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: tcp_timer.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 | /*
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47 | * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
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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 | * @(#)tcp_timer.c 8.2 (Berkeley) 5/24/95
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79 | * $FreeBSD: src/sys/netinet/tcp_timer.c,v 1.28.2.1 1999/08/29 16:29:56 peter Exp $
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80 | */
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81 |
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82 | #ifdef TARGET_KERNEL_ASP
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83 |
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84 | #include <kernel.h>
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85 | #include <sil.h>
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86 | #include "kernel_cfg.h"
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87 |
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88 | #endif /* of #ifdef TARGET_KERNEL_ASP */
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89 |
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90 | #ifdef TARGET_KERNEL_JSP
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91 |
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92 | #include <s_services.h>
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93 | #include <t_services.h>
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94 | #include "kernel_id.h"
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95 |
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96 | #endif /* of #ifdef TARGET_KERNEL_JSP */
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97 |
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98 | #include <tinet_defs.h>
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99 | #include <tinet_config.h>
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100 |
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101 | #include <net/if.h>
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102 | #include <net/if_ppp.h>
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103 | #include <net/if_loop.h>
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104 | #include <net/ethernet.h>
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105 | #include <net/net.h>
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106 | #include <net/net_var.h>
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107 | #include <net/net_buf.h>
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108 | #include <net/net_timer.h>
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109 |
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110 | #include <netinet/in.h>
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111 | #include <netinet/in_var.h>
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112 | #include <netinet6/in6.h>
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113 | #include <netinet6/in6_var.h>
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114 | #include <netinet/ip.h>
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115 | #include <netinet/ip6.h>
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116 | #include <netinet/tcp.h>
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117 | #include <netinet/tcp_timer.h>
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118 | #include <netinet/tcp_var.h>
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119 | #include <netinet/tcp_fsm.h>
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120 | #include <netinet/tcp_seq.h>
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121 |
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122 | #ifdef SUPPORT_TCP
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123 |
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124 | /*
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125 | * å±æé¢æ°
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126 | */
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127 |
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128 | static T_TCP_CEP *tcp_timers (T_TCP_CEP *cep, int_t tix);
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129 |
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130 | #if defined(NUM_TCP_TW_CEP_ENTRY) && NUM_TCP_TW_CEP_ENTRY > 0
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131 |
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132 | static void tcp_tw_timo (void);
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133 |
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134 | #endif /* of #if defined(NUM_TCP_TW_CEP_ENTRY) && NUM_TCP_TW_CEP_ENTRY > 0 */
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135 |
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136 | /*
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137 | * ããã¯ãªãæé
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138 | *
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139 | * åéãè¡ããã³ã«ãã¿ã¤ã ã¢ã¦ãã®æéã延é·ããã
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140 | */
