[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: tcp_output.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_output.c 8.4 (Berkeley) 5/24/95
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| 79 | * $FreeBSD: src/sys/netinet/tcp_output.c,v 1.32.2.2 1999/08/29 16:29:55 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 <t_syslog.h>
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| 87 | #include "kernel_cfg.h"
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| 88 |
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| 89 | #endif /* of #ifdef TARGET_KERNEL_ASP */
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| 90 |
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| 91 | #ifdef TARGET_KERNEL_JSP
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| 92 |
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| 93 | #include <s_services.h>
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| 94 | #include <t_services.h>
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| 95 | #include "kernel_id.h"
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| 96 |
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| 97 | #endif /* of #ifdef TARGET_KERNEL_JSP */
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| 98 |
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| 99 | #include <tinet_defs.h>
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| 100 | #include <tinet_config.h>
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| 101 |
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| 102 | #include <net/if.h>
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| 103 | #include <net/if_ppp.h>
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| 104 | #include <net/if_loop.h>
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| 105 | #include <net/ethernet.h>
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| 106 | #include <net/net.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 | #include <net/net_count.h>
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| 110 |
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| 111 | #include <netinet/in.h>
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| 112 | #include <netinet6/in6.h>
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| 113 | #include <netinet/in_var.h>
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| 114 | #include <netinet/in_itron.h>
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| 115 | #include <netinet/ip.h>
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| 116 | #include <netinet/ip_var.h>
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| 117 | #include <netinet6/in6_var.h>
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| 118 | #include <netinet/ip6.h>
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| 119 | #include <netinet6/ip6_var.h>
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| 120 | #include <netinet/tcp.h>
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| 121 | #include <netinet/tcp_timer.h>
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| 122 | #include <netinet/tcp_var.h>
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| 123 | #include <netinet/tcp_fsm.h>
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| 124 | #include <netinet/tcp_seq.h>
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| 125 |
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| 126 | #ifdef SUPPORT_TCP
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| 127 |
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| 128 | /*
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| 129 | * é¢æ°
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| 130 | */
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| 131 |
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| 132 | static ER send_segment (bool_t *sendalot, T_TCP_CEP *cep, uint_t doff, uint_t win, uint_t len, uint8_t flags);
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| 133 | static void tcp_output (T_TCP_CEP *cep);
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| 134 |
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| 135 | /*
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| 136 | * å¤æ°
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| 137 | */
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| 138 |
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| 139 | /* åºåæã®ãã©ã°ã FSM ç¶æ
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| 140 | ã«ããé¸æããããã®è¡¨ */
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| 141 |
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| 142 | const static uint8_t tcp_outflags[] = {
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| 143 | TCP_FLG_RST | TCP_FLG_ACK, /* 0, ã¯ãã¼ãº */
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| 144 | 0, /* 1, ååãªã¼ãã³ */
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| 145 | TCP_FLG_SYN, /* 2, è½åãªã¼ãã³ãSYN éä¿¡æ¸ã¿ */
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| 146 | TCP_FLG_SYN | TCP_FLG_ACK, /* 3, SYM ãåä¿¡ããSYN éä¿¡æ¸ã¿ */
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| 147 | TCP_FLG_ACK, /* 4, ã³ãã¯ã·ã§ã³éè¨å®äº */
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| 148 | TCP_FLG_ACK, /* 5, FIN åä¿¡ãã¯ãã¼ãºå¾
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| 149 | ã¡ */
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| 150 | TCP_FLG_FIN | TCP_FLG_ACK, /* 6, çµäºãã¦ãFIN éä¿¡æ¸ã¿ */
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| 151 | TCP_FLG_FIN | TCP_FLG_ACK, /* 7, çµäºãFIN 交ææ¸ã¿ãACK å¾
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| 152 | ã¡ */
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| 153 | TCP_FLG_FIN | TCP_FLG_ACK, /* 8, FIN åä¿¡ãçµäºãACK å¾
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| 154 | ã¡ */
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| 155 | TCP_FLG_ACK, /* 9, çµäºãFIN ä¼é確èªåä¿¡ãFINå¾
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| 156 | ã¡ */
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| 157 | TCP_FLG_ACK, /* 10, çµäºãæéå¾
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| 158 | ã¡ */
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| 159 | };
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| 160 |
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| 161 | /*
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| 162 | * send_segment -- TCP åºåå¦ç
