1 | /**
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2 | * @file
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3 | * Transmission Control Protocol for IP
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4 | * See also @ref tcp_raw
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5 | *
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6 | * @defgroup tcp_raw TCP
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7 | * @ingroup callbackstyle_api
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8 | * Transmission Control Protocol for IP\n
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9 | * @see @ref api
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10 | *
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11 | * Common functions for the TCP implementation, such as functions
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12 | * for manipulating the data structures and the TCP timer functions. TCP functions
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13 | * related to input and output is found in tcp_in.c and tcp_out.c respectively.\n
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14 | *
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15 | * TCP connection setup
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16 | * --------------------
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17 | * The functions used for setting up connections is similar to that of
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18 | * the sequential API and of the BSD socket API. A new TCP connection
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19 | * identifier (i.e., a protocol control block - PCB) is created with the
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20 | * tcp_new() function. This PCB can then be either set to listen for new
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21 | * incoming connections or be explicitly connected to another host.
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22 | * - tcp_new()
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23 | * - tcp_bind()
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24 | * - tcp_listen() and tcp_listen_with_backlog()
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25 | * - tcp_accept()
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26 | * - tcp_connect()
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27 | *
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28 | * Sending TCP data
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29 | * ----------------
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30 | * TCP data is sent by enqueueing the data with a call to tcp_write() and
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31 | * triggering to send by calling tcp_output(). When the data is successfully
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32 | * transmitted to the remote host, the application will be notified with a
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33 | * call to a specified callback function.
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34 | * - tcp_write()
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35 | * - tcp_output()
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36 | * - tcp_sent()
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37 | *
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38 | * Receiving TCP data
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39 | * ------------------
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40 | * TCP data reception is callback based - an application specified
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41 | * callback function is called when new data arrives. When the
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42 | * application has taken the data, it has to call the tcp_recved()
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43 | * function to indicate that TCP can advertise increase the receive
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44 | * window.
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45 | * - tcp_recv()
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46 | * - tcp_recved()
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47 | *
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48 | * Application polling
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49 | * -------------------
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50 | * When a connection is idle (i.e., no data is either transmitted or
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51 | * received), lwIP will repeatedly poll the application by calling a
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52 | * specified callback function. This can be used either as a watchdog
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53 | * timer for killing connections that have stayed idle for too long, or
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54 | * as a method of waiting for memory to become available. For instance,
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55 | * if a call to tcp_write() has failed because memory wasn't available,
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56 | * the application may use the polling functionality to call tcp_write()
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57 | * again when the connection has been idle for a while.
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58 | * - tcp_poll()
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59 | *
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60 | * Closing and aborting connections
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61 | * --------------------------------
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62 | * - tcp_close()
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63 | * - tcp_abort()
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64 | * - tcp_err()
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65 | *
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66 | */
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67 |
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68 | /*
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69 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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70 | * All rights reserved.
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71 | *
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72 | * Redistribution and use in source and binary forms, with or without modification,
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73 | * are permitted provided that the following conditions are met:
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74 | *
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75 | * 1. Redistributions of source code must retain the above copyright notice,
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76 | * this list of conditions and the following disclaimer.
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77 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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78 | * this list of conditions and the following disclaimer in the documentation
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79 | * and/or other materials provided with the distribution.
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80 | * 3. The name of the author may not be used to endorse or promote products
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81 | * derived from this software without specific prior written permission.
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82 | *
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83 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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84 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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85 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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86 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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87 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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88 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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89 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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90 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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91 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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92 | * OF SUCH DAMAGE.
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93 | *
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94 | * This file is part of the lwIP TCP/IP stack.
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95 | *
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96 | * Author: Adam Dunkels <adam@sics.se>
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97 | *
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98 | */
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99 |
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100 | #include "lwip/opt.h"
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101 |
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102 | #if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
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103 |
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104 | #include "lwip/def.h"
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105 | #include "lwip/mem.h"
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106 | #include "lwip/memp.h"
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107 | #include "lwip/tcp.h"
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108 | #include "lwip/priv/tcp_priv.h"
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109 | #include "lwip/debug.h"
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110 | #include "lwip/stats.h"
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111 | #include "lwip/ip6.h"
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112 | #include "lwip/ip6_addr.h"
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113 | #include "lwip/nd6.h"
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114 |
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115 | #include <string.h>
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116 |
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117 | #ifdef LWIP_HOOK_FILENAME
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118 | #include LWIP_HOOK_FILENAME
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119 | #endif
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120 |
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121 | #ifndef TCP_LOCAL_PORT_RANGE_START
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122 | /* From http://www.iana.org/assignments/port-numbers:
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123 | "The Dynamic and/or Private Ports are those from 49152 through 65535" */
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124 | #define TCP_LOCAL_PORT_RANGE_START 0xc000
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125 | #define TCP_LOCAL_PORT_RANGE_END 0xffff
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126 | #define TCP_ENSURE_LOCAL_PORT_RANGE(port) ((u16_t)(((port) & (u16_t)~TCP_LOCAL_PORT_RANGE_START) + TCP_LOCAL_PORT_RANGE_START))
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127 | #endif
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128 |
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129 | #if LWIP_TCP_KEEPALIVE
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130 | #define TCP_KEEP_DUR(pcb) ((pcb)->keep_cnt * (pcb)->keep_intvl)
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131 | #define TCP_KEEP_INTVL(pcb) ((pcb)->keep_intvl)
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132 | #else /* LWIP_TCP_KEEPALIVE */
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133 | #define TCP_KEEP_DUR(pcb) TCP_MAXIDLE
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134 | #define TCP_KEEP_INTVL(pcb) TCP_KEEPINTVL_DEFAULT
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135 | #endif /* LWIP_TCP_KEEPALIVE */
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136 |
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137 | /* As initial send MSS, we use TCP_MSS but limit it to 536. */
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138 | #if TCP_MSS > 536
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139 | #define INITIAL_MSS 536
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140 | #else
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141 | #define INITIAL_MSS TCP_MSS
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142 | #endif
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143 |
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144 | static const char *const tcp_state_str[] = {
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145 | "CLOSED",
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146 | "LISTEN",
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147 | "SYN_SENT",
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148 | "SYN_RCVD",
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149 | "ESTABLISHED",
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150 | "FIN_WAIT_1",
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151 | "FIN_WAIT_2",
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152 | "CLOSE_WAIT",
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153 | "CLOSING",
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154 | "LAST_ACK",
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155 | "TIME_WAIT"
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156 | };
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157 |
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158 | /* last local TCP port */
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159 | static u16_t tcp_port = TCP_LOCAL_PORT_RANGE_START;
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160 |
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161 | /* Incremented every coarse grained timer shot (typically every 500 ms). */
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162 | u32_t tcp_ticks;
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163 | static const u8_t tcp_backoff[13] =
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164 | { 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
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165 | /* Times per slowtmr hits */
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166 | static const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
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167 |
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168 | /* The TCP PCB lists. */
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169 |
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170 | /** List of all TCP PCBs bound but not yet (connected || listening) */
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171 | struct tcp_pcb *tcp_bound_pcbs;
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172 | /** List of all TCP PCBs in LISTEN state */
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173 | union tcp_listen_pcbs_t tcp_listen_pcbs;
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174 | /** List of all TCP PCBs that are in a state in which
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175 | * they accept or send data. */
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176 | struct tcp_pcb *tcp_active_pcbs;
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177 | /** List of all TCP PCBs in TIME-WAIT state */
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178 | struct tcp_pcb *tcp_tw_pcbs;
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179 |
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180 | /** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
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181 | struct tcp_pcb **const tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
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182 | &tcp_active_pcbs, &tcp_tw_pcbs
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183 | };
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184 |
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185 | u8_t tcp_active_pcbs_changed;
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186 |
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187 | /** Timer counter to handle calling slow-timer from tcp_tmr() */
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188 | static u8_t tcp_timer;
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189 | static u8_t tcp_timer_ctr;
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190 | static u16_t tcp_new_port(void);
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191 |
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192 | static err_t tcp_close_shutdown_fin(struct tcp_pcb *pcb);
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193 | #if LWIP_TCP_PCB_NUM_EXT_ARGS
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194 | static void tcp_ext_arg_invoke_callbacks_destroyed(struct tcp_pcb_ext_args *ext_args);
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195 | #endif
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196 |
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197 | /**
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198 | * Initialize this module.
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199 | */
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200 | void
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201 | tcp_init(void)
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202 | {
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203 | #ifdef LWIP_RAND
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204 | tcp_port = TCP_ENSURE_LOCAL_PORT_RANGE(LWIP_RAND());
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205 | #endif /* LWIP_RAND */
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206 | }
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207 |
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208 | /** Free a tcp pcb */
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209 | void
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210 | tcp_free(struct tcp_pcb *pcb)
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211 | {
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212 | LWIP_ASSERT("tcp_free: LISTEN", pcb->state != LISTEN);
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213 | #if LWIP_TCP_PCB_NUM_EXT_ARGS
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214 | tcp_ext_arg_invoke_callbacks_destroyed(pcb->ext_args);
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215 | #endif
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216 | memp_free(MEMP_TCP_PCB, pcb);
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217 | }
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218 |
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219 | /** Free a tcp listen pcb */
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220 | static void
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221 | tcp_free_listen(struct tcp_pcb *pcb)
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222 | {
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223 | LWIP_ASSERT("tcp_free_listen: !LISTEN", pcb->state != LISTEN);
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224 | #if LWIP_TCP_PCB_NUM_EXT_ARGS
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225 | tcp_ext_arg_invoke_callbacks_destroyed(pcb->ext_args);
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226 | #endif
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227 | memp_free(MEMP_TCP_PCB_LISTEN, pcb);
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228 | }
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229 |
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230 | /**
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231 | * Called periodically to dispatch TCP timers.
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232 | */
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233 | void
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234 | tcp_tmr(void)
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235 | {
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236 | /* Call tcp_fasttmr() every 250 ms */
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237 | tcp_fasttmr();
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238 |
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239 | if (++tcp_timer & 1) {
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240 | /* Call tcp_slowtmr() every 500 ms, i.e., every other timer
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241 | tcp_tmr() is called. */
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242 | tcp_slowtmr();
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243 | }
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244 | }
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245 |
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246 | #if LWIP_CALLBACK_API || TCP_LISTEN_BACKLOG
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247 | /** Called when a listen pcb is closed. Iterates one pcb list and removes the
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248 | * closed listener pcb from pcb->listener if matching.
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249 | */
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250 | static void
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251 | tcp_remove_listener(struct tcp_pcb *list, struct tcp_pcb_listen *lpcb)
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252 | {
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253 | struct tcp_pcb *pcb;
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254 |
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255 | LWIP_ASSERT("tcp_remove_listener: invalid listener", lpcb != NULL);
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256 |
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257 | for (pcb = list; pcb != NULL; pcb = pcb->next) {
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258 | if (pcb->listener == lpcb) {
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259 | pcb->listener = NULL;
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260 | }
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261 | }
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262 | }
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263 | #endif
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264 |
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265 | /** Called when a listen pcb is closed. Iterates all pcb lists and removes the
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266 | * closed listener pcb from pcb->listener if matching.
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267 | */
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268 | static void
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269 | tcp_listen_closed(struct tcp_pcb *pcb)
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270 | {
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271 | #if LWIP_CALLBACK_API || TCP_LISTEN_BACKLOG
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272 | size_t i;
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273 | LWIP_ASSERT("pcb != NULL", pcb != NULL);
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274 | LWIP_ASSERT("pcb->state == LISTEN", pcb->state == LISTEN);
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275 | for (i = 1; i < LWIP_ARRAYSIZE(tcp_pcb_lists); i++) {
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276 | tcp_remove_listener(*tcp_pcb_lists[i], (struct tcp_pcb_listen *)pcb);
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277 | }
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278 | #endif
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279 | LWIP_UNUSED_ARG(pcb);
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280 | }
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281 |
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282 | #if TCP_LISTEN_BACKLOG
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283 | /** @ingroup tcp_raw
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284 | * Delay accepting a connection in respect to the listen backlog:
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285 | * the number of outstanding connections is increased until
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286 | * tcp_backlog_accepted() is called.
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287 | *
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288 | * ATTENTION: the caller is responsible for calling tcp_backlog_accepted()
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289 | * or else the backlog feature will get out of sync!
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290 | *
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291 | * @param pcb the connection pcb which is not fully accepted yet
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292 | */
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293 | void
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294 | tcp_backlog_delayed(struct tcp_pcb *pcb)
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295 | {
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296 | LWIP_ASSERT("pcb != NULL", pcb != NULL);
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297 | LWIP_ASSERT_CORE_LOCKED();
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298 | if ((pcb->flags & TF_BACKLOGPEND) == 0) {
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299 | if (pcb->listener != NULL) {
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300 | pcb->listener->accepts_pending++;
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301 | LWIP_ASSERT("accepts_pending != 0", pcb->listener->accepts_pending != 0);
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302 | tcp_set_flags(pcb, TF_BACKLOGPEND);
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303 | }
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304 | }
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305 | }
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306 |
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307 | /** @ingroup tcp_raw
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308 | * A delayed-accept a connection is accepted (or closed/aborted): decreases
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309 | * the number of outstanding connections after calling tcp_backlog_delayed().
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310 | *
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311 | * ATTENTION: the caller is responsible for calling tcp_backlog_accepted()
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312 | * or else the backlog feature will get out of sync!
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313 | *
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314 | * @param pcb the connection pcb which is now fully accepted (or closed/aborted)
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315 | */
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316 | void
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317 | tcp_backlog_accepted(struct tcp_pcb *pcb)
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318 | {
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319 | LWIP_ASSERT("pcb != NULL", pcb != NULL);
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320 | LWIP_ASSERT_CORE_LOCKED();
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321 | if ((pcb->flags & TF_BACKLOGPEND) != 0) {
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322 | if (pcb->listener != NULL) {
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323 | LWIP_ASSERT("accepts_pending != 0", pcb->listener->accepts_pending != 0);
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324 | pcb->listener->accepts_pending--;
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325 | tcp_clear_flags(pcb, TF_BACKLOGPEND);
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326 | }
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327 | }
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328 | }
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329 | #endif /* TCP_LISTEN_BACKLOG */
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330 |
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331 | /**
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332 | * Closes the TX side of a connection held by the PCB.
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333 | * For tcp_close(), a RST is sent if the application didn't receive all data
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334 | * (tcp_recved() not called for all data passed to recv callback).
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335 | *
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336 | * Listening pcbs are freed and may not be referenced any more.
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337 | * Connection pcbs are freed if not yet connected and may not be referenced
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338 | * any more. If a connection is established (at least SYN received or in
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339 | * a closing state), the connection is closed, and put in a closing state.
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340 | * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
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341 | * unsafe to reference it.
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342 | *
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343 | * @param pcb the tcp_pcb to close
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344 | * @return ERR_OK if connection has been closed
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345 | * another err_t if closing failed and pcb is not freed
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346 | */
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347 | static err_t
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348 | tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
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349 | {
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350 | LWIP_ASSERT("tcp_close_shutdown: invalid pcb", pcb != NULL);
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351 |
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352 | if (rst_on_unacked_data && ((pcb->state == ESTABLISHED) || (pcb->state == CLOSE_WAIT))) {
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353 | if ((pcb->refused_data != NULL) || (pcb->rcv_wnd != TCP_WND_MAX(pcb))) {
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354 | /* Not all data received by application, send RST to tell the remote
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355 | side about this. */
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356 | LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
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357 |
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358 | /* don't call tcp_abort here: we must not deallocate the pcb since
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359 | that might not be expected when calling tcp_close */
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360 | tcp_rst(pcb, pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
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361 | pcb->local_port, pcb->remote_port);
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362 |
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363 | tcp_pcb_purge(pcb);
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364 | TCP_RMV_ACTIVE(pcb);
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365 | /* Deallocate the pcb since we already sent a RST for it */
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366 | if (tcp_input_pcb == pcb) {
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367 | /* prevent using a deallocated pcb: free it from tcp_input later */
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368 | tcp_trigger_input_pcb_close();
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369 | } else {
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370 | tcp_free(pcb);
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371 | }
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372 | return ERR_OK;
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373 | }
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374 | }
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375 |
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376 | /* - states which free the pcb are handled here,
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377 | - states which send FIN and change state are handled in tcp_close_shutdown_fin() */
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378 | switch (pcb->state) {
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379 | case CLOSED:
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380 | /* Closing a pcb in the CLOSED state might seem erroneous,
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381 | * however, it is in this state once allocated and as yet unused
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382 | * and the user needs some way to free it should the need arise.
