Michael Kersh / Mbed 2 deprecated ECE4180EthernetTest

Ethernet test for ECE 4180 and others to find your IP address and do a simple HTTP GET request over port 80.

Dependencies:   mbed Socket lwip-eth lwip-sys lwip

EthernetInterface/lwip/core/tcp.c@0:e7ca326e76ee, 2013-04-04 (annotated)

Committer:
mkersh3
Date:
Thu Apr 04 05:26:09 2013 +0000
Revision:
0:e7ca326e76ee
Ethernet Test for ECE4180 and others to find their IP Address and do a simple HTTP GET request over port 80.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mkersh3 0:e7ca326e76ee 1 /**
mkersh3 0:e7ca326e76ee 2 * @file
mkersh3 0:e7ca326e76ee 3 * Transmission Control Protocol for IP
mkersh3 0:e7ca326e76ee 4 *
mkersh3 0:e7ca326e76ee 5 * This file contains common functions for the TCP implementation, such as functinos
mkersh3 0:e7ca326e76ee 6 * for manipulating the data structures and the TCP timer functions. TCP functions
mkersh3 0:e7ca326e76ee 7 * related to input and output is found in tcp_in.c and tcp_out.c respectively.
mkersh3 0:e7ca326e76ee 8 *
mkersh3 0:e7ca326e76ee 9 */
mkersh3 0:e7ca326e76ee 10
mkersh3 0:e7ca326e76ee 11 /*
mkersh3 0:e7ca326e76ee 12 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
mkersh3 0:e7ca326e76ee 13 * All rights reserved.
mkersh3 0:e7ca326e76ee 14 *
mkersh3 0:e7ca326e76ee 15 * Redistribution and use in source and binary forms, with or without modification,
mkersh3 0:e7ca326e76ee 16 * are permitted provided that the following conditions are met:
mkersh3 0:e7ca326e76ee 17 *
mkersh3 0:e7ca326e76ee 18 * 1. Redistributions of source code must retain the above copyright notice,
mkersh3 0:e7ca326e76ee 19 * this list of conditions and the following disclaimer.
mkersh3 0:e7ca326e76ee 20 * 2. Redistributions in binary form must reproduce the above copyright notice,
mkersh3 0:e7ca326e76ee 21 * this list of conditions and the following disclaimer in the documentation
mkersh3 0:e7ca326e76ee 22 * and/or other materials provided with the distribution.
mkersh3 0:e7ca326e76ee 23 * 3. The name of the author may not be used to endorse or promote products
mkersh3 0:e7ca326e76ee 24 * derived from this software without specific prior written permission.
mkersh3 0:e7ca326e76ee 25 *
mkersh3 0:e7ca326e76ee 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
mkersh3 0:e7ca326e76ee 27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
mkersh3 0:e7ca326e76ee 28 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
mkersh3 0:e7ca326e76ee 29 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
mkersh3 0:e7ca326e76ee 30 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
mkersh3 0:e7ca326e76ee 31 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mkersh3 0:e7ca326e76ee 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mkersh3 0:e7ca326e76ee 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
mkersh3 0:e7ca326e76ee 34 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
mkersh3 0:e7ca326e76ee 35 * OF SUCH DAMAGE.
mkersh3 0:e7ca326e76ee 36 *
mkersh3 0:e7ca326e76ee 37 * This file is part of the lwIP TCP/IP stack.
mkersh3 0:e7ca326e76ee 38 *
mkersh3 0:e7ca326e76ee 39 * Author: Adam Dunkels <adam@sics.se>
mkersh3 0:e7ca326e76ee 40 *
mkersh3 0:e7ca326e76ee 41 */
mkersh3 0:e7ca326e76ee 42
mkersh3 0:e7ca326e76ee 43 #include "lwip/opt.h"
mkersh3 0:e7ca326e76ee 44
mkersh3 0:e7ca326e76ee 45 #if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
mkersh3 0:e7ca326e76ee 46
mkersh3 0:e7ca326e76ee 47 #include "lwip/def.h"
mkersh3 0:e7ca326e76ee 48 #include "lwip/mem.h"
mkersh3 0:e7ca326e76ee 49 #include "lwip/memp.h"
mkersh3 0:e7ca326e76ee 50 #include "lwip/snmp.h"
mkersh3 0:e7ca326e76ee 51 #include "lwip/tcp.h"
mkersh3 0:e7ca326e76ee 52 #include "lwip/tcp_impl.h"
mkersh3 0:e7ca326e76ee 53 #include "lwip/debug.h"
mkersh3 0:e7ca326e76ee 54 #include "lwip/stats.h"
mkersh3 0:e7ca326e76ee 55
mkersh3 0:e7ca326e76ee 56 #include <string.h>
mkersh3 0:e7ca326e76ee 57
mkersh3 0:e7ca326e76ee 58 const char * const tcp_state_str[] = {
mkersh3 0:e7ca326e76ee 59 "CLOSED",
mkersh3 0:e7ca326e76ee 60 "LISTEN",
mkersh3 0:e7ca326e76ee 61 "SYN_SENT",
mkersh3 0:e7ca326e76ee 62 "SYN_RCVD",
mkersh3 0:e7ca326e76ee 63 "ESTABLISHED",
mkersh3 0:e7ca326e76ee 64 "FIN_WAIT_1",
mkersh3 0:e7ca326e76ee 65 "FIN_WAIT_2",
mkersh3 0:e7ca326e76ee 66 "CLOSE_WAIT",
mkersh3 0:e7ca326e76ee 67 "CLOSING",
mkersh3 0:e7ca326e76ee 68 "LAST_ACK",
mkersh3 0:e7ca326e76ee 69 "TIME_WAIT"
mkersh3 0:e7ca326e76ee 70 };
mkersh3 0:e7ca326e76ee 71
mkersh3 0:e7ca326e76ee 72 /* Incremented every coarse grained timer shot (typically every 500 ms). */
mkersh3 0:e7ca326e76ee 73 u32_t tcp_ticks;
mkersh3 0:e7ca326e76ee 74 const u8_t tcp_backoff[13] =
mkersh3 0:e7ca326e76ee 75 { 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
mkersh3 0:e7ca326e76ee 76 /* Times per slowtmr hits */
mkersh3 0:e7ca326e76ee 77 const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
mkersh3 0:e7ca326e76ee 78
mkersh3 0:e7ca326e76ee 79 /* The TCP PCB lists. */
mkersh3 0:e7ca326e76ee 80
mkersh3 0:e7ca326e76ee 81 /** List of all TCP PCBs bound but not yet (connected || listening) */
mkersh3 0:e7ca326e76ee 82 struct tcp_pcb *tcp_bound_pcbs;
mkersh3 0:e7ca326e76ee 83 /** List of all TCP PCBs in LISTEN state */
mkersh3 0:e7ca326e76ee 84 union tcp_listen_pcbs_t tcp_listen_pcbs;
mkersh3 0:e7ca326e76ee 85 /** List of all TCP PCBs that are in a state in which
mkersh3 0:e7ca326e76ee 86 * they accept or send data. */
mkersh3 0:e7ca326e76ee 87 struct tcp_pcb *tcp_active_pcbs;
mkersh3 0:e7ca326e76ee 88 /** List of all TCP PCBs in TIME-WAIT state */
mkersh3 0:e7ca326e76ee 89 struct tcp_pcb *tcp_tw_pcbs;
mkersh3 0:e7ca326e76ee 90
mkersh3 0:e7ca326e76ee 91 #define NUM_TCP_PCB_LISTS 4
mkersh3 0:e7ca326e76ee 92 #define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
mkersh3 0:e7ca326e76ee 93 /** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
mkersh3 0:e7ca326e76ee 94 struct tcp_pcb ** const tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
mkersh3 0:e7ca326e76ee 95 &tcp_active_pcbs, &tcp_tw_pcbs};
mkersh3 0:e7ca326e76ee 96
mkersh3 0:e7ca326e76ee 97 /** Only used for temporary storage. */
mkersh3 0:e7ca326e76ee 98 struct tcp_pcb *tcp_tmp_pcb;
mkersh3 0:e7ca326e76ee 99
mkersh3 0:e7ca326e76ee 100 /** Timer counter to handle calling slow-timer from tcp_tmr() */
mkersh3 0:e7ca326e76ee 101 static u8_t tcp_timer;
mkersh3 0:e7ca326e76ee 102 static u16_t tcp_new_port(void);
mkersh3 0:e7ca326e76ee 103
mkersh3 0:e7ca326e76ee 104 /**
mkersh3 0:e7ca326e76ee 105 * Called periodically to dispatch TCP timers.
mkersh3 0:e7ca326e76ee 106 *
mkersh3 0:e7ca326e76ee 107 */
mkersh3 0:e7ca326e76ee 108 void
mkersh3 0:e7ca326e76ee 109 tcp_tmr(void)
mkersh3 0:e7ca326e76ee 110 {
mkersh3 0:e7ca326e76ee 111 /* Call tcp_fasttmr() every 250 ms */
mkersh3 0:e7ca326e76ee 112 tcp_fasttmr();
mkersh3 0:e7ca326e76ee 113
mkersh3 0:e7ca326e76ee 114 if (++tcp_timer & 1) {
mkersh3 0:e7ca326e76ee 115 /* Call tcp_tmr() every 500 ms, i.e., every other timer
mkersh3 0:e7ca326e76ee 116 tcp_tmr() is called. */
mkersh3 0:e7ca326e76ee 117 tcp_slowtmr();
mkersh3 0:e7ca326e76ee 118 }
mkersh3 0:e7ca326e76ee 119 }
mkersh3 0:e7ca326e76ee 120
mkersh3 0:e7ca326e76ee 121 /**
mkersh3 0:e7ca326e76ee 122 * Closes the TX side of a connection held by the PCB.
mkersh3 0:e7ca326e76ee 123 * For tcp_close(), a RST is sent if the application didn't receive all data
mkersh3 0:e7ca326e76ee 124 * (tcp_recved() not called for all data passed to recv callback).
mkersh3 0:e7ca326e76ee 125 *
mkersh3 0:e7ca326e76ee 126 * Listening pcbs are freed and may not be referenced any more.
mkersh3 0:e7ca326e76ee 127 * Connection pcbs are freed if not yet connected and may not be referenced
mkersh3 0:e7ca326e76ee 128 * any more. If a connection is established (at least SYN received or in
mkersh3 0:e7ca326e76ee 129 * a closing state), the connection is closed, and put in a closing state.
mkersh3 0:e7ca326e76ee 130 * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
mkersh3 0:e7ca326e76ee 131 * unsafe to reference it.
mkersh3 0:e7ca326e76ee 132 *
mkersh3 0:e7ca326e76ee 133 * @param pcb the tcp_pcb to close
mkersh3 0:e7ca326e76ee 134 * @return ERR_OK if connection has been closed
mkersh3 0:e7ca326e76ee 135 * another err_t if closing failed and pcb is not freed
mkersh3 0:e7ca326e76ee 136 */
mkersh3 0:e7ca326e76ee 137 static err_t
mkersh3 0:e7ca326e76ee 138 tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
mkersh3 0:e7ca326e76ee 139 {
mkersh3 0:e7ca326e76ee 140 err_t err;
mkersh3 0:e7ca326e76ee 141
mkersh3 0:e7ca326e76ee 142 if (rst_on_unacked_data && (pcb->state != LISTEN)) {
mkersh3 0:e7ca326e76ee 143 if ((pcb->refused_data != NULL) || (pcb->rcv_wnd != TCP_WND)) {
mkersh3 0:e7ca326e76ee 144 /* Not all data received by application, send RST to tell the remote
mkersh3 0:e7ca326e76ee 145 side about this. */
mkersh3 0:e7ca326e76ee 146 LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
mkersh3 0:e7ca326e76ee 147
mkersh3 0:e7ca326e76ee 148 /* don't call tcp_abort here: we must not deallocate the pcb since
mkersh3 0:e7ca326e76ee 149 that might not be expected when calling tcp_close */
mkersh3 0:e7ca326e76ee 150 tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
mkersh3 0:e7ca326e76ee 151 pcb->local_port, pcb->remote_port);
mkersh3 0:e7ca326e76ee 152
mkersh3 0:e7ca326e76ee 153 tcp_pcb_purge(pcb);
mkersh3 0:e7ca326e76ee 154
mkersh3 0:e7ca326e76ee 155 /* TODO: to which state do we move now? */
mkersh3 0:e7ca326e76ee 156
mkersh3 0:e7ca326e76ee 157 /* move to TIME_WAIT since we close actively */
mkersh3 0:e7ca326e76ee 158 TCP_RMV(&tcp_active_pcbs, pcb);
mkersh3 0:e7ca326e76ee 159 pcb->state = TIME_WAIT;
mkersh3 0:e7ca326e76ee 160 TCP_REG(&tcp_tw_pcbs, pcb);
mkersh3 0:e7ca326e76ee 161
mkersh3 0:e7ca326e76ee 162 return ERR_OK;
mkersh3 0:e7ca326e76ee 163 }
mkersh3 0:e7ca326e76ee 164 }
mkersh3 0:e7ca326e76ee 165
mkersh3 0:e7ca326e76ee 166 switch (pcb->state) {
mkersh3 0:e7ca326e76ee 167 case CLOSED:
mkersh3 0:e7ca326e76ee 168 /* Closing a pcb in the CLOSED state might seem erroneous,
mkersh3 0:e7ca326e76ee 169 * however, it is in this state once allocated and as yet unused
mkersh3 0:e7ca326e76ee 170 * and the user needs some way to free it should the need arise.
mkersh3 0:e7ca326e76ee 171 * Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
mkersh3 0:e7ca326e76ee 172 * or for a pcb that has been used and then entered the CLOSED state
mkersh3 0:e7ca326e76ee 173 * is erroneous, but this should never happen as the pcb has in those cases
mkersh3 0:e7ca326e76ee 174 * been freed, and so any remaining handles are bogus. */
mkersh3 0:e7ca326e76ee 175 err = ERR_OK;
mkersh3 0:e7ca326e76ee 176 if (pcb->local_port != 0) {
mkersh3 0:e7ca326e76ee 177 TCP_RMV(&tcp_bound_pcbs, pcb);
mkersh3 0:e7ca326e76ee 178 }
mkersh3 0:e7ca326e76ee 179 memp_free(MEMP_TCP_PCB, pcb);
mkersh3 0:e7ca326e76ee 180 pcb = NULL;
mkersh3 0:e7ca326e76ee 181 break;
mkersh3 0:e7ca326e76ee 182 case LISTEN:
mkersh3 0:e7ca326e76ee 183 err = ERR_OK;
mkersh3 0:e7ca326e76ee 184 tcp_pcb_remove(&tcp_listen_pcbs.pcbs, pcb);
mkersh3 0:e7ca326e76ee 185 memp_free(MEMP_TCP_PCB_LISTEN, pcb);
mkersh3 0:e7ca326e76ee 186 pcb = NULL;
mkersh3 0:e7ca326e76ee 187 break;
mkersh3 0:e7ca326e76ee 188 case SYN_SENT:
mkersh3 0:e7ca326e76ee 189 err = ERR_OK;
mkersh3 0:e7ca326e76ee 190 tcp_pcb_remove(&tcp_active_pcbs, pcb);
mkersh3 0:e7ca326e76ee 191 memp_free(MEMP_TCP_PCB, pcb);
mkersh3 0:e7ca326e76ee 192 pcb = NULL;
mkersh3 0:e7ca326e76ee 193 snmp_inc_tcpattemptfails();
mkersh3 0:e7ca326e76ee 194 break;
mkersh3 0:e7ca326e76ee 195 case SYN_RCVD:
mkersh3 0:e7ca326e76ee 196 err = tcp_send_fin(pcb);
mkersh3 0:e7ca326e76ee 197 if (err == ERR_OK) {
mkersh3 0:e7ca326e76ee 198 snmp_inc_tcpattemptfails();
mkersh3 0:e7ca326e76ee 199 pcb->state = FIN_WAIT_1;
mkersh3 0:e7ca326e76ee 200 }
mkersh3 0:e7ca326e76ee 201 break;
mkersh3 0:e7ca326e76ee 202 case ESTABLISHED:
mkersh3 0:e7ca326e76ee 203 err = tcp_send_fin(pcb);
mkersh3 0:e7ca326e76ee 204 if (err == ERR_OK) {
mkersh3 0:e7ca326e76ee 205 snmp_inc_tcpestabresets();
mkersh3 0:e7ca326e76ee 206 pcb->state = FIN_WAIT_1;
mkersh3 0:e7ca326e76ee 207 }
mkersh3 0:e7ca326e76ee 208 break;
mkersh3 0:e7ca326e76ee 209 case CLOSE_WAIT:
mkersh3 0:e7ca326e76ee 210 err = tcp_send_fin(pcb);
mkersh3 0:e7ca326e76ee 211 if (err == ERR_OK) {
mkersh3 0:e7ca326e76ee 212 snmp_inc_tcpestabresets();
mkersh3 0:e7ca326e76ee 213 pcb->state = LAST_ACK;
mkersh3 0:e7ca326e76ee 214 }
mkersh3 0:e7ca326e76ee 215 break;
mkersh3 0:e7ca326e76ee 216 default:
mkersh3 0:e7ca326e76ee 217 /* Has already been closed, do nothing. */
mkersh3 0:e7ca326e76ee 218 err = ERR_OK;
mkersh3 0:e7ca326e76ee 219 pcb = NULL;
mkersh3 0:e7ca326e76ee 220 break;
mkersh3 0:e7ca326e76ee 221 }
mkersh3 0:e7ca326e76ee 222
mkersh3 0:e7ca326e76ee 223 if (pcb != NULL && err == ERR_OK) {
mkersh3 0:e7ca326e76ee 224 /* To ensure all data has been sent when tcp_close returns, we have
mkersh3 0:e7ca326e76ee 225 to make sure tcp_output doesn't fail.