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141 |
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142 | const static uint8_t tcp_back_off[] = {
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143 | UINT_C(1), UINT_C(2), UINT_C(4), UINT_C(8),
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144 | UINT_C(16), UINT_C(32), UINT_C(64), UINT_C(64),
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145 | UINT_C(64), UINT_C(64), UINT_C(64), UINT_C(64),
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146 | UINT_C(64)
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147 | };
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148 |
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149 | #define TCP_TOTAL_BACK_OFF 511 /* ããã¯ãªãæéã®åè¨ */
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150 |
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151 | /*
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152 | * tcp_timers -- ã¿ã¤ã ã¢ã¦ãå¦ç
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153 | */
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154 |
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155 | static T_TCP_CEP *
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156 | tcp_timers (T_TCP_CEP *cep, int_t tix)
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157 | {
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158 | uint16_t win;
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159 |
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160 |
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161 | switch (tix) {
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162 |
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163 | /*
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164 | * åéã¿ã¤ã
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165 | */
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166 | case TCP_TIM_REXMT:
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167 |
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168 | /*
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169 | * æ大åéåæ° (TCP_MAX_REXMT_SHIFTãæ¨æº 12 å) ã«ãªã£ãã¨ãã¯ã
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170 | * ã³ãã¯ã·ã§ã³ãåæããã
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171 | */
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172 | if (++ cep->rxtshift > TCP_MAX_REXMT_SHIFT) {
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173 | cep->rxtshift = TCP_MAX_REXMT_SHIFT;
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174 | cep->net_error = EV_REXMTMO;
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175 | cep = tcp_drop(cep, E_CLS);
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176 | break;
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177 | }
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178 |
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179 | /*
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180 | * åéã¿ã¤ã ã¢ã¦ããè¨ç®ããã
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181 | */
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182 | cep->rxtcur = tcp_range_set((T_TCP_TIME)(tcp_rexmt_val(cep) * tcp_back_off[cep->rxtshift]),
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183 | (T_TCP_TIME)TCP_TVAL_MIN,
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184 | (T_TCP_TIME)TCP_TVAL_MAX_REXMT);
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185 | cep->timer[TCP_TIM_REXMT] = cep->rxtcur;
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186 |
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187 | /*
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188 | * srtt: å¹³æ»åããã RTT
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189 | * rttvar: å¹³æ»åãããåæ£
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190 | *
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191 | * åéåæ°ãæ大åéåæ°ã® 1/4 ã«ãªã£ãã¨ãã¯ã
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192 | * å¹³æ»åãããåæ£ (rttvar) ã« srtt ãå ç®ãã
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193 | * å¹³æ»åããã RTT ã 0 ã«ããã
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194 | *
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195 | */
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196 | if (cep->rxtshift > TCP_MAX_REXMT_SHIFT / 4) {
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197 | cep->rttvar += (cep->srtt >> TCP_SRTT_SHIFT);
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198 | cep->srtt = 0;
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199 | }
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200 |
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201 | /*
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202 | * snd_nxt: 次ã«éä¿¡ãã SEQããã®æç¹ã§ã¯ãååéä¿¡ãã SEQ
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203 | * snd_una: æªç¢ºèªã®æå°éä¿¡ SEQ ã¾ãã¯ã確èªãããæ大éä¿¡ SEQ
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204 | *
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205 | * ååéä¿¡ãã SEQ (snd_nxt) ã
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206 | * 確èªãããæ大éä¿¡ SEQ (snd_una) ã¾ã§æ»ãã
