1 | /**
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2 | * @file
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3 | * Application layered TCP connection API (to be used from TCPIP thread)\n
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4 | * This interface mimics the tcp callback API to the application while preventing
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5 | * direct linking (much like virtual functions).
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6 | * This way, an application can make use of other application layer protocols
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7 | * on top of TCP without knowing the details (e.g. TLS, proxy connection).
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8 | *
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9 | * This file contains the base implementation calling into tcp.
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10 | */
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11 |
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12 | /*
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13 | * Copyright (c) 2017 Simon Goldschmidt
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14 | * All rights reserved.
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15 | *
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16 | * Redistribution and use in source and binary forms, with or without modification,
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17 | * are permitted provided that the following conditions are met:
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18 | *
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19 | * 1. Redistributions of source code must retain the above copyright notice,
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20 | * this list of conditions and the following disclaimer.
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21 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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22 | * this list of conditions and the following disclaimer in the documentation
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23 | * and/or other materials provided with the distribution.
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24 | * 3. The name of the author may not be used to endorse or promote products
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25 | * derived from this software without specific prior written permission.
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26 | *
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27 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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28 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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29 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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30 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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31 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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32 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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33 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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34 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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35 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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36 | * OF SUCH DAMAGE.
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37 | *
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38 | * This file is part of the lwIP TCP/IP stack.
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39 | *
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40 | * Author: Simon Goldschmidt <goldsimon@gmx.de>
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41 | *
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42 | */
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43 |
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44 | #include "lwip/opt.h"
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45 |
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46 | #if LWIP_ALTCP /* don't build if not configured for use in lwipopts.h */
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47 |
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48 | #include "lwip/altcp.h"
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49 | #include "lwip/altcp_tcp.h"
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50 | #include "lwip/priv/altcp_priv.h"
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51 | #include "lwip/tcp.h"
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52 | #include "lwip/mem.h"
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53 |
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54 | #include <string.h>
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55 |
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56 | #define ALTCP_TCP_ASSERT_CONN(conn) do { \
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57 | LWIP_ASSERT("conn->inner_conn == NULL", (conn)->inner_conn == NULL); \
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58 | LWIP_UNUSED_ARG(conn); /* for LWIP_NOASSERT */ } while(0)
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59 | #define ALTCP_TCP_ASSERT_CONN_PCB(conn, tpcb) do { \
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60 | LWIP_ASSERT("pcb mismatch", (conn)->state == tpcb); \
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61 | LWIP_UNUSED_ARG(tpcb); /* for LWIP_NOASSERT */ \
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62 | ALTCP_TCP_ASSERT_CONN(conn); } while(0)
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63 |
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64 |
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65 | /* Variable prototype, the actual declaration is at the end of this file
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66 | since it contains pointers to static functions declared here */
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67 | extern const struct altcp_functions altcp_tcp_functions;
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68 |
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69 | static void altcp_tcp_setup(struct altcp_pcb *conn, struct tcp_pcb *tpcb);
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70 |
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71 | /* callback functions for TCP */
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72 | static err_t
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73 | altcp_tcp_accept(void *arg, struct tcp_pcb *new_tpcb, err_t err)
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74 | {
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75 | struct altcp_pcb *listen_conn = (struct altcp_pcb *)arg;
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76 | if (listen_conn && listen_conn->accept) {
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77 | /* create a new altcp_conn to pass to the next 'accept' callback */
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78 | struct altcp_pcb *new_conn = altcp_alloc();
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79 | if (new_conn == NULL) {
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80 | return ERR_MEM;
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81 | }
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82 | altcp_tcp_setup(new_conn, new_tpcb);
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83 | return listen_conn->accept(listen_conn->arg, new_conn, err);
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84 | }
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85 | return ERR_ARG;
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86 | }
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87 |
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88 | static err_t
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89 | altcp_tcp_connected(void *arg, struct tcp_pcb *tpcb, err_t err)
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90 | {
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91 | struct altcp_pcb *conn = (struct altcp_pcb *)arg;
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92 | if (conn) {
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93 | ALTCP_TCP_ASSERT_CONN_PCB(conn, tpcb);
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94 | if (conn->connected) {
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95 | return conn->connected(conn->arg, conn, err);
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96 | }
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97 | }
