Ivan Shindev / lwip

V1

Dependents:   EthernetInterface

Fork of lwip by mbed official

core/tcp.c@11:c9233fe7de67, 2013-06-13 (annotated)

Committer:
lemniskata
Date:
Thu Jun 13 20:00:31 2013 +0000
Revision:
11:c9233fe7de67
Parent:
0:51ac1d130fd4 
V1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:51ac1d130fd4 1 /**
mbed_official 0:51ac1d130fd4 2 * @file
mbed_official 0:51ac1d130fd4 3 * Transmission Control Protocol for IP
mbed_official 0:51ac1d130fd4 4 *
mbed_official 0:51ac1d130fd4 5 * This file contains common functions for the TCP implementation, such as functinos
mbed_official 0:51ac1d130fd4 6 * for manipulating the data structures and the TCP timer functions. TCP functions
mbed_official 0:51ac1d130fd4 7 * related to input and output is found in tcp_in.c and tcp_out.c respectively.
mbed_official 0:51ac1d130fd4 8 *
mbed_official 0:51ac1d130fd4 9 */
mbed_official 0:51ac1d130fd4 10
mbed_official 0:51ac1d130fd4 11 /*
mbed_official 0:51ac1d130fd4 12 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
mbed_official 0:51ac1d130fd4 13 * All rights reserved.
mbed_official 0:51ac1d130fd4 14 *
mbed_official 0:51ac1d130fd4 15 * Redistribution and use in source and binary forms, with or without modification,
mbed_official 0:51ac1d130fd4 16 * are permitted provided that the following conditions are met:
mbed_official 0:51ac1d130fd4 17 *
mbed_official 0:51ac1d130fd4 18 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 0:51ac1d130fd4 19 * this list of conditions and the following disclaimer.
mbed_official 0:51ac1d130fd4 20 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 0:51ac1d130fd4 21 * this list of conditions and the following disclaimer in the documentation
mbed_official 0:51ac1d130fd4 22 * and/or other materials provided with the distribution.
mbed_official 0:51ac1d130fd4 23 * 3. The name of the author may not be used to endorse or promote products
mbed_official 0:51ac1d130fd4 24 * derived from this software without specific prior written permission.
mbed_official 0:51ac1d130fd4 25 *
mbed_official 0:51ac1d130fd4 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
mbed_official 0:51ac1d130fd4 27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
mbed_official 0:51ac1d130fd4 28 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
mbed_official 0:51ac1d130fd4 29 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
mbed_official 0:51ac1d130fd4 30 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
mbed_official 0:51ac1d130fd4 31 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mbed_official 0:51ac1d130fd4 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mbed_official 0:51ac1d130fd4 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
mbed_official 0:51ac1d130fd4 34 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
mbed_official 0:51ac1d130fd4 35 * OF SUCH DAMAGE.
mbed_official 0:51ac1d130fd4 36 *
mbed_official 0:51ac1d130fd4 37 * This file is part of the lwIP TCP/IP stack.
mbed_official 0:51ac1d130fd4 38 *
mbed_official 0:51ac1d130fd4 39 * Author: Adam Dunkels <adam@sics.se>
mbed_official 0:51ac1d130fd4 40 *
mbed_official 0:51ac1d130fd4 41 */
mbed_official 0:51ac1d130fd4 42
mbed_official 0:51ac1d130fd4 43 #include "lwip/opt.h"
mbed_official 0:51ac1d130fd4 44
mbed_official 0:51ac1d130fd4 45 #if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
mbed_official 0:51ac1d130fd4 46
mbed_official 0:51ac1d130fd4 47 #include "lwip/def.h"
mbed_official 0:51ac1d130fd4 48 #include "lwip/mem.h"
mbed_official 0:51ac1d130fd4 49 #include "lwip/memp.h"
mbed_official 0:51ac1d130fd4 50 #include "lwip/snmp.h"
mbed_official 0:51ac1d130fd4 51 #include "lwip/tcp.h"
mbed_official 0:51ac1d130fd4 52 #include "lwip/tcp_impl.h"
mbed_official 0:51ac1d130fd4 53 #include "lwip/debug.h"
mbed_official 0:51ac1d130fd4 54 #include "lwip/stats.h"
mbed_official 0:51ac1d130fd4 55
mbed_official 0:51ac1d130fd4 56 #include <string.h>
mbed_official 0:51ac1d130fd4 57
mbed_official 0:51ac1d130fd4 58 const char * const tcp_state_str[] = {
mbed_official 0:51ac1d130fd4 59 "CLOSED",
mbed_official 0:51ac1d130fd4 60 "LISTEN",
mbed_official 0:51ac1d130fd4 61 "SYN_SENT",
mbed_official 0:51ac1d130fd4 62 "SYN_RCVD",
mbed_official 0:51ac1d130fd4 63 "ESTABLISHED",
mbed_official 0:51ac1d130fd4 64 "FIN_WAIT_1",
mbed_official 0:51ac1d130fd4 65 "FIN_WAIT_2",
mbed_official 0:51ac1d130fd4 66 "CLOSE_WAIT",
mbed_official 0:51ac1d130fd4 67 "CLOSING",
mbed_official 0:51ac1d130fd4 68 "LAST_ACK",
mbed_official 0:51ac1d130fd4 69 "TIME_WAIT"
mbed_official 0:51ac1d130fd4 70 };
mbed_official 0:51ac1d130fd4 71
mbed_official 0:51ac1d130fd4 72 /* Incremented every coarse grained timer shot (typically every 500 ms). */
mbed_official 0:51ac1d130fd4 73 u32_t tcp_ticks;
mbed_official 0:51ac1d130fd4 74 const u8_t tcp_backoff[13] =
mbed_official 0:51ac1d130fd4 75 { 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
mbed_official 0:51ac1d130fd4 76 /* Times per slowtmr hits */
mbed_official 0:51ac1d130fd4 77 const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
mbed_official 0:51ac1d130fd4 78
mbed_official 0:51ac1d130fd4 79 /* The TCP PCB lists. */
mbed_official 0:51ac1d130fd4 80
mbed_official 0:51ac1d130fd4 81 /** List of all TCP PCBs bound but not yet (connected || listening) */
mbed_official 0:51ac1d130fd4 82 struct tcp_pcb *tcp_bound_pcbs;
mbed_official 0:51ac1d130fd4 83 /** List of all TCP PCBs in LISTEN state */
mbed_official 0:51ac1d130fd4 84 union tcp_listen_pcbs_t tcp_listen_pcbs;
mbed_official 0:51ac1d130fd4 85 /** List of all TCP PCBs that are in a state in which
mbed_official 0:51ac1d130fd4 86 * they accept or send data. */
mbed_official 0:51ac1d130fd4 87 struct tcp_pcb *tcp_active_pcbs;
mbed_official 0:51ac1d130fd4 88 /** List of all TCP PCBs in TIME-WAIT state */
mbed_official 0:51ac1d130fd4 89 struct tcp_pcb *tcp_tw_pcbs;
mbed_official 0:51ac1d130fd4 90
mbed_official 0:51ac1d130fd4 91 #define NUM_TCP_PCB_LISTS 4
mbed_official 0:51ac1d130fd4 92 #define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
mbed_official 0:51ac1d130fd4 93 /** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
mbed_official 0:51ac1d130fd4 94 struct tcp_pcb ** const tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
mbed_official 0:51ac1d130fd4 95 &tcp_active_pcbs, &tcp_tw_pcbs};
mbed_official 0:51ac1d130fd4 96
mbed_official 0:51ac1d130fd4 97 /** Only used for temporary storage. */
mbed_official 0:51ac1d130fd4 98 struct tcp_pcb *tcp_tmp_pcb;
mbed_official 0:51ac1d130fd4 99
mbed_official 0:51ac1d130fd4 100 /** Timer counter to handle calling slow-timer from tcp_tmr() */
mbed_official 0:51ac1d130fd4 101 static u8_t tcp_timer;
mbed_official 0:51ac1d130fd4 102 static u16_t tcp_new_port(void);
mbed_official 0:51ac1d130fd4 103
mbed_official 0:51ac1d130fd4 104 /**
mbed_official 0:51ac1d130fd4 105 * Called periodically to dispatch TCP timers.
mbed_official 0:51ac1d130fd4 106 *
mbed_official 0:51ac1d130fd4 107 */
mbed_official 0:51ac1d130fd4 108 void
mbed_official 0:51ac1d130fd4 109 tcp_tmr(void)
mbed_official 0:51ac1d130fd4 110 {
mbed_official 0:51ac1d130fd4 111 /* Call tcp_fasttmr() every 250 ms */
mbed_official 0:51ac1d130fd4 112 tcp_fasttmr();
mbed_official 0:51ac1d130fd4 113
mbed_official 0:51ac1d130fd4 114 if (++tcp_timer & 1) {
mbed_official 0:51ac1d130fd4 115 /* Call tcp_tmr() every 500 ms, i.e., every other timer
mbed_official 0:51ac1d130fd4 116 tcp_tmr() is called. */
mbed_official 0:51ac1d130fd4 117 tcp_slowtmr();
mbed_official 0:51ac1d130fd4 118 }
mbed_official 0:51ac1d130fd4 119 }
mbed_official 0:51ac1d130fd4 120
mbed_official 0:51ac1d130fd4 121 /**
mbed_official 0:51ac1d130fd4 122 * Closes the TX side of a connection held by the PCB.
mbed_official 0:51ac1d130fd4 123 * For tcp_close(), a RST is sent if the application didn't receive all data
mbed_official 0:51ac1d130fd4 124 * (tcp_recved() not called for all data passed to recv callback).
mbed_official 0:51ac1d130fd4 125 *
mbed_official 0:51ac1d130fd4 126 * Listening pcbs are freed and may not be referenced any more.
mbed_official 0:51ac1d130fd4 127 * Connection pcbs are freed if not yet connected and may not be referenced
mbed_official 0:51ac1d130fd4 128 * any more. If a connection is established (at least SYN received or in
mbed_official 0:51ac1d130fd4 129 * a closing state), the connection is closed, and put in a closing state.
mbed_official 0:51ac1d130fd4 130 * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
mbed_official 0:51ac1d130fd4 131 * unsafe to reference it.
mbed_official 0:51ac1d130fd4 132 *
mbed_official 0:51ac1d130fd4 133 * @param pcb the tcp_pcb to close
mbed_official 0:51ac1d130fd4 134 * @return ERR_OK if connection has been closed
mbed_official 0:51ac1d130fd4 135 * another err_t if closing failed and pcb is not freed
mbed_official 0:51ac1d130fd4 136 */
mbed_official 0:51ac1d130fd4 137 static err_t
mbed_official 0:51ac1d130fd4 138 tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
mbed_official 0:51ac1d130fd4 139 {
mbed_official 0:51ac1d130fd4 140 err_t err;
mbed_official 0:51ac1d130fd4 141
mbed_official 0:51ac1d130fd4 142 if (rst_on_unacked_data && (pcb->state != LISTEN)) {
mbed_official 0:51ac1d130fd4 143 if ((pcb->refused_data != NULL) || (pcb->rcv_wnd != TCP_WND)) {
mbed_official 0:51ac1d130fd4 144 /* Not all data received by application, send RST to tell the remote
mbed_official 0:51ac1d130fd4 145 side about this. */
mbed_official 0:51ac1d130fd4 146 LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
mbed_official 0:51ac1d130fd4 147
mbed_official 0:51ac1d130fd4 148 /* don't call tcp_abort here: we must not deallocate the pcb since
mbed_official 0:51ac1d130fd4 149 that might not be expected when calling tcp_close */
mbed_official 0:51ac1d130fd4 150 tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
mbed_official 0:51ac1d130fd4 151 pcb->local_port, pcb->remote_port);
mbed_official 0:51ac1d130fd4 152
mbed_official 0:51ac1d130fd4 153 tcp_pcb_purge(pcb);
mbed_official 0:51ac1d130fd4 154
mbed_official 0:51ac1d130fd4 155 /* TODO: to which state do we move now? */
mbed_official 0:51ac1d130fd4 156
mbed_official 0:51ac1d130fd4 157 /* move to TIME_WAIT since we close actively */
mbed_official 0:51ac1d130fd4 158 TCP_RMV(&tcp_active_pcbs, pcb);
mbed_official 0:51ac1d130fd4 159 pcb->state = TIME_WAIT;
mbed_official 0:51ac1d130fd4 160 TCP_REG(&tcp_tw_pcbs, pcb);
mbed_official 0:51ac1d130fd4 161
mbed_official 0:51ac1d130fd4 162 return ERR_OK;
mbed_official 0:51ac1d130fd4 163 }
mbed_official 0:51ac1d130fd4 164 }
mbed_official 0:51ac1d130fd4 165
mbed_official 0:51ac1d130fd4 166 switch (pcb->state) {
mbed_official 0:51ac1d130fd4 167 case CLOSED:
mbed_official 0:51ac1d130fd4 168 /* Closing a pcb in the CLOSED state might seem erroneous,
mbed_official 0:51ac1d130fd4 169 * however, it is in this state once allocated and as yet unused
mbed_official 0:51ac1d130fd4 170 * and the user needs some way to free it should the need arise.
mbed_official 0:51ac1d130fd4 171 * Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
mbed_official 0:51ac1d130fd4 172 * or for a pcb that has been used and then entered the CLOSED state
mbed_official 0:51ac1d130fd4 173 * is erroneous, but this should never happen as the pcb has in those cases
mbed_official 0:51ac1d130fd4 174 * been freed, and so any remaining handles are bogus. */
mbed_official 0:51ac1d130fd4 175 err = ERR_OK;
mbed_official 0:51ac1d130fd4 176 if (pcb->local_port != 0) {
mbed_official 0:51ac1d130fd4 177 TCP_RMV(&tcp_bound_pcbs, pcb);
mbed_official 0:51ac1d130fd4 178 }
mbed_official 0:51ac1d130fd4 179 memp_free(MEMP_TCP_PCB, pcb);
mbed_official 0:51ac1d130fd4 180 pcb = NULL;
mbed_official 0:51ac1d130fd4 181 break;
mbed_official 0:51ac1d130fd4 182 case LISTEN:
mbed_official 0:51ac1d130fd4 183 err = ERR_OK;
mbed_official 0:51ac1d130fd4 184 tcp_pcb_remove(&tcp_listen_pcbs.pcbs, pcb);
mbed_official 0:51ac1d130fd4 185 memp_free(MEMP_TCP_PCB_LISTEN, pcb);
mbed_official 0:51ac1d130fd4 186 pcb = NULL;
mbed_official 0:51ac1d130fd4 187 break;
mbed_official 0:51ac1d130fd4 188 case SYN_SENT:
mbed_official 0:51ac1d130fd4 189 err = ERR_OK;
mbed_official 0:51ac1d130fd4 190 tcp_pcb_remove(&tcp_active_pcbs, pcb);
mbed_official 0:51ac1d130fd4 191 memp_free(MEMP_TCP_PCB, pcb);
mbed_official 0:51ac1d130fd4 192 pcb = NULL;
mbed_official 0:51ac1d130fd4 193 snmp_inc_tcpattemptfails();
mbed_official 0:51ac1d130fd4 194 break;
mbed_official 0:51ac1d130fd4 195 case SYN_RCVD:
mbed_official 0:51ac1d130fd4 196 err = tcp_send_fin(pcb);
mbed_official 0:51ac1d130fd4 197 if (err == ERR_OK) {
mbed_official 0:51ac1d130fd4 198 snmp_inc_tcpattemptfails();
mbed_official 0:51ac1d130fd4 199 pcb->state = FIN_WAIT_1;
mbed_official 0:51ac1d130fd4 200 }
mbed_official 0:51ac1d130fd4 201 break;
mbed_official 0:51ac1d130fd4 202 case ESTABLISHED:
mbed_official 0:51ac1d130fd4 203 err = tcp_send_fin(pcb);
mbed_official 0:51ac1d130fd4 204 if (err == ERR_OK) {
mbed_official 0:51ac1d130fd4 205 snmp_inc_tcpestabresets();
mbed_official 0:51ac1d130fd4 206 pcb->state = FIN_WAIT_1;
mbed_official 0:51ac1d130fd4 207 }
mbed_official 0:51ac1d130fd4 208 break;
mbed_official 0:51ac1d130fd4 209 case CLOSE_WAIT:
mbed_official 0:51ac1d130fd4 210 err = tcp_send_fin(pcb);
mbed_official 0:51ac1d130fd4 211 if (err == ERR_OK) {
mbed_official 0:51ac1d130fd4 212 snmp_inc_tcpestabresets();
mbed_official 0:51ac1d130fd4 213 pcb->state = LAST_ACK;
mbed_official 0:51ac1d130fd4 214 }
mbed_official 0:51ac1d130fd4 215 break;
mbed_official 0:51ac1d130fd4 216 default:
mbed_official 0:51ac1d130fd4 217 /* Has already been closed, do nothing. */
mbed_official 0:51ac1d130fd4 218 err = ERR_OK;
mbed_official 0:51ac1d130fd4 219 pcb = NULL;
mbed_official 0:51ac1d130fd4 220 break;
mbed_official 0:51ac1d130fd4 221 }
mbed_official 0:51ac1d130fd4 222
mbed_official 0:51ac1d130fd4 223 if (pcb != NULL && err == ERR_OK) {
mbed_official 0:51ac1d130fd4 224 /* To ensure all data has been sent when tcp_close returns, we have
mbed_official 0:51ac1d130fd4 225 to make sure tcp_output doesn't fail.
