Nino Der Kinderen / Mbed 2 deprecated InetTest

Embedded C project:18/12/2014

Dependencies:   DS1307 TextLCD mbed

NetServices/lwip/core/tcp.c@0:8d87bc453349, 2014-12-18 (annotated)

Committer:
ninoderkinderen
Date:
Thu Dec 18 09:35:49 2014 +0000
Revision:
0:8d87bc453349
Programma embedded C

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ninoderkinderen 0:8d87bc453349 1 /**
ninoderkinderen 0:8d87bc453349 2 * @file
ninoderkinderen 0:8d87bc453349 3 * Transmission Control Protocol for IP
ninoderkinderen 0:8d87bc453349 4 *
ninoderkinderen 0:8d87bc453349 5 * This file contains common functions for the TCP implementation, such as functinos
ninoderkinderen 0:8d87bc453349 6 * for manipulating the data structures and the TCP timer functions. TCP functions
ninoderkinderen 0:8d87bc453349 7 * related to input and output is found in tcp_in.c and tcp_out.c respectively.
ninoderkinderen 0:8d87bc453349 8 *
ninoderkinderen 0:8d87bc453349 9 */
ninoderkinderen 0:8d87bc453349 10
ninoderkinderen 0:8d87bc453349 11 /*
ninoderkinderen 0:8d87bc453349 12 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
ninoderkinderen 0:8d87bc453349 13 * All rights reserved.
ninoderkinderen 0:8d87bc453349 14 *
ninoderkinderen 0:8d87bc453349 15 * Redistribution and use in source and binary forms, with or without modification,
ninoderkinderen 0:8d87bc453349 16 * are permitted provided that the following conditions are met:
ninoderkinderen 0:8d87bc453349 17 *
ninoderkinderen 0:8d87bc453349 18 * 1. Redistributions of source code must retain the above copyright notice,
ninoderkinderen 0:8d87bc453349 19 * this list of conditions and the following disclaimer.
ninoderkinderen 0:8d87bc453349 20 * 2. Redistributions in binary form must reproduce the above copyright notice,
ninoderkinderen 0:8d87bc453349 21 * this list of conditions and the following disclaimer in the documentation
ninoderkinderen 0:8d87bc453349 22 * and/or other materials provided with the distribution.
ninoderkinderen 0:8d87bc453349 23 * 3. The name of the author may not be used to endorse or promote products
ninoderkinderen 0:8d87bc453349 24 * derived from this software without specific prior written permission.
ninoderkinderen 0:8d87bc453349 25 *
ninoderkinderen 0:8d87bc453349 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
ninoderkinderen 0:8d87bc453349 27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
ninoderkinderen 0:8d87bc453349 28 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
ninoderkinderen 0:8d87bc453349 29 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
ninoderkinderen 0:8d87bc453349 30 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
ninoderkinderen 0:8d87bc453349 31 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
ninoderkinderen 0:8d87bc453349 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
ninoderkinderen 0:8d87bc453349 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
ninoderkinderen 0:8d87bc453349 34 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
ninoderkinderen 0:8d87bc453349 35 * OF SUCH DAMAGE.
ninoderkinderen 0:8d87bc453349 36 *
ninoderkinderen 0:8d87bc453349 37 * This file is part of the lwIP TCP/IP stack.
ninoderkinderen 0:8d87bc453349 38 *
ninoderkinderen 0:8d87bc453349 39 * Author: Adam Dunkels <adam@sics.se>
ninoderkinderen 0:8d87bc453349 40 *
ninoderkinderen 0:8d87bc453349 41 */
ninoderkinderen 0:8d87bc453349 42
ninoderkinderen 0:8d87bc453349 43 #include "lwip/opt.h"
ninoderkinderen 0:8d87bc453349 44
ninoderkinderen 0:8d87bc453349 45 #if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
ninoderkinderen 0:8d87bc453349 46
ninoderkinderen 0:8d87bc453349 47 #include "lwip/def.h"
ninoderkinderen 0:8d87bc453349 48 #include "lwip/mem.h"
ninoderkinderen 0:8d87bc453349 49 #include "lwip/memp.h"
ninoderkinderen 0:8d87bc453349 50 #include "lwip/snmp.h"
ninoderkinderen 0:8d87bc453349 51 #include "lwip/tcp.h"
ninoderkinderen 0:8d87bc453349 52 #include "lwip/tcp_impl.h"
ninoderkinderen 0:8d87bc453349 53 #include "lwip/debug.h"
ninoderkinderen 0:8d87bc453349 54 #include "lwip/stats.h"
ninoderkinderen 0:8d87bc453349 55
ninoderkinderen 0:8d87bc453349 56 #include <string.h>
ninoderkinderen 0:8d87bc453349 57
ninoderkinderen 0:8d87bc453349 58 const char * const tcp_state_str[] = {
ninoderkinderen 0:8d87bc453349 59 "CLOSED",
ninoderkinderen 0:8d87bc453349 60 "LISTEN",
ninoderkinderen 0:8d87bc453349 61 "SYN_SENT",
ninoderkinderen 0:8d87bc453349 62 "SYN_RCVD",
ninoderkinderen 0:8d87bc453349 63 "ESTABLISHED",
ninoderkinderen 0:8d87bc453349 64 "FIN_WAIT_1",
ninoderkinderen 0:8d87bc453349 65 "FIN_WAIT_2",
ninoderkinderen 0:8d87bc453349 66 "CLOSE_WAIT",
ninoderkinderen 0:8d87bc453349 67 "CLOSING",
ninoderkinderen 0:8d87bc453349 68 "LAST_ACK",
ninoderkinderen 0:8d87bc453349 69 "TIME_WAIT"
ninoderkinderen 0:8d87bc453349 70 };
ninoderkinderen 0:8d87bc453349 71
ninoderkinderen 0:8d87bc453349 72 /* Incremented every coarse grained timer shot (typically every 500 ms). */
ninoderkinderen 0:8d87bc453349 73 u32_t tcp_ticks;
ninoderkinderen 0:8d87bc453349 74 const u8_t tcp_backoff[13] =
ninoderkinderen 0:8d87bc453349 75 { 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
ninoderkinderen 0:8d87bc453349 76 /* Times per slowtmr hits */
ninoderkinderen 0:8d87bc453349 77 const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
ninoderkinderen 0:8d87bc453349 78
ninoderkinderen 0:8d87bc453349 79 /* The TCP PCB lists. */
ninoderkinderen 0:8d87bc453349 80
ninoderkinderen 0:8d87bc453349 81 /** List of all TCP PCBs bound but not yet (connected || listening) */
ninoderkinderen 0:8d87bc453349 82 struct tcp_pcb *tcp_bound_pcbs;
ninoderkinderen 0:8d87bc453349 83 /** List of all TCP PCBs in LISTEN state */
ninoderkinderen 0:8d87bc453349 84 union tcp_listen_pcbs_t tcp_listen_pcbs;
ninoderkinderen 0:8d87bc453349 85 /** List of all TCP PCBs that are in a state in which
ninoderkinderen 0:8d87bc453349 86 * they accept or send data. */
ninoderkinderen 0:8d87bc453349 87 struct tcp_pcb *tcp_active_pcbs;
ninoderkinderen 0:8d87bc453349 88 /** List of all TCP PCBs in TIME-WAIT state */
ninoderkinderen 0:8d87bc453349 89 struct tcp_pcb *tcp_tw_pcbs;
ninoderkinderen 0:8d87bc453349 90
ninoderkinderen 0:8d87bc453349 91 #define NUM_TCP_PCB_LISTS 4
ninoderkinderen 0:8d87bc453349 92 #define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
ninoderkinderen 0:8d87bc453349 93 /** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
ninoderkinderen 0:8d87bc453349 94 struct tcp_pcb **tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
ninoderkinderen 0:8d87bc453349 95 &tcp_active_pcbs, &tcp_tw_pcbs};
ninoderkinderen 0:8d87bc453349 96
ninoderkinderen 0:8d87bc453349 97 /** Only used for temporary storage. */
ninoderkinderen 0:8d87bc453349 98 struct tcp_pcb *tcp_tmp_pcb;
ninoderkinderen 0:8d87bc453349 99
ninoderkinderen 0:8d87bc453349 100 /** Timer counter to handle calling slow-timer from tcp_tmr() */
ninoderkinderen 0:8d87bc453349 101 static u8_t tcp_timer;
ninoderkinderen 0:8d87bc453349 102 static u16_t tcp_new_port(void);
ninoderkinderen 0:8d87bc453349 103
ninoderkinderen 0:8d87bc453349 104 /**
ninoderkinderen 0:8d87bc453349 105 * Called periodically to dispatch TCP timers.
ninoderkinderen 0:8d87bc453349 106 *
ninoderkinderen 0:8d87bc453349 107 */
ninoderkinderen 0:8d87bc453349 108 void
ninoderkinderen 0:8d87bc453349 109 tcp_tmr(void)
ninoderkinderen 0:8d87bc453349 110 {
ninoderkinderen 0:8d87bc453349 111 /* Call tcp_fasttmr() every 250 ms */
ninoderkinderen 0:8d87bc453349 112 tcp_fasttmr();
ninoderkinderen 0:8d87bc453349 113
ninoderkinderen 0:8d87bc453349 114 if (++tcp_timer & 1) {
ninoderkinderen 0:8d87bc453349 115 /* Call tcp_tmr() every 500 ms, i.e., every other timer
ninoderkinderen 0:8d87bc453349 116 tcp_tmr() is called. */
ninoderkinderen 0:8d87bc453349 117 tcp_slowtmr();
ninoderkinderen 0:8d87bc453349 118 }
ninoderkinderen 0:8d87bc453349 119 }
ninoderkinderen 0:8d87bc453349 120
ninoderkinderen 0:8d87bc453349 121 /**
ninoderkinderen 0:8d87bc453349 122 * Closes the TX side of a connection held by the PCB.
ninoderkinderen 0:8d87bc453349 123 * For tcp_close(), a RST is sent if the application didn't receive all data
ninoderkinderen 0:8d87bc453349 124 * (tcp_recved() not called for all data passed to recv callback).
ninoderkinderen 0:8d87bc453349 125 *
ninoderkinderen 0:8d87bc453349 126 * Listening pcbs are freed and may not be referenced any more.
ninoderkinderen 0:8d87bc453349 127 * Connection pcbs are freed if not yet connected and may not be referenced
ninoderkinderen 0:8d87bc453349 128 * any more. If a connection is established (at least SYN received or in
ninoderkinderen 0:8d87bc453349 129 * a closing state), the connection is closed, and put in a closing state.
ninoderkinderen 0:8d87bc453349 130 * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
ninoderkinderen 0:8d87bc453349 131 * unsafe to reference it.
