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Dependencies:   mbed

NetServices/lwip/core/tcp.c@1:f5ac63519541, 2014-03-05 (annotated)

Committer:
Michael J. Spencer
Date:
Wed Mar 05 06:14:02 2014 -0800
Revision:
1:f5ac63519541
Initial commit.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Michael J. Spencer 1:f5ac63519541 1 /**
Michael J. Spencer 1:f5ac63519541 2 * @file
Michael J. Spencer 1:f5ac63519541 3 * Transmission Control Protocol for IP
Michael J. Spencer 1:f5ac63519541 4 *
Michael J. Spencer 1:f5ac63519541 5 * This file contains common functions for the TCP implementation, such as functinos
Michael J. Spencer 1:f5ac63519541 6 * for manipulating the data structures and the TCP timer functions. TCP functions
Michael J. Spencer 1:f5ac63519541 7 * related to input and output is found in tcp_in.c and tcp_out.c respectively.
Michael J. Spencer 1:f5ac63519541 8 *
Michael J. Spencer 1:f5ac63519541 9 */
Michael J. Spencer 1:f5ac63519541 10
Michael J. Spencer 1:f5ac63519541 11 /*
Michael J. Spencer 1:f5ac63519541 12 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
Michael J. Spencer 1:f5ac63519541 13 * All rights reserved.
Michael J. Spencer 1:f5ac63519541 14 *
Michael J. Spencer 1:f5ac63519541 15 * Redistribution and use in source and binary forms, with or without modification,
Michael J. Spencer 1:f5ac63519541 16 * are permitted provided that the following conditions are met:
Michael J. Spencer 1:f5ac63519541 17 *
Michael J. Spencer 1:f5ac63519541 18 * 1. Redistributions of source code must retain the above copyright notice,
Michael J. Spencer 1:f5ac63519541 19 * this list of conditions and the following disclaimer.
Michael J. Spencer 1:f5ac63519541 20 * 2. Redistributions in binary form must reproduce the above copyright notice,
Michael J. Spencer 1:f5ac63519541 21 * this list of conditions and the following disclaimer in the documentation
Michael J. Spencer 1:f5ac63519541 22 * and/or other materials provided with the distribution.
Michael J. Spencer 1:f5ac63519541 23 * 3. The name of the author may not be used to endorse or promote products
Michael J. Spencer 1:f5ac63519541 24 * derived from this software without specific prior written permission.
Michael J. Spencer 1:f5ac63519541 25 *
Michael J. Spencer 1:f5ac63519541 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
Michael J. Spencer 1:f5ac63519541 27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
Michael J. Spencer 1:f5ac63519541 28 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
Michael J. Spencer 1:f5ac63519541 29 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
Michael J. Spencer 1:f5ac63519541 30 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
Michael J. Spencer 1:f5ac63519541 31 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
Michael J. Spencer 1:f5ac63519541 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
Michael J. Spencer 1:f5ac63519541 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
Michael J. Spencer 1:f5ac63519541 34 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
Michael J. Spencer 1:f5ac63519541 35 * OF SUCH DAMAGE.
Michael J. Spencer 1:f5ac63519541 36 *
Michael J. Spencer 1:f5ac63519541 37 * This file is part of the lwIP TCP/IP stack.
Michael J. Spencer 1:f5ac63519541 38 *
Michael J. Spencer 1:f5ac63519541 39 * Author: Adam Dunkels <adam@sics.se>
Michael J. Spencer 1:f5ac63519541 40 *
Michael J. Spencer 1:f5ac63519541 41 */
Michael J. Spencer 1:f5ac63519541 42
Michael J. Spencer 1:f5ac63519541 43 #include "lwip/opt.h"
Michael J. Spencer 1:f5ac63519541 44
Michael J. Spencer 1:f5ac63519541 45 #if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
Michael J. Spencer 1:f5ac63519541 46
Michael J. Spencer 1:f5ac63519541 47 #include "lwip/def.h"
Michael J. Spencer 1:f5ac63519541 48 #include "lwip/mem.h"
Michael J. Spencer 1:f5ac63519541 49 #include "lwip/memp.h"
Michael J. Spencer 1:f5ac63519541 50 #include "lwip/snmp.h"
Michael J. Spencer 1:f5ac63519541 51 #include "lwip/tcp.h"
Michael J. Spencer 1:f5ac63519541 52 #include "lwip/tcp_impl.h"
Michael J. Spencer 1:f5ac63519541 53 #include "lwip/debug.h"
Michael J. Spencer 1:f5ac63519541 54 #include "lwip/stats.h"
Michael J. Spencer 1:f5ac63519541 55
Michael J. Spencer 1:f5ac63519541 56 #include <string.h>
Michael J. Spencer 1:f5ac63519541 57
Michael J. Spencer 1:f5ac63519541 58 const char * const tcp_state_str[] = {
Michael J. Spencer 1:f5ac63519541 59 "CLOSED",
Michael J. Spencer 1:f5ac63519541 60 "LISTEN",
Michael J. Spencer 1:f5ac63519541 61 "SYN_SENT",
Michael J. Spencer 1:f5ac63519541 62 "SYN_RCVD",
Michael J. Spencer 1:f5ac63519541 63 "ESTABLISHED",
Michael J. Spencer 1:f5ac63519541 64 "FIN_WAIT_1",
Michael J. Spencer 1:f5ac63519541 65 "FIN_WAIT_2",
Michael J. Spencer 1:f5ac63519541 66 "CLOSE_WAIT",
Michael J. Spencer 1:f5ac63519541 67 "CLOSING",
Michael J. Spencer 1:f5ac63519541 68 "LAST_ACK",
Michael J. Spencer 1:f5ac63519541 69 "TIME_WAIT"
Michael J. Spencer 1:f5ac63519541 70 };
Michael J. Spencer 1:f5ac63519541 71
Michael J. Spencer 1:f5ac63519541 72 /* Incremented every coarse grained timer shot (typically every 500 ms). */
Michael J. Spencer 1:f5ac63519541 73 u32_t tcp_ticks;
Michael J. Spencer 1:f5ac63519541 74 const u8_t tcp_backoff[13] =
Michael J. Spencer 1:f5ac63519541 75 { 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
Michael J. Spencer 1:f5ac63519541 76 /* Times per slowtmr hits */
Michael J. Spencer 1:f5ac63519541 77 const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
Michael J. Spencer 1:f5ac63519541 78
Michael J. Spencer 1:f5ac63519541 79 /* The TCP PCB lists. */
Michael J. Spencer 1:f5ac63519541 80
Michael J. Spencer 1:f5ac63519541 81 /** List of all TCP PCBs bound but not yet (connected || listening) */
Michael J. Spencer 1:f5ac63519541 82 struct tcp_pcb *tcp_bound_pcbs;
Michael J. Spencer 1:f5ac63519541 83 /** List of all TCP PCBs in LISTEN state */
Michael J. Spencer 1:f5ac63519541 84 union tcp_listen_pcbs_t tcp_listen_pcbs;
Michael J. Spencer 1:f5ac63519541 85 /** List of all TCP PCBs that are in a state in which
Michael J. Spencer 1:f5ac63519541 86 * they accept or send data. */
Michael J. Spencer 1:f5ac63519541 87 struct tcp_pcb *tcp_active_pcbs;
Michael J. Spencer 1:f5ac63519541 88 /** List of all TCP PCBs in TIME-WAIT state */
Michael J. Spencer 1:f5ac63519541 89 struct tcp_pcb *tcp_tw_pcbs;
Michael J. Spencer 1:f5ac63519541 90
Michael J. Spencer 1:f5ac63519541 91 #define NUM_TCP_PCB_LISTS 4
Michael J. Spencer 1:f5ac63519541 92 #define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
Michael J. Spencer 1:f5ac63519541 93 /** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
Michael J. Spencer 1:f5ac63519541 94 struct tcp_pcb **tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
Michael J. Spencer 1:f5ac63519541 95 &tcp_active_pcbs, &tcp_tw_pcbs};
Michael J. Spencer 1:f5ac63519541 96
Michael J. Spencer 1:f5ac63519541 97 /** Only used for temporary storage. */
Michael J. Spencer 1:f5ac63519541 98 struct tcp_pcb *tcp_tmp_pcb;
Michael J. Spencer 1:f5ac63519541 99
Michael J. Spencer 1:f5ac63519541 100 /** Timer counter to handle calling slow-timer from tcp_tmr() */
Michael J. Spencer 1:f5ac63519541 101 static u8_t tcp_timer;
Michael J. Spencer 1:f5ac63519541 102 static u16_t tcp_new_port(void);
Michael J. Spencer 1:f5ac63519541 103
Michael J. Spencer 1:f5ac63519541 104 /**
Michael J. Spencer 1:f5ac63519541 105 * Called periodically to dispatch TCP timers.
Michael J. Spencer 1:f5ac63519541 106 *
Michael J. Spencer 1:f5ac63519541 107 */
Michael J. Spencer 1:f5ac63519541 108 void
Michael J. Spencer 1:f5ac63519541 109 tcp_tmr(void)
Michael J. Spencer 1:f5ac63519541 110 {
Michael J. Spencer 1:f5ac63519541 111 /* Call tcp_fasttmr() every 250 ms */
Michael J. Spencer 1:f5ac63519541 112 tcp_fasttmr();
Michael J. Spencer 1:f5ac63519541 113
Michael J. Spencer 1:f5ac63519541 114 if (++tcp_timer & 1) {
Michael J. Spencer 1:f5ac63519541 115 /* Call tcp_tmr() every 500 ms, i.e., every other timer
Michael J. Spencer 1:f5ac63519541 116 tcp_tmr() is called. */
Michael J. Spencer 1:f5ac63519541 117 tcp_slowtmr();
Michael J. Spencer 1:f5ac63519541 118 }
Michael J. Spencer 1:f5ac63519541 119 }
Michael J. Spencer 1:f5ac63519541 120
Michael J. Spencer 1:f5ac63519541 121 /**
Michael J. Spencer 1:f5ac63519541 122 * Closes the TX side of a connection held by the PCB.
Michael J. Spencer 1:f5ac63519541 123 * For tcp_close(), a RST is sent if the application didn't receive all data
Michael J. Spencer 1:f5ac63519541 124 * (tcp_recved() not called for all data passed to recv callback).
Michael J. Spencer 1:f5ac63519541 125 *
Michael J. Spencer 1:f5ac63519541 126 * Listening pcbs are freed and may not be referenced any more.
Michael J. Spencer 1:f5ac63519541 127 * Connection pcbs are freed if not yet connected and may not be referenced
Michael J. Spencer 1:f5ac63519541 128 * any more. If a connection is established (at least SYN received or in
Michael J. Spencer 1:f5ac63519541 129 * a closing state), the connection is closed, and put in a closing state.
Michael J. Spencer 1:f5ac63519541 130 * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
Michael J. Spencer 1:f5ac63519541 131 * unsafe to reference it.
Michael J. Spencer 1:f5ac63519541 132 *
Michael J. Spencer 1:f5ac63519541 133 * @param pcb the tcp_pcb to close
Michael J. Spencer 1:f5ac63519541 134 * @return ERR_OK if connection has been closed
Michael J. Spencer 1:f5ac63519541 135 * another err_t if closing failed and pcb is not freed
Michael J. Spencer 1:f5ac63519541 136 */
Michael J. Spencer 1:f5ac63519541 137 static err_t
Michael J. Spencer 1:f5ac63519541 138 tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
Michael J. Spencer 1:f5ac63519541 139 {
Michael J. Spencer 1:f5ac63519541 140 err_t err;
Michael J. Spencer 1:f5ac63519541 141
Michael J. Spencer 1:f5ac63519541 142 if (rst_on_unacked_data && (pcb->state != LISTEN)) {
Michael J. Spencer 1:f5ac63519541 143 if ((pcb->refused_data != NULL) || (pcb->rcv_wnd != TCP_WND)) {
Michael J. Spencer 1:f5ac63519541 144 /* Not all data received by application, send RST to tell the remote
Michael J. Spencer 1:f5ac63519541 145 side about this. */
Michael J. Spencer 1:f5ac63519541 146 LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
Michael J. Spencer 1:f5ac63519541 147
Michael J. Spencer 1:f5ac63519541 148 /* don't call tcp_abort here: we must not deallocate the pcb since
Michael J. Spencer 1:f5ac63519541 149 that might not be expected when calling tcp_close */
Michael J. Spencer 1:f5ac63519541 150 tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
Michael J. Spencer 1:f5ac63519541 151 pcb->local_port, pcb->remote_port);
Michael J. Spencer 1:f5ac63519541 152
Michael J. Spencer 1:f5ac63519541 153 tcp_pcb_purge(pcb);
Michael J. Spencer 1:f5ac63519541 154
Michael J. Spencer 1:f5ac63519541 155 /* TODO: to which state do we move now? */
Michael J. Spencer 1:f5ac63519541 156
Michael J. Spencer 1:f5ac63519541 157 /* move to TIME_WAIT since we close actively */
Michael J. Spencer 1:f5ac63519541 158 TCP_RMV(&tcp_active_pcbs, pcb);
Michael J. Spencer 1:f5ac63519541 159 pcb->state = TIME_WAIT;
Michael J. Spencer 1:f5ac63519541 160 TCP_REG(&tcp_tw_pcbs, pcb);
Michael J. Spencer 1:f5ac63519541 161
Michael J. Spencer 1:f5ac63519541 162 return ERR_OK;
Michael J. Spencer 1:f5ac63519541 163 }
Michael J. Spencer 1:f5ac63519541 164 }
Michael J. Spencer 1:f5ac63519541 165
Michael J. Spencer 1:f5ac63519541 166 switch (pcb->state) {
Michael J. Spencer 1:f5ac63519541 167 case CLOSED:
Michael J. Spencer 1:f5ac63519541 168 /* Closing a pcb in the CLOSED state might seem erroneous,
Michael J. Spencer 1:f5ac63519541 169 * however, it is in this state once allocated and as yet unused
Michael J. Spencer 1:f5ac63519541 170 * and the user needs some way to free it should the need arise.
Michael J. Spencer 1:f5ac63519541 171 * Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
Michael J. Spencer 1:f5ac63519541 172 * or for a pcb that has been used and then entered the CLOSED state
Michael J. Spencer 1:f5ac63519541 173 * is erroneous, but this should never happen as the pcb has in those cases
Michael J. Spencer 1:f5ac63519541 174 * been freed, and so any remaining handles are bogus. */
Michael J. Spencer 1:f5ac63519541 175 err = ERR_OK;
Michael J. Spencer 1:f5ac63519541 176 TCP_RMV(&tcp_bound_pcbs, pcb);
Michael J. Spencer 1:f5ac63519541 177 memp_free(MEMP_TCP_PCB, pcb);
Michael J. Spencer 1:f5ac63519541 178 pcb = NULL;
Michael J. Spencer 1:f5ac63519541 179 break;
Michael J. Spencer 1:f5ac63519541 180 case LISTEN:
Michael J. Spencer 1:f5ac63519541 181 err = ERR_OK;
Michael J. Spencer 1:f5ac63519541 182 tcp_pcb_remove(&tcp_listen_pcbs.pcbs, pcb);
Michael J. Spencer 1:f5ac63519541 183 memp_free(MEMP_TCP_PCB_LISTEN, pcb);
Michael J. Spencer 1:f5ac63519541 184 pcb = NULL;
Michael J. Spencer 1:f5ac63519541 185 break;
Michael J. Spencer 1:f5ac63519541 186 case SYN_SENT:
Michael J. Spencer 1:f5ac63519541 187 err = ERR_OK;
Michael J. Spencer 1:f5ac63519541 188 tcp_pcb_remove(&tcp_active_pcbs, pcb);
Michael J. Spencer 1:f5ac63519541 189 memp_free(MEMP_TCP_PCB, pcb);
Michael J. Spencer 1:f5ac63519541 190 pcb = NULL;
Michael J. Spencer 1:f5ac63519541 191 snmp_inc_tcpattemptfails();
Michael J. Spencer 1:f5ac63519541 192 break;
Michael J. Spencer 1:f5ac63519541 193 case SYN_RCVD:
Michael J. Spencer 1:f5ac63519541 194 err = tcp_send_fin(pcb);
Michael J. Spencer 1:f5ac63519541 195 if (err == ERR_OK) {
Michael J. Spencer 1:f5ac63519541 196 snmp_inc_tcpattemptfails();
Michael J. Spencer 1:f5ac63519541 197 pcb->state = FIN_WAIT_1;
Michael J. Spencer 1:f5ac63519541 198 }
Michael J. Spencer 1:f5ac63519541 199 break;
Michael J. Spencer 1:f5ac63519541 200 case ESTABLISHED:
Michael J. Spencer 1:f5ac63519541 201 err = tcp_send_fin(pcb);
Michael J. Spencer 1:f5ac63519541 202 if (err == ERR_OK) {
Michael J. Spencer 1:f5ac63519541 203 snmp_inc_tcpestabresets();
Michael J. Spencer 1:f5ac63519541 204 pcb->state = FIN_WAIT_1;
Michael J. Spencer 1:f5ac63519541 205 }
Michael J. Spencer 1:f5ac63519541 206 break;
Michael J. Spencer 1:f5ac63519541 207 case CLOSE_WAIT:
Michael J. Spencer 1:f5ac63519541 208 err = tcp_send_fin(pcb);
Michael J. Spencer 1:f5ac63519541 209 if (err == ERR_OK) {
Michael J. Spencer 1:f5ac63519541 210 snmp_inc_tcpestabresets();
Michael J. Spencer 1:f5ac63519541 211 pcb->state = LAST_ACK;
Michael J. Spencer 1:f5ac63519541 212 }
Michael J. Spencer 1:f5ac63519541 213 break;
Michael J. Spencer 1:f5ac63519541 214 default:
Michael J. Spencer 1:f5ac63519541 215 /* Has already been closed, do nothing. */
Michael J. Spencer 1:f5ac63519541 216 err = ERR_OK;
Michael J. Spencer 1:f5ac63519541 217 pcb = NULL;
Michael J. Spencer 1:f5ac63519541 218 break;
Michael J. Spencer 1:f5ac63519541 219 }
Michael J. Spencer 1:f5ac63519541 220
Michael J. Spencer 1:f5ac63519541 221 if (pcb != NULL && err == ERR_OK) {
Michael J. Spencer 1:f5ac63519541 222 /* To ensure all data has been sent when tcp_close returns, we have
Michael J. Spencer 1:f5ac63519541 223 to make sure tcp_output doesn't fail.
