[388] | 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: if_ether.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 | /*
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| 47 | * Copyright (c) 1982, 1986, 1988, 1993
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| 48 | * The Regents of the University of California. All rights reserved.
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| 49 | *
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| 50 | * Redistribution and use in source and binary forms, with or without
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| 51 | * modification, are permitted provided that the following conditions
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| 52 | * are met:
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| 53 | * 1. Redistributions of source code must retain the above copyright
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| 54 | * notice, this list of conditions and the following disclaimer.
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| 55 | * 2. Redistributions in binary form must reproduce the above copyright
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| 56 | * notice, this list of conditions and the following disclaimer in the
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| 57 | * documentation and/or other materials provided with the distribution.
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| 58 | * 3. All advertising materials mentioning features or use of this software
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| 59 | * must display the following acknowledgement:
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| 60 | * This product includes software developed by the University of
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| 61 | * California, Berkeley and its contributors.
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| 62 | * 4. Neither the name of the University nor the names of its contributors
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| 63 | * may be used to endorse or promote products derived from this software
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| 64 | * without specific prior written permission.
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| 65 | *
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| 66 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 67 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 68 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 69 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 70 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 71 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 72 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 73 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 74 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 75 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 76 | * SUCH DAMAGE.
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| 77 | *
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| 78 | * @(#)if_ether.c 8.1 (Berkeley) 6/10/93
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| 79 | * $FreeBSD: src/sys/netinet/if_ether.c,v 1.52.2.6 1999/10/18 11:59:31 sheldonh Exp $
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| 80 | */
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| 81 |
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| 82 | #include <string.h>
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| 83 |
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| 84 | #ifdef TARGET_KERNEL_ASP
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| 85 |
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| 86 | #include <kernel.h>
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| 87 | #include <sil.h>
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| 88 | #include <t_syslog.h>
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| 89 | #include "kernel_cfg.h"
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| 90 |
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| 91 | #endif /* of #ifdef TARGET_KERNEL_ASP */
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| 92 |
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| 93 | #ifdef TARGET_KERNEL_JSP
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| 94 |
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| 95 | #include <s_services.h>
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| 96 | #include <t_services.h>
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| 97 | #include "kernel_id.h"
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| 98 |
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| 99 | #endif /* of #ifdef TARGET_KERNEL_JSP */
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| 100 |
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| 101 | #include <tinet_defs.h>
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| 102 | #include <tinet_config.h>
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| 103 |
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| 104 | #include <net/if.h>