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383 | * Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
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384 | * or for a pcb that has been used and then entered the CLOSED state
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385 | * is erroneous, but this should never happen as the pcb has in those cases
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386 | * been freed, and so any remaining handles are bogus. */
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387 | if (pcb->local_port != 0) {
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388 | TCP_RMV(&tcp_bound_pcbs, pcb);
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389 | }
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390 | tcp_free(pcb);
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391 | break;
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392 | case LISTEN:
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393 | tcp_listen_closed(pcb);
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394 | tcp_pcb_remove(&tcp_listen_pcbs.pcbs, pcb);
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395 | tcp_free_listen(pcb);
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396 | break;
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397 | case SYN_SENT:
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398 | TCP_PCB_REMOVE_ACTIVE(pcb);
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399 | tcp_free(pcb);
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400 | MIB2_STATS_INC(mib2.tcpattemptfails);
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401 | break;
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402 | default:
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403 | return tcp_close_shutdown_fin(pcb);
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404 | }
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405 | return ERR_OK;
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406 | }
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407 |
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408 | static err_t
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409 | tcp_close_shutdown_fin(struct tcp_pcb *pcb)
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410 | {
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411 | err_t err;
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412 | LWIP_ASSERT("pcb != NULL", pcb != NULL);
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413 |
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414 | switch (pcb->state) {
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415 | case SYN_RCVD:
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416 | err = tcp_send_fin(pcb);
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417 | if (err == ERR_OK) {
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418 | tcp_backlog_accepted(pcb);
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419 | MIB2_STATS_INC(mib2.tcpattemptfails);
|
---|
420 | pcb->state = FIN_WAIT_1;
|
---|
421 | }
|
---|
422 | break;
|
---|
423 | case ESTABLISHED:
|
---|
424 | err = tcp_send_fin(pcb);
|
---|
425 | if (err == ERR_OK) {
|
---|
426 | MIB2_STATS_INC(mib2.tcpestabresets);
|
---|
427 | pcb->state = FIN_WAIT_1;
|
---|
428 | }
|
---|
429 | break;
|
---|
430 | case CLOSE_WAIT:
|
---|
431 | err = tcp_send_fin(pcb);
|
---|
432 | if (err == ERR_OK) {
|
---|
433 | MIB2_STATS_INC(mib2.tcpestabresets);
|
---|
434 | pcb->state = LAST_ACK;
|
---|
435 | }
|
---|
436 | break;
|
---|
437 | default:
|
---|
438 | /* Has already been closed, do nothing. */
|
---|
439 | return ERR_OK;
|
---|
440 | }
|
---|
441 |
|
---|
442 | if (err == ERR_OK) {
|
---|
443 | /* To ensure all data has been sent when tcp_close returns, we have
|
---|
444 | to make sure tcp_output doesn't fail.
|
---|
445 | Since we don't really have to ensure all data has been sent when tcp_close
|
---|
446 | returns (unsent data is sent from tcp timer functions, also), we don't care
|
---|
447 | for the return value of tcp_output for now. */
|
---|
448 | tcp_output(pcb);
|
---|
449 | } else if (err == ERR_MEM) {
|
---|
450 | /* Mark this pcb for closing. Closing is retried from tcp_tmr. */
|
---|
451 | tcp_set_flags(pcb, TF_CLOSEPEND);
|
---|
452 | /* We have to return ERR_OK from here to indicate to the callers that this
|
---|
453 | pcb should not be used any more as it will be freed soon via tcp_tmr.
|
---|
454 | This is OK here since sending FIN does not guarantee a time frime for
|
---|
455 | actually freeing the pcb, either (it is left in closure states for
|
---|
456 | remote ACK or timeout) */
|
---|
457 | return ERR_OK;
|
---|
458 | }
|
---|
459 | return err;
|
---|
460 | }
|
---|
461 |
|
---|
462 | /**
|
---|
463 | * @ingroup tcp_raw
|
---|
464 | * Closes the connection held by the PCB.
|
---|
465 | *
|
---|
466 | * Listening pcbs are freed and may not be referenced any more.
|
---|
467 | * Connection pcbs are freed if not yet connected and may not be referenced
|
---|
468 | * any more. If a connection is established (at least SYN received or in
|
---|
469 | * a closing state), the connection is closed, and put in a closing state.
|
---|
470 | * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
|
---|
471 | * unsafe to reference it (unless an error is returned).
|
---|
472 | *
|
---|
473 | * The function may return ERR_MEM if no memory
|
---|
474 | * was available for closing the connection. If so, the application
|
---|
475 | * should wait and try again either by using the acknowledgment
|
---|
476 | * callback or the polling functionality. If the close succeeds, the
|
---|
477 | * function returns ERR_OK.
|
---|
478 | *
|
---|
479 | * @param pcb the tcp_pcb to close
|
---|
480 | * @return ERR_OK if connection has been closed
|
---|
481 | * another err_t if closing failed and pcb is not freed
|
---|
482 | */
|
---|
483 | err_t
|
---|
484 | tcp_close(struct tcp_pcb *pcb)
|
---|
485 | {
|
---|
486 | LWIP_ASSERT_CORE_LOCKED();
|
---|
487 |
|
---|
488 | LWIP_ERROR("tcp_close: invalid pcb", pcb != NULL, return ERR_ARG);
|
---|
489 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
|
---|
490 |
|
---|
491 | tcp_debug_print_state(pcb->state);
|
---|
492 |
|
---|
493 | if (pcb->state != LISTEN) {
|
---|
494 | /* Set a flag not to receive any more data... */
|
---|
495 | tcp_set_flags(pcb, TF_RXCLOSED);
|
---|
496 | }
|
---|
497 | /* ... and close */
|
---|
498 | return tcp_close_shutdown(pcb, 1);
|
---|
499 | }
|
---|
500 |
|
---|
501 | /**
|
---|
502 | * @ingroup tcp_raw
|
---|
503 | * Causes all or part of a full-duplex connection of this PCB to be shut down.
|
---|
504 | * This doesn't deallocate the PCB unless shutting down both sides!
|
---|
505 | * Shutting down both sides is the same as calling tcp_close, so if it succeds
|
---|
506 | * (i.e. returns ER_OK), the PCB must not be referenced any more!
|
---|
507 | *
|
---|
508 | * @param pcb PCB to shutdown
|
---|
509 | * @param shut_rx shut down receive side if this is != 0
|
---|
510 | * @param shut_tx shut down send side if this is != 0
|
---|
511 | * @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
|
---|
512 | * another err_t on error.
|
---|
513 | */
|
---|
514 | err_t
|
---|
515 | tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
|
---|
516 | {
|
---|
517 | LWIP_ASSERT_CORE_LOCKED();
|
---|
518 |
|
---|
519 | LWIP_ERROR("tcp_shutdown: invalid pcb", pcb != NULL, return ERR_ARG);
|
---|
520 |
|
---|
521 | if (pcb->state == LISTEN) {
|
---|
522 | return ERR_CONN;
|
---|
523 | }
|
---|
524 | if (shut_rx) {
|
---|
525 | /* shut down the receive side: set a flag not to receive any more data... */
|
---|
526 | tcp_set_flags(pcb, TF_RXCLOSED);
|
---|
527 | if (shut_tx) {
|
---|
528 | /* shutting down the tx AND rx side is the same as closing for the raw API */
|
---|
529 | return tcp_close_shutdown(pcb, 1);
|
---|
530 | }
|
---|
531 | /* ... and free buffered data */
|
---|
532 | if (pcb->refused_data != NULL) {
|
---|
533 | pbuf_free(pcb->refused_data);
|
---|
534 | pcb->refused_data = NULL;
|
---|
535 | }
|
---|
536 | }
|
---|
537 | if (shut_tx) {
|
---|
538 | /* This can't happen twice since if it succeeds, the pcb's state is changed.
|
---|
539 | Only close in these states as the others directly deallocate the PCB */
|
---|
540 | switch (pcb->state) {
|
---|
541 | case SYN_RCVD:
|
---|
542 | case ESTABLISHED:
|
---|
543 | case CLOSE_WAIT:
|
---|
544 | return tcp_close_shutdown(pcb, (u8_t)shut_rx);
|
---|
545 | default:
|
---|
546 | /* Not (yet?) connected, cannot shutdown the TX side as that would bring us
|
---|
547 | into CLOSED state, where the PCB is deallocated. */
|
---|
548 | return ERR_CONN;
|
---|
549 | }
|
---|
550 | }
|
---|
551 | return ERR_OK;
|
---|
552 | }
|
---|
553 |
|
---|
554 | /**
|
---|
555 | * Abandons a connection and optionally sends a RST to the remote
|
---|
556 | * host. Deletes the local protocol control block. This is done when
|
---|
557 | * a connection is killed because of shortage of memory.
|
---|
558 | *
|
---|
559 | * @param pcb the tcp_pcb to abort
|
---|
560 | * @param reset boolean to indicate whether a reset should be sent
|
---|
561 | */
|
---|
562 | void
|
---|
563 | tcp_abandon(struct tcp_pcb *pcb, int reset)
|
---|
564 | {
|
---|
565 | u32_t seqno, ackno;
|
---|
566 | #if LWIP_CALLBACK_API
|
---|
567 | tcp_err_fn errf;
|
---|
568 | #endif /* LWIP_CALLBACK_API */
|
---|
569 | void *errf_arg;
|
---|
570 |
|
---|
571 | LWIP_ASSERT_CORE_LOCKED();
|
---|
572 |
|
---|
573 | LWIP_ERROR("tcp_abandon: invalid pcb", pcb != NULL, return);
|
---|
574 |
|
---|
575 | /* pcb->state LISTEN not allowed here */
|
---|
576 | LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
|
---|
577 | pcb->state != LISTEN);
|
---|
578 | /* Figure out on which TCP PCB list we are, and remove us. If we
|
---|
579 | are in an active state, call the receive function associated with
|
---|
580 | the PCB with a NULL argument, and send an RST to the remote end. */
|
---|
581 | if (pcb->state == TIME_WAIT) {
|
---|
582 | tcp_pcb_remove(&tcp_tw_pcbs, pcb);
|
---|
583 | tcp_free(pcb);
|
---|
584 | } else {
|
---|
585 | int send_rst = 0;
|
---|
586 | u16_t local_port = 0;
|
---|
587 | enum tcp_state last_state;
|
---|
588 | seqno = pcb->snd_nxt;
|
---|
589 | ackno = pcb->rcv_nxt;
|
---|
590 | #if LWIP_CALLBACK_API
|
---|
591 | errf = pcb->errf;
|
---|
592 | #endif /* LWIP_CALLBACK_API */
|
---|
593 | errf_arg = pcb->callback_arg;
|
---|
594 | if (pcb->state == CLOSED) {
|
---|
595 | if (pcb->local_port != 0) {
|
---|
596 | /* bound, not yet opened */
|
---|
597 | TCP_RMV(&tcp_bound_pcbs, pcb);
|
---|
598 | }
|
---|
599 | } else {
|
---|
600 | send_rst = reset;
|
---|
601 | local_port = pcb->local_port;
|
---|
602 | TCP_PCB_REMOVE_ACTIVE(pcb);
|
---|
603 | }
|
---|
604 | if (pcb->unacked != NULL) {
|
---|
605 | tcp_segs_free(pcb->unacked);
|
---|
606 | }
|
---|
607 | if (pcb->unsent != NULL) {
|
---|
608 | tcp_segs_free(pcb->unsent);
|
---|
609 | }
|
---|
610 | #if TCP_QUEUE_OOSEQ
|
---|
611 | if (pcb->ooseq != NULL) {
|
---|
612 | tcp_segs_free(pcb->ooseq);
|
---|
613 | }
|
---|
614 | #endif /* TCP_QUEUE_OOSEQ */
|
---|
615 | tcp_backlog_accepted(pcb);
|
---|
616 | if (send_rst) {
|
---|
617 | LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
|
---|
618 | tcp_rst(pcb, seqno, ackno, &pcb->local_ip, &pcb->remote_ip, local_port, pcb->remote_port);
|
---|
619 | }
|
---|
620 | last_state = pcb->state;
|
---|
621 | tcp_free(pcb);
|
---|
622 | TCP_EVENT_ERR(last_state, errf, errf_arg, ERR_ABRT);
|
---|
623 | }
|
---|
624 | }
|
---|
625 |
|
---|
626 | /**
|
---|
627 | * @ingroup tcp_raw
|
---|
628 | * Aborts the connection by sending a RST (reset) segment to the remote
|
---|
629 | * host. The pcb is deallocated. This function never fails.
|
---|
630 | *
|
---|
631 | * ATTENTION: When calling this from one of the TCP callbacks, make
|
---|
632 | * sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
|
---|
633 | * or you will risk accessing deallocated memory or memory leaks!
|
---|
634 | *
|
---|
635 | * @param pcb the tcp pcb to abort
|
---|
636 | */
|
---|
637 | void
|
---|
638 | tcp_abort(struct tcp_pcb *pcb)
|
---|
639 | {
|
---|
640 | tcp_abandon(pcb, 1);
|
---|
641 | }
|
---|
642 |
|
---|
643 | /**
|
---|
644 | * @ingroup tcp_raw
|
---|
645 | * Binds the connection to a local port number and IP address. If the
|
---|
646 | * IP address is not given (i.e., ipaddr == IP_ANY_TYPE), the connection is
|
---|
647 | * bound to all local IP addresses.
|
---|
648 | * If another connection is bound to the same port, the function will
|
---|
649 | * return ERR_USE, otherwise ERR_OK is returned.
|
---|
650 | *
|
---|
651 | * @param pcb the tcp_pcb to bind (no check is done whether this pcb is
|
---|
652 | * already bound!)
|
---|
653 | * @param ipaddr the local ip address to bind to (use IPx_ADDR_ANY to bind
|
---|
654 | * to any local address
|
---|
655 | * @param port the local port to bind to
|
---|
656 | * @return ERR_USE if the port is already in use
|
---|
657 | * ERR_VAL if bind failed because the PCB is not in a valid state
|
---|
658 | * ERR_OK if bound
|
---|
659 | */
|
---|
660 | err_t
|
---|
661 | tcp_bind(struct tcp_pcb *pcb, const ip_addr_t *ipaddr, u16_t port)
|
---|
662 | {
|
---|
663 | int i;
|
---|
664 | int max_pcb_list = NUM_TCP_PCB_LISTS;
|
---|
665 | struct tcp_pcb *cpcb;
|
---|
666 | #if LWIP_IPV6 && LWIP_IPV6_SCOPES
|
---|
667 | ip_addr_t zoned_ipaddr;
|
---|
668 | #endif /* LWIP_IPV6 && LWIP_IPV6_SCOPES */
|
---|
669 |
|
---|
670 | LWIP_ASSERT_CORE_LOCKED();
|
---|
671 |
|
---|
672 | #if LWIP_IPV4
|
---|
673 | /* Don't propagate NULL pointer (IPv4 ANY) to subsequent functions */
|
---|
674 | if (ipaddr == NULL) {
|
---|
675 | ipaddr = IP4_ADDR_ANY;
|
---|
676 | }
|
---|
677 | #else /* LWIP_IPV4 */
|
---|
678 | LWIP_ERROR("tcp_bind: invalid ipaddr", ipaddr != NULL, return ERR_ARG);
|
---|
679 | #endif /* LWIP_IPV4 */
|
---|
680 |
|
---|
681 | LWIP_ERROR("tcp_bind: invalid pcb", pcb != NULL, return ERR_ARG);
|
---|
682 |
|
---|
683 | LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_VAL);
|
---|
684 |
|
---|
685 | #if SO_REUSE
|
---|
686 | /* Unless the REUSEADDR flag is set,
|
---|
687 | we have to check the pcbs in TIME-WAIT state, also.
|
---|
688 | We do not dump TIME_WAIT pcb's; they can still be matched by incoming
|
---|
689 | packets using both local and remote IP addresses and ports to distinguish.
|
---|
690 | */
|
---|
691 | if (ip_get_option(pcb, SOF_REUSEADDR)) {
|
---|
692 | max_pcb_list = NUM_TCP_PCB_LISTS_NO_TIME_WAIT;
|
---|
693 | }
|
---|
694 | #endif /* SO_REUSE */
|
---|
695 |
|
---|
696 | #if LWIP_IPV6 && LWIP_IPV6_SCOPES
|
---|
697 | /* If the given IP address should have a zone but doesn't, assign one now.
|
---|
698 | * This is legacy support: scope-aware callers should always provide properly
|
---|
699 | * zoned source addresses. Do the zone selection before the address-in-use
|
---|
700 | * check below; as such we have to make a temporary copy of the address. */
|
---|
701 | if (IP_IS_V6(ipaddr) && ip6_addr_lacks_zone(ip_2_ip6(ipaddr), IP6_UNICAST)) {
|
---|
702 | ip_addr_copy(zoned_ipaddr, *ipaddr);
|
---|
703 | ip6_addr_select_zone(ip_2_ip6(&zoned_ipaddr), ip_2_ip6(&zoned_ipaddr));
|
---|
704 | ipaddr = &zoned_ipaddr;
|
---|
705 | }
|
---|
706 | #endif /* LWIP_IPV6 && LWIP_IPV6_SCOPES */
|
---|
707 |
|
---|
708 | if (port == 0) {
|
---|
709 | port = tcp_new_port();
|
---|
710 | if (port == 0) {
|
---|
711 | return ERR_BUF;
|
---|
712 | }
|
---|
713 | } else {
|
---|
714 | /* Check if the address already is in use (on all lists) */
|
---|
715 | for (i = 0; i < max_pcb_list; i++) {
|
---|
716 | for (cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
|
---|
717 | if (cpcb->local_port == port) {
|
---|
718 | #if SO_REUSE
|
---|
719 | /* Omit checking for the same port if both pcbs have REUSEADDR set.