mbed_official 0:51ac1d130fd4 226 Since we don't really have to ensure all data has been sent when tcp_close
mbed_official 0:51ac1d130fd4 227 returns (unsent data is sent from tcp timer functions, also), we don't care
mbed_official 0:51ac1d130fd4 228 for the return value of tcp_output for now. */
mbed_official 0:51ac1d130fd4 229 /* @todo: When implementing SO_LINGER, this must be changed somehow:
mbed_official 0:51ac1d130fd4 230 If SOF_LINGER is set, the data should be sent and acked before close returns.
mbed_official 0:51ac1d130fd4 231 This can only be valid for sequential APIs, not for the raw API. */
mbed_official 0:51ac1d130fd4 232 tcp_output(pcb);
mbed_official 0:51ac1d130fd4 233 }
mbed_official 0:51ac1d130fd4 234 return err;
mbed_official 0:51ac1d130fd4 235 }
mbed_official 0:51ac1d130fd4 236
mbed_official 0:51ac1d130fd4 237 /**
mbed_official 0:51ac1d130fd4 238 * Closes the connection held by the PCB.
mbed_official 0:51ac1d130fd4 239 *
mbed_official 0:51ac1d130fd4 240 * Listening pcbs are freed and may not be referenced any more.
mbed_official 0:51ac1d130fd4 241 * Connection pcbs are freed if not yet connected and may not be referenced
mbed_official 0:51ac1d130fd4 242 * any more. If a connection is established (at least SYN received or in
mbed_official 0:51ac1d130fd4 243 * a closing state), the connection is closed, and put in a closing state.
mbed_official 0:51ac1d130fd4 244 * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
mbed_official 0:51ac1d130fd4 245 * unsafe to reference it (unless an error is returned).
mbed_official 0:51ac1d130fd4 246 *
mbed_official 0:51ac1d130fd4 247 * @param pcb the tcp_pcb to close
mbed_official 0:51ac1d130fd4 248 * @return ERR_OK if connection has been closed
mbed_official 0:51ac1d130fd4 249 * another err_t if closing failed and pcb is not freed
mbed_official 0:51ac1d130fd4 250 */
mbed_official 0:51ac1d130fd4 251 err_t
mbed_official 0:51ac1d130fd4 252 tcp_close(struct tcp_pcb *pcb)
mbed_official 0:51ac1d130fd4 253 {
mbed_official 0:51ac1d130fd4 254 #if TCP_DEBUG
mbed_official 0:51ac1d130fd4 255 LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
mbed_official 0:51ac1d130fd4 256 tcp_debug_print_state(pcb->state);
mbed_official 0:51ac1d130fd4 257 #endif /* TCP_DEBUG */
mbed_official 0:51ac1d130fd4 258
mbed_official 0:51ac1d130fd4 259 if (pcb->state != LISTEN) {
mbed_official 0:51ac1d130fd4 260 /* Set a flag not to receive any more data... */
mbed_official 0:51ac1d130fd4 261 pcb->flags |= TF_RXCLOSED;
mbed_official 0:51ac1d130fd4 262 }
mbed_official 0:51ac1d130fd4 263 /* ... and close */
mbed_official 0:51ac1d130fd4 264 return tcp_close_shutdown(pcb, 1);
mbed_official 0:51ac1d130fd4 265 }
mbed_official 0:51ac1d130fd4 266
mbed_official 0:51ac1d130fd4 267 /**
mbed_official 0:51ac1d130fd4 268 * Causes all or part of a full-duplex connection of this PCB to be shut down.
mbed_official 0:51ac1d130fd4 269 * This doesn't deallocate the PCB!
mbed_official 0:51ac1d130fd4 270 *
mbed_official 0:51ac1d130fd4 271 * @param pcb PCB to shutdown
mbed_official 0:51ac1d130fd4 272 * @param shut_rx shut down receive side if this is != 0
mbed_official 0:51ac1d130fd4 273 * @param shut_tx shut down send side if this is != 0
mbed_official 0:51ac1d130fd4 274 * @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
mbed_official 0:51ac1d130fd4 275 * another err_t on error.
mbed_official 0:51ac1d130fd4 276 */
mbed_official 0:51ac1d130fd4 277 err_t
mbed_official 0:51ac1d130fd4 278 tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
mbed_official 0:51ac1d130fd4 279 {
mbed_official 0:51ac1d130fd4 280 if (pcb->state == LISTEN) {
mbed_official 0:51ac1d130fd4 281 return ERR_CONN;
mbed_official 0:51ac1d130fd4 282 }
mbed_official 0:51ac1d130fd4 283 if (shut_rx) {
mbed_official 0:51ac1d130fd4 284 /* shut down the receive side: free buffered data... */
mbed_official 0:51ac1d130fd4 285 if (pcb->refused_data != NULL) {
mbed_official 0:51ac1d130fd4 286 pbuf_free(pcb->refused_data);
mbed_official 0:51ac1d130fd4 287 pcb->refused_data = NULL;
mbed_official 0:51ac1d130fd4 288 }
mbed_official 0:51ac1d130fd4 289 /* ... and set a flag not to receive any more data */
mbed_official 0:51ac1d130fd4 290 pcb->flags |= TF_RXCLOSED;
mbed_official 0:51ac1d130fd4 291 }
mbed_official 0:51ac1d130fd4 292 if (shut_tx) {
mbed_official 0:51ac1d130fd4 293 /* This can't happen twice since if it succeeds, the pcb's state is changed.
mbed_official 0:51ac1d130fd4 294 Only close in these states as the others directly deallocate the PCB */
mbed_official 0:51ac1d130fd4 295 switch (pcb->state) {
mbed_official 0:51ac1d130fd4 296 case SYN_RCVD:
mbed_official 0:51ac1d130fd4 297 case ESTABLISHED:
mbed_official 0:51ac1d130fd4 298 case CLOSE_WAIT:
mbed_official 0:51ac1d130fd4 299 return tcp_close_shutdown(pcb, 0);
mbed_official 0:51ac1d130fd4 300 default:
mbed_official 0:51ac1d130fd4 301 /* don't shut down other states */
mbed_official 0:51ac1d130fd4 302 break;
mbed_official 0:51ac1d130fd4 303 }
mbed_official 0:51ac1d130fd4 304 }
mbed_official 0:51ac1d130fd4 305 /* @todo: return another err_t if not in correct state or already shut? */
mbed_official 0:51ac1d130fd4 306 return ERR_OK;
mbed_official 0:51ac1d130fd4 307 }
mbed_official 0:51ac1d130fd4 308
mbed_official 0:51ac1d130fd4 309 /**
mbed_official 0:51ac1d130fd4 310 * Abandons a connection and optionally sends a RST to the remote
mbed_official 0:51ac1d130fd4 311 * host. Deletes the local protocol control block. This is done when
mbed_official 0:51ac1d130fd4 312 * a connection is killed because of shortage of memory.
mbed_official 0:51ac1d130fd4 313 *
mbed_official 0:51ac1d130fd4 314 * @param pcb the tcp_pcb to abort
mbed_official 0:51ac1d130fd4 315 * @param reset boolean to indicate whether a reset should be sent
mbed_official 0:51ac1d130fd4 316 */
mbed_official 0:51ac1d130fd4 317 void
mbed_official 0:51ac1d130fd4 318 tcp_abandon(struct tcp_pcb *pcb, int reset)
mbed_official 0:51ac1d130fd4 319 {
mbed_official 0:51ac1d130fd4 320 u32_t seqno, ackno;
mbed_official 0:51ac1d130fd4 321 u16_t remote_port, local_port;
mbed_official 0:51ac1d130fd4 322 ip_addr_t remote_ip, local_ip;
mbed_official 0:51ac1d130fd4 323 #if LWIP_CALLBACK_API
mbed_official 0:51ac1d130fd4 324 tcp_err_fn errf;
mbed_official 0:51ac1d130fd4 325 #endif /* LWIP_CALLBACK_API */
mbed_official 0:51ac1d130fd4 326 void *errf_arg;
mbed_official 0:51ac1d130fd4 327
mbed_official 0:51ac1d130fd4 328 /* pcb->state LISTEN not allowed here */
mbed_official 0:51ac1d130fd4 329 LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
mbed_official 0:51ac1d130fd4 330 pcb->state != LISTEN);
mbed_official 0:51ac1d130fd4 331 /* Figure out on which TCP PCB list we are, and remove us. If we
mbed_official 0:51ac1d130fd4 332 are in an active state, call the receive function associated with
mbed_official 0:51ac1d130fd4 333 the PCB with a NULL argument, and send an RST to the remote end. */
mbed_official 0:51ac1d130fd4 334 if (pcb->state == TIME_WAIT) {
mbed_official 0:51ac1d130fd4 335 tcp_pcb_remove(&tcp_tw_pcbs, pcb);
mbed_official 0:51ac1d130fd4 336 memp_free(MEMP_TCP_PCB, pcb);
mbed_official 0:51ac1d130fd4 337 } else {
mbed_official 0:51ac1d130fd4 338 seqno = pcb->snd_nxt;
mbed_official 0:51ac1d130fd4 339 ackno = pcb->rcv_nxt;
mbed_official 0:51ac1d130fd4 340 ip_addr_copy(local_ip, pcb->local_ip);
mbed_official 0:51ac1d130fd4 341 ip_addr_copy(remote_ip, pcb->remote_ip);
mbed_official 0:51ac1d130fd4 342 local_port = pcb->local_port;
mbed_official 0:51ac1d130fd4 343 remote_port = pcb->remote_port;
mbed_official 0:51ac1d130fd4 344 #if LWIP_CALLBACK_API
mbed_official 0:51ac1d130fd4 345 errf = pcb->errf;
mbed_official 0:51ac1d130fd4 346 #endif /* LWIP_CALLBACK_API */
mbed_official 0:51ac1d130fd4 347 errf_arg = pcb->callback_arg;
mbed_official 0:51ac1d130fd4 348 tcp_pcb_remove(&tcp_active_pcbs, pcb);
mbed_official 0:51ac1d130fd4 349 if (pcb->unacked != NULL) {
mbed_official 0:51ac1d130fd4 350 tcp_segs_free(pcb->unacked);
mbed_official 0:51ac1d130fd4 351 }
mbed_official 0:51ac1d130fd4 352 if (pcb->unsent != NULL) {
mbed_official 0:51ac1d130fd4 353 tcp_segs_free(pcb->unsent);
mbed_official 0:51ac1d130fd4 354 }
mbed_official 0:51ac1d130fd4 355 #if TCP_QUEUE_OOSEQ
mbed_official 0:51ac1d130fd4 356 if (pcb->ooseq != NULL) {
mbed_official 0:51ac1d130fd4 357 tcp_segs_free(pcb->ooseq);
mbed_official 0:51ac1d130fd4 358 }
mbed_official 0:51ac1d130fd4 359 #endif /* TCP_QUEUE_OOSEQ */
mbed_official 0:51ac1d130fd4 360 memp_free(MEMP_TCP_PCB, pcb);
mbed_official 0:51ac1d130fd4 361 TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
mbed_official 0:51ac1d130fd4 362 if (reset) {
mbed_official 0:51ac1d130fd4 363 LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
mbed_official 0:51ac1d130fd4 364 tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port);
mbed_official 0:51ac1d130fd4 365 }
mbed_official 0:51ac1d130fd4 366 }
mbed_official 0:51ac1d130fd4 367 }
mbed_official 0:51ac1d130fd4 368
mbed_official 0:51ac1d130fd4 369 /**
mbed_official 0:51ac1d130fd4 370 * Aborts the connection by sending a RST (reset) segment to the remote
mbed_official 0:51ac1d130fd4 371 * host. The pcb is deallocated. This function never fails.
mbed_official 0:51ac1d130fd4 372 *
mbed_official 0:51ac1d130fd4 373 * ATTENTION: When calling this from one of the TCP callbacks, make
mbed_official 0:51ac1d130fd4 374 * sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
mbed_official 0:51ac1d130fd4 375 * or you will risk accessing deallocated memory or memory leaks!
mbed_official 0:51ac1d130fd4 376 *
mbed_official 0:51ac1d130fd4 377 * @param pcb the tcp pcb to abort
mbed_official 0:51ac1d130fd4 378 */
mbed_official 0:51ac1d130fd4 379 void
mbed_official 0:51ac1d130fd4 380 tcp_abort(struct tcp_pcb *pcb)
mbed_official 0:51ac1d130fd4 381 {
mbed_official 0:51ac1d130fd4 382 tcp_abandon(pcb, 1);
mbed_official 0:51ac1d130fd4 383 }
mbed_official 0:51ac1d130fd4 384
mbed_official 0:51ac1d130fd4 385 /**
mbed_official 0:51ac1d130fd4 386 * Binds the connection to a local portnumber and IP address. If the
mbed_official 0:51ac1d130fd4 387 * IP address is not given (i.e., ipaddr == NULL), the IP address of
mbed_official 0:51ac1d130fd4 388 * the outgoing network interface is used instead.
mbed_official 0:51ac1d130fd4 389 *
mbed_official 0:51ac1d130fd4 390 * @param pcb the tcp_pcb to bind (no check is done whether this pcb is
mbed_official 0:51ac1d130fd4 391 * already bound!)
mbed_official 0:51ac1d130fd4 392 * @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
mbed_official 0:51ac1d130fd4 393 * to any local address
mbed_official 0:51ac1d130fd4 394 * @param port the local port to bind to
mbed_official 0:51ac1d130fd4 395 * @return ERR_USE if the port is already in use
mbed_official 0:51ac1d130fd4 396 * ERR_VAL if bind failed because the PCB is not in a valid state
mbed_official 0:51ac1d130fd4 397 * ERR_OK if bound
mbed_official 0:51ac1d130fd4 398 */
mbed_official 0:51ac1d130fd4 399 err_t
mbed_official 0:51ac1d130fd4 400 tcp_bind(struct tcp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
mbed_official 0:51ac1d130fd4 401 {
mbed_official 0:51ac1d130fd4 402 int i;
mbed_official 0:51ac1d130fd4 403 int max_pcb_list = NUM_TCP_PCB_LISTS;
mbed_official 0:51ac1d130fd4 404 struct tcp_pcb *cpcb;
mbed_official 0:51ac1d130fd4 405
mbed_official 0:51ac1d130fd4 406 LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_VAL);
mbed_official 0:51ac1d130fd4 407
mbed_official 0:51ac1d130fd4 408 #if SO_REUSE
mbed_official 0:51ac1d130fd4 409 /* Unless the REUSEADDR flag is set,
mbed_official 0:51ac1d130fd4 410 we have to check the pcbs in TIME-WAIT state, also.