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98 | return ERR_OK;
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99 | }
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100 |
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101 | static err_t
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102 | altcp_tcp_recv(void *arg, struct tcp_pcb *tpcb, struct pbuf *p, err_t err)
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103 | {
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104 | struct altcp_pcb *conn = (struct altcp_pcb *)arg;
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105 | if (conn) {
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106 | ALTCP_TCP_ASSERT_CONN_PCB(conn, tpcb);
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107 | if (conn->recv) {
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108 | return conn->recv(conn->arg, conn, p, err);
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109 | }
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110 | }
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111 | if (p != NULL) {
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112 | /* prevent memory leaks */
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113 | pbuf_free(p);
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114 | }
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115 | return ERR_OK;
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116 | }
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117 |
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118 | static err_t
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119 | altcp_tcp_sent(void *arg, struct tcp_pcb *tpcb, u16_t len)
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120 | {
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121 | struct altcp_pcb *conn = (struct altcp_pcb *)arg;
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122 | if (conn) {
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123 | ALTCP_TCP_ASSERT_CONN_PCB(conn, tpcb);
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124 | if (conn->sent) {
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125 | return conn->sent(conn->arg, conn, len);
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126 | }
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127 | }
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128 | return ERR_OK;
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129 | }
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130 |
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131 | static err_t
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132 | altcp_tcp_poll(void *arg, struct tcp_pcb *tpcb)
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133 | {
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134 | struct altcp_pcb *conn = (struct altcp_pcb *)arg;
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135 | if (conn) {
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136 | ALTCP_TCP_ASSERT_CONN_PCB(conn, tpcb);
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137 | if (conn->poll) {
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138 | return conn->poll(conn->arg, conn);
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139 | }
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140 | }
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141 | return ERR_OK;
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142 | }
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143 |
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144 | static void
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145 | altcp_tcp_err(void *arg, err_t err)
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146 | {
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147 | struct altcp_pcb *conn = (struct altcp_pcb *)arg;
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148 | if (conn) {
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149 | conn->state = NULL; /* already freed */
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150 | if (conn->err) {
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151 | conn->err(conn->arg, err);
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152 | }
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153 | altcp_free(conn);
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154 | }
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155 | }
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156 |
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157 | /* setup functions */
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158 |
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159 | static void
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160 | altcp_tcp_remove_callbacks(struct tcp_pcb *tpcb)
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161 | {
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162 | tcp_arg(tpcb, NULL);
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163 | tcp_recv(tpcb, NULL);
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164 | tcp_sent(tpcb, NULL);
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165 | tcp_err(tpcb, NULL);
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166 | tcp_poll(tpcb, NULL, tpcb->pollinterval);
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167 | }
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168 |
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169 | static void
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170 | altcp_tcp_setup_callbacks(struct altcp_pcb *conn, struct tcp_pcb *tpcb)
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171 | {
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172 | tcp_arg(tpcb, conn);
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173 | tcp_recv(tpcb, altcp_tcp_recv);
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174 | tcp_sent(tpcb, altcp_tcp_sent);
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175 | tcp_err(tpcb, altcp_tcp_err);
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176 | /* tcp_poll is set when interval is set by application */
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177 | /* listen is set totally different :-) */
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178 | }
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179 |
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180 | static void
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181 | altcp_tcp_setup(struct altcp_pcb *conn, struct tcp_pcb *tpcb)
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182 | {
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183 | altcp_tcp_setup_callbacks(conn, tpcb);
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184 | conn->state = tpcb;
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185 | conn->fns = &altcp_tcp_functions;
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186 | }
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187 |
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188 | struct altcp_pcb *
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189 | altcp_tcp_new_ip_type(u8_t ip_type)
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190 | {
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191 | /* Allocate the tcp pcb first to invoke the priority handling code
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192 | if we're out of pcbs */
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193 | struct tcp_pcb *tpcb = tcp_new_ip_type(ip_type);
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194 | if (tpcb != NULL) {
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195 | struct altcp_pcb *ret = altcp_alloc();
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196 | if (ret != NULL) {
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197 | altcp_tcp_setup(ret, tpcb);
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198 | return ret;
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199 | } else {
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200 | /* altcp_pcb allocation failed -> free the tcp_pcb too */
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201 | tcp_close(tpcb);
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202 | }
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203 | }
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204 | return NULL;
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205 | }
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206 |
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207 | /** altcp_tcp allocator function fitting to @ref altcp_allocator_t / @ref altcp_new.
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208 | *
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209 | * arg pointer is not used for TCP.