|
---|
720 | For SO_REUSEADDR, the duplicate-check for a 5-tuple is done in
|
---|
721 | tcp_connect. */
|
---|
722 | if (!ip_get_option(pcb, SOF_REUSEADDR) ||
|
---|
723 | !ip_get_option(cpcb, SOF_REUSEADDR))
|
---|
724 | #endif /* SO_REUSE */
|
---|
725 | {
|
---|
726 | /* @todo: check accept_any_ip_version */
|
---|
727 | if ((IP_IS_V6(ipaddr) == IP_IS_V6_VAL(cpcb->local_ip)) &&
|
---|
728 | (ip_addr_isany(&cpcb->local_ip) ||
|
---|
729 | ip_addr_isany(ipaddr) ||
|
---|
730 | ip_addr_cmp(&cpcb->local_ip, ipaddr))) {
|
---|
731 | return ERR_USE;
|
---|
732 | }
|
---|
733 | }
|
---|
734 | }
|
---|
735 | }
|
---|
736 | }
|
---|
737 | }
|
---|
738 |
|
---|
739 | if (!ip_addr_isany(ipaddr)
|
---|
740 | #if LWIP_IPV4 && LWIP_IPV6
|
---|
741 | || (IP_GET_TYPE(ipaddr) != IP_GET_TYPE(&pcb->local_ip))
|
---|
742 | #endif /* LWIP_IPV4 && LWIP_IPV6 */
|
---|
743 | ) {
|
---|
744 | ip_addr_set(&pcb->local_ip, ipaddr);
|
---|
745 | }
|
---|
746 | pcb->local_port = port;
|
---|
747 | TCP_REG(&tcp_bound_pcbs, pcb);
|
---|
748 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
|
---|
749 | return ERR_OK;
|
---|
750 | }
|
---|
751 |
|
---|
752 | /**
|
---|
753 | * @ingroup tcp_raw
|
---|
754 | * Binds the connection to a netif and IP address.
|
---|
755 | * After calling this function, all packets received via this PCB
|
---|
756 | * are guaranteed to have come in via the specified netif, and all
|
---|
757 | * outgoing packets will go out via the specified netif.
|
---|
758 | *
|
---|
759 | * @param pcb the tcp_pcb to bind.
|
---|
760 | * @param netif the netif to bind to. Can be NULL.
|
---|
761 | */
|
---|
762 | void
|
---|
763 | tcp_bind_netif(struct tcp_pcb *pcb, const struct netif *netif)
|
---|
764 | {
|
---|
765 | LWIP_ASSERT_CORE_LOCKED();
|
---|
766 | if (netif != NULL) {
|
---|
767 | pcb->netif_idx = netif_get_index(netif);
|
---|
768 | } else {
|
---|
769 | pcb->netif_idx = NETIF_NO_INDEX;
|
---|
770 | }
|
---|
771 | }
|
---|
772 |
|
---|
773 | #if LWIP_CALLBACK_API
|
---|
774 | /**
|
---|
775 | * Default accept callback if no accept callback is specified by the user.
|
---|
776 | */
|
---|
777 | static err_t
|
---|
778 | tcp_accept_null(void *arg, struct tcp_pcb *pcb, err_t err)
|
---|
779 | {
|
---|
780 | LWIP_UNUSED_ARG(arg);
|
---|
781 | LWIP_UNUSED_ARG(err);
|
---|
782 |
|
---|
783 | LWIP_ASSERT("tcp_accept_null: invalid pcb", pcb != NULL);
|
---|
784 |
|
---|
785 | tcp_abort(pcb);
|
---|
786 |
|
---|
787 | return ERR_ABRT;
|
---|
788 | }
|
---|
789 | #endif /* LWIP_CALLBACK_API */
|
---|
790 |
|
---|
791 | /**
|
---|
792 | * @ingroup tcp_raw
|
---|
793 | * Set the state of the connection to be LISTEN, which means that it
|
---|
794 | * is able to accept incoming connections. The protocol control block
|
---|
795 | * is reallocated in order to consume less memory. Setting the
|
---|
796 | * connection to LISTEN is an irreversible process.
|
---|
797 | * When an incoming connection is accepted, the function specified with
|
---|
798 | * the tcp_accept() function will be called. The pcb has to be bound
|
---|
799 | * to a local port with the tcp_bind() function.
|
---|
800 | *
|
---|
801 | * The tcp_listen() function returns a new connection identifier, and
|
---|
802 | * the one passed as an argument to the function will be
|
---|
803 | * deallocated. The reason for this behavior is that less memory is
|
---|
804 | * needed for a connection that is listening, so tcp_listen() will
|
---|
805 | * reclaim the memory needed for the original connection and allocate a
|
---|
806 | * new smaller memory block for the listening connection.
|
---|
807 | *
|
---|
808 | * tcp_listen() may return NULL if no memory was available for the
|
---|
809 | * listening connection. If so, the memory associated with the pcb
|
---|
810 | * passed as an argument to tcp_listen() will not be deallocated.
|
---|
811 | *
|
---|
812 | * The backlog limits the number of outstanding connections
|
---|
813 | * in the listen queue to the value specified by the backlog argument.
|
---|
814 | * To use it, your need to set TCP_LISTEN_BACKLOG=1 in your lwipopts.h.
|
---|
815 | *
|
---|
816 | * @param pcb the original tcp_pcb
|
---|
817 | * @param backlog the incoming connections queue limit
|
---|
818 | * @return tcp_pcb used for listening, consumes less memory.
|
---|
819 | *
|
---|
820 | * @note The original tcp_pcb is freed. This function therefore has to be
|
---|
821 | * called like this:
|
---|
822 | * tpcb = tcp_listen_with_backlog(tpcb, backlog);
|
---|
823 | */
|
---|
824 | struct tcp_pcb *
|
---|
825 | tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
|
---|
826 | {
|
---|
827 | LWIP_ASSERT_CORE_LOCKED();
|
---|
828 | return tcp_listen_with_backlog_and_err(pcb, backlog, NULL);
|
---|
829 | }
|
---|
830 |
|
---|
831 | /**
|
---|
832 | * @ingroup tcp_raw
|
---|
833 | * Set the state of the connection to be LISTEN, which means that it
|
---|
834 | * is able to accept incoming connections. The protocol control block
|
---|
835 | * is reallocated in order to consume less memory. Setting the
|
---|
836 | * connection to LISTEN is an irreversible process.
|
---|
837 | *
|
---|
838 | * @param pcb the original tcp_pcb
|
---|
839 | * @param backlog the incoming connections queue limit
|
---|
840 | * @param err when NULL is returned, this contains the error reason
|
---|
841 | * @return tcp_pcb used for listening, consumes less memory.
|
---|
842 | *
|
---|
843 | * @note The original tcp_pcb is freed. This function therefore has to be
|
---|
844 | * called like this:
|
---|
845 | * tpcb = tcp_listen_with_backlog_and_err(tpcb, backlog, &err);
|
---|
846 | */
|
---|
847 | struct tcp_pcb *
|
---|
848 | tcp_listen_with_backlog_and_err(struct tcp_pcb *pcb, u8_t backlog, err_t *err)
|
---|
849 | {
|
---|
850 | struct tcp_pcb_listen *lpcb = NULL;
|
---|
851 | err_t res;
|
---|
852 |
|
---|
853 | LWIP_UNUSED_ARG(backlog);
|
---|
854 |
|
---|
855 | LWIP_ASSERT_CORE_LOCKED();
|
---|
856 |
|
---|
857 | LWIP_ERROR("tcp_listen_with_backlog_and_err: invalid pcb", pcb != NULL, res = ERR_ARG; goto done);
|
---|
858 | LWIP_ERROR("tcp_listen_with_backlog_and_err: pcb already connected", pcb->state == CLOSED, res = ERR_CLSD; goto done);
|
---|
859 |
|
---|
860 | /* already listening? */
|
---|
861 | if (pcb->state == LISTEN) {
|
---|
862 | lpcb = (struct tcp_pcb_listen *)pcb;
|
---|
863 | res = ERR_ALREADY;
|
---|
864 | goto done;
|
---|
865 | }
|
---|
866 | #if SO_REUSE
|
---|
867 | if (ip_get_option(pcb, SOF_REUSEADDR)) {
|
---|
868 | /* Since SOF_REUSEADDR allows reusing a local address before the pcb's usage
|
---|
869 | is declared (listen-/connection-pcb), we have to make sure now that
|
---|
870 | this port is only used once for every local IP. */
|
---|
871 | for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
|
---|
872 | if ((lpcb->local_port == pcb->local_port) &&
|
---|
873 | ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
|
---|
874 | /* this address/port is already used */
|
---|
875 | lpcb = NULL;
|
---|
876 | res = ERR_USE;
|
---|
877 | goto done;
|
---|
878 | }
|
---|
879 | }
|
---|
880 | }
|
---|
881 | #endif /* SO_REUSE */
|
---|
882 | lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
|
---|
883 | if (lpcb == NULL) {
|
---|
884 | res = ERR_MEM;
|
---|
885 | goto done;
|
---|
886 | }
|
---|
887 | lpcb->callback_arg = pcb->callback_arg;
|
---|
888 | lpcb->local_port = pcb->local_port;
|
---|
889 | lpcb->state = LISTEN;
|
---|
890 | lpcb->prio = pcb->prio;
|
---|
891 | lpcb->so_options = pcb->so_options;
|
---|
892 | lpcb->netif_idx = NETIF_NO_INDEX;
|
---|
893 | lpcb->ttl = pcb->ttl;
|
---|
894 | lpcb->tos = pcb->tos;
|
---|
895 | #if LWIP_IPV4 && LWIP_IPV6
|
---|
896 | IP_SET_TYPE_VAL(lpcb->remote_ip, pcb->local_ip.type);
|
---|
897 | #endif /* LWIP_IPV4 && LWIP_IPV6 */
|
---|
898 | ip_addr_copy(lpcb->local_ip, pcb->local_ip);
|
---|
899 | if (pcb->local_port != 0) {
|
---|
900 | TCP_RMV(&tcp_bound_pcbs, pcb);
|
---|
901 | }
|
---|
902 | #if LWIP_TCP_PCB_NUM_EXT_ARGS
|
---|
903 | /* copy over ext_args to listening pcb */
|
---|
904 | memcpy(&lpcb->ext_args, &pcb->ext_args, sizeof(pcb->ext_args));
|
---|
905 | #endif
|
---|
906 | tcp_free(pcb);
|
---|
907 | #if LWIP_CALLBACK_API
|
---|
908 | lpcb->accept = tcp_accept_null;
|
---|
909 | #endif /* LWIP_CALLBACK_API */
|
---|
910 | #if TCP_LISTEN_BACKLOG
|
---|
911 | lpcb->accepts_pending = 0;
|
---|
912 | tcp_backlog_set(lpcb, backlog);
|
---|
913 | #endif /* TCP_LISTEN_BACKLOG */
|
---|
914 | TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
|
---|
915 | res = ERR_OK;
|
---|
916 | done:
|
---|
917 | if (err != NULL) {
|
---|
918 | *err = res;
|
---|
919 | }
|
---|
920 | return (struct tcp_pcb *)lpcb;
|
---|
921 | }
|
---|
922 |
|
---|
923 | /**
|
---|
924 | * Update the state that tracks the available window space to advertise.
|
---|
925 | *
|
---|
926 | * Returns how much extra window would be advertised if we sent an
|
---|
927 | * update now.
|
---|
928 | */
|
---|
929 | u32_t
|
---|
930 | tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
|
---|
931 | {
|
---|
932 | u32_t new_right_edge;
|
---|
933 |
|
---|
934 | LWIP_ASSERT("tcp_update_rcv_ann_wnd: invalid pcb", pcb != NULL);
|
---|
935 | new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
|
---|
936 |
|
---|
937 | if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) {
|
---|
938 | /* we can advertise more window */
|
---|
939 | pcb->rcv_ann_wnd = pcb->rcv_wnd;
|
---|
940 | return new_right_edge - pcb->rcv_ann_right_edge;
|
---|
941 | } else {
|
---|
942 | if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
|
---|
943 | /* Can happen due to other end sending out of advertised window,
|
---|
944 | * but within actual available (but not yet advertised) window */
|
---|
945 | pcb->rcv_ann_wnd = 0;
|
---|
946 | } else {
|
---|
947 | /* keep the right edge of window constant */
|
---|
948 | u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
|
---|
949 | #if !LWIP_WND_SCALE
|
---|
950 | LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff", new_rcv_ann_wnd <= 0xffff);
|
---|
951 | #endif
|
---|
952 | pcb->rcv_ann_wnd = (tcpwnd_size_t)new_rcv_ann_wnd;
|
---|
953 | }
|
---|
954 | return 0;
|
---|
955 | }
|
---|
956 | }
|
---|
957 |
|
---|
958 | /**
|
---|
959 | * @ingroup tcp_raw
|
---|
960 | * This function should be called by the application when it has
|
---|
961 | * processed the data. The purpose is to advertise a larger window
|
---|
962 | * when the data has been processed.
|
---|
963 | *
|
---|
964 | * @param pcb the tcp_pcb for which data is read
|
---|
965 | * @param len the amount of bytes that have been read by the application
|
---|
966 | */
|
---|
967 | void
|
---|
968 | tcp_recved(struct tcp_pcb *pcb, u16_t len)
|
---|
969 | {
|
---|
970 | u32_t wnd_inflation;
|
---|
971 | tcpwnd_size_t rcv_wnd;
|
---|
972 |
|
---|
973 | LWIP_ASSERT_CORE_LOCKED();
|
---|
974 |
|
---|
975 | LWIP_ERROR("tcp_recved: invalid pcb", pcb != NULL, return);
|
---|
976 |
|
---|
977 | /* pcb->state LISTEN not allowed here */
|
---|
978 | LWIP_ASSERT("don't call tcp_recved for listen-pcbs",
|
---|
979 | pcb->state != LISTEN);
|
---|
980 |
|
---|
981 | rcv_wnd = (tcpwnd_size_t)(pcb->rcv_wnd + len);
|
---|
982 | if ((rcv_wnd > TCP_WND_MAX(pcb)) || (rcv_wnd < pcb->rcv_wnd)) {
|
---|
983 | /* window got too big or tcpwnd_size_t overflow */
|
---|
984 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: window got too big or tcpwnd_size_t overflow\n"));
|
---|
985 | pcb->rcv_wnd = TCP_WND_MAX(pcb);
|
---|
986 | } else {
|
---|
987 | pcb->rcv_wnd = rcv_wnd;
|
---|
988 | }
|
---|
989 |
|
---|
990 | wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
|
---|
991 |
|
---|
992 | /* If the change in the right edge of window is significant (default
|
---|
993 | * watermark is TCP_WND/4), then send an explicit update now.
|
---|
994 | * Otherwise wait for a packet to be sent in the normal course of
|
---|
995 | * events (or more window to be available later) */
|
---|
996 | if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
|
---|
997 | tcp_ack_now(pcb);
|
---|
998 | tcp_output(pcb);
|
---|
999 | }
|
---|
1000 |
|
---|
1001 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: received %"U16_F" bytes, wnd %"TCPWNDSIZE_F" (%"TCPWNDSIZE_F").\n",
|
---|
1002 | len, pcb->rcv_wnd, (u16_t)(TCP_WND_MAX(pcb) - pcb->rcv_wnd)));
|
---|
1003 | }
|
---|
1004 |
|
---|
1005 | /**
|
---|
1006 | * Allocate a new local TCP port.
|
---|
1007 | *
|
---|
1008 | * @return a new (free) local TCP port number
|
---|
1009 | */
|
---|
1010 | static u16_t
|
---|
1011 | tcp_new_port(void)
|
---|
1012 | {
|
---|
1013 | u8_t i;
|
---|
1014 | u16_t n = 0;
|
---|
1015 | struct tcp_pcb *pcb;
|
---|
1016 |
|
---|
1017 | again:
|
---|
1018 | tcp_port++;
|
---|
1019 | if (tcp_port == TCP_LOCAL_PORT_RANGE_END) {
|
---|
1020 | tcp_port = TCP_LOCAL_PORT_RANGE_START;
|
---|
1021 | }
|
---|
1022 | /* Check all PCB lists. */
|
---|
1023 | for (i = 0; i < NUM_TCP_PCB_LISTS; i++) {
|
---|
1024 | for (pcb = *tcp_pcb_lists[i]; pcb != NULL; pcb = pcb->next) {
|
---|
1025 | if (pcb->local_port == tcp_port) {
|
---|
1026 | n++;
|
---|
1027 | if (n > (TCP_LOCAL_PORT_RANGE_END - TCP_LOCAL_PORT_RANGE_START)) {
|
---|
1028 | return 0;
|
---|
1029 | }
|
---|
1030 | goto again;
|
---|
1031 | }
|
---|
1032 | }
|
---|
1033 | }
|
---|
1034 | return tcp_port;
|
---|
1035 | }
|
---|
1036 |
|
---|
1037 | /**
|
---|
1038 | * @ingroup tcp_raw
|
---|
1039 | * Connects to another host. The function given as the "connected"
|
---|
1040 | * argument will be called when the connection has been established.
|
---|
1041 | * Sets up the pcb to connect to the remote host and sends the
|
---|
1042 | * initial SYN segment which opens the connection.
|
---|
1043 | *
|
---|
1044 | * The tcp_connect() function returns immediately; it does not wait for
|
---|
1045 | * the connection to be properly setup. Instead, it will call the
|
---|
1046 | * function specified as the fourth argument (the "connected" argument)
|
---|
1047 | * when the connection is established. If the connection could not be
|
---|
1048 | * properly established, either because the other host refused the
|
---|
1049 | * connection or because the other host didn't answer, the "err"
|
---|
1050 | * callback function of this pcb (registered with tcp_err, see below)
|
---|
1051 | * will be called.
|
---|
1052 | *
|
---|
1053 | * The tcp_connect() function can return ERR_MEM if no memory is
|
---|
1054 | * available for enqueueing the SYN segment. If the SYN indeed was
|
---|
1055 | * enqueued successfully, the tcp_connect() function returns ERR_OK.