mkersh3 0:e7ca326e76ee 226 Since we don't really have to ensure all data has been sent when tcp_close
mkersh3 0:e7ca326e76ee 227 returns (unsent data is sent from tcp timer functions, also), we don't care
mkersh3 0:e7ca326e76ee 228 for the return value of tcp_output for now. */
mkersh3 0:e7ca326e76ee 229 /* @todo: When implementing SO_LINGER, this must be changed somehow:
mkersh3 0:e7ca326e76ee 230 If SOF_LINGER is set, the data should be sent and acked before close returns.
mkersh3 0:e7ca326e76ee 231 This can only be valid for sequential APIs, not for the raw API. */
mkersh3 0:e7ca326e76ee 232 tcp_output(pcb);
mkersh3 0:e7ca326e76ee 233 }
mkersh3 0:e7ca326e76ee 234 return err;
mkersh3 0:e7ca326e76ee 235 }
mkersh3 0:e7ca326e76ee 236
mkersh3 0:e7ca326e76ee 237 /**
mkersh3 0:e7ca326e76ee 238 * Closes the connection held by the PCB.
mkersh3 0:e7ca326e76ee 239 *
mkersh3 0:e7ca326e76ee 240 * Listening pcbs are freed and may not be referenced any more.
mkersh3 0:e7ca326e76ee 241 * Connection pcbs are freed if not yet connected and may not be referenced
mkersh3 0:e7ca326e76ee 242 * any more. If a connection is established (at least SYN received or in
mkersh3 0:e7ca326e76ee 243 * a closing state), the connection is closed, and put in a closing state.
mkersh3 0:e7ca326e76ee 244 * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
mkersh3 0:e7ca326e76ee 245 * unsafe to reference it (unless an error is returned).
mkersh3 0:e7ca326e76ee 246 *
mkersh3 0:e7ca326e76ee 247 * @param pcb the tcp_pcb to close
mkersh3 0:e7ca326e76ee 248 * @return ERR_OK if connection has been closed
mkersh3 0:e7ca326e76ee 249 * another err_t if closing failed and pcb is not freed
mkersh3 0:e7ca326e76ee 250 */
mkersh3 0:e7ca326e76ee 251 err_t
mkersh3 0:e7ca326e76ee 252 tcp_close(struct tcp_pcb *pcb)
mkersh3 0:e7ca326e76ee 253 {
mkersh3 0:e7ca326e76ee 254 #if TCP_DEBUG
mkersh3 0:e7ca326e76ee 255 LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
mkersh3 0:e7ca326e76ee 256 tcp_debug_print_state(pcb->state);
mkersh3 0:e7ca326e76ee 257 #endif /* TCP_DEBUG */
mkersh3 0:e7ca326e76ee 258
mkersh3 0:e7ca326e76ee 259 if (pcb->state != LISTEN) {
mkersh3 0:e7ca326e76ee 260 /* Set a flag not to receive any more data... */
mkersh3 0:e7ca326e76ee 261 pcb->flags |= TF_RXCLOSED;
mkersh3 0:e7ca326e76ee 262 }
mkersh3 0:e7ca326e76ee 263 /* ... and close */
mkersh3 0:e7ca326e76ee 264 return tcp_close_shutdown(pcb, 1);
mkersh3 0:e7ca326e76ee 265 }
mkersh3 0:e7ca326e76ee 266
mkersh3 0:e7ca326e76ee 267 /**
mkersh3 0:e7ca326e76ee 268 * Causes all or part of a full-duplex connection of this PCB to be shut down.
mkersh3 0:e7ca326e76ee 269 * This doesn't deallocate the PCB!
mkersh3 0:e7ca326e76ee 270 *
mkersh3 0:e7ca326e76ee 271 * @param pcb PCB to shutdown
mkersh3 0:e7ca326e76ee 272 * @param shut_rx shut down receive side if this is != 0
mkersh3 0:e7ca326e76ee 273 * @param shut_tx shut down send side if this is != 0
mkersh3 0:e7ca326e76ee 274 * @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
mkersh3 0:e7ca326e76ee 275 * another err_t on error.
mkersh3 0:e7ca326e76ee 276 */
mkersh3 0:e7ca326e76ee 277 err_t
mkersh3 0:e7ca326e76ee 278 tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
mkersh3 0:e7ca326e76ee 279 {
mkersh3 0:e7ca326e76ee 280 if (pcb->state == LISTEN) {
mkersh3 0:e7ca326e76ee 281 return ERR_CONN;
mkersh3 0:e7ca326e76ee 282 }
mkersh3 0:e7ca326e76ee 283 if (shut_rx) {
mkersh3 0:e7ca326e76ee 284 /* shut down the receive side: free buffered data... */
mkersh3 0:e7ca326e76ee 285 if (pcb->refused_data != NULL) {
mkersh3 0:e7ca326e76ee 286 pbuf_free(pcb->refused_data);
mkersh3 0:e7ca326e76ee 287 pcb->refused_data = NULL;
mkersh3 0:e7ca326e76ee 288 }
mkersh3 0:e7ca326e76ee 289 /* ... and set a flag not to receive any more data */
mkersh3 0:e7ca326e76ee 290 pcb->flags |= TF_RXCLOSED;
mkersh3 0:e7ca326e76ee 291 }
mkersh3 0:e7ca326e76ee 292 if (shut_tx) {
mkersh3 0:e7ca326e76ee 293 /* This can't happen twice since if it succeeds, the pcb's state is changed.
mkersh3 0:e7ca326e76ee 294 Only close in these states as the others directly deallocate the PCB */
mkersh3 0:e7ca326e76ee 295 switch (pcb->state) {
mkersh3 0:e7ca326e76ee 296 case SYN_RCVD:
mkersh3 0:e7ca326e76ee 297 case ESTABLISHED:
mkersh3 0:e7ca326e76ee 298 case CLOSE_WAIT:
mkersh3 0:e7ca326e76ee 299 return tcp_close_shutdown(pcb, 0);
mkersh3 0:e7ca326e76ee 300 default:
mkersh3 0:e7ca326e76ee 301 /* don't shut down other states */
mkersh3 0:e7ca326e76ee 302 break;
mkersh3 0:e7ca326e76ee 303 }
mkersh3 0:e7ca326e76ee 304 }
mkersh3 0:e7ca326e76ee 305 /* @todo: return another err_t if not in correct state or already shut? */
mkersh3 0:e7ca326e76ee 306 return ERR_OK;
mkersh3 0:e7ca326e76ee 307 }
mkersh3 0:e7ca326e76ee 308
mkersh3 0:e7ca326e76ee 309 /**
mkersh3 0:e7ca326e76ee 310 * Abandons a connection and optionally sends a RST to the remote
mkersh3 0:e7ca326e76ee 311 * host. Deletes the local protocol control block. This is done when
mkersh3 0:e7ca326e76ee 312 * a connection is killed because of shortage of memory.
mkersh3 0:e7ca326e76ee 313 *
mkersh3 0:e7ca326e76ee 314 * @param pcb the tcp_pcb to abort
mkersh3 0:e7ca326e76ee 315 * @param reset boolean to indicate whether a reset should be sent
mkersh3 0:e7ca326e76ee 316 */
mkersh3 0:e7ca326e76ee 317 void
mkersh3 0:e7ca326e76ee 318 tcp_abandon(struct tcp_pcb *pcb, int reset)
mkersh3 0:e7ca326e76ee 319 {
mkersh3 0:e7ca326e76ee 320 u32_t seqno, ackno;
mkersh3 0:e7ca326e76ee 321 u16_t remote_port, local_port;
mkersh3 0:e7ca326e76ee 322 ip_addr_t remote_ip, local_ip;
mkersh3 0:e7ca326e76ee 323 #if LWIP_CALLBACK_API
mkersh3 0:e7ca326e76ee 324 tcp_err_fn errf;
mkersh3 0:e7ca326e76ee 325 #endif /* LWIP_CALLBACK_API */
mkersh3 0:e7ca326e76ee 326 void *errf_arg;
mkersh3 0:e7ca326e76ee 327
mkersh3 0:e7ca326e76ee 328 /* pcb->state LISTEN not allowed here */
mkersh3 0:e7ca326e76ee 329 LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
mkersh3 0:e7ca326e76ee 330 pcb->state != LISTEN);
mkersh3 0:e7ca326e76ee 331 /* Figure out on which TCP PCB list we are, and remove us. If we
mkersh3 0:e7ca326e76ee 332 are in an active state, call the receive function associated with
mkersh3 0:e7ca326e76ee 333 the PCB with a NULL argument, and send an RST to the remote end. */
mkersh3 0:e7ca326e76ee 334 if (pcb->state == TIME_WAIT) {
mkersh3 0:e7ca326e76ee 335 tcp_pcb_remove(&tcp_tw_pcbs, pcb);
mkersh3 0:e7ca326e76ee 336 memp_free(MEMP_TCP_PCB, pcb);
mkersh3 0:e7ca326e76ee 337 } else {
mkersh3 0:e7ca326e76ee 338 seqno = pcb->snd_nxt;
mkersh3 0:e7ca326e76ee 339 ackno = pcb->rcv_nxt;
mkersh3 0:e7ca326e76ee 340 ip_addr_copy(local_ip, pcb->local_ip);
mkersh3 0:e7ca326e76ee 341 ip_addr_copy(remote_ip, pcb->remote_ip);
mkersh3 0:e7ca326e76ee 342 local_port = pcb->local_port;
mkersh3 0:e7ca326e76ee 343 remote_port = pcb->remote_port;
mkersh3 0:e7ca326e76ee 344 #if LWIP_CALLBACK_API
mkersh3 0:e7ca326e76ee 345 errf = pcb->errf;
mkersh3 0:e7ca326e76ee 346 #endif /* LWIP_CALLBACK_API */
mkersh3 0:e7ca326e76ee 347 errf_arg = pcb->callback_arg;
mkersh3 0:e7ca326e76ee 348 tcp_pcb_remove(&tcp_active_pcbs, pcb);
mkersh3 0:e7ca326e76ee 349 if (pcb->unacked != NULL) {
mkersh3 0:e7ca326e76ee 350 tcp_segs_free(pcb->unacked);
mkersh3 0:e7ca326e76ee 351 }
mkersh3 0:e7ca326e76ee 352 if (pcb->unsent != NULL) {
mkersh3 0:e7ca326e76ee 353 tcp_segs_free(pcb->unsent);
mkersh3 0:e7ca326e76ee 354 }
mkersh3 0:e7ca326e76ee 355 #if TCP_QUEUE_OOSEQ
mkersh3 0:e7ca326e76ee 356 if (pcb->ooseq != NULL) {
mkersh3 0:e7ca326e76ee 357 tcp_segs_free(pcb->ooseq);
mkersh3 0:e7ca326e76ee 358 }
mkersh3 0:e7ca326e76ee 359 #endif /* TCP_QUEUE_OOSEQ */
mkersh3 0:e7ca326e76ee 360 memp_free(MEMP_TCP_PCB, pcb);
mkersh3 0:e7ca326e76ee 361 TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
mkersh3 0:e7ca326e76ee 362 if (reset) {
mkersh3 0:e7ca326e76ee 363 LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
mkersh3 0:e7ca326e76ee 364 tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port);
mkersh3 0:e7ca326e76ee 365 }
mkersh3 0:e7ca326e76ee 366 }
mkersh3 0:e7ca326e76ee 367 }
mkersh3 0:e7ca326e76ee 368
mkersh3 0:e7ca326e76ee 369 /**
mkersh3 0:e7ca326e76ee 370 * Aborts the connection by sending a RST (reset) segment to the remote
mkersh3 0:e7ca326e76ee 371 * host. The pcb is deallocated. This function never fails.
mkersh3 0:e7ca326e76ee 372 *
mkersh3 0:e7ca326e76ee 373 * ATTENTION: When calling this from one of the TCP callbacks, make
mkersh3 0:e7ca326e76ee 374 * sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
mkersh3 0:e7ca326e76ee 375 * or you will risk accessing deallocated memory or memory leaks!
mkersh3 0:e7ca326e76ee 376 *
mkersh3 0:e7ca326e76ee 377 * @param pcb the tcp pcb to abort
mkersh3 0:e7ca326e76ee 378 */
mkersh3 0:e7ca326e76ee 379 void
mkersh3 0:e7ca326e76ee 380 tcp_abort(struct tcp_pcb *pcb)
mkersh3 0:e7ca326e76ee 381 {
mkersh3 0:e7ca326e76ee 382 tcp_abandon(pcb, 1);
mkersh3 0:e7ca326e76ee 383 }
mkersh3 0:e7ca326e76ee 384
mkersh3 0:e7ca326e76ee 385 /**
mkersh3 0:e7ca326e76ee 386 * Binds the connection to a local portnumber and IP address. If the
mkersh3 0:e7ca326e76ee 387 * IP address is not given (i.e., ipaddr == NULL), the IP address of
mkersh3 0:e7ca326e76ee 388 * the outgoing network interface is used instead.
mkersh3 0:e7ca326e76ee 389 *
mkersh3 0:e7ca326e76ee 390 * @param pcb the tcp_pcb to bind (no check is done whether this pcb is
mkersh3 0:e7ca326e76ee 391 * already bound!)