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207 | */
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208 | cep->snd_nxt = cep->snd_una;
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209 | cep->flags |= TCP_CEP_FLG_ACK_NOW;
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210 |
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211 | /*
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212 | * rtt: å¾å¾©æéã®è¨æ¸¬ãä¸æ¢ããã
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213 | */
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214 | cep->rtt = 0;
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215 |
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216 | /*
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217 | * éä¿¡ã¦ã¤ã³ãã®è¨å®
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218 | *
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219 | * snd_wnd: ç¸æã®åä¿¡å¯è½ã¦ã£ã³ããµã¤ãº
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220 | * snd_cwnd: 輻輳ã¦ã£ã³ããµã¤ãº
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221 | * maxseg : ç¸æã®æ大åä¿¡ã»ã°ã¡ã³ããµã¤ãº
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222 | *
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223 | * ç¸æã®åä¿¡å¯è½ã¦ã£ã³ããµã¤ãº (snd_wnd) ãã
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224 | * 輻輳ã¦ã£ã³ããµã¤ãº (snd_cwnd) ã®
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225 | * ã©ã¡ããå°ãããµã¤ãºã® 1/2 ããæ´ã«
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226 | * ç¸æã®æ大åä¿¡ã»ã°ã¡ã³ããµã¤ãº (maxseg) ã§å²ã£ãå¤ã
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227 | * ãã ãã2 以ä¸
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228 | */
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229 | if (cep->snd_wnd < cep->snd_cwnd)
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230 | win = cep->snd_wnd / 2 / cep->maxseg;
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231 | else
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232 | win = cep->snd_cwnd / 2 / cep->maxseg;
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233 |
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234 | if (win < 2)
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235 | win = 2;
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236 |
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237 | /*
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238 | * 輻輳ã¦ã£ã³ããµã¤ãº (snd_cwnd) ã¯
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239 | * ç¸æã®åä¿¡å¯è½ã¦ã£ã³ããµã¤ãº (snd_wnd) ã«ã
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240 | * 輻輳ã¦ã£ã³ããµã¤ãºã®ãããå¤ (snd_ssthresh) ã¯
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241 | * ç¸æã®åä¿¡å¯è½ã¦ã£ã³ããµã¤ãº (snd_wnd) ã® win åã«
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242 | * è¨å®ããã
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243 | */
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244 | cep->snd_cwnd = cep->maxseg;
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245 | cep->snd_ssthresh = win * cep->maxseg;
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246 | cep->dupacks = 0;
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247 |
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248 | /* åºåããã¹ãããã*/
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249 | cep->flags |= TCP_CEP_FLG_POST_OUTPUT;
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250 | sig_sem(SEM_TCP_POST_OUTPUT);
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251 | break;
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252 |
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253 | /*
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254 | * æç¶ã¿ã¤ã
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255 | */
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256 | case TCP_TIM_PERSIST:
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257 |
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258 | /*
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259 | * æ大åéåæ° (TCP_MAX_REXMT_SHIFTãæ¨æº 12 å) ãè¶
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260 | ãã¦ãã¦ã
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261 | * ã¢ã¤ãã«æéããä¿çã¿ã¤ãã®æ¨æºå¤ (TCP_TVAL_KEEP_IDLEã
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262 | * æ¨æº 2 * 60 * 60 ç§) 以ä¸ãã
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263 | * åéã¿ã¤ã ã¢ã¦ãå¤ * ããã¯ãªãæéã®åè¨ä»¥ä¸ãªã
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264 | * ã³ãã¯ã·ã§ã³ãåæããã
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265 | */
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266 | if (cep->rxtshift > TCP_MAX_REXMT_SHIFT &&
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267 | (cep->idle >= TCP_TVAL_KEEP_IDLE ||
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268 | cep->idle >= tcp_rexmt_val(cep) * TCP_TOTAL_BACK_OFF)) {
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269 | cep->net_error = EV_REXMTMO;
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270 | cep = tcp_drop(cep, E_CLS);
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271 | break;
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272 | }
