1 | /**
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2 | * @file
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3 | * Transmission Control Protocol for IP
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4 | *
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5 | * This file contains common functions for the TCP implementation, such as functinos
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6 | * for manipulating the data structures and the TCP timer functions. TCP functions
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7 | * related to input and output is found in tcp_in.c and tcp_out.c respectively.
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8 | *
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9 | */
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10 |
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11 | /*
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12 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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13 | * All rights reserved.
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14 | *
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15 | * Redistribution and use in source and binary forms, with or without modification,
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16 | * are permitted provided that the following conditions are met:
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17 | *
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18 | * 1. Redistributions of source code must retain the above copyright notice,
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19 | * this list of conditions and the following disclaimer.
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20 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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21 | * this list of conditions and the following disclaimer in the documentation
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22 | * and/or other materials provided with the distribution.
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23 | * 3. The name of the author may not be used to endorse or promote products
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24 | * derived from this software without specific prior written permission.
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25 | *
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26 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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27 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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28 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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29 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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30 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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31 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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32 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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33 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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34 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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35 | * OF SUCH DAMAGE.
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36 | *
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37 | * This file is part of the lwIP TCP/IP stack.
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38 | *
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39 | * Author: Adam Dunkels <adam@sics.se>
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40 | *
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41 | */
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42 |
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43 | #include "lwip/opt.h"
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44 |
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45 | #if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
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46 |
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47 | #include "lwip/def.h"
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48 | #include "lwip/mem.h"
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49 | #include "lwip/memp.h"
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50 | #include "lwip/snmp.h"
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51 | #include "lwip/tcp.h"
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52 | #include "lwip/tcp_impl.h"
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53 | #include "lwip/debug.h"
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54 | #include "lwip/stats.h"
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55 |
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56 | #include <string.h>
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57 |
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58 | #ifndef TCP_LOCAL_PORT_RANGE_START
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59 | /* From http://www.iana.org/assignments/port-numbers:
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60 | "The Dynamic and/or Private Ports are those from 49152 through 65535" */
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61 | #define TCP_LOCAL_PORT_RANGE_START 0xc000
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62 | #define TCP_LOCAL_PORT_RANGE_END 0xffff
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63 | #define TCP_ENSURE_LOCAL_PORT_RANGE(port) (((port) & ~TCP_LOCAL_PORT_RANGE_START) + TCP_LOCAL_PORT_RANGE_START)
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64 | #endif
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65 |
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66 | #if LWIP_TCP_KEEPALIVE
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67 | #define TCP_KEEP_DUR(pcb) ((pcb)->keep_cnt * (pcb)->keep_intvl)
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68 | #define TCP_KEEP_INTVL(pcb) ((pcb)->keep_intvl)
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69 | #else /* LWIP_TCP_KEEPALIVE */
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70 | #define TCP_KEEP_DUR(pcb) TCP_MAXIDLE
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71 | #define TCP_KEEP_INTVL(pcb) TCP_KEEPINTVL_DEFAULT
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72 | #endif /* LWIP_TCP_KEEPALIVE */
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73 |
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74 | const char * const tcp_state_str[] = {
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75 | "CLOSED",
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76 | "LISTEN",
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77 | "SYN_SENT",
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78 | "SYN_RCVD",
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79 | "ESTABLISHED",
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80 | "FIN_WAIT_1",
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81 | "FIN_WAIT_2",
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82 | "CLOSE_WAIT",
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83 | "CLOSING",
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84 | "LAST_ACK",
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85 | "TIME_WAIT"
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86 | };
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87 |
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88 | /* last local TCP port */
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89 | static u16_t tcp_port = TCP_LOCAL_PORT_RANGE_START;
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90 |
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91 | /* Incremented every coarse grained timer shot (typically every 500 ms). */
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92 | u32_t tcp_ticks;
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93 | const u8_t tcp_backoff[13] =
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94 | { 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
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95 | /* Times per slowtmr hits */
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96 | const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
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97 |
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98 | /* The TCP PCB lists. */
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99 |
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100 | /** List of all TCP PCBs bound but not yet (connected || listening) */
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101 | struct tcp_pcb *tcp_bound_pcbs;
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102 | /** List of all TCP PCBs in LISTEN state */
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103 | union tcp_listen_pcbs_t tcp_listen_pcbs;
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104 | /** List of all TCP PCBs that are in a state in which
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105 | * they accept or send data. */
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106 | struct tcp_pcb *tcp_active_pcbs;
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107 | /** List of all TCP PCBs in TIME-WAIT state */
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108 | struct tcp_pcb *tcp_tw_pcbs;
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109 |
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110 | #define NUM_TCP_PCB_LISTS 4
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111 | #define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
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112 | /** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
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113 | struct tcp_pcb ** const tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
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114 | &tcp_active_pcbs, &tcp_tw_pcbs};
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115 |
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116 | /** Only used for temporary storage. */
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117 | struct tcp_pcb *tcp_tmp_pcb;
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118 |
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119 | u8_t tcp_active_pcbs_changed;
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120 |
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121 | /** Timer counter to handle calling slow-timer from tcp_tmr() */
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122 | static u8_t tcp_timer;
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123 | static u8_t tcp_timer_ctr;
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124 | static u16_t tcp_new_port(void);
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125 |
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126 | /**
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127 | * Initialize this module.
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128 | */
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129 | void
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130 | tcp_init(void)
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131 | {
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132 | #if LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS && defined(LWIP_RAND)
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133 | tcp_port = TCP_ENSURE_LOCAL_PORT_RANGE(LWIP_RAND());
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134 | #endif /* LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS && defined(LWIP_RAND) */
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135 | }
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136 |
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137 | /**
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138 | * Called periodically to dispatch TCP timers.
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139 | */
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140 | void
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141 | tcp_tmr(void)
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142 | {
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143 | /* Call tcp_fasttmr() every 250 ms */
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144 | tcp_fasttmr();
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145 |
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146 | if (++tcp_timer & 1) {
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147 | /* Call tcp_tmr() every 500 ms, i.e., every other timer
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148 | tcp_tmr() is called. */
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149 | tcp_slowtmr();
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150 | }
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151 | }
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152 |
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153 | /**
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154 | * Closes the TX side of a connection held by the PCB.
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155 | * For tcp_close(), a RST is sent if the application didn't receive all data
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156 | * (tcp_recved() not called for all data passed to recv callback).
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157 | *
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158 | * Listening pcbs are freed and may not be referenced any more.
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159 | * Connection pcbs are freed if not yet connected and may not be referenced
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160 | * any more. If a connection is established (at least SYN received or in
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161 | * a closing state), the connection is closed, and put in a closing state.
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162 | * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
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163 | * unsafe to reference it.
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164 | *
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165 | * @param pcb the tcp_pcb to close
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166 | * @return ERR_OK if connection has been closed
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167 | * another err_t if closing failed and pcb is not freed
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168 | */
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169 | static err_t
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170 | tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
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171 | {
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172 | err_t err;
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173 |
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174 | if (rst_on_unacked_data && ((pcb->state == ESTABLISHED) || (pcb->state == CLOSE_WAIT))) {
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175 | if ((pcb->refused_data != NULL) || (pcb->rcv_wnd != TCP_WND)) {
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176 | /* Not all data received by application, send RST to tell the remote
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177 | side about this. */
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178 | LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
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179 |
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180 | /* don't call tcp_abort here: we must not deallocate the pcb since
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181 | that might not be expected when calling tcp_close */
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182 | tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
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183 | pcb->local_port, pcb->remote_port);
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184 |
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185 | tcp_pcb_purge(pcb);
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186 | TCP_RMV_ACTIVE(pcb);
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187 | if (pcb->state == ESTABLISHED) {
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188 | /* move to TIME_WAIT since we close actively */
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189 | pcb->state = TIME_WAIT;
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190 | TCP_REG(&tcp_tw_pcbs, pcb);
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191 | } else {
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192 | /* CLOSE_WAIT: deallocate the pcb since we already sent a RST for it */
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193 | memp_free(MEMP_TCP_PCB, pcb);
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194 | }
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195 | return ERR_OK;
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196 | }
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197 | }
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198 |
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199 | switch (pcb->state) {
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200 | case CLOSED:
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201 | /* Closing a pcb in the CLOSED state might seem erroneous,
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202 | * however, it is in this state once allocated and as yet unused
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203 | * and the user needs some way to free it should the need arise.
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204 | * Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
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205 | * or for a pcb that has been used and then entered the CLOSED state
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206 | * is erroneous, but this should never happen as the pcb has in those cases
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207 | * been freed, and so any remaining handles are bogus. */
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208 | err = ERR_OK;
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209 | if (pcb->local_port != 0) {
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210 | TCP_RMV(&tcp_bound_pcbs, pcb);
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211 | }
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212 | memp_free(MEMP_TCP_PCB, pcb);
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213 | pcb = NULL;
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214 | break;
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215 | case LISTEN:
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216 | err = ERR_OK;
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217 | tcp_pcb_remove(&tcp_listen_pcbs.pcbs, pcb);
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218 | memp_free(MEMP_TCP_PCB_LISTEN, pcb);
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219 | pcb = NULL;
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220 | break;
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221 | case SYN_SENT:
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222 | err = ERR_OK;
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223 | TCP_PCB_REMOVE_ACTIVE(pcb);
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224 | memp_free(MEMP_TCP_PCB, pcb);
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225 | pcb = NULL;
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226 | snmp_inc_tcpattemptfails();
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227 | break;
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228 | case SYN_RCVD:
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229 | err = tcp_send_fin(pcb);
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230 | if (err == ERR_OK) {
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231 | snmp_inc_tcpattemptfails();
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232 | pcb->state = FIN_WAIT_1;
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233 | }
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234 | break;
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235 | case ESTABLISHED:
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236 | err = tcp_send_fin(pcb);
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237 | if (err == ERR_OK) {
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238 | snmp_inc_tcpestabresets();
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239 | pcb->state = FIN_WAIT_1;
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240 | }
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241 | break;
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242 | case CLOSE_WAIT:
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243 | err = tcp_send_fin(pcb);
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244 | if (err == ERR_OK) {
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245 | snmp_inc_tcpestabresets();
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246 | pcb->state = LAST_ACK;
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247 | }
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248 | break;
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249 | default:
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250 | /* Has already been closed, do nothing. */
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251 | err = ERR_OK;
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252 | pcb = NULL;
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253 | break;
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254 | }
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255 |
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256 | if (pcb != NULL && err == ERR_OK) {
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257 | /* To ensure all data has been sent when tcp_close returns, we have
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258 | to make sure tcp_output doesn't fail.
