| 564 | opth = (T_ND_OPT_HDR *)((uint8_t *)(input->buf + off + NEIGHBOR_ADVERT_HDR_SIZE) +
|
---|
| 565 | nd_opt_off[ND_OPT_OFF_ARRAY_IX(ND_OPT_TARGET_LINKADDR)] - 8);
|
---|
| 566 | /* 注æ: ãªãã·ã§ã³ãªãã»ããé
|
---|
| 567 | åã«ã¯ããªãã»ãã + 8 ãè¨å®ããã¦ããã*/
|
---|
| 568 | lladdr = (uint8_t *)(opth + 1);
|
---|
| 569 | lladdr_len = (opth->len << 3);
|
---|
| 570 | }
|
---|
| 571 |
|
---|
| 572 | ifa = in6_lookup_ifaddr(ifp, &nah->target);
|
---|
| 573 |
|
---|
| 574 | /*
|
---|
| 575 | * ç®çã¢ãã¬ã¹ãèªåã®ãããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ã«å²ãå½ã¦ããã¦ããã¢ãã¬ã¹ã®
|
---|
| 576 | * ããããã«ä¸è´ããã¨ãã¯ãéè¤ãã¦ãããã¨ãæå³ãã¦ããã
|
---|
| 577 | */
|
---|
| 578 | if (ifa) {
|
---|
| 579 | if (ifa->flags & IN6_IFF_TENTATIVE)
|
---|
| 580 | nd6_dad_na_input(ifp, ifa);
|
---|
| 581 | else
|
---|
| 582 | syslog(LOG_ERROR, "[ND6 NA INPUT] dup IPv6 addr: %s.", ipv62str(NULL, &ifa->addr));
|
---|
| 583 | goto err_ret;
|
---|
| 584 | }
|
---|
| 585 |
|
---|
| 586 | /*
|
---|
| 587 | * ãããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ã®ã¢ãã¬ã¹é·ãä¸è´ããªããã°ã¨ã©ã¼
|
---|
| 588 | */
|
---|
| 589 | if (lladdr && lladdr_len != ((sizeof(T_IF_ADDR) + sizeof(T_ND_OPT_HDR) + 7) & ~7))
|
---|
| 590 | goto err_ret;
|
---|
| 591 |
|
---|
| 592 | /* è¿é£ãã£ãã·ã¥ãæ¢ç´¢ããã*/
|
---|
| 593 | syscall(wai_sem(SEM_ND6_CACHE));
|
---|
| 594 | if ((ln = nd6_lookup(&nah->target, false)) == NULL)
|
---|
| 595 | goto free_ret;
|
---|
| 596 |
|
---|
| 597 | /* è¿é£ãã£ãã·ã¥ã®ç¶æ
|
---|
| 598 | ãããã¼ã¿ãªã³ã¯å±¤ã®ã¢ãã¬ã¹æªè§£æ±ºã®å ´å */
|
---|
| 599 | if (ln->state == ND6_LLINFO_INCOMPLETE) {
|
---|
| 600 | /* éç¥ããããã¼ã¿ãªã³ã¯å±¤ã®ã¢ãã¬ã¹ã®é·ãã 0 ã®å ´å */
|
---|
| 601 | if (lladdr == NULL)
|
---|
| 602 | goto free_ret;
|
---|
| 603 |
|
---|
| 604 | ln->ifaddr = *(T_IF_ADDR *)lladdr;
|
---|
| 605 | if (nah->nd_na_flags_reserved & ND_NA_FLG_SOLICITED) {
|
---|
| 606 | ln->state = ND6_LLINFO_REACHABLE;
|
---|
| 607 | /*ln->byhint = 0*/;
|
---|
| 608 | if (ln->expire) {
|
---|
| 609 | syscall(get_tim(&now));
|
---|
| 610 | ln->expire = now + ND6_REACHABLE_TIME;
|
---|
| 611 | }
|
---|
| 612 | }
|
---|
| 613 | else {
|
---|
| 614 | syscall(get_tim(&now));
|
---|