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| 105 | #include <net/ethernet.h>
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| 106 | #include <net/if_arp.h>
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| 107 | #include <net/net.h>
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| 108 | #include <net/net_endian.h>
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| 109 | #include <net/net_buf.h>
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| 110 | #include <net/net_var.h>
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| 111 | #include <net/net_timer.h>
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| 112 | #include <net/net_count.h>
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| 113 |
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| 114 | #include <netinet/in.h>
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| 115 | #include <netinet/in_var.h>
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| 116 | #include <netinet/ip.h>
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| 117 | #include <netinet/if_ether.h>
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| 118 |
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| 119 | #include <net/if_var.h>
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| 120 |
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| 121 | #if defined(_IP4_CFG) && defined(SUPPORT_ETHER)
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| 122 |
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| 123 | /*
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| 124 | * ARP ãã£ãã·ã¥ã¨ã³ããª
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| 125 | */
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| 126 |
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| 127 | static T_ARP_ENTRY arp_cache[NUM_ARP_ENTRY];
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| 128 |
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| 129 | /*
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| 130 | * é¢æ°
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| 131 | */
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| 132 |
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| 133 | static void in_arpinput (T_IF_ADDR *ifaddr, T_NET_BUF *input);
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| 134 | static void arp_timer (void *ignore);
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| 135 |
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| 136 | /*
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| 137 | * in_arpinput -- TCP/IP ç¨ ARP ã®å
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| 138 | ¥åé¢æ°
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| 139 | */
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| 140 |
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| 141 | static void
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| 142 | in_arpinput (T_IF_ADDR *ifaddr, T_NET_BUF *input)
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| 143 | {
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| 144 | T_NET_BUF *pending;
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| 145 | T_ETHER_HDR *eth;
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| 146 | T_ARP_HDR *arph;
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| 147 | T_ETHER_ARP_HDR *et_arph;
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| 148 | T_ARP_ENTRY *ent;
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| 149 | T_IFNET *ifp = IF_GET_IFNET();
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| 150 | T_IN4_ADDR saddr, taddr;
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| 151 |
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| 152 | et_arph = GET_ETHER_ARP_HDR(input);
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| 153 |
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| 154 | ntoahl(saddr, et_arph->sproto); /* éä¿¡å
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| 155 | IP ã¢ãã¬ã¹ */
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| 156 | ntoahl(taddr, et_arph->tproto); /* 解決対象 IP ã¢ãã¬ã¹ */
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| 157 |
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| 158 | /*
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| 159 | * 以ä¸ã®å ´åã¯ã¨ã©ã¼
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| 160 | * ã»éä¿¡ãã¹ãã®ç©çã¢ãã¬ã¹ãèªå
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| 161 | * ã»éä¿¡ãã¹ãã®ç©çã¢ãã¬ã¹ãããã¼ããã£ã¹ã
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| 162 | */
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| 163 | if (memcmp(et_arph->shost, ifaddr->lladdr, ETHER_ADDR_LEN) == 0 ||
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| 164 | memcmp(et_arph->shost, ether_broad_cast_addr, ETHER_ADDR_LEN) == 0)
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| 165 | goto err_ret;
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| 166 |
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| 167 | /*
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| 168 | * éä¿¡ãã¹ãã® IP ã¢ãã¬ã¹ãèªåã®å ´åã¯ãéè¤ãã¦ããã®ã§