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259 | Since we don't really have to ensure all data has been sent when tcp_close
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260 | returns (unsent data is sent from tcp timer functions, also), we don't care
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261 | for the return value of tcp_output for now. */
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262 | /* @todo: When implementing SO_LINGER, this must be changed somehow:
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263 | If SOF_LINGER is set, the data should be sent and acked before close returns.
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264 | This can only be valid for sequential APIs, not for the raw API. */
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265 | tcp_output(pcb);
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266 | }
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267 | return err;
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268 | }
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269 |
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270 | /**
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271 | * Closes the connection held by the PCB.
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272 | *
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273 | * Listening pcbs are freed and may not be referenced any more.
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274 | * Connection pcbs are freed if not yet connected and may not be referenced
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275 | * any more. If a connection is established (at least SYN received or in
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276 | * a closing state), the connection is closed, and put in a closing state.
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277 | * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
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278 | * unsafe to reference it (unless an error is returned).
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279 | *
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280 | * @param pcb the tcp_pcb to close
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281 | * @return ERR_OK if connection has been closed
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282 | * another err_t if closing failed and pcb is not freed
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283 | */
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284 | err_t
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285 | tcp_close(struct tcp_pcb *pcb)
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286 | {
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287 | #if TCP_DEBUG
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288 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
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289 | tcp_debug_print_state(pcb->state);
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290 | #endif /* TCP_DEBUG */
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291 |
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292 | if (pcb->state != LISTEN) {
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293 | /* Set a flag not to receive any more data... */
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294 | pcb->flags |= TF_RXCLOSED;
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295 | }
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296 | /* ... and close */
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297 | return tcp_close_shutdown(pcb, 1);
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298 | }
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299 |
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300 | /**
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301 | * Causes all or part of a full-duplex connection of this PCB to be shut down.
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302 | * This doesn't deallocate the PCB unless shutting down both sides!
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303 | * Shutting down both sides is the same as calling tcp_close, so if it succeds,
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304 | * the PCB should not be referenced any more.
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305 | *
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306 | * @param pcb PCB to shutdown
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307 | * @param shut_rx shut down receive side if this is != 0
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308 | * @param shut_tx shut down send side if this is != 0
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309 | * @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
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310 | * another err_t on error.
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311 | */
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312 | err_t
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313 | tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
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314 | {
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315 | if (pcb->state == LISTEN) {
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316 | return ERR_CONN;
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317 | }
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318 | if (shut_rx) {
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319 | /* shut down the receive side: set a flag not to receive any more data... */
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320 | pcb->flags |= TF_RXCLOSED;
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321 | if (shut_tx) {
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322 | /* shutting down the tx AND rx side is the same as closing for the raw API */
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323 | return tcp_close_shutdown(pcb, 1);
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324 | }
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325 | /* ... and free buffered data */
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326 | if (pcb->refused_data != NULL) {
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327 | pbuf_free(pcb->refused_data);
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328 | pcb->refused_data = NULL;
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329 | }
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330 | }
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331 | if (shut_tx) {
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332 | /* This can't happen twice since if it succeeds, the pcb's state is changed.
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333 | Only close in these states as the others directly deallocate the PCB */
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334 | switch (pcb->state) {
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335 | case SYN_RCVD:
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336 | case ESTABLISHED:
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337 | case CLOSE_WAIT:
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338 | return tcp_close_shutdown(pcb, shut_rx);
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339 | default:
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340 | /* Not (yet?) connected, cannot shutdown the TX side as that would bring us
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341 | into CLOSED state, where the PCB is deallocated. */
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342 | return ERR_CONN;
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343 | }
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344 | }
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345 | return ERR_OK;
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346 | }
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347 |
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348 | /**
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349 | * Abandons a connection and optionally sends a RST to the remote
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350 | * host. Deletes the local protocol control block. This is done when
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351 | * a connection is killed because of shortage of memory.
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352 | *
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353 | * @param pcb the tcp_pcb to abort
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354 | * @param reset boolean to indicate whether a reset should be sent
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355 | */
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356 | void
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357 | tcp_abandon(struct tcp_pcb *pcb, int reset)
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358 | {
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359 | u32_t seqno, ackno;
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360 | #if LWIP_CALLBACK_API
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361 | tcp_err_fn errf;
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362 | #endif /* LWIP_CALLBACK_API */
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363 | void *errf_arg;
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364 |
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365 | /* pcb->state LISTEN not allowed here */
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366 | LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
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367 | pcb->state != LISTEN);
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368 | /* Figure out on which TCP PCB list we are, and remove us. If we
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369 | are in an active state, call the receive function associated with
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370 | the PCB with a NULL argument, and send an RST to the remote end. */
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371 | if (pcb->state == TIME_WAIT) {
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372 | tcp_pcb_remove(&tcp_tw_pcbs, pcb);
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373 | memp_free(MEMP_TCP_PCB, pcb);
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374 | } else {
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375 | seqno = pcb->snd_nxt;
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376 | ackno = pcb->rcv_nxt;
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377 | #if LWIP_CALLBACK_API
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378 | errf = pcb->errf;
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379 | #endif /* LWIP_CALLBACK_API */
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380 | errf_arg = pcb->callback_arg;
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381 | TCP_PCB_REMOVE_ACTIVE(pcb);
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382 | if (pcb->unacked != NULL) {
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383 | tcp_segs_free(pcb->unacked);
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384 | }
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385 | if (pcb->unsent != NULL) {
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386 | tcp_segs_free(pcb->unsent);
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387 | }
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388 | #if TCP_QUEUE_OOSEQ
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389 | if (pcb->ooseq != NULL) {
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390 | tcp_segs_free(pcb->ooseq);
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391 | }
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392 | #endif /* TCP_QUEUE_OOSEQ */
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393 | if (reset) {
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394 | LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
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395 | tcp_rst(seqno, ackno, &pcb->local_ip, &pcb->remote_ip, pcb->local_port, pcb->remote_port);
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396 | }
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397 | memp_free(MEMP_TCP_PCB, pcb);
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398 | TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
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399 | }
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400 | }
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401 |
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402 | /**
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403 | * Aborts the connection by sending a RST (reset) segment to the remote
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404 | * host. The pcb is deallocated. This function never fails.
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405 | *
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406 | * ATTENTION: When calling this from one of the TCP callbacks, make
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407 | * sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
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408 | * or you will risk accessing deallocated memory or memory leaks!
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409 | *
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410 | * @param pcb the tcp pcb to abort
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411 | */
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412 | void
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413 | tcp_abort(struct tcp_pcb *pcb)
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414 | {
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415 | tcp_abandon(pcb, 1);
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416 | }
|
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417 |
|
---|
418 | /**
|
---|
419 | * Binds the connection to a local portnumber and IP address. If the
|
---|
420 | * IP address is not given (i.e., ipaddr == NULL), the IP address of
|
---|
421 | * the outgoing network interface is used instead.
|
---|
422 | *
|
---|
423 | * @param pcb the tcp_pcb to bind (no check is done whether this pcb is
|
---|
424 | * already bound!)
|
---|
425 | * @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
|
---|
426 | * to any local address
|
---|
427 | * @param port the local port to bind to
|
---|
428 | * @return ERR_USE if the port is already in use
|
---|
429 | * ERR_VAL if bind failed because the PCB is not in a valid state
|
---|
430 | * ERR_OK if bound
|
---|
431 | */
|
---|
432 | err_t
|
---|
433 | tcp_bind(struct tcp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
|
---|
434 | {
|
---|
435 | int i;
|
---|
436 | int max_pcb_list = NUM_TCP_PCB_LISTS;
|
---|
437 | struct tcp_pcb *cpcb;
|
---|
438 |
|
---|
439 | LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_VAL);
|
---|
440 |
|
---|
441 | #if SO_REUSE
|
---|
442 | /* Unless the REUSEADDR flag is set,
|
---|
443 | we have to check the pcbs in TIME-WAIT state, also.
|
---|
444 | We do not dump TIME_WAIT pcb's; they can still be matched by incoming
|
---|
445 | packets using both local and remote IP addresses and ports to distinguish.
|
---|
446 | */
|
---|
447 | if (ip_get_option(pcb, SOF_REUSEADDR)) {
|
---|
448 | max_pcb_list = NUM_TCP_PCB_LISTS_NO_TIME_WAIT;
|
---|
449 | }
|
---|
450 | #endif /* SO_REUSE */
|
---|
451 |
|
---|
452 | if (port == 0) {
|
---|
453 | port = tcp_new_port();
|
---|
454 | if (port == 0) {
|
---|
455 | return ERR_BUF;
|
---|
456 | }
|
---|
457 | }
|
---|
458 |
|
---|
459 | /* Check if the address already is in use (on all lists) */
|
---|
460 | for (i = 0; i < max_pcb_list; i++) {
|
---|
461 | for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
|
---|
462 | if (cpcb->local_port == port) {
|
---|
463 | #if SO_REUSE
|
---|
464 | /* Omit checking for the same port if both pcbs have REUSEADDR set.
|
---|
465 | For SO_REUSEADDR, the duplicate-check for a 5-tuple is done in
|
---|
466 | tcp_connect. */
|
---|
467 | if (!ip_get_option(pcb, SOF_REUSEADDR) ||
|
---|
468 | !ip_get_option(cpcb, SOF_REUSEADDR))
|
---|
469 | #endif /* SO_REUSE */
|
---|
470 | {
|
---|
471 | if (ip_addr_isany(&(cpcb->local_ip)) ||
|
---|
472 | ip_addr_isany(ipaddr) ||
|
---|
473 | ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
|
---|
474 | return ERR_USE;
|
---|
475 | }
|
---|
476 | }
|
---|
477 | }
|
---|
478 | }
|
---|
479 | }
|
---|
480 |
|
---|
481 | if (!ip_addr_isany(ipaddr)) {
|
---|
482 | pcb->local_ip = *ipaddr;
|
---|
483 | }
|
---|
484 | pcb->local_port = port;
|
---|
485 | TCP_REG(&tcp_bound_pcbs, pcb);
|
---|
486 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
|
---|
487 | return ERR_OK;
|
---|
488 | }
|
---|
489 | #if LWIP_CALLBACK_API
|
---|
490 | /**
|
---|
491 | * Default accept callback if no accept callback is specified by the user.