|
---|
1056 | *
|
---|
1057 | * @param pcb the tcp_pcb used to establish the connection
|
---|
1058 | * @param ipaddr the remote ip address to connect to
|
---|
1059 | * @param port the remote tcp port to connect to
|
---|
1060 | * @param connected callback function to call when connected (on error,
|
---|
1061 | the err calback will be called)
|
---|
1062 | * @return ERR_VAL if invalid arguments are given
|
---|
1063 | * ERR_OK if connect request has been sent
|
---|
1064 | * other err_t values if connect request couldn't be sent
|
---|
1065 | */
|
---|
1066 | err_t
|
---|
1067 | tcp_connect(struct tcp_pcb *pcb, const ip_addr_t *ipaddr, u16_t port,
|
---|
1068 | tcp_connected_fn connected)
|
---|
1069 | {
|
---|
1070 | struct netif *netif = NULL;
|
---|
1071 | err_t ret;
|
---|
1072 | u32_t iss;
|
---|
1073 | u16_t old_local_port;
|
---|
1074 |
|
---|
1075 | LWIP_ASSERT_CORE_LOCKED();
|
---|
1076 |
|
---|
1077 | LWIP_ERROR("tcp_connect: invalid pcb", pcb != NULL, return ERR_ARG);
|
---|
1078 | LWIP_ERROR("tcp_connect: invalid ipaddr", ipaddr != NULL, return ERR_ARG);
|
---|
1079 |
|
---|
1080 | LWIP_ERROR("tcp_connect: can only connect from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
|
---|
1081 |
|
---|
1082 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
|
---|
1083 | ip_addr_set(&pcb->remote_ip, ipaddr);
|
---|
1084 | pcb->remote_port = port;
|
---|
1085 |
|
---|
1086 | if (pcb->netif_idx != NETIF_NO_INDEX) {
|
---|
1087 | netif = netif_get_by_index(pcb->netif_idx);
|
---|
1088 | } else {
|
---|
1089 | /* check if we have a route to the remote host */
|
---|
1090 | netif = ip_route(&pcb->local_ip, &pcb->remote_ip);
|
---|
1091 | }
|
---|
1092 | if (netif == NULL) {
|
---|
1093 | /* Don't even try to send a SYN packet if we have no route since that will fail. */
|
---|
1094 | return ERR_RTE;
|
---|
1095 | }
|
---|
1096 |
|
---|
1097 | /* check if local IP has been assigned to pcb, if not, get one */
|
---|
1098 | if (ip_addr_isany(&pcb->local_ip)) {
|
---|
1099 | const ip_addr_t *local_ip = ip_netif_get_local_ip(netif, ipaddr);
|
---|
1100 | if (local_ip == NULL) {
|
---|
1101 | return ERR_RTE;
|
---|
1102 | }
|
---|
1103 | ip_addr_copy(pcb->local_ip, *local_ip);
|
---|
1104 | }
|
---|
1105 |
|
---|
1106 | #if LWIP_IPV6 && LWIP_IPV6_SCOPES
|
---|
1107 | /* If the given IP address should have a zone but doesn't, assign one now.
|
---|
1108 | * Given that we already have the target netif, this is easy and cheap. */
|
---|
1109 | if (IP_IS_V6(&pcb->remote_ip) &&
|
---|
1110 | ip6_addr_lacks_zone(ip_2_ip6(&pcb->remote_ip), IP6_UNICAST)) {
|
---|
1111 | ip6_addr_assign_zone(ip_2_ip6(&pcb->remote_ip), IP6_UNICAST, netif);
|
---|
1112 | }
|
---|
1113 | #endif /* LWIP_IPV6 && LWIP_IPV6_SCOPES */
|
---|
1114 |
|
---|
1115 | old_local_port = pcb->local_port;
|
---|
1116 | if (pcb->local_port == 0) {
|
---|
1117 | pcb->local_port = tcp_new_port();
|
---|
1118 | if (pcb->local_port == 0) {
|
---|
1119 | return ERR_BUF;
|
---|
1120 | }
|
---|
1121 | } else {
|
---|
1122 | #if SO_REUSE
|
---|
1123 | if (ip_get_option(pcb, SOF_REUSEADDR)) {
|
---|
1124 | /* Since SOF_REUSEADDR allows reusing a local address, we have to make sure
|
---|
1125 | now that the 5-tuple is unique. */
|
---|
1126 | struct tcp_pcb *cpcb;
|
---|
1127 | int i;
|
---|
1128 | /* Don't check listen- and bound-PCBs, check active- and TIME-WAIT PCBs. */
|
---|
1129 | for (i = 2; i < NUM_TCP_PCB_LISTS; i++) {
|
---|
1130 | for (cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
|
---|
1131 | if ((cpcb->local_port == pcb->local_port) &&
|
---|
1132 | (cpcb->remote_port == port) &&
|
---|
1133 | ip_addr_cmp(&cpcb->local_ip, &pcb->local_ip) &&
|
---|
1134 | ip_addr_cmp(&cpcb->remote_ip, ipaddr)) {
|
---|
1135 | /* linux returns EISCONN here, but ERR_USE should be OK for us */
|
---|
1136 | return ERR_USE;
|
---|
1137 | }
|
---|
1138 | }
|
---|
1139 | }
|
---|
1140 | }
|
---|
1141 | #endif /* SO_REUSE */
|
---|
1142 | }
|
---|
1143 |
|
---|
1144 | iss = tcp_next_iss(pcb);
|
---|
1145 | pcb->rcv_nxt = 0;
|
---|
1146 | pcb->snd_nxt = iss;
|
---|
1147 | pcb->lastack = iss - 1;
|
---|
1148 | pcb->snd_wl2 = iss - 1;
|
---|
1149 | pcb->snd_lbb = iss - 1;
|
---|
1150 | /* Start with a window that does not need scaling. When window scaling is
|
---|
1151 | enabled and used, the window is enlarged when both sides agree on scaling. */
|
---|
1152 | pcb->rcv_wnd = pcb->rcv_ann_wnd = TCPWND_MIN16(TCP_WND);
|
---|
1153 | pcb->rcv_ann_right_edge = pcb->rcv_nxt;
|
---|
1154 | pcb->snd_wnd = TCP_WND;
|
---|
1155 | /* As initial send MSS, we use TCP_MSS but limit it to 536.
|
---|
1156 | The send MSS is updated when an MSS option is received. */
|
---|
1157 | pcb->mss = INITIAL_MSS;
|
---|
1158 | #if TCP_CALCULATE_EFF_SEND_MSS
|
---|
1159 | pcb->mss = tcp_eff_send_mss_netif(pcb->mss, netif, &pcb->remote_ip);
|
---|
1160 | #endif /* TCP_CALCULATE_EFF_SEND_MSS */
|
---|
1161 | pcb->cwnd = 1;
|
---|
1162 | #if LWIP_CALLBACK_API
|
---|
1163 | pcb->connected = connected;
|
---|
1164 | #else /* LWIP_CALLBACK_API */
|
---|
1165 | LWIP_UNUSED_ARG(connected);
|
---|
1166 | #endif /* LWIP_CALLBACK_API */
|
---|
1167 |
|
---|
1168 | /* Send a SYN together with the MSS option. */
|
---|
1169 | ret = tcp_enqueue_flags(pcb, TCP_SYN);
|
---|
1170 | if (ret == ERR_OK) {
|
---|
1171 | /* SYN segment was enqueued, changed the pcbs state now */
|
---|
1172 | pcb->state = SYN_SENT;
|
---|
1173 | if (old_local_port != 0) {
|
---|
1174 | TCP_RMV(&tcp_bound_pcbs, pcb);
|
---|
1175 | }
|
---|
1176 | TCP_REG_ACTIVE(pcb);
|
---|
1177 | MIB2_STATS_INC(mib2.tcpactiveopens);
|
---|
1178 |
|
---|
1179 | tcp_output(pcb);
|
---|
1180 | }
|
---|
1181 | return ret;
|
---|
1182 | }
|
---|
1183 |
|
---|
1184 | /**
|
---|
1185 | * Called every 500 ms and implements the retransmission timer and the timer that
|
---|
1186 | * removes PCBs that have been in TIME-WAIT for enough time. It also increments
|
---|
1187 | * various timers such as the inactivity timer in each PCB.
|
---|
1188 | *
|
---|
1189 | * Automatically called from tcp_tmr().
|
---|
1190 | */
|
---|
1191 | void
|
---|
1192 | tcp_slowtmr(void)
|
---|
1193 | {
|
---|
1194 | struct tcp_pcb *pcb, *prev;
|
---|
1195 | tcpwnd_size_t eff_wnd;
|
---|
1196 | u8_t pcb_remove; /* flag if a PCB should be removed */
|
---|
1197 | u8_t pcb_reset; /* flag if a RST should be sent when removing */
|
---|
1198 | err_t err;
|
---|
1199 |
|
---|
1200 | err = ERR_OK;
|
---|
1201 |
|
---|
1202 | ++tcp_ticks;
|
---|
1203 | ++tcp_timer_ctr;
|
---|
1204 |
|
---|
1205 | tcp_slowtmr_start:
|
---|
1206 | /* Steps through all of the active PCBs. */
|
---|
1207 | prev = NULL;
|
---|
1208 | pcb = tcp_active_pcbs;
|
---|
1209 | if (pcb == NULL) {
|
---|
1210 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
|
---|
1211 | }
|
---|
1212 | while (pcb != NULL) {
|
---|
1213 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
|
---|
1214 | LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
|
---|
1215 | LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
|
---|
1216 | LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
|
---|
1217 | if (pcb->last_timer == tcp_timer_ctr) {
|
---|
1218 | /* skip this pcb, we have already processed it */
|
---|
1219 | prev = pcb;
|
---|
1220 | pcb = pcb->next;
|
---|
1221 | continue;
|
---|
1222 | }
|
---|
1223 | pcb->last_timer = tcp_timer_ctr;
|
---|
1224 |
|
---|
1225 | pcb_remove = 0;
|
---|
1226 | pcb_reset = 0;
|
---|
1227 |
|
---|
1228 | if (pcb->state == SYN_SENT && pcb->nrtx >= TCP_SYNMAXRTX) {
|
---|
1229 | ++pcb_remove;
|
---|
1230 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
|
---|
1231 | } else if (pcb->nrtx >= TCP_MAXRTX) {
|
---|
1232 | ++pcb_remove;
|
---|
1233 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
|
---|
1234 | } else {
|
---|
1235 | if (pcb->persist_backoff > 0) {
|
---|
1236 | LWIP_ASSERT("tcp_slowtimr: persist ticking with in-flight data", pcb->unacked == NULL);
|
---|
1237 | LWIP_ASSERT("tcp_slowtimr: persist ticking with empty send buffer", pcb->unsent != NULL);
|
---|
1238 | if (pcb->persist_probe >= TCP_MAXRTX) {
|
---|
1239 | ++pcb_remove; /* max probes reached */
|
---|
1240 | } else {
|
---|
1241 | u8_t backoff_cnt = tcp_persist_backoff[pcb->persist_backoff - 1];
|
---|
1242 | if (pcb->persist_cnt < backoff_cnt) {
|
---|
1243 | pcb->persist_cnt++;
|
---|
1244 | }
|
---|
1245 | if (pcb->persist_cnt >= backoff_cnt) {
|
---|
1246 | int next_slot = 1; /* increment timer to next slot */
|
---|
1247 | /* If snd_wnd is zero, send 1 byte probes */
|
---|
1248 | if (pcb->snd_wnd == 0) {
|
---|
1249 | if (tcp_zero_window_probe(pcb) != ERR_OK) {
|
---|
1250 | next_slot = 0; /* try probe again with current slot */
|
---|
1251 | }
|
---|
1252 | /* snd_wnd not fully closed, split unsent head and fill window */
|
---|
1253 | } else {
|
---|
1254 | if (tcp_split_unsent_seg(pcb, (u16_t)pcb->snd_wnd) == ERR_OK) {
|
---|
1255 | if (tcp_output(pcb) == ERR_OK) {
|
---|
1256 | /* sending will cancel persist timer, else retry with current slot */
|
---|
1257 | next_slot = 0;
|
---|
1258 | }
|
---|
1259 | }
|
---|
1260 | }
|
---|
1261 | if (next_slot) {
|
---|
1262 | pcb->persist_cnt = 0;
|
---|
1263 | if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
|
---|
1264 | pcb->persist_backoff++;
|
---|
1265 | }
|
---|
1266 | }
|
---|
1267 | }
|
---|
1268 | }
|
---|
1269 | } else {
|
---|
1270 | /* Increase the retransmission timer if it is running */
|
---|
1271 | if ((pcb->rtime >= 0) && (pcb->rtime < 0x7FFF)) {
|
---|
1272 | ++pcb->rtime;
|
---|
1273 | }
|
---|
1274 |
|
---|
1275 | if (pcb->rtime >= pcb->rto) {
|
---|
1276 | /* Time for a retransmission. */
|
---|
1277 | LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
|
---|
1278 | " pcb->rto %"S16_F"\n",
|
---|
1279 | pcb->rtime, pcb->rto));
|
---|
1280 | /* If prepare phase fails but we have unsent data but no unacked data,
|
---|
1281 | still execute the backoff calculations below, as this means we somehow
|
---|
1282 | failed to send segment. */
|
---|
1283 | if ((tcp_rexmit_rto_prepare(pcb) == ERR_OK) || ((pcb->unacked == NULL) && (pcb->unsent != NULL))) {
|
---|
1284 | /* Double retransmission time-out unless we are trying to
|
---|
1285 | * connect to somebody (i.e., we are in SYN_SENT). */
|
---|
1286 | if (pcb->state != SYN_SENT) {
|
---|
1287 | u8_t backoff_idx = LWIP_MIN(pcb->nrtx, sizeof(tcp_backoff) - 1);
|
---|
1288 | int calc_rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[backoff_idx];
|
---|
1289 | pcb->rto = (s16_t)LWIP_MIN(calc_rto, 0x7FFF);
|
---|
1290 | }
|
---|
1291 |
|
---|
1292 | /* Reset the retransmission timer. */
|
---|
1293 | pcb->rtime = 0;
|
---|
1294 |
|
---|
1295 | /* Reduce congestion window and ssthresh. */
|
---|
1296 | eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
|
---|
1297 | pcb->ssthresh = eff_wnd >> 1;
|
---|
1298 | if (pcb->ssthresh < (tcpwnd_size_t)(pcb->mss << 1)) {
|
---|
1299 | pcb->ssthresh = (tcpwnd_size_t)(pcb->mss << 1);
|
---|
1300 | }
|
---|
1301 | pcb->cwnd = pcb->mss;
|
---|
1302 | LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"TCPWNDSIZE_F
|
---|
1303 | " ssthresh %"TCPWNDSIZE_F"\n",
|
---|
1304 | pcb->cwnd, pcb->ssthresh));
|
---|
1305 | pcb->bytes_acked = 0;
|
---|
1306 |
|
---|
1307 | /* The following needs to be called AFTER cwnd is set to one
|
---|
1308 | mss - STJ */
|
---|
1309 | tcp_rexmit_rto_commit(pcb);
|
---|
1310 | }
|
---|
1311 | }
|
---|
1312 | }
|
---|
1313 | }
|
---|
1314 | /* Check if this PCB has stayed too long in FIN-WAIT-2 */
|
---|
1315 | if (pcb->state == FIN_WAIT_2) {
|
---|
1316 | /* If this PCB is in FIN_WAIT_2 because of SHUT_WR don't let it time out. */
|
---|
1317 | if (pcb->flags & TF_RXCLOSED) {
|
---|
1318 | /* PCB was fully closed (either through close() or SHUT_RDWR):
|
---|
1319 | normal FIN-WAIT timeout handling. */
|
---|
1320 | if ((u32_t)(tcp_ticks - pcb->tmr) >
|
---|
1321 | TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
|
---|
1322 | ++pcb_remove;
|
---|
1323 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
|
---|
1324 | }
|
---|
1325 | }
|
---|
1326 | }
|
---|
1327 |
|
---|
1328 | /* Check if KEEPALIVE should be sent */
|
---|
1329 | if (ip_get_option(pcb, SOF_KEEPALIVE) &&
|
---|
1330 | ((pcb->state == ESTABLISHED) ||
|
---|
1331 | (pcb->state == CLOSE_WAIT))) {
|
---|
1332 | if ((u32_t)(tcp_ticks - pcb->tmr) >
|
---|
1333 | (pcb->keep_idle + TCP_KEEP_DUR(pcb)) / TCP_SLOW_INTERVAL) {
|
---|
1334 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to "));
|
---|
1335 | ip_addr_debug_print_val(TCP_DEBUG, pcb->remote_ip);
|
---|
1336 | LWIP_DEBUGF(TCP_DEBUG, ("\n"));
|
---|
1337 |
|
---|
1338 | ++pcb_remove;
|
---|
1339 | ++pcb_reset;
|
---|
1340 | } else if ((u32_t)(tcp_ticks - pcb->tmr) >
|
---|
1341 | (pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEP_INTVL(pcb))
|
---|
1342 | / TCP_SLOW_INTERVAL) {
|
---|
1343 | err = tcp_keepalive(pcb);
|
---|
1344 | if (err == ERR_OK) {
|
---|
1345 | pcb->keep_cnt_sent++;
|
---|
1346 | }
|
---|
1347 | }
|
---|
1348 | }
|
---|
1349 |
|
---|
1350 | /* If this PCB has queued out of sequence data, but has been
|