mbed_official 0:51ac1d130fd4 411 We do not dump TIME_WAIT pcb's; they can still be matched by incoming
mbed_official 0:51ac1d130fd4 412 packets using both local and remote IP addresses and ports to distinguish.
mbed_official 0:51ac1d130fd4 413 */
mbed_official 0:51ac1d130fd4 414 if ((pcb->so_options & SOF_REUSEADDR) != 0) {
mbed_official 0:51ac1d130fd4 415 max_pcb_list = NUM_TCP_PCB_LISTS_NO_TIME_WAIT;
mbed_official 0:51ac1d130fd4 416 }
mbed_official 0:51ac1d130fd4 417 #endif /* SO_REUSE */
mbed_official 0:51ac1d130fd4 418
mbed_official 0:51ac1d130fd4 419 if (port == 0) {
mbed_official 0:51ac1d130fd4 420 port = tcp_new_port();
mbed_official 0:51ac1d130fd4 421 }
mbed_official 0:51ac1d130fd4 422
mbed_official 0:51ac1d130fd4 423 /* Check if the address already is in use (on all lists) */
mbed_official 0:51ac1d130fd4 424 for (i = 0; i < max_pcb_list; i++) {
mbed_official 0:51ac1d130fd4 425 for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
mbed_official 0:51ac1d130fd4 426 if (cpcb->local_port == port) {
mbed_official 0:51ac1d130fd4 427 #if SO_REUSE
mbed_official 0:51ac1d130fd4 428 /* Omit checking for the same port if both pcbs have REUSEADDR set.
mbed_official 0:51ac1d130fd4 429 For SO_REUSEADDR, the duplicate-check for a 5-tuple is done in
mbed_official 0:51ac1d130fd4 430 tcp_connect. */
mbed_official 0:51ac1d130fd4 431 if (((pcb->so_options & SOF_REUSEADDR) == 0) ||
mbed_official 0:51ac1d130fd4 432 ((cpcb->so_options & SOF_REUSEADDR) == 0))
mbed_official 0:51ac1d130fd4 433 #endif /* SO_REUSE */
mbed_official 0:51ac1d130fd4 434 {
mbed_official 0:51ac1d130fd4 435 if (ip_addr_isany(&(cpcb->local_ip)) ||
mbed_official 0:51ac1d130fd4 436 ip_addr_isany(ipaddr) ||
mbed_official 0:51ac1d130fd4 437 ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
mbed_official 0:51ac1d130fd4 438 return ERR_USE;
mbed_official 0:51ac1d130fd4 439 }
mbed_official 0:51ac1d130fd4 440 }
mbed_official 0:51ac1d130fd4 441 }
mbed_official 0:51ac1d130fd4 442 }
mbed_official 0:51ac1d130fd4 443 }
mbed_official 0:51ac1d130fd4 444
mbed_official 0:51ac1d130fd4 445 if (!ip_addr_isany(ipaddr)) {
mbed_official 0:51ac1d130fd4 446 pcb->local_ip = *ipaddr;
mbed_official 0:51ac1d130fd4 447 }
mbed_official 0:51ac1d130fd4 448 pcb->local_port = port;
mbed_official 0:51ac1d130fd4 449 TCP_REG(&tcp_bound_pcbs, pcb);
mbed_official 0:51ac1d130fd4 450 LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
mbed_official 0:51ac1d130fd4 451 return ERR_OK;
mbed_official 0:51ac1d130fd4 452 }
mbed_official 0:51ac1d130fd4 453 #if LWIP_CALLBACK_API
mbed_official 0:51ac1d130fd4 454 /**
mbed_official 0:51ac1d130fd4 455 * Default accept callback if no accept callback is specified by the user.
mbed_official 0:51ac1d130fd4 456 */
mbed_official 0:51ac1d130fd4 457 static err_t
mbed_official 0:51ac1d130fd4 458 tcp_accept_null(void *arg, struct tcp_pcb *pcb, err_t err)
mbed_official 0:51ac1d130fd4 459 {
mbed_official 0:51ac1d130fd4 460 LWIP_UNUSED_ARG(arg);
mbed_official 0:51ac1d130fd4 461 LWIP_UNUSED_ARG(pcb);
mbed_official 0:51ac1d130fd4 462 LWIP_UNUSED_ARG(err);
mbed_official 0:51ac1d130fd4 463
mbed_official 0:51ac1d130fd4 464 return ERR_ABRT;
mbed_official 0:51ac1d130fd4 465 }
mbed_official 0:51ac1d130fd4 466 #endif /* LWIP_CALLBACK_API */
mbed_official 0:51ac1d130fd4 467
mbed_official 0:51ac1d130fd4 468 /**
mbed_official 0:51ac1d130fd4 469 * Set the state of the connection to be LISTEN, which means that it
mbed_official 0:51ac1d130fd4 470 * is able to accept incoming connections. The protocol control block
mbed_official 0:51ac1d130fd4 471 * is reallocated in order to consume less memory. Setting the
mbed_official 0:51ac1d130fd4 472 * connection to LISTEN is an irreversible process.
mbed_official 0:51ac1d130fd4 473 *
mbed_official 0:51ac1d130fd4 474 * @param pcb the original tcp_pcb
mbed_official 0:51ac1d130fd4 475 * @param backlog the incoming connections queue limit
mbed_official 0:51ac1d130fd4 476 * @return tcp_pcb used for listening, consumes less memory.
mbed_official 0:51ac1d130fd4 477 *
mbed_official 0:51ac1d130fd4 478 * @note The original tcp_pcb is freed. This function therefore has to be
mbed_official 0:51ac1d130fd4 479 * called like this:
mbed_official 0:51ac1d130fd4 480 * tpcb = tcp_listen(tpcb);
mbed_official 0:51ac1d130fd4 481 */
mbed_official 0:51ac1d130fd4 482 struct tcp_pcb *
mbed_official 0:51ac1d130fd4 483 tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
mbed_official 0:51ac1d130fd4 484 {
mbed_official 0:51ac1d130fd4 485 struct tcp_pcb_listen *lpcb;
mbed_official 0:51ac1d130fd4 486
mbed_official 0:51ac1d130fd4 487 LWIP_UNUSED_ARG(backlog);
mbed_official 0:51ac1d130fd4 488 LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL);
mbed_official 0:51ac1d130fd4 489
mbed_official 0:51ac1d130fd4 490 /* already listening? */
mbed_official 0:51ac1d130fd4 491 if (pcb->state == LISTEN) {
mbed_official 0:51ac1d130fd4 492 return pcb;
mbed_official 0:51ac1d130fd4 493 }
mbed_official 0:51ac1d130fd4 494 #if SO_REUSE
mbed_official 0:51ac1d130fd4 495 if ((pcb->so_options & SOF_REUSEADDR) != 0) {
mbed_official 0:51ac1d130fd4 496 /* Since SOF_REUSEADDR allows reusing a local address before the pcb's usage
mbed_official 0:51ac1d130fd4 497 is declared (listen-/connection-pcb), we have to make sure now that
mbed_official 0:51ac1d130fd4 498 this port is only used once for every local IP. */
mbed_official 0:51ac1d130fd4 499 for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
mbed_official 0:51ac1d130fd4 500 if (lpcb->local_port == pcb->local_port) {
mbed_official 0:51ac1d130fd4 501 if (ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
mbed_official 0:51ac1d130fd4 502 /* this address/port is already used */
mbed_official 0:51ac1d130fd4 503 return NULL;
mbed_official 0:51ac1d130fd4 504 }
mbed_official 0:51ac1d130fd4 505 }
mbed_official 0:51ac1d130fd4 506 }
mbed_official 0:51ac1d130fd4 507 }
mbed_official 0:51ac1d130fd4 508 #endif /* SO_REUSE */
mbed_official 0:51ac1d130fd4 509 lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
mbed_official 0:51ac1d130fd4 510 if (lpcb == NULL) {
mbed_official 0:51ac1d130fd4 511 return NULL;
mbed_official 0:51ac1d130fd4 512 }
mbed_official 0:51ac1d130fd4 513 lpcb->callback_arg = pcb->callback_arg;
mbed_official 0:51ac1d130fd4 514 lpcb->local_port = pcb->local_port;
mbed_official 0:51ac1d130fd4 515 lpcb->state = LISTEN;
mbed_official 0:51ac1d130fd4 516 lpcb->prio = pcb->prio;
mbed_official 0:51ac1d130fd4 517 lpcb->so_options = pcb->so_options;
mbed_official 0:51ac1d130fd4 518 lpcb->so_options |= SOF_ACCEPTCONN;
mbed_official 0:51ac1d130fd4 519 lpcb->ttl = pcb->ttl;
mbed_official 0:51ac1d130fd4 520 lpcb->tos = pcb->tos;
mbed_official 0:51ac1d130fd4 521 ip_addr_copy(lpcb->local_ip, pcb->local_ip);
mbed_official 0:51ac1d130fd4 522 if (pcb->local_port != 0) {
mbed_official 0:51ac1d130fd4 523 TCP_RMV(&tcp_bound_pcbs, pcb);
mbed_official 0:51ac1d130fd4 524 }
mbed_official 0:51ac1d130fd4 525 memp_free(MEMP_TCP_PCB, pcb);
mbed_official 0:51ac1d130fd4 526 #if LWIP_CALLBACK_API
mbed_official 0:51ac1d130fd4 527 lpcb->accept = tcp_accept_null;
mbed_official 0:51ac1d130fd4 528 #endif /* LWIP_CALLBACK_API */
mbed_official 0:51ac1d130fd4 529 #if TCP_LISTEN_BACKLOG
mbed_official 0:51ac1d130fd4 530 lpcb->accepts_pending = 0;
mbed_official 0:51ac1d130fd4 531 lpcb->backlog = (backlog ? backlog : 1);
mbed_official 0:51ac1d130fd4 532 #endif /* TCP_LISTEN_BACKLOG */
mbed_official 0:51ac1d130fd4 533 TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
mbed_official 0:51ac1d130fd4 534 return (struct tcp_pcb *)lpcb;
mbed_official 0:51ac1d130fd4 535 }
mbed_official 0:51ac1d130fd4 536
mbed_official 0:51ac1d130fd4 537 /**
mbed_official 0:51ac1d130fd4 538 * Update the state that tracks the available window space to advertise.
mbed_official 0:51ac1d130fd4 539 *
mbed_official 0:51ac1d130fd4 540 * Returns how much extra window would be advertised if we sent an
mbed_official 0:51ac1d130fd4 541 * update now.
mbed_official 0:51ac1d130fd4 542 */
mbed_official 0:51ac1d130fd4 543 u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
mbed_official 0:51ac1d130fd4 544 {
mbed_official 0:51ac1d130fd4 545 u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
mbed_official 0:51ac1d130fd4 546
mbed_official 0:51ac1d130fd4 547 if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) {
mbed_official 0:51ac1d130fd4 548 /* we can advertise more window */
mbed_official 0:51ac1d130fd4 549 pcb->rcv_ann_wnd = pcb->rcv_wnd;
mbed_official 0:51ac1d130fd4 550 return new_right_edge - pcb->rcv_ann_right_edge;
mbed_official 0:51ac1d130fd4 551 } else {
mbed_official 0:51ac1d130fd4 552 if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
mbed_official 0:51ac1d130fd4 553 /* Can happen due to other end sending out of advertised window,
mbed_official 0:51ac1d130fd4 554 * but within actual available (but not yet advertised) window */
mbed_official 0:51ac1d130fd4 555 pcb->rcv_ann_wnd = 0;
mbed_official 0:51ac1d130fd4 556 } else {
mbed_official 0:51ac1d130fd4 557 /* keep the right edge of window constant */
mbed_official 0:51ac1d130fd4 558 u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
mbed_official 0:51ac1d130fd4 559 LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff", new_rcv_ann_wnd <= 0xffff);
mbed_official 0:51ac1d130fd4 560 pcb->rcv_ann_wnd = (u16_t)new_rcv_ann_wnd;
mbed_official 0:51ac1d130fd4 561 }
mbed_official 0:51ac1d130fd4 562 return 0;
mbed_official 0:51ac1d130fd4 563 }
mbed_official 0:51ac1d130fd4 564 }
mbed_official 0:51ac1d130fd4 565
mbed_official 0:51ac1d130fd4 566 /**
mbed_official 0:51ac1d130fd4 567 * This function should be called by the application when it has
mbed_official 0:51ac1d130fd4 568 * processed the data. The purpose is to advertise a larger window
mbed_official 0:51ac1d130fd4 569 * when the data has been processed.
mbed_official 0:51ac1d130fd4 570 *
mbed_official 0:51ac1d130fd4 571 * @param pcb the tcp_pcb for which data is read
mbed_official 0:51ac1d130fd4 572 * @param len the amount of bytes that have been read by the application
mbed_official 0:51ac1d130fd4 573 */
mbed_official 0:51ac1d130fd4 574 void
mbed_official 0:51ac1d130fd4 575 tcp_recved(struct tcp_pcb *pcb, u16_t len)
mbed_official 0:51ac1d130fd4 576 {
mbed_official 0:51ac1d130fd4 577 int wnd_inflation;
mbed_official 0:51ac1d130fd4 578
mbed_official 0:51ac1d130fd4 579 LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
mbed_official 0:51ac1d130fd4 580 len <= 0xffff - pcb->rcv_wnd );
mbed_official 0:51ac1d130fd4 581
mbed_official 0:51ac1d130fd4 582 pcb->rcv_wnd += len;
mbed_official 0:51ac1d130fd4 583 if (pcb->rcv_wnd > TCP_WND) {
mbed_official 0:51ac1d130fd4 584 pcb->rcv_wnd = TCP_WND;
mbed_official 0:51ac1d130fd4 585 }
mbed_official 0:51ac1d130fd4 586
mbed_official 0:51ac1d130fd4 587 wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
mbed_official 0:51ac1d130fd4 588
mbed_official 0:51ac1d130fd4 589 /* If the change in the right edge of window is significant (default
mbed_official 0:51ac1d130fd4 590 * watermark is TCP_WND/4), then send an explicit update now.
mbed_official 0:51ac1d130fd4 591 * Otherwise wait for a packet to be sent in the normal course of
mbed_official 0:51ac1d130fd4 592 * events (or more window to be available later) */
mbed_official 0:51ac1d130fd4 593 if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
mbed_official 0:51ac1d130fd4 594 tcp_ack_now(pcb);
mbed_official 0:51ac1d130fd4 595 tcp_output(pcb);
mbed_official 0:51ac1d130fd4 596 }
mbed_official 0:51ac1d130fd4 597
mbed_official 0:51ac1d130fd4 598 LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
mbed_official 0:51ac1d130fd4 599 len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
mbed_official 0:51ac1d130fd4 600 }
mbed_official 0:51ac1d130fd4 601
mbed_official 0:51ac1d130fd4 602 /**
mbed_official 0:51ac1d130fd4 603 * A nastly hack featuring 'goto' statements that allocates a
mbed_official 0:51ac1d130fd4 604 * new TCP local port.