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| 169 | * ç¸æã«ãç¥ãããã
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| 170 | * ãã ããèªåã¨ç¸æã®ã¢ãã¬ã¹ãæªå®ç¾©ï¼IPV4_ADDRANYï¼ã®æã¯ä½ãããªãã
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| 171 | */
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| 172 | if ((saddr == ifp->in4_ifaddr.addr) && (saddr != IPV4_ADDRANY)) {
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| 173 |
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| 174 | #ifdef ARP_CFG_CALLBACK_DUPLICATED
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| 175 |
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| 176 | if (arp_callback_duplicated(et_arph->shost)) {
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| 177 | syslog(LOG_ERROR, "[ARP] IP address duplicated: %s",
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| 178 | ip2str(NULL, &ifp->in4_ifaddr.addr),
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| 179 | mac2str(NULL, et_arph->shost));
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| 180 | taddr = saddr;
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| 181 | goto reply;
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| 182 | }
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| 183 | else
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| 184 | goto buf_rel;
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| 185 |
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| 186 | #else /* of #ifdef ARP_CFG_CALLBACK_DUPLICATED */
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| 187 |
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| 188 | syslog(LOG_ERROR, "[ARP] IP address duplicated: %s",
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| 189 | ip2str(NULL, &ifp->in4_ifaddr.addr),
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| 190 | mac2str(NULL, et_arph->shost));
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| 191 | taddr = saddr;
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| 192 | goto reply;
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| 193 |
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| 194 | #endif /* of #ifdef ARP_CFG_CALLBACK_DUPLICATED */
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| 195 |
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| 196 | }
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| 197 |
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| 198 | /*
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| 199 | * 以ä¸ã®å ´åã¯ä½ãããªãã
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| 200 | * ã»è§£æ±ºå¯¾è±¡ IP ã¢ãã¬ã¹ãèªåã§ã¯ãªãã注: å
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| 201 | ã® FreeBSD ã®
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| 202 | * å®è£
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| 203 | ã§ã¯ãARP PROXY çã®ãããèªå以å¤ã® IP ã¢ãã¬ã¹ã®
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| 204 | * 解決ãè¡ã£ã¦ããããæ¬å®è£
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| 205 | ã§ã¯ãèªå以å¤ã® IP
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| 206 | * ã¢ãã¬ã¹ã®è§£æ±ºã¯è¡ããªãã
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| 207 | */
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| 208 | if (taddr != ifp->in4_ifaddr.addr)
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| 209 | goto buf_rel;
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| 210 |
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| 211 | /*
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| 212 | * éä¿¡å
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| 213 | IP ã¢ãã¬ã¹ã ARP ãã£ãã·ã¥ã«ããã調ã¹ãã
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| 214 | * ãã£ãã·ã¥ã«ãªããã°ãæ°ãã«ã¨ã³ããªãç»é²ããã
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| 215 | */
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| 216 | syscall(wai_sem(SEM_ARP_CACHE_LOCK));
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| 217 | ent = arp_lookup(saddr, true);
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| 218 |
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| 219 | memcpy(ent->mac_addr, et_arph->shost, ETHER_ADDR_LEN);
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| 220 | ent->expire = ARP_CACHE_KEEP;
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| 221 |
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| 222 | /*
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| 223 | * éä¿¡ããã³ãã³ã°ããã¦ãããã¬ã¼ã ãããã°éä¿¡ããã
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| 224 | */
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| 225 | if (ent->hold) {
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| 226 |
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| 227 | /* ãã¬ã¼ã ã® Ethernet ããããè¨å®ããã*/
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| 228 | memcpy(GET_ETHER_HDR(ent->hold)->dhost, ent->mac_addr, ETHER_ADDR_LEN);
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| 229 |
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| 230 | pending = ent->hold;