| 615 | ln->expire = now + ND6_GCOLLECTION_TIME;
|
---|
| 616 | ln->state = ND6_LLINFO_STALE;
|
---|
| 617 | }
|
---|
| 618 |
|
---|
| 619 | if ((nah->nd_na_flags_reserved & ND_NA_FLG_ROUTER) != 0)
|
---|
| 620 | ln->flags |= ND6_LLIF_ROUTER;
|
---|
| 621 | else
|
---|
| 622 | ln->flags &= ~ND6_LLIF_ROUTER;
|
---|
| 623 | if ((ln->flags & ND6_LLIF_ROUTER) != 0)
|
---|
| 624 | /*pfxlist_onlink_check()*/;
|
---|
| 625 | }
|
---|
| 626 | else {
|
---|
| 627 | if (lladdr == NULL)
|
---|
| 628 | llchange = false;
|
---|
| 629 | else if (memcmp(lladdr, &ln->ifaddr, sizeof(T_IF_ADDR)))
|
---|
| 630 | llchange = true;
|
---|
| 631 | else
|
---|
| 632 | llchange = false;
|
---|
| 633 |
|
---|
| 634 | /*
|
---|
| 635 | * ç¶æ
|
---|
| 636 | é·ç§»è¡¨
|
---|
| 637 | *
|
---|
| 638 | * nd_na_flags_reserved
|
---|
| 639 | * OVERRIDE SOLICTED lladdr llchange å¦ç (L: lladdr ãç»é²ãã)
|
---|
| 640 | *
|
---|
| 641 | * F F N - (2c)
|
---|
| 642 | * F F Y F (2b) L
|
---|
| 643 | * F F Y T (1) REACHABLE -> STALE
|
---|
| 644 | * F T N - (2c) * -> REACHABLE
|
---|
| 645 | * F T Y F (2b) L * -> REACHABLE
|
---|
| 646 | * F T Y T (1) REACHABLE -> STALE
|
---|
| 647 | * T F N - (2a)
|
---|
| 648 | * T F Y F (2a) L
|
---|
| 649 | * T F Y T (2a) L *-> STALE
|
---|
| 650 | * T T N - (2a) * -> REACHABLE
|
---|
| 651 | * T T Y F (2a) L * -> REACHABLE
|
---|
| 652 | * T T Y T (2a) L * -> REACHABLE
|
---|
| 653 | */
|
---|
| 654 | if ((nah->nd_na_flags_reserved & ND_NA_FLG_OVERRIDE) == 0 && (lladdr != NULL && llchange)) { /* (1) */
|
---|
| 655 | /* ç¶æ
|
---|
| 656 | ã REACHABLE ãªã STALE ã«é·ç§»ããã*/
|
---|
| 657 | if (ln->state == ND6_LLINFO_REACHABLE) {
|
---|
| 658 | syscall(get_tim(&now));
|
---|
| 659 | ln->expire = now + ND6_GCOLLECTION_TIME;
|
---|
| 660 | ln->state = ND6_LLINFO_STALE;
|
---|
| 661 | }
|
---|
| 662 | goto free_ret;
|
---|
| 663 | }
|
---|
| 664 | else if ((nah->nd_na_flags_reserved & ND_NA_FLG_OVERRIDE) || /* (2a) */
|
---|
| 665 | ((nah->nd_na_flags_reserved & ND_NA_FLG_OVERRIDE) == 0 && (lladdr != NULL && !llchange)) || /* (2b) */
|
---|
| 666 | lladdr == NULL) { /* (2c) */
|
---|
| 667 |
|
---|
| 668 | /* ãã¼ã¿ãªã³ã¯å±¤ã®ã¢ãã¬ã¹ãéç¥ããã¦ããã°æ´æ°ããã*/
|
---|
| 669 | if (lladdr != NULL)