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210 | */
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211 | struct altcp_pcb *
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212 | altcp_tcp_alloc(void *arg, u8_t ip_type)
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213 | {
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214 | LWIP_UNUSED_ARG(arg);
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215 | return altcp_tcp_new_ip_type(ip_type);
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216 | }
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217 |
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218 | struct altcp_pcb *
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219 | altcp_tcp_wrap(struct tcp_pcb *tpcb)
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220 | {
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221 | if (tpcb != NULL) {
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222 | struct altcp_pcb *ret = altcp_alloc();
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223 | if (ret != NULL) {
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224 | altcp_tcp_setup(ret, tpcb);
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225 | return ret;
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226 | }
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227 | }
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228 | return NULL;
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229 | }
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230 |
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231 |
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232 | /* "virtual" functions calling into tcp */
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233 | static void
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234 | altcp_tcp_set_poll(struct altcp_pcb *conn, u8_t interval)
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235 | {
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236 | if (conn != NULL) {
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237 | struct tcp_pcb *pcb = (struct tcp_pcb *)conn->state;
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238 | ALTCP_TCP_ASSERT_CONN(conn);
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239 | tcp_poll(pcb, altcp_tcp_poll, interval);
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240 | }
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241 | }
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242 |
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243 | static void
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244 | altcp_tcp_recved(struct altcp_pcb *conn, u16_t len)
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245 | {
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246 | if (conn != NULL) {
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247 | struct tcp_pcb *pcb = (struct tcp_pcb *)conn->state;
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248 | ALTCP_TCP_ASSERT_CONN(conn);
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249 | tcp_recved(pcb, len);
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250 | }
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251 | }
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252 |
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253 | static err_t
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254 | altcp_tcp_bind(struct altcp_pcb *conn, const ip_addr_t *ipaddr, u16_t port)
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255 | {
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256 | struct tcp_pcb *pcb;
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257 | if (conn == NULL) {
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258 | return ERR_VAL;
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259 | }
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260 | ALTCP_TCP_ASSERT_CONN(conn);
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261 | pcb = (struct tcp_pcb *)conn->state;
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262 | return tcp_bind(pcb, ipaddr, port);
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263 | }
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264 |
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265 | static err_t
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266 | altcp_tcp_connect(struct altcp_pcb *conn, const ip_addr_t *ipaddr, u16_t port, altcp_connected_fn connected)
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267 | {
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268 | struct tcp_pcb *pcb;
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269 | if (conn == NULL) {
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270 | return ERR_VAL;
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271 | }
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272 | ALTCP_TCP_ASSERT_CONN(conn);
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273 | conn->connected = connected;
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274 | pcb = (struct tcp_pcb *)conn->state;
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275 | return tcp_connect(pcb, ipaddr, port, altcp_tcp_connected);
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276 | }
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277 |
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278 | static struct altcp_pcb *
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279 | altcp_tcp_listen(struct altcp_pcb *conn, u8_t backlog, err_t *err)
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280 | {
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281 | struct tcp_pcb *pcb;
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282 | struct tcp_pcb *lpcb;
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283 | if (conn == NULL) {
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284 | return NULL;
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285 | }
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286 | ALTCP_TCP_ASSERT_CONN(conn);
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287 | pcb = (struct tcp_pcb *)conn->state;
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288 | lpcb = tcp_listen_with_backlog_and_err(pcb, backlog, err);
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289 | if (lpcb != NULL) {
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290 | conn->state = lpcb;
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291 | tcp_accept(lpcb, altcp_tcp_accept);
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292 | return conn;
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293 | }
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294 | return NULL;
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295 | }
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296 |
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297 | static void
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298 | altcp_tcp_abort(struct altcp_pcb *conn)
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299 | {
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300 | if (conn != NULL) {
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301 | struct tcp_pcb *pcb = (struct tcp_pcb *)conn->state;
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302 | ALTCP_TCP_ASSERT_CONN(conn);