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| 163 | */
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| 164 |
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| 165 | static ER
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| 166 | send_segment (bool_t *sendalot, T_TCP_CEP *cep, uint_t doff, uint_t win, uint_t len, uint8_t flags)
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| 167 | {
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| 168 | T_NET_BUF *output;
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| 169 | T_TCP_HDR *tcph;
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| 170 | uint_t optlen;
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| 171 | ER error;
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| 172 |
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| 173 | #ifdef TCP_CFG_OPT_MSS
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| 174 |
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| 175 | uint8_t *optp;
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| 176 |
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| 177 | if (flags & TCP_FLG_SYN)
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| 178 | optlen = TCP_OPT_LEN_MAXSEG;
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| 179 | else
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| 180 | optlen = 0;
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| 181 |
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| 182 | #else/* of #ifdef TCP_CFG_OPT_MSS */
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| 183 |
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| 184 | optlen = 0;
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| 185 |
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| 186 | #endif/* of #ifdef TCP_CFG_OPT_MSS */
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| 187 |
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| 188 | NET_COUNT_TCP(net_count_tcp[NC_TCP_SEND_SEGS], 1);
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| 189 | NET_COUNT_MIB(tcp_stats.tcpOutSegs, 1);
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| 190 |
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| 191 | /*
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| 192 | * ã»ã°ã¡ã³ãé·ããç¸æã®æ大åä¿¡ã»ã°ã¡ã³ãé·ã«èª¿æ´ããã
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| 193 | * ãããè¶
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| 194 | ãã¦ããå ´åã¯ãè¶
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| 195 | ããåãå¾ã§éä¿¡ããã
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| 196 | * ãã®ãããFIN ããããã¯ãªã¢ããã
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| 197 | *
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| 198 | * ãªãªã¸ãã«ã§ã¯ãt_maxopd ãå¶éé·ã«ãã¦ãããã
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| 199 | * æ¬å®è£
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| 200 | ã§ã¯ãç¸æã®æ大åä¿¡ã»ã°ã¡ã³ãã«ããã
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| 201 | */
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| 202 | if (len + optlen > cep->maxseg) {
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| 203 | flags &= ~TCP_FLG_FIN;
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| 204 | len = cep->maxseg - optlen;
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| 205 | *sendalot = true;
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| 206 | }
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| 207 |
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| 208 | /*
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| 209 | * éä¿¡ãããã¡ã空ã«ãªãã¨ã㯠PUSH ãã©ã°ãè¨å®ããã
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| 210 | */
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| 211 | if (len && doff + len >= cep->swbuf_count)
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| 212 | flags |= TCP_FLG_PUSH;
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| 213 |
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| 214 | #if defined(TCP_CFG_SWBUF_CSAVE_ONLY)
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| 215 |
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| 216 | if (len > 0 && ((cep->flags & TCP_CEP_FLG_WBCS_MASK) == TCP_CEP_FLG_WBCS_SEND_READY ||
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| 217 | (cep->flags & TCP_CEP_FLG_WBCS_MASK) == TCP_CEP_FLG_WBCS_SENT)) {
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| 218 |
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| 219 | /*
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| 220 | * éä¿¡ã¦ã¤ã³ããããã¡ãéæ¾ãããªãããã«ãã¦ã
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| 221 | * ãããã¯ã¼ã¯ãããã¡ãåºåã«ç§»ãã
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| 222 | */
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| 223 | cep->swbufq->flags |= NB_FLG_NOREL_IFOUT;
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| 224 | output = cep->swbufq;
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| 225 | }
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| 226 | else {
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| 227 |
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| 228 | /*
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| 229 | * ACK å®äºç¶æ
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| 230 | ã§ããã®é¢æ°ãå¼ã³åºããããã¨ãããã
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| 231 | * ãã®æã¯ãlen ã 0 ã«ãã¦ãå¦çãç¶ç¶ããã
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| 232 | */
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| 233 | len = 0;
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| 234 | if ((error = tcp_get_segment(&output, cep, optlen,
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| 235 | len, (uint_t)(net_buf_max_siz() - IF_IP_TCP_HDR_SIZE),
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| 236 | NBA_SEARCH_ASCENT, TMO_TCP_GET_NET_BUF)) != E_OK) {
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| 237 | if (cep->timer[TCP_TIM_REXMT] == 0)
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| 238 | cep->timer[TCP_TIM_REXMT] = cep->rxtcur;
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| 239 | goto err_ret;
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| 240 | }
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| 241 | }
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| 242 |