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| 231 | ent->hold = NULL;
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| 232 | syscall(sig_sem(SEM_ARP_CACHE_LOCK));
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| 233 |
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| 234 | /* ãã³ãã£ã³ã°ããã¦ãããã¬ã¼ã ãéä¿¡ããã*/
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| 235 | IF_RAW_OUTPUT(pending, TMO_FEVR);
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| 236 |
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| 237 | }
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| 238 | else
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| 239 | syscall(sig_sem(SEM_ARP_CACHE_LOCK));
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| 240 |
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| 241 | reply:
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| 242 |
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| 243 | arph = GET_ARP_HDR(input);
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| 244 |
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| 245 | /* ã¢ãã¬ã¹è§£æ±ºè¦æ±ã§ãªããã°çµäº */
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| 246 | if (ntohs(arph->opcode) != ARPOP_REQUEST)
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| 247 | goto buf_rel;
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| 248 |
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| 249 | /* Ethernet ARP ããããè¨å®ããã*/
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| 250 | memcpy(et_arph->thost, et_arph->shost, ETHER_ADDR_LEN);
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| 251 | memcpy(et_arph->shost, ifaddr->lladdr, ETHER_ADDR_LEN);
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| 252 | memcpy(et_arph->tproto, (uint8_t*)&et_arph->sproto, sizeof(T_IN_ADDR));
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| 253 | ahtonl(et_arph->sproto, taddr);
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| 254 |
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| 255 | /* Ethernet ARP ããããè¨å®ããã*/
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| 256 | arph->opcode = htons(ARPOP_REPLY);
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| 257 |
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| 258 | /* Ethernet ããããè¨å®ããã*/
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| 259 | eth = GET_ETHER_HDR(input);
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| 260 | memcpy(eth->dhost, eth->shost, ETHER_ADDR_LEN);
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| 261 | memcpy(eth->shost, ifaddr->lladdr, ETHER_ADDR_LEN);
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| 262 |
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| 263 | /* ARP å¿çãéä¿¡ããã*/
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| 264 | IF_RAW_OUTPUT(input, TMO_FEVR);
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| 265 | return;
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| 266 |
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| 267 | err_ret:
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| 268 | NET_COUNT_ARP(net_count_arp.in_err_packets, 1);
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| 269 | buf_rel:
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| 270 | syscall(rel_net_buf(input));
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| 271 | }
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| 272 |
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| 273 | /*
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| 274 | * arp_timer -- ARP ãã£ãã·ã¥ã®æ´æ°
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| 275 | */
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| 276 |
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| 277 | static void
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| 278 | arp_timer (void *ignore)
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| 279 | {
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| 280 | int_t ix;
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| 281 |
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| 282 | syscall(wai_sem(SEM_ARP_CACHE_LOCK));
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| 283 |
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| 284 | for (ix = NUM_ARP_ENTRY; ix -- > 0; ) {
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| 285 | if (arp_cache[ix].expire) {
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| 286 | arp_cache[ix].expire -= ARP_TIMER_TMO;
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| 287 | if (arp_cache[ix].expire == 0) {
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| 288 | /* éä¿¡ããã³ãã³ã°ããã¦ãããã¬ã¼ã ãããã°æ¨ã¦ãã*/
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| 289 | if (arp_cache[ix].hold) {
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| 290 | NET_COUNT_IP4(net_count_ip4[NC_IP4_OUT_ERR_PACKETS], 1);
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| 291 | syscall(rel_net_buf(arp_cache[ix].hold));
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| 292 | }