|
---|
492 | */
|
---|
493 | static err_t
|
---|
494 | tcp_accept_null(void *arg, struct tcp_pcb *pcb, err_t err)
|
---|
495 | {
|
---|
496 | LWIP_UNUSED_ARG(arg);
|
---|
497 | LWIP_UNUSED_ARG(pcb);
|
---|
498 | LWIP_UNUSED_ARG(err);
|
---|
499 |
|
---|
500 | return ERR_ABRT;
|
---|
501 | }
|
---|
502 | #endif /* LWIP_CALLBACK_API */
|
---|
503 |
|
---|
504 | /**
|
---|
505 | * Set the state of the connection to be LISTEN, which means that it
|
---|
506 | * is able to accept incoming connections. The protocol control block
|
---|
507 | * is reallocated in order to consume less memory. Setting the
|
---|
508 | * connection to LISTEN is an irreversible process.
|
---|
509 | *
|
---|
510 | * @param pcb the original tcp_pcb
|
---|
511 | * @param backlog the incoming connections queue limit
|
---|
512 | * @return tcp_pcb used for listening, consumes less memory.
|
---|
513 | *
|
---|
514 | * @note The original tcp_pcb is freed. This function therefore has to be
|
---|
515 | * called like this:
|
---|
516 | * tpcb = tcp_listen(tpcb);
|
---|
517 | */
|
---|
518 | struct tcp_pcb *
|
---|
519 | tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
|
---|
520 | {
|
---|
521 | struct tcp_pcb_listen *lpcb;
|
---|
522 |
|
---|
523 | LWIP_UNUSED_ARG(backlog);
|
---|
524 | LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL);
|
---|
525 |
|
---|
526 | /* already listening? */
|
---|
527 | if (pcb->state == LISTEN) {
|
---|
528 | return pcb;
|
---|
529 | }
|
---|
530 | #if SO_REUSE
|
---|
531 | if (ip_get_option(pcb, SOF_REUSEADDR)) {
|
---|
532 | /* Since SOF_REUSEADDR allows reusing a local address before the pcb's usage
|
---|
533 | is declared (listen-/connection-pcb), we have to make sure now that
|
---|
534 | this port is only used once for every local IP. */
|
---|
535 | for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
|
---|
536 | if (lpcb->local_port == pcb->local_port) {
|
---|
537 | if (ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
|
---|
538 | /* this address/port is already used */
|
---|
539 | return NULL;
|
---|
540 | }
|
---|
541 | }
|
---|
542 | }
|
---|
543 | }
|
---|
544 | #endif /* SO_REUSE */
|
---|
545 | lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
|
---|
546 | if (lpcb == NULL) {
|
---|
547 | return NULL;
|
---|
548 | }
|
---|
549 | lpcb->callback_arg = pcb->callback_arg;
|
---|
550 | lpcb->local_port = pcb->local_port;
|
---|
551 | lpcb->state = LISTEN;
|
---|
552 | lpcb->prio = pcb->prio;
|
---|
553 | lpcb->so_options = pcb->so_options;
|
---|
554 | ip_set_option(lpcb, SOF_ACCEPTCONN);
|
---|
555 | lpcb->ttl = pcb->ttl;
|
---|
556 | lpcb->tos = pcb->tos;
|
---|
557 | ip_addr_copy(lpcb->local_ip, pcb->local_ip);
|
---|
558 | if (pcb->local_port != 0) {
|
---|
559 | TCP_RMV(&tcp_bound_pcbs, pcb);
|
---|
560 | }
|
---|
561 | memp_free(MEMP_TCP_PCB, pcb);
|
---|
562 | #if LWIP_CALLBACK_API
|
---|
563 | lpcb->accept = tcp_accept_null;
|
---|
564 | #endif /* LWIP_CALLBACK_API */
|
---|
565 | #if TCP_LISTEN_BACKLOG
|
---|
566 | lpcb->accepts_pending = 0;
|
---|
567 | lpcb->backlog = (backlog ? backlog : 1);
|
---|
568 | #endif /* TCP_LISTEN_BACKLOG */
|
---|
569 | TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
|
---|
570 | return (struct tcp_pcb *)lpcb;
|
---|
571 | }
|
---|
572 |
|
---|
573 | /**
|
---|
574 | * Update the state that tracks the available window space to advertise.
|
---|
575 | *
|
---|
576 | * Returns how much extra window would be advertised if we sent an
|
---|
577 | * update now.
|
---|
578 | */
|
---|
579 | u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
|
---|
580 | {
|
---|
581 | u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
|
---|
582 |
|
---|
583 | if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) {
|
---|
584 | /* we can advertise more window */
|
---|
585 | pcb->rcv_ann_wnd = pcb->rcv_wnd;
|
---|
586 | return new_right_edge - pcb->rcv_ann_right_edge;
|
---|
587 | } else {
|
---|
588 | if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
|
---|
589 | /* Can happen due to other end sending out of advertised window,
|
---|
590 | * but within actual available (but not yet advertised) window */
|
---|
591 | pcb->rcv_ann_wnd = 0;
|
---|
592 | } else {
|
---|
593 | /* keep the right edge of window constant */
|
---|
594 | u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
|
---|
595 | LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff", new_rcv_ann_wnd <= 0xffff);
|
---|
596 | pcb->rcv_ann_wnd = (u16_t)new_rcv_ann_wnd;
|
---|
597 | }
|
---|
598 | return 0;
|
---|
599 | }
|
---|
600 | }
|
---|
601 |
|
---|
602 | /**
|
---|
603 | * This function should be called by the application when it has
|
---|
604 | * processed the data. The purpose is to advertise a larger window
|
---|
605 | * when the data has been processed.
|
---|
606 | *
|
---|
607 | * @param pcb the tcp_pcb for which data is read
|
---|
608 | * @param len the amount of bytes that have been read by the application
|
---|
609 | */
|
---|
610 | void
|
---|
611 | tcp_recved(struct tcp_pcb *pcb, u16_t len)
|
---|
612 | {
|
---|
613 | int wnd_inflation;
|
---|
614 |
|
---|
615 | /* pcb->state LISTEN not allowed here */
|
---|
616 | LWIP_ASSERT("don't call tcp_recved for listen-pcbs",
|
---|
617 | pcb->state != LISTEN);
|
---|
618 | LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
|
---|
619 | len <= 0xffff - pcb->rcv_wnd );
|
---|
620 |
|
---|
621 | pcb->rcv_wnd += len;
|
---|
622 | if (pcb->rcv_wnd > TCP_WND) {
|
---|
623 | pcb->rcv_wnd = TCP_WND;
|
---|
624 | }
|
---|
625 |
|
---|
626 | wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
|
---|
627 |
|
---|
628 | /* If the change in the right edge of window is significant (default
|
---|
629 | * watermark is TCP_WND/4), then send an explicit update now.
|
---|
630 | * Otherwise wait for a packet to be sent in the normal course of
|
---|
631 | * events (or more window to be available later) */
|
---|
632 | if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
|
---|
633 | tcp_ack_now(pcb);
|
---|
634 | tcp_output(pcb);
|
---|
635 | }
|
---|
636 |
|
---|
637 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
|
---|
638 | len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
|
---|
639 | }
|
---|
640 |
|
---|
641 | /**
|
---|
642 | * Allocate a new local TCP port.
|
---|
643 | *
|
---|
644 | * @return a new (free) local TCP port number
|
---|
645 | */
|
---|
646 | static u16_t
|
---|
647 | tcp_new_port(void)
|
---|
648 | {
|
---|
649 | u8_t i;
|
---|
650 | u16_t n = 0;
|
---|
651 | struct tcp_pcb *pcb;
|
---|
652 |
|
---|
653 | again:
|
---|
654 | if (tcp_port++ == TCP_LOCAL_PORT_RANGE_END) {
|
---|
655 | tcp_port = TCP_LOCAL_PORT_RANGE_START;
|
---|
656 | }
|
---|
657 | /* Check all PCB lists. */
|
---|
658 | for (i = 0; i < NUM_TCP_PCB_LISTS; i++) {
|
---|
659 | for(pcb = *tcp_pcb_lists[i]; pcb != NULL; pcb = pcb->next) {
|
---|
660 | if (pcb->local_port == tcp_port) {
|
---|
661 | if (++n > (TCP_LOCAL_PORT_RANGE_END - TCP_LOCAL_PORT_RANGE_START)) {
|
---|
662 | return 0;
|
---|
663 | }
|
---|
664 | goto again;
|
---|
665 | }
|
---|
666 | }
|
---|
667 | }
|
---|
668 | return tcp_port;
|
---|
669 | }
|
---|
670 |
|
---|
671 | /**
|
---|
672 | * Connects to another host. The function given as the "connected"
|
---|
673 | * argument will be called when the connection has been established.