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| 243 | #elif defined(TCP_CFG_SWBUF_CSAVE) /* of #if defined(TCP_CFG_SWBUF_CSAVE_ONLY) */
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| 244 |
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| 245 | if (IS_PTR_DEFINED(cep->sbuf)) {
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| 246 | if ((error = tcp_get_segment(&output, cep, optlen,
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| 247 | len, (uint_t)(net_buf_max_siz() - IF_IP_TCP_HDR_SIZE),
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| 248 | NBA_SEARCH_ASCENT, TMO_TCP_GET_NET_BUF)) != E_OK) {
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| 249 | if (cep->timer[TCP_TIM_REXMT] == 0)
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| 250 | cep->timer[TCP_TIM_REXMT] = cep->rxtcur;
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| 251 | goto err_ret;
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| 252 | }
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| 253 | }
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| 254 | else if (len > 0 && ((cep->flags & TCP_CEP_FLG_WBCS_MASK) == TCP_CEP_FLG_WBCS_SEND_READY ||
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| 255 | (cep->flags & TCP_CEP_FLG_WBCS_MASK) == TCP_CEP_FLG_WBCS_SENT)) {
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| 256 |
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| 257 | /*
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| 258 | * éä¿¡ã¦ã¤ã³ããããã¡ãéæ¾ãããªãããã«ãã¦ã
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| 259 | * ãããã¯ã¼ã¯ãããã¡ãåºåã«ç§»ãã
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| 260 | */
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| 261 | cep->swbufq->flags |= NB_FLG_NOREL_IFOUT;
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| 262 | output = cep->swbufq;
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| 263 | }
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| 264 | else {
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| 265 |
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| 266 | /*
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| 267 | * ACK å®äºç¶æ
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| 268 | ã§ããã®é¢æ°ãå¼ã³åºããããã¨ãããã
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| 269 | * ãã®æã¯ãlen ã 0 ã«ãã¦ãå¦çãç¶ç¶ããã
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| 270 | */
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| 271 | len = 0;
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| 272 | if ((error = tcp_get_segment(&output, cep, optlen,
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| 273 | len, (uint_t)(net_buf_max_siz() - IF_IP_TCP_HDR_SIZE),
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| 274 | NBA_SEARCH_ASCENT, TMO_TCP_GET_NET_BUF)) != E_OK) {
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| 275 | if (cep->timer[TCP_TIM_REXMT] == 0)
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| 276 | cep->timer[TCP_TIM_REXMT] = cep->rxtcur;
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| 277 | goto err_ret;
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| 278 | }
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| 279 | }
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| 280 |
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| 281 | #else /* of #if defined(TCP_CFG_SWBUF_CSAVE_ONLY) */
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| 282 |
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| 283 | if ((error = tcp_get_segment(&output, cep, optlen,
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| 284 | len, (uint_t)(net_buf_max_siz() - IF_IP_TCP_HDR_SIZE),
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| 285 | NBA_SEARCH_ASCENT, TMO_TCP_GET_NET_BUF)) != E_OK) {
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| 286 | if (cep->timer[TCP_TIM_REXMT] == 0)
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| 287 | cep->timer[TCP_TIM_REXMT] = cep->rxtcur;
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| 288 | goto err_ret;
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| 289 | }
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| 290 |
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| 291 | #endif /* of #if defined(TCP_CFG_SWBUF_CSAVE_ONLY) */
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| 292 |
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| 293 | /*
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| 294 | * TCP ãªãã·ã§ã³ã®è¨å®ãè¡ãã
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| 295 | * æ¬å®è£
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| 296 | ã§ã¯ãæ大ã»ã°ã¡ã³ããµã¤ãºã®ã¿è¨å®ããã
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| 297 | */
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| 298 | if (flags & TCP_FLG_SYN) {
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| 299 | cep->snd_nxt = cep->iss;
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| 300 |
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| 301 | #ifdef TCP_CFG_OPT_MSS
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| 302 |
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| 303 | optp = GET_TCP_OPT(output, IF_IP_TCP_HDR_OFFSET);
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| 304 | *optp ++ = TCP_OPT_MAXSEG;
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| 305 | *optp ++ = TCP_OPT_LEN_MAXSEG;
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| 306 | *(uint16_t*)optp = htons(DEF_TCP_RCV_SEG);
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| 307 |
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| 308 | #endif/* of #ifdef TCP_CFG_OPT_MSS */
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| 309 |
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| 310 | }
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| 311 |
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| 312 | /* TCP SDU ã«éä¿¡ãã¼ã¿ãã³ãã¼ããã*/
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| 313 |
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| 314 | if (len > 0) {
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| 315 | if (SEQ_LT(cep->snd_nxt, cep->snd_max)) {
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| 316 | NET_COUNT_TCP(net_count_tcp[NC_TCP_SEND_REXMIT_SEGS], 1);
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| 317 | NET_COUNT_MIB(tcp_stats.tcpRetransSegs, 1);