Michael J. Spencer 1:f5ac63519541 224 Since we don't really have to ensure all data has been sent when tcp_close
Michael J. Spencer 1:f5ac63519541 225 returns (unsent data is sent from tcp timer functions, also), we don't care
Michael J. Spencer 1:f5ac63519541 226 for the return value of tcp_output for now. */
Michael J. Spencer 1:f5ac63519541 227 /* @todo: When implementing SO_LINGER, this must be changed somehow:
Michael J. Spencer 1:f5ac63519541 228 If SOF_LINGER is set, the data should be sent and acked before close returns.
Michael J. Spencer 1:f5ac63519541 229 This can only be valid for sequential APIs, not for the raw API. */
Michael J. Spencer 1:f5ac63519541 230 tcp_output(pcb);
Michael J. Spencer 1:f5ac63519541 231 }
Michael J. Spencer 1:f5ac63519541 232 return err;
Michael J. Spencer 1:f5ac63519541 233 }
Michael J. Spencer 1:f5ac63519541 234
Michael J. Spencer 1:f5ac63519541 235 /**
Michael J. Spencer 1:f5ac63519541 236 * Closes the connection held by the PCB.
Michael J. Spencer 1:f5ac63519541 237 *
Michael J. Spencer 1:f5ac63519541 238 * Listening pcbs are freed and may not be referenced any more.
Michael J. Spencer 1:f5ac63519541 239 * Connection pcbs are freed if not yet connected and may not be referenced
Michael J. Spencer 1:f5ac63519541 240 * any more. If a connection is established (at least SYN received or in
Michael J. Spencer 1:f5ac63519541 241 * a closing state), the connection is closed, and put in a closing state.
Michael J. Spencer 1:f5ac63519541 242 * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
Michael J. Spencer 1:f5ac63519541 243 * unsafe to reference it (unless an error is returned).
Michael J. Spencer 1:f5ac63519541 244 *
Michael J. Spencer 1:f5ac63519541 245 * @param pcb the tcp_pcb to close
Michael J. Spencer 1:f5ac63519541 246 * @return ERR_OK if connection has been closed
Michael J. Spencer 1:f5ac63519541 247 * another err_t if closing failed and pcb is not freed
Michael J. Spencer 1:f5ac63519541 248 */
Michael J. Spencer 1:f5ac63519541 249 err_t
Michael J. Spencer 1:f5ac63519541 250 tcp_close(struct tcp_pcb *pcb)
Michael J. Spencer 1:f5ac63519541 251 {
Michael J. Spencer 1:f5ac63519541 252 #if TCP_DEBUG
Michael J. Spencer 1:f5ac63519541 253 LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
Michael J. Spencer 1:f5ac63519541 254 tcp_debug_print_state(pcb->state);
Michael J. Spencer 1:f5ac63519541 255 #endif /* TCP_DEBUG */
Michael J. Spencer 1:f5ac63519541 256
Michael J. Spencer 1:f5ac63519541 257 if (pcb->state != LISTEN) {
Michael J. Spencer 1:f5ac63519541 258 /* Set a flag not to receive any more data... */
Michael J. Spencer 1:f5ac63519541 259 pcb->flags |= TF_RXCLOSED;
Michael J. Spencer 1:f5ac63519541 260 }
Michael J. Spencer 1:f5ac63519541 261 /* ... and close */
Michael J. Spencer 1:f5ac63519541 262 return tcp_close_shutdown(pcb, 1);
Michael J. Spencer 1:f5ac63519541 263 }
Michael J. Spencer 1:f5ac63519541 264
Michael J. Spencer 1:f5ac63519541 265 /**
Michael J. Spencer 1:f5ac63519541 266 * Causes all or part of a full-duplex connection of this PCB to be shut down.
Michael J. Spencer 1:f5ac63519541 267 * This doesn't deallocate the PCB!
Michael J. Spencer 1:f5ac63519541 268 *
Michael J. Spencer 1:f5ac63519541 269 * @param pcb PCB to shutdown
Michael J. Spencer 1:f5ac63519541 270 * @param shut_rx shut down receive side if this is != 0
Michael J. Spencer 1:f5ac63519541 271 * @param shut_tx shut down send side if this is != 0
Michael J. Spencer 1:f5ac63519541 272 * @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
Michael J. Spencer 1:f5ac63519541 273 * another err_t on error.
Michael J. Spencer 1:f5ac63519541 274 */
Michael J. Spencer 1:f5ac63519541 275 err_t
Michael J. Spencer 1:f5ac63519541 276 tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
Michael J. Spencer 1:f5ac63519541 277 {
Michael J. Spencer 1:f5ac63519541 278 if (pcb->state == LISTEN) {
Michael J. Spencer 1:f5ac63519541 279 return ERR_CONN;
Michael J. Spencer 1:f5ac63519541 280 }
Michael J. Spencer 1:f5ac63519541 281 if (shut_rx) {
Michael J. Spencer 1:f5ac63519541 282 /* shut down the receive side: free buffered data... */
Michael J. Spencer 1:f5ac63519541 283 if (pcb->refused_data != NULL) {
Michael J. Spencer 1:f5ac63519541 284 pbuf_free(pcb->refused_data);
Michael J. Spencer 1:f5ac63519541 285 pcb->refused_data = NULL;
Michael J. Spencer 1:f5ac63519541 286 }
Michael J. Spencer 1:f5ac63519541 287 /* ... and set a flag not to receive any more data */
Michael J. Spencer 1:f5ac63519541 288 pcb->flags |= TF_RXCLOSED;
Michael J. Spencer 1:f5ac63519541 289 }
Michael J. Spencer 1:f5ac63519541 290 if (shut_tx) {
Michael J. Spencer 1:f5ac63519541 291 /* This can't happen twice since if it succeeds, the pcb's state is changed.
Michael J. Spencer 1:f5ac63519541 292 Only close in these states as the others directly deallocate the PCB */
Michael J. Spencer 1:f5ac63519541 293 switch (pcb->state) {
Michael J. Spencer 1:f5ac63519541 294 case SYN_RCVD:
Michael J. Spencer 1:f5ac63519541 295 case ESTABLISHED:
Michael J. Spencer 1:f5ac63519541 296 case CLOSE_WAIT:
Michael J. Spencer 1:f5ac63519541 297 return tcp_close_shutdown(pcb, 0);
Michael J. Spencer 1:f5ac63519541 298 default:
Michael J. Spencer 1:f5ac63519541 299 /* don't shut down other states */
Michael J. Spencer 1:f5ac63519541 300 break;
Michael J. Spencer 1:f5ac63519541 301 }
Michael J. Spencer 1:f5ac63519541 302 }
Michael J. Spencer 1:f5ac63519541 303 /* @todo: return another err_t if not in correct state or already shut? */
Michael J. Spencer 1:f5ac63519541 304 return ERR_OK;
Michael J. Spencer 1:f5ac63519541 305 }
Michael J. Spencer 1:f5ac63519541 306
Michael J. Spencer 1:f5ac63519541 307 /**
Michael J. Spencer 1:f5ac63519541 308 * Abandons a connection and optionally sends a RST to the remote
Michael J. Spencer 1:f5ac63519541 309 * host. Deletes the local protocol control block. This is done when
Michael J. Spencer 1:f5ac63519541 310 * a connection is killed because of shortage of memory.
Michael J. Spencer 1:f5ac63519541 311 *
Michael J. Spencer 1:f5ac63519541 312 * @param pcb the tcp_pcb to abort
Michael J. Spencer 1:f5ac63519541 313 * @param reset boolean to indicate whether a reset should be sent
Michael J. Spencer 1:f5ac63519541 314 */
Michael J. Spencer 1:f5ac63519541 315 void
Michael J. Spencer 1:f5ac63519541 316 tcp_abandon(struct tcp_pcb *pcb, int reset)
Michael J. Spencer 1:f5ac63519541 317 {
Michael J. Spencer 1:f5ac63519541 318 u32_t seqno, ackno;
Michael J. Spencer 1:f5ac63519541 319 u16_t remote_port, local_port;
Michael J. Spencer 1:f5ac63519541 320 ip_addr_t remote_ip, local_ip;
Michael J. Spencer 1:f5ac63519541 321 #if LWIP_CALLBACK_API
Michael J. Spencer 1:f5ac63519541 322 tcp_err_fn errf;
Michael J. Spencer 1:f5ac63519541 323 #endif /* LWIP_CALLBACK_API */
Michael J. Spencer 1:f5ac63519541 324 void *errf_arg;
Michael J. Spencer 1:f5ac63519541 325
Michael J. Spencer 1:f5ac63519541 326 /* pcb->state LISTEN not allowed here */
Michael J. Spencer 1:f5ac63519541 327 LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
Michael J. Spencer 1:f5ac63519541 328 pcb->state != LISTEN);
Michael J. Spencer 1:f5ac63519541 329 /* Figure out on which TCP PCB list we are, and remove us. If we
Michael J. Spencer 1:f5ac63519541 330 are in an active state, call the receive function associated with
Michael J. Spencer 1:f5ac63519541 331 the PCB with a NULL argument, and send an RST to the remote end. */
Michael J. Spencer 1:f5ac63519541 332 if (pcb->state == TIME_WAIT) {
Michael J. Spencer 1:f5ac63519541 333 tcp_pcb_remove(&tcp_tw_pcbs, pcb);
Michael J. Spencer 1:f5ac63519541 334 memp_free(MEMP_TCP_PCB, pcb);
Michael J. Spencer 1:f5ac63519541 335 } else {
Michael J. Spencer 1:f5ac63519541 336 seqno = pcb->snd_nxt;
Michael J. Spencer 1:f5ac63519541 337 ackno = pcb->rcv_nxt;
Michael J. Spencer 1:f5ac63519541 338 ip_addr_copy(local_ip, pcb->local_ip);
Michael J. Spencer 1:f5ac63519541 339 ip_addr_copy(remote_ip, pcb->remote_ip);
Michael J. Spencer 1:f5ac63519541 340 local_port = pcb->local_port;
Michael J. Spencer 1:f5ac63519541 341 remote_port = pcb->remote_port;
Michael J. Spencer 1:f5ac63519541 342 #if LWIP_CALLBACK_API
Michael J. Spencer 1:f5ac63519541 343 errf = pcb->errf;
Michael J. Spencer 1:f5ac63519541 344 #endif /* LWIP_CALLBACK_API */
Michael J. Spencer 1:f5ac63519541 345 errf_arg = pcb->callback_arg;
Michael J. Spencer 1:f5ac63519541 346 tcp_pcb_remove(&tcp_active_pcbs, pcb);
Michael J. Spencer 1:f5ac63519541 347 if (pcb->unacked != NULL) {
Michael J. Spencer 1:f5ac63519541 348 tcp_segs_free(pcb->unacked);
Michael J. Spencer 1:f5ac63519541 349 }
Michael J. Spencer 1:f5ac63519541 350 if (pcb->unsent != NULL) {
Michael J. Spencer 1:f5ac63519541 351 tcp_segs_free(pcb->unsent);
Michael J. Spencer 1:f5ac63519541 352 }
Michael J. Spencer 1:f5ac63519541 353 #if TCP_QUEUE_OOSEQ
Michael J. Spencer 1:f5ac63519541 354 if (pcb->ooseq != NULL) {
Michael J. Spencer 1:f5ac63519541 355 tcp_segs_free(pcb->ooseq);
Michael J. Spencer 1:f5ac63519541 356 }
Michael J. Spencer 1:f5ac63519541 357 #endif /* TCP_QUEUE_OOSEQ */
Michael J. Spencer 1:f5ac63519541 358 memp_free(MEMP_TCP_PCB, pcb);
Michael J. Spencer 1:f5ac63519541 359 TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
Michael J. Spencer 1:f5ac63519541 360 if (reset) {
Michael J. Spencer 1:f5ac63519541 361 LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
Michael J. Spencer 1:f5ac63519541 362 tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port);
Michael J. Spencer 1:f5ac63519541 363 }
Michael J. Spencer 1:f5ac63519541 364 }
Michael J. Spencer 1:f5ac63519541 365 }
Michael J. Spencer 1:f5ac63519541 366
Michael J. Spencer 1:f5ac63519541 367 /**
Michael J. Spencer 1:f5ac63519541 368 * Aborts the connection by sending a RST (reset) segment to the remote
Michael J. Spencer 1:f5ac63519541 369 * host. The pcb is deallocated. This function never fails.
Michael J. Spencer 1:f5ac63519541 370 *
Michael J. Spencer 1:f5ac63519541 371 * ATTENTION: When calling this from one of the TCP callbacks, make
Michael J. Spencer 1:f5ac63519541 372 * sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
Michael J. Spencer 1:f5ac63519541 373 * or you will risk accessing deallocated memory or memory leaks!
Michael J. Spencer 1:f5ac63519541 374 *
Michael J. Spencer 1:f5ac63519541 375 * @param pcb the tcp pcb to abort
Michael J. Spencer 1:f5ac63519541 376 */
Michael J. Spencer 1:f5ac63519541 377 void
Michael J. Spencer 1:f5ac63519541 378 tcp_abort(struct tcp_pcb *pcb)
Michael J. Spencer 1:f5ac63519541 379 {
Michael J. Spencer 1:f5ac63519541 380 tcp_abandon(pcb, 1);
Michael J. Spencer 1:f5ac63519541 381 }
Michael J. Spencer 1:f5ac63519541 382
Michael J. Spencer 1:f5ac63519541 383 /**
Michael J. Spencer 1:f5ac63519541 384 * Binds the connection to a local portnumber and IP address. If the
Michael J. Spencer 1:f5ac63519541 385 * IP address is not given (i.e., ipaddr == NULL), the IP address of
Michael J. Spencer 1:f5ac63519541 386 * the outgoing network interface is used instead.
Michael J. Spencer 1:f5ac63519541 387 *
Michael J. Spencer 1:f5ac63519541 388 * @param pcb the tcp_pcb to bind (no check is done whether this pcb is
Michael J. Spencer 1:f5ac63519541 389 * already bound!)
Michael J. Spencer 1:f5ac63519541 390 * @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
Michael J. Spencer 1:f5ac63519541 391 * to any local address
Michael J. Spencer 1:f5ac63519541 392 * @param port the local port to bind to
Michael J. Spencer 1:f5ac63519541 393 * @return ERR_USE if the port is already in use
Michael J. Spencer 1:f5ac63519541 394 * ERR_OK if bound
Michael J. Spencer 1:f5ac63519541 395 */
Michael J. Spencer 1:f5ac63519541 396 err_t
Michael J. Spencer 1:f5ac63519541 397 tcp_bind(struct tcp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
Michael J. Spencer 1:f5ac63519541 398 {
Michael J. Spencer 1:f5ac63519541 399 int i;
Michael J. Spencer 1:f5ac63519541 400 int max_pcb_list = NUM_TCP_PCB_LISTS;
Michael J. Spencer 1:f5ac63519541 401 struct tcp_pcb *cpcb;
Michael J. Spencer 1:f5ac63519541 402
Michael J. Spencer 1:f5ac63519541 403 LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
Michael J. Spencer 1:f5ac63519541 404
Michael J. Spencer 1:f5ac63519541 405 #if SO_REUSE
Michael J. Spencer 1:f5ac63519541 406 /* Unless the REUSEADDR flag is set,
Michael J. Spencer 1:f5ac63519541 407 we have to check the pcbs in TIME-WAIT state, also.