mkersh3 0:e7ca326e76ee 392 * @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
mkersh3 0:e7ca326e76ee 393 * to any local address
mkersh3 0:e7ca326e76ee 394 * @param port the local port to bind to
mkersh3 0:e7ca326e76ee 395 * @return ERR_USE if the port is already in use
mkersh3 0:e7ca326e76ee 396 * ERR_VAL if bind failed because the PCB is not in a valid state
mkersh3 0:e7ca326e76ee 397 * ERR_OK if bound
mkersh3 0:e7ca326e76ee 398 */
mkersh3 0:e7ca326e76ee 399 err_t
mkersh3 0:e7ca326e76ee 400 tcp_bind(struct tcp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
mkersh3 0:e7ca326e76ee 401 {
mkersh3 0:e7ca326e76ee 402 int i;
mkersh3 0:e7ca326e76ee 403 int max_pcb_list = NUM_TCP_PCB_LISTS;
mkersh3 0:e7ca326e76ee 404 struct tcp_pcb *cpcb;
mkersh3 0:e7ca326e76ee 405
mkersh3 0:e7ca326e76ee 406 LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_VAL);
mkersh3 0:e7ca326e76ee 407
mkersh3 0:e7ca326e76ee 408 #if SO_REUSE
mkersh3 0:e7ca326e76ee 409 /* Unless the REUSEADDR flag is set,
mkersh3 0:e7ca326e76ee 410 we have to check the pcbs in TIME-WAIT state, also.
mkersh3 0:e7ca326e76ee 411 We do not dump TIME_WAIT pcb's; they can still be matched by incoming
mkersh3 0:e7ca326e76ee 412 packets using both local and remote IP addresses and ports to distinguish.
mkersh3 0:e7ca326e76ee 413 */
mkersh3 0:e7ca326e76ee 414 if ((pcb->so_options & SOF_REUSEADDR) != 0) {
mkersh3 0:e7ca326e76ee 415 max_pcb_list = NUM_TCP_PCB_LISTS_NO_TIME_WAIT;
mkersh3 0:e7ca326e76ee 416 }
mkersh3 0:e7ca326e76ee 417 #endif /* SO_REUSE */
mkersh3 0:e7ca326e76ee 418
mkersh3 0:e7ca326e76ee 419 if (port == 0) {
mkersh3 0:e7ca326e76ee 420 port = tcp_new_port();
mkersh3 0:e7ca326e76ee 421 }
mkersh3 0:e7ca326e76ee 422
mkersh3 0:e7ca326e76ee 423 /* Check if the address already is in use (on all lists) */
mkersh3 0:e7ca326e76ee 424 for (i = 0; i < max_pcb_list; i++) {
mkersh3 0:e7ca326e76ee 425 for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
mkersh3 0:e7ca326e76ee 426 if (cpcb->local_port == port) {
mkersh3 0:e7ca326e76ee 427 #if SO_REUSE
mkersh3 0:e7ca326e76ee 428 /* Omit checking for the same port if both pcbs have REUSEADDR set.
mkersh3 0:e7ca326e76ee 429 For SO_REUSEADDR, the duplicate-check for a 5-tuple is done in
mkersh3 0:e7ca326e76ee 430 tcp_connect. */
mkersh3 0:e7ca326e76ee 431 if (((pcb->so_options & SOF_REUSEADDR) == 0) ||
mkersh3 0:e7ca326e76ee 432 ((cpcb->so_options & SOF_REUSEADDR) == 0))
mkersh3 0:e7ca326e76ee 433 #endif /* SO_REUSE */
mkersh3 0:e7ca326e76ee 434 {
mkersh3 0:e7ca326e76ee 435 if (ip_addr_isany(&(cpcb->local_ip)) ||
mkersh3 0:e7ca326e76ee 436 ip_addr_isany(ipaddr) ||
mkersh3 0:e7ca326e76ee 437 ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
mkersh3 0:e7ca326e76ee 438 return ERR_USE;
mkersh3 0:e7ca326e76ee 439 }
mkersh3 0:e7ca326e76ee 440 }
mkersh3 0:e7ca326e76ee 441 }
mkersh3 0:e7ca326e76ee 442 }
mkersh3 0:e7ca326e76ee 443 }
mkersh3 0:e7ca326e76ee 444
mkersh3 0:e7ca326e76ee 445 if (!ip_addr_isany(ipaddr)) {
mkersh3 0:e7ca326e76ee 446 pcb->local_ip = *ipaddr;
mkersh3 0:e7ca326e76ee 447 }
mkersh3 0:e7ca326e76ee 448 pcb->local_port = port;
mkersh3 0:e7ca326e76ee 449 TCP_REG(&tcp_bound_pcbs, pcb);
mkersh3 0:e7ca326e76ee 450 LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
mkersh3 0:e7ca326e76ee 451 return ERR_OK;
mkersh3 0:e7ca326e76ee 452 }
mkersh3 0:e7ca326e76ee 453 #if LWIP_CALLBACK_API
mkersh3 0:e7ca326e76ee 454 /**
mkersh3 0:e7ca326e76ee 455 * Default accept callback if no accept callback is specified by the user.
mkersh3 0:e7ca326e76ee 456 */
mkersh3 0:e7ca326e76ee 457 static err_t
mkersh3 0:e7ca326e76ee 458 tcp_accept_null(void *arg, struct tcp_pcb *pcb, err_t err)
mkersh3 0:e7ca326e76ee 459 {
mkersh3 0:e7ca326e76ee 460 LWIP_UNUSED_ARG(arg);
mkersh3 0:e7ca326e76ee 461 LWIP_UNUSED_ARG(pcb);
mkersh3 0:e7ca326e76ee 462 LWIP_UNUSED_ARG(err);
mkersh3 0:e7ca326e76ee 463
mkersh3 0:e7ca326e76ee 464 return ERR_ABRT;
mkersh3 0:e7ca326e76ee 465 }
mkersh3 0:e7ca326e76ee 466 #endif /* LWIP_CALLBACK_API */
mkersh3 0:e7ca326e76ee 467
mkersh3 0:e7ca326e76ee 468 /**
mkersh3 0:e7ca326e76ee 469 * Set the state of the connection to be LISTEN, which means that it
mkersh3 0:e7ca326e76ee 470 * is able to accept incoming connections. The protocol control block
mkersh3 0:e7ca326e76ee 471 * is reallocated in order to consume less memory. Setting the
mkersh3 0:e7ca326e76ee 472 * connection to LISTEN is an irreversible process.
mkersh3 0:e7ca326e76ee 473 *
mkersh3 0:e7ca326e76ee 474 * @param pcb the original tcp_pcb
mkersh3 0:e7ca326e76ee 475 * @param backlog the incoming connections queue limit
mkersh3 0:e7ca326e76ee 476 * @return tcp_pcb used for listening, consumes less memory.
mkersh3 0:e7ca326e76ee 477 *
mkersh3 0:e7ca326e76ee 478 * @note The original tcp_pcb is freed. This function therefore has to be
mkersh3 0:e7ca326e76ee 479 * called like this:
mkersh3 0:e7ca326e76ee 480 * tpcb = tcp_listen(tpcb);
mkersh3 0:e7ca326e76ee 481 */
mkersh3 0:e7ca326e76ee 482 struct tcp_pcb *
mkersh3 0:e7ca326e76ee 483 tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
mkersh3 0:e7ca326e76ee 484 {
mkersh3 0:e7ca326e76ee 485 struct tcp_pcb_listen *lpcb;
mkersh3 0:e7ca326e76ee 486
mkersh3 0:e7ca326e76ee 487 LWIP_UNUSED_ARG(backlog);
mkersh3 0:e7ca326e76ee 488 LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL);
mkersh3 0:e7ca326e76ee 489
mkersh3 0:e7ca326e76ee 490 /* already listening? */
mkersh3 0:e7ca326e76ee 491 if (pcb->state == LISTEN) {
mkersh3 0:e7ca326e76ee 492 return pcb;
mkersh3 0:e7ca326e76ee 493 }
mkersh3 0:e7ca326e76ee 494 #if SO_REUSE
mkersh3 0:e7ca326e76ee 495 if ((pcb->so_options & SOF_REUSEADDR) != 0) {
mkersh3 0:e7ca326e76ee 496 /* Since SOF_REUSEADDR allows reusing a local address before the pcb's usage
mkersh3 0:e7ca326e76ee 497 is declared (listen-/connection-pcb), we have to make sure now that
mkersh3 0:e7ca326e76ee 498 this port is only used once for every local IP. */
mkersh3 0:e7ca326e76ee 499 for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
mkersh3 0:e7ca326e76ee 500 if (lpcb->local_port == pcb->local_port) {
mkersh3 0:e7ca326e76ee 501 if (ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
mkersh3 0:e7ca326e76ee 502 /* this address/port is already used */
mkersh3 0:e7ca326e76ee 503 return NULL;
mkersh3 0:e7ca326e76ee 504 }
mkersh3 0:e7ca326e76ee 505 }
mkersh3 0:e7ca326e76ee 506 }
mkersh3 0:e7ca326e76ee 507 }
mkersh3 0:e7ca326e76ee 508 #endif /* SO_REUSE */
mkersh3 0:e7ca326e76ee 509 lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
mkersh3 0:e7ca326e76ee 510 if (lpcb == NULL) {
mkersh3 0:e7ca326e76ee 511 return NULL;
mkersh3 0:e7ca326e76ee 512 }
mkersh3 0:e7ca326e76ee 513 lpcb->callback_arg = pcb->callback_arg;
mkersh3 0:e7ca326e76ee 514 lpcb->local_port = pcb->local_port;
mkersh3 0:e7ca326e76ee 515 lpcb->state = LISTEN;
mkersh3 0:e7ca326e76ee 516 lpcb->prio = pcb->prio;
mkersh3 0:e7ca326e76ee 517 lpcb->so_options = pcb->so_options;
mkersh3 0:e7ca326e76ee 518 lpcb->so_options |= SOF_ACCEPTCONN;
mkersh3 0:e7ca326e76ee 519 lpcb->ttl = pcb->ttl;
mkersh3 0:e7ca326e76ee 520 lpcb->tos = pcb->tos;
mkersh3 0:e7ca326e76ee 521 ip_addr_copy(lpcb->local_ip, pcb->local_ip);
mkersh3 0:e7ca326e76ee 522 if (pcb->local_port != 0) {
mkersh3 0:e7ca326e76ee 523 TCP_RMV(&tcp_bound_pcbs, pcb);
mkersh3 0:e7ca326e76ee 524 }
mkersh3 0:e7ca326e76ee 525 memp_free(MEMP_TCP_PCB, pcb);
mkersh3 0:e7ca326e76ee 526 #if LWIP_CALLBACK_API
mkersh3 0:e7ca326e76ee 527 lpcb->accept = tcp_accept_null;
mkersh3 0:e7ca326e76ee 528 #endif /* LWIP_CALLBACK_API */
mkersh3 0:e7ca326e76ee 529 #if TCP_LISTEN_BACKLOG
mkersh3 0:e7ca326e76ee 530 lpcb->accepts_pending = 0;
mkersh3 0:e7ca326e76ee 531 lpcb->backlog = (backlog ? backlog : 1);
mkersh3 0:e7ca326e76ee 532 #endif /* TCP_LISTEN_BACKLOG */
mkersh3 0:e7ca326e76ee 533 TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
mkersh3 0:e7ca326e76ee 534 return (struct tcp_pcb *)lpcb;
mkersh3 0:e7ca326e76ee 535 }
mkersh3 0:e7ca326e76ee 536
mkersh3 0:e7ca326e76ee 537 /**
mkersh3 0:e7ca326e76ee 538 * Update the state that tracks the available window space to advertise.
mkersh3 0:e7ca326e76ee 539 *
mkersh3 0:e7ca326e76ee 540 * Returns how much extra window would be advertised if we sent an
mkersh3 0:e7ca326e76ee 541 * update now.
mkersh3 0:e7ca326e76ee 542 */
mkersh3 0:e7ca326e76ee 543 u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
mkersh3 0:e7ca326e76ee 544 {
mkersh3 0:e7ca326e76ee 545 u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
mkersh3 0:e7ca326e76ee 546
mkersh3 0:e7ca326e76ee 547 if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) {
mkersh3 0:e7ca326e76ee 548 /* we can advertise more window */
mkersh3 0:e7ca326e76ee 549 pcb->rcv_ann_wnd = pcb->rcv_wnd;
mkersh3 0:e7ca326e76ee 550 return new_right_edge - pcb->rcv_ann_right_edge;
mkersh3 0:e7ca326e76ee 551 } else {
mkersh3 0:e7ca326e76ee 552 if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
mkersh3 0:e7ca326e76ee 553 /* Can happen due to other end sending out of advertised window,
mkersh3 0:e7ca326e76ee 554 * but within actual available (but not yet advertised) window */
mkersh3 0:e7ca326e76ee 555 pcb->rcv_ann_wnd = 0;
mkersh3 0:e7ca326e76ee 556 } else {
mkersh3 0:e7ca326e76ee 557 /* keep the right edge of window constant */
mkersh3 0:e7ca326e76ee 558 u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
mkersh3 0:e7ca326e76ee 559 LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff", new_rcv_ann_wnd <= 0xffff);
mkersh3 0:e7ca326e76ee 560 pcb->rcv_ann_wnd = (u16_t)new_rcv_ann_wnd;
mkersh3 0:e7ca326e76ee 561 }
mkersh3 0:e7ca326e76ee 562 return 0;
mkersh3 0:e7ca326e76ee 563 }
mkersh3 0:e7ca326e76ee 564 }
mkersh3 0:e7ca326e76ee 565
mkersh3 0:e7ca326e76ee 566 /**
mkersh3 0:e7ca326e76ee 567 * This function should be called by the application when it has
mkersh3 0:e7ca326e76ee 568 * processed the data. The purpose is to advertise a larger window
mkersh3 0:e7ca326e76ee 569 * when the data has been processed.
mkersh3 0:e7ca326e76ee 570 *
mkersh3 0:e7ca326e76ee 571 * @param pcb the tcp_pcb for which data is read
mkersh3 0:e7ca326e76ee 572 * @param len the amount of bytes that have been read by the application
mkersh3 0:e7ca326e76ee 573 */
mkersh3 0:e7ca326e76ee 574 void
mkersh3 0:e7ca326e76ee 575 tcp_recved(struct tcp_pcb *pcb, u16_t len)
mkersh3 0:e7ca326e76ee 576 {
mkersh3 0:e7ca326e76ee 577 int wnd_inflation;
mkersh3 0:e7ca326e76ee 578
mkersh3 0:e7ca326e76ee 579 LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
mkersh3 0:e7ca326e76ee 580 len <= 0xffff - pcb->rcv_wnd );
mkersh3 0:e7ca326e76ee 581
mkersh3 0:e7ca326e76ee 582 pcb->rcv_wnd += len;
mkersh3 0:e7ca326e76ee 583 if (pcb->rcv_wnd > TCP_WND) {
mkersh3 0:e7ca326e76ee 584 pcb->rcv_wnd = TCP_WND;
mkersh3 0:e7ca326e76ee 585 }
mkersh3 0:e7ca326e76ee 586
mkersh3 0:e7ca326e76ee 587 wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
mkersh3 0:e7ca326e76ee 588
mkersh3 0:e7ca326e76ee 589 /* If the change in the right edge of window is significant (default
mkersh3 0:e7ca326e76ee 590 * watermark is TCP_WND/4), then send an explicit update now.
mkersh3 0:e7ca326e76ee 591 * Otherwise wait for a packet to be sent in the normal course of
mkersh3 0:e7ca326e76ee 592 * events (or more window to be available later) */
mkersh3 0:e7ca326e76ee 593 if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
mkersh3 0:e7ca326e76ee 594 tcp_ack_now(pcb);
mkersh3 0:e7ca326e76ee 595 tcp_output(pcb);
mkersh3 0:e7ca326e76ee 596 }
mkersh3 0:e7ca326e76ee 597
mkersh3 0:e7ca326e76ee 598 LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
mkersh3 0:e7ca326e76ee 599 len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
mkersh3 0:e7ca326e76ee 600 }
mkersh3 0:e7ca326e76ee 601
mkersh3 0:e7ca326e76ee 602 /**
mkersh3 0:e7ca326e76ee 603 * A nastly hack featuring 'goto' statements that allocates a
mkersh3 0:e7ca326e76ee 604 * new TCP local port.