|
---|
| 670 | ln->ifaddr = *(T_IF_ADDR *)lladdr;
|
---|
| 671 |
|
---|
| 672 | /* è¿é£è¦è«ã¸ã®å¿çãªã REACHABLE ã«é·ç§»ããã*/
|
---|
| 673 | if (nah->nd_na_flags_reserved & ND_NA_FLG_SOLICITED) {
|
---|
| 674 | ln->state = ND6_LLINFO_REACHABLE;
|
---|
| 675 | /*ln->byhint = 0*/;
|
---|
| 676 | if (ln->expire) {
|
---|
| 677 | syscall(get_tim(&now));
|
---|
| 678 | ln->expire = now + ND6_REACHABLE_TIME;
|
---|
| 679 | }
|
---|
| 680 | }
|
---|
| 681 | /*
|
---|
| 682 | * ãã¼ã¿ãªã³ã¯å±¤ã®ã¢ãã¬ã¹ãéç¥ããã
|
---|
| 683 | * ç°ãªãã¢ãã¬ã¹ãªãæ´æ°ããã
|
---|
| 684 | */
|
---|
| 685 | else if (lladdr != NULL && llchange) {
|
---|
| 686 | syscall(get_tim(&now));
|
---|
| 687 | ln->expire = now + ND6_GCOLLECTION_TIME;
|
---|
| 688 | ln->state = ND6_LLINFO_STALE;
|
---|
| 689 | }
|
---|
| 690 | }
|
---|
| 691 |
|
---|
| 692 | /* ã«ã¼ã¿éç¥ãã©ã°ã®å¦ç */
|
---|
| 693 | if ((ln->flags & ND6_LLIF_ROUTER ) != 0 &&
|
---|
| 694 | (nah->nd_na_flags_reserved & ND_NA_FLG_ROUTER) == 0) {
|
---|
| 695 | /*
|
---|
| 696 | * éä¿¡ç¸æãã«ã¼ã¿éç¥ãã©ã°ãç¡å¹ã«ããå ´åã
|
---|
| 697 | * ãã£ãã©ã«ãã»ã«ã¼ã¿ãªã¹ããã対象ã®ã«ã¼ã¿ãåé¤ãã
|
---|
| 698 | * è¿é£æ¢ç´¢ãã£ãã·ã¥ãæ´æ°ããã
|
---|
| 699 | */
|
---|
| 700 | T_DEF_ROUTER *dr = NULL;
|
---|
| 701 |
|
---|
| 702 | syscall(wai_sem(SEM_ND6_DEFRTRLIST));
|
---|
| 703 | if ((dr = nd6_defrtrlist_lookup(&ln->addr)) != NULL) {
|
---|
| 704 | nd6_defrtrlist_del(dr);
|
---|
| 705 | }
|
---|
| 706 | syscall(sig_sem(SEM_ND6_DEFRTRLIST));
|
---|
| 707 | }
|
---|
| 708 | if ((nah->nd_na_flags_reserved & ND_NA_FLG_ROUTER) != 0)
|
---|
| 709 | ln->flags |= ND6_LLIF_ROUTER;
|
---|
| 710 | else
|
---|
| 711 | ln->flags &= ~ND6_LLIF_ROUTER;
|
---|
| 712 | }
|
---|
| 713 |
|
---|
| 714 | ln->asked = 0;
|
---|
| 715 |
|
---|
| 716 | /* ã¢ãã¬ã¹è§£æ±ºå¾
|
---|
| 717 | ã¡ã®ãã¼ã¿ã°ã©ã ãããã°éä¿¡ããã*/
|
---|
| 718 | nd6_output_hold(ifp, ln);
|
---|
| 719 |
|
---|
| 720 | free_ret:
|
---|
| 721 | syscall(sig_sem(SEM_ND6_CACHE));
|
---|
| 722 | syscall(rel_net_buf(input));
|
---|
| 723 | return;
|
---|
| 724 |
|
---|
| 725 | err_ret:
|
---|
| 726 | NET_COUNT_ICMP6(net_count_nd6[NC_ICMP6_IN_ERR_PACKETS], 1);
|
---|
| 727 | syscall(rel_net_buf(input));
|
---|
| 728 | }