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| 293 | memset(&arp_cache[ix], 0, sizeof(T_ARP_ENTRY));
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| 294 | }
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| 295 | }
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| 296 | }
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| 297 |
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| 298 | syscall(sig_sem(SEM_ARP_CACHE_LOCK));
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| 299 | timeout(arp_timer, NULL, ARP_TIMER_TMO);
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| 300 | }
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| 301 |
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| 302 | /*
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| 303 | * arp_lookup -- ARP ãã£ãã·ã¥ã®æ¢ç´¢ã¨ç»é²
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| 304 | *
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| 305 | * 注æ: SEM_ARP_CACHE_LOCK ãç²å¾ããç¶æ
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| 306 | ã§å¼åºããã¨
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| 307 | */
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| 308 |
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| 309 | T_ARP_ENTRY *
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| 310 | arp_lookup (T_IN4_ADDR addr, bool_t create)
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| 311 | {
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| 312 | int_t ix, six;
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| 313 | uint16_t min;
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| 314 |
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| 315 | for (ix = NUM_ARP_ENTRY; ix -- > 0; ) {
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| 316 | if (arp_cache[ix].expire && arp_cache[ix].ip_addr == addr)
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| 317 | return &arp_cache[ix];
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| 318 | }
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| 319 |
|
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| 320 | /* create ãçãªããæ°ããªã¨ã³ããªãç»é²ããã*/
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| 321 | if (create) {
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| 322 |
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| 323 | /* ã¾ãã空ããããã°ããã®ç©ºããå©ç¨ããã*/
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| 324 | for (ix = NUM_ARP_ENTRY; ix -- > 0; ) {
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| 325 | if (arp_cache[ix].expire == 0) {
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| 326 | arp_cache[ix].ip_addr = addr;
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| 327 | return &arp_cache[ix];
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| 328 | }
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| 329 | }
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| 330 |
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| 331 | /*
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| 332 | * 空ãããªããã°ãã¿ã¤ã ã¢ã¦ãã¾ã§æéãæçã®
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| 333 | * ã¨ã³ããªã¼ãç ´æ£ãã¦å©ç¨ããã
|
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| 334 | */
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| 335 | syslog(LOG_NOTICE, "[ARP] cache busy, size=%d", NUM_ARP_ENTRY);
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| 336 | min = 0xffff;
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| 337 | for (six = ix = NUM_ARP_ENTRY; ix -- > 0; )
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| 338 | if (arp_cache[ix].expire < min) {
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| 339 | six = ix;
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| 340 | min = arp_cache[ix].expire;
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| 341 | }
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| 342 | arp_cache[six].expire = 0;
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| 343 | arp_cache[six].ip_addr = addr;
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| 344 | return &arp_cache[six];
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| 345 | }
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| 346 | else
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| 347 | return NULL;
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| 348 | }
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| 349 |
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| 350 | /*
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| 351 | * arp_request -- MAC ã¢ãã¬ã¹è§£æ±ºè¦æ±
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| 352 | */
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| 353 |
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| 354 | ER
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| 355 | arp_request (T_IF_ADDR *ifaddr, T_IN4_ADDR dst)
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| 356 | {
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| 357 | ER error;