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273 |
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274 | /* æç¶ã¿ã¤ããåè¨å®ããåºåããã¹ãããã*/
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275 | tcp_set_persist_timer(cep);
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276 |
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277 | cep->flags |= TCP_CEP_FLG_FORCE | TCP_CEP_FLG_FORCE_CLEAR | TCP_CEP_FLG_POST_OUTPUT;
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278 | sig_sem(SEM_TCP_POST_OUTPUT);
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279 | break;
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280 |
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281 | /*
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282 | * ä¿ç (keep alive) ã¿ã¤ã
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283 | */
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284 | case TCP_TIM_KEEP:
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285 |
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286 | /*
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287 | * ã³ãã¯ã·ã§ã³ãéè¨ãããã¾ã§ã«ã¿ã¤ã ã¢ã¦ãããã
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288 | * ã³ãã¯ã·ã§ã³ã®éè¨ãä¸æ¢ããã
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289 | */
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290 | if (cep->fsm_state < TCP_FSM_ESTABLISHED) {
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291 | cep->net_error = EV_REXMTMO;
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292 | cep = tcp_drop(cep, E_CLS);
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293 | break;
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294 | }
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295 |
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296 | #ifdef TCP_CFG_ALWAYS_KEEP
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297 |
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298 | else if (cep->fsm_state < TCP_FSM_CLOSING) {
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299 | if (cep->idle >= TCP_TVAL_KEEP_IDLE +
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300 | TCP_TVAL_KEEP_COUNT * TCP_TVAL_KEEP_INTERVAL) {
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301 | cep->net_error = EV_REXMTMO;
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302 | cep = tcp_drop(cep, E_CLS);
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303 | break;
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304 | }
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305 | else
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306 | tcp_respond(NULL, cep, cep->rcv_nxt, cep->snd_una - 1,
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307 | cep->rbufsz - cep->rwbuf_count, 0);
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308 | cep->timer[TCP_TIM_KEEP] = TCP_TVAL_KEEP_INTERVAL;
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309 | }
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310 | else
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311 | cep->timer[TCP_TIM_KEEP] = TCP_TVAL_KEEP_IDLE;
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312 |
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313 | #else /* of #ifdef TCP_CFG_ALWAYS_KEEP */
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314 |
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315 | cep->timer[TCP_TIM_KEEP] = TCP_TVAL_KEEP_IDLE;
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316 |
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317 | #endif /* of #ifdef TCP_CFG_ALWAYS_KEEP */
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318 |
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319 | break;
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320 |
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321 | /*
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322 | * 2MSL ã¿ã¤ã
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323 | */
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324 | case TCP_TIM_2MSL:
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325 |
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326 | if (cep->fsm_state != TCP_FSM_TIME_WAIT &&
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327 | cep->idle <= TCP_TVAL_KEEP_COUNT * TCP_TVAL_KEEP_INTERVAL)
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328 | cep->timer[TCP_TIM_2MSL] = TCP_TVAL_KEEP_INTERVAL;
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329 | else
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330 | cep = tcp_close(cep);
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331 | break;
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332 | }
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333 |
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334 | return cep;
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335 | }
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336 |
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337 | /*
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338 | * tcp_cancel_timers -- å
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339 | ¨ã¦ã®ã¿ã¤ãããã£ã³ã»ã«ããã