|
---|
| 729 |
|
---|
| 730 | /*
|
---|
| 731 | * nd6_na_output -- è¿é£éç¥ãåºåããã
|
---|
| 732 | */
|
---|
| 733 |
|
---|
| 734 | void
|
---|
| 735 | nd6_na_output (T_IFNET *ifp, T_IN6_ADDR *daddr,
|
---|
| 736 | T_IN6_ADDR *taddr, uint32_t flags, bool_t tlladdr)
|
---|
| 737 | {
|
---|
| 738 | T_NEIGHBOR_ADVERT_HDR *nah;
|
---|
| 739 | T_NET_BUF *output;
|
---|
| 740 | T_IP6_HDR *ip6h;
|
---|
| 741 | T_IN6_IFADDR *ifa;
|
---|
| 742 | T_IF_ADDR *mac = NULL;
|
---|
| 743 | uint_t len;
|
---|
| 744 | uint16_t ipflags = 0;
|
---|
| 745 |
|
---|
| 746 | NET_COUNT_ICMP6(net_count_nd6[NC_ND6_NA_OUT_PACKETS], 1);
|
---|
| 747 |
|
---|
| 748 | /*
|
---|
| 749 | * è¿é£éç¥ãã¤ãã¼ãé·ãè¨ç®ããã
|
---|
| 750 | * tlladdr ãçãªããããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ã®ã¢ãã¬ã¹ã追å ããã
|
---|
| 751 | */
|
---|
| 752 | if (tlladdr && IF_SOFTC_TO_IFADDR(ifp->ic))
|
---|
| 753 | len = (NEIGHBOR_ADVERT_HDR_SIZE + ND_OPT_HDR_SIZE + sizeof(T_IF_ADDR) + 7) >> 3 << 3;
|
---|
| 754 | else
|
---|
| 755 | len = (NEIGHBOR_ADVERT_HDR_SIZE + 7) >> 3 << 3;
|
---|
| 756 |
|
---|
| 757 | /*
|
---|
| 758 | * ä»ã®ãªã³ã¯ããã®å½é ããããã¼ã¿ã°ã©ã ã
|
---|
| 759 | * æé¤ãããããããããªãããã« IPV6_MAXHLIM (255) ãè¨å®ããã
|
---|
| 760 | */
|
---|
| 761 | ipflags = IPV6_OUT_SET_HOP_LIMIT(IPV6_OUT_FLG_HOP_LIMIT, IPV6_MAXHLIM);
|
---|
| 762 |
|
---|
| 763 | /* ãããã¯ã¼ã¯ãããã¡ãç²å¾ããIPv6 ããããè¨å®ããã*/
|
---|
| 764 | if (in6_get_datagram(&output, len, 0, daddr, NULL,
|
---|
| 765 | IPPROTO_ICMPV6, IPV6_MAXHLIM,
|
---|
| 766 | NBA_SEARCH_ASCENT, TMO_ND6_NA_OUTPUT) != E_OK)
|
---|
| 767 | return;
|
---|
| 768 |
|
---|
| 769 | ip6h = GET_IP6_HDR(output);
|
---|
| 770 |
|
---|
| 771 | if (IN6_IS_ADDR_UNSPECIFIED(daddr)) {
|
---|
| 772 | /*
|
---|
| 773 | * å®å
|
---|
| 774 | ã¢ãã¬ã¹ãç¡æå®ã®å ´åã¯ã
|
---|
| 775 | * ãªã³ã¯ãã¼ã«ã«å
|
---|
| 776 | ¨ãã¼ãã»ãã«ããã£ã¹ãã¢ãã¬ã¹ãè¨å®ããã
|
---|
| 777 | */
|
---|
| 778 | ip6h->dst.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
|
---|
| 779 | ip6h->dst.s6_addr32[1] = 0;
|
---|
| 780 | ip6h->dst.s6_addr32[2] = 0;
|
---|
| 781 | ip6h->dst.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
|
---|
| 782 | flags &= ~ND_NA_FLG_SOLICITED;
|
---|
| 783 | }
|
---|