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| 318 | }
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| 319 | TCP_READ_SWBUF(cep, output, len, doff);
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| 320 | }
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| 321 | else {
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| 322 | if (cep->flags & TCP_CEP_FLG_ACK_NOW)
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| 323 | NET_COUNT_TCP(net_count_tcp[NC_TCP_SEND_ACKS], 1);
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| 324 | if (flags & (TCP_FLG_FIN | TCP_FLG_SYN | TCP_FLG_RST))
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| 325 | NET_COUNT_TCP(net_count_tcp[NC_TCP_SEND_CNTL_SEGS], 1);
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| 326 |
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| 327 |
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| 328 | #ifdef TCP_CFG_EXTENTIONS
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| 329 |
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| 330 | if (SEQ_LT(cep->snd_up, cep->snd_una))
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| 331 | NET_COUNT_TCP(net_count_tcp[NC_TCP_SEND_URG_SEGS], 1);
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| 332 |
|
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| 333 | #endif /* of #ifdef TCP_CFG_EXTENTIONS */
|
---|
| 334 |
|
---|
| 335 | }
|
---|
| 336 |
|
---|
| 337 | /*
|
---|
| 338 | * snd_max: éä¿¡ããæ大 SEQ
|
---|
| 339 | * snd_nxt: 次ã«éä¿¡ãã SEQ
|
---|
| 340 | *
|
---|
| 341 | * ç¸æãã FIN ãåä¿¡ããã¾ã FIN ãéä¿¡ãã¦ããªããã
|
---|
| 342 | * éããã¼ã¿ããªãã¨ãã¯ãFIN ãç¸æã«å±ããããã
|
---|
| 343 | * ã»ã°ã¡ã³ããéä¿¡ããããSEQ ã¯é²ããªãã
|
---|
| 344 | */
|
---|
| 345 | if ((flags & TCP_FLG_FIN) && (cep->flags & TCP_CEP_FLG_SENT_FIN) &&
|
---|
| 346 | cep->snd_nxt == cep->snd_max) {
|
---|
| 347 | cep->snd_nxt --;
|
---|
| 348 | }
|
---|
| 349 |
|
---|
| 350 | tcph = GET_TCP_HDR(output, IF_IP_TCP_HDR_OFFSET);
|
---|
| 351 |
|
---|
| 352 | /*
|
---|
| 353 | * SEQãACKããã©ã°ã®è¨å®ã
|
---|
| 354 | */
|
---|
| 355 | if (len > 0 || (flags & (TCP_FLG_SYN | TCP_FLG_FIN)) || cep->timer[TCP_TIM_PERSIST] != 0)
|
---|
| 356 | tcph->seq = htonl(cep->snd_nxt);
|
---|
| 357 | else
|
---|
| 358 | tcph->seq = htonl(cep->snd_max);
|
---|
| 359 |
|
---|
| 360 | /*
|
---|
| 361 | * rcv_nxt: åä¿¡ãæå¾
|
---|
| 362 | ãã¦ããæå°ã® SEQ
|
---|
| 363 | */
|
---|
| 364 | tcph->ack = htonl(cep->rcv_nxt);
|
---|
| 365 | tcph->flags = flags;
|
---|
| 366 |
|
---|
| 367 | /*
|
---|
| 368 | * åä¿¡ã¦ã£ã³ãã®è¨ç®
|
---|
| 369 | *
|
---|
| 370 | * rbufsz: åä¿¡ç¨ãããã¡ãµã¤ãº
|
---|
| 371 | * maxseg: ç¸æã®æ大åä¿¡ã»ã°ã¡ã³ããµã¤ãº
|
---|
| 372 | */
|
---|
| 373 | if (win < (cep->rbufsz / 4) && win < cep->maxseg)
|
---|
| 374 | win = 0;
|
---|
| 375 |
|
---|
| 376 | /*
|
---|
| 377 | * rcv_nxt: åä¿¡ãæå¾
|
---|
| 378 | ãã¦ããæå°ã® SEQ
|
---|
| 379 | * rcv_adv: åä¿¡ãæå¾
|
---|
| 380 | ãã¦ããæ大㮠SEQ
|
---|
| 381 | */
|
---|
| 382 | if ((int32_t)win < (int32_t)(cep->rcv_adv - cep->rcv_nxt))
|
---|
| 383 | win = (uint_t)(cep->rcv_adv - cep->rcv_nxt);
|
---|
| 384 |
|
---|
| 385 | tcph->win = htons(win);
|
---|
| 386 |
|
---|
| 387 | #ifdef TCP_CFG_EXTENTIONS
|
---|
| 388 |
|
---|
| 389 | /*
|
---|
| 390 | * ç·æ¥ãã¤ã³ã¿ã®è¨å®
|
---|
| 391 | */
|
---|
| 392 | if (SEQ_GT(cep->snd_up, cep->snd_nxt)) {
|
---|
| 393 | if (TCP_CFG_URG_OFFSET)
|
---|
| 394 | tcph->urp = htons((uint16_t)(cep->snd_up - cep->snd_nxt));
|
---|
| 395 | else
|
---|
| 396 | tcph->urp = htons((uint16_t)(cep->snd_up - cep->snd_nxt - 1));
|
---|
| 397 | tcph->flags |= TCP_FLG_URG;
|
---|
| 398 | }
|
---|
| 399 | else
|
---|
| 400 | cep->snd_up = cep->snd_una;
|
---|
| 401 |
|
---|
| 402 | #endif /* of #ifdef TCP_CFG_EXTENTIONS */
|
---|
| 403 |
|
---|
| 404 | /*
|
---|
| 405 | * ãã§ãã¯ãµã ãè¨å®ããã
|
---|
| 406 | */
|
---|
| 407 | tcph->sum = 0;
|
---|
| 408 | tcph->sum = IN_CKSUM(output, IPPROTO_TCP, (uint_t)GET_TCP_HDR_OFFSET(output),
|
---|
| 409 | GET_TCP_HDR_SIZE2(output, IF_IP_TCP_HDR_OFFSET) + len);
|
---|
| 410 |
|
---|
| 411 | /* ãããã¯ã¼ã¯ãããã¡é·ã調æ´ããã*/
|
---|
| 412 | output->len = (uint16_t)(GET_IF_IP_TCP_HDR_SIZE2(output, IF_IP_TCP_HDR_OFFSET) + len);
|
---|
| 413 |
|
---|
| 414 | /*
|
---|
| 415 | * ã¿ã¤ãã®èª¿æ´
|
---|
| 416 | */
|
---|
| 417 | if ((cep->flags & TCP_CEP_FLG_FORCE) == 0 || cep->timer[TCP_TIM_PERSIST] == 0) {
|
---|
| 418 | T_TCP_SEQ startseq = cep->snd_nxt;
|
---|
| 419 |
|
---|
| 420 | /*
|
---|
| 421 | * 次ã«éä¿¡ãã SEQ (snd_nxt) ãä»åéä¿¡ãããã¼ã¿æ°åé²ããã
|
---|
| 422 | */
|
---|
| 423 | if (flags & TCP_FLG_SYN)
|
---|
| 424 | cep->snd_nxt ++;
|
---|
| 425 | if (flags & TCP_FLG_FIN) {
|
---|
| 426 | cep->flags |= TCP_CEP_FLG_SENT_FIN;
|
---|
| 427 | cep->snd_nxt ++;
|
---|
| 428 | }
|
---|
| 429 |
|
---|
| 430 | cep->snd_nxt += len;
|
---|
| 431 |
|
---|
| 432 | /*
|
---|
| 433 | * 次ã«éä¿¡ãã SEQ (snd_nxt) ã
|
---|
| 434 | * éä¿¡ããæ大 SEQ (snd_max) ããé²ãã§ããã°ã
|
---|
| 435 | * éä¿¡ããæ大 SEQ (snd_max) ãæ´æ°ããã
|
---|
| 436 | */
|
---|
| 437 | if (SEQ_GT(cep->snd_nxt, cep->snd_max)) {
|
---|
| 438 | cep->snd_max = cep->snd_nxt;
|
---|
| 439 | /*
|
---|
| 440 | * ãããå¾å¾©æéè¨æ¸¬ãè¡ã£ã¦ããªããã°ã
|
---|
| 441 | * ãã®éä¿¡ã«æéãåãããã
|
---|
| 442 | */
|
---|
| 443 | if (cep->rtt == 0) {
|
---|
| 444 | cep->rtt = 1;
|
---|
| 445 | cep->rtseq = startseq; /* æ´æ°åã® cep->snd_nxt */
|
---|
| 446 | }
|
---|
| 447 | }
|
---|
| 448 |
|
---|
| 449 | /*
|
---|
| 450 | * ããè¨å®ããã¦ããªãããACK ã¾ãã¯ä¿çãçºçãã¦ããªããã°ã
|
---|
| 451 | * åéã¿ã¤ããè¨å®ãããè¨å®ããåæå¤ã¯ã
|
---|
| 452 | * ãæ»ãããªå¾å¾©æé + 2 à å¾å¾©æéå¤åãã§ããã
|
---|
| 453 | * åéæéã®ããã¯ãªãã«ä½¿ãããã·ããã«ã¦ã³ããåæåããã
|
---|
| 454 | */
|
---|
| 455 | if (cep->timer[TCP_TIM_REXMT] == 0 && cep->snd_nxt != cep->snd_una) {
|
---|
| 456 | cep->timer[TCP_TIM_REXMT] = cep->rxtcur;
|
---|
| 457 | if (cep->timer[TCP_TIM_PERSIST] != 0) {
|
---|
| 458 | cep->timer[TCP_TIM_PERSIST] = 0;
|
---|
| 459 | cep->rxtshift = 0;
|
---|
| 460 | }
|
---|
| 461 | }
|
---|
| 462 | }
|
---|
| 463 |
|
---|
| 464 | /*
|
---|
| 465 | * 次ã«éä¿¡ãã SEQ (snd_nxt) + ä»åéä¿¡ãããã¼ã¿æ° (len) ã
|
---|
| 466 | * éä¿¡ããæ大 SEQ (snd_max) ããé²ãã§ããã°ã
|
---|
| 467 | * éä¿¡ããæ大 SEQ (snd_max) ãæ´æ°ããã
|
---|
| 468 | */
|
---|
| 469 | else if (SEQ_GT(cep->snd_nxt + len, cep->snd_max))
|
---|
| 470 | cep->snd_max = cep->snd_nxt + len;
|
---|
| 471 |
|
---|
| 472 | #ifdef TCP_CFG_SWBUF_CSAVE
|
---|
| 473 |
|
---|
| 474 | if ((cep->flags & TCP_CEP_FLG_WBCS_MASK) == TCP_CEP_FLG_WBCS_SEND_READY)