mbed_official 0:51ac1d130fd4 605 *
mbed_official 0:51ac1d130fd4 606 * @return a new (free) local TCP port number
mbed_official 0:51ac1d130fd4 607 */
mbed_official 0:51ac1d130fd4 608 static u16_t
mbed_official 0:51ac1d130fd4 609 tcp_new_port(void)
mbed_official 0:51ac1d130fd4 610 {
mbed_official 0:51ac1d130fd4 611 int i;
mbed_official 0:51ac1d130fd4 612 struct tcp_pcb *pcb;
mbed_official 0:51ac1d130fd4 613 #ifndef TCP_LOCAL_PORT_RANGE_START
mbed_official 0:51ac1d130fd4 614 /* From http://www.iana.org/assignments/port-numbers:
mbed_official 0:51ac1d130fd4 615 "The Dynamic and/or Private Ports are those from 49152 through 65535" */
mbed_official 0:51ac1d130fd4 616 #define TCP_LOCAL_PORT_RANGE_START 0xc000
mbed_official 0:51ac1d130fd4 617 #define TCP_LOCAL_PORT_RANGE_END 0xffff
mbed_official 0:51ac1d130fd4 618 #endif
mbed_official 0:51ac1d130fd4 619 static u16_t port = TCP_LOCAL_PORT_RANGE_START;
mbed_official 0:51ac1d130fd4 620
mbed_official 0:51ac1d130fd4 621 again:
mbed_official 0:51ac1d130fd4 622 if (port++ >= TCP_LOCAL_PORT_RANGE_END) {
mbed_official 0:51ac1d130fd4 623 port = TCP_LOCAL_PORT_RANGE_START;
mbed_official 0:51ac1d130fd4 624 }
mbed_official 0:51ac1d130fd4 625 /* Check all PCB lists. */
mbed_official 0:51ac1d130fd4 626 for (i = 0; i < NUM_TCP_PCB_LISTS; i++) {
mbed_official 0:51ac1d130fd4 627 for(pcb = *tcp_pcb_lists[i]; pcb != NULL; pcb = pcb->next) {
mbed_official 0:51ac1d130fd4 628 if (pcb->local_port == port) {
mbed_official 0:51ac1d130fd4 629 goto again;
mbed_official 0:51ac1d130fd4 630 }
mbed_official 0:51ac1d130fd4 631 }
mbed_official 0:51ac1d130fd4 632 }
mbed_official 0:51ac1d130fd4 633 return port;
mbed_official 0:51ac1d130fd4 634 }
mbed_official 0:51ac1d130fd4 635
mbed_official 0:51ac1d130fd4 636 /**
mbed_official 0:51ac1d130fd4 637 * Connects to another host. The function given as the "connected"
mbed_official 0:51ac1d130fd4 638 * argument will be called when the connection has been established.
mbed_official 0:51ac1d130fd4 639 *
mbed_official 0:51ac1d130fd4 640 * @param pcb the tcp_pcb used to establish the connection
mbed_official 0:51ac1d130fd4 641 * @param ipaddr the remote ip address to connect to
mbed_official 0:51ac1d130fd4 642 * @param port the remote tcp port to connect to
mbed_official 0:51ac1d130fd4 643 * @param connected callback function to call when connected (or on error)
mbed_official 0:51ac1d130fd4 644 * @return ERR_VAL if invalid arguments are given
mbed_official 0:51ac1d130fd4 645 * ERR_OK if connect request has been sent
mbed_official 0:51ac1d130fd4 646 * other err_t values if connect request couldn't be sent
mbed_official 0:51ac1d130fd4 647 */
mbed_official 0:51ac1d130fd4 648 err_t
mbed_official 0:51ac1d130fd4 649 tcp_connect(struct tcp_pcb *pcb, ip_addr_t *ipaddr, u16_t port,
mbed_official 0:51ac1d130fd4 650 tcp_connected_fn connected)
mbed_official 0:51ac1d130fd4 651 {
mbed_official 0:51ac1d130fd4 652 err_t ret;
mbed_official 0:51ac1d130fd4 653 u32_t iss;
mbed_official 0:51ac1d130fd4 654 u16_t old_local_port;
mbed_official 0:51ac1d130fd4 655
mbed_official 0:51ac1d130fd4 656 LWIP_ERROR("tcp_connect: can only connect from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
mbed_official 0:51ac1d130fd4 657
mbed_official 0:51ac1d130fd4 658 LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
mbed_official 0:51ac1d130fd4 659 if (ipaddr != NULL) {
mbed_official 0:51ac1d130fd4 660 pcb->remote_ip = *ipaddr;
mbed_official 0:51ac1d130fd4 661 } else {
mbed_official 0:51ac1d130fd4 662 return ERR_VAL;
mbed_official 0:51ac1d130fd4 663 }
mbed_official 0:51ac1d130fd4 664 pcb->remote_port = port;
mbed_official 0:51ac1d130fd4 665
mbed_official 0:51ac1d130fd4 666 /* check if we have a route to the remote host */
mbed_official 0:51ac1d130fd4 667 if (ip_addr_isany(&(pcb->local_ip))) {
mbed_official 0:51ac1d130fd4 668 /* no local IP address set, yet. */
mbed_official 0:51ac1d130fd4 669 struct netif *netif = ip_route(&(pcb->remote_ip));
mbed_official 0:51ac1d130fd4 670 if (netif == NULL) {
mbed_official 0:51ac1d130fd4 671 /* Don't even try to send a SYN packet if we have no route
mbed_official 0:51ac1d130fd4 672 since that will fail. */
mbed_official 0:51ac1d130fd4 673 return ERR_RTE;
mbed_official 0:51ac1d130fd4 674 }
mbed_official 0:51ac1d130fd4 675 /* Use the netif's IP address as local address. */
mbed_official 0:51ac1d130fd4 676 ip_addr_copy(pcb->local_ip, netif->ip_addr);
mbed_official 0:51ac1d130fd4 677 }
mbed_official 0:51ac1d130fd4 678
mbed_official 0:51ac1d130fd4 679 old_local_port = pcb->local_port;
mbed_official 0:51ac1d130fd4 680 if (pcb->local_port == 0) {
mbed_official 0:51ac1d130fd4 681 pcb->local_port = tcp_new_port();
mbed_official 0:51ac1d130fd4 682 }
mbed_official 0:51ac1d130fd4 683 #if SO_REUSE
mbed_official 0:51ac1d130fd4 684 if ((pcb->so_options & SOF_REUSEADDR) != 0) {
mbed_official 0:51ac1d130fd4 685 /* Since SOF_REUSEADDR allows reusing a local address, we have to make sure
mbed_official 0:51ac1d130fd4 686 now that the 5-tuple is unique. */
mbed_official 0:51ac1d130fd4 687 struct tcp_pcb *cpcb;
mbed_official 0:51ac1d130fd4 688 int i;
mbed_official 0:51ac1d130fd4 689 /* Don't check listen- and bound-PCBs, check active- and TIME-WAIT PCBs. */
mbed_official 0:51ac1d130fd4 690 for (i = 2; i < NUM_TCP_PCB_LISTS; i++) {
mbed_official 0:51ac1d130fd4 691 for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
mbed_official 0:51ac1d130fd4 692 if ((cpcb->local_port == pcb->local_port) &&
mbed_official 0:51ac1d130fd4 693 (cpcb->remote_port == port) &&
mbed_official 0:51ac1d130fd4 694 ip_addr_cmp(&cpcb->local_ip, &pcb->local_ip) &&
mbed_official 0:51ac1d130fd4 695 ip_addr_cmp(&cpcb->remote_ip, ipaddr)) {
mbed_official 0:51ac1d130fd4 696 /* linux returns EISCONN here, but ERR_USE should be OK for us */
mbed_official 0:51ac1d130fd4 697 return ERR_USE;
mbed_official 0:51ac1d130fd4 698 }
mbed_official 0:51ac1d130fd4 699 }
mbed_official 0:51ac1d130fd4 700 }
mbed_official 0:51ac1d130fd4 701 }
mbed_official 0:51ac1d130fd4 702 #endif /* SO_REUSE */
mbed_official 0:51ac1d130fd4 703 iss = tcp_next_iss();
mbed_official 0:51ac1d130fd4 704 pcb->rcv_nxt = 0;
mbed_official 0:51ac1d130fd4 705 pcb->snd_nxt = iss;
mbed_official 0:51ac1d130fd4 706 pcb->lastack = iss - 1;
mbed_official 0:51ac1d130fd4 707 pcb->snd_lbb = iss - 1;
mbed_official 0:51ac1d130fd4 708 pcb->rcv_wnd = TCP_WND;
mbed_official 0:51ac1d130fd4 709 pcb->rcv_ann_wnd = TCP_WND;
mbed_official 0:51ac1d130fd4 710 pcb->rcv_ann_right_edge = pcb->rcv_nxt;
mbed_official 0:51ac1d130fd4 711 pcb->snd_wnd = TCP_WND;
mbed_official 0:51ac1d130fd4 712 /* As initial send MSS, we use TCP_MSS but limit it to 536.
mbed_official 0:51ac1d130fd4 713 The send MSS is updated when an MSS option is received. */
mbed_official 0:51ac1d130fd4 714 pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
mbed_official 0:51ac1d130fd4 715 #if TCP_CALCULATE_EFF_SEND_MSS
mbed_official 0:51ac1d130fd4 716 pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr);
mbed_official 0:51ac1d130fd4 717 #endif /* TCP_CALCULATE_EFF_SEND_MSS */
mbed_official 0:51ac1d130fd4 718 pcb->cwnd = 1;
mbed_official 0:51ac1d130fd4 719 pcb->ssthresh = pcb->mss * 10;
mbed_official 0:51ac1d130fd4 720 #if LWIP_CALLBACK_API
mbed_official 0:51ac1d130fd4 721 pcb->connected = connected;
mbed_official 0:51ac1d130fd4 722 #else /* LWIP_CALLBACK_API */
mbed_official 0:51ac1d130fd4 723 LWIP_UNUSED_ARG(connected);
mbed_official 0:51ac1d130fd4 724 #endif /* LWIP_CALLBACK_API */
mbed_official 0:51ac1d130fd4 725
mbed_official 0:51ac1d130fd4 726 /* Send a SYN together with the MSS option. */
mbed_official 0:51ac1d130fd4 727 ret = tcp_enqueue_flags(pcb, TCP_SYN);
mbed_official 0:51ac1d130fd4 728 if (ret == ERR_OK) {
mbed_official 0:51ac1d130fd4 729 /* SYN segment was enqueued, changed the pcbs state now */
mbed_official 0:51ac1d130fd4 730 pcb->state = SYN_SENT;
mbed_official 0:51ac1d130fd4 731 if (old_local_port != 0) {
mbed_official 0:51ac1d130fd4 732 TCP_RMV(&tcp_bound_pcbs, pcb);
mbed_official 0:51ac1d130fd4 733 }
mbed_official 0:51ac1d130fd4 734 TCP_REG(&tcp_active_pcbs, pcb);
mbed_official 0:51ac1d130fd4 735 snmp_inc_tcpactiveopens();
mbed_official 0:51ac1d130fd4 736
mbed_official 0:51ac1d130fd4 737 tcp_output(pcb);
mbed_official 0:51ac1d130fd4 738 }
mbed_official 0:51ac1d130fd4 739 return ret;
mbed_official 0:51ac1d130fd4 740 }
mbed_official 0:51ac1d130fd4 741
mbed_official 0:51ac1d130fd4 742 /**
mbed_official 0:51ac1d130fd4 743 * Called every 500 ms and implements the retransmission timer and the timer that
mbed_official 0:51ac1d130fd4 744 * removes PCBs that have been in TIME-WAIT for enough time. It also increments
mbed_official 0:51ac1d130fd4 745 * various timers such as the inactivity timer in each PCB.
mbed_official 0:51ac1d130fd4 746 *
mbed_official 0:51ac1d130fd4 747 * Automatically called from tcp_tmr().