| 784 | else
|
---|
| 785 | ip6h->dst = *daddr;
|
---|
| 786 |
|
---|
| 787 | /*
|
---|
| 788 | * å®å
|
---|
| 789 | ã¢ãã¬ã¹ã«ãµããããéä¿¡å
|
---|
| 790 | ã¢ãã¬ã¹ãã
|
---|
| 791 | * ãããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ããæ¢ç´¢ãã¦å©ç¨ããã
|
---|
| 792 | */
|
---|
| 793 | if ((ifa = in6_ifawithifp(ifp, &ip6h->dst)) == NULL) {
|
---|
| 794 | syscall(rel_net_buf(output));
|
---|
| 795 | return;
|
---|
| 796 | }
|
---|
| 797 | ip6h->src = ifa->addr;
|
---|
| 798 |
|
---|
| 799 | /* è¿é£éç¥ããããè¨å®ããã*/
|
---|
| 800 | nah = GET_NEIGHBOR_ADVERT_HDR(output, IF_IP6_NEIGHBOR_ADVERT_HDR_OFFSET);
|
---|
| 801 | nah->hdr.type = ND_NEIGHBOR_ADVERT;
|
---|
| 802 | nah->hdr.code = 0;
|
---|
| 803 | nah->target = *taddr;
|
---|
| 804 |
|
---|
| 805 | /* tlladdr ãçãªããããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ã®ã¢ãã¬ã¹ã追å ããã*/
|
---|
| 806 | if (tlladdr && (mac = IF_SOFTC_TO_IFADDR(ifp->ic)) != NULL) {
|
---|
| 807 |
|
---|
| 808 | T_ND_OPT_HDR *opth;
|
---|
| 809 | uint_t optlen;
|
---|
| 810 |
|
---|
| 811 | opth = (T_ND_OPT_HDR *)GET_NEIGHBOR_ADVERT_SDU(output, IF_IP6_NEIGHBOR_ADVERT_HDR_OFFSET);
|
---|
| 812 | optlen = (ND_OPT_HDR_SIZE + sizeof(T_IF_ADDR) + 7) >> 3 << 3;
|
---|
| 813 | memset(opth, 0, optlen);
|
---|
| 814 | opth->type = ND_OPT_TARGET_LINKADDR;
|
---|
| 815 | opth->len = optlen >> 3;
|
---|
| 816 | memcpy((uint8_t *)opth + sizeof(T_ND_OPT_HDR), mac, sizeof(T_IF_ADDR));
|
---|
| 817 | }
|
---|
| 818 | else
|
---|
| 819 | flags &= ~ND_NA_FLG_OVERRIDE;
|
---|
| 820 |
|
---|
| 821 | nah->nd_na_flags_reserved = flags;
|
---|
| 822 |
|
---|
| 823 | /* ãã§ãã¯ãµã ãè¨ç®ããã*/
|
---|
| 824 | nah->hdr.sum = 0;
|
---|
| 825 | nah->hdr.sum = in6_cksum(output, IPPROTO_ICMPV6, (uint8_t*)nah - output->buf, len);
|
---|
| 826 |
|
---|
| 827 | /* éä¿¡ããã*/
|
---|
| 828 | NET_COUNT_ICMP6(net_count_nd6[NC_ICMP6_OUT_OCTETS],
|
---|
| 829 | output->len - GET_IF_IP6_HDR_SIZE(output));
|
---|
| 830 | NET_COUNT_ICMP6(net_count_nd6[NC_ICMP6_OUT_PACKETS], 1);
|
---|
| 831 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpOutMsgs, 1);
|
---|
| 832 | NET_COUNT_MIB(icmp6_ifstat.ipv6IfIcmpOutNeighborAdvertisements, 1);
|
---|