|
---|
674 | *
|
---|
675 | * @param pcb the tcp_pcb used to establish the connection
|
---|
676 | * @param ipaddr the remote ip address to connect to
|
---|
677 | * @param port the remote tcp port to connect to
|
---|
678 | * @param connected callback function to call when connected (or on error)
|
---|
679 | * @return ERR_VAL if invalid arguments are given
|
---|
680 | * ERR_OK if connect request has been sent
|
---|
681 | * other err_t values if connect request couldn't be sent
|
---|
682 | */
|
---|
683 | err_t
|
---|
684 | tcp_connect(struct tcp_pcb *pcb, ip_addr_t *ipaddr, u16_t port,
|
---|
685 | tcp_connected_fn connected)
|
---|
686 | {
|
---|
687 | err_t ret;
|
---|
688 | u32_t iss;
|
---|
689 | u16_t old_local_port;
|
---|
690 |
|
---|
691 | LWIP_ERROR("tcp_connect: can only connect from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
|
---|
692 |
|
---|
693 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
|
---|
694 | if (ipaddr != NULL) {
|
---|
695 | pcb->remote_ip = *ipaddr;
|
---|
696 | } else {
|
---|
697 | return ERR_VAL;
|
---|
698 | }
|
---|
699 | pcb->remote_port = port;
|
---|
700 |
|
---|
701 | /* check if we have a route to the remote host */
|
---|
702 | if (ip_addr_isany(&(pcb->local_ip))) {
|
---|
703 | /* no local IP address set, yet. */
|
---|
704 | struct netif *netif = ip_route(&(pcb->remote_ip));
|
---|
705 | if (netif == NULL) {
|
---|
706 | /* Don't even try to send a SYN packet if we have no route
|
---|
707 | since that will fail. */
|
---|
708 | return ERR_RTE;
|
---|
709 | }
|
---|
710 | /* Use the netif's IP address as local address. */
|
---|
711 | ip_addr_copy(pcb->local_ip, netif->ip_addr);
|
---|
712 | }
|
---|
713 |
|
---|
714 | old_local_port = pcb->local_port;
|
---|
715 | if (pcb->local_port == 0) {
|
---|
716 | pcb->local_port = tcp_new_port();
|
---|
717 | if (pcb->local_port == 0) {
|
---|
718 | return ERR_BUF;
|
---|
719 | }
|
---|
720 | }
|
---|
721 | #if SO_REUSE
|
---|
722 | if (ip_get_option(pcb, SOF_REUSEADDR)) {
|
---|
723 | /* Since SOF_REUSEADDR allows reusing a local address, we have to make sure
|
---|
724 | now that the 5-tuple is unique. */
|
---|
725 | struct tcp_pcb *cpcb;
|
---|
726 | int i;
|
---|
727 | /* Don't check listen- and bound-PCBs, check active- and TIME-WAIT PCBs. */
|
---|
728 | for (i = 2; i < NUM_TCP_PCB_LISTS; i++) {
|
---|
729 | for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
|
---|
730 | if ((cpcb->local_port == pcb->local_port) &&
|
---|
731 | (cpcb->remote_port == port) &&
|
---|
732 | ip_addr_cmp(&cpcb->local_ip, &pcb->local_ip) &&
|
---|
733 | ip_addr_cmp(&cpcb->remote_ip, ipaddr)) {
|
---|
734 | /* linux returns EISCONN here, but ERR_USE should be OK for us */
|
---|
735 | return ERR_USE;
|
---|
736 | }
|
---|
737 | }
|
---|
738 | }
|
---|
739 | }
|
---|
740 | #endif /* SO_REUSE */
|
---|
741 | iss = tcp_next_iss();
|
---|
742 | pcb->rcv_nxt = 0;
|
---|
743 | pcb->snd_nxt = iss;
|
---|
744 | pcb->lastack = iss - 1;
|
---|
745 | pcb->snd_lbb = iss - 1;
|
---|
746 | pcb->rcv_wnd = TCP_WND;
|
---|
747 | pcb->rcv_ann_wnd = TCP_WND;
|
---|
748 | pcb->rcv_ann_right_edge = pcb->rcv_nxt;
|
---|
749 | pcb->snd_wnd = TCP_WND;
|
---|
750 | /* As initial send MSS, we use TCP_MSS but limit it to 536.
|
---|
751 | The send MSS is updated when an MSS option is received. */
|
---|
752 | pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
|
---|
753 | #if TCP_CALCULATE_EFF_SEND_MSS
|
---|
754 | pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr);
|
---|
755 | #endif /* TCP_CALCULATE_EFF_SEND_MSS */
|
---|
756 | pcb->cwnd = 1;
|
---|
757 | pcb->ssthresh = pcb->mss * 10;
|
---|
758 | #if LWIP_CALLBACK_API
|
---|
759 | pcb->connected = connected;
|
---|
760 | #else /* LWIP_CALLBACK_API */
|
---|
761 | LWIP_UNUSED_ARG(connected);
|
---|
762 | #endif /* LWIP_CALLBACK_API */
|
---|
763 |
|
---|
764 | /* Send a SYN together with the MSS option. */
|
---|
765 | ret = tcp_enqueue_flags(pcb, TCP_SYN);
|
---|
766 | if (ret == ERR_OK) {
|
---|
767 | /* SYN segment was enqueued, changed the pcbs state now */
|
---|
768 | pcb->state = SYN_SENT;
|
---|
769 | if (old_local_port != 0) {
|
---|
770 | TCP_RMV(&tcp_bound_pcbs, pcb);
|
---|
771 | }
|
---|
772 | TCP_REG_ACTIVE(pcb);
|
---|
773 | snmp_inc_tcpactiveopens();
|
---|
774 |
|
---|
775 | tcp_output(pcb);
|
---|
776 | }
|
---|
777 | return ret;
|
---|
778 | }
|
---|
779 |
|
---|
780 | /**
|
---|
781 | * Called every 500 ms and implements the retransmission timer and the timer that
|
---|
782 | * removes PCBs that have been in TIME-WAIT for enough time. It also increments
|
---|
783 | * various timers such as the inactivity timer in each PCB.
|
---|
784 | *
|
---|
785 | * Automatically called from tcp_tmr().
|
---|
786 | */
|
---|
787 | void
|
---|
788 | tcp_slowtmr(void)
|
---|
789 | {
|
---|
790 | struct tcp_pcb *pcb, *prev;
|
---|
791 | u16_t eff_wnd;
|
---|
792 | u8_t pcb_remove; /* flag if a PCB should be removed */
|
---|
793 | u8_t pcb_reset; /* flag if a RST should be sent when removing */
|
---|
794 | err_t err;
|
---|
795 |
|
---|
796 | err = ERR_OK;
|
---|
797 |
|
---|
798 | ++tcp_ticks;
|
---|
799 | ++tcp_timer_ctr;
|
---|
800 |
|
---|
801 | tcp_slowtmr_start:
|
---|
802 | /* Steps through all of the active PCBs. */
|
---|
803 | prev = NULL;
|
---|
804 | pcb = tcp_active_pcbs;
|
---|
805 | if (pcb == NULL) {
|
---|
806 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
|
---|
807 | }
|
---|
808 | while (pcb != NULL) {
|
---|
809 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
|
---|
810 | LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
|
---|
811 | LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
|
---|
812 | LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
|
---|
813 | if (pcb->last_timer == tcp_timer_ctr) {
|
---|
814 | /* skip this pcb, we have already processed it */
|
---|
815 | pcb = pcb->next;
|
---|
816 | continue;
|
---|
817 | }
|
---|
818 | pcb->last_timer = tcp_timer_ctr;
|
---|
819 |
|
---|
820 | pcb_remove = 0;
|
---|
821 | pcb_reset = 0;
|
---|
822 |
|
---|
823 | if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
|
---|
824 | ++pcb_remove;
|
---|
825 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
|
---|
826 | }
|
---|
827 | else if (pcb->nrtx == TCP_MAXRTX) {
|
---|
828 | ++pcb_remove;
|
---|
829 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
|
---|
830 | } else {
|
---|
831 | if (pcb->persist_backoff > 0) {
|
---|
832 | /* If snd_wnd is zero, use persist timer to send 1 byte probes
|
---|
833 | * instead of using the standard retransmission mechanism. */
|
---|
834 | pcb->persist_cnt++;
|
---|
835 | if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) {
|
---|
836 | pcb->persist_cnt = 0;
|
---|
837 | if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
|
---|
838 | pcb->persist_backoff++;
|
---|
839 | }
|
---|
840 | tcp_zero_window_probe(pcb);
|
---|
841 | }
|
---|
842 | } else {
|
---|
843 | /* Increase the retransmission timer if it is running */
|
---|
844 | if(pcb->rtime >= 0) {
|
---|
845 | ++pcb->rtime;
|
---|
846 | }
|
---|
847 |
|
---|
848 | if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
|
---|
849 | /* Time for a retransmission. */
|
---|
850 | LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
|
---|
851 | " pcb->rto %"S16_F"\n",
|
---|
852 | pcb->rtime, pcb->rto));
|
---|
853 |
|
---|
854 | /* Double retransmission time-out unless we are trying to
|
---|
855 | * connect to somebody (i.e., we are in SYN_SENT). */
|
---|
856 | if (pcb->state != SYN_SENT) {
|
---|
857 | pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
|
---|
858 | }
|
---|
859 |
|
---|
860 | /* Reset the retransmission timer. */
|
---|
861 | pcb->rtime = 0;
|
---|
862 |
|
---|
863 | /* Reduce congestion window and ssthresh. */
|
---|
864 | eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
|
---|
865 | pcb->ssthresh = eff_wnd >> 1;
|
---|
866 | if (pcb->ssthresh < (pcb->mss << 1)) {
|
---|
867 | pcb->ssthresh = (pcb->mss << 1);
|
---|
868 | }
|
---|
869 | pcb->cwnd = pcb->mss;
|
---|
870 | LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F
|
---|
871 | " ssthresh %"U16_F"\n",
|
---|
872 | pcb->cwnd, pcb->ssthresh));
|
---|
873 |
|
---|
874 | /* The following needs to be called AFTER cwnd is set to one
|
---|
875 | mss - STJ */
|
---|
876 | tcp_rexmit_rto(pcb);
|
---|
877 | }
|
---|
878 | }
|
---|
879 | }
|
---|
880 | /* Check if this PCB has stayed too long in FIN-WAIT-2 */
|
---|
881 | if (pcb->state == FIN_WAIT_2) {
|
---|
882 | /* If this PCB is in FIN_WAIT_2 because of SHUT_WR don't let it time out. */
|
---|
883 | if (pcb->flags & TF_RXCLOSED) {
|
---|
884 | /* PCB was fully closed (either through close() or SHUT_RDWR):
|
---|
885 | normal FIN-WAIT timeout handling. */
|
---|
886 | if ((u32_t)(tcp_ticks - pcb->tmr) >
|
---|
887 | TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
|
---|
888 | ++pcb_remove;
|
---|