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| 358 | T_IN4_ADDR src;
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| 359 | T_ETHER_HDR *eth;
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| 360 | T_ARP_HDR *arph;
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| 361 | T_ETHER_ARP_HDR *et_arph;
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| 362 | T_NET_BUF *arp_req;
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| 363 |
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| 364 | NET_COUNT_ARP(net_count_arp.out_octets , IF_ARP_ETHER_HDR_SIZE - IF_HDR_SIZE);
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| 365 | NET_COUNT_ARP(net_count_arp.out_packets, 1);
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| 366 |
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| 367 | if ((error = tget_net_buf(&arp_req, IF_ARP_ETHER_HDR_SIZE, TMO_ARP_GET_NET_BUF)) == E_OK) {
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| 368 |
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| 369 | /* ã¤ã¼ãµãããããããè¨å®ããã*/
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| 370 | eth = GET_ETHER_HDR(arp_req);
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| 371 | memcpy(eth->dhost, ether_broad_cast_addr, ETHER_ADDR_LEN);
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| 372 | memcpy(eth->shost, ifaddr->lladdr, ETHER_ADDR_LEN);
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| 373 | eth->type = htons(ETHER_TYPE_ARP);
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| 374 |
|
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| 375 | /* ARP ããããè¨å®ããã*/
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| 376 | arph = GET_ARP_HDR(arp_req);
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| 377 | arph->hrd_addr = htons(ARPHRD_ETHER);
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| 378 | arph->proto = htons(ETHER_TYPE_IP);
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| 379 | arph->hdr_len = sizeof(et_arph->shost);
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| 380 | arph->proto_len = sizeof(et_arph->sproto);
|
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| 381 | arph->opcode = htons(ARPOP_REQUEST);
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| 382 |
|
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| 383 | /* ã¤ã¼ãµããã ARP ããããè¨å®ããã*/
|
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| 384 | et_arph = GET_ETHER_ARP_HDR(arp_req);
|
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| 385 | src = IF_GET_IFNET()->in4_ifaddr.addr;
|
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| 386 | memcpy(et_arph->shost, ifaddr->lladdr, ETHER_ADDR_LEN);
|
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| 387 | memset(et_arph->thost, 0, ETHER_ADDR_LEN);
|
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| 388 | ahtonl(et_arph->sproto, src);
|
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| 389 | ahtonl(et_arph->tproto, dst);
|
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| 390 |
|
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| 391 | /* éä¿¡ããã*/
|
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| 392 | error = IF_RAW_OUTPUT(arp_req, TMO_ARP_OUTPUT);
|
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| 393 | }
|
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| 394 | if (error != E_OK)
|
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| 395 | NET_COUNT_ARP(net_count_arp.out_err_packets, 1);
|
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| 396 | return error;
|
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| 397 | }
|
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| 398 |
|
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| 399 | /*
|
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| 400 | * arp_get_cache -- ARP ãã£ãã·ã¥ãç²å¾ããã
|
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| 401 | */
|
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| 402 |
|
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| 403 | const T_ARP_ENTRY *
|
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| 404 | arp_get_cache (void)
|
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| 405 | {
|
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| 406 | return arp_cache;
|
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| 407 | }
|
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| 408 |
|
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| 409 | /*
|
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| 410 | * arp_input -- ARP ã®å
|
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| 411 | ¥åé¢æ°
|
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| 412 | */
|
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| 413 |
|
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| 414 | void
|
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| 415 | arp_input (T_IF_ADDR *ifaddr, T_NET_BUF *input)
|
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| 416 | {
|
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| 417 | T_ARP_HDR *arph;
|
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| 418 |