mkersh3 0:e7ca326e76ee 605 *
mkersh3 0:e7ca326e76ee 606 * @return a new (free) local TCP port number
mkersh3 0:e7ca326e76ee 607 */
mkersh3 0:e7ca326e76ee 608 static u16_t
mkersh3 0:e7ca326e76ee 609 tcp_new_port(void)
mkersh3 0:e7ca326e76ee 610 {
mkersh3 0:e7ca326e76ee 611 int i;
mkersh3 0:e7ca326e76ee 612 struct tcp_pcb *pcb;
mkersh3 0:e7ca326e76ee 613 #ifndef TCP_LOCAL_PORT_RANGE_START
mkersh3 0:e7ca326e76ee 614 /* From http://www.iana.org/assignments/port-numbers:
mkersh3 0:e7ca326e76ee 615 "The Dynamic and/or Private Ports are those from 49152 through 65535" */
mkersh3 0:e7ca326e76ee 616 #define TCP_LOCAL_PORT_RANGE_START 0xc000
mkersh3 0:e7ca326e76ee 617 #define TCP_LOCAL_PORT_RANGE_END 0xffff
mkersh3 0:e7ca326e76ee 618 #endif
mkersh3 0:e7ca326e76ee 619 static u16_t port = TCP_LOCAL_PORT_RANGE_START;
mkersh3 0:e7ca326e76ee 620
mkersh3 0:e7ca326e76ee 621 again:
mkersh3 0:e7ca326e76ee 622 if (port++ >= TCP_LOCAL_PORT_RANGE_END) {
mkersh3 0:e7ca326e76ee 623 port = TCP_LOCAL_PORT_RANGE_START;
mkersh3 0:e7ca326e76ee 624 }
mkersh3 0:e7ca326e76ee 625 /* Check all PCB lists. */
mkersh3 0:e7ca326e76ee 626 for (i = 0; i < NUM_TCP_PCB_LISTS; i++) {
mkersh3 0:e7ca326e76ee 627 for(pcb = *tcp_pcb_lists[i]; pcb != NULL; pcb = pcb->next) {
mkersh3 0:e7ca326e76ee 628 if (pcb->local_port == port) {
mkersh3 0:e7ca326e76ee 629 goto again;
mkersh3 0:e7ca326e76ee 630 }
mkersh3 0:e7ca326e76ee 631 }
mkersh3 0:e7ca326e76ee 632 }
mkersh3 0:e7ca326e76ee 633 return port;
mkersh3 0:e7ca326e76ee 634 }
mkersh3 0:e7ca326e76ee 635
mkersh3 0:e7ca326e76ee 636 /**
mkersh3 0:e7ca326e76ee 637 * Connects to another host. The function given as the "connected"
mkersh3 0:e7ca326e76ee 638 * argument will be called when the connection has been established.
mkersh3 0:e7ca326e76ee 639 *
mkersh3 0:e7ca326e76ee 640 * @param pcb the tcp_pcb used to establish the connection
mkersh3 0:e7ca326e76ee 641 * @param ipaddr the remote ip address to connect to
mkersh3 0:e7ca326e76ee 642 * @param port the remote tcp port to connect to
mkersh3 0:e7ca326e76ee 643 * @param connected callback function to call when connected (or on error)
mkersh3 0:e7ca326e76ee 644 * @return ERR_VAL if invalid arguments are given
mkersh3 0:e7ca326e76ee 645 * ERR_OK if connect request has been sent
mkersh3 0:e7ca326e76ee 646 * other err_t values if connect request couldn't be sent
mkersh3 0:e7ca326e76ee 647 */
mkersh3 0:e7ca326e76ee 648 err_t
mkersh3 0:e7ca326e76ee 649 tcp_connect(struct tcp_pcb *pcb, ip_addr_t *ipaddr, u16_t port,
mkersh3 0:e7ca326e76ee 650 tcp_connected_fn connected)
mkersh3 0:e7ca326e76ee 651 {
mkersh3 0:e7ca326e76ee 652 err_t ret;
mkersh3 0:e7ca326e76ee 653 u32_t iss;
mkersh3 0:e7ca326e76ee 654 u16_t old_local_port;
mkersh3 0:e7ca326e76ee 655
mkersh3 0:e7ca326e76ee 656 LWIP_ERROR("tcp_connect: can only connect from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
mkersh3 0:e7ca326e76ee 657
mkersh3 0:e7ca326e76ee 658 LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
mkersh3 0:e7ca326e76ee 659 if (ipaddr != NULL) {
mkersh3 0:e7ca326e76ee 660 pcb->remote_ip = *ipaddr;
mkersh3 0:e7ca326e76ee 661 } else {
mkersh3 0:e7ca326e76ee 662 return ERR_VAL;
mkersh3 0:e7ca326e76ee 663 }
mkersh3 0:e7ca326e76ee 664 pcb->remote_port = port;
mkersh3 0:e7ca326e76ee 665
mkersh3 0:e7ca326e76ee 666 /* check if we have a route to the remote host */
mkersh3 0:e7ca326e76ee 667 if (ip_addr_isany(&(pcb->local_ip))) {
mkersh3 0:e7ca326e76ee 668 /* no local IP address set, yet. */
mkersh3 0:e7ca326e76ee 669 struct netif *netif = ip_route(&(pcb->remote_ip));
mkersh3 0:e7ca326e76ee 670 if (netif == NULL) {
mkersh3 0:e7ca326e76ee 671 /* Don't even try to send a SYN packet if we have no route
mkersh3 0:e7ca326e76ee 672 since that will fail. */
mkersh3 0:e7ca326e76ee 673 return ERR_RTE;
mkersh3 0:e7ca326e76ee 674 }
mkersh3 0:e7ca326e76ee 675 /* Use the netif's IP address as local address. */
mkersh3 0:e7ca326e76ee 676 ip_addr_copy(pcb->local_ip, netif->ip_addr);
mkersh3 0:e7ca326e76ee 677 }
mkersh3 0:e7ca326e76ee 678
mkersh3 0:e7ca326e76ee 679 old_local_port = pcb->local_port;
mkersh3 0:e7ca326e76ee 680 if (pcb->local_port == 0) {
mkersh3 0:e7ca326e76ee 681 pcb->local_port = tcp_new_port();
mkersh3 0:e7ca326e76ee 682 }
mkersh3 0:e7ca326e76ee 683 #if SO_REUSE
mkersh3 0:e7ca326e76ee 684 if ((pcb->so_options & SOF_REUSEADDR) != 0) {
mkersh3 0:e7ca326e76ee 685 /* Since SOF_REUSEADDR allows reusing a local address, we have to make sure
mkersh3 0:e7ca326e76ee 686 now that the 5-tuple is unique. */
mkersh3 0:e7ca326e76ee 687 struct tcp_pcb *cpcb;
mkersh3 0:e7ca326e76ee 688 int i;
mkersh3 0:e7ca326e76ee 689 /* Don't check listen- and bound-PCBs, check active- and TIME-WAIT PCBs. */
mkersh3 0:e7ca326e76ee 690 for (i = 2; i < NUM_TCP_PCB_LISTS; i++) {
mkersh3 0:e7ca326e76ee 691 for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
mkersh3 0:e7ca326e76ee 692 if ((cpcb->local_port == pcb->local_port) &&
mkersh3 0:e7ca326e76ee 693 (cpcb->remote_port == port) &&
mkersh3 0:e7ca326e76ee 694 ip_addr_cmp(&cpcb->local_ip, &pcb->local_ip) &&
mkersh3 0:e7ca326e76ee 695 ip_addr_cmp(&cpcb->remote_ip, ipaddr)) {
mkersh3 0:e7ca326e76ee 696 /* linux returns EISCONN here, but ERR_USE should be OK for us */
mkersh3 0:e7ca326e76ee 697 return ERR_USE;
mkersh3 0:e7ca326e76ee 698 }
mkersh3 0:e7ca326e76ee 699 }
mkersh3 0:e7ca326e76ee 700 }
mkersh3 0:e7ca326e76ee 701 }
mkersh3 0:e7ca326e76ee 702 #endif /* SO_REUSE */
mkersh3 0:e7ca326e76ee 703 iss = tcp_next_iss();
mkersh3 0:e7ca326e76ee 704 pcb->rcv_nxt = 0;
mkersh3 0:e7ca326e76ee 705 pcb->snd_nxt = iss;
mkersh3 0:e7ca326e76ee 706 pcb->lastack = iss - 1;
mkersh3 0:e7ca326e76ee 707 pcb->snd_lbb = iss - 1;
mkersh3 0:e7ca326e76ee 708 pcb->rcv_wnd = TCP_WND;
mkersh3 0:e7ca326e76ee 709 pcb->rcv_ann_wnd = TCP_WND;
mkersh3 0:e7ca326e76ee 710 pcb->rcv_ann_right_edge = pcb->rcv_nxt;
mkersh3 0:e7ca326e76ee 711 pcb->snd_wnd = TCP_WND;
mkersh3 0:e7ca326e76ee 712 /* As initial send MSS, we use TCP_MSS but limit it to 536.
mkersh3 0:e7ca326e76ee 713 The send MSS is updated when an MSS option is received. */
mkersh3 0:e7ca326e76ee 714 pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
mkersh3 0:e7ca326e76ee 715 #if TCP_CALCULATE_EFF_SEND_MSS
mkersh3 0:e7ca326e76ee 716 pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr);
mkersh3 0:e7ca326e76ee 717 #endif /* TCP_CALCULATE_EFF_SEND_MSS */
mkersh3 0:e7ca326e76ee 718 pcb->cwnd = 1;
mkersh3 0:e7ca326e76ee 719 pcb->ssthresh = pcb->mss * 10;
mkersh3 0:e7ca326e76ee 720 #if LWIP_CALLBACK_API
mkersh3 0:e7ca326e76ee 721 pcb->connected = connected;
mkersh3 0:e7ca326e76ee 722 #else /* LWIP_CALLBACK_API */
mkersh3 0:e7ca326e76ee 723 LWIP_UNUSED_ARG(connected);
mkersh3 0:e7ca326e76ee 724 #endif /* LWIP_CALLBACK_API */
mkersh3 0:e7ca326e76ee 725
mkersh3 0:e7ca326e76ee 726 /* Send a SYN together with the MSS option. */
mkersh3 0:e7ca326e76ee 727 ret = tcp_enqueue_flags(pcb, TCP_SYN);
mkersh3 0:e7ca326e76ee 728 if (ret == ERR_OK) {
mkersh3 0:e7ca326e76ee 729 /* SYN segment was enqueued, changed the pcbs state now */
mkersh3 0:e7ca326e76ee 730 pcb->state = SYN_SENT;
mkersh3 0:e7ca326e76ee 731 if (old_local_port != 0) {
mkersh3 0:e7ca326e76ee 732 TCP_RMV(&tcp_bound_pcbs, pcb);
mkersh3 0:e7ca326e76ee 733 }
mkersh3 0:e7ca326e76ee 734 TCP_REG(&tcp_active_pcbs, pcb);
mkersh3 0:e7ca326e76ee 735 snmp_inc_tcpactiveopens();
mkersh3 0:e7ca326e76ee 736
mkersh3 0:e7ca326e76ee 737 tcp_output(pcb);
mkersh3 0:e7ca326e76ee 738 }
mkersh3 0:e7ca326e76ee 739 return ret;
mkersh3 0:e7ca326e76ee 740 }
mkersh3 0:e7ca326e76ee 741
mkersh3 0:e7ca326e76ee 742 /**
mkersh3 0:e7ca326e76ee 743 * Called every 500 ms and implements the retransmission timer and the timer that
mkersh3 0:e7ca326e76ee 744 * removes PCBs that have been in TIME-WAIT for enough time. It also increments
mkersh3 0:e7ca326e76ee 745 * various timers such as the inactivity timer in each PCB.
mkersh3 0:e7ca326e76ee 746 *
mkersh3 0:e7ca326e76ee 747 * Automatically called from tcp_tmr().