|
---|
| 475 | cep->flags = (cep->flags & ~TCP_CEP_FLG_WBCS_MASK) | TCP_CEP_FLG_WBCS_SENT;
|
---|
| 476 |
|
---|
| 477 | #endif /* of #ifdef TCP_CFG_SWBUF_CSAVE */
|
---|
| 478 |
|
---|
| 479 | #ifdef TCP_CFG_TRACE
|
---|
| 480 |
|
---|
| 481 | tcp_output_trace(output, cep);
|
---|
| 482 |
|
---|
| 483 | #endif /* of #ifdef TCP_CFG_TRACE */
|
---|
| 484 |
|
---|
| 485 | /* ãããã¯ã¼ã¯å±¤ (IP) ã®åºåé¢æ°ãå¼ã³åºãã*/
|
---|
| 486 | if ((error = IP_OUTPUT(output, TMO_TCP_OUTPUT)) != E_OK)
|
---|
| 487 | goto err_ret;
|
---|
| 488 |
|
---|
| 489 | /*
|
---|
| 490 | * ç¸æã«ä¼ããã¦ã£ã³ãã¦ãµã¤ãº (win) ã 0 以ä¸ã§ã
|
---|
| 491 | * åä¿¡ãæå¾
|
---|
| 492 | ãã¦ããæå°ã® SEQ (rcv_nxt) + win ã
|
---|
| 493 | * åä¿¡ãæå¾
|
---|
| 494 | ãã¦ããæ大㮠SEQ (rcv_adv) ããé²ãã§ããã°
|
---|
| 495 | * åä¿¡ãæå¾
|
---|
| 496 | ãã¦ããæ大㮠SEQ ãæ´æ°ããã
|
---|
| 497 | */
|
---|
| 498 | if (win > 0 && SEQ_GT(cep->rcv_nxt + win, cep->rcv_adv)) {
|
---|
| 499 | cep->rcv_adv = cep->rcv_nxt + win;
|
---|
| 500 | }
|
---|
| 501 |
|
---|
| 502 | /*
|
---|
| 503 | * æå¾ã«éä¿¡ãã ACK (last_ack_sent) ãæ´æ°ããã
|
---|
| 504 | */
|
---|
| 505 | cep->last_ack_sent = cep->rcv_nxt;
|
---|
| 506 |
|
---|
| 507 | /*
|
---|
| 508 | * ãã©ã°ã®è¨å®ãè¡ãã
|
---|
| 509 | */
|
---|
| 510 | cep->flags &= ~(TCP_CEP_FLG_ACK_NOW | TCP_CEP_FLG_DEL_ACK);
|
---|
| 511 | if (cep->flags & TCP_CEP_FLG_FORCE_CLEAR)
|
---|
| 512 | cep->flags &= ~(TCP_CEP_FLG_FORCE | TCP_CEP_FLG_FORCE_CLEAR);
|
---|
| 513 |
|
---|
| 514 | return E_OK;
|
---|
| 515 |
|
---|
| 516 | err_ret:
|
---|
| 517 | /*
|
---|
| 518 | * 以ä¸ã«é¢ä¿ããªããã©ã°ãã¯ãªã¢ã¼ããã
|
---|
| 519 | * ã»éåä¿¡ã¦ã£ã³ããããã¡ã®çã³ãã¼æ©è½
|
---|
| 520 | * ã»åçãªé信端ç¹ã®çæã»åé¤æ©è½
|
---|
| 521 | */
|
---|
| 522 | cep->flags &= (TCP_CEP_FLG_WBCS_NBUF_REQ | TCP_CEP_FLG_WBCS_MASK |
|
---|
| 523 | TCP_CEP_FLG_DYNAMIC | TCP_CEP_FLG_VALID);
|
---|
| 524 |
|
---|
| 525 | return error;
|
---|
| 526 | }
|
---|
| 527 |
|
---|
| 528 | /*
|
---|
| 529 | * tcp_output -- TCP åºåå¦ç
|
---|
| 530 | */
|
---|
| 531 |
|
---|
| 532 | void
|
---|
| 533 | tcp_output (T_TCP_CEP *cep)
|
---|
| 534 | {
|
---|
| 535 | bool_t sendalot = true, idle;
|
---|
| 536 | ER error = E_OK;
|
---|
| 537 | int32_t len;
|
---|
| 538 | uint_t doff, win;
|
---|
| 539 | uint8_t flags;
|
---|
| 540 |
|
---|
| 541 | /*
|
---|
| 542 | * snd_una: æªç¢ºèªã®æå°éä¿¡ SEQ ã¾ãã¯ã確èªãããæ大éä¿¡ SEQ
|
---|
| 543 | * snd_max: éä¿¡ããæ大 SEQ
|
---|
| 544 | */
|
---|
| 545 | idle = (cep->snd_max == cep->snd_una);
|
---|
| 546 |
|
---|
| 547 | /*
|
---|
| 548 | * idle: ã¢ã¤ãã«æé
|
---|
| 549 | * rxtcur: ç¾å¨ã®åéã¿ã¤ã ã¢ã¦ã
|
---|
| 550 | */
|
---|
| 551 | if (idle && cep->idle >= cep->rxtcur)
|
---|
| 552 |
|
---|
| 553 | /*
|
---|
| 554 | * snd_cwnd: 輻輳ã¦ã£ã³ããµã¤ãº
|
---|
| 555 | * maxseg : ç¸æã®æ大åä¿¡ã»ã°ã¡ã³ããµã¤ãº
|
---|
| 556 | *
|
---|
| 557 | * é·æéã¢ã¤ãã«ã ã£ãã®ã§ã¹ãã¼ã¹ã¿ã¼ãå¶å¾¡ã«è¨å®ããã
|
---|
| 558 | */
|
---|
| 559 | cep->snd_cwnd = cep->maxseg;
|
---|
| 560 |
|
---|
| 561 | while (error == E_OK && sendalot) {
|
---|
| 562 | sendalot = false;
|
---|
| 563 |
|
---|
| 564 | /*
|
---|
| 565 | * snd_nxt: 次ã«éä¿¡ãã SEQããã®æç¹ã§ã¯ãååéä¿¡ãã SEQ
|
---|
| 566 | * snd_una: æªç¢ºèªã®æå°éä¿¡ SEQãã¾ãã¯ç¢ºèªãããæ大éä¿¡ SEQ
|
---|
| 567 | *
|
---|
| 568 | * doff: éä¿¡ãéå§ãããªãã»ããã
|
---|
| 569 | * swbuf_count (éä¿¡ãããã¡ã«ãããªã¯ãããæ°)
|
---|
| 570 | * 0 V
|
---|
| 571 | * +-------------------------------------------+
|
---|
| 572 | * | sbuf |
|
---|
| 573 | * +-------------------------------------------+
|
---|
| 574 | * ^ ^
|
---|
| 575 | * |<------------->snd_nxt (ååéä¿¡ãã SEQ)
|
---|
| 576 | * | doff
|
---|
| 577 | * snd_una (ã¾ã 確èªããã¦ããªã)
|
---|
| 578 | */
|
---|
| 579 | doff = (uint_t)(cep->snd_nxt - cep->snd_una);
|
---|
| 580 |
|
---|
| 581 | /*
|
---|
| 582 | * snd_wnd: ç¸æã®åä¿¡å¯è½ã¦ã£ã³ããµã¤ãº
|
---|
| 583 | * snd_cwnd: 輻輳ã¦ã£ã³ããµã¤ãº
|
---|
| 584 | *
|
---|
| 585 | * win: ã©ã¡ããå°ããã¦ã£ã³ããµã¤ãºã«è¨å®ããã
|
---|
| 586 | */
|
---|
| 587 | win = cep->snd_wnd < cep->snd_cwnd ? cep->snd_wnd : cep->snd_cwnd;
|
---|
| 588 |
|
---|
| 589 | /* åºåãã©ã°ã®è¨å® */
|
---|
| 590 | flags = tcp_outflags[cep->fsm_state];
|
---|
| 591 | if (cep->flags & TCP_CEP_FLG_NEED_FIN)
|
---|
| 592 | flags |= TCP_FLG_FIN;
|
---|
| 593 | if (cep->flags & TCP_CEP_FLG_NEED_SYN)
|
---|
| 594 | flags |= TCP_FLG_SYN;
|
---|
| 595 | if (cep->flags & TCP_CEP_FLG_FORCE) {
|
---|
| 596 |
|
---|
| 597 | /*
|
---|
| 598 | * ãããéä¿¡ã¦ã¤ã³ããµã¤ãº (win) ã 0 ãªã 1 ãªã¯ãããéä¿¡ããã
|
---|
| 599 | * ããã§ãªããã°ãæç¶ã¿ã¤ã ã¢ã¦ãããã£ã³ã»ã«ãã
|
---|
| 600 | * åéä¿¡åæ° (rxtshift) ã 0 ã«ããã
|
---|
| 601 | */
|
---|
| 602 | if (win == 0) {
|
---|
| 603 |
|
---|
| 604 | /*
|
---|
| 605 | * doff: éä¿¡ãããªã¯ãããæ°ã
|
---|
| 606 | * swbuf_count: éä¿¡ãããã¡ã®ä½¿ç¨ä¸ãµã¤ãº
|
---|
| 607 | *
|
---|
| 608 | * éä¿¡ãããã¡ã«æ®ã£ã¦ãããªã¯ããããããããã
|
---|
| 609 | * éä¿¡ãããã¨ãã¦ãããªã¯ãããæ°ããå¤ããã°
|
---|
| 610 | * FIN ãã©ã°ãã¯ãªã¢ããã
|
---|
| 611 | */
|
---|
| 612 | if (doff < cep->swbuf_count)
|
---|
| 613 | flags &=~TCP_FLG_FIN;
|
---|
| 614 | win = 1;
|
---|
| 615 | }
|
---|
| 616 | else {
|
---|
| 617 | /*
|
---|
| 618 | * TCP_TIM_PERSIST: æç¶ã¿ã¤ã
|
---|
| 619 | * rxtshift: åéä¿¡åæ°ã® log(2)
|
---|
| 620 | */
|
---|
| 621 | cep->timer[TCP_TIM_PERSIST] = 0;
|
---|
| 622 | cep->rxtshift = 0;
|
---|
| 623 | }
|
---|
| 624 | }
|
---|
| 625 |
|
---|
| 626 | /*
|
---|
| 627 | * len: ä»åéä¿¡ãããªã¯ãããæ°
|
---|
| 628 | * swbuf_count (éä¿¡ãããã¡ã«ãããªã¯ãããæ°)
|
---|
| 629 | * |
|
---|
| 630 | * 0 V
|
---|
| 631 | * +-------------------------------------------+
|
---|
| 632 | * | sbuf | |
|
---|
| 633 | * +-------------------------------------------+
|
---|
| 634 | * ^ ^<------------->
|
---|
| 635 | * | | len
|
---|
| 636 | * |<------------->snd_nxt (ååéä¿¡ãã SEQ)
|
---|
| 637 | * | doff
|
---|
| 638 | * snd_una (ã¾ã 確èªããã¦ããªã)
|
---|
| 639 | */
|
---|
| 640 | if (cep->swbuf_count < win)
|
---|
| 641 | len = (int32_t)cep->swbuf_count - doff;
|
---|
| 642 | else
|
---|
| 643 | len = (int32_t)win - doff;
|
---|
| 644 |
|
---|
| 645 | /*
|
---|
| 646 | * ãã§ã«éä¿¡ããã¦ããã°ãSYN ãããããªãããã
|
---|
| 647 | * ãããã以ä¸ã®æ¡ä»¶ã§ã¯éä¿¡ãæ§ããã
|
---|
| 648 | *
|
---|
| 649 | * ã»ç¶æ
|
---|
| 650 | ã SYN éä¿¡ã
|
---|
| 651 | * ã»ã»ã°ã¡ã³ãããã¼ã¿ãå«ãã§ããã
|
---|
| 652 | */
|
---|
| 653 | if ((flags & TCP_FLG_SYN) && SEQ_GT(cep->snd_nxt, cep->snd_una)) {
|
---|
| 654 | flags &= ~TCP_FLG_SYN;
|
---|
| 655 | doff --; /* -1 㯠SYN ãã©ã°å */
|
---|
| 656 | len ++; /* +1 㯠SYN ãã©ã°å */
|
---|
| 657 | if (len > 0 && cep->fsm_state == TCP_FSM_SYN_SENT)