ninoderkinderen 0:8d87bc453349 132 *
ninoderkinderen 0:8d87bc453349 133 * @param pcb the tcp_pcb to close
ninoderkinderen 0:8d87bc453349 134 * @return ERR_OK if connection has been closed
ninoderkinderen 0:8d87bc453349 135 * another err_t if closing failed and pcb is not freed
ninoderkinderen 0:8d87bc453349 136 */
ninoderkinderen 0:8d87bc453349 137 static err_t
ninoderkinderen 0:8d87bc453349 138 tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
ninoderkinderen 0:8d87bc453349 139 {
ninoderkinderen 0:8d87bc453349 140 err_t err;
ninoderkinderen 0:8d87bc453349 141
ninoderkinderen 0:8d87bc453349 142 if (rst_on_unacked_data && (pcb->state != LISTEN)) {
ninoderkinderen 0:8d87bc453349 143 if ((pcb->refused_data != NULL) || (pcb->rcv_wnd != TCP_WND)) {
ninoderkinderen 0:8d87bc453349 144 /* Not all data received by application, send RST to tell the remote
ninoderkinderen 0:8d87bc453349 145 side about this. */
ninoderkinderen 0:8d87bc453349 146 LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
ninoderkinderen 0:8d87bc453349 147
ninoderkinderen 0:8d87bc453349 148 /* don't call tcp_abort here: we must not deallocate the pcb since
ninoderkinderen 0:8d87bc453349 149 that might not be expected when calling tcp_close */
ninoderkinderen 0:8d87bc453349 150 tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
ninoderkinderen 0:8d87bc453349 151 pcb->local_port, pcb->remote_port);
ninoderkinderen 0:8d87bc453349 152
ninoderkinderen 0:8d87bc453349 153 tcp_pcb_purge(pcb);
ninoderkinderen 0:8d87bc453349 154
ninoderkinderen 0:8d87bc453349 155 /* TODO: to which state do we move now? */
ninoderkinderen 0:8d87bc453349 156
ninoderkinderen 0:8d87bc453349 157 /* move to TIME_WAIT since we close actively */
ninoderkinderen 0:8d87bc453349 158 TCP_RMV(&tcp_active_pcbs, pcb);
ninoderkinderen 0:8d87bc453349 159 pcb->state = TIME_WAIT;
ninoderkinderen 0:8d87bc453349 160 TCP_REG(&tcp_tw_pcbs, pcb);
ninoderkinderen 0:8d87bc453349 161
ninoderkinderen 0:8d87bc453349 162 return ERR_OK;
ninoderkinderen 0:8d87bc453349 163 }
ninoderkinderen 0:8d87bc453349 164 }
ninoderkinderen 0:8d87bc453349 165
ninoderkinderen 0:8d87bc453349 166 switch (pcb->state) {
ninoderkinderen 0:8d87bc453349 167 case CLOSED:
ninoderkinderen 0:8d87bc453349 168 /* Closing a pcb in the CLOSED state might seem erroneous,
ninoderkinderen 0:8d87bc453349 169 * however, it is in this state once allocated and as yet unused
ninoderkinderen 0:8d87bc453349 170 * and the user needs some way to free it should the need arise.
ninoderkinderen 0:8d87bc453349 171 * Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
ninoderkinderen 0:8d87bc453349 172 * or for a pcb that has been used and then entered the CLOSED state
ninoderkinderen 0:8d87bc453349 173 * is erroneous, but this should never happen as the pcb has in those cases
ninoderkinderen 0:8d87bc453349 174 * been freed, and so any remaining handles are bogus. */
ninoderkinderen 0:8d87bc453349 175 err = ERR_OK;
ninoderkinderen 0:8d87bc453349 176 TCP_RMV(&tcp_bound_pcbs, pcb);
ninoderkinderen 0:8d87bc453349 177 memp_free(MEMP_TCP_PCB, pcb);
ninoderkinderen 0:8d87bc453349 178 pcb = NULL;
ninoderkinderen 0:8d87bc453349 179 break;
ninoderkinderen 0:8d87bc453349 180 case LISTEN:
ninoderkinderen 0:8d87bc453349 181 err = ERR_OK;
ninoderkinderen 0:8d87bc453349 182 tcp_pcb_remove(&tcp_listen_pcbs.pcbs, pcb);
ninoderkinderen 0:8d87bc453349 183 memp_free(MEMP_TCP_PCB_LISTEN, pcb);
ninoderkinderen 0:8d87bc453349 184 pcb = NULL;
ninoderkinderen 0:8d87bc453349 185 break;
ninoderkinderen 0:8d87bc453349 186 case SYN_SENT:
ninoderkinderen 0:8d87bc453349 187 err = ERR_OK;
ninoderkinderen 0:8d87bc453349 188 tcp_pcb_remove(&tcp_active_pcbs, pcb);
ninoderkinderen 0:8d87bc453349 189 memp_free(MEMP_TCP_PCB, pcb);
ninoderkinderen 0:8d87bc453349 190 pcb = NULL;
ninoderkinderen 0:8d87bc453349 191 snmp_inc_tcpattemptfails();
ninoderkinderen 0:8d87bc453349 192 break;
ninoderkinderen 0:8d87bc453349 193 case SYN_RCVD:
ninoderkinderen 0:8d87bc453349 194 err = tcp_send_fin(pcb);
ninoderkinderen 0:8d87bc453349 195 if (err == ERR_OK) {
ninoderkinderen 0:8d87bc453349 196 snmp_inc_tcpattemptfails();
ninoderkinderen 0:8d87bc453349 197 pcb->state = FIN_WAIT_1;
ninoderkinderen 0:8d87bc453349 198 }
ninoderkinderen 0:8d87bc453349 199 break;
ninoderkinderen 0:8d87bc453349 200 case ESTABLISHED:
ninoderkinderen 0:8d87bc453349 201 err = tcp_send_fin(pcb);
ninoderkinderen 0:8d87bc453349 202 if (err == ERR_OK) {
ninoderkinderen 0:8d87bc453349 203 snmp_inc_tcpestabresets();
ninoderkinderen 0:8d87bc453349 204 pcb->state = FIN_WAIT_1;
ninoderkinderen 0:8d87bc453349 205 }
ninoderkinderen 0:8d87bc453349 206 break;
ninoderkinderen 0:8d87bc453349 207 case CLOSE_WAIT:
ninoderkinderen 0:8d87bc453349 208 err = tcp_send_fin(pcb);
ninoderkinderen 0:8d87bc453349 209 if (err == ERR_OK) {
ninoderkinderen 0:8d87bc453349 210 snmp_inc_tcpestabresets();
ninoderkinderen 0:8d87bc453349 211 pcb->state = LAST_ACK;
ninoderkinderen 0:8d87bc453349 212 }
ninoderkinderen 0:8d87bc453349 213 break;
ninoderkinderen 0:8d87bc453349 214 default:
ninoderkinderen 0:8d87bc453349 215 /* Has already been closed, do nothing. */
ninoderkinderen 0:8d87bc453349 216 err = ERR_OK;
ninoderkinderen 0:8d87bc453349 217 pcb = NULL;
ninoderkinderen 0:8d87bc453349 218 break;
ninoderkinderen 0:8d87bc453349 219 }
ninoderkinderen 0:8d87bc453349 220
ninoderkinderen 0:8d87bc453349 221 if (pcb != NULL && err == ERR_OK) {
ninoderkinderen 0:8d87bc453349 222 /* To ensure all data has been sent when tcp_close returns, we have
ninoderkinderen 0:8d87bc453349 223 to make sure tcp_output doesn't fail.
ninoderkinderen 0:8d87bc453349 224 Since we don't really have to ensure all data has been sent when tcp_close
ninoderkinderen 0:8d87bc453349 225 returns (unsent data is sent from tcp timer functions, also), we don't care
ninoderkinderen 0:8d87bc453349 226 for the return value of tcp_output for now. */
ninoderkinderen 0:8d87bc453349 227 /* @todo: When implementing SO_LINGER, this must be changed somehow:
ninoderkinderen 0:8d87bc453349 228 If SOF_LINGER is set, the data should be sent and acked before close returns.
ninoderkinderen 0:8d87bc453349 229 This can only be valid for sequential APIs, not for the raw API. */
ninoderkinderen 0:8d87bc453349 230 tcp_output(pcb);
ninoderkinderen 0:8d87bc453349 231 }
ninoderkinderen 0:8d87bc453349 232 return err;
ninoderkinderen 0:8d87bc453349 233 }
ninoderkinderen 0:8d87bc453349 234
ninoderkinderen 0:8d87bc453349 235 /**
ninoderkinderen 0:8d87bc453349 236 * Closes the connection held by the PCB.
ninoderkinderen 0:8d87bc453349 237 *
ninoderkinderen 0:8d87bc453349 238 * Listening pcbs are freed and may not be referenced any more.
ninoderkinderen 0:8d87bc453349 239 * Connection pcbs are freed if not yet connected and may not be referenced
ninoderkinderen 0:8d87bc453349 240 * any more. If a connection is established (at least SYN received or in
ninoderkinderen 0:8d87bc453349 241 * a closing state), the connection is closed, and put in a closing state.
ninoderkinderen 0:8d87bc453349 242 * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
ninoderkinderen 0:8d87bc453349 243 * unsafe to reference it (unless an error is returned).
ninoderkinderen 0:8d87bc453349 244 *
ninoderkinderen 0:8d87bc453349 245 * @param pcb the tcp_pcb to close
ninoderkinderen 0:8d87bc453349 246 * @return ERR_OK if connection has been closed
ninoderkinderen 0:8d87bc453349 247 * another err_t if closing failed and pcb is not freed
ninoderkinderen 0:8d87bc453349 248 */
ninoderkinderen 0:8d87bc453349 249 err_t
ninoderkinderen 0:8d87bc453349 250 tcp_close(struct tcp_pcb *pcb)
ninoderkinderen 0:8d87bc453349 251 {
ninoderkinderen 0:8d87bc453349 252 #if TCP_DEBUG
ninoderkinderen 0:8d87bc453349 253 LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
ninoderkinderen 0:8d87bc453349 254 tcp_debug_print_state(pcb->state);
ninoderkinderen 0:8d87bc453349 255 #endif /* TCP_DEBUG */
ninoderkinderen 0:8d87bc453349 256
ninoderkinderen 0:8d87bc453349 257 if (pcb->state != LISTEN) {
ninoderkinderen 0:8d87bc453349 258 /* Set a flag not to receive any more data... */
ninoderkinderen 0:8d87bc453349 259 pcb->flags |= TF_RXCLOSED;
ninoderkinderen 0:8d87bc453349 260 }
ninoderkinderen 0:8d87bc453349 261 /* ... and close */
ninoderkinderen 0:8d87bc453349 262 return tcp_close_shutdown(pcb, 1);
ninoderkinderen 0:8d87bc453349 263 }
ninoderkinderen 0:8d87bc453349 264
ninoderkinderen 0:8d87bc453349 265 /**
ninoderkinderen 0:8d87bc453349 266 * Causes all or part of a full-duplex connection of this PCB to be shut down.
ninoderkinderen 0:8d87bc453349 267 * This doesn't deallocate the PCB!
ninoderkinderen 0:8d87bc453349 268 *
ninoderkinderen 0:8d87bc453349 269 * @param pcb PCB to shutdown
ninoderkinderen 0:8d87bc453349 270 * @param shut_rx shut down receive side if this is != 0
ninoderkinderen 0:8d87bc453349 271 * @param shut_tx shut down send side if this is != 0
ninoderkinderen 0:8d87bc453349 272 * @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
ninoderkinderen 0:8d87bc453349 273 * another err_t on error.
ninoderkinderen 0:8d87bc453349 274 */
ninoderkinderen 0:8d87bc453349 275 err_t
ninoderkinderen 0:8d87bc453349 276 tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
ninoderkinderen 0:8d87bc453349 277 {
ninoderkinderen 0:8d87bc453349 278 if (pcb->state == LISTEN) {
ninoderkinderen 0:8d87bc453349 279 return ERR_CONN;
ninoderkinderen 0:8d87bc453349 280 }
ninoderkinderen 0:8d87bc453349 281 if (shut_rx) {
ninoderkinderen 0:8d87bc453349 282 /* shut down the receive side: free buffered data... */
ninoderkinderen 0:8d87bc453349 283 if (pcb->refused_data != NULL) {
ninoderkinderen 0:8d87bc453349 284 pbuf_free(pcb->refused_data);
ninoderkinderen 0:8d87bc453349 285 pcb->refused_data = NULL;
ninoderkinderen 0:8d87bc453349 286 }
ninoderkinderen 0:8d87bc453349 287 /* ... and set a flag not to receive any more data */
ninoderkinderen 0:8d87bc453349 288 pcb->flags |= TF_RXCLOSED;
ninoderkinderen 0:8d87bc453349 289 }
ninoderkinderen 0:8d87bc453349 290 if (shut_tx) {
ninoderkinderen 0:8d87bc453349 291 /* This can't happen twice since if it succeeds, the pcb's state is changed.