mbed_official 0:51ac1d130fd4 748 */
mbed_official 0:51ac1d130fd4 749 void
mbed_official 0:51ac1d130fd4 750 tcp_slowtmr(void)
mbed_official 0:51ac1d130fd4 751 {
mbed_official 0:51ac1d130fd4 752 struct tcp_pcb *pcb, *prev;
mbed_official 0:51ac1d130fd4 753 u16_t eff_wnd;
mbed_official 0:51ac1d130fd4 754 u8_t pcb_remove; /* flag if a PCB should be removed */
mbed_official 0:51ac1d130fd4 755 u8_t pcb_reset; /* flag if a RST should be sent when removing */
mbed_official 0:51ac1d130fd4 756 err_t err;
mbed_official 0:51ac1d130fd4 757
mbed_official 0:51ac1d130fd4 758 err = ERR_OK;
mbed_official 0:51ac1d130fd4 759
mbed_official 0:51ac1d130fd4 760 ++tcp_ticks;
mbed_official 0:51ac1d130fd4 761
mbed_official 0:51ac1d130fd4 762 /* Steps through all of the active PCBs. */
mbed_official 0:51ac1d130fd4 763 prev = NULL;
mbed_official 0:51ac1d130fd4 764 pcb = tcp_active_pcbs;
mbed_official 0:51ac1d130fd4 765 if (pcb == NULL) {
mbed_official 0:51ac1d130fd4 766 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
mbed_official 0:51ac1d130fd4 767 }
mbed_official 0:51ac1d130fd4 768 while (pcb != NULL) {
mbed_official 0:51ac1d130fd4 769 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
mbed_official 0:51ac1d130fd4 770 LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
mbed_official 0:51ac1d130fd4 771 LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
mbed_official 0:51ac1d130fd4 772 LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
mbed_official 0:51ac1d130fd4 773
mbed_official 0:51ac1d130fd4 774 pcb_remove = 0;
mbed_official 0:51ac1d130fd4 775 pcb_reset = 0;
mbed_official 0:51ac1d130fd4 776
mbed_official 0:51ac1d130fd4 777 if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
mbed_official 0:51ac1d130fd4 778 ++pcb_remove;
mbed_official 0:51ac1d130fd4 779 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
mbed_official 0:51ac1d130fd4 780 }
mbed_official 0:51ac1d130fd4 781 else if (pcb->nrtx == TCP_MAXRTX) {
mbed_official 0:51ac1d130fd4 782 ++pcb_remove;
mbed_official 0:51ac1d130fd4 783 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
mbed_official 0:51ac1d130fd4 784 } else {
mbed_official 0:51ac1d130fd4 785 if (pcb->persist_backoff > 0) {
mbed_official 0:51ac1d130fd4 786 /* If snd_wnd is zero, use persist timer to send 1 byte probes
mbed_official 0:51ac1d130fd4 787 * instead of using the standard retransmission mechanism. */
mbed_official 0:51ac1d130fd4 788 pcb->persist_cnt++;
mbed_official 0:51ac1d130fd4 789 if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) {
mbed_official 0:51ac1d130fd4 790 pcb->persist_cnt = 0;
mbed_official 0:51ac1d130fd4 791 if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
mbed_official 0:51ac1d130fd4 792 pcb->persist_backoff++;
mbed_official 0:51ac1d130fd4 793 }
mbed_official 0:51ac1d130fd4 794 tcp_zero_window_probe(pcb);
mbed_official 0:51ac1d130fd4 795 }
mbed_official 0:51ac1d130fd4 796 } else {
mbed_official 0:51ac1d130fd4 797 /* Increase the retransmission timer if it is running */
mbed_official 0:51ac1d130fd4 798 if(pcb->rtime >= 0)
mbed_official 0:51ac1d130fd4 799 ++pcb->rtime;
mbed_official 0:51ac1d130fd4 800
mbed_official 0:51ac1d130fd4 801 if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
mbed_official 0:51ac1d130fd4 802 /* Time for a retransmission. */
mbed_official 0:51ac1d130fd4 803 LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
mbed_official 0:51ac1d130fd4 804 " pcb->rto %"S16_F"\n",
mbed_official 0:51ac1d130fd4 805 pcb->rtime, pcb->rto));
mbed_official 0:51ac1d130fd4 806
mbed_official 0:51ac1d130fd4 807 /* Double retransmission time-out unless we are trying to
mbed_official 0:51ac1d130fd4 808 * connect to somebody (i.e., we are in SYN_SENT). */
mbed_official 0:51ac1d130fd4 809 if (pcb->state != SYN_SENT) {
mbed_official 0:51ac1d130fd4 810 pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
mbed_official 0:51ac1d130fd4 811 }
mbed_official 0:51ac1d130fd4 812
mbed_official 0:51ac1d130fd4 813 /* Reset the retransmission timer. */
mbed_official 0:51ac1d130fd4 814 pcb->rtime = 0;
mbed_official 0:51ac1d130fd4 815
mbed_official 0:51ac1d130fd4 816 /* Reduce congestion window and ssthresh. */
mbed_official 0:51ac1d130fd4 817 eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
mbed_official 0:51ac1d130fd4 818 pcb->ssthresh = eff_wnd >> 1;
mbed_official 0:51ac1d130fd4 819 if (pcb->ssthresh < (pcb->mss << 1)) {
mbed_official 0:51ac1d130fd4 820 pcb->ssthresh = (pcb->mss << 1);
mbed_official 0:51ac1d130fd4 821 }
mbed_official 0:51ac1d130fd4 822 pcb->cwnd = pcb->mss;
mbed_official 0:51ac1d130fd4 823 LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F
mbed_official 0:51ac1d130fd4 824 " ssthresh %"U16_F"\n",
mbed_official 0:51ac1d130fd4 825 pcb->cwnd, pcb->ssthresh));
mbed_official 0:51ac1d130fd4 826
mbed_official 0:51ac1d130fd4 827 /* The following needs to be called AFTER cwnd is set to one
mbed_official 0:51ac1d130fd4 828 mss - STJ */
mbed_official 0:51ac1d130fd4 829 tcp_rexmit_rto(pcb);
mbed_official 0:51ac1d130fd4 830 }
mbed_official 0:51ac1d130fd4 831 }
mbed_official 0:51ac1d130fd4 832 }
mbed_official 0:51ac1d130fd4 833 /* Check if this PCB has stayed too long in FIN-WAIT-2 */
mbed_official 0:51ac1d130fd4 834 if (pcb->state == FIN_WAIT_2) {
mbed_official 0:51ac1d130fd4 835 if ((u32_t)(tcp_ticks - pcb->tmr) >
mbed_official 0:51ac1d130fd4 836 TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
mbed_official 0:51ac1d130fd4 837 ++pcb_remove;
mbed_official 0:51ac1d130fd4 838 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
mbed_official 0:51ac1d130fd4 839 }
mbed_official 0:51ac1d130fd4 840 }
mbed_official 0:51ac1d130fd4 841
mbed_official 0:51ac1d130fd4 842 /* Check if KEEPALIVE should be sent */
mbed_official 0:51ac1d130fd4 843 if((pcb->so_options & SOF_KEEPALIVE) &&
mbed_official 0:51ac1d130fd4 844 ((pcb->state == ESTABLISHED) ||
mbed_official 0:51ac1d130fd4 845 (pcb->state == CLOSE_WAIT))) {
mbed_official 0:51ac1d130fd4 846 #if LWIP_TCP_KEEPALIVE
mbed_official 0:51ac1d130fd4 847 if((u32_t)(tcp_ticks - pcb->tmr) >
mbed_official 0:51ac1d130fd4 848 (pcb->keep_idle + (pcb->keep_cnt*pcb->keep_intvl))
mbed_official 0:51ac1d130fd4 849 / TCP_SLOW_INTERVAL)
mbed_official 0:51ac1d130fd4 850 #else
mbed_official 0:51ac1d130fd4 851 if((u32_t)(tcp_ticks - pcb->tmr) >
mbed_official 0:51ac1d130fd4 852 (pcb->keep_idle + TCP_MAXIDLE) / TCP_SLOW_INTERVAL)
mbed_official 0:51ac1d130fd4 853 #endif /* LWIP_TCP_KEEPALIVE */
mbed_official 0:51ac1d130fd4 854 {
mbed_official 0:51ac1d130fd4 855 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n",
mbed_official 0:51ac1d130fd4 856 ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
mbed_official 0:51ac1d130fd4 857 ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
mbed_official 0:51ac1d130fd4 858
mbed_official 0:51ac1d130fd4 859 ++pcb_remove;
mbed_official 0:51ac1d130fd4 860 ++pcb_reset;
mbed_official 0:51ac1d130fd4 861 }
mbed_official 0:51ac1d130fd4 862 #if LWIP_TCP_KEEPALIVE
mbed_official 0:51ac1d130fd4 863 else if((u32_t)(tcp_ticks - pcb->tmr) >
mbed_official 0:51ac1d130fd4 864 (pcb->keep_idle + pcb->keep_cnt_sent * pcb->keep_intvl)
mbed_official 0:51ac1d130fd4 865 / TCP_SLOW_INTERVAL)
mbed_official 0:51ac1d130fd4 866 #else
mbed_official 0:51ac1d130fd4 867 else if((u32_t)(tcp_ticks - pcb->tmr) >
mbed_official 0:51ac1d130fd4 868 (pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEPINTVL_DEFAULT)
mbed_official 0:51ac1d130fd4 869 / TCP_SLOW_INTERVAL)
mbed_official 0:51ac1d130fd4 870 #endif /* LWIP_TCP_KEEPALIVE */
mbed_official 0:51ac1d130fd4 871 {
mbed_official 0:51ac1d130fd4 872 tcp_keepalive(pcb);
mbed_official 0:51ac1d130fd4 873 pcb->keep_cnt_sent++;
mbed_official 0:51ac1d130fd4 874 }
mbed_official 0:51ac1d130fd4 875 }
mbed_official 0:51ac1d130fd4 876
mbed_official 0:51ac1d130fd4 877 /* If this PCB has queued out of sequence data, but has been
mbed_official 0:51ac1d130fd4 878 inactive for too long, will drop the data (it will eventually
mbed_official 0:51ac1d130fd4 879 be retransmitted). */
mbed_official 0:51ac1d130fd4 880 #if TCP_QUEUE_OOSEQ
mbed_official 0:51ac1d130fd4 881 if (pcb->ooseq != NULL &&
mbed_official 0:51ac1d130fd4 882 (u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) {
mbed_official 0:51ac1d130fd4 883 tcp_segs_free(pcb->ooseq);
mbed_official 0:51ac1d130fd4 884 pcb->ooseq = NULL;
mbed_official 0:51ac1d130fd4 885 LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
mbed_official 0:51ac1d130fd4 886 }
mbed_official 0:51ac1d130fd4 887 #endif /* TCP_QUEUE_OOSEQ */
mbed_official 0:51ac1d130fd4 888
mbed_official 0:51ac1d130fd4 889 /* Check if this PCB has stayed too long in SYN-RCVD */
mbed_official 0:51ac1d130fd4 890 if (pcb->state == SYN_RCVD) {
mbed_official 0:51ac1d130fd4 891 if ((u32_t)(tcp_ticks - pcb->tmr) >
mbed_official 0:51ac1d130fd4 892 TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
mbed_official 0:51ac1d130fd4 893 ++pcb_remove;
mbed_official 0:51ac1d130fd4 894 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
mbed_official 0:51ac1d130fd4 895 }
mbed_official 0:51ac1d130fd4 896 }
mbed_official 0:51ac1d130fd4 897
mbed_official 0:51ac1d130fd4 898 /* Check if this PCB has stayed too long in LAST-ACK */
mbed_official 0:51ac1d130fd4 899 if (pcb->state == LAST_ACK) {
mbed_official 0:51ac1d130fd4 900 if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
mbed_official 0:51ac1d130fd4 901 ++pcb_remove;
mbed_official 0:51ac1d130fd4 902 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
mbed_official 0:51ac1d130fd4 903 }
mbed_official 0:51ac1d130fd4 904 }
mbed_official 0:51ac1d130fd4 905
mbed_official 0:51ac1d130fd4 906 /* If the PCB should be removed, do it. */
mbed_official 0:51ac1d130fd4 907 if (pcb_remove) {
mbed_official 0:51ac1d130fd4 908 struct tcp_pcb *pcb2;
mbed_official 0:51ac1d130fd4 909 tcp_pcb_purge(pcb);
mbed_official 0:51ac1d130fd4 910 /* Remove PCB from tcp_active_pcbs list. */
mbed_official 0:51ac1d130fd4 911 if (prev != NULL) {
mbed_official 0:51ac1d130fd4 912 LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
mbed_official 0:51ac1d130fd4 913 prev->next = pcb->next;
mbed_official 0:51ac1d130fd4 914 } else {
mbed_official 0:51ac1d130fd4 915 /* This PCB was the first. */
mbed_official 0:51ac1d130fd4 916 LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
mbed_official 0:51ac1d130fd4 917 tcp_active_pcbs = pcb->next;
mbed_official 0:51ac1d130fd4 918 }
mbed_official 0:51ac1d130fd4 919
mbed_official 0:51ac1d130fd4 920 TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_ABRT);
mbed_official 0:51ac1d130fd4 921 if (pcb_reset) {
mbed_official 0:51ac1d130fd4 922 tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
mbed_official 0:51ac1d130fd4 923 pcb->local_port, pcb->remote_port);
mbed_official 0:51ac1d130fd4 924 }
mbed_official 0:51ac1d130fd4 925
mbed_official 0:51ac1d130fd4 926 pcb2 = pcb;
mbed_official 0:51ac1d130fd4 927 pcb = pcb->next;
mbed_official 0:51ac1d130fd4 928 memp_free(MEMP_TCP_PCB, pcb2);
mbed_official 0:51ac1d130fd4 929 } else {
mbed_official 0:51ac1d130fd4 930 /* get the 'next' element now and work with 'prev' below (in case of abort) */
mbed_official 0:51ac1d130fd4 931 prev = pcb;
mbed_official 0:51ac1d130fd4 932 pcb = pcb->next;
mbed_official 0:51ac1d130fd4 933
mbed_official 0:51ac1d130fd4 934 /* We check if we should poll the connection. */
mbed_official 0:51ac1d130fd4 935 ++prev->polltmr;
mbed_official 0:51ac1d130fd4 936 if (prev->polltmr >= prev->pollinterval) {
mbed_official 0:51ac1d130fd4 937 prev->polltmr = 0;
mbed_official 0:51ac1d130fd4 938 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
mbed_official 0:51ac1d130fd4 939 TCP_EVENT_POLL(prev, err);
mbed_official 0:51ac1d130fd4 940 /* if err == ERR_ABRT, 'prev' is already deallocated */
mbed_official 0:51ac1d130fd4 941 if (err == ERR_OK) {
mbed_official 0:51ac1d130fd4 942 tcp_output(prev);
mbed_official 0:51ac1d130fd4 943 }
mbed_official 0:51ac1d130fd4 944 }
mbed_official 0:51ac1d130fd4 945 }
mbed_official 0:51ac1d130fd4 946 }
mbed_official 0:51ac1d130fd4 947
mbed_official 0:51ac1d130fd4 948
mbed_official 0:51ac1d130fd4 949 /* Steps through all of the TIME-WAIT PCBs. */
mbed_official 0:51ac1d130fd4 950 prev = NULL;
mbed_official 0:51ac1d130fd4 951 pcb = tcp_tw_pcbs;
mbed_official 0:51ac1d130fd4 952 while (pcb != NULL) {
mbed_official 0:51ac1d130fd4 953 LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
mbed_official 0:51ac1d130fd4 954 pcb_remove = 0;
mbed_official 0:51ac1d130fd4 955
mbed_official 0:51ac1d130fd4 956 /* Check if this PCB has stayed long enough in TIME-WAIT */
mbed_official 0:51ac1d130fd4 957 if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
mbed_official 0:51ac1d130fd4 958 ++pcb_remove;
mbed_official 0:51ac1d130fd4 959 }
mbed_official 0:51ac1d130fd4 960
mbed_official 0:51ac1d130fd4 961
mbed_official 0:51ac1d130fd4 962
mbed_official 0:51ac1d130fd4 963 /* If the PCB should be removed, do it. */
mbed_official 0:51ac1d130fd4 964 if (pcb_remove) {
mbed_official 0:51ac1d130fd4 965 struct tcp_pcb *pcb2;
mbed_official 0:51ac1d130fd4 966 tcp_pcb_purge(pcb);
mbed_official 0:51ac1d130fd4 967 /* Remove PCB from tcp_tw_pcbs list. */
mbed_official 0:51ac1d130fd4 968 if (prev != NULL) {
mbed_official 0:51ac1d130fd4 969 LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
mbed_official 0:51ac1d130fd4 970 prev->next = pcb->next;
mbed_official 0:51ac1d130fd4 971 } else {
mbed_official 0:51ac1d130fd4 972 /* This PCB was the first. */
mbed_official 0:51ac1d130fd4 973 LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
mbed_official 0:51ac1d130fd4 974 tcp_tw_pcbs = pcb->next;
mbed_official 0:51ac1d130fd4 975 }
mbed_official 0:51ac1d130fd4 976 pcb2 = pcb;
mbed_official 0:51ac1d130fd4 977 pcb = pcb->next;
mbed_official 0:51ac1d130fd4 978 memp_free(MEMP_TCP_PCB, pcb2);
mbed_official 0:51ac1d130fd4 979 } else {
mbed_official 0:51ac1d130fd4 980 prev = pcb;
mbed_official 0:51ac1d130fd4 981 pcb = pcb->next;
mbed_official 0:51ac1d130fd4 982 }
mbed_official 0:51ac1d130fd4 983 }
mbed_official 0:51ac1d130fd4 984 }
mbed_official 0:51ac1d130fd4 985
mbed_official 0:51ac1d130fd4 986 /**
mbed_official 0:51ac1d130fd4 987 * Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
mbed_official 0:51ac1d130fd4 988 * "refused" by upper layer (application) and sends delayed ACKs.
mbed_official 0:51ac1d130fd4 989 *
mbed_official 0:51ac1d130fd4 990 * Automatically called from tcp_tmr().
mbed_official 0:51ac1d130fd4 991 */
mbed_official 0:51ac1d130fd4 992 void
mbed_official 0:51ac1d130fd4 993 tcp_fasttmr(void)
mbed_official 0:51ac1d130fd4 994 {
mbed_official 0:51ac1d130fd4 995 struct tcp_pcb *pcb = tcp_active_pcbs;
mbed_official 0:51ac1d130fd4 996
mbed_official 0:51ac1d130fd4 997 while(pcb != NULL) {
mbed_official 0:51ac1d130fd4 998 struct tcp_pcb *next = pcb->next;
mbed_official 0:51ac1d130fd4 999 /* If there is data which was previously "refused" by upper layer */
mbed_official 0:51ac1d130fd4 1000 if (pcb->refused_data != NULL) {
mbed_official 0:51ac1d130fd4 1001 /* Notify again application with data previously received. */
mbed_official 0:51ac1d130fd4 1002 err_t err;
mbed_official 0:51ac1d130fd4 1003 LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_fasttmr: notify kept packet\n"));
mbed_official 0:51ac1d130fd4 1004 TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
mbed_official 0:51ac1d130fd4 1005 if (err == ERR_OK) {
mbed_official 0:51ac1d130fd4 1006 pcb->refused_data = NULL;
mbed_official 0:51ac1d130fd4 1007 } else if (err == ERR_ABRT) {
mbed_official 0:51ac1d130fd4 1008 /* if err == ERR_ABRT, 'pcb' is already deallocated */
mbed_official 0:51ac1d130fd4 1009 pcb = NULL;
mbed_official 0:51ac1d130fd4 1010 }
mbed_official 0:51ac1d130fd4 1011 }
mbed_official 0:51ac1d130fd4 1012
mbed_official 0:51ac1d130fd4 1013 /* send delayed ACKs */
mbed_official 0:51ac1d130fd4 1014 if (pcb && (pcb->flags & TF_ACK_DELAY)) {
mbed_official 0:51ac1d130fd4 1015 LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
mbed_official 0:51ac1d130fd4 1016 tcp_ack_now(pcb);
mbed_official 0:51ac1d130fd4 1017 tcp_output(pcb);
mbed_official 0:51ac1d130fd4 1018 pcb->flags &= ~(TF_ACK_DELAY | TF_ACK_NOW);
mbed_official 0:51ac1d130fd4 1019 }
mbed_official 0:51ac1d130fd4 1020
mbed_official 0:51ac1d130fd4 1021 pcb = next;
mbed_official 0:51ac1d130fd4 1022 }
mbed_official 0:51ac1d130fd4 1023 }
mbed_official 0:51ac1d130fd4 1024
mbed_official 0:51ac1d130fd4 1025 /**
mbed_official 0:51ac1d130fd4 1026 * Deallocates a list of TCP segments (tcp_seg structures).