---|
1351 | inactive for too long, will drop the data (it will eventually
|
---|
1352 | be retransmitted). */
|
---|
1353 | #if TCP_QUEUE_OOSEQ
|
---|
1354 | if (pcb->ooseq != NULL &&
|
---|
1355 | (tcp_ticks - pcb->tmr >= (u32_t)pcb->rto * TCP_OOSEQ_TIMEOUT)) {
|
---|
1356 | LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
|
---|
1357 | tcp_free_ooseq(pcb);
|
---|
1358 | }
|
---|
1359 | #endif /* TCP_QUEUE_OOSEQ */
|
---|
1360 |
|
---|
1361 | /* Check if this PCB has stayed too long in SYN-RCVD */
|
---|
1362 | if (pcb->state == SYN_RCVD) {
|
---|
1363 | if ((u32_t)(tcp_ticks - pcb->tmr) >
|
---|
1364 | TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
|
---|
1365 | ++pcb_remove;
|
---|
1366 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
|
---|
1367 | }
|
---|
1368 | }
|
---|
1369 |
|
---|
1370 | /* Check if this PCB has stayed too long in LAST-ACK */
|
---|
1371 | if (pcb->state == LAST_ACK) {
|
---|
1372 | if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
|
---|
1373 | ++pcb_remove;
|
---|
1374 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
|
---|
1375 | }
|
---|
1376 | }
|
---|
1377 |
|
---|
1378 | /* If the PCB should be removed, do it. */
|
---|
1379 | if (pcb_remove) {
|
---|
1380 | struct tcp_pcb *pcb2;
|
---|
1381 | #if LWIP_CALLBACK_API
|
---|
1382 | tcp_err_fn err_fn = pcb->errf;
|
---|
1383 | #endif /* LWIP_CALLBACK_API */
|
---|
1384 | void *err_arg;
|
---|
1385 | enum tcp_state last_state;
|
---|
1386 | tcp_pcb_purge(pcb);
|
---|
1387 | /* Remove PCB from tcp_active_pcbs list. */
|
---|
1388 | if (prev != NULL) {
|
---|
1389 | LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
|
---|
1390 | prev->next = pcb->next;
|
---|
1391 | } else {
|
---|
1392 | /* This PCB was the first. */
|
---|
1393 | LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
|
---|
1394 | tcp_active_pcbs = pcb->next;
|
---|
1395 | }
|
---|
1396 |
|
---|
1397 | if (pcb_reset) {
|
---|
1398 | tcp_rst(pcb, pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
|
---|
1399 | pcb->local_port, pcb->remote_port);
|
---|
1400 | }
|
---|
1401 |
|
---|
1402 | err_arg = pcb->callback_arg;
|
---|
1403 | last_state = pcb->state;
|
---|
1404 | pcb2 = pcb;
|
---|
1405 | pcb = pcb->next;
|
---|
1406 | tcp_free(pcb2);
|
---|
1407 |
|
---|
1408 | tcp_active_pcbs_changed = 0;
|
---|
1409 | TCP_EVENT_ERR(last_state, err_fn, err_arg, ERR_ABRT);
|
---|
1410 | if (tcp_active_pcbs_changed) {
|
---|
1411 | goto tcp_slowtmr_start;
|
---|
1412 | }
|
---|
1413 | } else {
|
---|
1414 | /* get the 'next' element now and work with 'prev' below (in case of abort) */
|
---|
1415 | prev = pcb;
|
---|
1416 | pcb = pcb->next;
|
---|
1417 |
|
---|
1418 | /* We check if we should poll the connection. */
|
---|
1419 | ++prev->polltmr;
|
---|
1420 | if (prev->polltmr >= prev->pollinterval) {
|
---|
1421 | prev->polltmr = 0;
|
---|
1422 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
|
---|
1423 | tcp_active_pcbs_changed = 0;
|
---|
1424 | TCP_EVENT_POLL(prev, err);
|
---|
1425 | if (tcp_active_pcbs_changed) {
|
---|
1426 | goto tcp_slowtmr_start;
|
---|
1427 | }
|
---|
1428 | /* if err == ERR_ABRT, 'prev' is already deallocated */
|
---|
1429 | if (err == ERR_OK) {
|
---|
1430 | tcp_output(prev);
|
---|
1431 | }
|
---|
1432 | }
|
---|
1433 | }
|
---|
1434 | }
|
---|
1435 |
|
---|
1436 |
|
---|
1437 | /* Steps through all of the TIME-WAIT PCBs. */
|
---|
1438 | prev = NULL;
|
---|
1439 | pcb = tcp_tw_pcbs;
|
---|
1440 | while (pcb != NULL) {
|
---|
1441 | LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
|
---|
1442 | pcb_remove = 0;
|
---|
1443 |
|
---|
1444 | /* Check if this PCB has stayed long enough in TIME-WAIT */
|
---|
1445 | if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
|
---|
1446 | ++pcb_remove;
|
---|
1447 | }
|
---|
1448 |
|
---|
1449 | /* If the PCB should be removed, do it. */
|
---|
1450 | if (pcb_remove) {
|
---|
1451 | struct tcp_pcb *pcb2;
|
---|
1452 | tcp_pcb_purge(pcb);
|
---|
1453 | /* Remove PCB from tcp_tw_pcbs list. */
|
---|
1454 | if (prev != NULL) {
|
---|
1455 | LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
|
---|
1456 | prev->next = pcb->next;
|
---|
1457 | } else {
|
---|
1458 | /* This PCB was the first. */
|
---|
1459 | LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
|
---|
1460 | tcp_tw_pcbs = pcb->next;
|
---|
1461 | }
|
---|
1462 | pcb2 = pcb;
|
---|
1463 | pcb = pcb->next;
|
---|
1464 | tcp_free(pcb2);
|
---|
1465 | } else {
|
---|
1466 | prev = pcb;
|
---|
1467 | pcb = pcb->next;
|
---|
1468 | }
|
---|
1469 | }
|
---|
1470 | }
|
---|
1471 |
|
---|
1472 | /**
|
---|
1473 | * Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
|
---|
1474 | * "refused" by upper layer (application) and sends delayed ACKs or pending FINs.
|
---|
1475 | *
|
---|
1476 | * Automatically called from tcp_tmr().
|
---|
1477 | */
|
---|
1478 | void
|
---|
1479 | tcp_fasttmr(void)
|
---|
1480 | {
|
---|
1481 | struct tcp_pcb *pcb;
|
---|
1482 |
|
---|
1483 | ++tcp_timer_ctr;
|
---|
1484 |
|
---|
1485 | tcp_fasttmr_start:
|
---|
1486 | pcb = tcp_active_pcbs;
|
---|
1487 |
|
---|
1488 | while (pcb != NULL) {
|
---|
1489 | if (pcb->last_timer != tcp_timer_ctr) {
|
---|
1490 | struct tcp_pcb *next;
|
---|
1491 | pcb->last_timer = tcp_timer_ctr;
|
---|
1492 | /* send delayed ACKs */
|
---|
1493 | if (pcb->flags & TF_ACK_DELAY) {
|
---|
1494 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
|
---|
1495 | tcp_ack_now(pcb);
|
---|
1496 | tcp_output(pcb);
|
---|
1497 | tcp_clear_flags(pcb, TF_ACK_DELAY | TF_ACK_NOW);
|
---|
1498 | }
|
---|
1499 | /* send pending FIN */
|
---|
1500 | if (pcb->flags & TF_CLOSEPEND) {
|
---|
1501 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: pending FIN\n"));
|
---|
1502 | tcp_clear_flags(pcb, TF_CLOSEPEND);
|
---|
1503 | tcp_close_shutdown_fin(pcb);
|
---|
1504 | }
|
---|
1505 |
|
---|
1506 | next = pcb->next;
|
---|
1507 |
|
---|
1508 | /* If there is data which was previously "refused" by upper layer */
|
---|
1509 | if (pcb->refused_data != NULL) {
|
---|
1510 | tcp_active_pcbs_changed = 0;
|
---|
1511 | tcp_process_refused_data(pcb);
|
---|
1512 | if (tcp_active_pcbs_changed) {
|
---|
1513 | /* application callback has changed the pcb list: restart the loop */
|
---|
1514 | goto tcp_fasttmr_start;
|
---|
1515 | }
|
---|
1516 | }
|
---|
1517 | pcb = next;
|
---|
1518 | } else {
|
---|
1519 | pcb = pcb->next;
|
---|
1520 | }
|
---|
1521 | }
|
---|
1522 | }
|
---|
1523 |
|
---|
1524 | /** Call tcp_output for all active pcbs that have TF_NAGLEMEMERR set */
|
---|
1525 | void
|
---|
1526 | tcp_txnow(void)
|
---|
1527 | {
|
---|
1528 | struct tcp_pcb *pcb;
|
---|
1529 |
|
---|
1530 | for (pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
|
---|
1531 | if (pcb->flags & TF_NAGLEMEMERR) {
|
---|
1532 | tcp_output(pcb);
|
---|
1533 | }
|
---|
1534 | }
|
---|
1535 | }
|
---|
1536 |
|
---|
1537 | /** Pass pcb->refused_data to the recv callback */
|
---|
1538 | err_t
|
---|
1539 | tcp_process_refused_data(struct tcp_pcb *pcb)
|
---|
1540 | {
|
---|
1541 | #if TCP_QUEUE_OOSEQ && LWIP_WND_SCALE
|
---|
1542 | struct pbuf *rest;
|
---|
1543 | #endif /* TCP_QUEUE_OOSEQ && LWIP_WND_SCALE */
|
---|
1544 |
|
---|
1545 | LWIP_ERROR("tcp_process_refused_data: invalid pcb", pcb != NULL, return ERR_ARG);
|
---|
1546 |
|
---|
1547 | #if TCP_QUEUE_OOSEQ && LWIP_WND_SCALE
|
---|
1548 | while (pcb->refused_data != NULL)
|
---|
1549 | #endif /* TCP_QUEUE_OOSEQ && LWIP_WND_SCALE */
|
---|
1550 | {
|
---|
1551 | err_t err;
|
---|
1552 | u8_t refused_flags = pcb->refused_data->flags;
|
---|
1553 | /* set pcb->refused_data to NULL in case the callback frees it and then
|
---|
1554 | closes the pcb */
|
---|
1555 | struct pbuf *refused_data = pcb->refused_data;
|
---|
1556 | #if TCP_QUEUE_OOSEQ && LWIP_WND_SCALE
|
---|
1557 | pbuf_split_64k(refused_data, &rest);
|
---|
1558 | pcb->refused_data = rest;
|
---|
1559 | #else /* TCP_QUEUE_OOSEQ && LWIP_WND_SCALE */
|
---|
1560 | pcb->refused_data = NULL;
|
---|
1561 | #endif /* TCP_QUEUE_OOSEQ && LWIP_WND_SCALE */
|
---|
1562 | /* Notify again application with data previously received. */
|
---|
1563 | LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: notify kept packet\n"));
|
---|
1564 | TCP_EVENT_RECV(pcb, refused_data, ERR_OK, err);
|
---|
1565 | if (err == ERR_OK) {
|
---|
1566 | /* did refused_data include a FIN? */
|
---|
1567 | if ((refused_flags & PBUF_FLAG_TCP_FIN)
|
---|
1568 | #if TCP_QUEUE_OOSEQ && LWIP_WND_SCALE
|
---|
1569 | && (rest == NULL)
|
---|
1570 | #endif /* TCP_QUEUE_OOSEQ && LWIP_WND_SCALE */
|
---|
1571 | ) {
|
---|
1572 | /* correct rcv_wnd as the application won't call tcp_recved()
|
---|
1573 | for the FIN's seqno */
|
---|
1574 | if (pcb->rcv_wnd != TCP_WND_MAX(pcb)) {
|
---|
1575 | pcb->rcv_wnd++;
|
---|
1576 | }
|
---|
1577 | TCP_EVENT_CLOSED(pcb, err);
|
---|
1578 | if (err == ERR_ABRT) {
|
---|
1579 | return ERR_ABRT;
|
---|
1580 | }
|
---|
1581 | }
|
---|
1582 | } else if (err == ERR_ABRT) {
|
---|
1583 | /* if err == ERR_ABRT, 'pcb' is already deallocated */
|
---|
1584 | /* Drop incoming packets because pcb is "full" (only if the incoming
|
---|
1585 | segment contains data). */
|
---|
1586 | LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: drop incoming packets, because pcb is \"full\"\n"));
|
---|
1587 | return ERR_ABRT;
|
---|
1588 | } else {
|
---|
1589 | /* data is still refused, pbuf is still valid (go on for ACK-only packets) */
|
---|
1590 | #if TCP_QUEUE_OOSEQ && LWIP_WND_SCALE
|
---|
1591 | if (rest != NULL) {
|
---|
1592 | pbuf_cat(refused_data, rest);
|
---|
1593 | }
|
---|
1594 | #endif /* TCP_QUEUE_OOSEQ && LWIP_WND_SCALE */
|
---|
1595 | pcb->refused_data = refused_data;
|
---|
1596 | return ERR_INPROGRESS;
|
---|
1597 | }
|
---|
1598 | }
|
---|
1599 | return ERR_OK;
|
---|
1600 | }
|
---|
1601 |
|
---|
1602 | /**
|
---|
1603 | * Deallocates a list of TCP segments (tcp_seg structures).
|
---|
1604 | *
|
---|
1605 | * @param seg tcp_seg list of TCP segments to free
|
---|
1606 | */
|
---|
1607 | void
|
---|
1608 | tcp_segs_free(struct tcp_seg *seg)
|
---|
1609 | {
|
---|
1610 | while (seg != NULL) {
|
---|
1611 | struct tcp_seg *next = seg->next;
|
---|
1612 | tcp_seg_free(seg);
|
---|
1613 | seg = next;
|
---|
1614 | }
|
---|
1615 | }
|
---|
1616 |
|
---|
1617 | /**
|
---|
1618 | * Frees a TCP segment (tcp_seg structure).
|
---|
1619 | *
|
---|
1620 | * @param seg single tcp_seg to free
|
---|
1621 | */
|
---|
1622 | void
|
---|
1623 | tcp_seg_free(struct tcp_seg *seg)
|
---|
1624 | {
|
---|
1625 | if (seg != NULL) {
|
---|
1626 | if (seg->p != NULL) {
|
---|
1627 | pbuf_free(seg->p);
|
---|
1628 | #if TCP_DEBUG
|
---|
1629 | seg->p = NULL;
|
---|
1630 | #endif /* TCP_DEBUG */
|
---|
1631 | }
|
---|
1632 | memp_free(MEMP_TCP_SEG, seg);
|
---|
1633 | }
|
---|
1634 | }
|
---|
1635 |
|
---|
1636 | /**
|
---|
1637 | * @ingroup tcp
|
---|
1638 | * Sets the priority of a connection.
|
---|
1639 | *
|
---|
1640 | * @param pcb the tcp_pcb to manipulate
|
---|
1641 | * @param prio new priority
|
---|
1642 | */
|
---|
1643 | void
|
---|
1644 | tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
|
---|
1645 | {
|
---|
1646 | LWIP_ASSERT_CORE_LOCKED();
|
---|
1647 |
|
---|
1648 | LWIP_ERROR("tcp_setprio: invalid pcb", pcb != NULL, return);
|
---|
1649 |
|
---|
1650 | pcb->prio = prio;
|
---|
1651 | }
|
---|
1652 |
|
---|
1653 | #if TCP_QUEUE_OOSEQ
|
---|
1654 | /**
|
---|
1655 | * Returns a copy of the given TCP segment.
|
---|
1656 | * The pbuf and data are not copied, only the pointers
|
---|
1657 | *
|
---|
1658 | * @param seg the old tcp_seg
|
---|
1659 | * @return a copy of seg
|
---|
1660 | */
|
---|
1661 | struct tcp_seg *
|
---|
1662 | tcp_seg_copy(struct tcp_seg *seg)
|
---|
1663 | {
|
---|
1664 | struct tcp_seg *cseg;
|
---|
1665 |
|
---|
1666 | LWIP_ASSERT("tcp_seg_copy: invalid seg", seg != NULL);
|
---|
1667 |
|
---|
1668 | cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG);
|
---|
1669 | if (cseg == NULL) {
|
---|
1670 | return NULL;
|
---|
1671 | }
|
---|
1672 | SMEMCPY((u8_t *)cseg, (const u8_t *)seg, sizeof(struct tcp_seg));
|
---|
1673 | pbuf_ref(cseg->p);
|
---|
1674 | return cseg;
|
---|
1675 | }
|
---|
1676 | #endif /* TCP_QUEUE_OOSEQ */
|
---|
1677 |
|
---|
1678 | #if LWIP_CALLBACK_API
|
---|
1679 | /**
|
---|
1680 | * Default receive callback that is called if the user didn't register
|
---|
1681 | * a recv callback for the pcb.
|
---|
1682 | */
|
---|
1683 | err_t
|
---|
1684 | tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
|
---|
1685 | {
|
---|
1686 | LWIP_UNUSED_ARG(arg);
|
---|
1687 |
|
---|
1688 | LWIP_ERROR("tcp_recv_null: invalid pcb", pcb != NULL, return ERR_ARG);
|
---|
1689 |
|
---|
1690 | if (p != NULL) {
|
---|
1691 | tcp_recved(pcb, p->tot_len);
|
---|
1692 | pbuf_free(p);
|
---|
1693 | } else if (err == ERR_OK) {
|
---|
1694 | return tcp_close(pcb);
|
---|
1695 | }
|
---|
1696 | return ERR_OK;
|
---|
1697 | }
|
---|
1698 | #endif /* LWIP_CALLBACK_API */
|
---|
1699 |
|
---|
1700 | /**
|
---|
1701 | * Kills the oldest active connection that has a lower priority than 'prio'.