|
---|
| 658 | break;
|
---|
| 659 | }
|
---|
| 660 |
|
---|
| 661 | if (flags & TCP_FLG_SYN) {
|
---|
| 662 | len = 0;
|
---|
| 663 | flags &= ~TCP_FLG_FIN;
|
---|
| 664 | }
|
---|
| 665 |
|
---|
| 666 | if (len < 0) {
|
---|
| 667 |
|
---|
| 668 | /*
|
---|
| 669 | * len ã 0 以ä¸ãªãã0 ã«è¨å®ããã
|
---|
| 670 | * ãããéä¿¡ã¦ã£ã³ãã¦ãµã¤ãºã 0 ãªãã
|
---|
| 671 | * åéä¿¡ã¿ã¤ãããã£ã³ã»ã«ãã
|
---|
| 672 | * ååéä¿¡ãã SEQ (snd_nxt) ã
|
---|
| 673 | * 確èªãããæ大éä¿¡ SEQ (snd_una) ã«æ»ãã
|
---|
| 674 | * ããã¦ãæç¶ã¿ã¤ãã¼ãæ¢ã¾ã£ã¦ããã°ãåè¨å®ããã
|
---|
| 675 | */
|
---|
| 676 | len = 0;
|
---|
| 677 | if (win == 0) {
|
---|
| 678 | cep->timer[TCP_TIM_REXMT] = 0;
|
---|
| 679 | cep->rxtshift = 0;
|
---|
| 680 | cep->snd_nxt = cep->snd_una;
|
---|
| 681 | if (cep->timer[TCP_TIM_PERSIST] == 0)
|
---|
| 682 | tcp_set_persist_timer(cep);
|
---|
| 683 | }
|
---|
| 684 | }
|
---|
| 685 |
|
---|
| 686 |
|
---|
| 687 | /*
|
---|
| 688 | * ä»åéä¿¡ãããªã¯ãããæ° (len) ã¯ã
|
---|
| 689 | * ç¸æã®æ大åä¿¡ã»ã°ã¡ã³ããµã¤ãº (maxseg) ãè¶
|
---|
| 690 | ããªãããã«ããã
|
---|
| 691 | */
|
---|
| 692 | if (len > cep->maxseg) {
|
---|
| 693 | len = cep->maxseg;
|
---|
| 694 | sendalot = true;
|
---|
| 695 | }
|
---|
| 696 |
|
---|
| 697 | /*
|
---|
| 698 | * swbuf_count (éä¿¡ãããã¡ã«ãããªã¯ãããæ°)
|
---|
| 699 | * |
|
---|
| 700 | * 0 V
|
---|
| 701 | * +-------------------------------------------+
|
---|
| 702 | * | sbuf | |
|
---|
| 703 | * +-------------------------------------------+
|
---|
| 704 | * ^ ^<------------->
|
---|
| 705 | * | | len
|
---|
| 706 | * |<------------->snd_nxt (ååéä¿¡ãã SEQ)
|
---|
| 707 | * | doff
|
---|
| 708 | * snd_una (ã¾ã 確èªããã¦ããªã)
|
---|
| 709 | *
|
---|
| 710 | * ä»åéä¿¡å¾ããéä¿¡ãããã¡ã«ãã¼ã¿ãæ®ã£ã¦ããã°
|
---|
| 711 | * FIN ãã©ã°ãã¯ãªã¢ããã
|
---|
| 712 | */
|
---|
| 713 | if (SEQ_LT(cep->snd_nxt + len, cep->snd_una + cep->swbuf_count))
|
---|
| 714 | flags &= ~TCP_FLG_FIN;
|
---|
| 715 |
|
---|
| 716 | /*
|
---|
| 717 | * ãããã win ã¯ãåä¿¡ã¦ã£ã³ãã¦ãµã¤ãºã
|
---|
| 718 | * åä¿¡ãããã¡ã®ç©ºã容é
|
---|
| 719 | */
|
---|
| 720 | win = cep->rbufsz - cep->rwbuf_count;
|
---|
| 721 |
|
---|
| 722 | /*
|
---|
| 723 | * æããªã¦ã£ã³ãã¦ã»ã·ã³ããã¼ã ã®åé¿å¦ç (éä¿¡å´)
|
---|
| 724 | *
|
---|
| 725 | * 以ä¸ã®æ¡ä»¶ã§ãéä¿¡ãè¡ãã
|
---|
| 726 | *
|
---|
| 727 | * ã»ãã«ãµã¤ãº (maxseg) ã®ã»ã°ã¡ã³ããéããã¨ãã§ããã
|
---|
| 728 | * ã»ç¸æã®æ大ã®åä¿¡ã¦ã£ã³ãã¦ãµã¤ãºã® 1/2 ã®ãã¼ã¿ã
|
---|
| 729 | * éããã¨ãã§ããã
|
---|
| 730 | * ã»éä¿¡ãããã¡ã空ã«ã§ããã¢ã¤ãã«ãéé
|
---|
| 731 | 延ãªãã·ã§ã³ãæå¹ãªã¨ãã
|
---|
| 732 | */
|
---|
| 733 | if (len) {
|
---|
| 734 |
|
---|
| 735 | /*
|
---|
| 736 | * ä»åéä¿¡ãããªã¯ãããæ° (len) ã
|
---|
| 737 | * ç¸æã®æ大åä¿¡ã»ã°ã¡ã³ããµã¤ãº (maxseg) ã«
|
---|
| 738 | * ä¸è´ããã¨ãã¯éä¿¡ããã
|
---|
| 739 | */
|
---|
| 740 | if (len == cep->maxseg) {
|
---|
| 741 | error = send_segment(&sendalot, cep, doff, win, (uint_t)len, flags);
|
---|
| 742 | continue;
|
---|
| 743 | }
|
---|
| 744 |
|
---|
| 745 | /*
|
---|
| 746 | * ä»åã®éä¿¡ã§ãéä¿¡ãããã¡ã空ã«ã§ãã
|
---|
| 747 | * ã¢ã¤ãã«ãé PUSH ãªãã·ã§ã³ãæå¹ãªã¨ãã
|
---|
| 748 | */
|
---|
| 749 | if ((idle || (cep->flags & TCP_CEP_FLG_NO_DELAY)) &&
|
---|
| 750 | (cep->flags & TCP_CEP_FLG_NO_PUSH) == 0 &&
|
---|
| 751 | len + doff >= cep->swbuf_count) {
|
---|
| 752 | error = send_segment(&sendalot, cep, doff, win, (uint_t)len, flags);
|
---|
| 753 | continue;
|
---|
| 754 | }
|
---|
| 755 |
|
---|
| 756 | /*
|
---|
| 757 | * max_sndwnd: ä»ã¾ã§ã®æ大éä¿¡ã¦ã£ã³ããµã¤ãº
|
---|
| 758 | * snd_nxt: 次ã«éä¿¡ãã SEQ
|
---|
| 759 | * snd_max: éä¿¡ããæ大 SEQ
|
---|
| 760 | *
|
---|
| 761 | * 次ã®æ¡ä»¶ã§ã¯éä¿¡ãè¡ãã
|
---|
| 762 | *
|
---|
| 763 | * ã»å¼·å¶éä¿¡ãã©ã°ãã»ããããã¦ããã
|
---|
| 764 | * ã»ãã¼ã¿é·ãç¸æã®æ大ã®åä¿¡ã¦ã£ã³ãã¦ãµã¤ãºã® 1/2 以ä¸ã§ã
|
---|
| 765 | * ç¸æã®æ大ã®åä¿¡ã¦ã£ã³ãã¦ãµã¤ãºã 0 ãã大ããã
|
---|
| 766 | * ã»æ¬¡ã«éä¿¡ãã SEQ ãéä¿¡ããæ大 SEQ ããå°ããã
|
---|
| 767 | * ã¤ã¾ããåéããã¨ãã
|
---|
| 768 | */
|
---|
| 769 | if ((cep->flags & TCP_CEP_FLG_FORCE) ||
|
---|
| 770 | (len >= cep->max_sndwnd / 2 && cep->max_sndwnd > 0) ||
|
---|
| 771 | SEQ_LT(cep->snd_nxt, cep->snd_max)) {
|
---|
| 772 | error = send_segment(&sendalot, cep, doff, win, (uint_t)len, flags);
|
---|
| 773 | continue;
|
---|
| 774 | }
|
---|
| 775 | }
|
---|
| 776 |
|
---|
| 777 |
|
---|
| 778 | /*
|
---|
| 779 | * æããªã¦ã£ã³ãã¦ã»ã·ã³ããã¼ã ã®åé¿å¦ç (åä¿¡å´)
|
---|
| 780 | *
|
---|
| 781 | * ã¦ã£ã³ãã¦ãµã¤ãºããã«ãµã¤ãºã® 2 åã®ã»ã°ã¡ã³ãããããã¯
|
---|
| 782 | * åä¿¡ãããã¡å®¹éã® 1/2 ã®ãããããå°ããã»ãã®
|
---|
| 783 | * ãµã¤ãºã§å¢å ãããå ´åã¯ãã¦ã£ã³ãã¦ãµã¤ãºã®æ´æ°ãè¡ãã
|
---|
| 784 | */
|
---|
| 785 | if (win > 0) {
|
---|
| 786 | long adv;
|
---|
| 787 |
|
---|
| 788 | /*
|
---|
| 789 | * win: åä¿¡ãããã¡ã®ç©ºã容é
|
---|
| 790 | * MAX_TCP_WIN_SIZE: TCP ãããã® win ãã£ã¼ã«ãã«è¨å®ã§ããæ大å¤
|
---|
| 791 | * rcv_adv: åä¿¡ãæå¾
|
---|
| 792 | ãã¦ããæ大㮠SEQ
|
---|
| 793 | * rcv_nxt: åä¿¡ãæå¾
|
---|
| 794 | ãã¦ããæå°ã® SEQ
|
---|
| 795 | */
|
---|
| 796 | if (win < MAX_TCP_WIN_SIZE)
|
---|
| 797 | adv = win - (cep->rcv_adv - cep->rcv_nxt);
|
---|
| 798 | else
|
---|
| 799 | adv = MAX_TCP_WIN_SIZE - (cep->rcv_adv - cep->rcv_nxt);
|
---|
| 800 |
|
---|
| 801 | if (adv >= (long)(cep->maxseg * 2) ||
|
---|
| 802 | adv * 2 >= (long) cep->rbufsz) {
|
---|
| 803 | error = send_segment(&sendalot, cep, doff, win, (uint_t)len, flags);
|
---|
| 804 | continue;
|
---|
| 805 | }
|
---|
| 806 | }
|
---|
| 807 |
|
---|
| 808 | /*
|
---|
| 809 | * ACK ãéä¿¡ããã
|
---|
| 810 | */
|
---|
| 811 | if (cep->flags & TCP_CEP_FLG_ACK_NOW) {
|
---|
| 812 | error = send_segment(&sendalot, cep, doff, win, (uint_t)len, flags);
|
---|
| 813 | continue;
|
---|
| 814 | }
|
---|
| 815 |
|
---|
| 816 | if ( (flags & TCP_FLG_RST) ||
|
---|
| 817 | ((flags & TCP_FLG_SYN) && (cep->flags & TCP_CEP_FLG_NEED_SYN) == 0)) {
|
---|
| 818 | error = send_segment(&sendalot, cep, doff, win, (uint_t)len, flags);
|
---|
| 819 | continue;
|
---|
| 820 | }
|
---|
| 821 |
|
---|
| 822 | #ifdef TCP_CFG_EXTENTIONS
|
---|
| 823 |
|
---|
| 824 | if (SEQ_GT(cep->snd_up, cep->snd_una)) {
|
---|
| 825 | error = send_segment(&sendalot, cep, doff, win, (uint_t)len, flags);
|
---|
| 826 | continue;
|
---|
| 827 | }
|
---|
| 828 |
|
---|
| 829 | #endif /* of #ifdef TCP_CFG_EXTENTIONS */
|
---|
| 830 |
|
---|
| 831 | /*
|
---|
| 832 | * snd_nxt: 次ã«éä¿¡ãã SEQ
|
---|
| 833 | * snd_una: æªç¢ºèªã®æå°éä¿¡ SEQãã¾ãã¯ç¢ºèªãããæ大éä¿¡ SEQ
|
---|
| 834 | *
|
---|
| 835 | * ç¸æãã FIN ãåä¿¡ããã¾ã FIN ãéä¿¡ãã¦ããªããã
|
---|
| 836 | * éããã¼ã¿ããªãã¨ãã¯ãFIN ãç¸æã«å±ããããã
|
---|