889 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
|
---|
890 | }
|
---|
891 | }
|
---|
892 | }
|
---|
893 |
|
---|
894 | /* Check if KEEPALIVE should be sent */
|
---|
895 | if(ip_get_option(pcb, SOF_KEEPALIVE) &&
|
---|
896 | ((pcb->state == ESTABLISHED) ||
|
---|
897 | (pcb->state == CLOSE_WAIT))) {
|
---|
898 | if((u32_t)(tcp_ticks - pcb->tmr) >
|
---|
899 | (pcb->keep_idle + TCP_KEEP_DUR(pcb)) / TCP_SLOW_INTERVAL)
|
---|
900 | {
|
---|
901 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n",
|
---|
902 | ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
|
---|
903 | ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
|
---|
904 |
|
---|
905 | ++pcb_remove;
|
---|
906 | ++pcb_reset;
|
---|
907 | }
|
---|
908 | else if((u32_t)(tcp_ticks - pcb->tmr) >
|
---|
909 | (pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEP_INTVL(pcb))
|
---|
910 | / TCP_SLOW_INTERVAL)
|
---|
911 | {
|
---|
912 | tcp_keepalive(pcb);
|
---|
913 | pcb->keep_cnt_sent++;
|
---|
914 | }
|
---|
915 | }
|
---|
916 |
|
---|
917 | /* If this PCB has queued out of sequence data, but has been
|
---|
918 | inactive for too long, will drop the data (it will eventually
|
---|
919 | be retransmitted). */
|
---|
920 | #if TCP_QUEUE_OOSEQ
|
---|
921 | if (pcb->ooseq != NULL &&
|
---|
922 | (u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) {
|
---|
923 | tcp_segs_free(pcb->ooseq);
|
---|
924 | pcb->ooseq = NULL;
|
---|
925 | LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
|
---|
926 | }
|
---|
927 | #endif /* TCP_QUEUE_OOSEQ */
|
---|
928 |
|
---|
929 | /* Check if this PCB has stayed too long in SYN-RCVD */
|
---|
930 | if (pcb->state == SYN_RCVD) {
|
---|
931 | if ((u32_t)(tcp_ticks - pcb->tmr) >
|
---|
932 | TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
|
---|
933 | ++pcb_remove;
|
---|
934 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
|
---|
935 | }
|
---|
936 | }
|
---|
937 |
|
---|
938 | /* Check if this PCB has stayed too long in LAST-ACK */
|
---|
939 | if (pcb->state == LAST_ACK) {
|
---|
940 | if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
|
---|
941 | ++pcb_remove;
|
---|
942 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
|
---|
943 | }
|
---|
944 | }
|
---|
945 |
|
---|
946 | /* If the PCB should be removed, do it. */
|
---|
947 | if (pcb_remove) {
|
---|
948 | struct tcp_pcb *pcb2;
|
---|
949 | tcp_err_fn err_fn;
|
---|
950 | void *err_arg;
|
---|
951 | tcp_pcb_purge(pcb);
|
---|
952 | /* Remove PCB from tcp_active_pcbs list. */
|
---|
953 | if (prev != NULL) {
|
---|
954 | LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
|
---|
955 | prev->next = pcb->next;
|
---|
956 | } else {
|
---|
957 | /* This PCB was the first. */
|
---|
958 | LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
|
---|
959 | tcp_active_pcbs = pcb->next;
|
---|
960 | }
|
---|
961 |
|
---|
962 | if (pcb_reset) {
|
---|
963 | tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
|
---|
964 | pcb->local_port, pcb->remote_port);
|
---|
965 | }
|
---|
966 |
|
---|
967 | err_fn = pcb->errf;
|
---|
968 | err_arg = pcb->callback_arg;
|
---|
969 | pcb2 = pcb;
|
---|
970 | pcb = pcb->next;
|
---|
971 | memp_free(MEMP_TCP_PCB, pcb2);
|
---|
972 |
|
---|
973 | tcp_active_pcbs_changed = 0;
|
---|
974 | TCP_EVENT_ERR(err_fn, err_arg, ERR_ABRT);
|
---|
975 | if (tcp_active_pcbs_changed) {
|
---|
976 | goto tcp_slowtmr_start;
|
---|
977 | }
|
---|
978 | } else {
|
---|
979 | /* get the 'next' element now and work with 'prev' below (in case of abort) */
|
---|
980 | prev = pcb;
|
---|
981 | pcb = pcb->next;
|
---|
982 |
|
---|
983 | /* We check if we should poll the connection. */
|
---|
984 | ++prev->polltmr;
|
---|
985 | if (prev->polltmr >= prev->pollinterval) {
|
---|
986 | prev->polltmr = 0;
|
---|
987 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
|
---|
988 | tcp_active_pcbs_changed = 0;
|
---|
989 | TCP_EVENT_POLL(prev, err);
|
---|
990 | if (tcp_active_pcbs_changed) {
|
---|
991 | goto tcp_slowtmr_start;
|
---|
992 | }
|
---|
993 | /* if err == ERR_ABRT, 'prev' is already deallocated */
|
---|
994 | if (err == ERR_OK) {
|
---|
995 | tcp_output(prev);
|
---|
996 | }
|
---|
997 | }
|
---|
998 | }
|
---|
999 | }
|
---|
1000 |
|
---|
1001 |
|
---|
1002 | /* Steps through all of the TIME-WAIT PCBs. */
|
---|
1003 | prev = NULL;
|
---|
1004 | pcb = tcp_tw_pcbs;
|
---|
1005 | while (pcb != NULL) {
|
---|
1006 | LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
|
---|
1007 | pcb_remove = 0;
|
---|
1008 |
|
---|
1009 | /* Check if this PCB has stayed long enough in TIME-WAIT */
|
---|
1010 | if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
|
---|
1011 | ++pcb_remove;
|
---|
1012 | }
|
---|
1013 |
|
---|
1014 |
|
---|
1015 |
|
---|
1016 | /* If the PCB should be removed, do it. */
|
---|
1017 | if (pcb_remove) {
|
---|
1018 | struct tcp_pcb *pcb2;
|
---|
1019 | tcp_pcb_purge(pcb);
|
---|
1020 | /* Remove PCB from tcp_tw_pcbs list. */
|
---|
1021 | if (prev != NULL) {
|
---|
1022 | LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
|
---|
1023 | prev->next = pcb->next;
|
---|
1024 | } else {
|
---|
1025 | /* This PCB was the first. */
|
---|
1026 | LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
|
---|
1027 | tcp_tw_pcbs = pcb->next;
|
---|
1028 | }
|
---|
1029 | pcb2 = pcb;
|
---|
1030 | pcb = pcb->next;
|
---|
1031 | memp_free(MEMP_TCP_PCB, pcb2);
|
---|
1032 | } else {
|
---|
1033 | prev = pcb;
|
---|
1034 | pcb = pcb->next;
|
---|
1035 | }
|
---|
1036 | }
|
---|
1037 | }
|
---|
1038 |
|
---|
1039 | /**
|
---|
1040 | * Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
|
---|
1041 | * "refused" by upper layer (application) and sends delayed ACKs.
|
---|
1042 | *
|
---|
1043 | * Automatically called from tcp_tmr().
|
---|
1044 | */
|
---|
1045 | void
|
---|
1046 | tcp_fasttmr(void)
|
---|
1047 | {
|
---|
1048 | struct tcp_pcb *pcb;
|
---|
1049 |
|
---|
1050 | ++tcp_timer_ctr;
|
---|
1051 |
|
---|
1052 | tcp_fasttmr_start:
|
---|
1053 | pcb = tcp_active_pcbs;
|
---|
1054 |
|
---|
1055 | while(pcb != NULL) {
|
---|
1056 | if (pcb->last_timer != tcp_timer_ctr) {
|
---|
1057 | struct tcp_pcb *next;
|
---|
1058 | pcb->last_timer = tcp_timer_ctr;
|
---|
1059 | /* send delayed ACKs */
|
---|
1060 | if (pcb->flags & TF_ACK_DELAY) {
|
---|
1061 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
|
---|
1062 | tcp_ack_now(pcb);
|
---|
1063 | tcp_output(pcb);
|
---|
1064 | pcb->flags &= ~(TF_ACK_DELAY | TF_ACK_NOW);
|
---|
1065 | }
|
---|
1066 |
|
---|
1067 | next = pcb->next;
|
---|
1068 |
|
---|
1069 | /* If there is data which was previously "refused" by upper layer */
|
---|
1070 | if (pcb->refused_data != NULL) {
|
---|
1071 | tcp_active_pcbs_changed = 0;
|
---|
1072 | tcp_process_refused_data(pcb);
|
---|
1073 | if (tcp_active_pcbs_changed) {
|
---|
1074 | /* application callback has changed the pcb list: restart the loop */
|
---|
1075 | goto tcp_fasttmr_start;
|
---|
1076 | }
|
---|
1077 | }
|
---|
1078 | pcb = next;
|
---|
1079 | }
|
---|
1080 | }
|
---|
1081 | }
|
---|
1082 |
|
---|
1083 | /** Pass pcb->refused_data to the recv callback */
|
---|
1084 | err_t
|
---|
1085 | tcp_process_refused_data(struct tcp_pcb *pcb)
|
---|
1086 | {
|
---|
1087 | err_t err;
|
---|
1088 | u8_t refused_flags = pcb->refused_data->flags;
|
---|
1089 | /* set pcb->refused_data to NULL in case the callback frees it and then
|
---|
1090 | closes the pcb */
|
---|
1091 | struct pbuf *refused_data = pcb->refused_data;
|
---|
1092 | pcb->refused_data = NULL;
|
---|
1093 | /* Notify again application with data previously received. */
|
---|
1094 | LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: notify kept packet\n"));
|
---|
1095 | TCP_EVENT_RECV(pcb, refused_data, ERR_OK, err);
|
---|
1096 | if (err == ERR_OK) {
|
---|
1097 | /* did refused_data include a FIN? */
|
---|
1098 | if (refused_flags & PBUF_FLAG_TCP_FIN) {
|
---|
1099 | /* correct rcv_wnd as the application won't call tcp_recved()
|
---|
1100 | for the FIN's seqno */
|
---|
1101 | if (pcb->rcv_wnd != TCP_WND) {
|
---|
1102 | pcb->rcv_wnd++;
|
---|
1103 | }
|
---|
1104 | TCP_EVENT_CLOSED(pcb, err);
|
---|
1105 | if (err == ERR_ABRT) {
|
---|
1106 | return ERR_ABRT;
|
---|
1107 | }
|
---|
1108 | }
|
---|
1109 | } else if (err == ERR_ABRT) {
|
---|
1110 | /* if err == ERR_ABRT, 'pcb' is already deallocated */
|
---|
1111 | /* Drop incoming packets because pcb is "full" (only if the incoming
|
---|
1112 | segment contains data). */
|
---|
1113 | LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: drop incoming packets, because pcb is \"full\"\n"));
|
---|
1114 | return ERR_ABRT;
|
---|
1115 | } else {
|
---|
1116 | /* data is still refused, pbuf is still valid (go on for ACK-only packets) */
|
---|
1117 | pcb->refused_data = refused_data;
|
---|
1118 | }
|
---|
1119 | return ERR_OK;
|
---|
1120 | }
|
---|
1121 |
|
---|
1122 | /**
|
---|
1123 | * Deallocates a list of TCP segments (tcp_seg structures).