mkersh3 0:e7ca326e76ee 748 */
mkersh3 0:e7ca326e76ee 749 void
mkersh3 0:e7ca326e76ee 750 tcp_slowtmr(void)
mkersh3 0:e7ca326e76ee 751 {
mkersh3 0:e7ca326e76ee 752 struct tcp_pcb *pcb, *prev;
mkersh3 0:e7ca326e76ee 753 u16_t eff_wnd;
mkersh3 0:e7ca326e76ee 754 u8_t pcb_remove; /* flag if a PCB should be removed */
mkersh3 0:e7ca326e76ee 755 u8_t pcb_reset; /* flag if a RST should be sent when removing */
mkersh3 0:e7ca326e76ee 756 err_t err;
mkersh3 0:e7ca326e76ee 757
mkersh3 0:e7ca326e76ee 758 err = ERR_OK;
mkersh3 0:e7ca326e76ee 759
mkersh3 0:e7ca326e76ee 760 ++tcp_ticks;
mkersh3 0:e7ca326e76ee 761
mkersh3 0:e7ca326e76ee 762 /* Steps through all of the active PCBs. */
mkersh3 0:e7ca326e76ee 763 prev = NULL;
mkersh3 0:e7ca326e76ee 764 pcb = tcp_active_pcbs;
mkersh3 0:e7ca326e76ee 765 if (pcb == NULL) {
mkersh3 0:e7ca326e76ee 766 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
mkersh3 0:e7ca326e76ee 767 }
mkersh3 0:e7ca326e76ee 768 while (pcb != NULL) {
mkersh3 0:e7ca326e76ee 769 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
mkersh3 0:e7ca326e76ee 770 LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
mkersh3 0:e7ca326e76ee 771 LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
mkersh3 0:e7ca326e76ee 772 LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
mkersh3 0:e7ca326e76ee 773
mkersh3 0:e7ca326e76ee 774 pcb_remove = 0;
mkersh3 0:e7ca326e76ee 775 pcb_reset = 0;
mkersh3 0:e7ca326e76ee 776
mkersh3 0:e7ca326e76ee 777 if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
mkersh3 0:e7ca326e76ee 778 ++pcb_remove;
mkersh3 0:e7ca326e76ee 779 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
mkersh3 0:e7ca326e76ee 780 }
mkersh3 0:e7ca326e76ee 781 else if (pcb->nrtx == TCP_MAXRTX) {
mkersh3 0:e7ca326e76ee 782 ++pcb_remove;
mkersh3 0:e7ca326e76ee 783 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
mkersh3 0:e7ca326e76ee 784 } else {
mkersh3 0:e7ca326e76ee 785 if (pcb->persist_backoff > 0) {
mkersh3 0:e7ca326e76ee 786 /* If snd_wnd is zero, use persist timer to send 1 byte probes
mkersh3 0:e7ca326e76ee 787 * instead of using the standard retransmission mechanism. */
mkersh3 0:e7ca326e76ee 788 pcb->persist_cnt++;
mkersh3 0:e7ca326e76ee 789 if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) {
mkersh3 0:e7ca326e76ee 790 pcb->persist_cnt = 0;
mkersh3 0:e7ca326e76ee 791 if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
mkersh3 0:e7ca326e76ee 792 pcb->persist_backoff++;
mkersh3 0:e7ca326e76ee 793 }
mkersh3 0:e7ca326e76ee 794 tcp_zero_window_probe(pcb);
mkersh3 0:e7ca326e76ee 795 }
mkersh3 0:e7ca326e76ee 796 } else {
mkersh3 0:e7ca326e76ee 797 /* Increase the retransmission timer if it is running */
mkersh3 0:e7ca326e76ee 798 if(pcb->rtime >= 0)
mkersh3 0:e7ca326e76ee 799 ++pcb->rtime;
mkersh3 0:e7ca326e76ee 800
mkersh3 0:e7ca326e76ee 801 if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
mkersh3 0:e7ca326e76ee 802 /* Time for a retransmission. */
mkersh3 0:e7ca326e76ee 803 LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
mkersh3 0:e7ca326e76ee 804 " pcb->rto %"S16_F"\n",
mkersh3 0:e7ca326e76ee 805 pcb->rtime, pcb->rto));
mkersh3 0:e7ca326e76ee 806
mkersh3 0:e7ca326e76ee 807 /* Double retransmission time-out unless we are trying to
mkersh3 0:e7ca326e76ee 808 * connect to somebody (i.e., we are in SYN_SENT). */
mkersh3 0:e7ca326e76ee 809 if (pcb->state != SYN_SENT) {
mkersh3 0:e7ca326e76ee 810 pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
mkersh3 0:e7ca326e76ee 811 }
mkersh3 0:e7ca326e76ee 812
mkersh3 0:e7ca326e76ee 813 /* Reset the retransmission timer. */
mkersh3 0:e7ca326e76ee 814 pcb->rtime = 0;
mkersh3 0:e7ca326e76ee 815
mkersh3 0:e7ca326e76ee 816 /* Reduce congestion window and ssthresh. */
mkersh3 0:e7ca326e76ee 817 eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
mkersh3 0:e7ca326e76ee 818 pcb->ssthresh = eff_wnd >> 1;
mkersh3 0:e7ca326e76ee 819 if (pcb->ssthresh < (pcb->mss << 1)) {
mkersh3 0:e7ca326e76ee 820 pcb->ssthresh = (pcb->mss << 1);
mkersh3 0:e7ca326e76ee 821 }
mkersh3 0:e7ca326e76ee 822 pcb->cwnd = pcb->mss;
mkersh3 0:e7ca326e76ee 823 LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F
mkersh3 0:e7ca326e76ee 824 " ssthresh %"U16_F"\n",
mkersh3 0:e7ca326e76ee 825 pcb->cwnd, pcb->ssthresh));
mkersh3 0:e7ca326e76ee 826
mkersh3 0:e7ca326e76ee 827 /* The following needs to be called AFTER cwnd is set to one
mkersh3 0:e7ca326e76ee 828 mss - STJ */
mkersh3 0:e7ca326e76ee 829 tcp_rexmit_rto(pcb);
mkersh3 0:e7ca326e76ee 830 }
mkersh3 0:e7ca326e76ee 831 }
mkersh3 0:e7ca326e76ee 832 }
mkersh3 0:e7ca326e76ee 833 /* Check if this PCB has stayed too long in FIN-WAIT-2 */
mkersh3 0:e7ca326e76ee 834 if (pcb->state == FIN_WAIT_2) {
mkersh3 0:e7ca326e76ee 835 if ((u32_t)(tcp_ticks - pcb->tmr) >
mkersh3 0:e7ca326e76ee 836 TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
mkersh3 0:e7ca326e76ee 837 ++pcb_remove;
mkersh3 0:e7ca326e76ee 838 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
mkersh3 0:e7ca326e76ee 839 }
mkersh3 0:e7ca326e76ee 840 }
mkersh3 0:e7ca326e76ee 841
mkersh3 0:e7ca326e76ee 842 /* Check if KEEPALIVE should be sent */
mkersh3 0:e7ca326e76ee 843 if((pcb->so_options & SOF_KEEPALIVE) &&
mkersh3 0:e7ca326e76ee 844 ((pcb->state == ESTABLISHED) ||
mkersh3 0:e7ca326e76ee 845 (pcb->state == CLOSE_WAIT))) {
mkersh3 0:e7ca326e76ee 846 #if LWIP_TCP_KEEPALIVE
mkersh3 0:e7ca326e76ee 847 if((u32_t)(tcp_ticks - pcb->tmr) >
mkersh3 0:e7ca326e76ee 848 (pcb->keep_idle + (pcb->keep_cnt*pcb->keep_intvl))
mkersh3 0:e7ca326e76ee 849 / TCP_SLOW_INTERVAL)
mkersh3 0:e7ca326e76ee 850 #else
mkersh3 0:e7ca326e76ee 851 if((u32_t)(tcp_ticks - pcb->tmr) >
mkersh3 0:e7ca326e76ee 852 (pcb->keep_idle + TCP_MAXIDLE) / TCP_SLOW_INTERVAL)
mkersh3 0:e7ca326e76ee 853 #endif /* LWIP_TCP_KEEPALIVE */
mkersh3 0:e7ca326e76ee 854 {
mkersh3 0:e7ca326e76ee 855 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n",
mkersh3 0:e7ca326e76ee 856 ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
mkersh3 0:e7ca326e76ee 857 ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
mkersh3 0:e7ca326e76ee 858
mkersh3 0:e7ca326e76ee 859 ++pcb_remove;
mkersh3 0:e7ca326e76ee 860 ++pcb_reset;
mkersh3 0:e7ca326e76ee 861 }
mkersh3 0:e7ca326e76ee 862 #if LWIP_TCP_KEEPALIVE
mkersh3 0:e7ca326e76ee 863 else if((u32_t)(tcp_ticks - pcb->tmr) >
mkersh3 0:e7ca326e76ee 864 (pcb->keep_idle + pcb->keep_cnt_sent * pcb->keep_intvl)
mkersh3 0:e7ca326e76ee 865 / TCP_SLOW_INTERVAL)
mkersh3 0:e7ca326e76ee 866 #else
mkersh3 0:e7ca326e76ee 867 else if((u32_t)(tcp_ticks - pcb->tmr) >
mkersh3 0:e7ca326e76ee 868 (pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEPINTVL_DEFAULT)
mkersh3 0:e7ca326e76ee 869 / TCP_SLOW_INTERVAL)
mkersh3 0:e7ca326e76ee 870 #endif /* LWIP_TCP_KEEPALIVE */
mkersh3 0:e7ca326e76ee 871 {
mkersh3 0:e7ca326e76ee 872 tcp_keepalive(pcb);
mkersh3 0:e7ca326e76ee 873 pcb->keep_cnt_sent++;
mkersh3 0:e7ca326e76ee 874 }
mkersh3 0:e7ca326e76ee 875 }
mkersh3 0:e7ca326e76ee 876
mkersh3 0:e7ca326e76ee 877 /* If this PCB has queued out of sequence data, but has been
mkersh3 0:e7ca326e76ee 878 inactive for too long, will drop the data (it will eventually
mkersh3 0:e7ca326e76ee 879 be retransmitted). */
mkersh3 0:e7ca326e76ee 880 #if TCP_QUEUE_OOSEQ
mkersh3 0:e7ca326e76ee 881 if (pcb->ooseq != NULL &&
mkersh3 0:e7ca326e76ee 882 (u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) {
mkersh3 0:e7ca326e76ee 883 tcp_segs_free(pcb->ooseq);
mkersh3 0:e7ca326e76ee 884 pcb->ooseq = NULL;
mkersh3 0:e7ca326e76ee 885 LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
mkersh3 0:e7ca326e76ee 886 }
mkersh3 0:e7ca326e76ee 887 #endif /* TCP_QUEUE_OOSEQ */
mkersh3 0:e7ca326e76ee 888
mkersh3 0:e7ca326e76ee 889 /* Check if this PCB has stayed too long in SYN-RCVD */
mkersh3 0:e7ca326e76ee 890 if (pcb->state == SYN_RCVD) {
mkersh3 0:e7ca326e76ee 891 if ((u32_t)(tcp_ticks - pcb->tmr) >
mkersh3 0:e7ca326e76ee 892 TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
mkersh3 0:e7ca326e76ee 893 ++pcb_remove;
mkersh3 0:e7ca326e76ee 894 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
mkersh3 0:e7ca326e76ee 895 }
mkersh3 0:e7ca326e76ee 896 }
mkersh3 0:e7ca326e76ee 897
mkersh3 0:e7ca326e76ee 898 /* Check if this PCB has stayed too long in LAST-ACK */
mkersh3 0:e7ca326e76ee 899 if (pcb->state == LAST_ACK) {
mkersh3 0:e7ca326e76ee 900 if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
mkersh3 0:e7ca326e76ee 901 ++pcb_remove;
mkersh3 0:e7ca326e76ee 902 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
mkersh3 0:e7ca326e76ee 903 }
mkersh3 0:e7ca326e76ee 904 }
mkersh3 0:e7ca326e76ee 905
mkersh3 0:e7ca326e76ee 906 /* If the PCB should be removed, do it. */
mkersh3 0:e7ca326e76ee 907 if (pcb_remove) {
mkersh3 0:e7ca326e76ee 908 struct tcp_pcb *pcb2;
mkersh3 0:e7ca326e76ee 909 tcp_pcb_purge(pcb);
mkersh3 0:e7ca326e76ee 910 /* Remove PCB from tcp_active_pcbs list. */
mkersh3 0:e7ca326e76ee 911 if (prev != NULL) {
mkersh3 0:e7ca326e76ee 912 LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
mkersh3 0:e7ca326e76ee 913 prev->next = pcb->next;
mkersh3 0:e7ca326e76ee 914 } else {
mkersh3 0:e7ca326e76ee 915 /* This PCB was the first. */
mkersh3 0:e7ca326e76ee 916 LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
mkersh3 0:e7ca326e76ee 917 tcp_active_pcbs = pcb->next;
mkersh3 0:e7ca326e76ee 918 }
mkersh3 0:e7ca326e76ee 919
mkersh3 0:e7ca326e76ee 920 TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_ABRT);
mkersh3 0:e7ca326e76ee 921 if (pcb_reset) {
mkersh3 0:e7ca326e76ee 922 tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
mkersh3 0:e7ca326e76ee 923 pcb->local_port, pcb->remote_port);
mkersh3 0:e7ca326e76ee 924 }
mkersh3 0:e7ca326e76ee 925
mkersh3 0:e7ca326e76ee 926 pcb2 = pcb;
mkersh3 0:e7ca326e76ee 927 pcb = pcb->next;
mkersh3 0:e7ca326e76ee 928 memp_free(MEMP_TCP_PCB, pcb2);
mkersh3 0:e7ca326e76ee 929 } else {
mkersh3 0:e7ca326e76ee 930 /* get the 'next' element now and work with 'prev' below (in case of abort) */
mkersh3 0:e7ca326e76ee 931 prev = pcb;
mkersh3 0:e7ca326e76ee 932 pcb = pcb->next;
mkersh3 0:e7ca326e76ee 933
mkersh3 0:e7ca326e76ee 934 /* We check if we should poll the connection. */
mkersh3 0:e7ca326e76ee 935 ++prev->polltmr;
mkersh3 0:e7ca326e76ee 936 if (prev->polltmr >= prev->pollinterval) {
mkersh3 0:e7ca326e76ee 937 prev->polltmr = 0;
mkersh3 0:e7ca326e76ee 938 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
mkersh3 0:e7ca326e76ee 939 TCP_EVENT_POLL(prev, err);
mkersh3 0:e7ca326e76ee 940 /* if err == ERR_ABRT, 'prev' is already deallocated */
mkersh3 0:e7ca326e76ee 941 if (err == ERR_OK) {
mkersh3 0:e7ca326e76ee 942 tcp_output(prev);
mkersh3 0:e7ca326e76ee 943 }
mkersh3 0:e7ca326e76ee 944 }
mkersh3 0:e7ca326e76ee 945 }
mkersh3 0:e7ca326e76ee 946 }
mkersh3 0:e7ca326e76ee 947
mkersh3 0:e7ca326e76ee 948
mkersh3 0:e7ca326e76ee 949 /* Steps through all of the TIME-WAIT PCBs. */
mkersh3 0:e7ca326e76ee 950 prev = NULL;
mkersh3 0:e7ca326e76ee 951 pcb = tcp_tw_pcbs;
mkersh3 0:e7ca326e76ee 952 while (pcb != NULL) {
mkersh3 0:e7ca326e76ee 953 LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
mkersh3 0:e7ca326e76ee 954 pcb_remove = 0;
mkersh3 0:e7ca326e76ee 955
mkersh3 0:e7ca326e76ee 956 /* Check if this PCB has stayed long enough in TIME-WAIT */
mkersh3 0:e7ca326e76ee 957 if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
mkersh3 0:e7ca326e76ee 958 ++pcb_remove;
mkersh3 0:e7ca326e76ee 959 }
mkersh3 0:e7ca326e76ee 960
mkersh3 0:e7ca326e76ee 961
mkersh3 0:e7ca326e76ee 962
mkersh3 0:e7ca326e76ee 963 /* If the PCB should be removed, do it. */
mkersh3 0:e7ca326e76ee 964 if (pcb_remove) {
mkersh3 0:e7ca326e76ee 965 struct tcp_pcb *pcb2;
mkersh3 0:e7ca326e76ee 966 tcp_pcb_purge(pcb);
mkersh3 0:e7ca326e76ee 967 /* Remove PCB from tcp_tw_pcbs list. */
mkersh3 0:e7ca326e76ee 968 if (prev != NULL) {
mkersh3 0:e7ca326e76ee 969 LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
mkersh3 0:e7ca326e76ee 970 prev->next = pcb->next;
mkersh3 0:e7ca326e76ee 971 } else {
mkersh3 0:e7ca326e76ee 972 /* This PCB was the first. */
mkersh3 0:e7ca326e76ee 973 LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
mkersh3 0:e7ca326e76ee 974 tcp_tw_pcbs = pcb->next;
mkersh3 0:e7ca326e76ee 975 }
mkersh3 0:e7ca326e76ee 976 pcb2 = pcb;
mkersh3 0:e7ca326e76ee 977 pcb = pcb->next;
mkersh3 0:e7ca326e76ee 978 memp_free(MEMP_TCP_PCB, pcb2);
mkersh3 0:e7ca326e76ee 979 } else {
mkersh3 0:e7ca326e76ee 980 prev = pcb;
mkersh3 0:e7ca326e76ee 981 pcb = pcb->next;
mkersh3 0:e7ca326e76ee 982 }
mkersh3 0:e7ca326e76ee 983 }
mkersh3 0:e7ca326e76ee 984 }
mkersh3 0:e7ca326e76ee 985
mkersh3 0:e7ca326e76ee 986 /**
mkersh3 0:e7ca326e76ee 987 * Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
mkersh3 0:e7ca326e76ee 988 * "refused" by upper layer (application) and sends delayed ACKs.
mkersh3 0:e7ca326e76ee 989 *
mkersh3 0:e7ca326e76ee 990 * Automatically called from tcp_tmr().
mkersh3 0:e7ca326e76ee 991 */
mkersh3 0:e7ca326e76ee 992 void
mkersh3 0:e7ca326e76ee 993 tcp_fasttmr(void)
mkersh3 0:e7ca326e76ee 994 {
mkersh3 0:e7ca326e76ee 995 struct tcp_pcb *pcb = tcp_active_pcbs;
mkersh3 0:e7ca326e76ee 996
mkersh3 0:e7ca326e76ee 997 while(pcb != NULL) {
mkersh3 0:e7ca326e76ee 998 struct tcp_pcb *next = pcb->next;
mkersh3 0:e7ca326e76ee 999 /* If there is data which was previously "refused" by upper layer */
mkersh3 0:e7ca326e76ee 1000 if (pcb->refused_data != NULL) {
mkersh3 0:e7ca326e76ee 1001 /* Notify again application with data previously received. */
mkersh3 0:e7ca326e76ee 1002 err_t err;
mkersh3 0:e7ca326e76ee 1003 LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_fasttmr: notify kept packet\n"));
mkersh3 0:e7ca326e76ee 1004 TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
mkersh3 0:e7ca326e76ee 1005 if (err == ERR_OK) {
mkersh3 0:e7ca326e76ee 1006 pcb->refused_data = NULL;
mkersh3 0:e7ca326e76ee 1007 } else if (err == ERR_ABRT) {
mkersh3 0:e7ca326e76ee 1008 /* if err == ERR_ABRT, 'pcb' is already deallocated */
mkersh3 0:e7ca326e76ee 1009 pcb = NULL;
mkersh3 0:e7ca326e76ee 1010 }
mkersh3 0:e7ca326e76ee 1011 }
mkersh3 0:e7ca326e76ee 1012
mkersh3 0:e7ca326e76ee 1013 /* send delayed ACKs */
mkersh3 0:e7ca326e76ee 1014 if (pcb && (pcb->flags & TF_ACK_DELAY)) {
mkersh3 0:e7ca326e76ee 1015 LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
mkersh3 0:e7ca326e76ee 1016 tcp_ack_now(pcb);
mkersh3 0:e7ca326e76ee 1017 tcp_output(pcb);
mkersh3 0:e7ca326e76ee 1018 pcb->flags &= ~(TF_ACK_DELAY | TF_ACK_NOW);
mkersh3 0:e7ca326e76ee 1019 }
mkersh3 0:e7ca326e76ee 1020
mkersh3 0:e7ca326e76ee 1021 pcb = next;
mkersh3 0:e7ca326e76ee 1022 }
mkersh3 0:e7ca326e76ee 1023 }
mkersh3 0:e7ca326e76ee 1024
mkersh3 0:e7ca326e76ee 1025 /**
mkersh3 0:e7ca326e76ee 1026 * Deallocates a list of TCP segments (tcp_seg structures).