| 837 | * ã»ã°ã¡ã³ããéä¿¡ããã
|
---|
| 838 | */
|
---|
| 839 | if ((flags & TCP_FLG_FIN) &&
|
---|
| 840 | ((cep->flags & TCP_CEP_FLG_SENT_FIN) == 0 || cep->snd_nxt == cep->snd_una)) {
|
---|
| 841 | error = send_segment(&sendalot, cep, doff, win, (uint_t)len, flags);
|
---|
| 842 | continue;
|
---|
| 843 | }
|
---|
| 844 |
|
---|
| 845 | /*
|
---|
| 846 | * éä¿¡ãã¹ããã¼ã¿ããããåéã¿ã¤ãã¨æç¶ã¿ã¤ããåãã¦ããã¨ãã¯
|
---|
| 847 | * æç¶ã¿ã¤ããè¨å®ããã
|
---|
| 848 | */
|
---|
| 849 | if (cep->swbuf_count && cep->timer[TCP_TIM_REXMT ] == 0 &&
|
---|
| 850 | cep->timer[TCP_TIM_PERSIST] == 0) {
|
---|
| 851 | cep->rxtshift = 0;
|
---|
| 852 | tcp_set_persist_timer(cep);
|
---|
| 853 | break;
|
---|
| 854 | }
|
---|
| 855 |
|
---|
| 856 | }
|
---|
| 857 | }
|
---|
| 858 |
|
---|
| 859 | #ifdef TCP_CFG_SWBUF_CSAVE
|
---|
| 860 |
|
---|
| 861 | /*
|
---|
| 862 | * tcptsk_alloc_swbufq -- éä¿¡ã¦ã£ã³ããããã¡å²ãå½ã¦
|
---|
| 863 | */
|
---|
| 864 |
|
---|
| 865 | static void
|
---|
| 866 | tcptsk_alloc_swbufq (T_TCP_CEP *cep)
|
---|
| 867 | {
|
---|
| 868 | ER error;
|
---|
| 869 | uint_t win;
|
---|
| 870 |
|
---|
| 871 | /*
|
---|
| 872 | * snd_wnd: ç¸æã®åä¿¡å¯è½ã¦ã£ã³ããµã¤ãº
|
---|
| 873 | * snd_cwnd: 輻輳ã¦ã£ã³ããµã¤ãº
|
---|
| 874 | *
|
---|
| 875 | * win: ã©ã¡ããå°ããã¦ã£ã³ããµã¤ãºã«è¨å®ããã
|
---|
| 876 | */
|
---|
| 877 | win = cep->snd_wnd < cep->snd_cwnd ? cep->snd_wnd : cep->snd_cwnd;
|
---|
| 878 |
|
---|
| 879 | /*
|
---|
| 880 | * ç¸æã®åä¿¡ã¦ã£ã³ããéãã¦ããå ´åã¯ãéãã¾ã§å¾
|
---|
| 881 | æ©ããã
|
---|
| 882 | */
|
---|
| 883 | if (win == 0) {
|
---|
| 884 | cep->flags = (cep->flags & ~TCP_CEP_FLG_WBCS_MASK) | TCP_CEP_FLG_WBCS_WOPEN_PEND;
|
---|
| 885 | }
|
---|
| 886 | else {
|
---|
| 887 |
|
---|
| 888 | #ifdef TCP_CFG_NON_BLOCKING
|
---|
| 889 |
|
---|
| 890 | /* ãã³ããããã³ã°ã³ã¼ã« */
|
---|
| 891 | if (!IS_PTR_DEFINED(cep->callback)) {
|
---|
| 892 | syslog(LOG_WARNING, "[TCP] no call back, CEP: %d.", GET_TCP_CEPID(cep));
|
---|
| 893 |
|
---|
| 894 | /* è¨æ¶ããã¦ããã¿ã¹ã¯ ID 㨠API æ©è½ã³ã¼ããã¯ãªã¢ã¼ããã*/
|
---|
| 895 | cep->snd_tskid = TA_NULL;
|
---|
| 896 | cep->snd_tfn = cep->snd_nblk_tfn = TFN_TCP_UNDEF;
|
---|
| 897 | return;
|
---|
| 898 | }
|
---|
| 899 |
|
---|
| 900 | #endif /* of #ifdef TCP_CFG_NON_BLOCKING */
|
---|
| 901 |
|
---|
| 902 | if ((error = tcp_get_segment(&cep->swbufq, cep, 0,
|
---|
| 903 | (uint_t) TCP_CFG_SWBUF_CSAVE_MIN_SIZE,
|
---|
| 904 | (uint_t)(TCP_CFG_SWBUF_CSAVE_MAX_SIZE - IF_IP_TCP_HDR_SIZE),
|
---|
| 905 | (ATR)(NBA_SEARCH_DESCENT |
|
---|
| 906 | NBA_RESERVE_TCP |
|
---|
| 907 | (GET_TCP_CEPID(cep) & NBA_ID_MASK)), TMO_POL)) != E_OK) {
|
---|
| 908 |
|
---|
| 909 | /* ãããã¯ã¼ã¯ãããã¡ãäºç´ããã*/
|
---|
| 910 | cep->flags = (cep->flags & ~TCP_CEP_FLG_WBCS_MASK) | TCP_CEP_FLG_WBCS_NBUF_PEND;
|
---|
| 911 | }
|
---|
| 912 | else {
|
---|
| 913 |
|
---|
| 914 | /* éä¿¡ã¦ã£ã³ããããã¡ãåæåããã*/
|
---|
| 915 | tcp_init_swbuf(cep);
|
---|
| 916 |
|
---|
| 917 | #ifdef TCP_CFG_NON_BLOCKING
|
---|
| 918 |
|
---|
| 919 | if (cep->snd_nblk_tfn == TFN_TCP_GET_BUF) {
|
---|
| 920 |
|
---|
| 921 | uint_t len;
|
---|
| 922 |
|
---|
| 923 | /* éä¿¡ã¦ã£ã³ããããã¡ã®æ¸ãè¾¼ã¿ã¢ãã¬ã¹ãè¨å®ããã*/
|
---|
| 924 | len = TCP_GET_SWBUF_ADDR(cep, cep->snd_p_buf);
|
---|
| 925 |
|
---|
| 926 | #ifdef TCP_CFG_NON_BLOCKING_COMPAT14
|
---|
| 927 |
|
---|
| 928 | /* ã³ã¼ã«ããã¯é¢æ°ãå¼ã³åºãã*/
|
---|
| 929 | (*cep->callback)(GET_TCP_CEPID(cep), cep->snd_nblk_tfn, (void*)(uint32_t)len);
|
---|
| 930 |
|
---|
| 931 | #else /* of #ifdef TCP_CFG_NON_BLOCKING_COMPAT14 */
|
---|
| 932 |
|
---|
| 933 | /* ã³ã¼ã«ããã¯é¢æ°ãå¼ã³åºãã*/
|
---|
| 934 | (*cep->callback)(GET_TCP_CEPID(cep), cep->snd_nblk_tfn, (void*)&len);
|
---|
| 935 |
|
---|
| 936 | #endif /* of #ifdef TCP_CFG_NON_BLOCKING_COMPAT14 */
|
---|
| 937 |
|
---|
| 938 |
|
---|
| 939 | /* è¨æ¶ããã¦ããã¿ã¹ã¯ ID 㨠API æ©è½ã³ã¼ããã¯ãªã¢ã¼ããã*/
|
---|
| 940 | cep->snd_tskid = TA_NULL;
|
---|
| 941 | cep->snd_tfn = cep->snd_nblk_tfn = TFN_TCP_UNDEF;
|
---|
| 942 | }
|
---|
| 943 |
|
---|
| 944 | else { /* cep->snd_nblk_tfn == TFN_TCP_SND_DAT || */
|
---|
| 945 | /* cep->snd_nblk_tfn == TFN_TCP_SND_OOB */
|
---|
| 946 |
|
---|
| 947 | uint_t len;
|
---|
| 948 |
|
---|
| 949 | /* éä¿¡ã¦ã£ã³ããããã¡ã«ãã¼ã¿ãæ¸ãè¾¼ãã*/
|
---|
| 950 | len = TCP_WRITE_SWBUF(cep, cep->snd_data, (uint_t)cep->snd_len);
|
---|
| 951 |
|
---|
| 952 | #ifdef TCP_CFG_EXTENTIONS
|
---|
| 953 |
|
---|
| 954 | /* éä¿¡ç·æ¥ãã¤ã³ã¿ãè¨å®ããã*/
|
---|
| 955 | if (cep->snd_nblk_tfn == TFN_TCP_SND_OOB)
|
---|
| 956 | cep->snd_up = cep->snd_una + len;
|
---|
| 957 |
|
---|
| 958 | #endif /* of #ifdef TCP_CFG_EXTENTIONS */
|
---|
| 959 |
|
---|
| 960 | /* ãã©ã°ããéä¿¡å¯è½ã«è¨å®ããå¼·å¶çã«éä¿¡ããã*/
|
---|
| 961 | cep->flags |= TCP_CEP_FLG_FORCE | TCP_CEP_FLG_FORCE_CLEAR | TCP_CEP_FLG_POST_OUTPUT;
|
---|
| 962 | #ifdef TCP_CFG_NON_BLOCKING_COMPAT14
|
---|
| 963 |
|
---|
| 964 | /* ã³ã¼ã«ããã¯é¢æ°ãå¼ã³åºãã*/
|
---|
| 965 | (*cep->callback)(GET_TCP_CEPID(cep), cep->snd_nblk_tfn, (void*)(uint32_t)len);
|
---|
| 966 |
|
---|
| 967 | #else /* of #ifdef TCP_CFG_NON_BLOCKING_COMPAT14 */
|
---|
| 968 |
|
---|
| 969 | /* ã³ã¼ã«ããã¯é¢æ°ãå¼ã³åºãã*/
|
---|
| 970 | (*cep->callback)(GET_TCP_CEPID(cep), cep->snd_nblk_tfn, (void*)&len);
|
---|
| 971 |
|
---|
| 972 | #endif /* of #ifdef TCP_CFG_NON_BLOCKING_COMPAT14 */
|
---|
| 973 |
|
---|
| 974 |
|
---|
| 975 | /* è¨æ¶ããã¦ããã¿ã¹ã¯ ID 㨠API æ©è½ã³ã¼ããã¯ãªã¢ã¼ããã*/
|
---|
| 976 | cep->snd_tskid = TA_NULL;
|
---|
| 977 | cep->snd_tfn = cep->snd_nblk_tfn = TFN_TCP_UNDEF;
|
---|
| 978 | }
|
---|
| 979 |
|
---|
| 980 | #endif /* of #ifdef TCP_CFG_NON_BLOCKING */
|
---|
| 981 |
|
---|
| 982 | }
|
---|
| 983 | }
|
---|
| 984 | }
|
---|
| 985 |
|
---|
| 986 | /*
|
---|
| 987 | * tcptsk_free_swbufq -- éä¿¡ã¦ã£ã³ããããã¡éæ¾
|
---|
| 988 | */
|
---|
| 989 |
|
---|
| 990 | static void
|
---|
| 991 | tcptsk_free_swbufq (T_TCP_CEP *cep)
|
---|
| 992 | {
|
---|
| 993 | /*
|
---|
| 994 | * å信確èªãå®äºãããããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ããã®
|
---|
| 995 | * åºåãå®äºããã¨ãã¯ãéä¿¡ã¦ã£ã³ããããã¡ãã¥ã¼ã解æ¾ããã
|
---|
| 996 | */
|
---|
| 997 |
|
---|
| 998 | /* éä¿¡ã¦ã£ã³ããããã¡ã®ä½¿ç¨ä¸ãµã¤ãºããªã»ããããã*/
|
---|
| 999 | cep->swbuf_count = 0;
|
---|
| 1000 |
|
---|
| 1001 | /* éä¿¡ã¦ã£ã³ããããã¡ãã¥ã¼ã®ãããã¯ã¼ã¯ãããã¡ã解æ¾ããã*/
|
---|
| 1002 | syscall(rel_net_buf(cep->swbufq));
|
---|
| 1003 | cep->swbufq = NULL;
|
---|
| 1004 |
|
---|
| 1005 | /* ãã©ã°ã空ãã«è¨å®ããã*/
|
---|
| 1006 | cep->flags = (cep->flags & ~TCP_CEP_FLG_WBCS_MASK) | TCP_CEP_FLG_WBCS_FREE;
|
---|
| 1007 |
|
---|