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340 | */
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341 |
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342 | void
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343 | tcp_cancel_timers (T_TCP_CEP *cep)
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344 | {
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345 | int_t ix;
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346 |
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347 | for (ix = NUM_TCP_TIMERS; ix -- > 0; )
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348 | cep->timer[ix] = 0;
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349 | }
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350 |
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351 | #if defined(NUM_TCP_TW_CEP_ENTRY) && NUM_TCP_TW_CEP_ENTRY > 0
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352 |
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353 | /*
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354 | * tcp_tw_timo -- Time Wait ç¨ TCP é信端ç¹ã®ã¿ã¤ã ã¢ã¦ãå¦ç
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355 | */
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356 |
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357 | void
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358 | tcp_tw_timo (void)
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359 | {
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360 | T_TCP_CEP *cep, *lcep;
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361 | T_TCP_TWCEP* twcep;
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362 | T_TCP_TIME longer;
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363 | int_t frees, waits;
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364 |
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365 | /*
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366 | * Time Wait ç¨ TCP é信端ç¹ã§ã¿ã¤ã ã¢ã¦ãã®ã¨ã³ããªãæ¢ç´¢ãã
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367 | * æ¢ç´¢ããã¨ã³ããªã空ãã«ããã
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368 | */
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369 | frees = 0;
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370 | for (twcep = &tcp_twcep[NUM_TCP_TW_CEP_ENTRY]; twcep -- != tcp_twcep; )
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371 | if (twcep->fsm_state == TCP_FSM_TIME_WAIT && -- twcep->timer_2msl == 0) {
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372 | twcep->fsm_state = TCP_FSM_CLOSED;
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373 | frees ++;
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374 | }
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375 |
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376 | /*
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377 | * Time Wait ç¨ TCP é信端ç¹ã®ç©ºãã¨ã³ããªãçºçããã
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378 | * æ¨æº TCP é信端ç¹ã§ Time Wait ä¸ã® TCP é信端ç¹ãæ¢ç´¢ãã
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379 | * å¿
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380 | è¦ãªæ
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381 | å ±ã Time Wait ç¨ TCP é信端ç¹ã«ç§»ãã¦ã
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382 | * æ¨æºã® TCP é信端ç¹ãéæ¾ããã
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383 | */
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384 | if (frees > 0) {
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385 | waits = 0;
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386 | for (cep = &tcp_cep[tmax_tcp_cepid]; cep -- != tcp_cep; )
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387 | if (cep->fsm_state == TCP_FSM_TIME_WAIT)
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388 | waits ++;
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389 | if (waits > frees)
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390 | waits = frees;
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391 |
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392 | /*
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393 | * ãã£ã¨ãé·ãé Time Wait ãã¦ãã TCP é信端ç¹ãéæ¾ããã
|
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394 | */
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395 | while (waits > 0) {
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396 | longer = TCP_TVAL_MSL * 2;
|
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397 | lcep = NULL;
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398 | for (cep = &tcp_cep[tmax_tcp_cepid]; cep -- != tcp_cep; )
|
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399 | if (cep->fsm_state == TCP_FSM_TIME_WAIT && cep->timer[TCP_TIM_2MSL] < longer) {
|
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400 | longer = cep->timer[TCP_TIM_2MSL];
|
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401 | lcep = cep;
|
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402 | }
|
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403 | if (lcep != NULL) {
|
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404 | tcp_move_twcep(lcep);
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405 | waits --;