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303 | if (pcb) {
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304 | tcp_abort(pcb);
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305 | }
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306 | }
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307 | }
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308 |
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309 | static err_t
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310 | altcp_tcp_close(struct altcp_pcb *conn)
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311 | {
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312 | struct tcp_pcb *pcb;
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313 | if (conn == NULL) {
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314 | return ERR_VAL;
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315 | }
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316 | ALTCP_TCP_ASSERT_CONN(conn);
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317 | pcb = (struct tcp_pcb *)conn->state;
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318 | if (pcb) {
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319 | err_t err;
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320 | tcp_poll_fn oldpoll = pcb->poll;
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321 | altcp_tcp_remove_callbacks(pcb);
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322 | err = tcp_close(pcb);
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323 | if (err != ERR_OK) {
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324 | /* not closed, set up all callbacks again */
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325 | altcp_tcp_setup_callbacks(conn, pcb);
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326 | /* poll callback is not included in the above */
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327 | tcp_poll(pcb, oldpoll, pcb->pollinterval);
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328 | return err;
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329 | }
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330 | conn->state = NULL; /* unsafe to reference pcb after tcp_close(). */
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331 | }
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332 | altcp_free(conn);
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333 | return ERR_OK;
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334 | }
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335 |
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336 | static err_t
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337 | altcp_tcp_shutdown(struct altcp_pcb *conn, int shut_rx, int shut_tx)
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338 | {
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339 | struct tcp_pcb *pcb;
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340 | if (conn == NULL) {
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341 | return ERR_VAL;
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342 | }
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343 | ALTCP_TCP_ASSERT_CONN(conn);
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344 | pcb = (struct tcp_pcb *)conn->state;
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345 | return tcp_shutdown(pcb, shut_rx, shut_tx);
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346 | }
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347 |
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348 | static err_t
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349 | altcp_tcp_write(struct altcp_pcb *conn, const void *dataptr, u16_t len, u8_t apiflags)
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350 | {
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351 | struct tcp_pcb *pcb;
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352 | if (conn == NULL) {
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353 | return ERR_VAL;
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354 | }
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355 | ALTCP_TCP_ASSERT_CONN(conn);
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356 | pcb = (struct tcp_pcb *)conn->state;
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357 | return tcp_write(pcb, dataptr, len, apiflags);
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358 | }
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359 |
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360 | static err_t
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361 | altcp_tcp_output(struct altcp_pcb *conn)
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362 | {
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363 | struct tcp_pcb *pcb;
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364 | if (conn == NULL) {
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365 | return ERR_VAL;
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366 | }
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367 | ALTCP_TCP_ASSERT_CONN(conn);
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368 | pcb = (struct tcp_pcb *)conn->state;
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369 | return tcp_output(pcb);
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370 | }
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371 |
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372 | static u16_t
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373 | altcp_tcp_mss(struct altcp_pcb *conn)
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374 | {
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375 | struct tcp_pcb *pcb;
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376 | if (conn == NULL) {
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377 | return 0;
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378 | }
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379 | ALTCP_TCP_ASSERT_CONN(conn);
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380 | pcb = (struct tcp_pcb *)conn->state;
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381 | return tcp_mss(pcb);
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382 | }
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383 |
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384 | static u16_t
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385 | altcp_tcp_sndbuf(struct altcp_pcb *conn)
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386 | {
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387 | struct tcp_pcb *pcb;
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388 | if (conn == NULL) {
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389 | return 0;
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390 | }
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391 | ALTCP_TCP_ASSERT_CONN(conn);
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392 | pcb = (struct tcp_pcb *)conn->state;
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393 | return tcp_sndbuf(pcb);
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394 | }
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395 |
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396 | static u16_t