ninoderkinderen 0:8d87bc453349 292 Only close in these states as the others directly deallocate the PCB */
ninoderkinderen 0:8d87bc453349 293 switch (pcb->state) {
ninoderkinderen 0:8d87bc453349 294 case SYN_RCVD:
ninoderkinderen 0:8d87bc453349 295 case ESTABLISHED:
ninoderkinderen 0:8d87bc453349 296 case CLOSE_WAIT:
ninoderkinderen 0:8d87bc453349 297 return tcp_close_shutdown(pcb, 0);
ninoderkinderen 0:8d87bc453349 298 default:
ninoderkinderen 0:8d87bc453349 299 /* don't shut down other states */
ninoderkinderen 0:8d87bc453349 300 break;
ninoderkinderen 0:8d87bc453349 301 }
ninoderkinderen 0:8d87bc453349 302 }
ninoderkinderen 0:8d87bc453349 303 /* @todo: return another err_t if not in correct state or already shut? */
ninoderkinderen 0:8d87bc453349 304 return ERR_OK;
ninoderkinderen 0:8d87bc453349 305 }
ninoderkinderen 0:8d87bc453349 306
ninoderkinderen 0:8d87bc453349 307 /**
ninoderkinderen 0:8d87bc453349 308 * Abandons a connection and optionally sends a RST to the remote
ninoderkinderen 0:8d87bc453349 309 * host. Deletes the local protocol control block. This is done when
ninoderkinderen 0:8d87bc453349 310 * a connection is killed because of shortage of memory.
ninoderkinderen 0:8d87bc453349 311 *
ninoderkinderen 0:8d87bc453349 312 * @param pcb the tcp_pcb to abort
ninoderkinderen 0:8d87bc453349 313 * @param reset boolean to indicate whether a reset should be sent
ninoderkinderen 0:8d87bc453349 314 */
ninoderkinderen 0:8d87bc453349 315 void
ninoderkinderen 0:8d87bc453349 316 tcp_abandon(struct tcp_pcb *pcb, int reset)
ninoderkinderen 0:8d87bc453349 317 {
ninoderkinderen 0:8d87bc453349 318 u32_t seqno, ackno;
ninoderkinderen 0:8d87bc453349 319 u16_t remote_port, local_port;
ninoderkinderen 0:8d87bc453349 320 ip_addr_t remote_ip, local_ip;
ninoderkinderen 0:8d87bc453349 321 #if LWIP_CALLBACK_API
ninoderkinderen 0:8d87bc453349 322 tcp_err_fn errf;
ninoderkinderen 0:8d87bc453349 323 #endif /* LWIP_CALLBACK_API */
ninoderkinderen 0:8d87bc453349 324 void *errf_arg;
ninoderkinderen 0:8d87bc453349 325
ninoderkinderen 0:8d87bc453349 326 /* pcb->state LISTEN not allowed here */
ninoderkinderen 0:8d87bc453349 327 LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
ninoderkinderen 0:8d87bc453349 328 pcb->state != LISTEN);
ninoderkinderen 0:8d87bc453349 329 /* Figure out on which TCP PCB list we are, and remove us. If we
ninoderkinderen 0:8d87bc453349 330 are in an active state, call the receive function associated with
ninoderkinderen 0:8d87bc453349 331 the PCB with a NULL argument, and send an RST to the remote end. */
ninoderkinderen 0:8d87bc453349 332 if (pcb->state == TIME_WAIT) {
ninoderkinderen 0:8d87bc453349 333 tcp_pcb_remove(&tcp_tw_pcbs, pcb);
ninoderkinderen 0:8d87bc453349 334 memp_free(MEMP_TCP_PCB, pcb);
ninoderkinderen 0:8d87bc453349 335 } else {
ninoderkinderen 0:8d87bc453349 336 seqno = pcb->snd_nxt;
ninoderkinderen 0:8d87bc453349 337 ackno = pcb->rcv_nxt;
ninoderkinderen 0:8d87bc453349 338 ip_addr_copy(local_ip, pcb->local_ip);
ninoderkinderen 0:8d87bc453349 339 ip_addr_copy(remote_ip, pcb->remote_ip);
ninoderkinderen 0:8d87bc453349 340 local_port = pcb->local_port;
ninoderkinderen 0:8d87bc453349 341 remote_port = pcb->remote_port;
ninoderkinderen 0:8d87bc453349 342 #if LWIP_CALLBACK_API
ninoderkinderen 0:8d87bc453349 343 errf = pcb->errf;
ninoderkinderen 0:8d87bc453349 344 #endif /* LWIP_CALLBACK_API */
ninoderkinderen 0:8d87bc453349 345 errf_arg = pcb->callback_arg;
ninoderkinderen 0:8d87bc453349 346 tcp_pcb_remove(&tcp_active_pcbs, pcb);
ninoderkinderen 0:8d87bc453349 347 if (pcb->unacked != NULL) {
ninoderkinderen 0:8d87bc453349 348 tcp_segs_free(pcb->unacked);
ninoderkinderen 0:8d87bc453349 349 }
ninoderkinderen 0:8d87bc453349 350 if (pcb->unsent != NULL) {
ninoderkinderen 0:8d87bc453349 351 tcp_segs_free(pcb->unsent);
ninoderkinderen 0:8d87bc453349 352 }
ninoderkinderen 0:8d87bc453349 353 #if TCP_QUEUE_OOSEQ
ninoderkinderen 0:8d87bc453349 354 if (pcb->ooseq != NULL) {
ninoderkinderen 0:8d87bc453349 355 tcp_segs_free(pcb->ooseq);
ninoderkinderen 0:8d87bc453349 356 }
ninoderkinderen 0:8d87bc453349 357 #endif /* TCP_QUEUE_OOSEQ */
ninoderkinderen 0:8d87bc453349 358 memp_free(MEMP_TCP_PCB, pcb);
ninoderkinderen 0:8d87bc453349 359 TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
ninoderkinderen 0:8d87bc453349 360 if (reset) {
ninoderkinderen 0:8d87bc453349 361 LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
ninoderkinderen 0:8d87bc453349 362 tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port);
ninoderkinderen 0:8d87bc453349 363 }
ninoderkinderen 0:8d87bc453349 364 }
ninoderkinderen 0:8d87bc453349 365 }
ninoderkinderen 0:8d87bc453349 366
ninoderkinderen 0:8d87bc453349 367 /**
ninoderkinderen 0:8d87bc453349 368 * Aborts the connection by sending a RST (reset) segment to the remote
ninoderkinderen 0:8d87bc453349 369 * host. The pcb is deallocated. This function never fails.
ninoderkinderen 0:8d87bc453349 370 *
ninoderkinderen 0:8d87bc453349 371 * ATTENTION: When calling this from one of the TCP callbacks, make
ninoderkinderen 0:8d87bc453349 372 * sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
ninoderkinderen 0:8d87bc453349 373 * or you will risk accessing deallocated memory or memory leaks!
ninoderkinderen 0:8d87bc453349 374 *
ninoderkinderen 0:8d87bc453349 375 * @param pcb the tcp pcb to abort
ninoderkinderen 0:8d87bc453349 376 */
ninoderkinderen 0:8d87bc453349 377 void
ninoderkinderen 0:8d87bc453349 378 tcp_abort(struct tcp_pcb *pcb)
ninoderkinderen 0:8d87bc453349 379 {
ninoderkinderen 0:8d87bc453349 380 tcp_abandon(pcb, 1);
ninoderkinderen 0:8d87bc453349 381 }
ninoderkinderen 0:8d87bc453349 382
ninoderkinderen 0:8d87bc453349 383 /**
ninoderkinderen 0:8d87bc453349 384 * Binds the connection to a local portnumber and IP address. If the
ninoderkinderen 0:8d87bc453349 385 * IP address is not given (i.e., ipaddr == NULL), the IP address of
ninoderkinderen 0:8d87bc453349 386 * the outgoing network interface is used instead.
ninoderkinderen 0:8d87bc453349 387 *
ninoderkinderen 0:8d87bc453349 388 * @param pcb the tcp_pcb to bind (no check is done whether this pcb is
ninoderkinderen 0:8d87bc453349 389 * already bound!)
ninoderkinderen 0:8d87bc453349 390 * @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
ninoderkinderen 0:8d87bc453349 391 * to any local address
ninoderkinderen 0:8d87bc453349 392 * @param port the local port to bind to
ninoderkinderen 0:8d87bc453349 393 * @return ERR_USE if the port is already in use
ninoderkinderen 0:8d87bc453349 394 * ERR_OK if bound
ninoderkinderen 0:8d87bc453349 395 */
ninoderkinderen 0:8d87bc453349 396 err_t
ninoderkinderen 0:8d87bc453349 397 tcp_bind(struct tcp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
ninoderkinderen 0:8d87bc453349 398 {
ninoderkinderen 0:8d87bc453349 399 int i;
ninoderkinderen 0:8d87bc453349 400 int max_pcb_list = NUM_TCP_PCB_LISTS;
ninoderkinderen 0:8d87bc453349 401 struct tcp_pcb *cpcb;
ninoderkinderen 0:8d87bc453349 402
ninoderkinderen 0:8d87bc453349 403 LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
ninoderkinderen 0:8d87bc453349 404
ninoderkinderen 0:8d87bc453349 405 #if SO_REUSE
ninoderkinderen 0:8d87bc453349 406 /* Unless the REUSEADDR flag is set,
ninoderkinderen 0:8d87bc453349 407 we have to check the pcbs in TIME-WAIT state, also.
ninoderkinderen 0:8d87bc453349 408 We do not dump TIME_WAIT pcb's; they can still be matched by incoming
ninoderkinderen 0:8d87bc453349 409 packets using both local and remote IP addresses and ports to distinguish.
ninoderkinderen 0:8d87bc453349 410 */
ninoderkinderen 0:8d87bc453349 411 #if SO_REUSE
ninoderkinderen 0:8d87bc453349 412 if ((pcb->so_options & SOF_REUSEADDR) != 0) {
ninoderkinderen 0:8d87bc453349 413 max_pcb_list = NUM_TCP_PCB_LISTS_NO_TIME_WAIT;
ninoderkinderen 0:8d87bc453349 414 }
ninoderkinderen 0:8d87bc453349 415 #endif /* SO_REUSE */
ninoderkinderen 0:8d87bc453349 416 #endif /* SO_REUSE */
ninoderkinderen 0:8d87bc453349 417
ninoderkinderen 0:8d87bc453349 418 if (port == 0) {
ninoderkinderen 0:8d87bc453349 419 port = tcp_new_port();
ninoderkinderen 0:8d87bc453349 420 }
ninoderkinderen 0:8d87bc453349 421
ninoderkinderen 0:8d87bc453349 422 /* Check if the address already is in use (on all lists) */
ninoderkinderen 0:8d87bc453349 423 for (i = 0; i < max_pcb_list; i++) {
ninoderkinderen 0:8d87bc453349 424 for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
ninoderkinderen 0:8d87bc453349 425 if (cpcb->local_port == port) {
ninoderkinderen 0:8d87bc453349 426 #if SO_REUSE
ninoderkinderen 0:8d87bc453349 427 /* Omit checking for the same port if both pcbs have REUSEADDR set.