| 833 | ip6_output(output, ipflags, TMO_ND6_NS_OUTPUT);
|
---|
| 834 | }
|
---|
| 835 |
|
---|
| 836 | /*
|
---|
| 837 | * nd6_dad_start -- éè¤ã¢ãã¬ã¹æ¤åº (DAD) ãéå§ããã
|
---|
| 838 | *
|
---|
| 839 | * 第3å¼æ°ã®tick ã¯ãã¤ã³ã¿ãã§ã¼ã¹ãèµ·åããã¦ãããéè¤æ¤åºã
|
---|
| 840 | * éä¿¡ããã¾ã§ã®æå°é
|
---|
| 841 | 延å¤ã§ããã
|
---|
| 842 | */
|
---|
| 843 |
|
---|
| 844 | void
|
---|
| 845 | nd6_dad_start (T_IFNET *ifp, T_IN6_IFADDR *ifa, int_t *tick)
|
---|
| 846 | {
|
---|
| 847 | /* ãã©ã°ããã§ãã¯ããã*/
|
---|
| 848 | if (!(ifa->flags & IN6_IFF_TENTATIVE))
|
---|
| 849 | return;
|
---|
| 850 |
|
---|
| 851 | #if NUM_IP6_DAD_COUNT == 0
|
---|
| 852 |
|
---|
| 853 | ifa->flags &= ~IN6_IFF_TENTATIVE;
|
---|
| 854 |
|
---|
| 855 | #else /* of #if NUM_IP6_DAD_COUNT == 0 */
|
---|
| 856 |
|
---|
| 857 | if (ifa->flags & IN6_IFF_ANYCAST) {
|
---|
| 858 | ifa->flags &= ~IN6_IFF_TENTATIVE;
|
---|
| 859 | return;
|
---|
| 860 | }
|
---|
| 861 | else if ((ifa->flags & IN6_IFF_TENTATIVE) == 0)
|
---|
| 862 | return;
|
---|
| 863 |
|
---|
| 864 | /* éè¤ã¢ãã¬ã¹æ¤åºã«ã¦ã³ã¿ããªã»ããããã*/
|
---|
| 865 | ifa->ns_icount = ifa->na_icount = ifa->ns_ocount = 0;
|
---|
| 866 |
|
---|
| 867 | /*
|
---|
| 868 | * éè¤ã¢ãã¬ã¹æ¤åºè¦è«ãéä¿¡ããããã ããã¤ã³ã¿ãã§ã¼ã¹ã
|
---|
| 869 | * åæåããç´å¾ã«ãæåã«éä¿¡ããå ´åã¯ãã©ã³ãã ãªé
|
---|
| 870 | 延ãè¡ãã
|
---|
| 871 | */
|
---|
| 872 | if (tick == NULL) {
|
---|
| 873 | nd6_dad_ns_output(ifp, ifa);
|
---|
| 874 |
|
---|
| 875 | /* ã¿ã¤ã ã¢ã¦ããè¿é£æ¢ç´¢ã®éä¿¡ééã«è¨å®ããã*/
|
---|
| 876 | timeout((callout_func)nd6_dad_timer, ifa, ND6_RETRANS_TIME * NET_TIMER_HZ / SYSTIM_HZ);
|
---|
| 877 | }
|
---|
| 878 | else {
|
---|
| 879 | int_t ntick;
|
---|
| 880 |
|
---|
| 881 | if (*tick == 0) /* æåã®éä¿¡ */
|
---|
| 882 | ntick = net_rand() % (ND6_FIRST_DAD_DELAY_TIME * NET_TIMER_HZ / SYSTIM_HZ);
|
---|
| 883 | else
|
---|
| 884 | ntick = *tick + net_rand() % (ND6_DAD_DELAY_TIME * NET_TIMER_HZ / SYSTIM_HZ);
|
---|
| 885 | *tick = ntick;
|
---|
| 886 | timeout((callout_func)nd6_dad_timer, ifa, ntick);
|
---|
| 887 | }
|
---|
| 888 |
|
---|
| 889 | #endif /* of #if NUM_IP6_DAD_COUNT == 0 */
|
---|
| 890 |
|
---|
| 891 | }
|
---|
| 892 |
|
---|
| 893 | #endif /* of #ifdef SUPPORT_INET6 */
|
---|