mbed_official 0:51ac1d130fd4 1027 *
mbed_official 0:51ac1d130fd4 1028 * @param seg tcp_seg list of TCP segments to free
mbed_official 0:51ac1d130fd4 1029 */
mbed_official 0:51ac1d130fd4 1030 void
mbed_official 0:51ac1d130fd4 1031 tcp_segs_free(struct tcp_seg *seg)
mbed_official 0:51ac1d130fd4 1032 {
mbed_official 0:51ac1d130fd4 1033 while (seg != NULL) {
mbed_official 0:51ac1d130fd4 1034 struct tcp_seg *next = seg->next;
mbed_official 0:51ac1d130fd4 1035 tcp_seg_free(seg);
mbed_official 0:51ac1d130fd4 1036 seg = next;
mbed_official 0:51ac1d130fd4 1037 }
mbed_official 0:51ac1d130fd4 1038 }
mbed_official 0:51ac1d130fd4 1039
mbed_official 0:51ac1d130fd4 1040 /**
mbed_official 0:51ac1d130fd4 1041 * Frees a TCP segment (tcp_seg structure).
mbed_official 0:51ac1d130fd4 1042 *
mbed_official 0:51ac1d130fd4 1043 * @param seg single tcp_seg to free
mbed_official 0:51ac1d130fd4 1044 */
mbed_official 0:51ac1d130fd4 1045 void
mbed_official 0:51ac1d130fd4 1046 tcp_seg_free(struct tcp_seg *seg)
mbed_official 0:51ac1d130fd4 1047 {
mbed_official 0:51ac1d130fd4 1048 if (seg != NULL) {
mbed_official 0:51ac1d130fd4 1049 if (seg->p != NULL) {
mbed_official 0:51ac1d130fd4 1050 pbuf_free(seg->p);
mbed_official 0:51ac1d130fd4 1051 #if TCP_DEBUG
mbed_official 0:51ac1d130fd4 1052 seg->p = NULL;
mbed_official 0:51ac1d130fd4 1053 #endif /* TCP_DEBUG */
mbed_official 0:51ac1d130fd4 1054 }
mbed_official 0:51ac1d130fd4 1055 memp_free(MEMP_TCP_SEG, seg);
mbed_official 0:51ac1d130fd4 1056 }
mbed_official 0:51ac1d130fd4 1057 }
mbed_official 0:51ac1d130fd4 1058
mbed_official 0:51ac1d130fd4 1059 /**
mbed_official 0:51ac1d130fd4 1060 * Sets the priority of a connection.
mbed_official 0:51ac1d130fd4 1061 *
mbed_official 0:51ac1d130fd4 1062 * @param pcb the tcp_pcb to manipulate
mbed_official 0:51ac1d130fd4 1063 * @param prio new priority
mbed_official 0:51ac1d130fd4 1064 */
mbed_official 0:51ac1d130fd4 1065 void
mbed_official 0:51ac1d130fd4 1066 tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
mbed_official 0:51ac1d130fd4 1067 {
mbed_official 0:51ac1d130fd4 1068 pcb->prio = prio;
mbed_official 0:51ac1d130fd4 1069 }
mbed_official 0:51ac1d130fd4 1070
mbed_official 0:51ac1d130fd4 1071 #if TCP_QUEUE_OOSEQ
mbed_official 0:51ac1d130fd4 1072 /**
mbed_official 0:51ac1d130fd4 1073 * Returns a copy of the given TCP segment.
mbed_official 0:51ac1d130fd4 1074 * The pbuf and data are not copied, only the pointers
mbed_official 0:51ac1d130fd4 1075 *
mbed_official 0:51ac1d130fd4 1076 * @param seg the old tcp_seg
mbed_official 0:51ac1d130fd4 1077 * @return a copy of seg
mbed_official 0:51ac1d130fd4 1078 */
mbed_official 0:51ac1d130fd4 1079 struct tcp_seg *
mbed_official 0:51ac1d130fd4 1080 tcp_seg_copy(struct tcp_seg *seg)
mbed_official 0:51ac1d130fd4 1081 {
mbed_official 0:51ac1d130fd4 1082 struct tcp_seg *cseg;
mbed_official 0:51ac1d130fd4 1083
mbed_official 0:51ac1d130fd4 1084 cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG);
mbed_official 0:51ac1d130fd4 1085 if (cseg == NULL) {
mbed_official 0:51ac1d130fd4 1086 return NULL;
mbed_official 0:51ac1d130fd4 1087 }
mbed_official 0:51ac1d130fd4 1088 SMEMCPY((u8_t *)cseg, (const u8_t *)seg, sizeof(struct tcp_seg));
mbed_official 0:51ac1d130fd4 1089 pbuf_ref(cseg->p);
mbed_official 0:51ac1d130fd4 1090 return cseg;
mbed_official 0:51ac1d130fd4 1091 }
mbed_official 0:51ac1d130fd4 1092 #endif /* TCP_QUEUE_OOSEQ */
mbed_official 0:51ac1d130fd4 1093
mbed_official 0:51ac1d130fd4 1094 #if LWIP_CALLBACK_API
mbed_official 0:51ac1d130fd4 1095 /**
mbed_official 0:51ac1d130fd4 1096 * Default receive callback that is called if the user didn't register
mbed_official 0:51ac1d130fd4 1097 * a recv callback for the pcb.
mbed_official 0:51ac1d130fd4 1098 */
mbed_official 0:51ac1d130fd4 1099 err_t
mbed_official 0:51ac1d130fd4 1100 tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
mbed_official 0:51ac1d130fd4 1101 {
mbed_official 0:51ac1d130fd4 1102 LWIP_UNUSED_ARG(arg);
mbed_official 0:51ac1d130fd4 1103 if (p != NULL) {
mbed_official 0:51ac1d130fd4 1104 tcp_recved(pcb, p->tot_len);
mbed_official 0:51ac1d130fd4 1105 pbuf_free(p);
mbed_official 0:51ac1d130fd4 1106 } else if (err == ERR_OK) {
mbed_official 0:51ac1d130fd4 1107 return tcp_close(pcb);
mbed_official 0:51ac1d130fd4 1108 }
mbed_official 0:51ac1d130fd4 1109 return ERR_OK;
mbed_official 0:51ac1d130fd4 1110 }
mbed_official 0:51ac1d130fd4 1111 #endif /* LWIP_CALLBACK_API */
mbed_official 0:51ac1d130fd4 1112
mbed_official 0:51ac1d130fd4 1113 /**
mbed_official 0:51ac1d130fd4 1114 * Kills the oldest active connection that has lower priority than prio.
mbed_official 0:51ac1d130fd4 1115 *
mbed_official 0:51ac1d130fd4 1116 * @param prio minimum priority
mbed_official 0:51ac1d130fd4 1117 */
mbed_official 0:51ac1d130fd4 1118 static void
mbed_official 0:51ac1d130fd4 1119 tcp_kill_prio(u8_t prio)
mbed_official 0:51ac1d130fd4 1120 {
mbed_official 0:51ac1d130fd4 1121 struct tcp_pcb *pcb, *inactive;
mbed_official 0:51ac1d130fd4 1122 u32_t inactivity;
mbed_official 0:51ac1d130fd4 1123 u8_t mprio;
mbed_official 0:51ac1d130fd4 1124
mbed_official 0:51ac1d130fd4 1125
mbed_official 0:51ac1d130fd4 1126 mprio = TCP_PRIO_MAX;
mbed_official 0:51ac1d130fd4 1127
mbed_official 0:51ac1d130fd4 1128 /* We kill the oldest active connection that has lower priority than prio. */
mbed_official 0:51ac1d130fd4 1129 inactivity = 0;
mbed_official 0:51ac1d130fd4 1130 inactive = NULL;
mbed_official 0:51ac1d130fd4 1131 for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
mbed_official 0:51ac1d130fd4 1132 if (pcb->prio <= prio &&
mbed_official 0:51ac1d130fd4 1133 pcb->prio <= mprio &&
mbed_official 0:51ac1d130fd4 1134 (u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
mbed_official 0:51ac1d130fd4 1135 inactivity = tcp_ticks - pcb->tmr;
mbed_official 0:51ac1d130fd4 1136 inactive = pcb;
mbed_official 0:51ac1d130fd4 1137 mprio = pcb->prio;
mbed_official 0:51ac1d130fd4 1138 }
mbed_official 0:51ac1d130fd4 1139 }
mbed_official 0:51ac1d130fd4 1140 if (inactive != NULL) {
mbed_official 0:51ac1d130fd4 1141 LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n",
mbed_official 0:51ac1d130fd4 1142 (void *)inactive, inactivity));
mbed_official 0:51ac1d130fd4 1143 tcp_abort(inactive);
mbed_official 0:51ac1d130fd4 1144 }
mbed_official 0:51ac1d130fd4 1145 }
mbed_official 0:51ac1d130fd4 1146
mbed_official 0:51ac1d130fd4 1147 /**
mbed_official 0:51ac1d130fd4 1148 * Kills the oldest connection that is in TIME_WAIT state.
mbed_official 0:51ac1d130fd4 1149 * Called from tcp_alloc() if no more connections are available.
mbed_official 0:51ac1d130fd4 1150 */
mbed_official 0:51ac1d130fd4 1151 static void
mbed_official 0:51ac1d130fd4 1152 tcp_kill_timewait(void)
mbed_official 0:51ac1d130fd4 1153 {
mbed_official 0:51ac1d130fd4 1154 struct tcp_pcb *pcb, *inactive;
mbed_official 0:51ac1d130fd4 1155 u32_t inactivity;
mbed_official 0:51ac1d130fd4 1156
mbed_official 0:51ac1d130fd4 1157 inactivity = 0;
mbed_official 0:51ac1d130fd4 1158 inactive = NULL;
mbed_official 0:51ac1d130fd4 1159 /* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
mbed_official 0:51ac1d130fd4 1160 for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
mbed_official 0:51ac1d130fd4 1161 if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
mbed_official 0:51ac1d130fd4 1162 inactivity = tcp_ticks - pcb->tmr;
mbed_official 0:51ac1d130fd4 1163 inactive = pcb;
mbed_official 0:51ac1d130fd4 1164 }
mbed_official 0:51ac1d130fd4 1165 }
mbed_official 0:51ac1d130fd4 1166 if (inactive != NULL) {
mbed_official 0:51ac1d130fd4 1167 LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n",
mbed_official 0:51ac1d130fd4 1168 (void *)inactive, inactivity));
mbed_official 0:51ac1d130fd4 1169 tcp_abort(inactive);
mbed_official 0:51ac1d130fd4 1170 }
mbed_official 0:51ac1d130fd4 1171 }
mbed_official 0:51ac1d130fd4 1172
mbed_official 0:51ac1d130fd4 1173 /**
mbed_official 0:51ac1d130fd4 1174 * Allocate a new tcp_pcb structure.
mbed_official 0:51ac1d130fd4 1175 *
mbed_official 0:51ac1d130fd4 1176 * @param prio priority for the new pcb
mbed_official 0:51ac1d130fd4 1177 * @return a new tcp_pcb that initially is in state CLOSED
mbed_official 0:51ac1d130fd4 1178 */
mbed_official 0:51ac1d130fd4 1179 struct tcp_pcb *
mbed_official 0:51ac1d130fd4 1180 tcp_alloc(u8_t prio)
mbed_official 0:51ac1d130fd4 1181 {
mbed_official 0:51ac1d130fd4 1182 struct tcp_pcb *pcb;
mbed_official 0:51ac1d130fd4 1183 u32_t iss;
mbed_official 0:51ac1d130fd4 1184
mbed_official 0:51ac1d130fd4 1185 pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
mbed_official 0:51ac1d130fd4 1186 if (pcb == NULL) {
mbed_official 0:51ac1d130fd4 1187 /* Try killing oldest connection in TIME-WAIT. */
mbed_official 0:51ac1d130fd4 1188 LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
mbed_official 0:51ac1d130fd4 1189 tcp_kill_timewait();
mbed_official 0:51ac1d130fd4 1190 /* Try to allocate a tcp_pcb again. */
mbed_official 0:51ac1d130fd4 1191 pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
mbed_official 0:51ac1d130fd4 1192 if (pcb == NULL) {
mbed_official 0:51ac1d130fd4 1193 /* Try killing active connections with lower priority than the new one. */
mbed_official 0:51ac1d130fd4 1194 LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing connection with prio lower than %d\n", prio));
mbed_official 0:51ac1d130fd4 1195 tcp_kill_prio(prio);
mbed_official 0:51ac1d130fd4 1196 /* Try to allocate a tcp_pcb again. */
mbed_official 0:51ac1d130fd4 1197 pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
mbed_official 0:51ac1d130fd4 1198 if (pcb != NULL) {
mbed_official 0:51ac1d130fd4 1199 /* adjust err stats: memp_malloc failed twice before */
mbed_official 0:51ac1d130fd4 1200 MEMP_STATS_DEC(err, MEMP_TCP_PCB);
mbed_official 0:51ac1d130fd4 1201 }
mbed_official 0:51ac1d130fd4 1202 }
mbed_official 0:51ac1d130fd4 1203 if (pcb != NULL) {
mbed_official 0:51ac1d130fd4 1204 /* adjust err stats: timewait PCB was freed above */
mbed_official 0:51ac1d130fd4 1205 MEMP_STATS_DEC(err, MEMP_TCP_PCB);
mbed_official 0:51ac1d130fd4 1206 }
mbed_official 0:51ac1d130fd4 1207 }
mbed_official 0:51ac1d130fd4 1208 if (pcb != NULL) {
mbed_official 0:51ac1d130fd4 1209 memset(pcb, 0, sizeof(struct tcp_pcb));
mbed_official 0:51ac1d130fd4 1210 pcb->prio = prio;
mbed_official 0:51ac1d130fd4 1211 pcb->snd_buf = TCP_SND_BUF;
mbed_official 0:51ac1d130fd4 1212 pcb->snd_queuelen = 0;
mbed_official 0:51ac1d130fd4 1213 pcb->rcv_wnd = TCP_WND;
mbed_official 0:51ac1d130fd4 1214 pcb->rcv_ann_wnd = TCP_WND;
mbed_official 0:51ac1d130fd4 1215 pcb->tos = 0;
mbed_official 0:51ac1d130fd4 1216 pcb->ttl = TCP_TTL;
mbed_official 0:51ac1d130fd4 1217 /* As initial send MSS, we use TCP_MSS but limit it to 536.