Michael J. Spencer 1:f5ac63519541 408 We do not dump TIME_WAIT pcb's; they can still be matched by incoming
Michael J. Spencer 1:f5ac63519541 409 packets using both local and remote IP addresses and ports to distinguish.
Michael J. Spencer 1:f5ac63519541 410 */
Michael J. Spencer 1:f5ac63519541 411 #if SO_REUSE
Michael J. Spencer 1:f5ac63519541 412 if ((pcb->so_options & SOF_REUSEADDR) != 0) {
Michael J. Spencer 1:f5ac63519541 413 max_pcb_list = NUM_TCP_PCB_LISTS_NO_TIME_WAIT;
Michael J. Spencer 1:f5ac63519541 414 }
Michael J. Spencer 1:f5ac63519541 415 #endif /* SO_REUSE */
Michael J. Spencer 1:f5ac63519541 416 #endif /* SO_REUSE */
Michael J. Spencer 1:f5ac63519541 417
Michael J. Spencer 1:f5ac63519541 418 if (port == 0) {
Michael J. Spencer 1:f5ac63519541 419 port = tcp_new_port();
Michael J. Spencer 1:f5ac63519541 420 }
Michael J. Spencer 1:f5ac63519541 421
Michael J. Spencer 1:f5ac63519541 422 /* Check if the address already is in use (on all lists) */
Michael J. Spencer 1:f5ac63519541 423 for (i = 0; i < max_pcb_list; i++) {
Michael J. Spencer 1:f5ac63519541 424 for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
Michael J. Spencer 1:f5ac63519541 425 if (cpcb->local_port == port) {
Michael J. Spencer 1:f5ac63519541 426 #if SO_REUSE
Michael J. Spencer 1:f5ac63519541 427 /* Omit checking for the same port if both pcbs have REUSEADDR set.
Michael J. Spencer 1:f5ac63519541 428 For SO_REUSEADDR, the duplicate-check for a 5-tuple is done in
Michael J. Spencer 1:f5ac63519541 429 tcp_connect. */
Michael J. Spencer 1:f5ac63519541 430 if (((pcb->so_options & SOF_REUSEADDR) == 0) ||
Michael J. Spencer 1:f5ac63519541 431 ((cpcb->so_options & SOF_REUSEADDR) == 0))
Michael J. Spencer 1:f5ac63519541 432 #endif /* SO_REUSE */
Michael J. Spencer 1:f5ac63519541 433 {
Michael J. Spencer 1:f5ac63519541 434 if (ip_addr_isany(&(cpcb->local_ip)) ||
Michael J. Spencer 1:f5ac63519541 435 ip_addr_isany(ipaddr) ||
Michael J. Spencer 1:f5ac63519541 436 ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
Michael J. Spencer 1:f5ac63519541 437 return ERR_USE;
Michael J. Spencer 1:f5ac63519541 438 }
Michael J. Spencer 1:f5ac63519541 439 }
Michael J. Spencer 1:f5ac63519541 440 }
Michael J. Spencer 1:f5ac63519541 441 }
Michael J. Spencer 1:f5ac63519541 442 }
Michael J. Spencer 1:f5ac63519541 443
Michael J. Spencer 1:f5ac63519541 444 if (!ip_addr_isany(ipaddr)) {
Michael J. Spencer 1:f5ac63519541 445 pcb->local_ip = *ipaddr;
Michael J. Spencer 1:f5ac63519541 446 }
Michael J. Spencer 1:f5ac63519541 447 pcb->local_port = port;
Michael J. Spencer 1:f5ac63519541 448 TCP_REG(&tcp_bound_pcbs, pcb);
Michael J. Spencer 1:f5ac63519541 449 LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
Michael J. Spencer 1:f5ac63519541 450 return ERR_OK;
Michael J. Spencer 1:f5ac63519541 451 }
Michael J. Spencer 1:f5ac63519541 452 #if LWIP_CALLBACK_API
Michael J. Spencer 1:f5ac63519541 453 /**
Michael J. Spencer 1:f5ac63519541 454 * Default accept callback if no accept callback is specified by the user.
Michael J. Spencer 1:f5ac63519541 455 */
Michael J. Spencer 1:f5ac63519541 456 static err_t
Michael J. Spencer 1:f5ac63519541 457 tcp_accept_null(void *arg, struct tcp_pcb *pcb, err_t err)
Michael J. Spencer 1:f5ac63519541 458 {
Michael J. Spencer 1:f5ac63519541 459 LWIP_UNUSED_ARG(arg);
Michael J. Spencer 1:f5ac63519541 460 LWIP_UNUSED_ARG(pcb);
Michael J. Spencer 1:f5ac63519541 461 LWIP_UNUSED_ARG(err);
Michael J. Spencer 1:f5ac63519541 462
Michael J. Spencer 1:f5ac63519541 463 return ERR_ABRT;
Michael J. Spencer 1:f5ac63519541 464 }
Michael J. Spencer 1:f5ac63519541 465 #endif /* LWIP_CALLBACK_API */
Michael J. Spencer 1:f5ac63519541 466
Michael J. Spencer 1:f5ac63519541 467 /**
Michael J. Spencer 1:f5ac63519541 468 * Set the state of the connection to be LISTEN, which means that it
Michael J. Spencer 1:f5ac63519541 469 * is able to accept incoming connections. The protocol control block
Michael J. Spencer 1:f5ac63519541 470 * is reallocated in order to consume less memory. Setting the
Michael J. Spencer 1:f5ac63519541 471 * connection to LISTEN is an irreversible process.
Michael J. Spencer 1:f5ac63519541 472 *
Michael J. Spencer 1:f5ac63519541 473 * @param pcb the original tcp_pcb
Michael J. Spencer 1:f5ac63519541 474 * @param backlog the incoming connections queue limit
Michael J. Spencer 1:f5ac63519541 475 * @return tcp_pcb used for listening, consumes less memory.
Michael J. Spencer 1:f5ac63519541 476 *
Michael J. Spencer 1:f5ac63519541 477 * @note The original tcp_pcb is freed. This function therefore has to be
Michael J. Spencer 1:f5ac63519541 478 * called like this:
Michael J. Spencer 1:f5ac63519541 479 * tpcb = tcp_listen(tpcb);
Michael J. Spencer 1:f5ac63519541 480 */
Michael J. Spencer 1:f5ac63519541 481 struct tcp_pcb *
Michael J. Spencer 1:f5ac63519541 482 tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
Michael J. Spencer 1:f5ac63519541 483 {
Michael J. Spencer 1:f5ac63519541 484 struct tcp_pcb_listen *lpcb;
Michael J. Spencer 1:f5ac63519541 485
Michael J. Spencer 1:f5ac63519541 486 LWIP_UNUSED_ARG(backlog);
Michael J. Spencer 1:f5ac63519541 487 LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL);
Michael J. Spencer 1:f5ac63519541 488
Michael J. Spencer 1:f5ac63519541 489 /* already listening? */
Michael J. Spencer 1:f5ac63519541 490 if (pcb->state == LISTEN) {
Michael J. Spencer 1:f5ac63519541 491 return pcb;
Michael J. Spencer 1:f5ac63519541 492 }
Michael J. Spencer 1:f5ac63519541 493 #if SO_REUSE
Michael J. Spencer 1:f5ac63519541 494 if ((pcb->so_options & SOF_REUSEADDR) != 0) {
Michael J. Spencer 1:f5ac63519541 495 /* Since SOF_REUSEADDR allows reusing a local address before the pcb's usage
Michael J. Spencer 1:f5ac63519541 496 is declared (listen-/connection-pcb), we have to make sure now that
Michael J. Spencer 1:f5ac63519541 497 this port is only used once for every local IP. */
Michael J. Spencer 1:f5ac63519541 498 for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
Michael J. Spencer 1:f5ac63519541 499 if (lpcb->local_port == pcb->local_port) {
Michael J. Spencer 1:f5ac63519541 500 if (ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
Michael J. Spencer 1:f5ac63519541 501 /* this address/port is already used */
Michael J. Spencer 1:f5ac63519541 502 return NULL;
Michael J. Spencer 1:f5ac63519541 503 }
Michael J. Spencer 1:f5ac63519541 504 }
Michael J. Spencer 1:f5ac63519541 505 }
Michael J. Spencer 1:f5ac63519541 506 }
Michael J. Spencer 1:f5ac63519541 507 #endif /* SO_REUSE */
Michael J. Spencer 1:f5ac63519541 508 lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
Michael J. Spencer 1:f5ac63519541 509 if (lpcb == NULL) {
Michael J. Spencer 1:f5ac63519541 510 return NULL;
Michael J. Spencer 1:f5ac63519541 511 }
Michael J. Spencer 1:f5ac63519541 512 lpcb->callback_arg = pcb->callback_arg;
Michael J. Spencer 1:f5ac63519541 513 lpcb->local_port = pcb->local_port;
Michael J. Spencer 1:f5ac63519541 514 lpcb->state = LISTEN;
Michael J. Spencer 1:f5ac63519541 515 lpcb->prio = pcb->prio;
Michael J. Spencer 1:f5ac63519541 516 lpcb->so_options = pcb->so_options;
Michael J. Spencer 1:f5ac63519541 517 lpcb->so_options |= SOF_ACCEPTCONN;
Michael J. Spencer 1:f5ac63519541 518 lpcb->ttl = pcb->ttl;
Michael J. Spencer 1:f5ac63519541 519 lpcb->tos = pcb->tos;
Michael J. Spencer 1:f5ac63519541 520 ip_addr_copy(lpcb->local_ip, pcb->local_ip);
Michael J. Spencer 1:f5ac63519541 521 TCP_RMV(&tcp_bound_pcbs, pcb);
Michael J. Spencer 1:f5ac63519541 522 memp_free(MEMP_TCP_PCB, pcb);
Michael J. Spencer 1:f5ac63519541 523 #if LWIP_CALLBACK_API
Michael J. Spencer 1:f5ac63519541 524 lpcb->accept = tcp_accept_null;
Michael J. Spencer 1:f5ac63519541 525 #endif /* LWIP_CALLBACK_API */
Michael J. Spencer 1:f5ac63519541 526 #if TCP_LISTEN_BACKLOG
Michael J. Spencer 1:f5ac63519541 527 lpcb->accepts_pending = 0;
Michael J. Spencer 1:f5ac63519541 528 lpcb->backlog = (backlog ? backlog : 1);
Michael J. Spencer 1:f5ac63519541 529 #endif /* TCP_LISTEN_BACKLOG */
Michael J. Spencer 1:f5ac63519541 530 TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
Michael J. Spencer 1:f5ac63519541 531 return (struct tcp_pcb *)lpcb;
Michael J. Spencer 1:f5ac63519541 532 }
Michael J. Spencer 1:f5ac63519541 533
Michael J. Spencer 1:f5ac63519541 534 /**
Michael J. Spencer 1:f5ac63519541 535 * Update the state that tracks the available window space to advertise.
Michael J. Spencer 1:f5ac63519541 536 *
Michael J. Spencer 1:f5ac63519541 537 * Returns how much extra window would be advertised if we sent an
Michael J. Spencer 1:f5ac63519541 538 * update now.
Michael J. Spencer 1:f5ac63519541 539 */
Michael J. Spencer 1:f5ac63519541 540 u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
Michael J. Spencer 1:f5ac63519541 541 {
Michael J. Spencer 1:f5ac63519541 542 u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
Michael J. Spencer 1:f5ac63519541 543
Michael J. Spencer 1:f5ac63519541 544 if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) {
Michael J. Spencer 1:f5ac63519541 545 /* we can advertise more window */
Michael J. Spencer 1:f5ac63519541 546 pcb->rcv_ann_wnd = pcb->rcv_wnd;
Michael J. Spencer 1:f5ac63519541 547 return new_right_edge - pcb->rcv_ann_right_edge;
Michael J. Spencer 1:f5ac63519541 548 } else {
Michael J. Spencer 1:f5ac63519541 549 if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
Michael J. Spencer 1:f5ac63519541 550 /* Can happen due to other end sending out of advertised window,
Michael J. Spencer 1:f5ac63519541 551 * but within actual available (but not yet advertised) window */
Michael J. Spencer 1:f5ac63519541 552 pcb->rcv_ann_wnd = 0;
Michael J. Spencer 1:f5ac63519541 553 } else {
Michael J. Spencer 1:f5ac63519541 554 /* keep the right edge of window constant */
Michael J. Spencer 1:f5ac63519541 555 u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
Michael J. Spencer 1:f5ac63519541 556 LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff", new_rcv_ann_wnd <= 0xffff);
Michael J. Spencer 1:f5ac63519541 557 pcb->rcv_ann_wnd = (u16_t)new_rcv_ann_wnd;
Michael J. Spencer 1:f5ac63519541 558 }
Michael J. Spencer 1:f5ac63519541 559 return 0;
Michael J. Spencer 1:f5ac63519541 560 }
Michael J. Spencer 1:f5ac63519541 561 }
Michael J. Spencer 1:f5ac63519541 562
Michael J. Spencer 1:f5ac63519541 563 /**
Michael J. Spencer 1:f5ac63519541 564 * This function should be called by the application when it has
Michael J. Spencer 1:f5ac63519541 565 * processed the data. The purpose is to advertise a larger window
Michael J. Spencer 1:f5ac63519541 566 * when the data has been processed.
Michael J. Spencer 1:f5ac63519541 567 *
Michael J. Spencer 1:f5ac63519541 568 * @param pcb the tcp_pcb for which data is read
Michael J. Spencer 1:f5ac63519541 569 * @param len the amount of bytes that have been read by the application
Michael J. Spencer 1:f5ac63519541 570 */
Michael J. Spencer 1:f5ac63519541 571 void
Michael J. Spencer 1:f5ac63519541 572 tcp_recved(struct tcp_pcb *pcb, u16_t len)
Michael J. Spencer 1:f5ac63519541 573 {
Michael J. Spencer 1:f5ac63519541 574 int wnd_inflation;
Michael J. Spencer 1:f5ac63519541 575
Michael J. Spencer 1:f5ac63519541 576 LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
Michael J. Spencer 1:f5ac63519541 577 len <= 0xffff - pcb->rcv_wnd );
Michael J. Spencer 1:f5ac63519541 578
Michael J. Spencer 1:f5ac63519541 579 pcb->rcv_wnd += len;
Michael J. Spencer 1:f5ac63519541 580 if (pcb->rcv_wnd > TCP_WND) {
Michael J. Spencer 1:f5ac63519541 581 pcb->rcv_wnd = TCP_WND;
Michael J. Spencer 1:f5ac63519541 582 }
Michael J. Spencer 1:f5ac63519541 583
Michael J. Spencer 1:f5ac63519541 584 wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
Michael J. Spencer 1:f5ac63519541 585
Michael J. Spencer 1:f5ac63519541 586 /* If the change in the right edge of window is significant (default
Michael J. Spencer 1:f5ac63519541 587 * watermark is TCP_WND/4), then send an explicit update now.
Michael J. Spencer 1:f5ac63519541 588 * Otherwise wait for a packet to be sent in the normal course of
Michael J. Spencer 1:f5ac63519541 589 * events (or more window to be available later) */
Michael J. Spencer 1:f5ac63519541 590 if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
Michael J. Spencer 1:f5ac63519541 591 tcp_ack_now(pcb);
Michael J. Spencer 1:f5ac63519541 592 tcp_output(pcb);
Michael J. Spencer 1:f5ac63519541 593 }
Michael J. Spencer 1:f5ac63519541 594
Michael J. Spencer 1:f5ac63519541 595 LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
Michael J. Spencer 1:f5ac63519541 596 len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
Michael J. Spencer 1:f5ac63519541 597 }
Michael J. Spencer 1:f5ac63519541 598
Michael J. Spencer 1:f5ac63519541 599 /**
Michael J. Spencer 1:f5ac63519541 600 * A nastly hack featuring 'goto' statements that allocates a
Michael J. Spencer 1:f5ac63519541 601 * new TCP local port.