|
---|
1124 | *
|
---|
1125 | * @param seg tcp_seg list of TCP segments to free
|
---|
1126 | */
|
---|
1127 | void
|
---|
1128 | tcp_segs_free(struct tcp_seg *seg)
|
---|
1129 | {
|
---|
1130 | while (seg != NULL) {
|
---|
1131 | struct tcp_seg *next = seg->next;
|
---|
1132 | tcp_seg_free(seg);
|
---|
1133 | seg = next;
|
---|
1134 | }
|
---|
1135 | }
|
---|
1136 |
|
---|
1137 | /**
|
---|
1138 | * Frees a TCP segment (tcp_seg structure).
|
---|
1139 | *
|
---|
1140 | * @param seg single tcp_seg to free
|
---|
1141 | */
|
---|
1142 | void
|
---|
1143 | tcp_seg_free(struct tcp_seg *seg)
|
---|
1144 | {
|
---|
1145 | if (seg != NULL) {
|
---|
1146 | if (seg->p != NULL) {
|
---|
1147 | pbuf_free(seg->p);
|
---|
1148 | #if TCP_DEBUG
|
---|
1149 | seg->p = NULL;
|
---|
1150 | #endif /* TCP_DEBUG */
|
---|
1151 | }
|
---|
1152 | memp_free(MEMP_TCP_SEG, seg);
|
---|
1153 | }
|
---|
1154 | }
|
---|
1155 |
|
---|
1156 | /**
|
---|
1157 | * Sets the priority of a connection.
|
---|
1158 | *
|
---|
1159 | * @param pcb the tcp_pcb to manipulate
|
---|
1160 | * @param prio new priority
|
---|
1161 | */
|
---|
1162 | void
|
---|
1163 | tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
|
---|
1164 | {
|
---|
1165 | pcb->prio = prio;
|
---|
1166 | }
|
---|
1167 |
|
---|
1168 | #if TCP_QUEUE_OOSEQ
|
---|
1169 | /**
|
---|
1170 | * Returns a copy of the given TCP segment.
|
---|
1171 | * The pbuf and data are not copied, only the pointers
|
---|
1172 | *
|
---|
1173 | * @param seg the old tcp_seg
|
---|
1174 | * @return a copy of seg
|
---|
1175 | */
|
---|
1176 | struct tcp_seg *
|
---|
1177 | tcp_seg_copy(struct tcp_seg *seg)
|
---|
1178 | {
|
---|
1179 | struct tcp_seg *cseg;
|
---|
1180 |
|
---|
1181 | cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG);
|
---|
1182 | if (cseg == NULL) {
|
---|
1183 | return NULL;
|
---|
1184 | }
|
---|
1185 | SMEMCPY((u8_t *)cseg, (const u8_t *)seg, sizeof(struct tcp_seg));
|
---|
1186 | pbuf_ref(cseg->p);
|
---|
1187 | return cseg;
|
---|
1188 | }
|
---|
1189 | #endif /* TCP_QUEUE_OOSEQ */
|
---|
1190 |
|
---|
1191 | #if LWIP_CALLBACK_API
|
---|
1192 | /**
|
---|
1193 | * Default receive callback that is called if the user didn't register
|
---|
1194 | * a recv callback for the pcb.
|
---|
1195 | */
|
---|
1196 | err_t
|
---|
1197 | tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
|
---|
1198 | {
|
---|
1199 | LWIP_UNUSED_ARG(arg);
|
---|
1200 | if (p != NULL) {
|
---|
1201 | tcp_recved(pcb, p->tot_len);
|
---|
1202 | pbuf_free(p);
|
---|
1203 | } else if (err == ERR_OK) {
|
---|
1204 | return tcp_close(pcb);
|
---|
1205 | }
|
---|
1206 | return ERR_OK;
|
---|
1207 | }
|
---|
1208 | #endif /* LWIP_CALLBACK_API */
|
---|
1209 |
|
---|
1210 | /**
|
---|
1211 | * Kills the oldest active connection that has the same or lower priority than
|
---|
1212 | * 'prio'.
|
---|
1213 | *
|
---|
1214 | * @param prio minimum priority
|
---|
1215 | */
|
---|
1216 | static void
|
---|
1217 | tcp_kill_prio(u8_t prio)
|
---|
1218 | {
|
---|
1219 | struct tcp_pcb *pcb, *inactive;
|
---|
1220 | u32_t inactivity;
|
---|
1221 | u8_t mprio;
|
---|
1222 |
|
---|
1223 |
|
---|
1224 | mprio = TCP_PRIO_MAX;
|
---|
1225 |
|
---|
1226 | /* We kill the oldest active connection that has lower priority than prio. */
|
---|
1227 | inactivity = 0;
|
---|
1228 | inactive = NULL;
|
---|
1229 | for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
|
---|
1230 | if (pcb->prio <= prio &&
|
---|
1231 | pcb->prio <= mprio &&
|
---|
1232 | (u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
|
---|
1233 | inactivity = tcp_ticks - pcb->tmr;
|
---|
1234 | inactive = pcb;
|
---|
1235 | mprio = pcb->prio;
|
---|
1236 | }
|
---|
1237 | }
|
---|
1238 | if (inactive != NULL) {
|
---|
1239 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n",
|
---|
1240 | (void *)inactive, inactivity));
|
---|
1241 | tcp_abort(inactive);
|
---|
1242 | }
|
---|
1243 | }
|
---|
1244 |
|
---|
1245 | /**
|
---|
1246 | * Kills the oldest connection that is in TIME_WAIT state.
|
---|
1247 | * Called from tcp_alloc() if no more connections are available.
|
---|
1248 | */
|
---|
1249 | static void
|
---|
1250 | tcp_kill_timewait(void)
|
---|
1251 | {
|
---|
1252 | struct tcp_pcb *pcb, *inactive;
|
---|
1253 | u32_t inactivity;
|
---|
1254 |
|
---|
1255 | inactivity = 0;
|
---|
1256 | inactive = NULL;
|
---|
1257 | /* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
|
---|
1258 | for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
|
---|
1259 | if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
|
---|
1260 | inactivity = tcp_ticks - pcb->tmr;
|
---|
1261 | inactive = pcb;
|
---|
1262 | }
|
---|
1263 | }
|
---|
1264 | if (inactive != NULL) {
|
---|
1265 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n",
|
---|
1266 | (void *)inactive, inactivity));
|
---|
1267 | tcp_abort(inactive);
|
---|
1268 | }
|
---|
1269 | }
|
---|
1270 |
|
---|
1271 | /**
|
---|
1272 | * Allocate a new tcp_pcb structure.
|
---|
1273 | *
|
---|
1274 | * @param prio priority for the new pcb
|
---|
1275 | * @return a new tcp_pcb that initially is in state CLOSED
|
---|
1276 | */
|
---|
1277 | struct tcp_pcb *
|
---|
1278 | tcp_alloc(u8_t prio)
|
---|
1279 | {
|
---|
1280 | struct tcp_pcb *pcb;
|
---|
1281 | u32_t iss;
|
---|
1282 |
|
---|
1283 | pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
|
---|
1284 | if (pcb == NULL) {
|
---|
1285 | /* Try killing oldest connection in TIME-WAIT. */
|
---|
1286 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
|
---|
1287 | tcp_kill_timewait();
|
---|
1288 | /* Try to allocate a tcp_pcb again. */
|
---|
1289 | pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
|
---|
1290 | if (pcb == NULL) {
|
---|
1291 | /* Try killing active connections with lower priority than the new one. */
|
---|
1292 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing connection with prio lower than %d\n", prio));
|
---|
1293 | tcp_kill_prio(prio);
|
---|
1294 | /* Try to allocate a tcp_pcb again. */
|
---|
1295 | pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
|
---|
1296 | if (pcb != NULL) {
|
---|
1297 | /* adjust err stats: memp_malloc failed twice before */
|
---|
1298 | MEMP_STATS_DEC(err, MEMP_TCP_PCB);
|
---|
1299 | }
|
---|
1300 | }
|
---|
1301 | if (pcb != NULL) {
|
---|
1302 | /* adjust err stats: timewait PCB was freed above */
|
---|
1303 | MEMP_STATS_DEC(err, MEMP_TCP_PCB);
|
---|
1304 | }
|
---|
1305 | }
|
---|
1306 | if (pcb != NULL) {
|
---|
1307 | memset(pcb, 0, sizeof(struct tcp_pcb));
|
---|
1308 | pcb->prio = prio;
|
---|
1309 | pcb->snd_buf = TCP_SND_BUF;
|
---|
1310 | pcb->snd_queuelen = 0;
|
---|
1311 | pcb->rcv_wnd = TCP_WND;
|
---|
1312 | pcb->rcv_ann_wnd = TCP_WND;
|
---|
1313 | pcb->tos = 0;
|
---|
1314 | pcb->ttl = TCP_TTL;
|
---|
1315 | /* As initial send MSS, we use TCP_MSS but limit it to 536.