|
---|
1702 | *
|
---|
1703 | * @param prio minimum priority
|
---|
1704 | */
|
---|
1705 | static void
|
---|
1706 | tcp_kill_prio(u8_t prio)
|
---|
1707 | {
|
---|
1708 | struct tcp_pcb *pcb, *inactive;
|
---|
1709 | u32_t inactivity;
|
---|
1710 | u8_t mprio;
|
---|
1711 |
|
---|
1712 | mprio = LWIP_MIN(TCP_PRIO_MAX, prio);
|
---|
1713 |
|
---|
1714 | /* We want to kill connections with a lower prio, so bail out if
|
---|
1715 | * supplied prio is 0 - there can never be a lower prio
|
---|
1716 | */
|
---|
1717 | if (mprio == 0) {
|
---|
1718 | return;
|
---|
1719 | }
|
---|
1720 |
|
---|
1721 | /* We only want kill connections with a lower prio, so decrement prio by one
|
---|
1722 | * and start searching for oldest connection with same or lower priority than mprio.
|
---|
1723 | * We want to find the connections with the lowest possible prio, and among
|
---|
1724 | * these the one with the longest inactivity time.
|
---|
1725 | */
|
---|
1726 | mprio--;
|
---|
1727 |
|
---|
1728 | inactivity = 0;
|
---|
1729 | inactive = NULL;
|
---|
1730 | for (pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
|
---|
1731 | /* lower prio is always a kill candidate */
|
---|
1732 | if ((pcb->prio < mprio) ||
|
---|
1733 | /* longer inactivity is also a kill candidate */
|
---|
1734 | ((pcb->prio == mprio) && ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity))) {
|
---|
1735 | inactivity = tcp_ticks - pcb->tmr;
|
---|
1736 | inactive = pcb;
|
---|
1737 | mprio = pcb->prio;
|
---|
1738 | }
|
---|
1739 | }
|
---|
1740 | if (inactive != NULL) {
|
---|
1741 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n",
|
---|
1742 | (void *)inactive, inactivity));
|
---|
1743 | tcp_abort(inactive);
|
---|
1744 | }
|
---|
1745 | }
|
---|
1746 |
|
---|
1747 | /**
|
---|
1748 | * Kills the oldest connection that is in specific state.
|
---|
1749 | * Called from tcp_alloc() for LAST_ACK and CLOSING if no more connections are available.
|
---|
1750 | */
|
---|
1751 | static void
|
---|
1752 | tcp_kill_state(enum tcp_state state)
|
---|
1753 | {
|
---|
1754 | struct tcp_pcb *pcb, *inactive;
|
---|
1755 | u32_t inactivity;
|
---|
1756 |
|
---|
1757 | LWIP_ASSERT("invalid state", (state == CLOSING) || (state == LAST_ACK));
|
---|
1758 |
|
---|
1759 | inactivity = 0;
|
---|
1760 | inactive = NULL;
|
---|
1761 | /* Go through the list of active pcbs and get the oldest pcb that is in state
|
---|
1762 | CLOSING/LAST_ACK. */
|
---|
1763 | for (pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
|
---|
1764 | if (pcb->state == state) {
|
---|
1765 | if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
|
---|
1766 | inactivity = tcp_ticks - pcb->tmr;
|
---|
1767 | inactive = pcb;
|
---|
1768 | }
|
---|
1769 | }
|
---|
1770 | }
|
---|
1771 | if (inactive != NULL) {
|
---|
1772 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_closing: killing oldest %s PCB %p (%"S32_F")\n",
|
---|
1773 | tcp_state_str[state], (void *)inactive, inactivity));
|
---|
1774 | /* Don't send a RST, since no data is lost. */
|
---|
1775 | tcp_abandon(inactive, 0);
|
---|
1776 | }
|
---|
1777 | }
|
---|
1778 |
|
---|
1779 | /**
|
---|
1780 | * Kills the oldest connection that is in TIME_WAIT state.
|
---|
1781 | * Called from tcp_alloc() if no more connections are available.
|
---|
1782 | */
|
---|
1783 | static void
|
---|
1784 | tcp_kill_timewait(void)
|
---|
1785 | {
|
---|
1786 | struct tcp_pcb *pcb, *inactive;
|
---|
1787 | u32_t inactivity;
|
---|
1788 |
|
---|
1789 | inactivity = 0;
|
---|
1790 | inactive = NULL;
|
---|
1791 | /* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
|
---|
1792 | for (pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
|
---|
1793 | if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
|
---|
1794 | inactivity = tcp_ticks - pcb->tmr;
|
---|
1795 | inactive = pcb;
|
---|
1796 | }
|
---|
1797 | }
|
---|
1798 | if (inactive != NULL) {
|
---|
1799 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n",
|
---|
1800 | (void *)inactive, inactivity));
|
---|
1801 | tcp_abort(inactive);
|
---|
1802 | }
|
---|
1803 | }
|
---|
1804 |
|
---|
1805 | /* Called when allocating a pcb fails.
|
---|
1806 | * In this case, we want to handle all pcbs that want to close first: if we can
|
---|
1807 | * now send the FIN (which failed before), the pcb might be in a state that is
|
---|
1808 | * OK for us to now free it.
|
---|
1809 | */
|
---|
1810 | static void
|
---|
1811 | tcp_handle_closepend(void)
|
---|
1812 | {
|
---|
1813 | struct tcp_pcb *pcb = tcp_active_pcbs;
|
---|
1814 |
|
---|
1815 | while (pcb != NULL) {
|
---|
1816 | struct tcp_pcb *next = pcb->next;
|
---|
1817 | /* send pending FIN */
|
---|
1818 | if (pcb->flags & TF_CLOSEPEND) {
|
---|
1819 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_handle_closepend: pending FIN\n"));
|
---|
1820 | tcp_clear_flags(pcb, TF_CLOSEPEND);
|
---|
1821 | tcp_close_shutdown_fin(pcb);
|
---|
1822 | }
|
---|
1823 | pcb = next;
|
---|
1824 | }
|
---|
1825 | }
|
---|
1826 |
|
---|
1827 | /**
|
---|
1828 | * Allocate a new tcp_pcb structure.
|
---|
1829 | *
|
---|
1830 | * @param prio priority for the new pcb
|
---|
1831 | * @return a new tcp_pcb that initially is in state CLOSED
|
---|
1832 | */
|
---|
1833 | struct tcp_pcb *
|
---|
1834 | tcp_alloc(u8_t prio)
|
---|
1835 | {
|
---|
1836 | struct tcp_pcb *pcb;
|
---|
1837 |
|
---|
1838 | LWIP_ASSERT_CORE_LOCKED();
|
---|
1839 |
|
---|
1840 | pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
|
---|
1841 | if (pcb == NULL) {
|
---|
1842 | /* Try to send FIN for all pcbs stuck in TF_CLOSEPEND first */
|
---|
1843 | tcp_handle_closepend();
|
---|
1844 |
|
---|
1845 | /* Try killing oldest connection in TIME-WAIT. */
|
---|
1846 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
|
---|
1847 | tcp_kill_timewait();
|
---|
1848 | /* Try to allocate a tcp_pcb again. */
|
---|
1849 | pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
|
---|
1850 | if (pcb == NULL) {
|
---|
1851 | /* Try killing oldest connection in LAST-ACK (these wouldn't go to TIME-WAIT). */
|
---|
1852 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest LAST-ACK connection\n"));
|
---|
1853 | tcp_kill_state(LAST_ACK);
|
---|
1854 | /* Try to allocate a tcp_pcb again. */
|
---|
1855 | pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
|
---|
1856 | if (pcb == NULL) {
|
---|
1857 | /* Try killing oldest connection in CLOSING. */
|
---|
1858 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest CLOSING connection\n"));
|
---|
1859 | tcp_kill_state(CLOSING);
|
---|
1860 | /* Try to allocate a tcp_pcb again. */
|
---|
1861 | pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
|
---|
1862 | if (pcb == NULL) {
|
---|
1863 | /* Try killing oldest active connection with lower priority than the new one. */
|
---|
1864 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing oldest connection with prio lower than %d\n", prio));
|
---|
1865 | tcp_kill_prio(prio);
|
---|
1866 | /* Try to allocate a tcp_pcb again. */
|
---|
1867 | pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
|
---|
1868 | if (pcb != NULL) {
|
---|
1869 | /* adjust err stats: memp_malloc failed multiple times before */
|
---|
1870 | MEMP_STATS_DEC(err, MEMP_TCP_PCB);
|
---|
1871 | }
|
---|
1872 | }
|
---|
1873 | if (pcb != NULL) {
|
---|
1874 | /* adjust err stats: memp_malloc failed multiple times before */
|
---|
1875 | MEMP_STATS_DEC(err, MEMP_TCP_PCB);
|
---|
1876 | }
|
---|
1877 | }
|
---|
1878 | if (pcb != NULL) {
|
---|
1879 | /* adjust err stats: memp_malloc failed multiple times before */
|
---|
1880 | MEMP_STATS_DEC(err, MEMP_TCP_PCB);
|
---|
1881 | }
|
---|
1882 | }
|
---|
1883 | if (pcb != NULL) {
|
---|
1884 | /* adjust err stats: memp_malloc failed above */
|
---|
1885 | MEMP_STATS_DEC(err, MEMP_TCP_PCB);
|
---|
1886 | }
|
---|
1887 | }
|
---|
1888 | if (pcb != NULL) {
|
---|
1889 | /* zero out the whole pcb, so there is no need to initialize members to zero */
|
---|
1890 | memset(pcb, 0, sizeof(struct tcp_pcb));
|
---|
1891 | pcb->prio = prio;
|
---|
1892 | pcb->snd_buf = TCP_SND_BUF;
|
---|
1893 | /* Start with a window that does not need scaling. When window scaling is
|
---|
1894 | enabled and used, the window is enlarged when both sides agree on scaling. */
|
---|
1895 | pcb->rcv_wnd = pcb->rcv_ann_wnd = TCPWND_MIN16(TCP_WND);
|
---|
1896 | pcb->ttl = TCP_TTL;
|
---|
1897 | /* As initial send MSS, we use TCP_MSS but limit it to 536.
|
---|
1898 | The send MSS is updated when an MSS option is received. */
|
---|
1899 | pcb->mss = INITIAL_MSS;
|
---|
1900 | pcb->rto = 3000 / TCP_SLOW_INTERVAL;
|
---|
1901 | pcb->sv = 3000 / TCP_SLOW_INTERVAL;
|
---|
1902 | pcb->rtime = -1;
|
---|
1903 | pcb->cwnd = 1;
|
---|
1904 | pcb->tmr = tcp_ticks;
|
---|
1905 | pcb->last_timer = tcp_timer_ctr;
|
---|
1906 |
|
---|
1907 | /* RFC 5681 recommends setting ssthresh abritrarily high and gives an example
|
---|
1908 | of using the largest advertised receive window. We've seen complications with
|
---|
1909 | receiving TCPs that use window scaling and/or window auto-tuning where the
|
---|
1910 | initial advertised window is very small and then grows rapidly once the
|
---|
1911 | connection is established. To avoid these complications, we set ssthresh to the
|
---|
1912 | largest effective cwnd (amount of in-flight data) that the sender can have. */
|
---|
1913 | pcb->ssthresh = TCP_SND_BUF;
|
---|
1914 |
|
---|
1915 | #if LWIP_CALLBACK_API
|
---|
1916 | pcb->recv = tcp_recv_null;
|
---|
1917 | #endif /* LWIP_CALLBACK_API */
|
---|
1918 |
|
---|
1919 | /* Init KEEPALIVE timer */
|
---|
1920 | pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
|
---|
1921 |
|
---|
1922 | #if LWIP_TCP_KEEPALIVE
|
---|
1923 | pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
|
---|
1924 | pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
|
---|
1925 | #endif /* LWIP_TCP_KEEPALIVE */
|
---|
1926 | }
|
---|
1927 | return pcb;
|
---|
1928 | }
|
---|
1929 |
|
---|
1930 | /**
|
---|
1931 | * @ingroup tcp_raw
|
---|
1932 | * Creates a new TCP protocol control block but doesn't place it on
|
---|
1933 | * any of the TCP PCB lists.
|
---|
1934 | * The pcb is not put on any list until binding using tcp_bind().
|
---|
1935 | * If memory is not available for creating the new pcb, NULL is returned.
|
---|
1936 | *
|
---|
1937 | * @internal: Maybe there should be a idle TCP PCB list where these
|
---|
1938 | * PCBs are put on. Port reservation using tcp_bind() is implemented but
|
---|
1939 | * allocated pcbs that are not bound can't be killed automatically if wanting
|
---|
1940 | * to allocate a pcb with higher prio (@see tcp_kill_prio())
|
---|
1941 | *
|
---|
1942 | * @return a new tcp_pcb that initially is in state CLOSED
|
---|
1943 | */
|
---|
1944 | struct tcp_pcb *
|
---|
1945 | tcp_new(void)
|
---|
1946 | {
|
---|
1947 | return tcp_alloc(TCP_PRIO_NORMAL);
|
---|
1948 | }
|
---|
1949 |
|
---|
1950 | /**
|
---|
1951 | * @ingroup tcp_raw
|
---|
1952 | * Creates a new TCP protocol control block but doesn't
|
---|
1953 | * place it on any of the TCP PCB lists.
|
---|
1954 | * The pcb is not put on any list until binding using tcp_bind().
|
---|
1955 | *
|
---|
1956 | * @param type IP address type, see @ref lwip_ip_addr_type definitions.
|
---|
1957 | * If you want to listen to IPv4 and IPv6 (dual-stack) connections,
|
---|
1958 | * supply @ref IPADDR_TYPE_ANY as argument and bind to @ref IP_ANY_TYPE.
|
---|
1959 | * @return a new tcp_pcb that initially is in state CLOSED
|
---|
1960 | */
|
---|
1961 | struct tcp_pcb *
|
---|
1962 | tcp_new_ip_type(u8_t type)
|
---|
1963 | {
|
---|
1964 | struct tcp_pcb *pcb;
|
---|
1965 | pcb = tcp_alloc(TCP_PRIO_NORMAL);
|
---|
1966 | #if LWIP_IPV4 && LWIP_IPV6
|
---|
1967 | if (pcb != NULL) {
|
---|
1968 | IP_SET_TYPE_VAL(pcb->local_ip, type);
|
---|
1969 | IP_SET_TYPE_VAL(pcb->remote_ip, type);
|
---|
1970 | }
|
---|
1971 | #else
|
---|
1972 | LWIP_UNUSED_ARG(type);
|
---|
1973 | #endif /* LWIP_IPV4 && LWIP_IPV6 */
|
---|
1974 | return pcb;
|
---|
1975 | }
|
---|
1976 |
|
---|
1977 | /**
|
---|
1978 | * @ingroup tcp_raw
|
---|
1979 | * Specifies the program specific state that should be passed to all
|
---|
1980 | * other callback functions. The "pcb" argument is the current TCP
|
---|
1981 | * connection control block, and the "arg" argument is the argument
|
---|
1982 | * that will be passed to the callbacks.
|
---|
1983 | *
|
---|
1984 | * @param pcb tcp_pcb to set the callback argument
|
---|
1985 | * @param arg void pointer argument to pass to callback functions
|
---|
1986 | */
|
---|
1987 | void
|
---|
1988 | tcp_arg(struct tcp_pcb *pcb, void *arg)
|
---|
1989 | {
|
---|
1990 | LWIP_ASSERT_CORE_LOCKED();
|
---|
1991 | /* This function is allowed to be called for both listen pcbs and
|
---|
1992 | connection pcbs. */
|
---|
1993 | if (pcb != NULL) {
|
---|
1994 | pcb->callback_arg = arg;
|
---|
1995 | }
|
---|
1996 | }
|
---|
1997 | #if LWIP_CALLBACK_API
|
---|
1998 |
|
---|
1999 | /**
|
---|
2000 | * @ingroup tcp_raw
|
---|
2001 | * Sets the callback function that will be called when new data
|
---|
2002 | * arrives. The callback function will be passed a NULL pbuf to
|
---|
2003 | * indicate that the remote host has closed the connection. If the
|
---|
2004 | * callback function returns ERR_OK or ERR_ABRT it must have
|
---|
2005 | * freed the pbuf, otherwise it must not have freed it.
|
---|
2006 | *
|
---|
2007 | * @param pcb tcp_pcb to set the recv callback
|
---|
2008 | * @param recv callback function to call for this pcb when data is received
|
---|
2009 | */
|
---|
2010 | void
|
---|
2011 | tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
|
---|
2012 | {
|
---|
2013 | LWIP_ASSERT_CORE_LOCKED();
|
---|
2014 | if (pcb != NULL) {
|
---|
2015 | LWIP_ASSERT("invalid socket state for recv callback", pcb->state != LISTEN);
|
---|
2016 | pcb->recv = recv;
|
---|
2017 | }
|
---|
2018 | }
|
---|
2019 |
|
---|
2020 | /**
|
---|
2021 | * @ingroup tcp_raw
|
---|
2022 | * Specifies the callback function that should be called when data has
|
---|
2023 | * successfully been received (i.e., acknowledged) by the remote
|
---|
2024 | * host. The len argument passed to the callback function gives the
|
---|
2025 | * amount bytes that was acknowledged by the last acknowledgment.