ninoderkinderen 0:8d87bc453349 428 For SO_REUSEADDR, the duplicate-check for a 5-tuple is done in
ninoderkinderen 0:8d87bc453349 429 tcp_connect. */
ninoderkinderen 0:8d87bc453349 430 if (((pcb->so_options & SOF_REUSEADDR) == 0) ||
ninoderkinderen 0:8d87bc453349 431 ((cpcb->so_options & SOF_REUSEADDR) == 0))
ninoderkinderen 0:8d87bc453349 432 #endif /* SO_REUSE */
ninoderkinderen 0:8d87bc453349 433 {
ninoderkinderen 0:8d87bc453349 434 if (ip_addr_isany(&(cpcb->local_ip)) ||
ninoderkinderen 0:8d87bc453349 435 ip_addr_isany(ipaddr) ||
ninoderkinderen 0:8d87bc453349 436 ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
ninoderkinderen 0:8d87bc453349 437 return ERR_USE;
ninoderkinderen 0:8d87bc453349 438 }
ninoderkinderen 0:8d87bc453349 439 }
ninoderkinderen 0:8d87bc453349 440 }
ninoderkinderen 0:8d87bc453349 441 }
ninoderkinderen 0:8d87bc453349 442 }
ninoderkinderen 0:8d87bc453349 443
ninoderkinderen 0:8d87bc453349 444 if (!ip_addr_isany(ipaddr)) {
ninoderkinderen 0:8d87bc453349 445 pcb->local_ip = *ipaddr;
ninoderkinderen 0:8d87bc453349 446 }
ninoderkinderen 0:8d87bc453349 447 pcb->local_port = port;
ninoderkinderen 0:8d87bc453349 448 TCP_REG(&tcp_bound_pcbs, pcb);
ninoderkinderen 0:8d87bc453349 449 LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
ninoderkinderen 0:8d87bc453349 450 return ERR_OK;
ninoderkinderen 0:8d87bc453349 451 }
ninoderkinderen 0:8d87bc453349 452 #if LWIP_CALLBACK_API
ninoderkinderen 0:8d87bc453349 453 /**
ninoderkinderen 0:8d87bc453349 454 * Default accept callback if no accept callback is specified by the user.
ninoderkinderen 0:8d87bc453349 455 */
ninoderkinderen 0:8d87bc453349 456 static err_t
ninoderkinderen 0:8d87bc453349 457 tcp_accept_null(void *arg, struct tcp_pcb *pcb, err_t err)
ninoderkinderen 0:8d87bc453349 458 {
ninoderkinderen 0:8d87bc453349 459 LWIP_UNUSED_ARG(arg);
ninoderkinderen 0:8d87bc453349 460 LWIP_UNUSED_ARG(pcb);
ninoderkinderen 0:8d87bc453349 461 LWIP_UNUSED_ARG(err);
ninoderkinderen 0:8d87bc453349 462
ninoderkinderen 0:8d87bc453349 463 return ERR_ABRT;
ninoderkinderen 0:8d87bc453349 464 }
ninoderkinderen 0:8d87bc453349 465 #endif /* LWIP_CALLBACK_API */
ninoderkinderen 0:8d87bc453349 466
ninoderkinderen 0:8d87bc453349 467 /**
ninoderkinderen 0:8d87bc453349 468 * Set the state of the connection to be LISTEN, which means that it
ninoderkinderen 0:8d87bc453349 469 * is able to accept incoming connections. The protocol control block
ninoderkinderen 0:8d87bc453349 470 * is reallocated in order to consume less memory. Setting the
ninoderkinderen 0:8d87bc453349 471 * connection to LISTEN is an irreversible process.
ninoderkinderen 0:8d87bc453349 472 *
ninoderkinderen 0:8d87bc453349 473 * @param pcb the original tcp_pcb
ninoderkinderen 0:8d87bc453349 474 * @param backlog the incoming connections queue limit
ninoderkinderen 0:8d87bc453349 475 * @return tcp_pcb used for listening, consumes less memory.
ninoderkinderen 0:8d87bc453349 476 *
ninoderkinderen 0:8d87bc453349 477 * @note The original tcp_pcb is freed. This function therefore has to be
ninoderkinderen 0:8d87bc453349 478 * called like this:
ninoderkinderen 0:8d87bc453349 479 * tpcb = tcp_listen(tpcb);
ninoderkinderen 0:8d87bc453349 480 */
ninoderkinderen 0:8d87bc453349 481 struct tcp_pcb *
ninoderkinderen 0:8d87bc453349 482 tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
ninoderkinderen 0:8d87bc453349 483 {
ninoderkinderen 0:8d87bc453349 484 struct tcp_pcb_listen *lpcb;
ninoderkinderen 0:8d87bc453349 485
ninoderkinderen 0:8d87bc453349 486 LWIP_UNUSED_ARG(backlog);
ninoderkinderen 0:8d87bc453349 487 LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL);
ninoderkinderen 0:8d87bc453349 488
ninoderkinderen 0:8d87bc453349 489 /* already listening? */
ninoderkinderen 0:8d87bc453349 490 if (pcb->state == LISTEN) {
ninoderkinderen 0:8d87bc453349 491 return pcb;
ninoderkinderen 0:8d87bc453349 492 }
ninoderkinderen 0:8d87bc453349 493 #if SO_REUSE
ninoderkinderen 0:8d87bc453349 494 if ((pcb->so_options & SOF_REUSEADDR) != 0) {
ninoderkinderen 0:8d87bc453349 495 /* Since SOF_REUSEADDR allows reusing a local address before the pcb's usage
ninoderkinderen 0:8d87bc453349 496 is declared (listen-/connection-pcb), we have to make sure now that
ninoderkinderen 0:8d87bc453349 497 this port is only used once for every local IP. */
ninoderkinderen 0:8d87bc453349 498 for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
ninoderkinderen 0:8d87bc453349 499 if (lpcb->local_port == pcb->local_port) {
ninoderkinderen 0:8d87bc453349 500 if (ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
ninoderkinderen 0:8d87bc453349 501 /* this address/port is already used */
ninoderkinderen 0:8d87bc453349 502 return NULL;
ninoderkinderen 0:8d87bc453349 503 }
ninoderkinderen 0:8d87bc453349 504 }
ninoderkinderen 0:8d87bc453349 505 }
ninoderkinderen 0:8d87bc453349 506 }
ninoderkinderen 0:8d87bc453349 507 #endif /* SO_REUSE */
ninoderkinderen 0:8d87bc453349 508 lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
ninoderkinderen 0:8d87bc453349 509 if (lpcb == NULL) {
ninoderkinderen 0:8d87bc453349 510 return NULL;
ninoderkinderen 0:8d87bc453349 511 }
ninoderkinderen 0:8d87bc453349 512 lpcb->callback_arg = pcb->callback_arg;
ninoderkinderen 0:8d87bc453349 513 lpcb->local_port = pcb->local_port;
ninoderkinderen 0:8d87bc453349 514 lpcb->state = LISTEN;
ninoderkinderen 0:8d87bc453349 515 lpcb->prio = pcb->prio;
ninoderkinderen 0:8d87bc453349 516 lpcb->so_options = pcb->so_options;
ninoderkinderen 0:8d87bc453349 517 lpcb->so_options |= SOF_ACCEPTCONN;
ninoderkinderen 0:8d87bc453349 518 lpcb->ttl = pcb->ttl;
ninoderkinderen 0:8d87bc453349 519 lpcb->tos = pcb->tos;
ninoderkinderen 0:8d87bc453349 520 ip_addr_copy(lpcb->local_ip, pcb->local_ip);
ninoderkinderen 0:8d87bc453349 521 TCP_RMV(&tcp_bound_pcbs, pcb);
ninoderkinderen 0:8d87bc453349 522 memp_free(MEMP_TCP_PCB, pcb);
ninoderkinderen 0:8d87bc453349 523 #if LWIP_CALLBACK_API
ninoderkinderen 0:8d87bc453349 524 lpcb->accept = tcp_accept_null;
ninoderkinderen 0:8d87bc453349 525 #endif /* LWIP_CALLBACK_API */
ninoderkinderen 0:8d87bc453349 526 #if TCP_LISTEN_BACKLOG
ninoderkinderen 0:8d87bc453349 527 lpcb->accepts_pending = 0;
ninoderkinderen 0:8d87bc453349 528 lpcb->backlog = (backlog ? backlog : 1);
ninoderkinderen 0:8d87bc453349 529 #endif /* TCP_LISTEN_BACKLOG */
ninoderkinderen 0:8d87bc453349 530 TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
ninoderkinderen 0:8d87bc453349 531 return (struct tcp_pcb *)lpcb;
ninoderkinderen 0:8d87bc453349 532 }
ninoderkinderen 0:8d87bc453349 533
ninoderkinderen 0:8d87bc453349 534 /**
ninoderkinderen 0:8d87bc453349 535 * Update the state that tracks the available window space to advertise.
ninoderkinderen 0:8d87bc453349 536 *
ninoderkinderen 0:8d87bc453349 537 * Returns how much extra window would be advertised if we sent an
ninoderkinderen 0:8d87bc453349 538 * update now.
ninoderkinderen 0:8d87bc453349 539 */
ninoderkinderen 0:8d87bc453349 540 u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
ninoderkinderen 0:8d87bc453349 541 {
ninoderkinderen 0:8d87bc453349 542 u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
ninoderkinderen 0:8d87bc453349 543
ninoderkinderen 0:8d87bc453349 544 if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) {
ninoderkinderen 0:8d87bc453349 545 /* we can advertise more window */
ninoderkinderen 0:8d87bc453349 546 pcb->rcv_ann_wnd = pcb->rcv_wnd;
ninoderkinderen 0:8d87bc453349 547 return new_right_edge - pcb->rcv_ann_right_edge;
ninoderkinderen 0:8d87bc453349 548 } else {
ninoderkinderen 0:8d87bc453349 549 if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
ninoderkinderen 0:8d87bc453349 550 /* Can happen due to other end sending out of advertised window,
ninoderkinderen 0:8d87bc453349 551 * but within actual available (but not yet advertised) window */
ninoderkinderen 0:8d87bc453349 552 pcb->rcv_ann_wnd = 0;
ninoderkinderen 0:8d87bc453349 553 } else {
ninoderkinderen 0:8d87bc453349 554 /* keep the right edge of window constant */
ninoderkinderen 0:8d87bc453349 555 u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
ninoderkinderen 0:8d87bc453349 556 LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff", new_rcv_ann_wnd <= 0xffff);
ninoderkinderen 0:8d87bc453349 557 pcb->rcv_ann_wnd = (u16_t)new_rcv_ann_wnd;
ninoderkinderen 0:8d87bc453349 558 }
ninoderkinderen 0:8d87bc453349 559 return 0;
ninoderkinderen 0:8d87bc453349 560 }
ninoderkinderen 0:8d87bc453349 561 }
ninoderkinderen 0:8d87bc453349 562
ninoderkinderen 0:8d87bc453349 563 /**
ninoderkinderen 0:8d87bc453349 564 * This function should be called by the application when it has
ninoderkinderen 0:8d87bc453349 565 * processed the data. The purpose is to advertise a larger window
ninoderkinderen 0:8d87bc453349 566 * when the data has been processed.
ninoderkinderen 0:8d87bc453349 567 *
ninoderkinderen 0:8d87bc453349 568 * @param pcb the tcp_pcb for which data is read
ninoderkinderen 0:8d87bc453349 569 * @param len the amount of bytes that have been read by the application
ninoderkinderen 0:8d87bc453349 570 */
ninoderkinderen 0:8d87bc453349 571 void
ninoderkinderen 0:8d87bc453349 572 tcp_recved(struct tcp_pcb *pcb, u16_t len)
ninoderkinderen 0:8d87bc453349 573 {
ninoderkinderen 0:8d87bc453349 574 int wnd_inflation;
ninoderkinderen 0:8d87bc453349 575
ninoderkinderen 0:8d87bc453349 576 LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
ninoderkinderen 0:8d87bc453349 577 len <= 0xffff - pcb->rcv_wnd );
ninoderkinderen 0:8d87bc453349 578
ninoderkinderen 0:8d87bc453349 579 pcb->rcv_wnd += len;
ninoderkinderen 0:8d87bc453349 580 if (pcb->rcv_wnd > TCP_WND) {
ninoderkinderen 0:8d87bc453349 581 pcb->rcv_wnd = TCP_WND;
ninoderkinderen 0:8d87bc453349 582 }
ninoderkinderen 0:8d87bc453349 583
ninoderkinderen 0:8d87bc453349 584 wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
ninoderkinderen 0:8d87bc453349 585
ninoderkinderen 0:8d87bc453349 586 /* If the change in the right edge of window is significant (default
ninoderkinderen 0:8d87bc453349 587 * watermark is TCP_WND/4), then send an explicit update now.