|
---|
1316 | The send MSS is updated when an MSS option is received. */
|
---|
1317 | pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
|
---|
1318 | pcb->rto = 3000 / TCP_SLOW_INTERVAL;
|
---|
1319 | pcb->sa = 0;
|
---|
1320 | pcb->sv = 3000 / TCP_SLOW_INTERVAL;
|
---|
1321 | pcb->rtime = -1;
|
---|
1322 | pcb->cwnd = 1;
|
---|
1323 | iss = tcp_next_iss();
|
---|
1324 | pcb->snd_wl2 = iss;
|
---|
1325 | pcb->snd_nxt = iss;
|
---|
1326 | pcb->lastack = iss;
|
---|
1327 | pcb->snd_lbb = iss;
|
---|
1328 | pcb->tmr = tcp_ticks;
|
---|
1329 | pcb->last_timer = tcp_timer_ctr;
|
---|
1330 |
|
---|
1331 | pcb->polltmr = 0;
|
---|
1332 |
|
---|
1333 | #if LWIP_CALLBACK_API
|
---|
1334 | pcb->recv = tcp_recv_null;
|
---|
1335 | #endif /* LWIP_CALLBACK_API */
|
---|
1336 |
|
---|
1337 | /* Init KEEPALIVE timer */
|
---|
1338 | pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
|
---|
1339 |
|
---|
1340 | #if LWIP_TCP_KEEPALIVE
|
---|
1341 | pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
|
---|
1342 | pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
|
---|
1343 | #endif /* LWIP_TCP_KEEPALIVE */
|
---|
1344 |
|
---|
1345 | pcb->keep_cnt_sent = 0;
|
---|
1346 | }
|
---|
1347 | return pcb;
|
---|
1348 | }
|
---|
1349 |
|
---|
1350 | /**
|
---|
1351 | * Creates a new TCP protocol control block but doesn't place it on
|
---|
1352 | * any of the TCP PCB lists.
|
---|
1353 | * The pcb is not put on any list until binding using tcp_bind().
|
---|
1354 | *
|
---|
1355 | * @internal: Maybe there should be a idle TCP PCB list where these
|
---|
1356 | * PCBs are put on. Port reservation using tcp_bind() is implemented but
|
---|
1357 | * allocated pcbs that are not bound can't be killed automatically if wanting
|
---|
1358 | * to allocate a pcb with higher prio (@see tcp_kill_prio())
|
---|
1359 | *
|
---|
1360 | * @return a new tcp_pcb that initially is in state CLOSED
|
---|
1361 | */
|
---|
1362 | struct tcp_pcb *
|
---|
1363 | tcp_new(void)
|
---|
1364 | {
|
---|
1365 | return tcp_alloc(TCP_PRIO_NORMAL);
|
---|
1366 | }
|
---|
1367 |
|
---|
1368 | /**
|
---|
1369 | * Used to specify the argument that should be passed callback
|
---|
1370 | * functions.
|
---|
1371 | *
|
---|
1372 | * @param pcb tcp_pcb to set the callback argument
|
---|
1373 | * @param arg void pointer argument to pass to callback functions
|
---|
1374 | */
|
---|
1375 | void
|
---|
1376 | tcp_arg(struct tcp_pcb *pcb, void *arg)
|
---|
1377 | {
|
---|
1378 | /* This function is allowed to be called for both listen pcbs and
|
---|
1379 | connection pcbs. */
|
---|
1380 | pcb->callback_arg = arg;
|
---|
1381 | }
|
---|
1382 | #if LWIP_CALLBACK_API
|
---|
1383 |
|
---|
1384 | /**
|
---|
1385 | * Used to specify the function that should be called when a TCP
|
---|
1386 | * connection receives data.
|
---|
1387 | *
|
---|
1388 | * @param pcb tcp_pcb to set the recv callback
|
---|
1389 | * @param recv callback function to call for this pcb when data is received
|
---|
1390 | */
|
---|
1391 | void
|
---|
1392 | tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
|
---|
1393 | {
|
---|
1394 | LWIP_ASSERT("invalid socket state for recv callback", pcb->state != LISTEN);
|
---|
1395 | pcb->recv = recv;
|
---|
1396 | }
|
---|
1397 |
|
---|
1398 | /**
|
---|
1399 | * Used to specify the function that should be called when TCP data
|
---|
1400 | * has been successfully delivered to the remote host.
|
---|
1401 | *
|
---|
1402 | * @param pcb tcp_pcb to set the sent callback
|
---|
1403 | * @param sent callback function to call for this pcb when data is successfully sent
|
---|
1404 | */
|
---|
1405 | void
|
---|
1406 | tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
|
---|
1407 | {
|
---|
1408 | LWIP_ASSERT("invalid socket state for sent callback", pcb->state != LISTEN);
|
---|
1409 | pcb->sent = sent;
|
---|
1410 | }
|
---|
1411 |
|
---|
1412 | /**
|
---|
1413 | * Used to specify the function that should be called when a fatal error
|
---|
1414 | * has occured on the connection.
|
---|
1415 | *
|
---|
1416 | * @param pcb tcp_pcb to set the err callback
|
---|
1417 | * @param err callback function to call for this pcb when a fatal error
|
---|
1418 | * has occured on the connection
|
---|
1419 | */
|
---|
1420 | void
|
---|
1421 | tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
|
---|
1422 | {
|
---|
1423 | LWIP_ASSERT("invalid socket state for err callback", pcb->state != LISTEN);
|
---|
1424 | pcb->errf = err;
|
---|
1425 | }
|
---|
1426 |
|
---|
1427 | /**
|
---|
1428 | * Used for specifying the function that should be called when a
|
---|
1429 | * LISTENing connection has been connected to another host.
|
---|
1430 | *
|
---|
1431 | * @param pcb tcp_pcb to set the accept callback
|
---|
1432 | * @param accept callback function to call for this pcb when LISTENing
|
---|
1433 | * connection has been connected to another host
|
---|
1434 | */
|
---|
1435 | void
|
---|
1436 | tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
|
---|
1437 | {
|
---|
1438 | /* This function is allowed to be called for both listen pcbs and
|
---|
1439 | connection pcbs. */
|
---|
1440 | pcb->accept = accept;
|
---|
1441 | }
|
---|
1442 | #endif /* LWIP_CALLBACK_API */
|
---|
1443 |
|
---|
1444 |
|
---|
1445 | /**
|
---|
1446 | * Used to specify the function that should be called periodically
|
---|
1447 | * from TCP. The interval is specified in terms of the TCP coarse
|
---|
1448 | * timer interval, which is called twice a second.
|
---|
1449 | *
|
---|
1450 | */
|
---|
1451 | void
|
---|
1452 | tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
|
---|
1453 | {
|
---|
1454 | LWIP_ASSERT("invalid socket state for poll", pcb->state != LISTEN);
|
---|
1455 | #if LWIP_CALLBACK_API
|
---|
1456 | pcb->poll = poll;
|
---|
1457 | #else /* LWIP_CALLBACK_API */
|
---|
1458 | LWIP_UNUSED_ARG(poll);
|
---|
1459 | #endif /* LWIP_CALLBACK_API */
|
---|
1460 | pcb->pollinterval = interval;
|
---|
1461 | }
|
---|
1462 |
|
---|
1463 | /**
|
---|
1464 | * Purges a TCP PCB. Removes any buffered data and frees the buffer memory
|
---|
1465 | * (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
|
---|
1466 | *
|
---|
1467 | * @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
|
---|
1468 | */
|
---|
1469 | void
|
---|
1470 | tcp_pcb_purge(struct tcp_pcb *pcb)
|
---|
1471 | {
|
---|
1472 | if (pcb->state != CLOSED &&
|
---|
1473 | pcb->state != TIME_WAIT &&
|
---|
1474 | pcb->state != LISTEN) {
|
---|
1475 |
|
---|
1476 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
|
---|
1477 |
|
---|
1478 | #if TCP_LISTEN_BACKLOG
|
---|
1479 | if (pcb->state == SYN_RCVD) {
|
---|
1480 | /* Need to find the corresponding listen_pcb and decrease its accepts_pending */
|
---|
1481 | struct tcp_pcb_listen *lpcb;
|
---|
1482 | LWIP_ASSERT("tcp_pcb_purge: pcb->state == SYN_RCVD but tcp_listen_pcbs is NULL",
|
---|
1483 | tcp_listen_pcbs.listen_pcbs != NULL);
|
---|
1484 | for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
|
---|
1485 | if ((lpcb->local_port == pcb->local_port) &&
|
---|
1486 | (ip_addr_isany(&lpcb->local_ip) ||
|
---|
1487 | ip_addr_cmp(&pcb->local_ip, &lpcb->local_ip))) {
|
---|
1488 | /* port and address of the listen pcb match the timed-out pcb */
|
---|
1489 | LWIP_ASSERT("tcp_pcb_purge: listen pcb does not have accepts pending",
|
---|
1490 | lpcb->accepts_pending > 0);
|
---|
1491 | lpcb->accepts_pending--;
|
---|
1492 | break;
|
---|
1493 | }
|
---|
1494 | }
|
---|
1495 | }
|
---|
1496 | #endif /* TCP_LISTEN_BACKLOG */
|
---|
1497 |
|
---|
1498 |
|
---|
1499 | if (pcb->refused_data != NULL) {
|
---|
1500 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
|
---|
1501 | pbuf_free(pcb->refused_data);
|
---|
1502 | pcb->refused_data = NULL;
|
---|
1503 | }
|
---|
1504 | if (pcb->unsent != NULL) {
|
---|
1505 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
|
---|
1506 | }
|
---|
1507 | if (pcb->unacked != NULL) {
|
---|
1508 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
|
---|
1509 | }
|
---|
1510 | #if TCP_QUEUE_OOSEQ
|
---|
1511 | if (pcb->ooseq != NULL) {
|
---|
1512 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
|
---|
1513 | }
|
---|
1514 | tcp_segs_free(pcb->ooseq);
|
---|
1515 | pcb->ooseq = NULL;
|
---|
1516 | #endif /* TCP_QUEUE_OOSEQ */
|
---|
1517 |
|
---|
1518 | /* Stop the retransmission timer as it will expect data on unacked
|
---|
1519 | queue if it fires */
|
---|
1520 | pcb->rtime = -1;
|
---|
1521 |
|
---|
1522 | tcp_segs_free(pcb->unsent);
|
---|
1523 | tcp_segs_free(pcb->unacked);
|
---|
1524 | pcb->unacked = pcb->unsent = NULL;
|
---|
1525 | #if TCP_OVERSIZE
|
---|
1526 | pcb->unsent_oversize = 0;
|
---|
1527 | #endif /* TCP_OVERSIZE */
|
---|
1528 | }
|
---|
1529 | }
|
---|
1530 |
|
---|
1531 | /**
|
---|
1532 | * Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
|
---|
1533 | *
|
---|
1534 | * @param pcblist PCB list to purge.