Michael J. Spencer 1:f5ac63519541 602 *
Michael J. Spencer 1:f5ac63519541 603 * @return a new (free) local TCP port number
Michael J. Spencer 1:f5ac63519541 604 */
Michael J. Spencer 1:f5ac63519541 605 static u16_t
Michael J. Spencer 1:f5ac63519541 606 tcp_new_port(void)
Michael J. Spencer 1:f5ac63519541 607 {
Michael J. Spencer 1:f5ac63519541 608 int i;
Michael J. Spencer 1:f5ac63519541 609 struct tcp_pcb *pcb;
Michael J. Spencer 1:f5ac63519541 610 #ifndef TCP_LOCAL_PORT_RANGE_START
Michael J. Spencer 1:f5ac63519541 611 #define TCP_LOCAL_PORT_RANGE_START 4096
Michael J. Spencer 1:f5ac63519541 612 #define TCP_LOCAL_PORT_RANGE_END 0x7fff
Michael J. Spencer 1:f5ac63519541 613 #endif
Michael J. Spencer 1:f5ac63519541 614 static u16_t port = TCP_LOCAL_PORT_RANGE_START;
Michael J. Spencer 1:f5ac63519541 615
Michael J. Spencer 1:f5ac63519541 616 again:
Michael J. Spencer 1:f5ac63519541 617 if (++port > TCP_LOCAL_PORT_RANGE_END) {
Michael J. Spencer 1:f5ac63519541 618 port = TCP_LOCAL_PORT_RANGE_START;
Michael J. Spencer 1:f5ac63519541 619 }
Michael J. Spencer 1:f5ac63519541 620 /* Check all PCB lists. */
Michael J. Spencer 1:f5ac63519541 621 for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
Michael J. Spencer 1:f5ac63519541 622 for(pcb = *tcp_pcb_lists[i]; pcb != NULL; pcb = pcb->next) {
Michael J. Spencer 1:f5ac63519541 623 if (pcb->local_port == port) {
Michael J. Spencer 1:f5ac63519541 624 goto again;
Michael J. Spencer 1:f5ac63519541 625 }
Michael J. Spencer 1:f5ac63519541 626 }
Michael J. Spencer 1:f5ac63519541 627 }
Michael J. Spencer 1:f5ac63519541 628 return port;
Michael J. Spencer 1:f5ac63519541 629 }
Michael J. Spencer 1:f5ac63519541 630
Michael J. Spencer 1:f5ac63519541 631 /**
Michael J. Spencer 1:f5ac63519541 632 * Connects to another host. The function given as the "connected"
Michael J. Spencer 1:f5ac63519541 633 * argument will be called when the connection has been established.
Michael J. Spencer 1:f5ac63519541 634 *
Michael J. Spencer 1:f5ac63519541 635 * @param pcb the tcp_pcb used to establish the connection
Michael J. Spencer 1:f5ac63519541 636 * @param ipaddr the remote ip address to connect to
Michael J. Spencer 1:f5ac63519541 637 * @param port the remote tcp port to connect to
Michael J. Spencer 1:f5ac63519541 638 * @param connected callback function to call when connected (or on error)
Michael J. Spencer 1:f5ac63519541 639 * @return ERR_VAL if invalid arguments are given
Michael J. Spencer 1:f5ac63519541 640 * ERR_OK if connect request has been sent
Michael J. Spencer 1:f5ac63519541 641 * other err_t values if connect request couldn't be sent
Michael J. Spencer 1:f5ac63519541 642 */
Michael J. Spencer 1:f5ac63519541 643 err_t
Michael J. Spencer 1:f5ac63519541 644 tcp_connect(struct tcp_pcb *pcb, ip_addr_t *ipaddr, u16_t port,
Michael J. Spencer 1:f5ac63519541 645 tcp_connected_fn connected)
Michael J. Spencer 1:f5ac63519541 646 {
Michael J. Spencer 1:f5ac63519541 647 err_t ret;
Michael J. Spencer 1:f5ac63519541 648 u32_t iss;
Michael J. Spencer 1:f5ac63519541 649
Michael J. Spencer 1:f5ac63519541 650 LWIP_ERROR("tcp_connect: can only connected from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
Michael J. Spencer 1:f5ac63519541 651
Michael J. Spencer 1:f5ac63519541 652 LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
Michael J. Spencer 1:f5ac63519541 653 if (ipaddr != NULL) {
Michael J. Spencer 1:f5ac63519541 654 pcb->remote_ip = *ipaddr;
Michael J. Spencer 1:f5ac63519541 655 } else {
Michael J. Spencer 1:f5ac63519541 656 return ERR_VAL;
Michael J. Spencer 1:f5ac63519541 657 }
Michael J. Spencer 1:f5ac63519541 658 pcb->remote_port = port;
Michael J. Spencer 1:f5ac63519541 659
Michael J. Spencer 1:f5ac63519541 660 /* check if we have a route to the remote host */
Michael J. Spencer 1:f5ac63519541 661 if (ip_addr_isany(&(pcb->local_ip))) {
Michael J. Spencer 1:f5ac63519541 662 /* no local IP address set, yet. */
Michael J. Spencer 1:f5ac63519541 663 struct netif *netif = ip_route(&(pcb->remote_ip));
Michael J. Spencer 1:f5ac63519541 664 if (netif == NULL) {
Michael J. Spencer 1:f5ac63519541 665 /* Don't even try to send a SYN packet if we have no route
Michael J. Spencer 1:f5ac63519541 666 since that will fail. */
Michael J. Spencer 1:f5ac63519541 667 return ERR_RTE;
Michael J. Spencer 1:f5ac63519541 668 }
Michael J. Spencer 1:f5ac63519541 669 /* Use the netif's IP address as local address. */
Michael J. Spencer 1:f5ac63519541 670 ip_addr_copy(pcb->local_ip, netif->ip_addr);
Michael J. Spencer 1:f5ac63519541 671 }
Michael J. Spencer 1:f5ac63519541 672
Michael J. Spencer 1:f5ac63519541 673 if (pcb->local_port == 0) {
Michael J. Spencer 1:f5ac63519541 674 pcb->local_port = tcp_new_port();
Michael J. Spencer 1:f5ac63519541 675 }
Michael J. Spencer 1:f5ac63519541 676 #if SO_REUSE
Michael J. Spencer 1:f5ac63519541 677 if ((pcb->so_options & SOF_REUSEADDR) != 0) {
Michael J. Spencer 1:f5ac63519541 678 /* Since SOF_REUSEADDR allows reusing a local address, we have to make sure
Michael J. Spencer 1:f5ac63519541 679 now that the 5-tuple is unique. */
Michael J. Spencer 1:f5ac63519541 680 struct tcp_pcb *cpcb;
Michael J. Spencer 1:f5ac63519541 681 int i;
Michael J. Spencer 1:f5ac63519541 682 /* Don't check listen PCBs, check bound-, active- and TIME-WAIT PCBs. */
Michael J. Spencer 1:f5ac63519541 683 for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
Michael J. Spencer 1:f5ac63519541 684 for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
Michael J. Spencer 1:f5ac63519541 685 if ((cpcb->local_port == pcb->local_port) &&
Michael J. Spencer 1:f5ac63519541 686 (cpcb->remote_port == port) &&
Michael J. Spencer 1:f5ac63519541 687 ip_addr_cmp(&cpcb->local_ip, &pcb->local_ip) &&
Michael J. Spencer 1:f5ac63519541 688 ip_addr_cmp(&cpcb->remote_ip, ipaddr)) {
Michael J. Spencer 1:f5ac63519541 689 /* linux returns EISCONN here, but ERR_USE should be OK for us */
Michael J. Spencer 1:f5ac63519541 690 return ERR_USE;
Michael J. Spencer 1:f5ac63519541 691 }
Michael J. Spencer 1:f5ac63519541 692 }
Michael J. Spencer 1:f5ac63519541 693 }
Michael J. Spencer 1:f5ac63519541 694 }
Michael J. Spencer 1:f5ac63519541 695 #endif /* SO_REUSE */
Michael J. Spencer 1:f5ac63519541 696 iss = tcp_next_iss();
Michael J. Spencer 1:f5ac63519541 697 pcb->rcv_nxt = 0;
Michael J. Spencer 1:f5ac63519541 698 pcb->snd_nxt = iss;
Michael J. Spencer 1:f5ac63519541 699 pcb->lastack = iss - 1;
Michael J. Spencer 1:f5ac63519541 700 pcb->snd_lbb = iss - 1;
Michael J. Spencer 1:f5ac63519541 701 pcb->rcv_wnd = TCP_WND;
Michael J. Spencer 1:f5ac63519541 702 pcb->rcv_ann_wnd = TCP_WND;
Michael J. Spencer 1:f5ac63519541 703 pcb->rcv_ann_right_edge = pcb->rcv_nxt;
Michael J. Spencer 1:f5ac63519541 704 pcb->snd_wnd = TCP_WND;
Michael J. Spencer 1:f5ac63519541 705 /* As initial send MSS, we use TCP_MSS but limit it to 536.
Michael J. Spencer 1:f5ac63519541 706 The send MSS is updated when an MSS option is received. */
Michael J. Spencer 1:f5ac63519541 707 pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
Michael J. Spencer 1:f5ac63519541 708 #if TCP_CALCULATE_EFF_SEND_MSS
Michael J. Spencer 1:f5ac63519541 709 pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr);
Michael J. Spencer 1:f5ac63519541 710 #endif /* TCP_CALCULATE_EFF_SEND_MSS */
Michael J. Spencer 1:f5ac63519541 711 pcb->cwnd = 1;
Michael J. Spencer 1:f5ac63519541 712 pcb->ssthresh = pcb->mss * 10;
Michael J. Spencer 1:f5ac63519541 713 #if LWIP_CALLBACK_API
Michael J. Spencer 1:f5ac63519541 714 pcb->connected = connected;
Michael J. Spencer 1:f5ac63519541 715 #else /* LWIP_CALLBACK_API */
Michael J. Spencer 1:f5ac63519541 716 LWIP_UNUSED_ARG(connected);
Michael J. Spencer 1:f5ac63519541 717 #endif /* LWIP_CALLBACK_API */
Michael J. Spencer 1:f5ac63519541 718
Michael J. Spencer 1:f5ac63519541 719 LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
Michael J. Spencer 1:f5ac63519541 720
Michael J. Spencer 1:f5ac63519541 721 /* Send a SYN together with the MSS option. */
Michael J. Spencer 1:f5ac63519541 722 ret = tcp_enqueue_flags(pcb, TCP_SYN);
Michael J. Spencer 1:f5ac63519541 723 if (ret == ERR_OK) {
Michael J. Spencer 1:f5ac63519541 724 /* SYN segment was enqueued, changed the pcbs state now */
Michael J. Spencer 1:f5ac63519541 725 pcb->state = SYN_SENT;
Michael J. Spencer 1:f5ac63519541 726 TCP_RMV(&tcp_bound_pcbs, pcb);
Michael J. Spencer 1:f5ac63519541 727 TCP_REG(&tcp_active_pcbs, pcb);
Michael J. Spencer 1:f5ac63519541 728 snmp_inc_tcpactiveopens();
Michael J. Spencer 1:f5ac63519541 729
Michael J. Spencer 1:f5ac63519541 730 tcp_output(pcb);
Michael J. Spencer 1:f5ac63519541 731 }
Michael J. Spencer 1:f5ac63519541 732 return ret;
Michael J. Spencer 1:f5ac63519541 733 }
Michael J. Spencer 1:f5ac63519541 734
Michael J. Spencer 1:f5ac63519541 735 /**
Michael J. Spencer 1:f5ac63519541 736 * Called every 500 ms and implements the retransmission timer and the timer that
Michael J. Spencer 1:f5ac63519541 737 * removes PCBs that have been in TIME-WAIT for enough time. It also increments
Michael J. Spencer 1:f5ac63519541 738 * various timers such as the inactivity timer in each PCB.
Michael J. Spencer 1:f5ac63519541 739 *
Michael J. Spencer 1:f5ac63519541 740 * Automatically called from tcp_tmr().