|
---|
2026 | *
|
---|
2027 | * @param pcb tcp_pcb to set the sent callback
|
---|
2028 | * @param sent callback function to call for this pcb when data is successfully sent
|
---|
2029 | */
|
---|
2030 | void
|
---|
2031 | tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
|
---|
2032 | {
|
---|
2033 | LWIP_ASSERT_CORE_LOCKED();
|
---|
2034 | if (pcb != NULL) {
|
---|
2035 | LWIP_ASSERT("invalid socket state for sent callback", pcb->state != LISTEN);
|
---|
2036 | pcb->sent = sent;
|
---|
2037 | }
|
---|
2038 | }
|
---|
2039 |
|
---|
2040 | /**
|
---|
2041 | * @ingroup tcp_raw
|
---|
2042 | * Used to specify the function that should be called when a fatal error
|
---|
2043 | * has occurred on the connection.
|
---|
2044 | *
|
---|
2045 | * If a connection is aborted because of an error, the application is
|
---|
2046 | * alerted of this event by the err callback. Errors that might abort a
|
---|
2047 | * connection are when there is a shortage of memory. The callback
|
---|
2048 | * function to be called is set using the tcp_err() function.
|
---|
2049 | *
|
---|
2050 | * @note The corresponding pcb is already freed when this callback is called!
|
---|
2051 | *
|
---|
2052 | * @param pcb tcp_pcb to set the err callback
|
---|
2053 | * @param err callback function to call for this pcb when a fatal error
|
---|
2054 | * has occurred on the connection
|
---|
2055 | */
|
---|
2056 | void
|
---|
2057 | tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
|
---|
2058 | {
|
---|
2059 | LWIP_ASSERT_CORE_LOCKED();
|
---|
2060 | if (pcb != NULL) {
|
---|
2061 | LWIP_ASSERT("invalid socket state for err callback", pcb->state != LISTEN);
|
---|
2062 | pcb->errf = err;
|
---|
2063 | }
|
---|
2064 | }
|
---|
2065 |
|
---|
2066 | /**
|
---|
2067 | * @ingroup tcp_raw
|
---|
2068 | * Used for specifying the function that should be called when a
|
---|
2069 | * LISTENing connection has been connected to another host.
|
---|
2070 | *
|
---|
2071 | * @param pcb tcp_pcb to set the accept callback
|
---|
2072 | * @param accept callback function to call for this pcb when LISTENing
|
---|
2073 | * connection has been connected to another host
|
---|
2074 | */
|
---|
2075 | void
|
---|
2076 | tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
|
---|
2077 | {
|
---|
2078 | LWIP_ASSERT_CORE_LOCKED();
|
---|
2079 | if ((pcb != NULL) && (pcb->state == LISTEN)) {
|
---|
2080 | struct tcp_pcb_listen *lpcb = (struct tcp_pcb_listen *)pcb;
|
---|
2081 | lpcb->accept = accept;
|
---|
2082 | }
|
---|
2083 | }
|
---|
2084 | #endif /* LWIP_CALLBACK_API */
|
---|
2085 |
|
---|
2086 |
|
---|
2087 | /**
|
---|
2088 | * @ingroup tcp_raw
|
---|
2089 | * Specifies the polling interval and the callback function that should
|
---|
2090 | * be called to poll the application. The interval is specified in
|
---|
2091 | * number of TCP coarse grained timer shots, which typically occurs
|
---|
2092 | * twice a second. An interval of 10 means that the application would
|
---|
2093 | * be polled every 5 seconds.
|
---|
2094 | *
|
---|
2095 | * When a connection is idle (i.e., no data is either transmitted or
|
---|
2096 | * received), lwIP will repeatedly poll the application by calling a
|
---|
2097 | * specified callback function. This can be used either as a watchdog
|
---|
2098 | * timer for killing connections that have stayed idle for too long, or
|
---|
2099 | * as a method of waiting for memory to become available. For instance,
|
---|
2100 | * if a call to tcp_write() has failed because memory wasn't available,
|
---|
2101 | * the application may use the polling functionality to call tcp_write()
|
---|
2102 | * again when the connection has been idle for a while.
|
---|
2103 | */
|
---|
2104 | void
|
---|
2105 | tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
|
---|
2106 | {
|
---|
2107 | LWIP_ASSERT_CORE_LOCKED();
|
---|
2108 |
|
---|
2109 | LWIP_ERROR("tcp_poll: invalid pcb", pcb != NULL, return);
|
---|
2110 | LWIP_ASSERT("invalid socket state for poll", pcb->state != LISTEN);
|
---|
2111 |
|
---|
2112 | #if LWIP_CALLBACK_API
|
---|
2113 | pcb->poll = poll;
|
---|
2114 | #else /* LWIP_CALLBACK_API */
|
---|
2115 | LWIP_UNUSED_ARG(poll);
|
---|
2116 | #endif /* LWIP_CALLBACK_API */
|
---|
2117 | pcb->pollinterval = interval;
|
---|
2118 | }
|
---|
2119 |
|
---|
2120 | /**
|
---|
2121 | * Purges a TCP PCB. Removes any buffered data and frees the buffer memory
|
---|
2122 | * (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
|
---|
2123 | *
|
---|
2124 | * @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
|
---|
2125 | */
|
---|
2126 | void
|
---|
2127 | tcp_pcb_purge(struct tcp_pcb *pcb)
|
---|
2128 | {
|
---|
2129 | LWIP_ERROR("tcp_pcb_purge: invalid pcb", pcb != NULL, return);
|
---|
2130 |
|
---|
2131 | if (pcb->state != CLOSED &&
|
---|
2132 | pcb->state != TIME_WAIT &&
|
---|
2133 | pcb->state != LISTEN) {
|
---|
2134 |
|
---|
2135 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
|
---|
2136 |
|
---|
2137 | tcp_backlog_accepted(pcb);
|
---|
2138 |
|
---|
2139 | if (pcb->refused_data != NULL) {
|
---|
2140 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
|
---|
2141 | pbuf_free(pcb->refused_data);
|
---|
2142 | pcb->refused_data = NULL;
|
---|
2143 | }
|
---|
2144 | if (pcb->unsent != NULL) {
|
---|
2145 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
|
---|
2146 | }
|
---|
2147 | if (pcb->unacked != NULL) {
|
---|
2148 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
|
---|
2149 | }
|
---|
2150 | #if TCP_QUEUE_OOSEQ
|
---|
2151 | if (pcb->ooseq != NULL) {
|
---|
2152 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
|
---|
2153 | tcp_free_ooseq(pcb);
|
---|
2154 | }
|
---|
2155 | #endif /* TCP_QUEUE_OOSEQ */
|
---|
2156 |
|
---|
2157 | /* Stop the retransmission timer as it will expect data on unacked
|
---|
2158 | queue if it fires */
|
---|
2159 | pcb->rtime = -1;
|
---|
2160 |
|
---|
2161 | tcp_segs_free(pcb->unsent);
|
---|
2162 | tcp_segs_free(pcb->unacked);
|
---|
2163 | pcb->unacked = pcb->unsent = NULL;
|
---|
2164 | #if TCP_OVERSIZE
|
---|
2165 | pcb->unsent_oversize = 0;
|
---|
2166 | #endif /* TCP_OVERSIZE */
|
---|
2167 | }
|
---|
2168 | }
|
---|
2169 |
|
---|
2170 | /**
|
---|
2171 | * Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
|
---|
2172 | *
|
---|
2173 | * @param pcblist PCB list to purge.
|
---|
2174 | * @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
|
---|
2175 | */
|
---|
2176 | void
|
---|
2177 | tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb)
|
---|
2178 | {
|
---|
2179 | LWIP_ASSERT("tcp_pcb_remove: invalid pcb", pcb != NULL);
|
---|
2180 | LWIP_ASSERT("tcp_pcb_remove: invalid pcblist", pcblist != NULL);
|
---|
2181 |
|
---|
2182 | TCP_RMV(pcblist, pcb);
|
---|
2183 |
|
---|
2184 | tcp_pcb_purge(pcb);
|
---|
2185 |
|
---|
2186 | /* if there is an outstanding delayed ACKs, send it */
|
---|
2187 | if ((pcb->state != TIME_WAIT) &&
|
---|
2188 | (pcb->state != LISTEN) &&
|
---|
2189 | (pcb->flags & TF_ACK_DELAY)) {
|
---|
2190 | tcp_ack_now(pcb);
|
---|
2191 | tcp_output(pcb);
|
---|
2192 | }
|
---|
2193 |
|
---|
2194 | if (pcb->state != LISTEN) {
|
---|
2195 | LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
|
---|
2196 | LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
|
---|
2197 | #if TCP_QUEUE_OOSEQ
|
---|
2198 | LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
|
---|
2199 | #endif /* TCP_QUEUE_OOSEQ */
|
---|
2200 | }
|
---|
2201 |
|
---|
2202 | pcb->state = CLOSED;
|
---|
2203 | /* reset the local port to prevent the pcb from being 'bound' */
|
---|
2204 | pcb->local_port = 0;
|
---|
2205 |
|
---|
2206 | LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
|
---|
2207 | }
|
---|
2208 |
|
---|
2209 | /**
|
---|
2210 | * Calculates a new initial sequence number for new connections.
|
---|
2211 | *
|
---|
2212 | * @return u32_t pseudo random sequence number
|
---|
2213 | */
|
---|
2214 | u32_t
|
---|
2215 | tcp_next_iss(struct tcp_pcb *pcb)
|
---|
2216 | {
|
---|
2217 | #ifdef LWIP_HOOK_TCP_ISN
|
---|
2218 | LWIP_ASSERT("tcp_next_iss: invalid pcb", pcb != NULL);
|
---|
2219 | return LWIP_HOOK_TCP_ISN(&pcb->local_ip, pcb->local_port, &pcb->remote_ip, pcb->remote_port);
|
---|
2220 | #else /* LWIP_HOOK_TCP_ISN */
|
---|
2221 | static u32_t iss = 6510;
|
---|
2222 |
|
---|
2223 | LWIP_ASSERT("tcp_next_iss: invalid pcb", pcb != NULL);
|
---|
2224 | LWIP_UNUSED_ARG(pcb);
|
---|
2225 |
|
---|
2226 | iss += tcp_ticks; /* XXX */
|
---|
2227 | return iss;
|
---|
2228 | #endif /* LWIP_HOOK_TCP_ISN */
|
---|
2229 | }
|
---|
2230 |
|
---|
2231 | #if TCP_CALCULATE_EFF_SEND_MSS
|
---|
2232 | /**
|
---|
2233 | * Calculates the effective send mss that can be used for a specific IP address
|
---|
2234 | * by calculating the minimum of TCP_MSS and the mtu (if set) of the target
|
---|
2235 | * netif (if not NULL).
|
---|
2236 | */
|
---|
2237 | u16_t
|
---|
2238 | tcp_eff_send_mss_netif(u16_t sendmss, struct netif *outif, const ip_addr_t *dest)
|
---|
2239 | {
|
---|
2240 | u16_t mss_s;
|
---|
2241 | u16_t mtu;
|
---|
2242 |
|
---|
2243 | LWIP_UNUSED_ARG(dest); /* in case IPv6 is disabled */
|
---|
2244 |
|
---|
2245 | LWIP_ASSERT("tcp_eff_send_mss_netif: invalid dst_ip", dest != NULL);
|
---|
2246 |
|
---|
2247 | #if LWIP_IPV6
|
---|
2248 | #if LWIP_IPV4
|
---|
2249 | if (IP_IS_V6(dest))
|
---|
2250 | #endif /* LWIP_IPV4 */
|
---|
2251 | {
|
---|
2252 | /* First look in destination cache, to see if there is a Path MTU. */
|
---|
2253 | mtu = nd6_get_destination_mtu(ip_2_ip6(dest), outif);
|
---|
2254 | }
|
---|
2255 | #if LWIP_IPV4
|
---|
2256 | else
|
---|
2257 | #endif /* LWIP_IPV4 */
|
---|
2258 | #endif /* LWIP_IPV6 */
|
---|
2259 | #if LWIP_IPV4
|
---|
2260 | {
|
---|
2261 | if (outif == NULL) {
|
---|
2262 | return sendmss;
|
---|
2263 | }
|
---|
2264 | mtu = outif->mtu;
|
---|
2265 | }
|
---|
2266 | #endif /* LWIP_IPV4 */
|
---|
2267 |
|
---|
2268 | if (mtu != 0) {
|
---|
2269 | u16_t offset;
|
---|
2270 | #if LWIP_IPV6
|
---|
2271 | #if LWIP_IPV4
|
---|
2272 | if (IP_IS_V6(dest))
|
---|
2273 | #endif /* LWIP_IPV4 */
|
---|
2274 | {
|
---|
2275 | offset = IP6_HLEN + TCP_HLEN;
|
---|
2276 | }
|
---|
2277 | #if LWIP_IPV4
|
---|
2278 | else
|
---|
2279 | #endif /* LWIP_IPV4 */
|
---|
2280 | #endif /* LWIP_IPV6 */
|
---|
2281 | #if LWIP_IPV4
|
---|
2282 | {
|
---|
2283 | offset = IP_HLEN + TCP_HLEN;
|
---|
2284 | }
|
---|
2285 | #endif /* LWIP_IPV4 */
|
---|
2286 | mss_s = (mtu > offset) ? (u16_t)(mtu - offset) : 0;
|
---|
2287 | /* RFC 1122, chap 4.2.2.6:
|
---|
2288 | * Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
|
---|
2289 | * We correct for TCP options in tcp_write(), and don't support IP options.
|
---|
2290 | */
|
---|
2291 | sendmss = LWIP_MIN(sendmss, mss_s);
|
---|
2292 | }
|
---|
2293 | return sendmss;
|
---|
2294 | }
|
---|
2295 | #endif /* TCP_CALCULATE_EFF_SEND_MSS */
|
---|
2296 |
|
---|
2297 | /** Helper function for tcp_netif_ip_addr_changed() that iterates a pcb list */
|
---|
2298 | static void
|
---|
2299 | tcp_netif_ip_addr_changed_pcblist(const ip_addr_t *old_addr, struct tcp_pcb *pcb_list)
|
---|
2300 | {
|
---|
2301 | struct tcp_pcb *pcb;
|
---|
2302 | pcb = pcb_list;
|
---|
2303 |
|
---|
2304 | LWIP_ASSERT("tcp_netif_ip_addr_changed_pcblist: invalid old_addr", old_addr != NULL);
|
---|
2305 |
|
---|
2306 | while (pcb != NULL) {
|
---|
2307 | /* PCB bound to current local interface address? */
|
---|
2308 | if (ip_addr_cmp(&pcb->local_ip, old_addr)
|
---|
2309 | #if LWIP_AUTOIP
|
---|
2310 | /* connections to link-local addresses must persist (RFC3927 ch. 1.9) */
|
---|
2311 | && (!IP_IS_V4_VAL(pcb->local_ip) || !ip4_addr_islinklocal(ip_2_ip4(&pcb->local_ip)))
|
---|
2312 | #endif /* LWIP_AUTOIP */
|
---|
2313 | ) {
|
---|
2314 | /* this connection must be aborted */
|
---|
2315 | struct tcp_pcb *next = pcb->next;
|
---|
2316 | LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_STATE, ("netif_set_ipaddr: aborting TCP pcb %p\n", (void *)pcb));
|
---|
2317 | tcp_abort(pcb);
|
---|
2318 | pcb = next;
|
---|
2319 | } else {
|
---|
2320 | pcb = pcb->next;
|
---|
2321 | }
|
---|
2322 | }
|
---|
2323 | }
|
---|
2324 |
|
---|
2325 | /** This function is called from netif.c when address is changed or netif is removed
|
---|
2326 | *
|
---|
2327 | * @param old_addr IP address of the netif before change
|
---|
2328 | * @param new_addr IP address of the netif after change or NULL if netif has been removed
|
---|
2329 | */
|
---|
2330 | void
|
---|
2331 | tcp_netif_ip_addr_changed(const ip_addr_t *old_addr, const ip_addr_t *new_addr)
|
---|
2332 | {
|
---|
2333 | struct tcp_pcb_listen *lpcb;
|
---|
2334 |
|
---|
2335 | if (!ip_addr_isany(old_addr)) {
|
---|
2336 | tcp_netif_ip_addr_changed_pcblist(old_addr, tcp_active_pcbs);
|
---|
2337 | tcp_netif_ip_addr_changed_pcblist(old_addr, tcp_bound_pcbs);
|
---|
2338 |
|
---|
2339 | if (!ip_addr_isany(new_addr)) {
|
---|
2340 | /* PCB bound to current local interface address? */
|
---|
2341 | for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
|
---|
2342 | /* PCB bound to current local interface address? */
|
---|
2343 | if (ip_addr_cmp(&lpcb->local_ip, old_addr)) {
|
---|
2344 | /* The PCB is listening to the old ipaddr and
|
---|
2345 | * is set to listen to the new one instead */
|
---|
2346 | ip_addr_copy(lpcb->local_ip, *new_addr);
|
---|
2347 | }
|
---|
2348 | }
|
---|
2349 | }
|
---|
2350 | }
|
---|
2351 | }
|
---|
2352 |
|
---|
2353 | const char *
|
---|
2354 | tcp_debug_state_str(enum tcp_state s)
|
---|
2355 | {
|
---|
2356 | return tcp_state_str[s];
|
---|
2357 | }
|
---|
2358 |
|
---|
2359 | err_t
|
---|
2360 | tcp_tcp_get_tcp_addrinfo(struct tcp_pcb *pcb, int local, ip_addr_t *addr, u16_t *port)
|
---|
2361 | {
|
---|
2362 | if (pcb) {
|
---|
2363 | if (local) {
|
---|
2364 | if (addr) {
|
---|
2365 | *addr = pcb->local_ip;
|
---|
2366 | }
|
---|
2367 | if (port) {
|
---|
2368 | *port = pcb->local_port;
|
---|
2369 | }
|
---|
2370 | } else {
|
---|
2371 | if (addr) {
|
---|
2372 | *addr = pcb->remote_ip;
|
---|
2373 | }
|
---|
2374 | if (port) {
|
---|
2375 | *port = pcb->remote_port;
|
---|
2376 | }
|
---|
2377 | }
|
---|
2378 | return ERR_OK;
|
---|
2379 | }
|
---|
2380 | return ERR_VAL;
|
---|
2381 | }
|
---|
2382 |
|
---|
2383 | #if TCP_QUEUE_OOSEQ
|
---|
2384 | /* Free all ooseq pbufs (and possibly reset SACK state) */
|
---|
2385 | void
|
---|
2386 | tcp_free_ooseq(struct tcp_pcb *pcb)
|
---|
2387 | {
|
---|
2388 | if (pcb->ooseq) {
|
---|
2389 | tcp_segs_free(pcb->ooseq);
|
---|
2390 | pcb->ooseq = NULL;
|
---|
2391 | #if LWIP_TCP_SACK_OUT
|
---|
2392 | memset(pcb->rcv_sacks, 0, sizeof(pcb->rcv_sacks));
|
---|
2393 | #endif /* LWIP_TCP_SACK_OUT */
|
---|
2394 | }
|
---|
2395 | }
|
---|
2396 | #endif /* TCP_QUEUE_OOSEQ */
|
---|
2397 |
|
---|
2398 | #if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
|
---|
2399 | /**
|
---|
2400 | * Print a tcp header for debugging purposes.