|
---|
1535 | * @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
|
---|
1536 | */
|
---|
1537 | void
|
---|
1538 | tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb)
|
---|
1539 | {
|
---|
1540 | TCP_RMV(pcblist, pcb);
|
---|
1541 |
|
---|
1542 | tcp_pcb_purge(pcb);
|
---|
1543 |
|
---|
1544 | /* if there is an outstanding delayed ACKs, send it */
|
---|
1545 | if (pcb->state != TIME_WAIT &&
|
---|
1546 | pcb->state != LISTEN &&
|
---|
1547 | pcb->flags & TF_ACK_DELAY) {
|
---|
1548 | pcb->flags |= TF_ACK_NOW;
|
---|
1549 | tcp_output(pcb);
|
---|
1550 | }
|
---|
1551 |
|
---|
1552 | if (pcb->state != LISTEN) {
|
---|
1553 | LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
|
---|
1554 | LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
|
---|
1555 | #if TCP_QUEUE_OOSEQ
|
---|
1556 | LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
|
---|
1557 | #endif /* TCP_QUEUE_OOSEQ */
|
---|
1558 | }
|
---|
1559 |
|
---|
1560 | pcb->state = CLOSED;
|
---|
1561 |
|
---|
1562 | LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
|
---|
1563 | }
|
---|
1564 |
|
---|
1565 | /**
|
---|
1566 | * Calculates a new initial sequence number for new connections.
|
---|
1567 | *
|
---|
1568 | * @return u32_t pseudo random sequence number
|
---|
1569 | */
|
---|
1570 | u32_t
|
---|
1571 | tcp_next_iss(void)
|
---|
1572 | {
|
---|
1573 | static u32_t iss = 6510;
|
---|
1574 |
|
---|
1575 | iss += tcp_ticks; /* XXX */
|
---|
1576 | return iss;
|
---|
1577 | }
|
---|
1578 |
|
---|
1579 | #if TCP_CALCULATE_EFF_SEND_MSS
|
---|
1580 | /**
|
---|
1581 | * Calcluates the effective send mss that can be used for a specific IP address
|
---|
1582 | * by using ip_route to determin the netif used to send to the address and
|
---|
1583 | * calculating the minimum of TCP_MSS and that netif's mtu (if set).
|
---|
1584 | */
|
---|
1585 | u16_t
|
---|
1586 | tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr)
|
---|
1587 | {
|
---|
1588 | u16_t mss_s;
|
---|
1589 | struct netif *outif;
|
---|
1590 |
|
---|
1591 | outif = ip_route(addr);
|
---|
1592 | if ((outif != NULL) && (outif->mtu != 0)) {
|
---|
1593 | mss_s = outif->mtu - IP_HLEN - TCP_HLEN;
|
---|
1594 | /* RFC 1122, chap 4.2.2.6:
|
---|
1595 | * Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
|
---|
1596 | * We correct for TCP options in tcp_write(), and don't support IP options.
|
---|
1597 | */
|
---|
1598 | sendmss = LWIP_MIN(sendmss, mss_s);
|
---|
1599 | }
|
---|
1600 | return sendmss;
|
---|
1601 | }
|
---|
1602 | #endif /* TCP_CALCULATE_EFF_SEND_MSS */
|
---|
1603 |
|
---|
1604 | const char*
|
---|
1605 | tcp_debug_state_str(enum tcp_state s)
|
---|
1606 | {
|
---|
1607 | return tcp_state_str[s];
|
---|
1608 | }
|
---|
1609 |
|
---|
1610 | #if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
|
---|
1611 | /**
|
---|
1612 | * Print a tcp header for debugging purposes.
|
---|
1613 | *
|
---|
1614 | * @param tcphdr pointer to a struct tcp_hdr
|
---|
1615 | */
|
---|
1616 | void
|
---|
1617 | tcp_debug_print(struct tcp_hdr *tcphdr)
|
---|
1618 | {
|
---|
1619 | LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
|
---|
1620 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
---|
1621 | LWIP_DEBUGF(TCP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
|
---|
1622 | ntohs(tcphdr->src), ntohs(tcphdr->dest)));
|
---|
1623 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
---|
1624 | LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (seq no)\n",
|
---|
1625 | ntohl(tcphdr->seqno)));
|
---|
1626 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
---|
1627 | LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (ack no)\n",
|
---|
1628 | ntohl(tcphdr->ackno)));
|
---|
1629 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
---|
1630 | LWIP_DEBUGF(TCP_DEBUG, ("| %2"U16_F" | |%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"| %5"U16_F" | (hdrlen, flags (",
|
---|
1631 | TCPH_HDRLEN(tcphdr),
|
---|
1632 | TCPH_FLAGS(tcphdr) >> 5 & 1,
|
---|
1633 | TCPH_FLAGS(tcphdr) >> 4 & 1,
|
---|
1634 | TCPH_FLAGS(tcphdr) >> 3 & 1,
|
---|
1635 | TCPH_FLAGS(tcphdr) >> 2 & 1,
|
---|
1636 | TCPH_FLAGS(tcphdr) >> 1 & 1,
|
---|
1637 | TCPH_FLAGS(tcphdr) & 1,
|
---|
1638 | ntohs(tcphdr->wnd)));
|
---|
1639 | tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
|
---|
1640 | LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
|
---|
1641 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
---|
1642 | LWIP_DEBUGF(TCP_DEBUG, ("| 0x%04"X16_F" | %5"U16_F" | (chksum, urgp)\n",
|
---|
1643 | ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
|
---|
1644 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
---|
1645 | }
|
---|
1646 |
|
---|
1647 | /**
|
---|
1648 | * Print a tcp state for debugging purposes.
|
---|
1649 | *
|
---|
1650 | * @param s enum tcp_state to print
|
---|
1651 | */
|
---|
1652 | void
|
---|
1653 | tcp_debug_print_state(enum tcp_state s)
|
---|
1654 | {
|
---|
1655 | LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
|
---|
1656 | }
|
---|
1657 |
|
---|
1658 | /**
|
---|
1659 | * Print tcp flags for debugging purposes.
|
---|
1660 | *
|
---|
1661 | * @param flags tcp flags, all active flags are printed
|
---|
1662 | */
|
---|
1663 | void
|
---|
1664 | tcp_debug_print_flags(u8_t flags)
|
---|
1665 | {
|
---|
1666 | if (flags & TCP_FIN) {
|
---|
1667 | LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
|
---|
1668 | }
|
---|
1669 | if (flags & TCP_SYN) {
|
---|
1670 | LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
|
---|
1671 | }
|
---|
1672 | if (flags & TCP_RST) {
|
---|
1673 | LWIP_DEBUGF(TCP_DEBUG, ("RST "));
|
---|
1674 | }
|
---|
1675 | if (flags & TCP_PSH) {
|
---|
1676 | LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
|
---|
1677 | }
|
---|
1678 | if (flags & TCP_ACK) {
|
---|
1679 | LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
|
---|
1680 | }
|
---|
1681 | if (flags & TCP_URG) {
|
---|
1682 | LWIP_DEBUGF(TCP_DEBUG, ("URG "));
|
---|
1683 | }
|
---|
1684 | if (flags & TCP_ECE) {
|
---|
1685 | LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
|
---|
1686 | }
|
---|
1687 | if (flags & TCP_CWR) {
|
---|
1688 | LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
|
---|
1689 | }
|
---|
1690 | LWIP_DEBUGF(TCP_DEBUG, ("\n"));
|
---|
1691 | }
|
---|
1692 |
|
---|
1693 | /**
|
---|
1694 | * Print all tcp_pcbs in every list for debugging purposes.
|
---|
1695 | */
|
---|
1696 | void
|
---|
1697 | tcp_debug_print_pcbs(void)
|
---|
1698 | {
|
---|
1699 | struct tcp_pcb *pcb;
|
---|
1700 | LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
|
---|
1701 | for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
|
---|
1702 | LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
|
---|
1703 | pcb->local_port, pcb->remote_port,
|
---|
1704 | pcb->snd_nxt, pcb->rcv_nxt));
|
---|
1705 | tcp_debug_print_state(pcb->state);
|
---|
1706 | }
|
---|
1707 | LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
|
---|
1708 | for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
|
---|
1709 | LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
|
---|
1710 | pcb->local_port, pcb->remote_port,
|
---|
1711 | pcb->snd_nxt, pcb->rcv_nxt));
|
---|
1712 | tcp_debug_print_state(pcb->state);
|
---|
1713 | }
|
---|
1714 | LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
|
---|
1715 | for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
|
---|
1716 | LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
|
---|
1717 | pcb->local_port, pcb->remote_port,
|
---|
1718 | pcb->snd_nxt, pcb->rcv_nxt));
|
---|
1719 | tcp_debug_print_state(pcb->state);
|
---|
1720 | }
|
---|
1721 | }
|
---|
1722 |
|
---|
1723 | /**
|
---|
1724 | * Check state consistency of the tcp_pcb lists.
|
---|
1725 | */
|
---|
1726 | s16_t
|
---|
1727 | tcp_pcbs_sane(void)
|
---|
1728 | {
|
---|
1729 | struct tcp_pcb *pcb;
|
---|
1730 | for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
|
---|
1731 | LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
|
---|
1732 | LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
|
---|
1733 | LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
|
---|
1734 | }
|
---|
1735 | for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
|
---|
1736 | LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
|
---|
1737 | }
|
---|
1738 | return 1;
|
---|
1739 | }
|
---|
1740 | #endif /* TCP_DEBUG */
|
---|
1741 |
|
---|
1742 | #endif /* LWIP_TCP */
|
---|