Michael J. Spencer 1:f5ac63519541 741 */
Michael J. Spencer 1:f5ac63519541 742 void
Michael J. Spencer 1:f5ac63519541 743 tcp_slowtmr(void)
Michael J. Spencer 1:f5ac63519541 744 {
Michael J. Spencer 1:f5ac63519541 745 struct tcp_pcb *pcb, *pcb2, *prev;
Michael J. Spencer 1:f5ac63519541 746 u16_t eff_wnd;
Michael J. Spencer 1:f5ac63519541 747 u8_t pcb_remove; /* flag if a PCB should be removed */
Michael J. Spencer 1:f5ac63519541 748 u8_t pcb_reset; /* flag if a RST should be sent when removing */
Michael J. Spencer 1:f5ac63519541 749 err_t err;
Michael J. Spencer 1:f5ac63519541 750
Michael J. Spencer 1:f5ac63519541 751 tcp_debug_print_pcbs(); //DG
Michael J. Spencer 1:f5ac63519541 752
Michael J. Spencer 1:f5ac63519541 753 err = ERR_OK;
Michael J. Spencer 1:f5ac63519541 754
Michael J. Spencer 1:f5ac63519541 755 ++tcp_ticks;
Michael J. Spencer 1:f5ac63519541 756 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: tcp_ticks=%"U32_F"\n", tcp_ticks));
Michael J. Spencer 1:f5ac63519541 757
Michael J. Spencer 1:f5ac63519541 758 /* Steps through all of the active PCBs. */
Michael J. Spencer 1:f5ac63519541 759 prev = NULL;
Michael J. Spencer 1:f5ac63519541 760 pcb = tcp_active_pcbs;
Michael J. Spencer 1:f5ac63519541 761 if (pcb == NULL) {
Michael J. Spencer 1:f5ac63519541 762 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
Michael J. Spencer 1:f5ac63519541 763 }
Michael J. Spencer 1:f5ac63519541 764 while (pcb != NULL) {
Michael J. Spencer 1:f5ac63519541 765 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
Michael J. Spencer 1:f5ac63519541 766 LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
Michael J. Spencer 1:f5ac63519541 767 LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
Michael J. Spencer 1:f5ac63519541 768 LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
Michael J. Spencer 1:f5ac63519541 769
Michael J. Spencer 1:f5ac63519541 770 pcb_remove = 0;
Michael J. Spencer 1:f5ac63519541 771 pcb_reset = 0;
Michael J. Spencer 1:f5ac63519541 772
Michael J. Spencer 1:f5ac63519541 773 if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
Michael J. Spencer 1:f5ac63519541 774 ++pcb_remove;
Michael J. Spencer 1:f5ac63519541 775 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
Michael J. Spencer 1:f5ac63519541 776 }
Michael J. Spencer 1:f5ac63519541 777 else if (pcb->nrtx == TCP_MAXRTX) {
Michael J. Spencer 1:f5ac63519541 778 ++pcb_remove;
Michael J. Spencer 1:f5ac63519541 779 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
Michael J. Spencer 1:f5ac63519541 780 } else {
Michael J. Spencer 1:f5ac63519541 781 if (pcb->persist_backoff > 0) {
Michael J. Spencer 1:f5ac63519541 782 /* If snd_wnd is zero, use persist timer to send 1 byte probes
Michael J. Spencer 1:f5ac63519541 783 * instead of using the standard retransmission mechanism. */
Michael J. Spencer 1:f5ac63519541 784 pcb->persist_cnt++;
Michael J. Spencer 1:f5ac63519541 785 if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) {
Michael J. Spencer 1:f5ac63519541 786 pcb->persist_cnt = 0;
Michael J. Spencer 1:f5ac63519541 787 if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
Michael J. Spencer 1:f5ac63519541 788 pcb->persist_backoff++;
Michael J. Spencer 1:f5ac63519541 789 }
Michael J. Spencer 1:f5ac63519541 790 tcp_zero_window_probe(pcb);
Michael J. Spencer 1:f5ac63519541 791 }
Michael J. Spencer 1:f5ac63519541 792 } else {
Michael J. Spencer 1:f5ac63519541 793 /* Increase the retransmission timer if it is running */
Michael J. Spencer 1:f5ac63519541 794 if(pcb->rtime >= 0)
Michael J. Spencer 1:f5ac63519541 795 ++pcb->rtime;
Michael J. Spencer 1:f5ac63519541 796
Michael J. Spencer 1:f5ac63519541 797 if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
Michael J. Spencer 1:f5ac63519541 798 /* Time for a retransmission. */
Michael J. Spencer 1:f5ac63519541 799 LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
Michael J. Spencer 1:f5ac63519541 800 " pcb->rto %"S16_F"\n",
Michael J. Spencer 1:f5ac63519541 801 pcb->rtime, pcb->rto));
Michael J. Spencer 1:f5ac63519541 802
Michael J. Spencer 1:f5ac63519541 803 /* Double retransmission time-out unless we are trying to
Michael J. Spencer 1:f5ac63519541 804 * connect to somebody (i.e., we are in SYN_SENT). */
Michael J. Spencer 1:f5ac63519541 805 if (pcb->state != SYN_SENT) {
Michael J. Spencer 1:f5ac63519541 806 pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
Michael J. Spencer 1:f5ac63519541 807 }
Michael J. Spencer 1:f5ac63519541 808
Michael J. Spencer 1:f5ac63519541 809 /* Reset the retransmission timer. */
Michael J. Spencer 1:f5ac63519541 810 pcb->rtime = 0;
Michael J. Spencer 1:f5ac63519541 811
Michael J. Spencer 1:f5ac63519541 812 /* Reduce congestion window and ssthresh. */
Michael J. Spencer 1:f5ac63519541 813 eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
Michael J. Spencer 1:f5ac63519541 814 pcb->ssthresh = eff_wnd >> 1;
Michael J. Spencer 1:f5ac63519541 815 if (pcb->ssthresh < (pcb->mss << 1)) {
Michael J. Spencer 1:f5ac63519541 816 pcb->ssthresh = (pcb->mss << 1);
Michael J. Spencer 1:f5ac63519541 817 }
Michael J. Spencer 1:f5ac63519541 818 pcb->cwnd = pcb->mss;
Michael J. Spencer 1:f5ac63519541 819 LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F
Michael J. Spencer 1:f5ac63519541 820 " ssthresh %"U16_F"\n",
Michael J. Spencer 1:f5ac63519541 821 pcb->cwnd, pcb->ssthresh));
Michael J. Spencer 1:f5ac63519541 822
Michael J. Spencer 1:f5ac63519541 823 /* The following needs to be called AFTER cwnd is set to one
Michael J. Spencer 1:f5ac63519541 824 mss - STJ */
Michael J. Spencer 1:f5ac63519541 825 tcp_rexmit_rto(pcb);
Michael J. Spencer 1:f5ac63519541 826 }
Michael J. Spencer 1:f5ac63519541 827 }
Michael J. Spencer 1:f5ac63519541 828 }
Michael J. Spencer 1:f5ac63519541 829 /* Check if this PCB has stayed too long in FIN-WAIT-2 */
Michael J. Spencer 1:f5ac63519541 830 if (pcb->state == FIN_WAIT_2) {
Michael J. Spencer 1:f5ac63519541 831 if ((u32_t)(tcp_ticks - pcb->tmr) >
Michael J. Spencer 1:f5ac63519541 832 TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
Michael J. Spencer 1:f5ac63519541 833 ++pcb_remove;
Michael J. Spencer 1:f5ac63519541 834 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
Michael J. Spencer 1:f5ac63519541 835 }
Michael J. Spencer 1:f5ac63519541 836 }
Michael J. Spencer 1:f5ac63519541 837
Michael J. Spencer 1:f5ac63519541 838 /* Check if KEEPALIVE should be sent */
Michael J. Spencer 1:f5ac63519541 839 if((pcb->so_options & SOF_KEEPALIVE) &&
Michael J. Spencer 1:f5ac63519541 840 ((pcb->state == ESTABLISHED) ||
Michael J. Spencer 1:f5ac63519541 841 (pcb->state == CLOSE_WAIT))) {
Michael J. Spencer 1:f5ac63519541 842 #if LWIP_TCP_KEEPALIVE
Michael J. Spencer 1:f5ac63519541 843 if((u32_t)(tcp_ticks - pcb->tmr) >
Michael J. Spencer 1:f5ac63519541 844 (pcb->keep_idle + (pcb->keep_cnt*pcb->keep_intvl))
Michael J. Spencer 1:f5ac63519541 845 / TCP_SLOW_INTERVAL)
Michael J. Spencer 1:f5ac63519541 846 #else
Michael J. Spencer 1:f5ac63519541 847 if((u32_t)(tcp_ticks - pcb->tmr) >
Michael J. Spencer 1:f5ac63519541 848 (pcb->keep_idle + TCP_MAXIDLE) / TCP_SLOW_INTERVAL)
Michael J. Spencer 1:f5ac63519541 849 #endif /* LWIP_TCP_KEEPALIVE */
Michael J. Spencer 1:f5ac63519541 850 {
Michael J. Spencer 1:f5ac63519541 851 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n",
Michael J. Spencer 1:f5ac63519541 852 ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
Michael J. Spencer 1:f5ac63519541 853 ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
Michael J. Spencer 1:f5ac63519541 854
Michael J. Spencer 1:f5ac63519541 855 ++pcb_remove;
Michael J. Spencer 1:f5ac63519541 856 ++pcb_reset;
Michael J. Spencer 1:f5ac63519541 857 }
Michael J. Spencer 1:f5ac63519541 858 #if LWIP_TCP_KEEPALIVE
Michael J. Spencer 1:f5ac63519541 859 else if((u32_t)(tcp_ticks - pcb->tmr) >
Michael J. Spencer 1:f5ac63519541 860 (pcb->keep_idle + pcb->keep_cnt_sent * pcb->keep_intvl)
Michael J. Spencer 1:f5ac63519541 861 / TCP_SLOW_INTERVAL)
Michael J. Spencer 1:f5ac63519541 862 #else
Michael J. Spencer 1:f5ac63519541 863 else if((u32_t)(tcp_ticks - pcb->tmr) >
Michael J. Spencer 1:f5ac63519541 864 (pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEPINTVL_DEFAULT)
Michael J. Spencer 1:f5ac63519541 865 / TCP_SLOW_INTERVAL)
Michael J. Spencer 1:f5ac63519541 866 #endif /* LWIP_TCP_KEEPALIVE */
Michael J. Spencer 1:f5ac63519541 867 {
Michael J. Spencer 1:f5ac63519541 868 tcp_keepalive(pcb);
Michael J. Spencer 1:f5ac63519541 869 pcb->keep_cnt_sent++;
Michael J. Spencer 1:f5ac63519541 870 }
Michael J. Spencer 1:f5ac63519541 871 }
Michael J. Spencer 1:f5ac63519541 872
Michael J. Spencer 1:f5ac63519541 873 /* If this PCB has queued out of sequence data, but has been
Michael J. Spencer 1:f5ac63519541 874 inactive for too long, will drop the data (it will eventually
Michael J. Spencer 1:f5ac63519541 875 be retransmitted). */
Michael J. Spencer 1:f5ac63519541 876 #if TCP_QUEUE_OOSEQ
Michael J. Spencer 1:f5ac63519541 877 if (pcb->ooseq != NULL &&
Michael J. Spencer 1:f5ac63519541 878 (u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) {
Michael J. Spencer 1:f5ac63519541 879 tcp_segs_free(pcb->ooseq);
Michael J. Spencer 1:f5ac63519541 880 pcb->ooseq = NULL;
Michael J. Spencer 1:f5ac63519541 881 LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
Michael J. Spencer 1:f5ac63519541 882 }
Michael J. Spencer 1:f5ac63519541 883 #endif /* TCP_QUEUE_OOSEQ */
Michael J. Spencer 1:f5ac63519541 884
Michael J. Spencer 1:f5ac63519541 885 /* Check if this PCB has stayed too long in SYN-RCVD */
Michael J. Spencer 1:f5ac63519541 886 if (pcb->state == SYN_RCVD) {
Michael J. Spencer 1:f5ac63519541 887 if ((u32_t)(tcp_ticks - pcb->tmr) >
Michael J. Spencer 1:f5ac63519541 888 TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
Michael J. Spencer 1:f5ac63519541 889 ++pcb_remove;
Michael J. Spencer 1:f5ac63519541 890 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
Michael J. Spencer 1:f5ac63519541 891 }
Michael J. Spencer 1:f5ac63519541 892 }
Michael J. Spencer 1:f5ac63519541 893
Michael J. Spencer 1:f5ac63519541 894 /* Check if this PCB has stayed too long in LAST-ACK */
Michael J. Spencer 1:f5ac63519541 895 if (pcb->state == LAST_ACK) {
Michael J. Spencer 1:f5ac63519541 896 if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
Michael J. Spencer 1:f5ac63519541 897 ++pcb_remove;
Michael J. Spencer 1:f5ac63519541 898 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
Michael J. Spencer 1:f5ac63519541 899 }
Michael J. Spencer 1:f5ac63519541 900 }
Michael J. Spencer 1:f5ac63519541 901
Michael J. Spencer 1:f5ac63519541 902 /* If the PCB should be removed, do it. */
Michael J. Spencer 1:f5ac63519541 903 if (pcb_remove) {
Michael J. Spencer 1:f5ac63519541 904 tcp_pcb_purge(pcb);
Michael J. Spencer 1:f5ac63519541 905 /* Remove PCB from tcp_active_pcbs list. */
Michael J. Spencer 1:f5ac63519541 906 if (prev != NULL) {
Michael J. Spencer 1:f5ac63519541 907 LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
Michael J. Spencer 1:f5ac63519541 908 prev->next = pcb->next;
Michael J. Spencer 1:f5ac63519541 909 } else {
Michael J. Spencer 1:f5ac63519541 910 /* This PCB was the first. */
Michael J. Spencer 1:f5ac63519541 911 LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
Michael J. Spencer 1:f5ac63519541 912 tcp_active_pcbs = pcb->next;
Michael J. Spencer 1:f5ac63519541 913 }
Michael J. Spencer 1:f5ac63519541 914
Michael J. Spencer 1:f5ac63519541 915 TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_ABRT);
Michael J. Spencer 1:f5ac63519541 916 if (pcb_reset) {
Michael J. Spencer 1:f5ac63519541 917 tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
Michael J. Spencer 1:f5ac63519541 918 pcb->local_port, pcb->remote_port);
Michael J. Spencer 1:f5ac63519541 919 }
Michael J. Spencer 1:f5ac63519541 920
Michael J. Spencer 1:f5ac63519541 921 pcb2 = pcb->next;
Michael J. Spencer 1:f5ac63519541 922 memp_free(MEMP_TCP_PCB, pcb);
Michael J. Spencer 1:f5ac63519541 923 pcb = pcb2;
Michael J. Spencer 1:f5ac63519541 924 } else {
Michael J. Spencer 1:f5ac63519541 925 /* get the 'next' element now and work with 'prev' below (in case of abort) */
Michael J. Spencer 1:f5ac63519541 926 prev = pcb;
Michael J. Spencer 1:f5ac63519541 927 pcb = pcb->next;
Michael J. Spencer 1:f5ac63519541 928
Michael J. Spencer 1:f5ac63519541 929 /* We check if we should poll the connection. */
Michael J. Spencer 1:f5ac63519541 930 ++prev->polltmr;
Michael J. Spencer 1:f5ac63519541 931 if (prev->polltmr >= prev->pollinterval) {
Michael J. Spencer 1:f5ac63519541 932 prev->polltmr = 0;
Michael J. Spencer 1:f5ac63519541 933 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
Michael J. Spencer 1:f5ac63519541 934 TCP_EVENT_POLL(prev, err);
Michael J. Spencer 1:f5ac63519541 935 /* if err == ERR_ABRT, 'prev' is already deallocated */
Michael J. Spencer 1:f5ac63519541 936 if (err == ERR_OK) {
Michael J. Spencer 1:f5ac63519541 937 tcp_output(prev);
Michael J. Spencer 1:f5ac63519541 938 }
Michael J. Spencer 1:f5ac63519541 939 }
Michael J. Spencer 1:f5ac63519541 940 }
Michael J. Spencer 1:f5ac63519541 941 }
Michael J. Spencer 1:f5ac63519541 942
Michael J. Spencer 1:f5ac63519541 943
Michael J. Spencer 1:f5ac63519541 944 /* Steps through all of the TIME-WAIT PCBs. */
Michael J. Spencer 1:f5ac63519541 945 prev = NULL;
Michael J. Spencer 1:f5ac63519541 946 pcb = tcp_tw_pcbs;
Michael J. Spencer 1:f5ac63519541 947 while (pcb != NULL) {
Michael J. Spencer 1:f5ac63519541 948 LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
Michael J. Spencer 1:f5ac63519541 949 pcb_remove = 0;
Michael J. Spencer 1:f5ac63519541 950
Michael J. Spencer 1:f5ac63519541 951 /* Check if this PCB has stayed long enough in TIME-WAIT */
Michael J. Spencer 1:f5ac63519541 952 if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
Michael J. Spencer 1:f5ac63519541 953 ++pcb_remove;
Michael J. Spencer 1:f5ac63519541 954 }
Michael J. Spencer 1:f5ac63519541 955
Michael J. Spencer 1:f5ac63519541 956
Michael J. Spencer 1:f5ac63519541 957
Michael J. Spencer 1:f5ac63519541 958 /* If the PCB should be removed, do it. */
Michael J. Spencer 1:f5ac63519541 959 if (pcb_remove) {
Michael J. Spencer 1:f5ac63519541 960 tcp_pcb_purge(pcb);
Michael J. Spencer 1:f5ac63519541 961 /* Remove PCB from tcp_tw_pcbs list. */
Michael J. Spencer 1:f5ac63519541 962 if (prev != NULL) {
Michael J. Spencer 1:f5ac63519541 963 LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
Michael J. Spencer 1:f5ac63519541 964 prev->next = pcb->next;
Michael J. Spencer 1:f5ac63519541 965 } else {
Michael J. Spencer 1:f5ac63519541 966 /* This PCB was the first. */
Michael J. Spencer 1:f5ac63519541 967 LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
Michael J. Spencer 1:f5ac63519541 968 tcp_tw_pcbs = pcb->next;
Michael J. Spencer 1:f5ac63519541 969 }
Michael J. Spencer 1:f5ac63519541 970 pcb2 = pcb->next;
Michael J. Spencer 1:f5ac63519541 971 memp_free(MEMP_TCP_PCB, pcb);
Michael J. Spencer 1:f5ac63519541 972 pcb = pcb2;
Michael J. Spencer 1:f5ac63519541 973 } else {
Michael J. Spencer 1:f5ac63519541 974 prev = pcb;
Michael J. Spencer 1:f5ac63519541 975 pcb = pcb->next;
Michael J. Spencer 1:f5ac63519541 976 }
Michael J. Spencer 1:f5ac63519541 977 }
Michael J. Spencer 1:f5ac63519541 978 }
Michael J. Spencer 1:f5ac63519541 979
Michael J. Spencer 1:f5ac63519541 980 /**
Michael J. Spencer 1:f5ac63519541 981 * Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
Michael J. Spencer 1:f5ac63519541 982 * "refused" by upper layer (application) and sends delayed ACKs.
Michael J. Spencer 1:f5ac63519541 983 *
Michael J. Spencer 1:f5ac63519541 984 * Automatically called from tcp_tmr().
Michael J. Spencer 1:f5ac63519541 985 */
Michael J. Spencer 1:f5ac63519541 986 void
Michael J. Spencer 1:f5ac63519541 987 tcp_fasttmr(void)
Michael J. Spencer 1:f5ac63519541 988 {
Michael J. Spencer 1:f5ac63519541 989 struct tcp_pcb *pcb = tcp_active_pcbs;
Michael J. Spencer 1:f5ac63519541 990
Michael J. Spencer 1:f5ac63519541 991 while(pcb != NULL) {
Michael J. Spencer 1:f5ac63519541 992 struct tcp_pcb *next = pcb->next;
Michael J. Spencer 1:f5ac63519541 993 /* If there is data which was previously "refused" by upper layer */
Michael J. Spencer 1:f5ac63519541 994 if (pcb->refused_data != NULL) {
Michael J. Spencer 1:f5ac63519541 995 /* Notify again application with data previously received. */
Michael J. Spencer 1:f5ac63519541 996 err_t err;
Michael J. Spencer 1:f5ac63519541 997 LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_fasttmr: notify kept packet\n"));
Michael J. Spencer 1:f5ac63519541 998 TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
Michael J. Spencer 1:f5ac63519541 999 if (err == ERR_OK) {
Michael J. Spencer 1:f5ac63519541 1000 pcb->refused_data = NULL;
Michael J. Spencer 1:f5ac63519541 1001 } else if (err == ERR_ABRT) {
Michael J. Spencer 1:f5ac63519541 1002 /* if err == ERR_ABRT, 'pcb' is already deallocated */
Michael J. Spencer 1:f5ac63519541 1003 pcb = NULL;
Michael J. Spencer 1:f5ac63519541 1004 }
Michael J. Spencer 1:f5ac63519541 1005 }
Michael J. Spencer 1:f5ac63519541 1006
Michael J. Spencer 1:f5ac63519541 1007 /* send delayed ACKs */
Michael J. Spencer 1:f5ac63519541 1008 if (pcb && (pcb->flags & TF_ACK_DELAY)) {
Michael J. Spencer 1:f5ac63519541 1009 LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
Michael J. Spencer 1:f5ac63519541 1010 tcp_ack_now(pcb);
Michael J. Spencer 1:f5ac63519541 1011 tcp_output(pcb);
Michael J. Spencer 1:f5ac63519541 1012 pcb->flags &= ~(TF_ACK_DELAY | TF_ACK_NOW);
Michael J. Spencer 1:f5ac63519541 1013 }
Michael J. Spencer 1:f5ac63519541 1014
Michael J. Spencer 1:f5ac63519541 1015 pcb = next;
Michael J. Spencer 1:f5ac63519541 1016 }
Michael J. Spencer 1:f5ac63519541 1017 }
Michael J. Spencer 1:f5ac63519541 1018
Michael J. Spencer 1:f5ac63519541 1019 /**
Michael J. Spencer 1:f5ac63519541 1020 * Deallocates a list of TCP segments (tcp_seg structures).