|
---|
2401 | *
|
---|
2402 | * @param tcphdr pointer to a struct tcp_hdr
|
---|
2403 | */
|
---|
2404 | void
|
---|
2405 | tcp_debug_print(struct tcp_hdr *tcphdr)
|
---|
2406 | {
|
---|
2407 | LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
|
---|
2408 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
---|
2409 | LWIP_DEBUGF(TCP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
|
---|
2410 | lwip_ntohs(tcphdr->src), lwip_ntohs(tcphdr->dest)));
|
---|
2411 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
---|
2412 | LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (seq no)\n",
|
---|
2413 | lwip_ntohl(tcphdr->seqno)));
|
---|
2414 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
---|
2415 | LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (ack no)\n",
|
---|
2416 | lwip_ntohl(tcphdr->ackno)));
|
---|
2417 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
---|
2418 | LWIP_DEBUGF(TCP_DEBUG, ("| %2"U16_F" | |%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"| %5"U16_F" | (hdrlen, flags (",
|
---|
2419 | TCPH_HDRLEN(tcphdr),
|
---|
2420 | (u16_t)(TCPH_FLAGS(tcphdr) >> 5 & 1),
|
---|
2421 | (u16_t)(TCPH_FLAGS(tcphdr) >> 4 & 1),
|
---|
2422 | (u16_t)(TCPH_FLAGS(tcphdr) >> 3 & 1),
|
---|
2423 | (u16_t)(TCPH_FLAGS(tcphdr) >> 2 & 1),
|
---|
2424 | (u16_t)(TCPH_FLAGS(tcphdr) >> 1 & 1),
|
---|
2425 | (u16_t)(TCPH_FLAGS(tcphdr) & 1),
|
---|
2426 | lwip_ntohs(tcphdr->wnd)));
|
---|
2427 | tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
|
---|
2428 | LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
|
---|
2429 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
---|
2430 | LWIP_DEBUGF(TCP_DEBUG, ("| 0x%04"X16_F" | %5"U16_F" | (chksum, urgp)\n",
|
---|
2431 | lwip_ntohs(tcphdr->chksum), lwip_ntohs(tcphdr->urgp)));
|
---|
2432 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
---|
2433 | }
|
---|
2434 |
|
---|
2435 | /**
|
---|
2436 | * Print a tcp state for debugging purposes.
|
---|
2437 | *
|
---|
2438 | * @param s enum tcp_state to print
|
---|
2439 | */
|
---|
2440 | void
|
---|
2441 | tcp_debug_print_state(enum tcp_state s)
|
---|
2442 | {
|
---|
2443 | LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
|
---|
2444 | }
|
---|
2445 |
|
---|
2446 | /**
|
---|
2447 | * Print tcp flags for debugging purposes.
|
---|
2448 | *
|
---|
2449 | * @param flags tcp flags, all active flags are printed
|
---|
2450 | */
|
---|
2451 | void
|
---|
2452 | tcp_debug_print_flags(u8_t flags)
|
---|
2453 | {
|
---|
2454 | if (flags & TCP_FIN) {
|
---|
2455 | LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
|
---|
2456 | }
|
---|
2457 | if (flags & TCP_SYN) {
|
---|
2458 | LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
|
---|
2459 | }
|
---|
2460 | if (flags & TCP_RST) {
|
---|
2461 | LWIP_DEBUGF(TCP_DEBUG, ("RST "));
|
---|
2462 | }
|
---|
2463 | if (flags & TCP_PSH) {
|
---|
2464 | LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
|
---|
2465 | }
|
---|
2466 | if (flags & TCP_ACK) {
|
---|
2467 | LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
|
---|
2468 | }
|
---|
2469 | if (flags & TCP_URG) {
|
---|
2470 | LWIP_DEBUGF(TCP_DEBUG, ("URG "));
|
---|
2471 | }
|
---|
2472 | if (flags & TCP_ECE) {
|
---|
2473 | LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
|
---|
2474 | }
|
---|
2475 | if (flags & TCP_CWR) {
|
---|
2476 | LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
|
---|
2477 | }
|
---|
2478 | LWIP_DEBUGF(TCP_DEBUG, ("\n"));
|
---|
2479 | }
|
---|
2480 |
|
---|
2481 | /**
|
---|
2482 | * Print all tcp_pcbs in every list for debugging purposes.
|
---|
2483 | */
|
---|
2484 | void
|
---|
2485 | tcp_debug_print_pcbs(void)
|
---|
2486 | {
|
---|
2487 | struct tcp_pcb *pcb;
|
---|
2488 | struct tcp_pcb_listen *pcbl;
|
---|
2489 |
|
---|
2490 | LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
|
---|
2491 | for (pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
|
---|
2492 | LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
|
---|
2493 | pcb->local_port, pcb->remote_port,
|
---|
2494 | pcb->snd_nxt, pcb->rcv_nxt));
|
---|
2495 | tcp_debug_print_state(pcb->state);
|
---|
2496 | }
|
---|
2497 |
|
---|
2498 | LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
|
---|
2499 | for (pcbl = tcp_listen_pcbs.listen_pcbs; pcbl != NULL; pcbl = pcbl->next) {
|
---|
2500 | LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F" ", pcbl->local_port));
|
---|
2501 | tcp_debug_print_state(pcbl->state);
|
---|
2502 | }
|
---|
2503 |
|
---|
2504 | LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
|
---|
2505 | for (pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
|
---|
2506 | LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
|
---|
2507 | pcb->local_port, pcb->remote_port,
|
---|
2508 | pcb->snd_nxt, pcb->rcv_nxt));
|
---|
2509 | tcp_debug_print_state(pcb->state);
|
---|
2510 | }
|
---|
2511 | }
|
---|
2512 |
|
---|
2513 | /**
|
---|
2514 | * Check state consistency of the tcp_pcb lists.
|
---|
2515 | */
|
---|
2516 | s16_t
|
---|
2517 | tcp_pcbs_sane(void)
|
---|
2518 | {
|
---|
2519 | struct tcp_pcb *pcb;
|
---|
2520 | for (pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
|
---|
2521 | LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
|
---|
2522 | LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
|
---|
2523 | LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
|
---|
2524 | }
|
---|
2525 | for (pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
|
---|
2526 | LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
|
---|
2527 | }
|
---|
2528 | return 1;
|
---|
2529 | }
|
---|
2530 | #endif /* TCP_DEBUG */
|
---|
2531 |
|
---|
2532 | #if LWIP_TCP_PCB_NUM_EXT_ARGS
|
---|
2533 | /**
|
---|
2534 | * @defgroup tcp_raw_extargs ext arguments
|
---|
2535 | * @ingroup tcp_raw
|
---|
2536 | * Additional data storage per tcp pcb\n
|
---|
2537 | * @see @ref tcp_raw
|
---|
2538 | *
|
---|
2539 | * When LWIP_TCP_PCB_NUM_EXT_ARGS is > 0, every tcp pcb (including listen pcb)
|
---|
2540 | * includes a number of additional argument entries in an array.
|
---|
2541 | *
|
---|
2542 | * To support memory management, in addition to a 'void *', callbacks can be
|
---|
2543 | * provided to manage transition from listening pcbs to connections and to
|
---|
2544 | * deallocate memory when a pcb is deallocated (see struct @ref tcp_ext_arg_callbacks).
|
---|
2545 | *
|
---|
2546 | * After allocating this index, use @ref tcp_ext_arg_set and @ref tcp_ext_arg_get
|
---|
2547 | * to store and load arguments from this index for a given pcb.
|
---|
2548 | */
|
---|
2549 |
|
---|
2550 | static u8_t tcp_ext_arg_id;
|
---|
2551 |
|
---|
2552 | /**
|
---|
2553 | * @ingroup tcp_raw_extargs
|
---|
2554 | * Allocate an index to store data in ext_args member of struct tcp_pcb.
|
---|
2555 | * Returned value is an index in mentioned array.
|
---|
2556 | * The index is *global* over all pcbs!
|
---|
2557 | *
|
---|
2558 | * When @ref LWIP_TCP_PCB_NUM_EXT_ARGS is > 0, every tcp pcb (including listen pcb)
|
---|
2559 | * includes a number of additional argument entries in an array.
|
---|
2560 | *
|
---|
2561 | * To support memory management, in addition to a 'void *', callbacks can be
|
---|
2562 | * provided to manage transition from listening pcbs to connections and to
|
---|
2563 | * deallocate memory when a pcb is deallocated (see struct @ref tcp_ext_arg_callbacks).
|
---|
2564 | *
|
---|
2565 | * After allocating this index, use @ref tcp_ext_arg_set and @ref tcp_ext_arg_get
|
---|
2566 | * to store and load arguments from this index for a given pcb.
|
---|
2567 | *
|
---|
2568 | * @return a unique index into struct tcp_pcb.ext_args
|
---|
2569 | */
|
---|
2570 | u8_t
|
---|
2571 | tcp_ext_arg_alloc_id(void)
|
---|
2572 | {
|
---|
2573 | u8_t result = tcp_ext_arg_id;
|
---|
2574 | tcp_ext_arg_id++;
|
---|
2575 |
|
---|
2576 | LWIP_ASSERT_CORE_LOCKED();
|
---|
2577 |
|
---|
2578 | #if LWIP_TCP_PCB_NUM_EXT_ARGS >= 255
|
---|
2579 | #error LWIP_TCP_PCB_NUM_EXT_ARGS
|
---|
2580 | #endif
|
---|
2581 | LWIP_ASSERT("Increase LWIP_TCP_PCB_NUM_EXT_ARGS in lwipopts.h", result < LWIP_TCP_PCB_NUM_EXT_ARGS);
|
---|
2582 | return result;
|
---|
2583 | }
|
---|
2584 |
|
---|
2585 | /**
|
---|
2586 | * @ingroup tcp_raw_extargs
|
---|
2587 | * Set callbacks for a given index of ext_args on the specified pcb.
|
---|
2588 | *
|
---|
2589 | * @param pcb tcp_pcb for which to set the callback
|
---|
2590 | * @param id ext_args index to set (allocated via @ref tcp_ext_arg_alloc_id)
|
---|
2591 | * @param callbacks callback table (const since it is referenced, not copied!)
|
---|
2592 | */
|
---|
2593 | void
|
---|
2594 | tcp_ext_arg_set_callbacks(struct tcp_pcb *pcb, uint8_t id, const struct tcp_ext_arg_callbacks * const callbacks)
|
---|
2595 | {
|
---|
2596 | LWIP_ASSERT("pcb != NULL", pcb != NULL);
|
---|
2597 | LWIP_ASSERT("id < LWIP_TCP_PCB_NUM_EXT_ARGS", id < LWIP_TCP_PCB_NUM_EXT_ARGS);
|
---|
2598 | LWIP_ASSERT("callbacks != NULL", callbacks != NULL);
|
---|
2599 |
|
---|
2600 | LWIP_ASSERT_CORE_LOCKED();
|
---|
2601 |
|
---|
2602 | pcb->ext_args[id].callbacks = callbacks;
|
---|
2603 | }
|
---|
2604 |
|
---|
2605 | /**
|
---|
2606 | * @ingroup tcp_raw_extargs
|
---|
2607 | * Set data for a given index of ext_args on the specified pcb.
|
---|
2608 | *
|
---|
2609 | * @param pcb tcp_pcb for which to set the data
|
---|
2610 | * @param id ext_args index to set (allocated via @ref tcp_ext_arg_alloc_id)
|
---|
2611 | * @param arg data pointer to set
|
---|
2612 | */
|
---|
2613 | void tcp_ext_arg_set(struct tcp_pcb *pcb, uint8_t id, void *arg)
|
---|
2614 | {
|
---|
2615 | LWIP_ASSERT("pcb != NULL", pcb != NULL);
|
---|
2616 | LWIP_ASSERT("id < LWIP_TCP_PCB_NUM_EXT_ARGS", id < LWIP_TCP_PCB_NUM_EXT_ARGS);
|
---|
2617 |
|
---|
2618 | LWIP_ASSERT_CORE_LOCKED();
|
---|
2619 |
|
---|
2620 | pcb->ext_args[id].data = arg;
|
---|
2621 | }
|
---|
2622 |
|
---|
2623 | /**
|
---|
2624 | * @ingroup tcp_raw_extargs
|
---|
2625 | * Set data for a given index of ext_args on the specified pcb.
|
---|
2626 | *
|
---|
2627 | * @param pcb tcp_pcb for which to set the data
|
---|
2628 | * @param id ext_args index to set (allocated via @ref tcp_ext_arg_alloc_id)
|
---|
2629 | * @return data pointer at the given index
|
---|
2630 | */
|
---|
2631 | void *tcp_ext_arg_get(const struct tcp_pcb *pcb, uint8_t id)
|
---|
2632 | {
|
---|
2633 | LWIP_ASSERT("pcb != NULL", pcb != NULL);
|
---|
2634 | LWIP_ASSERT("id < LWIP_TCP_PCB_NUM_EXT_ARGS", id < LWIP_TCP_PCB_NUM_EXT_ARGS);
|
---|
2635 |
|
---|
2636 | LWIP_ASSERT_CORE_LOCKED();
|
---|
2637 |
|
---|
2638 | return pcb->ext_args[id].data;
|
---|
2639 | }
|
---|
2640 |
|
---|
2641 | /** This function calls the "destroy" callback for all ext_args once a pcb is
|
---|
2642 | * freed.
|
---|
2643 | */
|
---|
2644 | static void
|
---|
2645 | tcp_ext_arg_invoke_callbacks_destroyed(struct tcp_pcb_ext_args *ext_args)
|
---|
2646 | {
|
---|
2647 | int i;
|
---|
2648 | LWIP_ASSERT("ext_args != NULL", ext_args != NULL);
|
---|
2649 |
|
---|
2650 | for (i = 0; i < LWIP_TCP_PCB_NUM_EXT_ARGS; i++) {
|
---|
2651 | if (ext_args[i].callbacks != NULL) {
|
---|
2652 | if (ext_args[i].callbacks->destroy != NULL) {
|
---|
2653 | ext_args[i].callbacks->destroy((u8_t)i, ext_args[i].data);
|
---|
2654 | }
|
---|
2655 | }
|
---|
2656 | }
|
---|
2657 | }
|
---|
2658 |
|
---|
2659 | /** This function calls the "passive_open" callback for all ext_args if a connection
|
---|
2660 | * is in the process of being accepted. This is called just after the SYN is
|
---|
2661 | * received and before a SYN/ACK is sent, to allow to modify the very first
|
---|
2662 | * segment sent even on passive open. Naturally, the "accepted" callback of the
|
---|
2663 | * pcb has not been called yet!
|
---|
2664 | */
|
---|
2665 | err_t
|
---|
2666 | tcp_ext_arg_invoke_callbacks_passive_open(struct tcp_pcb_listen *lpcb, struct tcp_pcb *cpcb)
|
---|
2667 | {
|
---|
2668 | int i;
|
---|
2669 | LWIP_ASSERT("lpcb != NULL", lpcb != NULL);
|
---|
2670 | LWIP_ASSERT("cpcb != NULL", cpcb != NULL);
|
---|
2671 |
|
---|
2672 | for (i = 0; i < LWIP_TCP_PCB_NUM_EXT_ARGS; i++) {
|
---|
2673 | if (lpcb->ext_args[i].callbacks != NULL) {
|
---|
2674 | if (lpcb->ext_args[i].callbacks->passive_open != NULL) {
|
---|
2675 | err_t err = lpcb->ext_args[i].callbacks->passive_open((u8_t)i, lpcb, cpcb);
|
---|
2676 | if (err != ERR_OK) {
|
---|
2677 | return err;
|
---|
2678 | }
|
---|
2679 | }
|
---|
2680 | }
|
---|
2681 | }
|
---|
2682 | return ERR_OK;
|
---|
2683 | }
|
---|
2684 | #endif /* LWIP_TCP_PCB_NUM_EXT_ARGS */
|
---|
2685 |
|
---|
2686 | #endif /* LWIP_TCP */
|
---|