ninoderkinderen 0:8d87bc453349 588 * Otherwise wait for a packet to be sent in the normal course of
ninoderkinderen 0:8d87bc453349 589 * events (or more window to be available later) */
ninoderkinderen 0:8d87bc453349 590 if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
ninoderkinderen 0:8d87bc453349 591 tcp_ack_now(pcb);
ninoderkinderen 0:8d87bc453349 592 tcp_output(pcb);
ninoderkinderen 0:8d87bc453349 593 }
ninoderkinderen 0:8d87bc453349 594
ninoderkinderen 0:8d87bc453349 595 LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
ninoderkinderen 0:8d87bc453349 596 len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
ninoderkinderen 0:8d87bc453349 597 }
ninoderkinderen 0:8d87bc453349 598
ninoderkinderen 0:8d87bc453349 599 /**
ninoderkinderen 0:8d87bc453349 600 * A nastly hack featuring 'goto' statements that allocates a
ninoderkinderen 0:8d87bc453349 601 * new TCP local port.
ninoderkinderen 0:8d87bc453349 602 *
ninoderkinderen 0:8d87bc453349 603 * @return a new (free) local TCP port number
ninoderkinderen 0:8d87bc453349 604 */
ninoderkinderen 0:8d87bc453349 605 static u16_t
ninoderkinderen 0:8d87bc453349 606 tcp_new_port(void)
ninoderkinderen 0:8d87bc453349 607 {
ninoderkinderen 0:8d87bc453349 608 int i;
ninoderkinderen 0:8d87bc453349 609 struct tcp_pcb *pcb;
ninoderkinderen 0:8d87bc453349 610 #ifndef TCP_LOCAL_PORT_RANGE_START
ninoderkinderen 0:8d87bc453349 611 #define TCP_LOCAL_PORT_RANGE_START 4096
ninoderkinderen 0:8d87bc453349 612 #define TCP_LOCAL_PORT_RANGE_END 0x7fff
ninoderkinderen 0:8d87bc453349 613 #endif
ninoderkinderen 0:8d87bc453349 614 static u16_t port = TCP_LOCAL_PORT_RANGE_START;
ninoderkinderen 0:8d87bc453349 615
ninoderkinderen 0:8d87bc453349 616 again:
ninoderkinderen 0:8d87bc453349 617 if (++port > TCP_LOCAL_PORT_RANGE_END) {
ninoderkinderen 0:8d87bc453349 618 port = TCP_LOCAL_PORT_RANGE_START;
ninoderkinderen 0:8d87bc453349 619 }
ninoderkinderen 0:8d87bc453349 620 /* Check all PCB lists. */
ninoderkinderen 0:8d87bc453349 621 for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
ninoderkinderen 0:8d87bc453349 622 for(pcb = *tcp_pcb_lists[i]; pcb != NULL; pcb = pcb->next) {
ninoderkinderen 0:8d87bc453349 623 if (pcb->local_port == port) {
ninoderkinderen 0:8d87bc453349 624 goto again;
ninoderkinderen 0:8d87bc453349 625 }
ninoderkinderen 0:8d87bc453349 626 }
ninoderkinderen 0:8d87bc453349 627 }
ninoderkinderen 0:8d87bc453349 628 return port;
ninoderkinderen 0:8d87bc453349 629 }
ninoderkinderen 0:8d87bc453349 630
ninoderkinderen 0:8d87bc453349 631 /**
ninoderkinderen 0:8d87bc453349 632 * Connects to another host. The function given as the "connected"
ninoderkinderen 0:8d87bc453349 633 * argument will be called when the connection has been established.
ninoderkinderen 0:8d87bc453349 634 *
ninoderkinderen 0:8d87bc453349 635 * @param pcb the tcp_pcb used to establish the connection
ninoderkinderen 0:8d87bc453349 636 * @param ipaddr the remote ip address to connect to
ninoderkinderen 0:8d87bc453349 637 * @param port the remote tcp port to connect to
ninoderkinderen 0:8d87bc453349 638 * @param connected callback function to call when connected (or on error)
ninoderkinderen 0:8d87bc453349 639 * @return ERR_VAL if invalid arguments are given
ninoderkinderen 0:8d87bc453349 640 * ERR_OK if connect request has been sent
ninoderkinderen 0:8d87bc453349 641 * other err_t values if connect request couldn't be sent
ninoderkinderen 0:8d87bc453349 642 */
ninoderkinderen 0:8d87bc453349 643 err_t
ninoderkinderen 0:8d87bc453349 644 tcp_connect(struct tcp_pcb *pcb, ip_addr_t *ipaddr, u16_t port,
ninoderkinderen 0:8d87bc453349 645 tcp_connected_fn connected)
ninoderkinderen 0:8d87bc453349 646 {
ninoderkinderen 0:8d87bc453349 647 err_t ret;
ninoderkinderen 0:8d87bc453349 648 u32_t iss;
ninoderkinderen 0:8d87bc453349 649
ninoderkinderen 0:8d87bc453349 650 LWIP_ERROR("tcp_connect: can only connected from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
ninoderkinderen 0:8d87bc453349 651
ninoderkinderen 0:8d87bc453349 652 LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
ninoderkinderen 0:8d87bc453349 653 if (ipaddr != NULL) {
ninoderkinderen 0:8d87bc453349 654 pcb->remote_ip = *ipaddr;
ninoderkinderen 0:8d87bc453349 655 } else {
ninoderkinderen 0:8d87bc453349 656 return ERR_VAL;
ninoderkinderen 0:8d87bc453349 657 }
ninoderkinderen 0:8d87bc453349 658 pcb->remote_port = port;
ninoderkinderen 0:8d87bc453349 659
ninoderkinderen 0:8d87bc453349 660 /* check if we have a route to the remote host */
ninoderkinderen 0:8d87bc453349 661 if (ip_addr_isany(&(pcb->local_ip))) {
ninoderkinderen 0:8d87bc453349 662 /* no local IP address set, yet. */
ninoderkinderen 0:8d87bc453349 663 struct netif *netif = ip_route(&(pcb->remote_ip));
ninoderkinderen 0:8d87bc453349 664 if (netif == NULL) {
ninoderkinderen 0:8d87bc453349 665 /* Don't even try to send a SYN packet if we have no route
ninoderkinderen 0:8d87bc453349 666 since that will fail. */
ninoderkinderen 0:8d87bc453349 667 return ERR_RTE;
ninoderkinderen 0:8d87bc453349 668 }
ninoderkinderen 0:8d87bc453349 669 /* Use the netif's IP address as local address. */
ninoderkinderen 0:8d87bc453349 670 ip_addr_copy(pcb->local_ip, netif->ip_addr);
ninoderkinderen 0:8d87bc453349 671 }
ninoderkinderen 0:8d87bc453349 672
ninoderkinderen 0:8d87bc453349 673 if (pcb->local_port == 0) {
ninoderkinderen 0:8d87bc453349 674 pcb->local_port = tcp_new_port();
ninoderkinderen 0:8d87bc453349 675 }
ninoderkinderen 0:8d87bc453349 676 #if SO_REUSE
ninoderkinderen 0:8d87bc453349 677 if ((pcb->so_options & SOF_REUSEADDR) != 0) {
ninoderkinderen 0:8d87bc453349 678 /* Since SOF_REUSEADDR allows reusing a local address, we have to make sure
ninoderkinderen 0:8d87bc453349 679 now that the 5-tuple is unique. */
ninoderkinderen 0:8d87bc453349 680 struct tcp_pcb *cpcb;
ninoderkinderen 0:8d87bc453349 681 int i;
ninoderkinderen 0:8d87bc453349 682 /* Don't check listen PCBs, check bound-, active- and TIME-WAIT PCBs. */
ninoderkinderen 0:8d87bc453349 683 for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
ninoderkinderen 0:8d87bc453349 684 for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
ninoderkinderen 0:8d87bc453349 685 if ((cpcb->local_port == pcb->local_port) &&
ninoderkinderen 0:8d87bc453349 686 (cpcb->remote_port == port) &&
ninoderkinderen 0:8d87bc453349 687 ip_addr_cmp(&cpcb->local_ip, &pcb->local_ip) &&
ninoderkinderen 0:8d87bc453349 688 ip_addr_cmp(&cpcb->remote_ip, ipaddr)) {
ninoderkinderen 0:8d87bc453349 689 /* linux returns EISCONN here, but ERR_USE should be OK for us */
ninoderkinderen 0:8d87bc453349 690 return ERR_USE;
ninoderkinderen 0:8d87bc453349 691 }
ninoderkinderen 0:8d87bc453349 692 }
ninoderkinderen 0:8d87bc453349 693 }
ninoderkinderen 0:8d87bc453349 694 }
ninoderkinderen 0:8d87bc453349 695 #endif /* SO_REUSE */
ninoderkinderen 0:8d87bc453349 696 iss = tcp_next_iss();
ninoderkinderen 0:8d87bc453349 697 pcb->rcv_nxt = 0;
ninoderkinderen 0:8d87bc453349 698 pcb->snd_nxt = iss;
ninoderkinderen 0:8d87bc453349 699 pcb->lastack = iss - 1;
ninoderkinderen 0:8d87bc453349 700 pcb->snd_lbb = iss - 1;
ninoderkinderen 0:8d87bc453349 701 pcb->rcv_wnd = TCP_WND;
ninoderkinderen 0:8d87bc453349 702 pcb->rcv_ann_wnd = TCP_WND;
ninoderkinderen 0:8d87bc453349 703 pcb->rcv_ann_right_edge = pcb->rcv_nxt;
ninoderkinderen 0:8d87bc453349 704 pcb->snd_wnd = TCP_WND;
ninoderkinderen 0:8d87bc453349 705 /* As initial send MSS, we use TCP_MSS but limit it to 536.
ninoderkinderen 0:8d87bc453349 706 The send MSS is updated when an MSS option is received. */
ninoderkinderen 0:8d87bc453349 707 pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
ninoderkinderen 0:8d87bc453349 708 #if TCP_CALCULATE_EFF_SEND_MSS
ninoderkinderen 0:8d87bc453349 709 pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr);
ninoderkinderen 0:8d87bc453349 710 #endif /* TCP_CALCULATE_EFF_SEND_MSS */
ninoderkinderen 0:8d87bc453349 711 pcb->cwnd = 1;
ninoderkinderen 0:8d87bc453349 712 pcb->ssthresh = pcb->mss * 10;
ninoderkinderen 0:8d87bc453349 713 #if LWIP_CALLBACK_API
ninoderkinderen 0:8d87bc453349 714 pcb->connected = connected;
ninoderkinderen 0:8d87bc453349 715 #else /* LWIP_CALLBACK_API */
ninoderkinderen 0:8d87bc453349 716 LWIP_UNUSED_ARG(connected);
ninoderkinderen 0:8d87bc453349 717 #endif /* LWIP_CALLBACK_API */
ninoderkinderen 0:8d87bc453349 718
ninoderkinderen 0:8d87bc453349 719 LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
ninoderkinderen 0:8d87bc453349 720
ninoderkinderen 0:8d87bc453349 721 /* Send a SYN together with the MSS option. */
ninoderkinderen 0:8d87bc453349 722 ret = tcp_enqueue_flags(pcb, TCP_SYN);
ninoderkinderen 0:8d87bc453349 723 if (ret == ERR_OK) {
ninoderkinderen 0:8d87bc453349 724 /* SYN segment was enqueued, changed the pcbs state now */
ninoderkinderen 0:8d87bc453349 725 pcb->state = SYN_SENT;
ninoderkinderen 0:8d87bc453349 726 TCP_RMV(&tcp_bound_pcbs, pcb);
ninoderkinderen 0:8d87bc453349 727 TCP_REG(&tcp_active_pcbs, pcb);
ninoderkinderen 0:8d87bc453349 728 snmp_inc_tcpactiveopens();
ninoderkinderen 0:8d87bc453349 729
ninoderkinderen 0:8d87bc453349 730 tcp_output(pcb);
ninoderkinderen 0:8d87bc453349 731 }
ninoderkinderen 0:8d87bc453349 732 return ret;
ninoderkinderen 0:8d87bc453349 733 }
ninoderkinderen 0:8d87bc453349 734
ninoderkinderen 0:8d87bc453349 735 /**
ninoderkinderen 0:8d87bc453349 736 * Called every 500 ms and implements the retransmission timer and the timer that
ninoderkinderen 0:8d87bc453349 737 * removes PCBs that have been in TIME-WAIT for enough time. It also increments
ninoderkinderen 0:8d87bc453349 738 * various timers such as the inactivity timer in each PCB.