mkersh3 0:e7ca326e76ee 1027 *
mkersh3 0:e7ca326e76ee 1028 * @param seg tcp_seg list of TCP segments to free
mkersh3 0:e7ca326e76ee 1029 */
mkersh3 0:e7ca326e76ee 1030 void
mkersh3 0:e7ca326e76ee 1031 tcp_segs_free(struct tcp_seg *seg)
mkersh3 0:e7ca326e76ee 1032 {
mkersh3 0:e7ca326e76ee 1033 while (seg != NULL) {
mkersh3 0:e7ca326e76ee 1034 struct tcp_seg *next = seg->next;
mkersh3 0:e7ca326e76ee 1035 tcp_seg_free(seg);
mkersh3 0:e7ca326e76ee 1036 seg = next;
mkersh3 0:e7ca326e76ee 1037 }
mkersh3 0:e7ca326e76ee 1038 }
mkersh3 0:e7ca326e76ee 1039
mkersh3 0:e7ca326e76ee 1040 /**
mkersh3 0:e7ca326e76ee 1041 * Frees a TCP segment (tcp_seg structure).
mkersh3 0:e7ca326e76ee 1042 *
mkersh3 0:e7ca326e76ee 1043 * @param seg single tcp_seg to free
mkersh3 0:e7ca326e76ee 1044 */
mkersh3 0:e7ca326e76ee 1045 void
mkersh3 0:e7ca326e76ee 1046 tcp_seg_free(struct tcp_seg *seg)
mkersh3 0:e7ca326e76ee 1047 {
mkersh3 0:e7ca326e76ee 1048 if (seg != NULL) {
mkersh3 0:e7ca326e76ee 1049 if (seg->p != NULL) {
mkersh3 0:e7ca326e76ee 1050 pbuf_free(seg->p);
mkersh3 0:e7ca326e76ee 1051 #if TCP_DEBUG
mkersh3 0:e7ca326e76ee 1052 seg->p = NULL;
mkersh3 0:e7ca326e76ee 1053 #endif /* TCP_DEBUG */
mkersh3 0:e7ca326e76ee 1054 }
mkersh3 0:e7ca326e76ee 1055 memp_free(MEMP_TCP_SEG, seg);
mkersh3 0:e7ca326e76ee 1056 }
mkersh3 0:e7ca326e76ee 1057 }
mkersh3 0:e7ca326e76ee 1058
mkersh3 0:e7ca326e76ee 1059 /**
mkersh3 0:e7ca326e76ee 1060 * Sets the priority of a connection.
mkersh3 0:e7ca326e76ee 1061 *
mkersh3 0:e7ca326e76ee 1062 * @param pcb the tcp_pcb to manipulate
mkersh3 0:e7ca326e76ee 1063 * @param prio new priority
mkersh3 0:e7ca326e76ee 1064 */
mkersh3 0:e7ca326e76ee 1065 void
mkersh3 0:e7ca326e76ee 1066 tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
mkersh3 0:e7ca326e76ee 1067 {
mkersh3 0:e7ca326e76ee 1068 pcb->prio = prio;
mkersh3 0:e7ca326e76ee 1069 }
mkersh3 0:e7ca326e76ee 1070
mkersh3 0:e7ca326e76ee 1071 #if TCP_QUEUE_OOSEQ
mkersh3 0:e7ca326e76ee 1072 /**
mkersh3 0:e7ca326e76ee 1073 * Returns a copy of the given TCP segment.
mkersh3 0:e7ca326e76ee 1074 * The pbuf and data are not copied, only the pointers
mkersh3 0:e7ca326e76ee 1075 *
mkersh3 0:e7ca326e76ee 1076 * @param seg the old tcp_seg
mkersh3 0:e7ca326e76ee 1077 * @return a copy of seg
mkersh3 0:e7ca326e76ee 1078 */
mkersh3 0:e7ca326e76ee 1079 struct tcp_seg *
mkersh3 0:e7ca326e76ee 1080 tcp_seg_copy(struct tcp_seg *seg)
mkersh3 0:e7ca326e76ee 1081 {
mkersh3 0:e7ca326e76ee 1082 struct tcp_seg *cseg;
mkersh3 0:e7ca326e76ee 1083
mkersh3 0:e7ca326e76ee 1084 cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG);
mkersh3 0:e7ca326e76ee 1085 if (cseg == NULL) {
mkersh3 0:e7ca326e76ee 1086 return NULL;
mkersh3 0:e7ca326e76ee 1087 }
mkersh3 0:e7ca326e76ee 1088 SMEMCPY((u8_t *)cseg, (const u8_t *)seg, sizeof(struct tcp_seg));
mkersh3 0:e7ca326e76ee 1089 pbuf_ref(cseg->p);
mkersh3 0:e7ca326e76ee 1090 return cseg;
mkersh3 0:e7ca326e76ee 1091 }
mkersh3 0:e7ca326e76ee 1092 #endif /* TCP_QUEUE_OOSEQ */
mkersh3 0:e7ca326e76ee 1093
mkersh3 0:e7ca326e76ee 1094 #if LWIP_CALLBACK_API
mkersh3 0:e7ca326e76ee 1095 /**
mkersh3 0:e7ca326e76ee 1096 * Default receive callback that is called if the user didn't register
mkersh3 0:e7ca326e76ee 1097 * a recv callback for the pcb.
mkersh3 0:e7ca326e76ee 1098 */
mkersh3 0:e7ca326e76ee 1099 err_t
mkersh3 0:e7ca326e76ee 1100 tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
mkersh3 0:e7ca326e76ee 1101 {
mkersh3 0:e7ca326e76ee 1102 LWIP_UNUSED_ARG(arg);
mkersh3 0:e7ca326e76ee 1103 if (p != NULL) {
mkersh3 0:e7ca326e76ee 1104 tcp_recved(pcb, p->tot_len);
mkersh3 0:e7ca326e76ee 1105 pbuf_free(p);
mkersh3 0:e7ca326e76ee 1106 } else if (err == ERR_OK) {
mkersh3 0:e7ca326e76ee 1107 return tcp_close(pcb);
mkersh3 0:e7ca326e76ee 1108 }
mkersh3 0:e7ca326e76ee 1109 return ERR_OK;
mkersh3 0:e7ca326e76ee 1110 }
mkersh3 0:e7ca326e76ee 1111 #endif /* LWIP_CALLBACK_API */
mkersh3 0:e7ca326e76ee 1112
mkersh3 0:e7ca326e76ee 1113 /**
mkersh3 0:e7ca326e76ee 1114 * Kills the oldest active connection that has lower priority than prio.
mkersh3 0:e7ca326e76ee 1115 *
mkersh3 0:e7ca326e76ee 1116 * @param prio minimum priority
mkersh3 0:e7ca326e76ee 1117 */
mkersh3 0:e7ca326e76ee 1118 static void
mkersh3 0:e7ca326e76ee 1119 tcp_kill_prio(u8_t prio)
mkersh3 0:e7ca326e76ee 1120 {
mkersh3 0:e7ca326e76ee 1121 struct tcp_pcb *pcb, *inactive;
mkersh3 0:e7ca326e76ee 1122 u32_t inactivity;
mkersh3 0:e7ca326e76ee 1123 u8_t mprio;
mkersh3 0:e7ca326e76ee 1124
mkersh3 0:e7ca326e76ee 1125
mkersh3 0:e7ca326e76ee 1126 mprio = TCP_PRIO_MAX;
mkersh3 0:e7ca326e76ee 1127
mkersh3 0:e7ca326e76ee 1128 /* We kill the oldest active connection that has lower priority than prio. */
mkersh3 0:e7ca326e76ee 1129 inactivity = 0;
mkersh3 0:e7ca326e76ee 1130 inactive = NULL;
mkersh3 0:e7ca326e76ee 1131 for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
mkersh3 0:e7ca326e76ee 1132 if (pcb->prio <= prio &&
mkersh3 0:e7ca326e76ee 1133 pcb->prio <= mprio &&
mkersh3 0:e7ca326e76ee 1134 (u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
mkersh3 0:e7ca326e76ee 1135 inactivity = tcp_ticks - pcb->tmr;
mkersh3 0:e7ca326e76ee 1136 inactive = pcb;
mkersh3 0:e7ca326e76ee 1137 mprio = pcb->prio;
mkersh3 0:e7ca326e76ee 1138 }
mkersh3 0:e7ca326e76ee 1139 }
mkersh3 0:e7ca326e76ee 1140 if (inactive != NULL) {
mkersh3 0:e7ca326e76ee 1141 LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n",
mkersh3 0:e7ca326e76ee 1142 (void *)inactive, inactivity));
mkersh3 0:e7ca326e76ee 1143 tcp_abort(inactive);
mkersh3 0:e7ca326e76ee 1144 }
mkersh3 0:e7ca326e76ee 1145 }
mkersh3 0:e7ca326e76ee 1146
mkersh3 0:e7ca326e76ee 1147 /**
mkersh3 0:e7ca326e76ee 1148 * Kills the oldest connection that is in TIME_WAIT state.
mkersh3 0:e7ca326e76ee 1149 * Called from tcp_alloc() if no more connections are available.
mkersh3 0:e7ca326e76ee 1150 */
mkersh3 0:e7ca326e76ee 1151 static void
mkersh3 0:e7ca326e76ee 1152 tcp_kill_timewait(void)
mkersh3 0:e7ca326e76ee 1153 {
mkersh3 0:e7ca326e76ee 1154 struct tcp_pcb *pcb, *inactive;
mkersh3 0:e7ca326e76ee 1155 u32_t inactivity;
mkersh3 0:e7ca326e76ee 1156
mkersh3 0:e7ca326e76ee 1157 inactivity = 0;
mkersh3 0:e7ca326e76ee 1158 inactive = NULL;
mkersh3 0:e7ca326e76ee 1159 /* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
mkersh3 0:e7ca326e76ee 1160 for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
mkersh3 0:e7ca326e76ee 1161 if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
mkersh3 0:e7ca326e76ee 1162 inactivity = tcp_ticks - pcb->tmr;
mkersh3 0:e7ca326e76ee 1163 inactive = pcb;
mkersh3 0:e7ca326e76ee 1164 }
mkersh3 0:e7ca326e76ee 1165 }
mkersh3 0:e7ca326e76ee 1166 if (inactive != NULL) {
mkersh3 0:e7ca326e76ee 1167 LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n",
mkersh3 0:e7ca326e76ee 1168 (void *)inactive, inactivity));
mkersh3 0:e7ca326e76ee 1169 tcp_abort(inactive);
mkersh3 0:e7ca326e76ee 1170 }
mkersh3 0:e7ca326e76ee 1171 }
mkersh3 0:e7ca326e76ee 1172
mkersh3 0:e7ca326e76ee 1173 /**
mkersh3 0:e7ca326e76ee 1174 * Allocate a new tcp_pcb structure.
mkersh3 0:e7ca326e76ee 1175 *
mkersh3 0:e7ca326e76ee 1176 * @param prio priority for the new pcb
mkersh3 0:e7ca326e76ee 1177 * @return a new tcp_pcb that initially is in state CLOSED
mkersh3 0:e7ca326e76ee 1178 */
mkersh3 0:e7ca326e76ee 1179 struct tcp_pcb *
mkersh3 0:e7ca326e76ee 1180 tcp_alloc(u8_t prio)
mkersh3 0:e7ca326e76ee 1181 {
mkersh3 0:e7ca326e76ee 1182 struct tcp_pcb *pcb;
mkersh3 0:e7ca326e76ee 1183 u32_t iss;
mkersh3 0:e7ca326e76ee 1184
mkersh3 0:e7ca326e76ee 1185 pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
mkersh3 0:e7ca326e76ee 1186 if (pcb == NULL) {
mkersh3 0:e7ca326e76ee 1187 /* Try killing oldest connection in TIME-WAIT. */
mkersh3 0:e7ca326e76ee 1188 LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
mkersh3 0:e7ca326e76ee 1189 tcp_kill_timewait();
mkersh3 0:e7ca326e76ee 1190 /* Try to allocate a tcp_pcb again. */
mkersh3 0:e7ca326e76ee 1191 pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
mkersh3 0:e7ca326e76ee 1192 if (pcb == NULL) {
mkersh3 0:e7ca326e76ee 1193 /* Try killing active connections with lower priority than the new one. */
mkersh3 0:e7ca326e76ee 1194 LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing connection with prio lower than %d\n", prio));
mkersh3 0:e7ca326e76ee 1195 tcp_kill_prio(prio);
mkersh3 0:e7ca326e76ee 1196 /* Try to allocate a tcp_pcb again. */
mkersh3 0:e7ca326e76ee 1197 pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
mkersh3 0:e7ca326e76ee 1198 if (pcb != NULL) {
mkersh3 0:e7ca326e76ee 1199 /* adjust err stats: memp_malloc failed twice before */
mkersh3 0:e7ca326e76ee 1200 MEMP_STATS_DEC(err, MEMP_TCP_PCB);
mkersh3 0:e7ca326e76ee 1201 }
mkersh3 0:e7ca326e76ee 1202 }
mkersh3 0:e7ca326e76ee 1203 if (pcb != NULL) {
mkersh3 0:e7ca326e76ee 1204 /* adjust err stats: timewait PCB was freed above */
mkersh3 0:e7ca326e76ee 1205 MEMP_STATS_DEC(err, MEMP_TCP_PCB);
mkersh3 0:e7ca326e76ee 1206 }
mkersh3 0:e7ca326e76ee 1207 }
mkersh3 0:e7ca326e76ee 1208 if (pcb != NULL) {
mkersh3 0:e7ca326e76ee 1209 memset(pcb, 0, sizeof(struct tcp_pcb));
mkersh3 0:e7ca326e76ee 1210 pcb->prio = prio;
mkersh3 0:e7ca326e76ee 1211 pcb->snd_buf = TCP_SND_BUF;
mkersh3 0:e7ca326e76ee 1212 pcb->snd_queuelen = 0;
mkersh3 0:e7ca326e76ee 1213 pcb->rcv_wnd = TCP_WND;
mkersh3 0:e7ca326e76ee 1214 pcb->rcv_ann_wnd = TCP_WND;
mkersh3 0:e7ca326e76ee 1215 pcb->tos = 0;
mkersh3 0:e7ca326e76ee 1216 pcb->ttl = TCP_TTL;
mkersh3 0:e7ca326e76ee 1217 /* As initial send MSS, we use TCP_MSS but limit it to 536.