|
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| 419 | NET_COUNT_ARP(net_count_arp.in_octets , input->len - IF_HDR_SIZE);
|
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| 420 | NET_COUNT_ARP(net_count_arp.in_packets, 1);
|
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| 421 |
|
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| 422 | /* ARP ãããã®é·ãããã§ãã¯ããã*/
|
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| 423 | if (input->len < IF_ARP_HDR_SIZE)
|
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| 424 | goto buf_rel;
|
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| 425 |
|
---|
| 426 | arph = GET_ARP_HDR(input);
|
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| 427 |
|
---|
| 428 | /*
|
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| 429 | * ç©çã¢ãã¬ã¹ãã©ã¼ãããã Ehternet 以å¤
|
---|
| 430 | * ã¾ãã¯ããããã³ã«ã IP 以å¤ã¯ã¨ã©ã¼ã
|
---|
| 431 | */
|
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| 432 | if (ntohs(arph->hrd_addr) != ARPHRD_ETHER ||
|
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| 433 | ntohs(arph->proto) != ETHER_TYPE_IP)
|
---|
| 434 | goto buf_rel;
|
---|
| 435 |
|
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| 436 | /* ARP ããã + Ether ARP ãããã®é·ãããã§ãã¯ããã*/
|
---|
| 437 | if (input->len < IF_ARP_ETHER_HDR_SIZE)
|
---|
| 438 | goto buf_rel;
|
---|
| 439 |
|
---|
| 440 | in_arpinput(ifaddr, input);
|
---|
| 441 | return;
|
---|
| 442 |
|
---|
| 443 | buf_rel:
|
---|
| 444 | NET_COUNT_ARP(net_count_arp.in_err_packets, 1);
|
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| 445 | syscall(rel_net_buf(input));
|
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| 446 | }
|
---|
| 447 |
|
---|
| 448 | /*
|
---|
| 449 | * arp_resolve -- MAC ã¢ãã¬ã¹è§£æ±º
|
---|
| 450 | *
|
---|
| 451 | * ã¢ãã¬ã¹è§£æ±ºãã§ããã°ãæ»ãå¤ã¯ true ãè¿ããã§ããªããã°
|
---|
| 452 | * éä¿¡ããã³ãã£ã³ã°ãã¦ãæ»ãå¤ã¯ false ãè¿ãã
|
---|
| 453 | */
|
---|
| 454 |
|
---|
| 455 | bool_t
|
---|
| 456 | arp_resolve (T_IF_ADDR *ifaddr, T_NET_BUF *output, T_IN4_ADDR gw)
|
---|
| 457 | {
|
---|
| 458 | T_ARP_ENTRY *ent;
|
---|
| 459 | T_ETHER_HDR *eth;
|
---|
| 460 | T_IFNET *ifp = IF_GET_IFNET();
|
---|
| 461 |
|
---|
| 462 | eth = GET_ETHER_HDR(output);
|
---|
| 463 |
|
---|
| 464 | /*
|
---|
| 465 | * 次ã®å ´åã¯ãã¤ã¼ãµãããã®ããã¼ããã£ã¹ãã¢ãã¬ã¹ãè¿ãã
|
---|
| 466 | *
|
---|
| 467 | * ã»å
|
---|
| 468 | ¨ãããã 1
|
---|
| 469 | * ã»ãã¹ãé¨ã®å
|
---|
| 470 | ¨ãããã 1 ã§ããããã¯ã¼ã¯é¨ããã¼ã«ã«ã¢ãã¬ã¹
|
---|
| 471 | */
|
---|
| 472 | if (gw == IPV4_ADDR_BROADCAST ||
|
---|
| 473 | gw == ((ifp->in4_ifaddr.addr & ifp->in4_ifaddr.mask) | ~ifp->in4_ifaddr.mask)) {
|
---|
| 474 | memcpy(eth->dhost, ether_broad_cast_addr, ETHER_ADDR_LEN);
|
---|
| 475 | return true;
|
---|
| 476 | }
|
---|
| 477 |
|
---|
| 478 | /* éä¿¡å
|
---|
| 479 | GW ã® IP ã¢ãã¬ã¹ã ARP ãã£ãã·ã¥ã«ããã調ã¹ãã*/
|
---|
| 480 | syscall(wai_sem(SEM_ARP_CACHE_LOCK));
|
---|
| 481 | ent = arp_lookup(gw, true);
|
---|
| 482 | if (ent->expire) {
|
---|
| 483 | memcpy(eth->dhost, ent->mac_addr, ETHER_ADDR_LEN);
|
---|
| 484 | syscall(sig_sem(SEM_ARP_CACHE_LOCK));
|
---|
| 485 | return true;
|
---|
| 486 | }
|
---|
| 487 | else {
|
---|
| 488 | /* éä¿¡ããã³ãã³ã°ããã¦ãããã¬ã¼ã ãããã°æ¨ã¦ãã*/
|
---|
| 489 | if (ent->hold) {
|
---|
| 490 | NET_COUNT_IP4(net_count_ip4[NC_IP4_OUT_ERR_PACKETS], 1);
|
---|
| 491 | syscall(rel_net_buf(ent->hold));
|
---|
| 492 | }
|
---|
| 493 |
|
---|
| 494 | /*
|
---|
| 495 | * éä¿¡ããã³ãã£ã³ã°ããã
|
---|
| 496 | * IF ã§ãããã¯ã¼ã¯ãããã¡ãéæ¾ããªããã©ã°ãè¨å®ããã¦ããã¨ãã¯ã
|
---|
| 497 | * éä¿¡ããã³ãã£ã³ã°ããªãã
|
---|
| 498 | */
|
---|
| 499 | if ((output->flags & NB_FLG_NOREL_IFOUT) == 0)
|
---|
| 500 | ent->hold = output;
|
---|
| 501 | else {
|
---|
| 502 | output->flags &= (uint8_t)~NB_FLG_NOREL_IFOUT;
|
---|
| 503 | ent->hold = NULL;
|
---|
| 504 | }
|
---|
| 505 | syscall(sig_sem(SEM_ARP_CACHE_LOCK));
|
---|
| 506 |
|
---|
| 507 | /* ã¢ãã¬ã¹è§£æ±ºè¦æ±ãéä¿¡ããã*/
|
---|
| 508 | arp_request(ifaddr, gw);
|
---|
| 509 | return false;
|
---|
| 510 | }
|
---|
| 511 | }
|
---|
| 512 |
|
---|
| 513 | /*
|
---|
| 514 | * arp_init -- ARP åæå
|
---|
| 515 | */
|
---|
| 516 |
|
---|
| 517 | void
|
---|
| 518 | arp_init (void)
|
---|
| 519 | {
|
---|
| 520 | timeout(arp_timer, NULL, ARP_TIMER_TMO);
|
---|
| 521 | }
|
---|
| 522 |
|
---|
| 523 | #ifdef ETHER_CFG_MULTICAST
|
---|
| 524 | /*
|
---|
| 525 | * ether_map_ipv4_multicast -- IPv4 ãã«ããã£ã¹ãã¢ãã¬ã¹ããã¤ã¼ãµãããã»ãã«ããã£ã¹ãã¢ãã¬ã¹ã¸ã®å¤æ
|
---|
| 526 | */
|
---|
| 527 |
|
---|
| 528 | void
|
---|
| 529 | ether_map_ipv4_multicast (T_ETHER_ADDR *eaddr, T_IN4_ADDR maddr)
|
---|
| 530 | {
|
---|
| 531 | eaddr->lladdr[0] = UINT_C(0x01);
|
---|
| 532 | eaddr->lladdr[1] = UINT_C(0x00);
|
---|
| 533 | eaddr->lladdr[2] = UINT_C(0x5E);
|
---|
| 534 | eaddr->lladdr[3] = (uint8_t)((maddr & 0x7F0000) >> 16);
|
---|
| 535 | eaddr->lladdr[4] = (uint8_t)((maddr & 0xFF00) >> 8);
|
---|
| 536 | eaddr->lladdr[5] = (uint8_t)(maddr & 0xFF);
|
---|
| 537 | }
|
---|
| 538 | #endif /* ETHER_CFG_MULTICAST */
|
---|
| 539 |
|
---|
| 540 | #endif /* of #if defined(_IP4_CFG) && defined(SUPPORT_ETHER) */
|
---|