ninoderkinderen 0:8d87bc453349 739 *
ninoderkinderen 0:8d87bc453349 740 * Automatically called from tcp_tmr().
ninoderkinderen 0:8d87bc453349 741 */
ninoderkinderen 0:8d87bc453349 742 void
ninoderkinderen 0:8d87bc453349 743 tcp_slowtmr(void)
ninoderkinderen 0:8d87bc453349 744 {
ninoderkinderen 0:8d87bc453349 745 struct tcp_pcb *pcb, *pcb2, *prev;
ninoderkinderen 0:8d87bc453349 746 u16_t eff_wnd;
ninoderkinderen 0:8d87bc453349 747 u8_t pcb_remove; /* flag if a PCB should be removed */
ninoderkinderen 0:8d87bc453349 748 u8_t pcb_reset; /* flag if a RST should be sent when removing */
ninoderkinderen 0:8d87bc453349 749 err_t err;
ninoderkinderen 0:8d87bc453349 750
ninoderkinderen 0:8d87bc453349 751 tcp_debug_print_pcbs(); //DG
ninoderkinderen 0:8d87bc453349 752
ninoderkinderen 0:8d87bc453349 753 err = ERR_OK;
ninoderkinderen 0:8d87bc453349 754
ninoderkinderen 0:8d87bc453349 755 ++tcp_ticks;
ninoderkinderen 0:8d87bc453349 756 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: tcp_ticks=%"U32_F"\n", tcp_ticks));
ninoderkinderen 0:8d87bc453349 757
ninoderkinderen 0:8d87bc453349 758 /* Steps through all of the active PCBs. */
ninoderkinderen 0:8d87bc453349 759 prev = NULL;
ninoderkinderen 0:8d87bc453349 760 pcb = tcp_active_pcbs;
ninoderkinderen 0:8d87bc453349 761 if (pcb == NULL) {
ninoderkinderen 0:8d87bc453349 762 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
ninoderkinderen 0:8d87bc453349 763 }
ninoderkinderen 0:8d87bc453349 764 while (pcb != NULL) {
ninoderkinderen 0:8d87bc453349 765 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
ninoderkinderen 0:8d87bc453349 766 LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
ninoderkinderen 0:8d87bc453349 767 LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
ninoderkinderen 0:8d87bc453349 768 LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
ninoderkinderen 0:8d87bc453349 769
ninoderkinderen 0:8d87bc453349 770 pcb_remove = 0;
ninoderkinderen 0:8d87bc453349 771 pcb_reset = 0;
ninoderkinderen 0:8d87bc453349 772
ninoderkinderen 0:8d87bc453349 773 if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
ninoderkinderen 0:8d87bc453349 774 ++pcb_remove;
ninoderkinderen 0:8d87bc453349 775 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
ninoderkinderen 0:8d87bc453349 776 }
ninoderkinderen 0:8d87bc453349 777 else if (pcb->nrtx == TCP_MAXRTX) {
ninoderkinderen 0:8d87bc453349 778 ++pcb_remove;
ninoderkinderen 0:8d87bc453349 779 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
ninoderkinderen 0:8d87bc453349 780 } else {
ninoderkinderen 0:8d87bc453349 781 if (pcb->persist_backoff > 0) {
ninoderkinderen 0:8d87bc453349 782 /* If snd_wnd is zero, use persist timer to send 1 byte probes
ninoderkinderen 0:8d87bc453349 783 * instead of using the standard retransmission mechanism. */
ninoderkinderen 0:8d87bc453349 784 pcb->persist_cnt++;
ninoderkinderen 0:8d87bc453349 785 if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) {
ninoderkinderen 0:8d87bc453349 786 pcb->persist_cnt = 0;
ninoderkinderen 0:8d87bc453349 787 if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
ninoderkinderen 0:8d87bc453349 788 pcb->persist_backoff++;
ninoderkinderen 0:8d87bc453349 789 }
ninoderkinderen 0:8d87bc453349 790 tcp_zero_window_probe(pcb);
ninoderkinderen 0:8d87bc453349 791 }
ninoderkinderen 0:8d87bc453349 792 } else {
ninoderkinderen 0:8d87bc453349 793 /* Increase the retransmission timer if it is running */
ninoderkinderen 0:8d87bc453349 794 if(pcb->rtime >= 0)
ninoderkinderen 0:8d87bc453349 795 ++pcb->rtime;
ninoderkinderen 0:8d87bc453349 796
ninoderkinderen 0:8d87bc453349 797 if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
ninoderkinderen 0:8d87bc453349 798 /* Time for a retransmission. */
ninoderkinderen 0:8d87bc453349 799 LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
ninoderkinderen 0:8d87bc453349 800 " pcb->rto %"S16_F"\n",
ninoderkinderen 0:8d87bc453349 801 pcb->rtime, pcb->rto));
ninoderkinderen 0:8d87bc453349 802
ninoderkinderen 0:8d87bc453349 803 /* Double retransmission time-out unless we are trying to
ninoderkinderen 0:8d87bc453349 804 * connect to somebody (i.e., we are in SYN_SENT). */
ninoderkinderen 0:8d87bc453349 805 if (pcb->state != SYN_SENT) {
ninoderkinderen 0:8d87bc453349 806 pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
ninoderkinderen 0:8d87bc453349 807 }
ninoderkinderen 0:8d87bc453349 808
ninoderkinderen 0:8d87bc453349 809 /* Reset the retransmission timer. */
ninoderkinderen 0:8d87bc453349 810 pcb->rtime = 0;
ninoderkinderen 0:8d87bc453349 811
ninoderkinderen 0:8d87bc453349 812 /* Reduce congestion window and ssthresh. */
ninoderkinderen 0:8d87bc453349 813 eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
ninoderkinderen 0:8d87bc453349 814 pcb->ssthresh = eff_wnd >> 1;
ninoderkinderen 0:8d87bc453349 815 if (pcb->ssthresh < (pcb->mss << 1)) {
ninoderkinderen 0:8d87bc453349 816 pcb->ssthresh = (pcb->mss << 1);
ninoderkinderen 0:8d87bc453349 817 }
ninoderkinderen 0:8d87bc453349 818 pcb->cwnd = pcb->mss;
ninoderkinderen 0:8d87bc453349 819 LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F
ninoderkinderen 0:8d87bc453349 820 " ssthresh %"U16_F"\n",
ninoderkinderen 0:8d87bc453349 821 pcb->cwnd, pcb->ssthresh));
ninoderkinderen 0:8d87bc453349 822
ninoderkinderen 0:8d87bc453349 823 /* The following needs to be called AFTER cwnd is set to one
ninoderkinderen 0:8d87bc453349 824 mss - STJ */
ninoderkinderen 0:8d87bc453349 825 tcp_rexmit_rto(pcb);
ninoderkinderen 0:8d87bc453349 826 }
ninoderkinderen 0:8d87bc453349 827 }
ninoderkinderen 0:8d87bc453349 828 }
ninoderkinderen 0:8d87bc453349 829 /* Check if this PCB has stayed too long in FIN-WAIT-2 */
ninoderkinderen 0:8d87bc453349 830 if (pcb->state == FIN_WAIT_2) {
ninoderkinderen 0:8d87bc453349 831 if ((u32_t)(tcp_ticks - pcb->tmr) >
ninoderkinderen 0:8d87bc453349 832 TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
ninoderkinderen 0:8d87bc453349 833 ++pcb_remove;
ninoderkinderen 0:8d87bc453349 834 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
ninoderkinderen 0:8d87bc453349 835 }
ninoderkinderen 0:8d87bc453349 836 }
ninoderkinderen 0:8d87bc453349 837
ninoderkinderen 0:8d87bc453349 838 /* Check if KEEPALIVE should be sent */
ninoderkinderen 0:8d87bc453349 839 if((pcb->so_options & SOF_KEEPALIVE) &&
ninoderkinderen 0:8d87bc453349 840 ((pcb->state == ESTABLISHED) ||
ninoderkinderen 0:8d87bc453349 841 (pcb->state == CLOSE_WAIT))) {
ninoderkinderen 0:8d87bc453349 842 #if LWIP_TCP_KEEPALIVE
ninoderkinderen 0:8d87bc453349 843 if((u32_t)(tcp_ticks - pcb->tmr) >
ninoderkinderen 0:8d87bc453349 844 (pcb->keep_idle + (pcb->keep_cnt*pcb->keep_intvl))
ninoderkinderen 0:8d87bc453349 845 / TCP_SLOW_INTERVAL)
ninoderkinderen 0:8d87bc453349 846 #else
ninoderkinderen 0:8d87bc453349 847 if((u32_t)(tcp_ticks - pcb->tmr) >
ninoderkinderen 0:8d87bc453349 848 (pcb->keep_idle + TCP_MAXIDLE) / TCP_SLOW_INTERVAL)
ninoderkinderen 0:8d87bc453349 849 #endif /* LWIP_TCP_KEEPALIVE */
ninoderkinderen 0:8d87bc453349 850 {
ninoderkinderen 0:8d87bc453349 851 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n",
ninoderkinderen 0:8d87bc453349 852 ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
ninoderkinderen 0:8d87bc453349 853 ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
ninoderkinderen 0:8d87bc453349 854
ninoderkinderen 0:8d87bc453349 855 ++pcb_remove;
ninoderkinderen 0:8d87bc453349 856 ++pcb_reset;
ninoderkinderen 0:8d87bc453349 857 }
ninoderkinderen 0:8d87bc453349 858 #if LWIP_TCP_KEEPALIVE
ninoderkinderen 0:8d87bc453349 859 else if((u32_t)(tcp_ticks - pcb->tmr) >
ninoderkinderen 0:8d87bc453349 860 (pcb->keep_idle + pcb->keep_cnt_sent * pcb->keep_intvl)
ninoderkinderen 0:8d87bc453349 861 / TCP_SLOW_INTERVAL)
ninoderkinderen 0:8d87bc453349 862 #else
ninoderkinderen 0:8d87bc453349 863 else if((u32_t)(tcp_ticks - pcb->tmr) >
ninoderkinderen 0:8d87bc453349 864 (pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEPINTVL_DEFAULT)
ninoderkinderen 0:8d87bc453349 865 / TCP_SLOW_INTERVAL)
ninoderkinderen 0:8d87bc453349 866 #endif /* LWIP_TCP_KEEPALIVE */
ninoderkinderen 0:8d87bc453349 867 {
ninoderkinderen 0:8d87bc453349 868 tcp_keepalive(pcb);
ninoderkinderen 0:8d87bc453349 869 pcb->keep_cnt_sent++;
ninoderkinderen 0:8d87bc453349 870 }
ninoderkinderen 0:8d87bc453349 871 }
ninoderkinderen 0:8d87bc453349 872
ninoderkinderen 0:8d87bc453349 873 /* If this PCB has queued out of sequence data, but has been
ninoderkinderen 0:8d87bc453349 874 inactive for too long, will drop the data (it will eventually
ninoderkinderen 0:8d87bc453349 875 be retransmitted). */