mbed_official 0:51ac1d130fd4 1218 The send MSS is updated when an MSS option is received. */
mbed_official 0:51ac1d130fd4 1219 pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
mbed_official 0:51ac1d130fd4 1220 pcb->rto = 3000 / TCP_SLOW_INTERVAL;
mbed_official 0:51ac1d130fd4 1221 pcb->sa = 0;
mbed_official 0:51ac1d130fd4 1222 pcb->sv = 3000 / TCP_SLOW_INTERVAL;
mbed_official 0:51ac1d130fd4 1223 pcb->rtime = -1;
mbed_official 0:51ac1d130fd4 1224 pcb->cwnd = 1;
mbed_official 0:51ac1d130fd4 1225 iss = tcp_next_iss();
mbed_official 0:51ac1d130fd4 1226 pcb->snd_wl2 = iss;
mbed_official 0:51ac1d130fd4 1227 pcb->snd_nxt = iss;
mbed_official 0:51ac1d130fd4 1228 pcb->lastack = iss;
mbed_official 0:51ac1d130fd4 1229 pcb->snd_lbb = iss;
mbed_official 0:51ac1d130fd4 1230 pcb->tmr = tcp_ticks;
mbed_official 0:51ac1d130fd4 1231
mbed_official 0:51ac1d130fd4 1232 pcb->polltmr = 0;
mbed_official 0:51ac1d130fd4 1233
mbed_official 0:51ac1d130fd4 1234 #if LWIP_CALLBACK_API
mbed_official 0:51ac1d130fd4 1235 pcb->recv = tcp_recv_null;
mbed_official 0:51ac1d130fd4 1236 #endif /* LWIP_CALLBACK_API */
mbed_official 0:51ac1d130fd4 1237
mbed_official 0:51ac1d130fd4 1238 /* Init KEEPALIVE timer */
mbed_official 0:51ac1d130fd4 1239 pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
mbed_official 0:51ac1d130fd4 1240
mbed_official 0:51ac1d130fd4 1241 #if LWIP_TCP_KEEPALIVE
mbed_official 0:51ac1d130fd4 1242 pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
mbed_official 0:51ac1d130fd4 1243 pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
mbed_official 0:51ac1d130fd4 1244 #endif /* LWIP_TCP_KEEPALIVE */
mbed_official 0:51ac1d130fd4 1245
mbed_official 0:51ac1d130fd4 1246 pcb->keep_cnt_sent = 0;
mbed_official 0:51ac1d130fd4 1247 }
mbed_official 0:51ac1d130fd4 1248 return pcb;
mbed_official 0:51ac1d130fd4 1249 }
mbed_official 0:51ac1d130fd4 1250
mbed_official 0:51ac1d130fd4 1251 /**
mbed_official 0:51ac1d130fd4 1252 * Creates a new TCP protocol control block but doesn't place it on
mbed_official 0:51ac1d130fd4 1253 * any of the TCP PCB lists.
mbed_official 0:51ac1d130fd4 1254 * The pcb is not put on any list until binding using tcp_bind().
mbed_official 0:51ac1d130fd4 1255 *
mbed_official 0:51ac1d130fd4 1256 * @internal: Maybe there should be a idle TCP PCB list where these
mbed_official 0:51ac1d130fd4 1257 * PCBs are put on. Port reservation using tcp_bind() is implemented but
mbed_official 0:51ac1d130fd4 1258 * allocated pcbs that are not bound can't be killed automatically if wanting
mbed_official 0:51ac1d130fd4 1259 * to allocate a pcb with higher prio (@see tcp_kill_prio())
mbed_official 0:51ac1d130fd4 1260 *
mbed_official 0:51ac1d130fd4 1261 * @return a new tcp_pcb that initially is in state CLOSED
mbed_official 0:51ac1d130fd4 1262 */
mbed_official 0:51ac1d130fd4 1263 struct tcp_pcb *
mbed_official 0:51ac1d130fd4 1264 tcp_new(void)
mbed_official 0:51ac1d130fd4 1265 {
mbed_official 0:51ac1d130fd4 1266 return tcp_alloc(TCP_PRIO_NORMAL);
mbed_official 0:51ac1d130fd4 1267 }
mbed_official 0:51ac1d130fd4 1268
mbed_official 0:51ac1d130fd4 1269 /**
mbed_official 0:51ac1d130fd4 1270 * Used to specify the argument that should be passed callback
mbed_official 0:51ac1d130fd4 1271 * functions.
mbed_official 0:51ac1d130fd4 1272 *
mbed_official 0:51ac1d130fd4 1273 * @param pcb tcp_pcb to set the callback argument
mbed_official 0:51ac1d130fd4 1274 * @param arg void pointer argument to pass to callback functions
mbed_official 0:51ac1d130fd4 1275 */
mbed_official 0:51ac1d130fd4 1276 void
mbed_official 0:51ac1d130fd4 1277 tcp_arg(struct tcp_pcb *pcb, void *arg)
mbed_official 0:51ac1d130fd4 1278 {
mbed_official 0:51ac1d130fd4 1279 pcb->callback_arg = arg;
mbed_official 0:51ac1d130fd4 1280 }
mbed_official 0:51ac1d130fd4 1281 #if LWIP_CALLBACK_API
mbed_official 0:51ac1d130fd4 1282
mbed_official 0:51ac1d130fd4 1283 /**
mbed_official 0:51ac1d130fd4 1284 * Used to specify the function that should be called when a TCP
mbed_official 0:51ac1d130fd4 1285 * connection receives data.
mbed_official 0:51ac1d130fd4 1286 *
mbed_official 0:51ac1d130fd4 1287 * @param pcb tcp_pcb to set the recv callback
mbed_official 0:51ac1d130fd4 1288 * @param recv callback function to call for this pcb when data is received
mbed_official 0:51ac1d130fd4 1289 */
mbed_official 0:51ac1d130fd4 1290 void
mbed_official 0:51ac1d130fd4 1291 tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
mbed_official 0:51ac1d130fd4 1292 {
mbed_official 0:51ac1d130fd4 1293 pcb->recv = recv;
mbed_official 0:51ac1d130fd4 1294 }
mbed_official 0:51ac1d130fd4 1295
mbed_official 0:51ac1d130fd4 1296 /**
mbed_official 0:51ac1d130fd4 1297 * Used to specify the function that should be called when TCP data
mbed_official 0:51ac1d130fd4 1298 * has been successfully delivered to the remote host.
mbed_official 0:51ac1d130fd4 1299 *
mbed_official 0:51ac1d130fd4 1300 * @param pcb tcp_pcb to set the sent callback
mbed_official 0:51ac1d130fd4 1301 * @param sent callback function to call for this pcb when data is successfully sent
mbed_official 0:51ac1d130fd4 1302 */
mbed_official 0:51ac1d130fd4 1303 void
mbed_official 0:51ac1d130fd4 1304 tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
mbed_official 0:51ac1d130fd4 1305 {
mbed_official 0:51ac1d130fd4 1306 pcb->sent = sent;
mbed_official 0:51ac1d130fd4 1307 }
mbed_official 0:51ac1d130fd4 1308
mbed_official 0:51ac1d130fd4 1309 /**
mbed_official 0:51ac1d130fd4 1310 * Used to specify the function that should be called when a fatal error
mbed_official 0:51ac1d130fd4 1311 * has occured on the connection.
mbed_official 0:51ac1d130fd4 1312 *
mbed_official 0:51ac1d130fd4 1313 * @param pcb tcp_pcb to set the err callback
mbed_official 0:51ac1d130fd4 1314 * @param err callback function to call for this pcb when a fatal error
mbed_official 0:51ac1d130fd4 1315 * has occured on the connection
mbed_official 0:51ac1d130fd4 1316 */
mbed_official 0:51ac1d130fd4 1317 void
mbed_official 0:51ac1d130fd4 1318 tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
mbed_official 0:51ac1d130fd4 1319 {
mbed_official 0:51ac1d130fd4 1320 pcb->errf = err;
mbed_official 0:51ac1d130fd4 1321 }
mbed_official 0:51ac1d130fd4 1322
mbed_official 0:51ac1d130fd4 1323 /**
mbed_official 0:51ac1d130fd4 1324 * Used for specifying the function that should be called when a
mbed_official 0:51ac1d130fd4 1325 * LISTENing connection has been connected to another host.
mbed_official 0:51ac1d130fd4 1326 *
mbed_official 0:51ac1d130fd4 1327 * @param pcb tcp_pcb to set the accept callback
mbed_official 0:51ac1d130fd4 1328 * @param accept callback function to call for this pcb when LISTENing
mbed_official 0:51ac1d130fd4 1329 * connection has been connected to another host
mbed_official 0:51ac1d130fd4 1330 */
mbed_official 0:51ac1d130fd4 1331 void
mbed_official 0:51ac1d130fd4 1332 tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
mbed_official 0:51ac1d130fd4 1333 {
mbed_official 0:51ac1d130fd4 1334 pcb->accept = accept;
mbed_official 0:51ac1d130fd4 1335 }
mbed_official 0:51ac1d130fd4 1336 #endif /* LWIP_CALLBACK_API */
mbed_official 0:51ac1d130fd4 1337
mbed_official 0:51ac1d130fd4 1338
mbed_official 0:51ac1d130fd4 1339 /**
mbed_official 0:51ac1d130fd4 1340 * Used to specify the function that should be called periodically
mbed_official 0:51ac1d130fd4 1341 * from TCP. The interval is specified in terms of the TCP coarse
mbed_official 0:51ac1d130fd4 1342 * timer interval, which is called twice a second.
mbed_official 0:51ac1d130fd4 1343 *
mbed_official 0:51ac1d130fd4 1344 */
mbed_official 0:51ac1d130fd4 1345 void
mbed_official 0:51ac1d130fd4 1346 tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
mbed_official 0:51ac1d130fd4 1347 {
mbed_official 0:51ac1d130fd4 1348 #if LWIP_CALLBACK_API
mbed_official 0:51ac1d130fd4 1349 pcb->poll = poll;
mbed_official 0:51ac1d130fd4 1350 #else /* LWIP_CALLBACK_API */
mbed_official 0:51ac1d130fd4 1351 LWIP_UNUSED_ARG(poll);
mbed_official 0:51ac1d130fd4 1352 #endif /* LWIP_CALLBACK_API */
mbed_official 0:51ac1d130fd4 1353 pcb->pollinterval = interval;
mbed_official 0:51ac1d130fd4 1354 }
mbed_official 0:51ac1d130fd4 1355
mbed_official 0:51ac1d130fd4 1356 /**
mbed_official 0:51ac1d130fd4 1357 * Purges a TCP PCB. Removes any buffered data and frees the buffer memory
mbed_official 0:51ac1d130fd4 1358 * (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
mbed_official 0:51ac1d130fd4 1359 *
mbed_official 0:51ac1d130fd4 1360 * @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
mbed_official 0:51ac1d130fd4 1361 */
mbed_official 0:51ac1d130fd4 1362 void
mbed_official 0:51ac1d130fd4 1363 tcp_pcb_purge(struct tcp_pcb *pcb)
mbed_official 0:51ac1d130fd4 1364 {
mbed_official 0:51ac1d130fd4 1365 if (pcb->state != CLOSED &&
mbed_official 0:51ac1d130fd4 1366 pcb->state != TIME_WAIT &&
mbed_official 0:51ac1d130fd4 1367 pcb->state != LISTEN) {
mbed_official 0:51ac1d130fd4 1368
mbed_official 0:51ac1d130fd4 1369 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
mbed_official 0:51ac1d130fd4 1370
mbed_official 0:51ac1d130fd4 1371 #if TCP_LISTEN_BACKLOG
mbed_official 0:51ac1d130fd4 1372 if (pcb->state == SYN_RCVD) {
mbed_official 0:51ac1d130fd4 1373 /* Need to find the corresponding listen_pcb and decrease its accepts_pending */
mbed_official 0:51ac1d130fd4 1374 struct tcp_pcb_listen *lpcb;
mbed_official 0:51ac1d130fd4 1375 LWIP_ASSERT("tcp_pcb_purge: pcb->state == SYN_RCVD but tcp_listen_pcbs is NULL",
mbed_official 0:51ac1d130fd4 1376 tcp_listen_pcbs.listen_pcbs != NULL);
mbed_official 0:51ac1d130fd4 1377 for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
mbed_official 0:51ac1d130fd4 1378 if ((lpcb->local_port == pcb->local_port) &&
mbed_official 0:51ac1d130fd4 1379 (ip_addr_isany(&lpcb->local_ip) ||
mbed_official 0:51ac1d130fd4 1380 ip_addr_cmp(&pcb->local_ip, &lpcb->local_ip))) {
mbed_official 0:51ac1d130fd4 1381 /* port and address of the listen pcb match the timed-out pcb */
mbed_official 0:51ac1d130fd4 1382 LWIP_ASSERT("tcp_pcb_purge: listen pcb does not have accepts pending",
mbed_official 0:51ac1d130fd4 1383 lpcb->accepts_pending > 0);
mbed_official 0:51ac1d130fd4 1384 lpcb->accepts_pending--;
mbed_official 0:51ac1d130fd4 1385 break;
mbed_official 0:51ac1d130fd4 1386 }
mbed_official 0:51ac1d130fd4 1387 }
mbed_official 0:51ac1d130fd4 1388 }
mbed_official 0:51ac1d130fd4 1389 #endif /* TCP_LISTEN_BACKLOG */
mbed_official 0:51ac1d130fd4 1390
mbed_official 0:51ac1d130fd4 1391
mbed_official 0:51ac1d130fd4 1392 if (pcb->refused_data != NULL) {
mbed_official 0:51ac1d130fd4 1393 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
mbed_official 0:51ac1d130fd4 1394 pbuf_free(pcb->refused_data);
mbed_official 0:51ac1d130fd4 1395 pcb->refused_data = NULL;
mbed_official 0:51ac1d130fd4 1396 }
mbed_official 0:51ac1d130fd4 1397 if (pcb->unsent != NULL) {
mbed_official 0:51ac1d130fd4 1398 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
mbed_official 0:51ac1d130fd4 1399 }
mbed_official 0:51ac1d130fd4 1400 if (pcb->unacked != NULL) {
mbed_official 0:51ac1d130fd4 1401 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
mbed_official 0:51ac1d130fd4 1402 }
mbed_official 0:51ac1d130fd4 1403 #if TCP_QUEUE_OOSEQ
mbed_official 0:51ac1d130fd4 1404 if (pcb->ooseq != NULL) {
mbed_official 0:51ac1d130fd4 1405 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
mbed_official 0:51ac1d130fd4 1406 }
mbed_official 0:51ac1d130fd4 1407 tcp_segs_free(pcb->ooseq);
mbed_official 0:51ac1d130fd4 1408 pcb->ooseq = NULL;
mbed_official 0:51ac1d130fd4 1409 #endif /* TCP_QUEUE_OOSEQ */
mbed_official 0:51ac1d130fd4 1410
mbed_official 0:51ac1d130fd4 1411 /* Stop the retransmission timer as it will expect data on unacked
mbed_official 0:51ac1d130fd4 1412 queue if it fires */
mbed_official 0:51ac1d130fd4 1413 pcb->rtime = -1;
mbed_official 0:51ac1d130fd4 1414
mbed_official 0:51ac1d130fd4 1415 tcp_segs_free(pcb->unsent);
mbed_official 0:51ac1d130fd4 1416 tcp_segs_free(pcb->unacked);
mbed_official 0:51ac1d130fd4 1417 pcb->unacked = pcb->unsent = NULL;
mbed_official 0:51ac1d130fd4 1418 #if TCP_OVERSIZE
mbed_official 0:51ac1d130fd4 1419 pcb->unsent_oversize = 0;
mbed_official 0:51ac1d130fd4 1420 #endif /* TCP_OVERSIZE */
mbed_official 0:51ac1d130fd4 1421 }
mbed_official 0:51ac1d130fd4 1422 }
mbed_official 0:51ac1d130fd4 1423
mbed_official 0:51ac1d130fd4 1424 /**
mbed_official 0:51ac1d130fd4 1425 * Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
mbed_official 0:51ac1d130fd4 1426 *
mbed_official 0:51ac1d130fd4 1427 * @param pcblist PCB list to purge.