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397 | altcp_tcp_sndqueuelen(struct altcp_pcb *conn)
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398 | {
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399 | struct tcp_pcb *pcb;
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400 | if (conn == NULL) {
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401 | return 0;
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402 | }
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403 | ALTCP_TCP_ASSERT_CONN(conn);
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404 | pcb = (struct tcp_pcb *)conn->state;
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405 | return tcp_sndqueuelen(pcb);
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406 | }
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407 |
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408 | static void
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409 | altcp_tcp_nagle_disable(struct altcp_pcb *conn)
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410 | {
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411 | if (conn && conn->state) {
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412 | struct tcp_pcb *pcb = (struct tcp_pcb *)conn->state;
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413 | ALTCP_TCP_ASSERT_CONN(conn);
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414 | tcp_nagle_disable(pcb);
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415 | }
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416 | }
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417 |
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418 | static void
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419 | altcp_tcp_nagle_enable(struct altcp_pcb *conn)
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420 | {
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421 | if (conn && conn->state) {
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422 | struct tcp_pcb *pcb = (struct tcp_pcb *)conn->state;
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423 | ALTCP_TCP_ASSERT_CONN(conn);
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424 | tcp_nagle_enable(pcb);
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425 | }
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426 | }
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427 |
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428 | static int
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429 | altcp_tcp_nagle_disabled(struct altcp_pcb *conn)
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430 | {
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431 | if (conn && conn->state) {
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432 | struct tcp_pcb *pcb = (struct tcp_pcb *)conn->state;
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433 | ALTCP_TCP_ASSERT_CONN(conn);
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434 | return tcp_nagle_disabled(pcb);
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435 | }
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436 | return 0;
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437 | }
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438 |
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439 | static void
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440 | altcp_tcp_setprio(struct altcp_pcb *conn, u8_t prio)
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441 | {
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442 | if (conn != NULL) {
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443 | struct tcp_pcb *pcb = (struct tcp_pcb *)conn->state;
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444 | ALTCP_TCP_ASSERT_CONN(conn);
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445 | tcp_setprio(pcb, prio);
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446 | }
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447 | }
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448 |
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449 | static void
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450 | altcp_tcp_dealloc(struct altcp_pcb *conn)
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451 | {
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452 | LWIP_UNUSED_ARG(conn);
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453 | ALTCP_TCP_ASSERT_CONN(conn);
|
---|
454 | /* no private state to clean up */
|
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455 | }
|
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456 |
|
---|
457 | static err_t
|
---|
458 | altcp_tcp_get_tcp_addrinfo(struct altcp_pcb *conn, int local, ip_addr_t *addr, u16_t *port)
|
---|
459 | {
|
---|
460 | if (conn) {
|
---|
461 | struct tcp_pcb *pcb = (struct tcp_pcb *)conn->state;
|
---|
462 | ALTCP_TCP_ASSERT_CONN(conn);
|
---|
463 | return tcp_tcp_get_tcp_addrinfo(pcb, local, addr, port);
|
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464 | }
|
---|
465 | return ERR_VAL;
|
---|
466 | }
|
---|
467 |
|
---|
468 | static ip_addr_t *
|
---|
469 | altcp_tcp_get_ip(struct altcp_pcb *conn, int local)
|
---|
470 | {
|
---|
471 | if (conn) {
|
---|
472 | struct tcp_pcb *pcb = (struct tcp_pcb *)conn->state;
|
---|
473 | ALTCP_TCP_ASSERT_CONN(conn);
|
---|
474 | if (pcb) {
|
---|
475 | if (local) {
|
---|
476 | return &pcb->local_ip;
|
---|
477 | } else {
|
---|
478 | return &pcb->remote_ip;
|
---|
479 | }
|
---|
480 | }
|
---|
481 | }
|
---|
482 | return NULL;
|
---|
483 | }
|
---|
484 |
|
---|
485 | static u16_t
|
---|
486 | altcp_tcp_get_port(struct altcp_pcb *conn, int local)
|
---|
487 | {
|
---|
488 | if (conn) {
|
---|
489 | struct tcp_pcb *pcb = (struct tcp_pcb *)conn->state;
|
---|
490 | ALTCP_TCP_ASSERT_CONN(conn);
|
---|
491 | if (pcb) {
|
---|
492 | if (local) {
|
---|
493 | return pcb->local_port;
|
---|
494 | } else {
|
---|
495 | return pcb->remote_port;
|
---|
496 | }
|
---|
497 | }
|
---|
498 | }
|
---|
499 | return 0;
|
---|
500 | }
|
---|
501 |
|
---|
502 | #ifdef LWIP_DEBUG
|
---|
503 | static enum tcp_state
|
---|
504 | altcp_tcp_dbg_get_tcp_state(struct altcp_pcb *conn)
|
---|
505 | {
|
---|
506 | if (conn) {
|
---|
507 | struct tcp_pcb *pcb = (struct tcp_pcb *)conn->state;
|
---|
508 | ALTCP_TCP_ASSERT_CONN(conn);
|
---|
509 | if (pcb) {
|
---|
510 | return pcb->state;
|
---|
511 | }
|
---|
512 | }
|
---|
513 | return CLOSED;
|
---|
514 | }
|
---|
515 | #endif
|
---|
516 | const struct altcp_functions altcp_tcp_functions = {
|
---|
517 | altcp_tcp_set_poll,
|
---|
518 | altcp_tcp_recved,
|
---|
519 | altcp_tcp_bind,
|
---|
520 | altcp_tcp_connect,
|
---|
521 | altcp_tcp_listen,
|
---|
522 | altcp_tcp_abort,
|
---|
523 | altcp_tcp_close,
|
---|
524 | altcp_tcp_shutdown,
|
---|
525 | altcp_tcp_write,
|
---|
526 | altcp_tcp_output,
|
---|
527 | altcp_tcp_mss,
|
---|
528 | altcp_tcp_sndbuf,
|
---|
529 | altcp_tcp_sndqueuelen,
|
---|
530 | altcp_tcp_nagle_disable,
|
---|
531 | altcp_tcp_nagle_enable,
|
---|
532 | altcp_tcp_nagle_disabled,
|
---|
533 | altcp_tcp_setprio,
|
---|
534 | altcp_tcp_dealloc,
|
---|
535 | altcp_tcp_get_tcp_addrinfo,
|
---|
536 | altcp_tcp_get_ip,
|
---|
537 | altcp_tcp_get_port
|
---|
538 | #ifdef LWIP_DEBUG
|
---|
539 | , altcp_tcp_dbg_get_tcp_state
|
---|
540 | #endif
|
---|
541 | };
|
---|
542 |
|
---|
543 | #endif /* LWIP_ALTCP */
|
---|