ninoderkinderen 0:8d87bc453349 876 #if TCP_QUEUE_OOSEQ
ninoderkinderen 0:8d87bc453349 877 if (pcb->ooseq != NULL &&
ninoderkinderen 0:8d87bc453349 878 (u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) {
ninoderkinderen 0:8d87bc453349 879 tcp_segs_free(pcb->ooseq);
ninoderkinderen 0:8d87bc453349 880 pcb->ooseq = NULL;
ninoderkinderen 0:8d87bc453349 881 LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
ninoderkinderen 0:8d87bc453349 882 }
ninoderkinderen 0:8d87bc453349 883 #endif /* TCP_QUEUE_OOSEQ */
ninoderkinderen 0:8d87bc453349 884
ninoderkinderen 0:8d87bc453349 885 /* Check if this PCB has stayed too long in SYN-RCVD */
ninoderkinderen 0:8d87bc453349 886 if (pcb->state == SYN_RCVD) {
ninoderkinderen 0:8d87bc453349 887 if ((u32_t)(tcp_ticks - pcb->tmr) >
ninoderkinderen 0:8d87bc453349 888 TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
ninoderkinderen 0:8d87bc453349 889 ++pcb_remove;
ninoderkinderen 0:8d87bc453349 890 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
ninoderkinderen 0:8d87bc453349 891 }
ninoderkinderen 0:8d87bc453349 892 }
ninoderkinderen 0:8d87bc453349 893
ninoderkinderen 0:8d87bc453349 894 /* Check if this PCB has stayed too long in LAST-ACK */
ninoderkinderen 0:8d87bc453349 895 if (pcb->state == LAST_ACK) {
ninoderkinderen 0:8d87bc453349 896 if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
ninoderkinderen 0:8d87bc453349 897 ++pcb_remove;
ninoderkinderen 0:8d87bc453349 898 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
ninoderkinderen 0:8d87bc453349 899 }
ninoderkinderen 0:8d87bc453349 900 }
ninoderkinderen 0:8d87bc453349 901
ninoderkinderen 0:8d87bc453349 902 /* If the PCB should be removed, do it. */
ninoderkinderen 0:8d87bc453349 903 if (pcb_remove) {
ninoderkinderen 0:8d87bc453349 904 tcp_pcb_purge(pcb);
ninoderkinderen 0:8d87bc453349 905 /* Remove PCB from tcp_active_pcbs list. */
ninoderkinderen 0:8d87bc453349 906 if (prev != NULL) {
ninoderkinderen 0:8d87bc453349 907 LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
ninoderkinderen 0:8d87bc453349 908 prev->next = pcb->next;
ninoderkinderen 0:8d87bc453349 909 } else {
ninoderkinderen 0:8d87bc453349 910 /* This PCB was the first. */
ninoderkinderen 0:8d87bc453349 911 LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
ninoderkinderen 0:8d87bc453349 912 tcp_active_pcbs = pcb->next;
ninoderkinderen 0:8d87bc453349 913 }
ninoderkinderen 0:8d87bc453349 914
ninoderkinderen 0:8d87bc453349 915 TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_ABRT);
ninoderkinderen 0:8d87bc453349 916 if (pcb_reset) {
ninoderkinderen 0:8d87bc453349 917 tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
ninoderkinderen 0:8d87bc453349 918 pcb->local_port, pcb->remote_port);
ninoderkinderen 0:8d87bc453349 919 }
ninoderkinderen 0:8d87bc453349 920
ninoderkinderen 0:8d87bc453349 921 pcb2 = pcb->next;
ninoderkinderen 0:8d87bc453349 922 memp_free(MEMP_TCP_PCB, pcb);
ninoderkinderen 0:8d87bc453349 923 pcb = pcb2;
ninoderkinderen 0:8d87bc453349 924 } else {
ninoderkinderen 0:8d87bc453349 925 /* get the 'next' element now and work with 'prev' below (in case of abort) */
ninoderkinderen 0:8d87bc453349 926 prev = pcb;
ninoderkinderen 0:8d87bc453349 927 pcb = pcb->next;
ninoderkinderen 0:8d87bc453349 928
ninoderkinderen 0:8d87bc453349 929 /* We check if we should poll the connection. */
ninoderkinderen 0:8d87bc453349 930 ++prev->polltmr;
ninoderkinderen 0:8d87bc453349 931 if (prev->polltmr >= prev->pollinterval) {
ninoderkinderen 0:8d87bc453349 932 prev->polltmr = 0;
ninoderkinderen 0:8d87bc453349 933 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
ninoderkinderen 0:8d87bc453349 934 TCP_EVENT_POLL(prev, err);
ninoderkinderen 0:8d87bc453349 935 /* if err == ERR_ABRT, 'prev' is already deallocated */
ninoderkinderen 0:8d87bc453349 936 if (err == ERR_OK) {
ninoderkinderen 0:8d87bc453349 937 tcp_output(prev);
ninoderkinderen 0:8d87bc453349 938 }
ninoderkinderen 0:8d87bc453349 939 }
ninoderkinderen 0:8d87bc453349 940 }
ninoderkinderen 0:8d87bc453349 941 }
ninoderkinderen 0:8d87bc453349 942
ninoderkinderen 0:8d87bc453349 943
ninoderkinderen 0:8d87bc453349 944 /* Steps through all of the TIME-WAIT PCBs. */
ninoderkinderen 0:8d87bc453349 945 prev = NULL;
ninoderkinderen 0:8d87bc453349 946 pcb = tcp_tw_pcbs;
ninoderkinderen 0:8d87bc453349 947 while (pcb != NULL) {
ninoderkinderen 0:8d87bc453349 948 LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
ninoderkinderen 0:8d87bc453349 949 pcb_remove = 0;
ninoderkinderen 0:8d87bc453349 950
ninoderkinderen 0:8d87bc453349 951 /* Check if this PCB has stayed long enough in TIME-WAIT */
ninoderkinderen 0:8d87bc453349 952 if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
ninoderkinderen 0:8d87bc453349 953 ++pcb_remove;
ninoderkinderen 0:8d87bc453349 954 }
ninoderkinderen 0:8d87bc453349 955
ninoderkinderen 0:8d87bc453349 956
ninoderkinderen 0:8d87bc453349 957
ninoderkinderen 0:8d87bc453349 958 /* If the PCB should be removed, do it. */
ninoderkinderen 0:8d87bc453349 959 if (pcb_remove) {
ninoderkinderen 0:8d87bc453349 960 tcp_pcb_purge(pcb);
ninoderkinderen 0:8d87bc453349 961 /* Remove PCB from tcp_tw_pcbs list. */
ninoderkinderen 0:8d87bc453349 962 if (prev != NULL) {
ninoderkinderen 0:8d87bc453349 963 LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
ninoderkinderen 0:8d87bc453349 964 prev->next = pcb->next;
ninoderkinderen 0:8d87bc453349 965 } else {
ninoderkinderen 0:8d87bc453349 966 /* This PCB was the first. */
ninoderkinderen 0:8d87bc453349 967 LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
ninoderkinderen 0:8d87bc453349 968 tcp_tw_pcbs = pcb->next;
ninoderkinderen 0:8d87bc453349 969 }
ninoderkinderen 0:8d87bc453349 970 pcb2 = pcb->next;
ninoderkinderen 0:8d87bc453349 971 memp_free(MEMP_TCP_PCB, pcb);
ninoderkinderen 0:8d87bc453349 972 pcb = pcb2;
ninoderkinderen 0:8d87bc453349 973 } else {
ninoderkinderen 0:8d87bc453349 974 prev = pcb;
ninoderkinderen 0:8d87bc453349 975 pcb = pcb->next;
ninoderkinderen 0:8d87bc453349 976 }
ninoderkinderen 0:8d87bc453349 977 }
ninoderkinderen 0:8d87bc453349 978 }
ninoderkinderen 0:8d87bc453349 979
ninoderkinderen 0:8d87bc453349 980 /**
ninoderkinderen 0:8d87bc453349 981 * Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
ninoderkinderen 0:8d87bc453349 982 * "refused" by upper layer (application) and sends delayed ACKs.
ninoderkinderen 0:8d87bc453349 983 *
ninoderkinderen 0:8d87bc453349 984 * Automatically called from tcp_tmr().
ninoderkinderen 0:8d87bc453349 985 */
ninoderkinderen 0:8d87bc453349 986 void
ninoderkinderen 0:8d87bc453349 987 tcp_fasttmr(void)
ninoderkinderen 0:8d87bc453349 988 {
ninoderkinderen 0:8d87bc453349 989 struct tcp_pcb *pcb = tcp_active_pcbs;
ninoderkinderen 0:8d87bc453349 990
ninoderkinderen 0:8d87bc453349 991 while(pcb != NULL) {
ninoderkinderen 0:8d87bc453349 992 struct tcp_pcb *next = pcb->next;
ninoderkinderen 0:8d87bc453349 993 /* If there is data which was previously "refused" by upper layer */
ninoderkinderen 0:8d87bc453349 994 if (pcb->refused_data != NULL) {
ninoderkinderen 0:8d87bc453349 995 /* Notify again application with data previously received. */
ninoderkinderen 0:8d87bc453349 996 err_t err;
ninoderkinderen 0:8d87bc453349 997 LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_fasttmr: notify kept packet\n"));
ninoderkinderen 0:8d87bc453349 998 TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
ninoderkinderen 0:8d87bc453349 999 if (err == ERR_OK) {
ninoderkinderen 0:8d87bc453349 1000 pcb->refused_data = NULL;
ninoderkinderen 0:8d87bc453349 1001 } else if (err == ERR_ABRT) {
ninoderkinderen 0:8d87bc453349 1002 /* if err == ERR_ABRT, 'pcb' is already deallocated */
ninoderkinderen 0:8d87bc453349 1003 pcb = NULL;
ninoderkinderen 0:8d87bc453349 1004 }
ninoderkinderen 0:8d87bc453349 1005 }
ninoderkinderen 0:8d87bc453349 1006
ninoderkinderen 0:8d87bc453349 1007 /* send delayed ACKs */
ninoderkinderen 0:8d87bc453349 1008 if (pcb && (pcb->flags & TF_ACK_DELAY)) {
ninoderkinderen 0:8d87bc453349 1009 LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
ninoderkinderen 0:8d87bc453349 1010 tcp_ack_now(pcb);
ninoderkinderen 0:8d87bc453349 1011 tcp_output(pcb);
ninoderkinderen 0:8d87bc453349 1012 pcb->flags &= ~(TF_ACK_DELAY | TF_ACK_NOW);
ninoderkinderen 0:8d87bc453349 1013 }
ninoderkinderen 0:8d87bc453349 1014
ninoderkinderen 0:8d87bc453349 1015 pcb = next;
ninoderkinderen 0:8d87bc453349 1016 }
ninoderkinderen 0:8d87bc453349 1017 }
ninoderkinderen 0:8d87bc453349 1018
ninoderkinderen 0:8d87bc453349 1019 /**
ninoderkinderen 0:8d87bc453349 1020 * Deallocates a list of TCP segments (tcp_seg structures).