mbed_official 0:51ac1d130fd4 1428 * @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
mbed_official 0:51ac1d130fd4 1429 */
mbed_official 0:51ac1d130fd4 1430 void
mbed_official 0:51ac1d130fd4 1431 tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb)
mbed_official 0:51ac1d130fd4 1432 {
mbed_official 0:51ac1d130fd4 1433 TCP_RMV(pcblist, pcb);
mbed_official 0:51ac1d130fd4 1434
mbed_official 0:51ac1d130fd4 1435 tcp_pcb_purge(pcb);
mbed_official 0:51ac1d130fd4 1436
mbed_official 0:51ac1d130fd4 1437 /* if there is an outstanding delayed ACKs, send it */
mbed_official 0:51ac1d130fd4 1438 if (pcb->state != TIME_WAIT &&
mbed_official 0:51ac1d130fd4 1439 pcb->state != LISTEN &&
mbed_official 0:51ac1d130fd4 1440 pcb->flags & TF_ACK_DELAY) {
mbed_official 0:51ac1d130fd4 1441 pcb->flags |= TF_ACK_NOW;
mbed_official 0:51ac1d130fd4 1442 tcp_output(pcb);
mbed_official 0:51ac1d130fd4 1443 }
mbed_official 0:51ac1d130fd4 1444
mbed_official 0:51ac1d130fd4 1445 if (pcb->state != LISTEN) {
mbed_official 0:51ac1d130fd4 1446 LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
mbed_official 0:51ac1d130fd4 1447 LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
mbed_official 0:51ac1d130fd4 1448 #if TCP_QUEUE_OOSEQ
mbed_official 0:51ac1d130fd4 1449 LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
mbed_official 0:51ac1d130fd4 1450 #endif /* TCP_QUEUE_OOSEQ */
mbed_official 0:51ac1d130fd4 1451 }
mbed_official 0:51ac1d130fd4 1452
mbed_official 0:51ac1d130fd4 1453 pcb->state = CLOSED;
mbed_official 0:51ac1d130fd4 1454
mbed_official 0:51ac1d130fd4 1455 LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
mbed_official 0:51ac1d130fd4 1456 }
mbed_official 0:51ac1d130fd4 1457
mbed_official 0:51ac1d130fd4 1458 /**
mbed_official 0:51ac1d130fd4 1459 * Calculates a new initial sequence number for new connections.
mbed_official 0:51ac1d130fd4 1460 *
mbed_official 0:51ac1d130fd4 1461 * @return u32_t pseudo random sequence number
mbed_official 0:51ac1d130fd4 1462 */
mbed_official 0:51ac1d130fd4 1463 u32_t
mbed_official 0:51ac1d130fd4 1464 tcp_next_iss(void)
mbed_official 0:51ac1d130fd4 1465 {
mbed_official 0:51ac1d130fd4 1466 static u32_t iss = 6510;
mbed_official 0:51ac1d130fd4 1467
mbed_official 0:51ac1d130fd4 1468 iss += tcp_ticks; /* XXX */
mbed_official 0:51ac1d130fd4 1469 return iss;
mbed_official 0:51ac1d130fd4 1470 }
mbed_official 0:51ac1d130fd4 1471
mbed_official 0:51ac1d130fd4 1472 #if TCP_CALCULATE_EFF_SEND_MSS
mbed_official 0:51ac1d130fd4 1473 /**
mbed_official 0:51ac1d130fd4 1474 * Calcluates the effective send mss that can be used for a specific IP address
mbed_official 0:51ac1d130fd4 1475 * by using ip_route to determin the netif used to send to the address and
mbed_official 0:51ac1d130fd4 1476 * calculating the minimum of TCP_MSS and that netif's mtu (if set).
mbed_official 0:51ac1d130fd4 1477 */
mbed_official 0:51ac1d130fd4 1478 u16_t
mbed_official 0:51ac1d130fd4 1479 tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr)
mbed_official 0:51ac1d130fd4 1480 {
mbed_official 0:51ac1d130fd4 1481 u16_t mss_s;
mbed_official 0:51ac1d130fd4 1482 struct netif *outif;
mbed_official 0:51ac1d130fd4 1483
mbed_official 0:51ac1d130fd4 1484 outif = ip_route(addr);
mbed_official 0:51ac1d130fd4 1485 if ((outif != NULL) && (outif->mtu != 0)) {
mbed_official 0:51ac1d130fd4 1486 mss_s = outif->mtu - IP_HLEN - TCP_HLEN;
mbed_official 0:51ac1d130fd4 1487 /* RFC 1122, chap 4.2.2.6:
mbed_official 0:51ac1d130fd4 1488 * Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
mbed_official 0:51ac1d130fd4 1489 * We correct for TCP options in tcp_write(), and don't support IP options.
mbed_official 0:51ac1d130fd4 1490 */
mbed_official 0:51ac1d130fd4 1491 sendmss = LWIP_MIN(sendmss, mss_s);
mbed_official 0:51ac1d130fd4 1492 }
mbed_official 0:51ac1d130fd4 1493 return sendmss;
mbed_official 0:51ac1d130fd4 1494 }
mbed_official 0:51ac1d130fd4 1495 #endif /* TCP_CALCULATE_EFF_SEND_MSS */
mbed_official 0:51ac1d130fd4 1496
mbed_official 0:51ac1d130fd4 1497 const char*
mbed_official 0:51ac1d130fd4 1498 tcp_debug_state_str(enum tcp_state s)
mbed_official 0:51ac1d130fd4 1499 {
mbed_official 0:51ac1d130fd4 1500 return tcp_state_str[s];
mbed_official 0:51ac1d130fd4 1501 }
mbed_official 0:51ac1d130fd4 1502
mbed_official 0:51ac1d130fd4 1503 #if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
mbed_official 0:51ac1d130fd4 1504 /**
mbed_official 0:51ac1d130fd4 1505 * Print a tcp header for debugging purposes.
mbed_official 0:51ac1d130fd4 1506 *
mbed_official 0:51ac1d130fd4 1507 * @param tcphdr pointer to a struct tcp_hdr
mbed_official 0:51ac1d130fd4 1508 */
mbed_official 0:51ac1d130fd4 1509 void
mbed_official 0:51ac1d130fd4 1510 tcp_debug_print(struct tcp_hdr *tcphdr)
mbed_official 0:51ac1d130fd4 1511 {
mbed_official 0:51ac1d130fd4 1512 LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
mbed_official 0:51ac1d130fd4 1513 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mbed_official 0:51ac1d130fd4 1514 LWIP_DEBUGF(TCP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
mbed_official 0:51ac1d130fd4 1515 ntohs(tcphdr->src), ntohs(tcphdr->dest)));
mbed_official 0:51ac1d130fd4 1516 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mbed_official 0:51ac1d130fd4 1517 LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (seq no)\n",
mbed_official 0:51ac1d130fd4 1518 ntohl(tcphdr->seqno)));
mbed_official 0:51ac1d130fd4 1519 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mbed_official 0:51ac1d130fd4 1520 LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (ack no)\n",
mbed_official 0:51ac1d130fd4 1521 ntohl(tcphdr->ackno)));
mbed_official 0:51ac1d130fd4 1522 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mbed_official 0:51ac1d130fd4 1523 LWIP_DEBUGF(TCP_DEBUG, ("| %2"U16_F" | |%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"| %5"U16_F" | (hdrlen, flags (",
mbed_official 0:51ac1d130fd4 1524 TCPH_HDRLEN(tcphdr),
mbed_official 0:51ac1d130fd4 1525 TCPH_FLAGS(tcphdr) >> 5 & 1,
mbed_official 0:51ac1d130fd4 1526 TCPH_FLAGS(tcphdr) >> 4 & 1,
mbed_official 0:51ac1d130fd4 1527 TCPH_FLAGS(tcphdr) >> 3 & 1,
mbed_official 0:51ac1d130fd4 1528 TCPH_FLAGS(tcphdr) >> 2 & 1,
mbed_official 0:51ac1d130fd4 1529 TCPH_FLAGS(tcphdr) >> 1 & 1,
mbed_official 0:51ac1d130fd4 1530 TCPH_FLAGS(tcphdr) & 1,
mbed_official 0:51ac1d130fd4 1531 ntohs(tcphdr->wnd)));
mbed_official 0:51ac1d130fd4 1532 tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
mbed_official 0:51ac1d130fd4 1533 LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
mbed_official 0:51ac1d130fd4 1534 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mbed_official 0:51ac1d130fd4 1535 LWIP_DEBUGF(TCP_DEBUG, ("| 0x%04"X16_F" | %5"U16_F" | (chksum, urgp)\n",
mbed_official 0:51ac1d130fd4 1536 ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
mbed_official 0:51ac1d130fd4 1537 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mbed_official 0:51ac1d130fd4 1538 }
mbed_official 0:51ac1d130fd4 1539
mbed_official 0:51ac1d130fd4 1540 /**
mbed_official 0:51ac1d130fd4 1541 * Print a tcp state for debugging purposes.
mbed_official 0:51ac1d130fd4 1542 *
mbed_official 0:51ac1d130fd4 1543 * @param s enum tcp_state to print
mbed_official 0:51ac1d130fd4 1544 */
mbed_official 0:51ac1d130fd4 1545 void
mbed_official 0:51ac1d130fd4 1546 tcp_debug_print_state(enum tcp_state s)
mbed_official 0:51ac1d130fd4 1547 {
mbed_official 0:51ac1d130fd4 1548 LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
mbed_official 0:51ac1d130fd4 1549 }
mbed_official 0:51ac1d130fd4 1550
mbed_official 0:51ac1d130fd4 1551 /**
mbed_official 0:51ac1d130fd4 1552 * Print tcp flags for debugging purposes.
mbed_official 0:51ac1d130fd4 1553 *
mbed_official 0:51ac1d130fd4 1554 * @param flags tcp flags, all active flags are printed
mbed_official 0:51ac1d130fd4 1555 */
mbed_official 0:51ac1d130fd4 1556 void
mbed_official 0:51ac1d130fd4 1557 tcp_debug_print_flags(u8_t flags)
mbed_official 0:51ac1d130fd4 1558 {
mbed_official 0:51ac1d130fd4 1559 if (flags & TCP_FIN) {
mbed_official 0:51ac1d130fd4 1560 LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
mbed_official 0:51ac1d130fd4 1561 }
mbed_official 0:51ac1d130fd4 1562 if (flags & TCP_SYN) {
mbed_official 0:51ac1d130fd4 1563 LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
mbed_official 0:51ac1d130fd4 1564 }
mbed_official 0:51ac1d130fd4 1565 if (flags & TCP_RST) {
mbed_official 0:51ac1d130fd4 1566 LWIP_DEBUGF(TCP_DEBUG, ("RST "));
mbed_official 0:51ac1d130fd4 1567 }
mbed_official 0:51ac1d130fd4 1568 if (flags & TCP_PSH) {
mbed_official 0:51ac1d130fd4 1569 LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
mbed_official 0:51ac1d130fd4 1570 }
mbed_official 0:51ac1d130fd4 1571 if (flags & TCP_ACK) {
mbed_official 0:51ac1d130fd4 1572 LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
mbed_official 0:51ac1d130fd4 1573 }
mbed_official 0:51ac1d130fd4 1574 if (flags & TCP_URG) {
mbed_official 0:51ac1d130fd4 1575 LWIP_DEBUGF(TCP_DEBUG, ("URG "));
mbed_official 0:51ac1d130fd4 1576 }
mbed_official 0:51ac1d130fd4 1577 if (flags & TCP_ECE) {
mbed_official 0:51ac1d130fd4 1578 LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
mbed_official 0:51ac1d130fd4 1579 }
mbed_official 0:51ac1d130fd4 1580 if (flags & TCP_CWR) {
mbed_official 0:51ac1d130fd4 1581 LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
mbed_official 0:51ac1d130fd4 1582 }
mbed_official 0:51ac1d130fd4 1583 LWIP_DEBUGF(TCP_DEBUG, ("\n"));
mbed_official 0:51ac1d130fd4 1584 }
mbed_official 0:51ac1d130fd4 1585
mbed_official 0:51ac1d130fd4 1586 /**
mbed_official 0:51ac1d130fd4 1587 * Print all tcp_pcbs in every list for debugging purposes.
mbed_official 0:51ac1d130fd4 1588 */
mbed_official 0:51ac1d130fd4 1589 void
mbed_official 0:51ac1d130fd4 1590 tcp_debug_print_pcbs(void)
mbed_official 0:51ac1d130fd4 1591 {
mbed_official 0:51ac1d130fd4 1592 struct tcp_pcb *pcb;
mbed_official 0:51ac1d130fd4 1593 LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
mbed_official 0:51ac1d130fd4 1594 for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
mbed_official 0:51ac1d130fd4 1595 LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
mbed_official 0:51ac1d130fd4 1596 pcb->local_port, pcb->remote_port,
mbed_official 0:51ac1d130fd4 1597 pcb->snd_nxt, pcb->rcv_nxt));
mbed_official 0:51ac1d130fd4 1598 tcp_debug_print_state(pcb->state);
mbed_official 0:51ac1d130fd4 1599 }
mbed_official 0:51ac1d130fd4 1600 LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
mbed_official 0:51ac1d130fd4 1601 for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
mbed_official 0:51ac1d130fd4 1602 LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
mbed_official 0:51ac1d130fd4 1603 pcb->local_port, pcb->remote_port,
mbed_official 0:51ac1d130fd4 1604 pcb->snd_nxt, pcb->rcv_nxt));
mbed_official 0:51ac1d130fd4 1605 tcp_debug_print_state(pcb->state);
mbed_official 0:51ac1d130fd4 1606 }
mbed_official 0:51ac1d130fd4 1607 LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
mbed_official 0:51ac1d130fd4 1608 for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
mbed_official 0:51ac1d130fd4 1609 LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
mbed_official 0:51ac1d130fd4 1610 pcb->local_port, pcb->remote_port,
mbed_official 0:51ac1d130fd4 1611 pcb->snd_nxt, pcb->rcv_nxt));
mbed_official 0:51ac1d130fd4 1612 tcp_debug_print_state(pcb->state);
mbed_official 0:51ac1d130fd4 1613 }
mbed_official 0:51ac1d130fd4 1614 }
mbed_official 0:51ac1d130fd4 1615
mbed_official 0:51ac1d130fd4 1616 /**
mbed_official 0:51ac1d130fd4 1617 * Check state consistency of the tcp_pcb lists.
mbed_official 0:51ac1d130fd4 1618 */
mbed_official 0:51ac1d130fd4 1619 s16_t
mbed_official 0:51ac1d130fd4 1620 tcp_pcbs_sane(void)
mbed_official 0:51ac1d130fd4 1621 {
mbed_official 0:51ac1d130fd4 1622 struct tcp_pcb *pcb;
mbed_official 0:51ac1d130fd4 1623 for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
mbed_official 0:51ac1d130fd4 1624 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
mbed_official 0:51ac1d130fd4 1625 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
mbed_official 0:51ac1d130fd4 1626 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
mbed_official 0:51ac1d130fd4 1627 }
mbed_official 0:51ac1d130fd4 1628 for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
mbed_official 0:51ac1d130fd4 1629 LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
mbed_official 0:51ac1d130fd4 1630 }
mbed_official 0:51ac1d130fd4 1631 return 1;
mbed_official 0:51ac1d130fd4 1632 }
mbed_official 0:51ac1d130fd4 1633 #endif /* TCP_DEBUG */
mbed_official 0:51ac1d130fd4 1634
mbed_official 0:51ac1d130fd4 1635 #endif /* LWIP_TCP */