Michael J. Spencer 1:f5ac63519541 1021 *
Michael J. Spencer 1:f5ac63519541 1022 * @param seg tcp_seg list of TCP segments to free
Michael J. Spencer 1:f5ac63519541 1023 */
Michael J. Spencer 1:f5ac63519541 1024 void
Michael J. Spencer 1:f5ac63519541 1025 tcp_segs_free(struct tcp_seg *seg)
Michael J. Spencer 1:f5ac63519541 1026 {
Michael J. Spencer 1:f5ac63519541 1027 while (seg != NULL) {
Michael J. Spencer 1:f5ac63519541 1028 struct tcp_seg *next = seg->next;
Michael J. Spencer 1:f5ac63519541 1029 tcp_seg_free(seg);
Michael J. Spencer 1:f5ac63519541 1030 seg = next;
Michael J. Spencer 1:f5ac63519541 1031 }
Michael J. Spencer 1:f5ac63519541 1032 }
Michael J. Spencer 1:f5ac63519541 1033
Michael J. Spencer 1:f5ac63519541 1034 /**
Michael J. Spencer 1:f5ac63519541 1035 * Frees a TCP segment (tcp_seg structure).
Michael J. Spencer 1:f5ac63519541 1036 *
Michael J. Spencer 1:f5ac63519541 1037 * @param seg single tcp_seg to free
Michael J. Spencer 1:f5ac63519541 1038 */
Michael J. Spencer 1:f5ac63519541 1039 void
Michael J. Spencer 1:f5ac63519541 1040 tcp_seg_free(struct tcp_seg *seg)
Michael J. Spencer 1:f5ac63519541 1041 {
Michael J. Spencer 1:f5ac63519541 1042 if (seg != NULL) {
Michael J. Spencer 1:f5ac63519541 1043 if (seg->p != NULL) {
Michael J. Spencer 1:f5ac63519541 1044 pbuf_free(seg->p);
Michael J. Spencer 1:f5ac63519541 1045 #if TCP_DEBUG
Michael J. Spencer 1:f5ac63519541 1046 seg->p = NULL;
Michael J. Spencer 1:f5ac63519541 1047 #endif /* TCP_DEBUG */
Michael J. Spencer 1:f5ac63519541 1048 }
Michael J. Spencer 1:f5ac63519541 1049 memp_free(MEMP_TCP_SEG, seg);
Michael J. Spencer 1:f5ac63519541 1050 }
Michael J. Spencer 1:f5ac63519541 1051 }
Michael J. Spencer 1:f5ac63519541 1052
Michael J. Spencer 1:f5ac63519541 1053 /**
Michael J. Spencer 1:f5ac63519541 1054 * Sets the priority of a connection.
Michael J. Spencer 1:f5ac63519541 1055 *
Michael J. Spencer 1:f5ac63519541 1056 * @param pcb the tcp_pcb to manipulate
Michael J. Spencer 1:f5ac63519541 1057 * @param prio new priority
Michael J. Spencer 1:f5ac63519541 1058 */
Michael J. Spencer 1:f5ac63519541 1059 void
Michael J. Spencer 1:f5ac63519541 1060 tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
Michael J. Spencer 1:f5ac63519541 1061 {
Michael J. Spencer 1:f5ac63519541 1062 pcb->prio = prio;
Michael J. Spencer 1:f5ac63519541 1063 }
Michael J. Spencer 1:f5ac63519541 1064
Michael J. Spencer 1:f5ac63519541 1065 #if TCP_QUEUE_OOSEQ
Michael J. Spencer 1:f5ac63519541 1066 /**
Michael J. Spencer 1:f5ac63519541 1067 * Returns a copy of the given TCP segment.
Michael J. Spencer 1:f5ac63519541 1068 * The pbuf and data are not copied, only the pointers
Michael J. Spencer 1:f5ac63519541 1069 *
Michael J. Spencer 1:f5ac63519541 1070 * @param seg the old tcp_seg
Michael J. Spencer 1:f5ac63519541 1071 * @return a copy of seg
Michael J. Spencer 1:f5ac63519541 1072 */
Michael J. Spencer 1:f5ac63519541 1073 struct tcp_seg *
Michael J. Spencer 1:f5ac63519541 1074 tcp_seg_copy(struct tcp_seg *seg)
Michael J. Spencer 1:f5ac63519541 1075 {
Michael J. Spencer 1:f5ac63519541 1076 struct tcp_seg *cseg;
Michael J. Spencer 1:f5ac63519541 1077
Michael J. Spencer 1:f5ac63519541 1078 cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG);
Michael J. Spencer 1:f5ac63519541 1079 if (cseg == NULL) {
Michael J. Spencer 1:f5ac63519541 1080 return NULL;
Michael J. Spencer 1:f5ac63519541 1081 }
Michael J. Spencer 1:f5ac63519541 1082 SMEMCPY((u8_t *)cseg, (const u8_t *)seg, sizeof(struct tcp_seg));
Michael J. Spencer 1:f5ac63519541 1083 pbuf_ref(cseg->p);
Michael J. Spencer 1:f5ac63519541 1084 return cseg;
Michael J. Spencer 1:f5ac63519541 1085 }
Michael J. Spencer 1:f5ac63519541 1086 #endif /* TCP_QUEUE_OOSEQ */
Michael J. Spencer 1:f5ac63519541 1087
Michael J. Spencer 1:f5ac63519541 1088 #if LWIP_CALLBACK_API
Michael J. Spencer 1:f5ac63519541 1089 /**
Michael J. Spencer 1:f5ac63519541 1090 * Default receive callback that is called if the user didn't register
Michael J. Spencer 1:f5ac63519541 1091 * a recv callback for the pcb.
Michael J. Spencer 1:f5ac63519541 1092 */
Michael J. Spencer 1:f5ac63519541 1093 err_t
Michael J. Spencer 1:f5ac63519541 1094 tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
Michael J. Spencer 1:f5ac63519541 1095 {
Michael J. Spencer 1:f5ac63519541 1096 LWIP_UNUSED_ARG(arg);
Michael J. Spencer 1:f5ac63519541 1097 if (p != NULL) {
Michael J. Spencer 1:f5ac63519541 1098 tcp_recved(pcb, p->tot_len);
Michael J. Spencer 1:f5ac63519541 1099 pbuf_free(p);
Michael J. Spencer 1:f5ac63519541 1100 } else if (err == ERR_OK) {
Michael J. Spencer 1:f5ac63519541 1101 return tcp_close(pcb);
Michael J. Spencer 1:f5ac63519541 1102 }
Michael J. Spencer 1:f5ac63519541 1103 return ERR_OK;
Michael J. Spencer 1:f5ac63519541 1104 }
Michael J. Spencer 1:f5ac63519541 1105 #endif /* LWIP_CALLBACK_API */
Michael J. Spencer 1:f5ac63519541 1106
Michael J. Spencer 1:f5ac63519541 1107 /**
Michael J. Spencer 1:f5ac63519541 1108 * Kills the oldest active connection that has lower priority than prio.
Michael J. Spencer 1:f5ac63519541 1109 *
Michael J. Spencer 1:f5ac63519541 1110 * @param prio minimum priority
Michael J. Spencer 1:f5ac63519541 1111 */
Michael J. Spencer 1:f5ac63519541 1112 static void
Michael J. Spencer 1:f5ac63519541 1113 tcp_kill_prio(u8_t prio)
Michael J. Spencer 1:f5ac63519541 1114 {
Michael J. Spencer 1:f5ac63519541 1115 struct tcp_pcb *pcb, *inactive;
Michael J. Spencer 1:f5ac63519541 1116 u32_t inactivity;
Michael J. Spencer 1:f5ac63519541 1117 u8_t mprio;
Michael J. Spencer 1:f5ac63519541 1118
Michael J. Spencer 1:f5ac63519541 1119
Michael J. Spencer 1:f5ac63519541 1120 mprio = TCP_PRIO_MAX;
Michael J. Spencer 1:f5ac63519541 1121
Michael J. Spencer 1:f5ac63519541 1122 /* We kill the oldest active connection that has lower priority than prio. */
Michael J. Spencer 1:f5ac63519541 1123 inactivity = 0;
Michael J. Spencer 1:f5ac63519541 1124 inactive = NULL;
Michael J. Spencer 1:f5ac63519541 1125 for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
Michael J. Spencer 1:f5ac63519541 1126 if (pcb->prio <= prio &&
Michael J. Spencer 1:f5ac63519541 1127 pcb->prio <= mprio &&
Michael J. Spencer 1:f5ac63519541 1128 (u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
Michael J. Spencer 1:f5ac63519541 1129 inactivity = tcp_ticks - pcb->tmr;
Michael J. Spencer 1:f5ac63519541 1130 inactive = pcb;
Michael J. Spencer 1:f5ac63519541 1131 mprio = pcb->prio;
Michael J. Spencer 1:f5ac63519541 1132 }
Michael J. Spencer 1:f5ac63519541 1133 }
Michael J. Spencer 1:f5ac63519541 1134 if (inactive != NULL) {
Michael J. Spencer 1:f5ac63519541 1135 LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n",
Michael J. Spencer 1:f5ac63519541 1136 (void *)inactive, inactivity));
Michael J. Spencer 1:f5ac63519541 1137 tcp_abort(inactive);
Michael J. Spencer 1:f5ac63519541 1138 }
Michael J. Spencer 1:f5ac63519541 1139 }
Michael J. Spencer 1:f5ac63519541 1140
Michael J. Spencer 1:f5ac63519541 1141 /**
Michael J. Spencer 1:f5ac63519541 1142 * Kills the oldest connection that is in TIME_WAIT state.
Michael J. Spencer 1:f5ac63519541 1143 * Called from tcp_alloc() if no more connections are available.
Michael J. Spencer 1:f5ac63519541 1144 */
Michael J. Spencer 1:f5ac63519541 1145 static void
Michael J. Spencer 1:f5ac63519541 1146 tcp_kill_timewait(void)
Michael J. Spencer 1:f5ac63519541 1147 {
Michael J. Spencer 1:f5ac63519541 1148 struct tcp_pcb *pcb, *inactive;
Michael J. Spencer 1:f5ac63519541 1149 u32_t inactivity;
Michael J. Spencer 1:f5ac63519541 1150
Michael J. Spencer 1:f5ac63519541 1151 inactivity = 0;
Michael J. Spencer 1:f5ac63519541 1152 inactive = NULL;
Michael J. Spencer 1:f5ac63519541 1153 /* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
Michael J. Spencer 1:f5ac63519541 1154 for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
Michael J. Spencer 1:f5ac63519541 1155 if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
Michael J. Spencer 1:f5ac63519541 1156 inactivity = tcp_ticks - pcb->tmr;
Michael J. Spencer 1:f5ac63519541 1157 inactive = pcb;
Michael J. Spencer 1:f5ac63519541 1158 }
Michael J. Spencer 1:f5ac63519541 1159 }
Michael J. Spencer 1:f5ac63519541 1160 if (inactive != NULL) {
Michael J. Spencer 1:f5ac63519541 1161 LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n",
Michael J. Spencer 1:f5ac63519541 1162 (void *)inactive, inactivity));
Michael J. Spencer 1:f5ac63519541 1163 tcp_abort(inactive);
Michael J. Spencer 1:f5ac63519541 1164 }
Michael J. Spencer 1:f5ac63519541 1165 }
Michael J. Spencer 1:f5ac63519541 1166
Michael J. Spencer 1:f5ac63519541 1167 /**
Michael J. Spencer 1:f5ac63519541 1168 * Allocate a new tcp_pcb structure.
Michael J. Spencer 1:f5ac63519541 1169 *
Michael J. Spencer 1:f5ac63519541 1170 * @param prio priority for the new pcb
Michael J. Spencer 1:f5ac63519541 1171 * @return a new tcp_pcb that initially is in state CLOSED
Michael J. Spencer 1:f5ac63519541 1172 */
Michael J. Spencer 1:f5ac63519541 1173 struct tcp_pcb *
Michael J. Spencer 1:f5ac63519541 1174 tcp_alloc(u8_t prio)
Michael J. Spencer 1:f5ac63519541 1175 {
Michael J. Spencer 1:f5ac63519541 1176 struct tcp_pcb *pcb;
Michael J. Spencer 1:f5ac63519541 1177 u32_t iss;
Michael J. Spencer 1:f5ac63519541 1178
Michael J. Spencer 1:f5ac63519541 1179 pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
Michael J. Spencer 1:f5ac63519541 1180 if (pcb == NULL) {
Michael J. Spencer 1:f5ac63519541 1181 /* Try killing oldest connection in TIME-WAIT. */
Michael J. Spencer 1:f5ac63519541 1182 LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
Michael J. Spencer 1:f5ac63519541 1183 tcp_kill_timewait();
Michael J. Spencer 1:f5ac63519541 1184 /* Try to allocate a tcp_pcb again. */
Michael J. Spencer 1:f5ac63519541 1185 pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
Michael J. Spencer 1:f5ac63519541 1186 if (pcb == NULL) {
Michael J. Spencer 1:f5ac63519541 1187 /* Try killing active connections with lower priority than the new one. */
Michael J. Spencer 1:f5ac63519541 1188 LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing connection with prio lower than %d\n", prio));
Michael J. Spencer 1:f5ac63519541 1189 tcp_kill_prio(prio);
Michael J. Spencer 1:f5ac63519541 1190 /* Try to allocate a tcp_pcb again. */
Michael J. Spencer 1:f5ac63519541 1191 pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
Michael J. Spencer 1:f5ac63519541 1192 if (pcb != NULL) {
Michael J. Spencer 1:f5ac63519541 1193 /* adjust err stats: memp_malloc failed twice before */
Michael J. Spencer 1:f5ac63519541 1194 MEMP_STATS_DEC(err, MEMP_TCP_PCB);
Michael J. Spencer 1:f5ac63519541 1195 }
Michael J. Spencer 1:f5ac63519541 1196 }
Michael J. Spencer 1:f5ac63519541 1197 if (pcb != NULL) {
Michael J. Spencer 1:f5ac63519541 1198 /* adjust err stats: timewait PCB was freed above */
Michael J. Spencer 1:f5ac63519541 1199 MEMP_STATS_DEC(err, MEMP_TCP_PCB);
Michael J. Spencer 1:f5ac63519541 1200 }
Michael J. Spencer 1:f5ac63519541 1201 }
Michael J. Spencer 1:f5ac63519541 1202 if (pcb != NULL) {
Michael J. Spencer 1:f5ac63519541 1203 memset(pcb, 0, sizeof(struct tcp_pcb));
Michael J. Spencer 1:f5ac63519541 1204 pcb->prio = prio;
Michael J. Spencer 1:f5ac63519541 1205 pcb->snd_buf = TCP_SND_BUF;
Michael J. Spencer 1:f5ac63519541 1206 pcb->snd_queuelen = 0;
Michael J. Spencer 1:f5ac63519541 1207 pcb->rcv_wnd = TCP_WND;
Michael J. Spencer 1:f5ac63519541 1208 pcb->rcv_ann_wnd = TCP_WND;
Michael J. Spencer 1:f5ac63519541 1209 pcb->tos = 0;
Michael J. Spencer 1:f5ac63519541 1210 pcb->ttl = TCP_TTL;
Michael J. Spencer 1:f5ac63519541 1211 /* As initial send MSS, we use TCP_MSS but limit it to 536.