|
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406 | }
|
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407 | else
|
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408 | break;
|
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409 | }
|
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410 | }
|
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411 | }
|
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412 |
|
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413 | #endif /* of #if defined(NUM_TCP_TW_CEP_ENTRY) && NUM_TCP_TW_CEP_ENTRY > 0 */
|
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414 |
|
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415 | /*
|
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416 | * tcp_slow_timo -- 500 [ms] æ¯ã«å¼åºããã TCP ã¿ã¤ã ã¢ã¦ãé¢æ°
|
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417 | */
|
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418 |
|
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419 | void
|
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420 | tcp_slow_timo (void *ignore)
|
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421 | {
|
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422 | T_TCP_CEP *cep;
|
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423 | int_t cix, tix;
|
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424 |
|
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425 | for (cix = tmax_tcp_cepid; cix -- > 0; ) {
|
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426 | cep = &tcp_cep[cix];
|
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427 | if (!(cep->fsm_state == TCP_FSM_CLOSED || cep->fsm_state == TCP_FSM_LISTEN)) {
|
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428 | for (tix = NUM_TCP_TIMERS; cep != NULL && tix -- > 0; ) {
|
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429 | if (cep->timer[tix] != 0 && -- cep->timer[tix] == 0) {
|
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430 | cep = tcp_timers(cep, tix);
|
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431 | }
|
---|
432 | }
|
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433 | if (cep != NULL) {
|
---|
434 | cep->idle ++;
|
---|
435 | if (cep->rtt) {
|
---|
436 | cep->rtt ++;
|
---|
437 | }
|
---|
438 | }
|
---|
439 | }
|
---|
440 | }
|
---|
441 |
|
---|
442 | #if defined(NUM_TCP_TW_CEP_ENTRY) && NUM_TCP_TW_CEP_ENTRY > 0
|
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443 |
|
---|
444 | tcp_tw_timo();
|
---|
445 |
|
---|
446 | #endif /* of #if defined(NUM_TCP_TW_CEP_ENTRY) && NUM_TCP_TW_CEP_ENTRY > 0 */
|
---|
447 |
|
---|
448 | if (tcp_iss != 0) {
|
---|
449 | tcp_iss += TCP_ISS_INCR() / TCP_SLOW_HZ;
|
---|
450 | }
|
---|
451 |
|
---|
452 | timeout(tcp_slow_timo, NULL, TCP_SLOW_TMO);
|
---|
453 | }
|
---|
454 |
|
---|
455 | #ifdef TCP_CFG_DELAY_ACK
|
---|
456 |
|
---|
457 | /*
|
---|
458 | * tcp_fast_timo -- 200 [ms] æ¯ã«å¼åºããã TCP ã¿ã¤ã ã¢ã¦ãé¢æ°
|
---|
459 | */
|
---|
460 |
|
---|
461 | void
|
---|
462 | tcp_fast_timo (void *ignore)
|
---|
463 | {
|
---|
464 | T_TCP_CEP *cep;
|
---|
465 | int_t cix;
|
---|
466 |
|
---|
467 | for (cix = tmax_tcp_cepid; cix -- > 0; ) {
|
---|
468 | cep = &tcp_cep[cix];
|
---|
469 | if (cep->flags & TCP_CEP_FLG_DEL_ACK) {
|
---|
470 | cep->flags &= ~TCP_CEP_FLG_DEL_ACK;
|
---|
471 | cep->flags |= TCP_CEP_FLG_ACK_NOW | TCP_CEP_FLG_POST_OUTPUT;
|
---|
472 | sig_sem(SEM_TCP_POST_OUTPUT);
|
---|
473 | }
|
---|
474 | }
|
---|
475 |
|
---|
476 | timeout(tcp_fast_timo, NULL, TCP_FAST_TMO);
|
---|
477 | }
|
---|
478 |
|
---|
479 | #endif/* of #ifdef TCP_CFG_DELAY_ACK */
|
---|
480 |
|
---|
481 | /*
|
---|
482 | * tcp_range_set -- æéãæå®ããç¯å²ã«è¨å®ããã
|
---|
483 | */
|
---|
484 |
|
---|
485 | T_TCP_TIME
|
---|
486 | tcp_range_set (T_TCP_TIME value, T_TCP_TIME tvmin, T_TCP_TIME tvmax)
|
---|
487 | {
|
---|
488 | if ((uint32_t)value < (uint32_t)tvmin)
|
---|
489 | return tvmin;
|
---|
490 | else if ((uint32_t)value > (uint32_t)tvmax)
|
---|
491 | return tvmax;
|
---|
492 | else
|
---|
493 | return value;
|
---|
494 | }
|
---|
495 |
|
---|
496 | /*
|
---|
497 | * tcp_set_persist_timer -- æç¶ã¿ã¤ãã®è¨å®
|
---|
498 | */
|
---|
499 |
|
---|
500 | void
|
---|
501 | tcp_set_persist_timer (T_TCP_CEP *cep)
|
---|
502 | {
|
---|
503 | T_TCP_TIME time;
|
---|
504 |
|
---|
505 | /*
|
---|
506 | * srtt: å¹³æ»åããã RTT
|
---|
507 | * rttvar: å¹³æ»åãããåæ£
|
---|
508 | */
|
---|
509 | time = ((cep->srtt >> 2) + cep->rttvar) >> 1;
|
---|
510 |
|
---|
511 | /*
|
---|
512 | * åéã¿ã¤ããè¨å®ããã¦ããã°å復ä¸è½ã¨ã©ã¼
|
---|
513 | */
|
---|
514 | if (cep->timer[TCP_TIM_REXMT])
|
---|
515 | /* %%% panic("tcp_output REXMT"); %%% */;
|
---|
516 |
|
---|
517 | /*
|
---|
518 | * æç¶ã¿ã¤ããè¨å®ããã
|
---|
519 | */
|
---|
520 | cep->timer[TCP_TIM_PERSIST] = tcp_range_set((T_TCP_TIME)(time * tcp_back_off[cep->rxtshift]),
|
---|
521 | (T_TCP_TIME)TCP_TVAL_MIN_PERSIST,
|
---|
522 | (T_TCP_TIME)TCP_TVAL_MAX_PERSIST);
|
---|
523 |
|
---|
524 | /*
|
---|
525 | * åéåæ°ãæ´æ°ããã
|
---|
526 | */
|
---|
527 | if (cep->rxtshift < TCP_MAX_REXMT_SHIFT)
|
---|
528 | cep->rxtshift ++;
|
---|
529 | }
|
---|
530 |
|
---|
531 | #endif /* of #ifdef SUPPORT_TCP */
|
---|