mkersh3 0:e7ca326e76ee 1218 The send MSS is updated when an MSS option is received. */
mkersh3 0:e7ca326e76ee 1219 pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
mkersh3 0:e7ca326e76ee 1220 pcb->rto = 3000 / TCP_SLOW_INTERVAL;
mkersh3 0:e7ca326e76ee 1221 pcb->sa = 0;
mkersh3 0:e7ca326e76ee 1222 pcb->sv = 3000 / TCP_SLOW_INTERVAL;
mkersh3 0:e7ca326e76ee 1223 pcb->rtime = -1;
mkersh3 0:e7ca326e76ee 1224 pcb->cwnd = 1;
mkersh3 0:e7ca326e76ee 1225 iss = tcp_next_iss();
mkersh3 0:e7ca326e76ee 1226 pcb->snd_wl2 = iss;
mkersh3 0:e7ca326e76ee 1227 pcb->snd_nxt = iss;
mkersh3 0:e7ca326e76ee 1228 pcb->lastack = iss;
mkersh3 0:e7ca326e76ee 1229 pcb->snd_lbb = iss;
mkersh3 0:e7ca326e76ee 1230 pcb->tmr = tcp_ticks;
mkersh3 0:e7ca326e76ee 1231
mkersh3 0:e7ca326e76ee 1232 pcb->polltmr = 0;
mkersh3 0:e7ca326e76ee 1233
mkersh3 0:e7ca326e76ee 1234 #if LWIP_CALLBACK_API
mkersh3 0:e7ca326e76ee 1235 pcb->recv = tcp_recv_null;
mkersh3 0:e7ca326e76ee 1236 #endif /* LWIP_CALLBACK_API */
mkersh3 0:e7ca326e76ee 1237
mkersh3 0:e7ca326e76ee 1238 /* Init KEEPALIVE timer */
mkersh3 0:e7ca326e76ee 1239 pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
mkersh3 0:e7ca326e76ee 1240
mkersh3 0:e7ca326e76ee 1241 #if LWIP_TCP_KEEPALIVE
mkersh3 0:e7ca326e76ee 1242 pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
mkersh3 0:e7ca326e76ee 1243 pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
mkersh3 0:e7ca326e76ee 1244 #endif /* LWIP_TCP_KEEPALIVE */
mkersh3 0:e7ca326e76ee 1245
mkersh3 0:e7ca326e76ee 1246 pcb->keep_cnt_sent = 0;
mkersh3 0:e7ca326e76ee 1247 }
mkersh3 0:e7ca326e76ee 1248 return pcb;
mkersh3 0:e7ca326e76ee 1249 }
mkersh3 0:e7ca326e76ee 1250
mkersh3 0:e7ca326e76ee 1251 /**
mkersh3 0:e7ca326e76ee 1252 * Creates a new TCP protocol control block but doesn't place it on
mkersh3 0:e7ca326e76ee 1253 * any of the TCP PCB lists.
mkersh3 0:e7ca326e76ee 1254 * The pcb is not put on any list until binding using tcp_bind().
mkersh3 0:e7ca326e76ee 1255 *
mkersh3 0:e7ca326e76ee 1256 * @internal: Maybe there should be a idle TCP PCB list where these
mkersh3 0:e7ca326e76ee 1257 * PCBs are put on. Port reservation using tcp_bind() is implemented but
mkersh3 0:e7ca326e76ee 1258 * allocated pcbs that are not bound can't be killed automatically if wanting
mkersh3 0:e7ca326e76ee 1259 * to allocate a pcb with higher prio (@see tcp_kill_prio())
mkersh3 0:e7ca326e76ee 1260 *
mkersh3 0:e7ca326e76ee 1261 * @return a new tcp_pcb that initially is in state CLOSED
mkersh3 0:e7ca326e76ee 1262 */
mkersh3 0:e7ca326e76ee 1263 struct tcp_pcb *
mkersh3 0:e7ca326e76ee 1264 tcp_new(void)
mkersh3 0:e7ca326e76ee 1265 {
mkersh3 0:e7ca326e76ee 1266 return tcp_alloc(TCP_PRIO_NORMAL);
mkersh3 0:e7ca326e76ee 1267 }
mkersh3 0:e7ca326e76ee 1268
mkersh3 0:e7ca326e76ee 1269 /**
mkersh3 0:e7ca326e76ee 1270 * Used to specify the argument that should be passed callback
mkersh3 0:e7ca326e76ee 1271 * functions.
mkersh3 0:e7ca326e76ee 1272 *
mkersh3 0:e7ca326e76ee 1273 * @param pcb tcp_pcb to set the callback argument
mkersh3 0:e7ca326e76ee 1274 * @param arg void pointer argument to pass to callback functions
mkersh3 0:e7ca326e76ee 1275 */
mkersh3 0:e7ca326e76ee 1276 void
mkersh3 0:e7ca326e76ee 1277 tcp_arg(struct tcp_pcb *pcb, void *arg)
mkersh3 0:e7ca326e76ee 1278 {
mkersh3 0:e7ca326e76ee 1279 pcb->callback_arg = arg;
mkersh3 0:e7ca326e76ee 1280 }
mkersh3 0:e7ca326e76ee 1281 #if LWIP_CALLBACK_API
mkersh3 0:e7ca326e76ee 1282
mkersh3 0:e7ca326e76ee 1283 /**
mkersh3 0:e7ca326e76ee 1284 * Used to specify the function that should be called when a TCP
mkersh3 0:e7ca326e76ee 1285 * connection receives data.
mkersh3 0:e7ca326e76ee 1286 *
mkersh3 0:e7ca326e76ee 1287 * @param pcb tcp_pcb to set the recv callback
mkersh3 0:e7ca326e76ee 1288 * @param recv callback function to call for this pcb when data is received
mkersh3 0:e7ca326e76ee 1289 */
mkersh3 0:e7ca326e76ee 1290 void
mkersh3 0:e7ca326e76ee 1291 tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
mkersh3 0:e7ca326e76ee 1292 {
mkersh3 0:e7ca326e76ee 1293 pcb->recv = recv;
mkersh3 0:e7ca326e76ee 1294 }
mkersh3 0:e7ca326e76ee 1295
mkersh3 0:e7ca326e76ee 1296 /**
mkersh3 0:e7ca326e76ee 1297 * Used to specify the function that should be called when TCP data
mkersh3 0:e7ca326e76ee 1298 * has been successfully delivered to the remote host.
mkersh3 0:e7ca326e76ee 1299 *
mkersh3 0:e7ca326e76ee 1300 * @param pcb tcp_pcb to set the sent callback
mkersh3 0:e7ca326e76ee 1301 * @param sent callback function to call for this pcb when data is successfully sent
mkersh3 0:e7ca326e76ee 1302 */
mkersh3 0:e7ca326e76ee 1303 void
mkersh3 0:e7ca326e76ee 1304 tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
mkersh3 0:e7ca326e76ee 1305 {
mkersh3 0:e7ca326e76ee 1306 pcb->sent = sent;
mkersh3 0:e7ca326e76ee 1307 }
mkersh3 0:e7ca326e76ee 1308
mkersh3 0:e7ca326e76ee 1309 /**
mkersh3 0:e7ca326e76ee 1310 * Used to specify the function that should be called when a fatal error
mkersh3 0:e7ca326e76ee 1311 * has occured on the connection.
mkersh3 0:e7ca326e76ee 1312 *
mkersh3 0:e7ca326e76ee 1313 * @param pcb tcp_pcb to set the err callback
mkersh3 0:e7ca326e76ee 1314 * @param err callback function to call for this pcb when a fatal error
mkersh3 0:e7ca326e76ee 1315 * has occured on the connection
mkersh3 0:e7ca326e76ee 1316 */
mkersh3 0:e7ca326e76ee 1317 void
mkersh3 0:e7ca326e76ee 1318 tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
mkersh3 0:e7ca326e76ee 1319 {
mkersh3 0:e7ca326e76ee 1320 pcb->errf = err;
mkersh3 0:e7ca326e76ee 1321 }
mkersh3 0:e7ca326e76ee 1322
mkersh3 0:e7ca326e76ee 1323 /**
mkersh3 0:e7ca326e76ee 1324 * Used for specifying the function that should be called when a
mkersh3 0:e7ca326e76ee 1325 * LISTENing connection has been connected to another host.
mkersh3 0:e7ca326e76ee 1326 *
mkersh3 0:e7ca326e76ee 1327 * @param pcb tcp_pcb to set the accept callback
mkersh3 0:e7ca326e76ee 1328 * @param accept callback function to call for this pcb when LISTENing
mkersh3 0:e7ca326e76ee 1329 * connection has been connected to another host
mkersh3 0:e7ca326e76ee 1330 */
mkersh3 0:e7ca326e76ee 1331 void
mkersh3 0:e7ca326e76ee 1332 tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
mkersh3 0:e7ca326e76ee 1333 {
mkersh3 0:e7ca326e76ee 1334 pcb->accept = accept;
mkersh3 0:e7ca326e76ee 1335 }
mkersh3 0:e7ca326e76ee 1336 #endif /* LWIP_CALLBACK_API */
mkersh3 0:e7ca326e76ee 1337
mkersh3 0:e7ca326e76ee 1338
mkersh3 0:e7ca326e76ee 1339 /**
mkersh3 0:e7ca326e76ee 1340 * Used to specify the function that should be called periodically
mkersh3 0:e7ca326e76ee 1341 * from TCP. The interval is specified in terms of the TCP coarse
mkersh3 0:e7ca326e76ee 1342 * timer interval, which is called twice a second.
mkersh3 0:e7ca326e76ee 1343 *
mkersh3 0:e7ca326e76ee 1344 */
mkersh3 0:e7ca326e76ee 1345 void
mkersh3 0:e7ca326e76ee 1346 tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
mkersh3 0:e7ca326e76ee 1347 {
mkersh3 0:e7ca326e76ee 1348 #if LWIP_CALLBACK_API
mkersh3 0:e7ca326e76ee 1349 pcb->poll = poll;
mkersh3 0:e7ca326e76ee 1350 #else /* LWIP_CALLBACK_API */
mkersh3 0:e7ca326e76ee 1351 LWIP_UNUSED_ARG(poll);
mkersh3 0:e7ca326e76ee 1352 #endif /* LWIP_CALLBACK_API */
mkersh3 0:e7ca326e76ee 1353 pcb->pollinterval = interval;
mkersh3 0:e7ca326e76ee 1354 }
mkersh3 0:e7ca326e76ee 1355
mkersh3 0:e7ca326e76ee 1356 /**
mkersh3 0:e7ca326e76ee 1357 * Purges a TCP PCB. Removes any buffered data and frees the buffer memory
mkersh3 0:e7ca326e76ee 1358 * (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
mkersh3 0:e7ca326e76ee 1359 *
mkersh3 0:e7ca326e76ee 1360 * @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
mkersh3 0:e7ca326e76ee 1361 */
mkersh3 0:e7ca326e76ee 1362 void
mkersh3 0:e7ca326e76ee 1363 tcp_pcb_purge(struct tcp_pcb *pcb)
mkersh3 0:e7ca326e76ee 1364 {
mkersh3 0:e7ca326e76ee 1365 if (pcb->state != CLOSED &&
mkersh3 0:e7ca326e76ee 1366 pcb->state != TIME_WAIT &&
mkersh3 0:e7ca326e76ee 1367 pcb->state != LISTEN) {
mkersh3 0:e7ca326e76ee 1368
mkersh3 0:e7ca326e76ee 1369 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
mkersh3 0:e7ca326e76ee 1370
mkersh3 0:e7ca326e76ee 1371 #if TCP_LISTEN_BACKLOG
mkersh3 0:e7ca326e76ee 1372 if (pcb->state == SYN_RCVD) {
mkersh3 0:e7ca326e76ee 1373 /* Need to find the corresponding listen_pcb and decrease its accepts_pending */
mkersh3 0:e7ca326e76ee 1374 struct tcp_pcb_listen *lpcb;
mkersh3 0:e7ca326e76ee 1375 LWIP_ASSERT("tcp_pcb_purge: pcb->state == SYN_RCVD but tcp_listen_pcbs is NULL",
mkersh3 0:e7ca326e76ee 1376 tcp_listen_pcbs.listen_pcbs != NULL);
mkersh3 0:e7ca326e76ee 1377 for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
mkersh3 0:e7ca326e76ee 1378 if ((lpcb->local_port == pcb->local_port) &&
mkersh3 0:e7ca326e76ee 1379 (ip_addr_isany(&lpcb->local_ip) ||
mkersh3 0:e7ca326e76ee 1380 ip_addr_cmp(&pcb->local_ip, &lpcb->local_ip))) {
mkersh3 0:e7ca326e76ee 1381 /* port and address of the listen pcb match the timed-out pcb */
mkersh3 0:e7ca326e76ee 1382 LWIP_ASSERT("tcp_pcb_purge: listen pcb does not have accepts pending",
mkersh3 0:e7ca326e76ee 1383 lpcb->accepts_pending > 0);
mkersh3 0:e7ca326e76ee 1384 lpcb->accepts_pending--;
mkersh3 0:e7ca326e76ee 1385 break;
mkersh3 0:e7ca326e76ee 1386 }
mkersh3 0:e7ca326e76ee 1387 }
mkersh3 0:e7ca326e76ee 1388 }
mkersh3 0:e7ca326e76ee 1389 #endif /* TCP_LISTEN_BACKLOG */
mkersh3 0:e7ca326e76ee 1390
mkersh3 0:e7ca326e76ee 1391
mkersh3 0:e7ca326e76ee 1392 if (pcb->refused_data != NULL) {
mkersh3 0:e7ca326e76ee 1393 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
mkersh3 0:e7ca326e76ee 1394 pbuf_free(pcb->refused_data);
mkersh3 0:e7ca326e76ee 1395 pcb->refused_data = NULL;
mkersh3 0:e7ca326e76ee 1396 }
mkersh3 0:e7ca326e76ee 1397 if (pcb->unsent != NULL) {
mkersh3 0:e7ca326e76ee 1398 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
mkersh3 0:e7ca326e76ee 1399 }
mkersh3 0:e7ca326e76ee 1400 if (pcb->unacked != NULL) {
mkersh3 0:e7ca326e76ee 1401 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
mkersh3 0:e7ca326e76ee 1402 }
mkersh3 0:e7ca326e76ee 1403 #if TCP_QUEUE_OOSEQ
mkersh3 0:e7ca326e76ee 1404 if (pcb->ooseq != NULL) {
mkersh3 0:e7ca326e76ee 1405 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
mkersh3 0:e7ca326e76ee 1406 }
mkersh3 0:e7ca326e76ee 1407 tcp_segs_free(pcb->ooseq);
mkersh3 0:e7ca326e76ee 1408 pcb->ooseq = NULL;
mkersh3 0:e7ca326e76ee 1409 #endif /* TCP_QUEUE_OOSEQ */
mkersh3 0:e7ca326e76ee 1410
mkersh3 0:e7ca326e76ee 1411 /* Stop the retransmission timer as it will expect data on unacked
mkersh3 0:e7ca326e76ee 1412 queue if it fires */
mkersh3 0:e7ca326e76ee 1413 pcb->rtime = -1;
mkersh3 0:e7ca326e76ee 1414
mkersh3 0:e7ca326e76ee 1415 tcp_segs_free(pcb->unsent);
mkersh3 0:e7ca326e76ee 1416 tcp_segs_free(pcb->unacked);
mkersh3 0:e7ca326e76ee 1417 pcb->unacked = pcb->unsent = NULL;
mkersh3 0:e7ca326e76ee 1418 #if TCP_OVERSIZE
mkersh3 0:e7ca326e76ee 1419 pcb->unsent_oversize = 0;
mkersh3 0:e7ca326e76ee 1420 #endif /* TCP_OVERSIZE */
mkersh3 0:e7ca326e76ee 1421 }
mkersh3 0:e7ca326e76ee 1422 }
mkersh3 0:e7ca326e76ee 1423
mkersh3 0:e7ca326e76ee 1424 /**
mkersh3 0:e7ca326e76ee 1425 * Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
mkersh3 0:e7ca326e76ee 1426 *
mkersh3 0:e7ca326e76ee 1427 * @param pcblist PCB list to purge.