| 1008 | /* éä¿¡ã¦ã£ã³ããããã¡ã«ç©ºããã§ãããã¨ãç¥ãããã*/
|
---|
| 1009 | syscall(set_flg(cep->snd_flgid, TCP_CEP_EVT_SWBUF_READY));
|
---|
| 1010 |
|
---|
| 1011 | /* éä¿¡ã¦ã£ã³ããããã¡ã®ç©ºãå¾
|
---|
| 1012 | ã¡ã®ã¨ãã¯ãTCP åºåã¿ã¹ã¯ãèµ·åããã*/
|
---|
| 1013 | if ((cep->flags & TCP_CEP_FLG_WBCS_NBUF_REQ) != 0) {
|
---|
| 1014 | sig_sem(SEM_TCP_POST_OUTPUT);
|
---|
| 1015 | }
|
---|
| 1016 | }
|
---|
| 1017 |
|
---|
| 1018 | #endif /* of #ifdef TCP_CFG_SWBUF_CSAVE */
|
---|
| 1019 |
|
---|
| 1020 | /*
|
---|
| 1021 | * TCP åºåã¿ã¹ã¯
|
---|
| 1022 | */
|
---|
| 1023 |
|
---|
| 1024 | void
|
---|
| 1025 | tcp_output_task (intptr_t exinf)
|
---|
| 1026 | {
|
---|
| 1027 | static int_t last_ix = 0;
|
---|
| 1028 |
|
---|
| 1029 | T_TCP_CEP *cep;
|
---|
| 1030 | ID tskid;
|
---|
| 1031 | int_t ix, sel_ix;
|
---|
| 1032 |
|
---|
| 1033 | get_tid(&tskid);
|
---|
| 1034 | syslog(LOG_NOTICE, "[TCP OUTPUT:%d] started.", tskid);
|
---|
| 1035 |
|
---|
| 1036 | tcp_init();
|
---|
| 1037 |
|
---|
| 1038 | #ifdef SUPPORT_INET6
|
---|
| 1039 |
|
---|
| 1040 | /* IPv6 ã®ã¹ãã¼ãã¬ã¹ã»ã¢ãã¬ã¹èªåè¨å®ãå®è¡ããã*/
|
---|
| 1041 | in6_if_up(IF_GET_IFNET());
|
---|
| 1042 |
|
---|
| 1043 | #endif /* of #ifdef SUPPORT_INET6 */
|
---|
| 1044 |
|
---|
| 1045 | while (true) {
|
---|
| 1046 |
|
---|
| 1047 | /* åºåããã¹ããããã¾ã§å¾
|
---|
| 1048 | ã¤ã*/
|
---|
| 1049 | syscall(wai_sem(SEM_TCP_POST_OUTPUT));
|
---|
| 1050 |
|
---|
| 1051 | if (++ last_ix == tmax_tcp_cepid)
|
---|
| 1052 | last_ix = 0;
|
---|
| 1053 | sel_ix = ix = last_ix;
|
---|
| 1054 | do {
|
---|
| 1055 | cep = &tcp_cep[ix];
|
---|
| 1056 |
|
---|
| 1057 | #ifdef TCP_CFG_SWBUF_CSAVE
|
---|
| 1058 |
|
---|
| 1059 | if ((cep->flags & TCP_CEP_FLG_WBCS_NBUF_REQ) != 0 &&
|
---|
| 1060 | ((cep->flags & TCP_CEP_FLG_WBCS_MASK) == TCP_CEP_FLG_WBCS_FREE ||
|
---|
| 1061 | (cep->flags & TCP_CEP_FLG_WBCS_MASK) == TCP_CEP_FLG_WBCS_NBUF_RSVD)) {
|
---|
| 1062 | tcptsk_alloc_swbufq(cep);
|
---|
| 1063 | sel_ix = ix;
|
---|
| 1064 | }
|
---|
| 1065 |
|
---|
| 1066 | if ((cep->flags & TCP_CEP_FLG_WBCS_MASK) == TCP_CEP_FLG_WBCS_ACKED &&
|
---|
| 1067 | (cep->swbufq->flags & NB_FLG_NOREL_IFOUT) == 0) {
|
---|
| 1068 | tcptsk_free_swbufq(cep);
|
---|
| 1069 | sel_ix = ix;
|
---|
| 1070 | }
|
---|
| 1071 |
|
---|
| 1072 | /*
|
---|
| 1073 | * ãããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ããéä¿¡ãçµãã£ã¦ããªãã¨ãã¯ã
|
---|
| 1074 | * éä¿¡ãäºç´ããã
|
---|
| 1075 | */
|
---|
| 1076 | if (cep->flags & TCP_CEP_FLG_POST_OUTPUT &&
|
---|
| 1077 | (cep->flags & TCP_CEP_FLG_WBCS_MASK) >= TCP_CEP_FLG_WBCS_SENT) {
|
---|
| 1078 | syscall(wai_sem(cep->semid_lock));
|
---|
| 1079 | if (cep->swbufq == NULL)
|
---|
| 1080 | cep->flags &= ~TCP_CEP_FLG_POST_OUTPUT;
|
---|
| 1081 | else if (cep->swbufq->flags & NB_FLG_NOREL_IFOUT) {
|
---|
| 1082 | cep->flags &= ~TCP_CEP_FLG_POST_OUTPUT;
|
---|
| 1083 | cep->flags |= TCP_CEP_FLG_RESERVE_OUTPUT;
|
---|
| 1084 | }
|
---|
| 1085 | syscall(sig_sem(cep->semid_lock));
|
---|
| 1086 | }
|
---|
| 1087 |
|
---|
| 1088 | /*
|
---|
| 1089 | * éä¿¡äºç´ä¸ã«ããããã¯ã¼ã¯ã¤ã³ã¿ãã§ã¼ã¹ããéä¿¡ãçµäºãããã
|
---|
| 1090 | * éä¿¡ãéå§ããããã ããå®å
|
---|
| 1091 | ¨ã«éä¿¡ãçµäºããã¨ãã¯ä½ãããªãã
|
---|
| 1092 | */
|
---|
| 1093 | if (cep->flags & TCP_CEP_FLG_RESERVE_OUTPUT) {
|
---|
| 1094 | syscall(wai_sem(cep->semid_lock));
|
---|
| 1095 | if (cep->swbufq != NULL && (cep->swbufq->flags & NB_FLG_NOREL_IFOUT) == 0) {
|
---|
| 1096 | cep->flags |= TCP_CEP_FLG_POST_OUTPUT;
|
---|
| 1097 | }
|
---|
| 1098 | syscall(sig_sem(cep->semid_lock));
|
---|
| 1099 | cep->flags &= ~TCP_CEP_FLG_RESERVE_OUTPUT;
|
---|
| 1100 | }
|
---|
| 1101 |
|
---|
| 1102 | #endif /* of #ifdef TCP_CFG_SWBUF_CSAVE */
|
---|
| 1103 |
|
---|
| 1104 | if (cep->flags & TCP_CEP_FLG_POST_OUTPUT) {
|
---|
| 1105 |
|
---|
| 1106 | cep->flags &= ~TCP_CEP_FLG_POST_OUTPUT;
|
---|
| 1107 |
|
---|
| 1108 | #ifdef TCP_CFG_NON_BLOCKING
|
---|
| 1109 |
|
---|
| 1110 | if (cep->snd_nblk_tfn == TFN_TCP_CON_CEP && cep->myaddr.portno == TCP_PORTANY) {
|
---|
| 1111 | ER error;
|
---|
| 1112 |
|
---|
| 1113 | /*
|
---|
| 1114 | * tcp_con_cep ã®ãã³ããããã³ã°ã³ã¼ã«ã§ã
|
---|
| 1115 | * æªå²å½ã®ã®å ´åã¯ããã¼ãçªå·ãå²ãå½ã¦ãã
|
---|
| 1116 | * p_myaddr ã NADR (-1) ãã
|
---|
| 1117 | * èªãã¼ãçªå·ã TCP_PORTANY ãªããèªåã§å²ãå½ã¦ãã
|
---|
| 1118 | */
|
---|
| 1119 | if (cep->p_myaddr == NADR || cep->p_myaddr->portno == TCP_PORTANY)
|
---|
| 1120 | tcp_alloc_auto_port(cep);
|
---|
| 1121 | else if ((error = tcp_alloc_port(cep, cep->p_myaddr->portno)) != E_OK) {
|
---|
| 1122 |
|
---|
| 1123 | if (IS_PTR_DEFINED(cep->callback))
|
---|
| 1124 |
|
---|
| 1125 | #ifdef TCP_CFG_NON_BLOCKING_COMPAT14
|
---|
| 1126 |
|
---|
| 1127 | (*cep->callback)(GET_TCP_CEPID(cep), cep->snd_nblk_tfn, (void*)error);
|
---|
| 1128 |
|
---|
| 1129 | #else /* of #ifdef TCP_CFG_NON_BLOCKING_COMPAT14 */
|
---|
| 1130 |
|
---|
| 1131 | (*cep->callback)(GET_TCP_CEPID(cep), cep->snd_nblk_tfn, (void*)&error);
|
---|
| 1132 |
|
---|
| 1133 | #endif /* of #ifdef TCP_CFG_NON_BLOCKING_COMPAT14 */
|
---|
| 1134 |
|
---|
| 1135 | else
|
---|
| 1136 | syslog(LOG_WARNING, "[TCP] no call back, CEP: %d.", GET_TCP_CEPID(cep));
|
---|
| 1137 |
|
---|
| 1138 | /* è¨æ¶ããã¦ããã¿ã¹ã¯ ID 㨠API æ©è½ã³ã¼ããã¯ãªã¢ã¼ããã*/
|
---|
| 1139 | cep->snd_tfn = cep->snd_nblk_tfn = TFN_TCP_UNDEF;
|
---|
| 1140 | cep->snd_tskid = TA_NULL;
|
---|
| 1141 | continue;
|
---|
| 1142 | }
|
---|
| 1143 | }
|
---|
| 1144 |
|
---|
| 1145 | #endif /* of #ifdef TCP_CFG_NON_BLOCKING */
|
---|
| 1146 |
|
---|
| 1147 | tcp_output(cep);
|
---|
| 1148 |
|
---|
| 1149 | if (cep->flags & TCP_CEP_FLG_CLOSE_AFTER_OUTPUT) {
|
---|
| 1150 | /* ã³ãã¯ã·ã§ã³ãéããã*/
|
---|
| 1151 | tcp_close(cep);
|
---|
| 1152 | cep->flags &= ~TCP_CEP_FLG_CLOSE_AFTER_OUTPUT;
|
---|
| 1153 | }
|
---|
| 1154 |
|
---|
| 1155 | if (cep->flags & TCP_CEP_FLG_RESTORE_NEXT_OUTPUT) {
|
---|
| 1156 | /* snd_nxt ãå
|
---|
| 1157 | ã«æ»ãã*/
|
---|
| 1158 | if (SEQ_GT(cep->snd_old_nxt, cep->snd_nxt))
|
---|
| 1159 | cep->snd_nxt = cep->snd_old_nxt;
|
---|
| 1160 | cep->flags &= ~TCP_CEP_FLG_RESTORE_NEXT_OUTPUT;
|
---|
| 1161 | }
|
---|
| 1162 |
|
---|
| 1163 | sel_ix = ix;
|
---|
| 1164 | }
|
---|
| 1165 |
|
---|
| 1166 | if (++ ix == tmax_tcp_cepid)
|
---|
| 1167 | ix = 0;
|
---|
| 1168 | } while (ix != last_ix);
|
---|
| 1169 |
|
---|
| 1170 | /* 次åã¯ãå¦çããé信端ç¹ãå¾åãã«ããã*/
|
---|
| 1171 | last_ix = sel_ix;
|
---|
| 1172 | }
|
---|
| 1173 | }
|
---|
| 1174 |
|
---|
| 1175 | #endif /* of #ifdef SUPPORT_TCP */
|
---|