Michael J. Spencer 1:f5ac63519541 1212 The send MSS is updated when an MSS option is received. */
Michael J. Spencer 1:f5ac63519541 1213 pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
Michael J. Spencer 1:f5ac63519541 1214 pcb->rto = 3000 / TCP_SLOW_INTERVAL;
Michael J. Spencer 1:f5ac63519541 1215 pcb->sa = 0;
Michael J. Spencer 1:f5ac63519541 1216 pcb->sv = 3000 / TCP_SLOW_INTERVAL;
Michael J. Spencer 1:f5ac63519541 1217 pcb->rtime = -1;
Michael J. Spencer 1:f5ac63519541 1218 pcb->cwnd = 1;
Michael J. Spencer 1:f5ac63519541 1219 iss = tcp_next_iss();
Michael J. Spencer 1:f5ac63519541 1220 pcb->snd_wl2 = iss;
Michael J. Spencer 1:f5ac63519541 1221 pcb->snd_nxt = iss;
Michael J. Spencer 1:f5ac63519541 1222 pcb->lastack = iss;
Michael J. Spencer 1:f5ac63519541 1223 pcb->snd_lbb = iss;
Michael J. Spencer 1:f5ac63519541 1224 pcb->tmr = tcp_ticks;
Michael J. Spencer 1:f5ac63519541 1225
Michael J. Spencer 1:f5ac63519541 1226 LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
Michael J. Spencer 1:f5ac63519541 1227
Michael J. Spencer 1:f5ac63519541 1228 pcb->polltmr = 0;
Michael J. Spencer 1:f5ac63519541 1229
Michael J. Spencer 1:f5ac63519541 1230 #if LWIP_CALLBACK_API
Michael J. Spencer 1:f5ac63519541 1231 pcb->recv = tcp_recv_null;
Michael J. Spencer 1:f5ac63519541 1232 #endif /* LWIP_CALLBACK_API */
Michael J. Spencer 1:f5ac63519541 1233
Michael J. Spencer 1:f5ac63519541 1234 /* Init KEEPALIVE timer */
Michael J. Spencer 1:f5ac63519541 1235 pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
Michael J. Spencer 1:f5ac63519541 1236
Michael J. Spencer 1:f5ac63519541 1237 #if LWIP_TCP_KEEPALIVE
Michael J. Spencer 1:f5ac63519541 1238 pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
Michael J. Spencer 1:f5ac63519541 1239 pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
Michael J. Spencer 1:f5ac63519541 1240 #endif /* LWIP_TCP_KEEPALIVE */
Michael J. Spencer 1:f5ac63519541 1241
Michael J. Spencer 1:f5ac63519541 1242 pcb->keep_cnt_sent = 0;
Michael J. Spencer 1:f5ac63519541 1243 }
Michael J. Spencer 1:f5ac63519541 1244 return pcb;
Michael J. Spencer 1:f5ac63519541 1245 }
Michael J. Spencer 1:f5ac63519541 1246
Michael J. Spencer 1:f5ac63519541 1247 /**
Michael J. Spencer 1:f5ac63519541 1248 * Creates a new TCP protocol control block but doesn't place it on
Michael J. Spencer 1:f5ac63519541 1249 * any of the TCP PCB lists.
Michael J. Spencer 1:f5ac63519541 1250 * The pcb is not put on any list until binding using tcp_bind().
Michael J. Spencer 1:f5ac63519541 1251 *
Michael J. Spencer 1:f5ac63519541 1252 * @internal: Maybe there should be a idle TCP PCB list where these
Michael J. Spencer 1:f5ac63519541 1253 * PCBs are put on. Port reservation using tcp_bind() is implemented but
Michael J. Spencer 1:f5ac63519541 1254 * allocated pcbs that are not bound can't be killed automatically if wanting
Michael J. Spencer 1:f5ac63519541 1255 * to allocate a pcb with higher prio (@see tcp_kill_prio())
Michael J. Spencer 1:f5ac63519541 1256 *
Michael J. Spencer 1:f5ac63519541 1257 * @return a new tcp_pcb that initially is in state CLOSED
Michael J. Spencer 1:f5ac63519541 1258 */
Michael J. Spencer 1:f5ac63519541 1259 struct tcp_pcb *
Michael J. Spencer 1:f5ac63519541 1260 tcp_new(void)
Michael J. Spencer 1:f5ac63519541 1261 {
Michael J. Spencer 1:f5ac63519541 1262 return tcp_alloc(TCP_PRIO_NORMAL);
Michael J. Spencer 1:f5ac63519541 1263 }
Michael J. Spencer 1:f5ac63519541 1264
Michael J. Spencer 1:f5ac63519541 1265 /**
Michael J. Spencer 1:f5ac63519541 1266 * Used to specify the argument that should be passed callback
Michael J. Spencer 1:f5ac63519541 1267 * functions.
Michael J. Spencer 1:f5ac63519541 1268 *
Michael J. Spencer 1:f5ac63519541 1269 * @param pcb tcp_pcb to set the callback argument
Michael J. Spencer 1:f5ac63519541 1270 * @param arg void pointer argument to pass to callback functions
Michael J. Spencer 1:f5ac63519541 1271 */
Michael J. Spencer 1:f5ac63519541 1272 void
Michael J. Spencer 1:f5ac63519541 1273 tcp_arg(struct tcp_pcb *pcb, void *arg)
Michael J. Spencer 1:f5ac63519541 1274 {
Michael J. Spencer 1:f5ac63519541 1275 pcb->callback_arg = arg;
Michael J. Spencer 1:f5ac63519541 1276 }
Michael J. Spencer 1:f5ac63519541 1277 #if LWIP_CALLBACK_API
Michael J. Spencer 1:f5ac63519541 1278
Michael J. Spencer 1:f5ac63519541 1279 /**
Michael J. Spencer 1:f5ac63519541 1280 * Used to specify the function that should be called when a TCP
Michael J. Spencer 1:f5ac63519541 1281 * connection receives data.
Michael J. Spencer 1:f5ac63519541 1282 *
Michael J. Spencer 1:f5ac63519541 1283 * @param pcb tcp_pcb to set the recv callback
Michael J. Spencer 1:f5ac63519541 1284 * @param recv callback function to call for this pcb when data is received
Michael J. Spencer 1:f5ac63519541 1285 */
Michael J. Spencer 1:f5ac63519541 1286 void
Michael J. Spencer 1:f5ac63519541 1287 tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
Michael J. Spencer 1:f5ac63519541 1288 {
Michael J. Spencer 1:f5ac63519541 1289 pcb->recv = recv;
Michael J. Spencer 1:f5ac63519541 1290 }
Michael J. Spencer 1:f5ac63519541 1291
Michael J. Spencer 1:f5ac63519541 1292 /**
Michael J. Spencer 1:f5ac63519541 1293 * Used to specify the function that should be called when TCP data
Michael J. Spencer 1:f5ac63519541 1294 * has been successfully delivered to the remote host.
Michael J. Spencer 1:f5ac63519541 1295 *
Michael J. Spencer 1:f5ac63519541 1296 * @param pcb tcp_pcb to set the sent callback
Michael J. Spencer 1:f5ac63519541 1297 * @param sent callback function to call for this pcb when data is successfully sent
Michael J. Spencer 1:f5ac63519541 1298 */
Michael J. Spencer 1:f5ac63519541 1299 void
Michael J. Spencer 1:f5ac63519541 1300 tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
Michael J. Spencer 1:f5ac63519541 1301 {
Michael J. Spencer 1:f5ac63519541 1302 pcb->sent = sent;
Michael J. Spencer 1:f5ac63519541 1303 }
Michael J. Spencer 1:f5ac63519541 1304
Michael J. Spencer 1:f5ac63519541 1305 /**
Michael J. Spencer 1:f5ac63519541 1306 * Used to specify the function that should be called when a fatal error
Michael J. Spencer 1:f5ac63519541 1307 * has occured on the connection.
Michael J. Spencer 1:f5ac63519541 1308 *
Michael J. Spencer 1:f5ac63519541 1309 * @param pcb tcp_pcb to set the err callback
Michael J. Spencer 1:f5ac63519541 1310 * @param err callback function to call for this pcb when a fatal error
Michael J. Spencer 1:f5ac63519541 1311 * has occured on the connection
Michael J. Spencer 1:f5ac63519541 1312 */
Michael J. Spencer 1:f5ac63519541 1313 void
Michael J. Spencer 1:f5ac63519541 1314 tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
Michael J. Spencer 1:f5ac63519541 1315 {
Michael J. Spencer 1:f5ac63519541 1316 pcb->errf = err;
Michael J. Spencer 1:f5ac63519541 1317 }
Michael J. Spencer 1:f5ac63519541 1318
Michael J. Spencer 1:f5ac63519541 1319 /**
Michael J. Spencer 1:f5ac63519541 1320 * Used for specifying the function that should be called when a
Michael J. Spencer 1:f5ac63519541 1321 * LISTENing connection has been connected to another host.
Michael J. Spencer 1:f5ac63519541 1322 *
Michael J. Spencer 1:f5ac63519541 1323 * @param pcb tcp_pcb to set the accept callback
Michael J. Spencer 1:f5ac63519541 1324 * @param accept callback function to call for this pcb when LISTENing
Michael J. Spencer 1:f5ac63519541 1325 * connection has been connected to another host
Michael J. Spencer 1:f5ac63519541 1326 */
Michael J. Spencer 1:f5ac63519541 1327 void
Michael J. Spencer 1:f5ac63519541 1328 tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
Michael J. Spencer 1:f5ac63519541 1329 {
Michael J. Spencer 1:f5ac63519541 1330 pcb->accept = accept;
Michael J. Spencer 1:f5ac63519541 1331 }
Michael J. Spencer 1:f5ac63519541 1332 #endif /* LWIP_CALLBACK_API */
Michael J. Spencer 1:f5ac63519541 1333
Michael J. Spencer 1:f5ac63519541 1334
Michael J. Spencer 1:f5ac63519541 1335 /**
Michael J. Spencer 1:f5ac63519541 1336 * Used to specify the function that should be called periodically
Michael J. Spencer 1:f5ac63519541 1337 * from TCP. The interval is specified in terms of the TCP coarse
Michael J. Spencer 1:f5ac63519541 1338 * timer interval, which is called twice a second.
Michael J. Spencer 1:f5ac63519541 1339 *
Michael J. Spencer 1:f5ac63519541 1340 */
Michael J. Spencer 1:f5ac63519541 1341 void
Michael J. Spencer 1:f5ac63519541 1342 tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
Michael J. Spencer 1:f5ac63519541 1343 {
Michael J. Spencer 1:f5ac63519541 1344 #if LWIP_CALLBACK_API
Michael J. Spencer 1:f5ac63519541 1345 pcb->poll = poll;
Michael J. Spencer 1:f5ac63519541 1346 #else /* LWIP_CALLBACK_API */
Michael J. Spencer 1:f5ac63519541 1347 LWIP_UNUSED_ARG(poll);
Michael J. Spencer 1:f5ac63519541 1348 #endif /* LWIP_CALLBACK_API */
Michael J. Spencer 1:f5ac63519541 1349 pcb->pollinterval = interval;
Michael J. Spencer 1:f5ac63519541 1350 }
Michael J. Spencer 1:f5ac63519541 1351
Michael J. Spencer 1:f5ac63519541 1352 /**
Michael J. Spencer 1:f5ac63519541 1353 * Purges a TCP PCB. Removes any buffered data and frees the buffer memory
Michael J. Spencer 1:f5ac63519541 1354 * (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
Michael J. Spencer 1:f5ac63519541 1355 *
Michael J. Spencer 1:f5ac63519541 1356 * @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
Michael J. Spencer 1:f5ac63519541 1357 */
Michael J. Spencer 1:f5ac63519541 1358 void
Michael J. Spencer 1:f5ac63519541 1359 tcp_pcb_purge(struct tcp_pcb *pcb)
Michael J. Spencer 1:f5ac63519541 1360 {
Michael J. Spencer 1:f5ac63519541 1361 if (pcb->state != CLOSED &&
Michael J. Spencer 1:f5ac63519541 1362 pcb->state != TIME_WAIT &&
Michael J. Spencer 1:f5ac63519541 1363 pcb->state != LISTEN) {
Michael J. Spencer 1:f5ac63519541 1364
Michael J. Spencer 1:f5ac63519541 1365 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
Michael J. Spencer 1:f5ac63519541 1366
Michael J. Spencer 1:f5ac63519541 1367 #if TCP_LISTEN_BACKLOG
Michael J. Spencer 1:f5ac63519541 1368 if (pcb->state == SYN_RCVD) {
Michael J. Spencer 1:f5ac63519541 1369 /* Need to find the corresponding listen_pcb and decrease its accepts_pending */
Michael J. Spencer 1:f5ac63519541 1370 struct tcp_pcb_listen *lpcb;
Michael J. Spencer 1:f5ac63519541 1371 LWIP_ASSERT("tcp_pcb_purge: pcb->state == SYN_RCVD but tcp_listen_pcbs is NULL",
Michael J. Spencer 1:f5ac63519541 1372 tcp_listen_pcbs.listen_pcbs != NULL);
Michael J. Spencer 1:f5ac63519541 1373 for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
Michael J. Spencer 1:f5ac63519541 1374 if ((lpcb->local_port == pcb->local_port) &&
Michael J. Spencer 1:f5ac63519541 1375 (ip_addr_isany(&lpcb->local_ip) ||
Michael J. Spencer 1:f5ac63519541 1376 ip_addr_cmp(&pcb->local_ip, &lpcb->local_ip))) {
Michael J. Spencer 1:f5ac63519541 1377 /* port and address of the listen pcb match the timed-out pcb */
Michael J. Spencer 1:f5ac63519541 1378 LWIP_ASSERT("tcp_pcb_purge: listen pcb does not have accepts pending",
Michael J. Spencer 1:f5ac63519541 1379 lpcb->accepts_pending > 0);
Michael J. Spencer 1:f5ac63519541 1380 lpcb->accepts_pending--;
Michael J. Spencer 1:f5ac63519541 1381 break;
Michael J. Spencer 1:f5ac63519541 1382 }
Michael J. Spencer 1:f5ac63519541 1383 }
Michael J. Spencer 1:f5ac63519541 1384 }
Michael J. Spencer 1:f5ac63519541 1385 #endif /* TCP_LISTEN_BACKLOG */
Michael J. Spencer 1:f5ac63519541 1386
Michael J. Spencer 1:f5ac63519541 1387
Michael J. Spencer 1:f5ac63519541 1388 if (pcb->refused_data != NULL) {
Michael J. Spencer 1:f5ac63519541 1389 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
Michael J. Spencer 1:f5ac63519541 1390 pbuf_free(pcb->refused_data);
Michael J. Spencer 1:f5ac63519541 1391 pcb->refused_data = NULL;
Michael J. Spencer 1:f5ac63519541 1392 }
Michael J. Spencer 1:f5ac63519541 1393 if (pcb->unsent != NULL) {
Michael J. Spencer 1:f5ac63519541 1394 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
Michael J. Spencer 1:f5ac63519541 1395 }
Michael J. Spencer 1:f5ac63519541 1396 if (pcb->unacked != NULL) {
Michael J. Spencer 1:f5ac63519541 1397 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
Michael J. Spencer 1:f5ac63519541 1398 }
Michael J. Spencer 1:f5ac63519541 1399 #if TCP_QUEUE_OOSEQ
Michael J. Spencer 1:f5ac63519541 1400 if (pcb->ooseq != NULL) {
Michael J. Spencer 1:f5ac63519541 1401 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
Michael J. Spencer 1:f5ac63519541 1402 }
Michael J. Spencer 1:f5ac63519541 1403 tcp_segs_free(pcb->ooseq);
Michael J. Spencer 1:f5ac63519541 1404 pcb->ooseq = NULL;
Michael J. Spencer 1:f5ac63519541 1405 #endif /* TCP_QUEUE_OOSEQ */
Michael J. Spencer 1:f5ac63519541 1406
Michael J. Spencer 1:f5ac63519541 1407 /* Stop the retransmission timer as it will expect data on unacked
Michael J. Spencer 1:f5ac63519541 1408 queue if it fires */
Michael J. Spencer 1:f5ac63519541 1409 pcb->rtime = -1;
Michael J. Spencer 1:f5ac63519541 1410
Michael J. Spencer 1:f5ac63519541 1411 tcp_segs_free(pcb->unsent);
Michael J. Spencer 1:f5ac63519541 1412 tcp_segs_free(pcb->unacked);
Michael J. Spencer 1:f5ac63519541 1413 pcb->unacked = pcb->unsent = NULL;
Michael J. Spencer 1:f5ac63519541 1414 #if TCP_OVERSIZE
Michael J. Spencer 1:f5ac63519541 1415 pcb->unsent_oversize = 0;
Michael J. Spencer 1:f5ac63519541 1416 #endif /* TCP_OVERSIZE */
Michael J. Spencer 1:f5ac63519541 1417 }
Michael J. Spencer 1:f5ac63519541 1418 }
Michael J. Spencer 1:f5ac63519541 1419
Michael J. Spencer 1:f5ac63519541 1420 /**
Michael J. Spencer 1:f5ac63519541 1421 * Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
Michael J. Spencer 1:f5ac63519541 1422 *
Michael J. Spencer 1:f5ac63519541 1423 * @param pcblist PCB list to purge.