mkersh3 0:e7ca326e76ee 1428 * @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
mkersh3 0:e7ca326e76ee 1429 */
mkersh3 0:e7ca326e76ee 1430 void
mkersh3 0:e7ca326e76ee 1431 tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb)
mkersh3 0:e7ca326e76ee 1432 {
mkersh3 0:e7ca326e76ee 1433 TCP_RMV(pcblist, pcb);
mkersh3 0:e7ca326e76ee 1434
mkersh3 0:e7ca326e76ee 1435 tcp_pcb_purge(pcb);
mkersh3 0:e7ca326e76ee 1436
mkersh3 0:e7ca326e76ee 1437 /* if there is an outstanding delayed ACKs, send it */
mkersh3 0:e7ca326e76ee 1438 if (pcb->state != TIME_WAIT &&
mkersh3 0:e7ca326e76ee 1439 pcb->state != LISTEN &&
mkersh3 0:e7ca326e76ee 1440 pcb->flags & TF_ACK_DELAY) {
mkersh3 0:e7ca326e76ee 1441 pcb->flags |= TF_ACK_NOW;
mkersh3 0:e7ca326e76ee 1442 tcp_output(pcb);
mkersh3 0:e7ca326e76ee 1443 }
mkersh3 0:e7ca326e76ee 1444
mkersh3 0:e7ca326e76ee 1445 if (pcb->state != LISTEN) {
mkersh3 0:e7ca326e76ee 1446 LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
mkersh3 0:e7ca326e76ee 1447 LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
mkersh3 0:e7ca326e76ee 1448 #if TCP_QUEUE_OOSEQ
mkersh3 0:e7ca326e76ee 1449 LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
mkersh3 0:e7ca326e76ee 1450 #endif /* TCP_QUEUE_OOSEQ */
mkersh3 0:e7ca326e76ee 1451 }
mkersh3 0:e7ca326e76ee 1452
mkersh3 0:e7ca326e76ee 1453 pcb->state = CLOSED;
mkersh3 0:e7ca326e76ee 1454
mkersh3 0:e7ca326e76ee 1455 LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
mkersh3 0:e7ca326e76ee 1456 }
mkersh3 0:e7ca326e76ee 1457
mkersh3 0:e7ca326e76ee 1458 /**
mkersh3 0:e7ca326e76ee 1459 * Calculates a new initial sequence number for new connections.
mkersh3 0:e7ca326e76ee 1460 *
mkersh3 0:e7ca326e76ee 1461 * @return u32_t pseudo random sequence number
mkersh3 0:e7ca326e76ee 1462 */
mkersh3 0:e7ca326e76ee 1463 u32_t
mkersh3 0:e7ca326e76ee 1464 tcp_next_iss(void)
mkersh3 0:e7ca326e76ee 1465 {
mkersh3 0:e7ca326e76ee 1466 static u32_t iss = 6510;
mkersh3 0:e7ca326e76ee 1467
mkersh3 0:e7ca326e76ee 1468 iss += tcp_ticks; /* XXX */
mkersh3 0:e7ca326e76ee 1469 return iss;
mkersh3 0:e7ca326e76ee 1470 }
mkersh3 0:e7ca326e76ee 1471
mkersh3 0:e7ca326e76ee 1472 #if TCP_CALCULATE_EFF_SEND_MSS
mkersh3 0:e7ca326e76ee 1473 /**
mkersh3 0:e7ca326e76ee 1474 * Calcluates the effective send mss that can be used for a specific IP address
mkersh3 0:e7ca326e76ee 1475 * by using ip_route to determin the netif used to send to the address and
mkersh3 0:e7ca326e76ee 1476 * calculating the minimum of TCP_MSS and that netif's mtu (if set).
mkersh3 0:e7ca326e76ee 1477 */
mkersh3 0:e7ca326e76ee 1478 u16_t
mkersh3 0:e7ca326e76ee 1479 tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr)
mkersh3 0:e7ca326e76ee 1480 {
mkersh3 0:e7ca326e76ee 1481 u16_t mss_s;
mkersh3 0:e7ca326e76ee 1482 struct netif *outif;
mkersh3 0:e7ca326e76ee 1483
mkersh3 0:e7ca326e76ee 1484 outif = ip_route(addr);
mkersh3 0:e7ca326e76ee 1485 if ((outif != NULL) && (outif->mtu != 0)) {
mkersh3 0:e7ca326e76ee 1486 mss_s = outif->mtu - IP_HLEN - TCP_HLEN;
mkersh3 0:e7ca326e76ee 1487 /* RFC 1122, chap 4.2.2.6:
mkersh3 0:e7ca326e76ee 1488 * Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
mkersh3 0:e7ca326e76ee 1489 * We correct for TCP options in tcp_write(), and don't support IP options.
mkersh3 0:e7ca326e76ee 1490 */
mkersh3 0:e7ca326e76ee 1491 sendmss = LWIP_MIN(sendmss, mss_s);
mkersh3 0:e7ca326e76ee 1492 }
mkersh3 0:e7ca326e76ee 1493 return sendmss;
mkersh3 0:e7ca326e76ee 1494 }
mkersh3 0:e7ca326e76ee 1495 #endif /* TCP_CALCULATE_EFF_SEND_MSS */
mkersh3 0:e7ca326e76ee 1496
mkersh3 0:e7ca326e76ee 1497 const char*
mkersh3 0:e7ca326e76ee 1498 tcp_debug_state_str(enum tcp_state s)
mkersh3 0:e7ca326e76ee 1499 {
mkersh3 0:e7ca326e76ee 1500 return tcp_state_str[s];
mkersh3 0:e7ca326e76ee 1501 }
mkersh3 0:e7ca326e76ee 1502
mkersh3 0:e7ca326e76ee 1503 #if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
mkersh3 0:e7ca326e76ee 1504 /**
mkersh3 0:e7ca326e76ee 1505 * Print a tcp header for debugging purposes.
mkersh3 0:e7ca326e76ee 1506 *
mkersh3 0:e7ca326e76ee 1507 * @param tcphdr pointer to a struct tcp_hdr
mkersh3 0:e7ca326e76ee 1508 */
mkersh3 0:e7ca326e76ee 1509 void
mkersh3 0:e7ca326e76ee 1510 tcp_debug_print(struct tcp_hdr *tcphdr)
mkersh3 0:e7ca326e76ee 1511 {
mkersh3 0:e7ca326e76ee 1512 LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
mkersh3 0:e7ca326e76ee 1513 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mkersh3 0:e7ca326e76ee 1514 LWIP_DEBUGF(TCP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
mkersh3 0:e7ca326e76ee 1515 ntohs(tcphdr->src), ntohs(tcphdr->dest)));
mkersh3 0:e7ca326e76ee 1516 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mkersh3 0:e7ca326e76ee 1517 LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (seq no)\n",
mkersh3 0:e7ca326e76ee 1518 ntohl(tcphdr->seqno)));
mkersh3 0:e7ca326e76ee 1519 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mkersh3 0:e7ca326e76ee 1520 LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (ack no)\n",
mkersh3 0:e7ca326e76ee 1521 ntohl(tcphdr->ackno)));
mkersh3 0:e7ca326e76ee 1522 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mkersh3 0:e7ca326e76ee 1523 LWIP_DEBUGF(TCP_DEBUG, ("| %2"U16_F" | |%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"| %5"U16_F" | (hdrlen, flags (",
mkersh3 0:e7ca326e76ee 1524 TCPH_HDRLEN(tcphdr),
mkersh3 0:e7ca326e76ee 1525 TCPH_FLAGS(tcphdr) >> 5 & 1,
mkersh3 0:e7ca326e76ee 1526 TCPH_FLAGS(tcphdr) >> 4 & 1,
mkersh3 0:e7ca326e76ee 1527 TCPH_FLAGS(tcphdr) >> 3 & 1,
mkersh3 0:e7ca326e76ee 1528 TCPH_FLAGS(tcphdr) >> 2 & 1,
mkersh3 0:e7ca326e76ee 1529 TCPH_FLAGS(tcphdr) >> 1 & 1,
mkersh3 0:e7ca326e76ee 1530 TCPH_FLAGS(tcphdr) & 1,
mkersh3 0:e7ca326e76ee 1531 ntohs(tcphdr->wnd)));
mkersh3 0:e7ca326e76ee 1532 tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
mkersh3 0:e7ca326e76ee 1533 LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
mkersh3 0:e7ca326e76ee 1534 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mkersh3 0:e7ca326e76ee 1535 LWIP_DEBUGF(TCP_DEBUG, ("| 0x%04"X16_F" | %5"U16_F" | (chksum, urgp)\n",
mkersh3 0:e7ca326e76ee 1536 ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
mkersh3 0:e7ca326e76ee 1537 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
mkersh3 0:e7ca326e76ee 1538 }
mkersh3 0:e7ca326e76ee 1539
mkersh3 0:e7ca326e76ee 1540 /**
mkersh3 0:e7ca326e76ee 1541 * Print a tcp state for debugging purposes.
mkersh3 0:e7ca326e76ee 1542 *
mkersh3 0:e7ca326e76ee 1543 * @param s enum tcp_state to print
mkersh3 0:e7ca326e76ee 1544 */
mkersh3 0:e7ca326e76ee 1545 void
mkersh3 0:e7ca326e76ee 1546 tcp_debug_print_state(enum tcp_state s)
mkersh3 0:e7ca326e76ee 1547 {
mkersh3 0:e7ca326e76ee 1548 LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
mkersh3 0:e7ca326e76ee 1549 }
mkersh3 0:e7ca326e76ee 1550
mkersh3 0:e7ca326e76ee 1551 /**
mkersh3 0:e7ca326e76ee 1552 * Print tcp flags for debugging purposes.
mkersh3 0:e7ca326e76ee 1553 *
mkersh3 0:e7ca326e76ee 1554 * @param flags tcp flags, all active flags are printed
mkersh3 0:e7ca326e76ee 1555 */
mkersh3 0:e7ca326e76ee 1556 void
mkersh3 0:e7ca326e76ee 1557 tcp_debug_print_flags(u8_t flags)
mkersh3 0:e7ca326e76ee 1558 {
mkersh3 0:e7ca326e76ee 1559 if (flags & TCP_FIN) {
mkersh3 0:e7ca326e76ee 1560 LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
mkersh3 0:e7ca326e76ee 1561 }
mkersh3 0:e7ca326e76ee 1562 if (flags & TCP_SYN) {
mkersh3 0:e7ca326e76ee 1563 LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
mkersh3 0:e7ca326e76ee 1564 }
mkersh3 0:e7ca326e76ee 1565 if (flags & TCP_RST) {
mkersh3 0:e7ca326e76ee 1566 LWIP_DEBUGF(TCP_DEBUG, ("RST "));
mkersh3 0:e7ca326e76ee 1567 }
mkersh3 0:e7ca326e76ee 1568 if (flags & TCP_PSH) {
mkersh3 0:e7ca326e76ee 1569 LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
mkersh3 0:e7ca326e76ee 1570 }
mkersh3 0:e7ca326e76ee 1571 if (flags & TCP_ACK) {
mkersh3 0:e7ca326e76ee 1572 LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
mkersh3 0:e7ca326e76ee 1573 }
mkersh3 0:e7ca326e76ee 1574 if (flags & TCP_URG) {
mkersh3 0:e7ca326e76ee 1575 LWIP_DEBUGF(TCP_DEBUG, ("URG "));
mkersh3 0:e7ca326e76ee 1576 }
mkersh3 0:e7ca326e76ee 1577 if (flags & TCP_ECE) {
mkersh3 0:e7ca326e76ee 1578 LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
mkersh3 0:e7ca326e76ee 1579 }
mkersh3 0:e7ca326e76ee 1580 if (flags & TCP_CWR) {
mkersh3 0:e7ca326e76ee 1581 LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
mkersh3 0:e7ca326e76ee 1582 }
mkersh3 0:e7ca326e76ee 1583 LWIP_DEBUGF(TCP_DEBUG, ("\n"));
mkersh3 0:e7ca326e76ee 1584 }
mkersh3 0:e7ca326e76ee 1585
mkersh3 0:e7ca326e76ee 1586 /**
mkersh3 0:e7ca326e76ee 1587 * Print all tcp_pcbs in every list for debugging purposes.
mkersh3 0:e7ca326e76ee 1588 */
mkersh3 0:e7ca326e76ee 1589 void
mkersh3 0:e7ca326e76ee 1590 tcp_debug_print_pcbs(void)
mkersh3 0:e7ca326e76ee 1591 {
mkersh3 0:e7ca326e76ee 1592 struct tcp_pcb *pcb;
mkersh3 0:e7ca326e76ee 1593 LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
mkersh3 0:e7ca326e76ee 1594 for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
mkersh3 0:e7ca326e76ee 1595 LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
mkersh3 0:e7ca326e76ee 1596 pcb->local_port, pcb->remote_port,
mkersh3 0:e7ca326e76ee 1597 pcb->snd_nxt, pcb->rcv_nxt));
mkersh3 0:e7ca326e76ee 1598 tcp_debug_print_state(pcb->state);
mkersh3 0:e7ca326e76ee 1599 }
mkersh3 0:e7ca326e76ee 1600 LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
mkersh3 0:e7ca326e76ee 1601 for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
mkersh3 0:e7ca326e76ee 1602 LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
mkersh3 0:e7ca326e76ee 1603 pcb->local_port, pcb->remote_port,
mkersh3 0:e7ca326e76ee 1604 pcb->snd_nxt, pcb->rcv_nxt));
mkersh3 0:e7ca326e76ee 1605 tcp_debug_print_state(pcb->state);
mkersh3 0:e7ca326e76ee 1606 }
mkersh3 0:e7ca326e76ee 1607 LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
mkersh3 0:e7ca326e76ee 1608 for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
mkersh3 0:e7ca326e76ee 1609 LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
mkersh3 0:e7ca326e76ee 1610 pcb->local_port, pcb->remote_port,
mkersh3 0:e7ca326e76ee 1611 pcb->snd_nxt, pcb->rcv_nxt));
mkersh3 0:e7ca326e76ee 1612 tcp_debug_print_state(pcb->state);
mkersh3 0:e7ca326e76ee 1613 }
mkersh3 0:e7ca326e76ee 1614 }
mkersh3 0:e7ca326e76ee 1615
mkersh3 0:e7ca326e76ee 1616 /**
mkersh3 0:e7ca326e76ee 1617 * Check state consistency of the tcp_pcb lists.
mkersh3 0:e7ca326e76ee 1618 */
mkersh3 0:e7ca326e76ee 1619 s16_t
mkersh3 0:e7ca326e76ee 1620 tcp_pcbs_sane(void)
mkersh3 0:e7ca326e76ee 1621 {
mkersh3 0:e7ca326e76ee 1622 struct tcp_pcb *pcb;
mkersh3 0:e7ca326e76ee 1623 for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
mkersh3 0:e7ca326e76ee 1624 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
mkersh3 0:e7ca326e76ee 1625 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
mkersh3 0:e7ca326e76ee 1626 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
mkersh3 0:e7ca326e76ee 1627 }
mkersh3 0:e7ca326e76ee 1628 for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
mkersh3 0:e7ca326e76ee 1629 LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
mkersh3 0:e7ca326e76ee 1630 }
mkersh3 0:e7ca326e76ee 1631 return 1;
mkersh3 0:e7ca326e76ee 1632 }
mkersh3 0:e7ca326e76ee 1633 #endif /* TCP_DEBUG */
mkersh3 0:e7ca326e76ee 1634
mkersh3 0:e7ca326e76ee 1635 #endif /* LWIP_TCP */