Michael J. Spencer 1:f5ac63519541 1424 * @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
Michael J. Spencer 1:f5ac63519541 1425 */
Michael J. Spencer 1:f5ac63519541 1426 void
Michael J. Spencer 1:f5ac63519541 1427 tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb)
Michael J. Spencer 1:f5ac63519541 1428 {
Michael J. Spencer 1:f5ac63519541 1429 TCP_RMV(pcblist, pcb);
Michael J. Spencer 1:f5ac63519541 1430
Michael J. Spencer 1:f5ac63519541 1431 tcp_pcb_purge(pcb);
Michael J. Spencer 1:f5ac63519541 1432
Michael J. Spencer 1:f5ac63519541 1433 /* if there is an outstanding delayed ACKs, send it */
Michael J. Spencer 1:f5ac63519541 1434 if (pcb->state != TIME_WAIT &&
Michael J. Spencer 1:f5ac63519541 1435 pcb->state != LISTEN &&
Michael J. Spencer 1:f5ac63519541 1436 pcb->flags & TF_ACK_DELAY) {
Michael J. Spencer 1:f5ac63519541 1437 pcb->flags |= TF_ACK_NOW;
Michael J. Spencer 1:f5ac63519541 1438 tcp_output(pcb);
Michael J. Spencer 1:f5ac63519541 1439 }
Michael J. Spencer 1:f5ac63519541 1440
Michael J. Spencer 1:f5ac63519541 1441 if (pcb->state != LISTEN) {
Michael J. Spencer 1:f5ac63519541 1442 LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
Michael J. Spencer 1:f5ac63519541 1443 LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
Michael J. Spencer 1:f5ac63519541 1444 #if TCP_QUEUE_OOSEQ
Michael J. Spencer 1:f5ac63519541 1445 LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
Michael J. Spencer 1:f5ac63519541 1446 #endif /* TCP_QUEUE_OOSEQ */
Michael J. Spencer 1:f5ac63519541 1447 }
Michael J. Spencer 1:f5ac63519541 1448
Michael J. Spencer 1:f5ac63519541 1449 pcb->state = CLOSED;
Michael J. Spencer 1:f5ac63519541 1450
Michael J. Spencer 1:f5ac63519541 1451 LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
Michael J. Spencer 1:f5ac63519541 1452 }
Michael J. Spencer 1:f5ac63519541 1453
Michael J. Spencer 1:f5ac63519541 1454 /**
Michael J. Spencer 1:f5ac63519541 1455 * Calculates a new initial sequence number for new connections.
Michael J. Spencer 1:f5ac63519541 1456 *
Michael J. Spencer 1:f5ac63519541 1457 * @return u32_t pseudo random sequence number
Michael J. Spencer 1:f5ac63519541 1458 */
Michael J. Spencer 1:f5ac63519541 1459 u32_t
Michael J. Spencer 1:f5ac63519541 1460 tcp_next_iss(void)
Michael J. Spencer 1:f5ac63519541 1461 {
Michael J. Spencer 1:f5ac63519541 1462 static u32_t iss = 6510;
Michael J. Spencer 1:f5ac63519541 1463
Michael J. Spencer 1:f5ac63519541 1464 iss += tcp_ticks; /* XXX */
Michael J. Spencer 1:f5ac63519541 1465 return iss;
Michael J. Spencer 1:f5ac63519541 1466 }
Michael J. Spencer 1:f5ac63519541 1467
Michael J. Spencer 1:f5ac63519541 1468 #if TCP_CALCULATE_EFF_SEND_MSS
Michael J. Spencer 1:f5ac63519541 1469 /**
Michael J. Spencer 1:f5ac63519541 1470 * Calcluates the effective send mss that can be used for a specific IP address
Michael J. Spencer 1:f5ac63519541 1471 * by using ip_route to determin the netif used to send to the address and
Michael J. Spencer 1:f5ac63519541 1472 * calculating the minimum of TCP_MSS and that netif's mtu (if set).
Michael J. Spencer 1:f5ac63519541 1473 */
Michael J. Spencer 1:f5ac63519541 1474 u16_t
Michael J. Spencer 1:f5ac63519541 1475 tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr)
Michael J. Spencer 1:f5ac63519541 1476 {
Michael J. Spencer 1:f5ac63519541 1477 u16_t mss_s;
Michael J. Spencer 1:f5ac63519541 1478 struct netif *outif;
Michael J. Spencer 1:f5ac63519541 1479
Michael J. Spencer 1:f5ac63519541 1480 outif = ip_route(addr);
Michael J. Spencer 1:f5ac63519541 1481 if ((outif != NULL) && (outif->mtu != 0)) {
Michael J. Spencer 1:f5ac63519541 1482 mss_s = outif->mtu - IP_HLEN - TCP_HLEN;
Michael J. Spencer 1:f5ac63519541 1483 /* RFC 1122, chap 4.2.2.6:
Michael J. Spencer 1:f5ac63519541 1484 * Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
Michael J. Spencer 1:f5ac63519541 1485 * We correct for TCP options in tcp_write(), and don't support IP options.
Michael J. Spencer 1:f5ac63519541 1486 */
Michael J. Spencer 1:f5ac63519541 1487 sendmss = LWIP_MIN(sendmss, mss_s);
Michael J. Spencer 1:f5ac63519541 1488 }
Michael J. Spencer 1:f5ac63519541 1489 return sendmss;
Michael J. Spencer 1:f5ac63519541 1490 }
Michael J. Spencer 1:f5ac63519541 1491 #endif /* TCP_CALCULATE_EFF_SEND_MSS */
Michael J. Spencer 1:f5ac63519541 1492
Michael J. Spencer 1:f5ac63519541 1493 const char*
Michael J. Spencer 1:f5ac63519541 1494 tcp_debug_state_str(enum tcp_state s)
Michael J. Spencer 1:f5ac63519541 1495 {
Michael J. Spencer 1:f5ac63519541 1496 return tcp_state_str[s];
Michael J. Spencer 1:f5ac63519541 1497 }
Michael J. Spencer 1:f5ac63519541 1498
Michael J. Spencer 1:f5ac63519541 1499 #if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
Michael J. Spencer 1:f5ac63519541 1500 /**
Michael J. Spencer 1:f5ac63519541 1501 * Print a tcp header for debugging purposes.
Michael J. Spencer 1:f5ac63519541 1502 *
Michael J. Spencer 1:f5ac63519541 1503 * @param tcphdr pointer to a struct tcp_hdr
Michael J. Spencer 1:f5ac63519541 1504 */
Michael J. Spencer 1:f5ac63519541 1505 void
Michael J. Spencer 1:f5ac63519541 1506 tcp_debug_print(struct tcp_hdr *tcphdr)
Michael J. Spencer 1:f5ac63519541 1507 {
Michael J. Spencer 1:f5ac63519541 1508 LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
Michael J. Spencer 1:f5ac63519541 1509 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
Michael J. Spencer 1:f5ac63519541 1510 LWIP_DEBUGF(TCP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
Michael J. Spencer 1:f5ac63519541 1511 ntohs(tcphdr->src), ntohs(tcphdr->dest)));
Michael J. Spencer 1:f5ac63519541 1512 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
Michael J. Spencer 1:f5ac63519541 1513 LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (seq no)\n",
Michael J. Spencer 1:f5ac63519541 1514 ntohl(tcphdr->seqno)));
Michael J. Spencer 1:f5ac63519541 1515 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
Michael J. Spencer 1:f5ac63519541 1516 LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (ack no)\n",
Michael J. Spencer 1:f5ac63519541 1517 ntohl(tcphdr->ackno)));
Michael J. Spencer 1:f5ac63519541 1518 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
Michael J. Spencer 1:f5ac63519541 1519 LWIP_DEBUGF(TCP_DEBUG, ("| %2"U16_F" | |%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"| %5"U16_F" | (hdrlen, flags (",
Michael J. Spencer 1:f5ac63519541 1520 TCPH_HDRLEN(tcphdr),
Michael J. Spencer 1:f5ac63519541 1521 TCPH_FLAGS(tcphdr) >> 5 & 1,
Michael J. Spencer 1:f5ac63519541 1522 TCPH_FLAGS(tcphdr) >> 4 & 1,
Michael J. Spencer 1:f5ac63519541 1523 TCPH_FLAGS(tcphdr) >> 3 & 1,
Michael J. Spencer 1:f5ac63519541 1524 TCPH_FLAGS(tcphdr) >> 2 & 1,
Michael J. Spencer 1:f5ac63519541 1525 TCPH_FLAGS(tcphdr) >> 1 & 1,
Michael J. Spencer 1:f5ac63519541 1526 TCPH_FLAGS(tcphdr) & 1,
Michael J. Spencer 1:f5ac63519541 1527 ntohs(tcphdr->wnd)));
Michael J. Spencer 1:f5ac63519541 1528 tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
Michael J. Spencer 1:f5ac63519541 1529 LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
Michael J. Spencer 1:f5ac63519541 1530 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
Michael J. Spencer 1:f5ac63519541 1531 LWIP_DEBUGF(TCP_DEBUG, ("| 0x%04"X16_F" | %5"U16_F" | (chksum, urgp)\n",
Michael J. Spencer 1:f5ac63519541 1532 ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
Michael J. Spencer 1:f5ac63519541 1533 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
Michael J. Spencer 1:f5ac63519541 1534 }
Michael J. Spencer 1:f5ac63519541 1535
Michael J. Spencer 1:f5ac63519541 1536 /**
Michael J. Spencer 1:f5ac63519541 1537 * Print a tcp state for debugging purposes.
Michael J. Spencer 1:f5ac63519541 1538 *
Michael J. Spencer 1:f5ac63519541 1539 * @param s enum tcp_state to print
Michael J. Spencer 1:f5ac63519541 1540 */
Michael J. Spencer 1:f5ac63519541 1541 void
Michael J. Spencer 1:f5ac63519541 1542 tcp_debug_print_state(enum tcp_state s)
Michael J. Spencer 1:f5ac63519541 1543 {
Michael J. Spencer 1:f5ac63519541 1544 LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
Michael J. Spencer 1:f5ac63519541 1545 }
Michael J. Spencer 1:f5ac63519541 1546
Michael J. Spencer 1:f5ac63519541 1547 /**
Michael J. Spencer 1:f5ac63519541 1548 * Print tcp flags for debugging purposes.
Michael J. Spencer 1:f5ac63519541 1549 *
Michael J. Spencer 1:f5ac63519541 1550 * @param flags tcp flags, all active flags are printed
Michael J. Spencer 1:f5ac63519541 1551 */
Michael J. Spencer 1:f5ac63519541 1552 void
Michael J. Spencer 1:f5ac63519541 1553 tcp_debug_print_flags(u8_t flags)
Michael J. Spencer 1:f5ac63519541 1554 {
Michael J. Spencer 1:f5ac63519541 1555 if (flags & TCP_FIN) {
Michael J. Spencer 1:f5ac63519541 1556 LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
Michael J. Spencer 1:f5ac63519541 1557 }
Michael J. Spencer 1:f5ac63519541 1558 if (flags & TCP_SYN) {
Michael J. Spencer 1:f5ac63519541 1559 LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
Michael J. Spencer 1:f5ac63519541 1560 }
Michael J. Spencer 1:f5ac63519541 1561 if (flags & TCP_RST) {
Michael J. Spencer 1:f5ac63519541 1562 LWIP_DEBUGF(TCP_DEBUG, ("RST "));
Michael J. Spencer 1:f5ac63519541 1563 }
Michael J. Spencer 1:f5ac63519541 1564 if (flags & TCP_PSH) {
Michael J. Spencer 1:f5ac63519541 1565 LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
Michael J. Spencer 1:f5ac63519541 1566 }
Michael J. Spencer 1:f5ac63519541 1567 if (flags & TCP_ACK) {
Michael J. Spencer 1:f5ac63519541 1568 LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
Michael J. Spencer 1:f5ac63519541 1569 }
Michael J. Spencer 1:f5ac63519541 1570 if (flags & TCP_URG) {
Michael J. Spencer 1:f5ac63519541 1571 LWIP_DEBUGF(TCP_DEBUG, ("URG "));
Michael J. Spencer 1:f5ac63519541 1572 }
Michael J. Spencer 1:f5ac63519541 1573 if (flags & TCP_ECE) {
Michael J. Spencer 1:f5ac63519541 1574 LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
Michael J. Spencer 1:f5ac63519541 1575 }
Michael J. Spencer 1:f5ac63519541 1576 if (flags & TCP_CWR) {
Michael J. Spencer 1:f5ac63519541 1577 LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
Michael J. Spencer 1:f5ac63519541 1578 }
Michael J. Spencer 1:f5ac63519541 1579 LWIP_DEBUGF(TCP_DEBUG, ("\n"));
Michael J. Spencer 1:f5ac63519541 1580 }
Michael J. Spencer 1:f5ac63519541 1581
Michael J. Spencer 1:f5ac63519541 1582 /**
Michael J. Spencer 1:f5ac63519541 1583 * Print all tcp_pcbs in every list for debugging purposes.
Michael J. Spencer 1:f5ac63519541 1584 */
Michael J. Spencer 1:f5ac63519541 1585 void
Michael J. Spencer 1:f5ac63519541 1586 tcp_debug_print_pcbs(void)
Michael J. Spencer 1:f5ac63519541 1587 {
Michael J. Spencer 1:f5ac63519541 1588 struct tcp_pcb *pcb;
Michael J. Spencer 1:f5ac63519541 1589 LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
Michael J. Spencer 1:f5ac63519541 1590 for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
Michael J. Spencer 1:f5ac63519541 1591 LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
Michael J. Spencer 1:f5ac63519541 1592 pcb->local_port, pcb->remote_port,
Michael J. Spencer 1:f5ac63519541 1593 pcb->snd_nxt, pcb->rcv_nxt));
Michael J. Spencer 1:f5ac63519541 1594 tcp_debug_print_state(pcb->state);
Michael J. Spencer 1:f5ac63519541 1595 }
Michael J. Spencer 1:f5ac63519541 1596 LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
Michael J. Spencer 1:f5ac63519541 1597 for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
Michael J. Spencer 1:f5ac63519541 1598 LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
Michael J. Spencer 1:f5ac63519541 1599 pcb->local_port, pcb->remote_port,
Michael J. Spencer 1:f5ac63519541 1600 pcb->snd_nxt, pcb->rcv_nxt));
Michael J. Spencer 1:f5ac63519541 1601 tcp_debug_print_state(pcb->state);
Michael J. Spencer 1:f5ac63519541 1602 }
Michael J. Spencer 1:f5ac63519541 1603 LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
Michael J. Spencer 1:f5ac63519541 1604 for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
Michael J. Spencer 1:f5ac63519541 1605 LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
Michael J. Spencer 1:f5ac63519541 1606 pcb->local_port, pcb->remote_port,
Michael J. Spencer 1:f5ac63519541 1607 pcb->snd_nxt, pcb->rcv_nxt));
Michael J. Spencer 1:f5ac63519541 1608 tcp_debug_print_state(pcb->state);
Michael J. Spencer 1:f5ac63519541 1609 }
Michael J. Spencer 1:f5ac63519541 1610 }
Michael J. Spencer 1:f5ac63519541 1611
Michael J. Spencer 1:f5ac63519541 1612 /**
Michael J. Spencer 1:f5ac63519541 1613 * Check state consistency of the tcp_pcb lists.
Michael J. Spencer 1:f5ac63519541 1614 */
Michael J. Spencer 1:f5ac63519541 1615 s16_t
Michael J. Spencer 1:f5ac63519541 1616 tcp_pcbs_sane(void)
Michael J. Spencer 1:f5ac63519541 1617 {
Michael J. Spencer 1:f5ac63519541 1618 struct tcp_pcb *pcb;
Michael J. Spencer 1:f5ac63519541 1619 for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
Michael J. Spencer 1:f5ac63519541 1620 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
Michael J. Spencer 1:f5ac63519541 1621 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
Michael J. Spencer 1:f5ac63519541 1622 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
Michael J. Spencer 1:f5ac63519541 1623 }
Michael J. Spencer 1:f5ac63519541 1624 for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
Michael J. Spencer 1:f5ac63519541 1625 LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
Michael J. Spencer 1:f5ac63519541 1626 }
Michael J. Spencer 1:f5ac63519541 1627 return 1;
Michael J. Spencer 1:f5ac63519541 1628 }
Michael J. Spencer 1:f5ac63519541 1629 #endif /* TCP_DEBUG */
Michael J. Spencer 1:f5ac63519541 1630
Michael J. Spencer 1:f5ac63519541 1631 #endif /* LWIP_TCP */