ninoderkinderen 0:8d87bc453349 1021 *
ninoderkinderen 0:8d87bc453349 1022 * @param seg tcp_seg list of TCP segments to free
ninoderkinderen 0:8d87bc453349 1023 */
ninoderkinderen 0:8d87bc453349 1024 void
ninoderkinderen 0:8d87bc453349 1025 tcp_segs_free(struct tcp_seg *seg)
ninoderkinderen 0:8d87bc453349 1026 {
ninoderkinderen 0:8d87bc453349 1027 while (seg != NULL) {
ninoderkinderen 0:8d87bc453349 1028 struct tcp_seg *next = seg->next;
ninoderkinderen 0:8d87bc453349 1029 tcp_seg_free(seg);
ninoderkinderen 0:8d87bc453349 1030 seg = next;
ninoderkinderen 0:8d87bc453349 1031 }
ninoderkinderen 0:8d87bc453349 1032 }
ninoderkinderen 0:8d87bc453349 1033
ninoderkinderen 0:8d87bc453349 1034 /**
ninoderkinderen 0:8d87bc453349 1035 * Frees a TCP segment (tcp_seg structure).
ninoderkinderen 0:8d87bc453349 1036 *
ninoderkinderen 0:8d87bc453349 1037 * @param seg single tcp_seg to free
ninoderkinderen 0:8d87bc453349 1038 */
ninoderkinderen 0:8d87bc453349 1039 void
ninoderkinderen 0:8d87bc453349 1040 tcp_seg_free(struct tcp_seg *seg)
ninoderkinderen 0:8d87bc453349 1041 {
ninoderkinderen 0:8d87bc453349 1042 if (seg != NULL) {
ninoderkinderen 0:8d87bc453349 1043 if (seg->p != NULL) {
ninoderkinderen 0:8d87bc453349 1044 pbuf_free(seg->p);
ninoderkinderen 0:8d87bc453349 1045 #if TCP_DEBUG
ninoderkinderen 0:8d87bc453349 1046 seg->p = NULL;
ninoderkinderen 0:8d87bc453349 1047 #endif /* TCP_DEBUG */
ninoderkinderen 0:8d87bc453349 1048 }
ninoderkinderen 0:8d87bc453349 1049 memp_free(MEMP_TCP_SEG, seg);
ninoderkinderen 0:8d87bc453349 1050 }
ninoderkinderen 0:8d87bc453349 1051 }
ninoderkinderen 0:8d87bc453349 1052
ninoderkinderen 0:8d87bc453349 1053 /**
ninoderkinderen 0:8d87bc453349 1054 * Sets the priority of a connection.
ninoderkinderen 0:8d87bc453349 1055 *
ninoderkinderen 0:8d87bc453349 1056 * @param pcb the tcp_pcb to manipulate
ninoderkinderen 0:8d87bc453349 1057 * @param prio new priority
ninoderkinderen 0:8d87bc453349 1058 */
ninoderkinderen 0:8d87bc453349 1059 void
ninoderkinderen 0:8d87bc453349 1060 tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
ninoderkinderen 0:8d87bc453349 1061 {
ninoderkinderen 0:8d87bc453349 1062 pcb->prio = prio;
ninoderkinderen 0:8d87bc453349 1063 }
ninoderkinderen 0:8d87bc453349 1064
ninoderkinderen 0:8d87bc453349 1065 #if TCP_QUEUE_OOSEQ
ninoderkinderen 0:8d87bc453349 1066 /**
ninoderkinderen 0:8d87bc453349 1067 * Returns a copy of the given TCP segment.
ninoderkinderen 0:8d87bc453349 1068 * The pbuf and data are not copied, only the pointers
ninoderkinderen 0:8d87bc453349 1069 *
ninoderkinderen 0:8d87bc453349 1070 * @param seg the old tcp_seg
ninoderkinderen 0:8d87bc453349 1071 * @return a copy of seg
ninoderkinderen 0:8d87bc453349 1072 */
ninoderkinderen 0:8d87bc453349 1073 struct tcp_seg *
ninoderkinderen 0:8d87bc453349 1074 tcp_seg_copy(struct tcp_seg *seg)
ninoderkinderen 0:8d87bc453349 1075 {
ninoderkinderen 0:8d87bc453349 1076 struct tcp_seg *cseg;
ninoderkinderen 0:8d87bc453349 1077
ninoderkinderen 0:8d87bc453349 1078 cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG);
ninoderkinderen 0:8d87bc453349 1079 if (cseg == NULL) {
ninoderkinderen 0:8d87bc453349 1080 return NULL;
ninoderkinderen 0:8d87bc453349 1081 }
ninoderkinderen 0:8d87bc453349 1082 SMEMCPY((u8_t *)cseg, (const u8_t *)seg, sizeof(struct tcp_seg));
ninoderkinderen 0:8d87bc453349 1083 pbuf_ref(cseg->p);
ninoderkinderen 0:8d87bc453349 1084 return cseg;
ninoderkinderen 0:8d87bc453349 1085 }
ninoderkinderen 0:8d87bc453349 1086 #endif /* TCP_QUEUE_OOSEQ */
ninoderkinderen 0:8d87bc453349 1087
ninoderkinderen 0:8d87bc453349 1088 #if LWIP_CALLBACK_API
ninoderkinderen 0:8d87bc453349 1089 /**
ninoderkinderen 0:8d87bc453349 1090 * Default receive callback that is called if the user didn't register
ninoderkinderen 0:8d87bc453349 1091 * a recv callback for the pcb.
ninoderkinderen 0:8d87bc453349 1092 */
ninoderkinderen 0:8d87bc453349 1093 err_t
ninoderkinderen 0:8d87bc453349 1094 tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
ninoderkinderen 0:8d87bc453349 1095 {
ninoderkinderen 0:8d87bc453349 1096 LWIP_UNUSED_ARG(arg);
ninoderkinderen 0:8d87bc453349 1097 if (p != NULL) {
ninoderkinderen 0:8d87bc453349 1098 tcp_recved(pcb, p->tot_len);
ninoderkinderen 0:8d87bc453349 1099 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 1100 } else if (err == ERR_OK) {
ninoderkinderen 0:8d87bc453349 1101 return tcp_close(pcb);
ninoderkinderen 0:8d87bc453349 1102 }
ninoderkinderen 0:8d87bc453349 1103 return ERR_OK;
ninoderkinderen 0:8d87bc453349 1104 }
ninoderkinderen 0:8d87bc453349 1105 #endif /* LWIP_CALLBACK_API */
ninoderkinderen 0:8d87bc453349 1106
ninoderkinderen 0:8d87bc453349 1107 /**
ninoderkinderen 0:8d87bc453349 1108 * Kills the oldest active connection that has lower priority than prio.
ninoderkinderen 0:8d87bc453349 1109 *
ninoderkinderen 0:8d87bc453349 1110 * @param prio minimum priority
ninoderkinderen 0:8d87bc453349 1111 */
ninoderkinderen 0:8d87bc453349 1112 static void
ninoderkinderen 0:8d87bc453349 1113 tcp_kill_prio(u8_t prio)
ninoderkinderen 0:8d87bc453349 1114 {
ninoderkinderen 0:8d87bc453349 1115 struct tcp_pcb *pcb, *inactive;
ninoderkinderen 0:8d87bc453349 1116 u32_t inactivity;
ninoderkinderen 0:8d87bc453349 1117 u8_t mprio;
ninoderkinderen 0:8d87bc453349 1118
ninoderkinderen 0:8d87bc453349 1119
ninoderkinderen 0:8d87bc453349 1120 mprio = TCP_PRIO_MAX;
ninoderkinderen 0:8d87bc453349 1121
ninoderkinderen 0:8d87bc453349 1122 /* We kill the oldest active connection that has lower priority than prio. */
ninoderkinderen 0:8d87bc453349 1123 inactivity = 0;
ninoderkinderen 0:8d87bc453349 1124 inactive = NULL;
ninoderkinderen 0:8d87bc453349 1125 for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
ninoderkinderen 0:8d87bc453349 1126 if (pcb->prio <= prio &&
ninoderkinderen 0:8d87bc453349 1127 pcb->prio <= mprio &&
ninoderkinderen 0:8d87bc453349 1128 (u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
ninoderkinderen 0:8d87bc453349 1129 inactivity = tcp_ticks - pcb->tmr;
ninoderkinderen 0:8d87bc453349 1130 inactive = pcb;
ninoderkinderen 0:8d87bc453349 1131 mprio = pcb->prio;
ninoderkinderen 0:8d87bc453349 1132 }
ninoderkinderen 0:8d87bc453349 1133 }
ninoderkinderen 0:8d87bc453349 1134 if (inactive != NULL) {
ninoderkinderen 0:8d87bc453349 1135 LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n",
ninoderkinderen 0:8d87bc453349 1136 (void *)inactive, inactivity));
ninoderkinderen 0:8d87bc453349 1137 tcp_abort(inactive);
ninoderkinderen 0:8d87bc453349 1138 }
ninoderkinderen 0:8d87bc453349 1139 }
ninoderkinderen 0:8d87bc453349 1140
ninoderkinderen 0:8d87bc453349 1141 /**
ninoderkinderen 0:8d87bc453349 1142 * Kills the oldest connection that is in TIME_WAIT state.
ninoderkinderen 0:8d87bc453349 1143 * Called from tcp_alloc() if no more connections are available.
ninoderkinderen 0:8d87bc453349 1144 */
ninoderkinderen 0:8d87bc453349 1145 static void
ninoderkinderen 0:8d87bc453349 1146 tcp_kill_timewait(void)
ninoderkinderen 0:8d87bc453349 1147 {
ninoderkinderen 0:8d87bc453349 1148 struct tcp_pcb *pcb, *inactive;
ninoderkinderen 0:8d87bc453349 1149 u32_t inactivity;
ninoderkinderen 0:8d87bc453349 1150
ninoderkinderen 0:8d87bc453349 1151 inactivity = 0;
ninoderkinderen 0:8d87bc453349 1152 inactive = NULL;
ninoderkinderen 0:8d87bc453349 1153 /* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
ninoderkinderen 0:8d87bc453349 1154 for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
ninoderkinderen 0:8d87bc453349 1155 if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
ninoderkinderen 0:8d87bc453349 1156 inactivity = tcp_ticks - pcb->tmr;
ninoderkinderen 0:8d87bc453349 1157 inactive = pcb;
ninoderkinderen 0:8d87bc453349 1158 }
ninoderkinderen 0:8d87bc453349 1159 }
ninoderkinderen 0:8d87bc453349 1160 if (inactive != NULL) {
ninoderkinderen 0:8d87bc453349 1161 LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n",
ninoderkinderen 0:8d87bc453349 1162 (void *)inactive, inactivity));
ninoderkinderen 0:8d87bc453349 1163 tcp_abort(inactive);
ninoderkinderen 0:8d87bc453349 1164 }
ninoderkinderen 0:8d87bc453349 1165 }
ninoderkinderen 0:8d87bc453349 1166
ninoderkinderen 0:8d87bc453349 1167 /**
ninoderkinderen 0:8d87bc453349 1168 * Allocate a new tcp_pcb structure.
ninoderkinderen 0:8d87bc453349 1169 *
ninoderkinderen 0:8d87bc453349 1170 * @param prio priority for the new pcb
ninoderkinderen 0:8d87bc453349 1171 * @return a new tcp_pcb that initially is in state CLOSED
ninoderkinderen 0:8d87bc453349 1172 */
ninoderkinderen 0:8d87bc453349 1173 struct tcp_pcb *
ninoderkinderen 0:8d87bc453349 1174 tcp_alloc(u8_t prio)
ninoderkinderen 0:8d87bc453349 1175 {
ninoderkinderen 0:8d87bc453349 1176 struct tcp_pcb *pcb;
ninoderkinderen 0:8d87bc453349 1177 u32_t iss;
ninoderkinderen 0:8d87bc453349 1178
ninoderkinderen 0:8d87bc453349 1179 pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
ninoderkinderen 0:8d87bc453349 1180 if (pcb == NULL) {
ninoderkinderen 0:8d87bc453349 1181 /* Try killing oldest connection in TIME-WAIT. */
ninoderkinderen 0:8d87bc453349 1182 LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
ninoderkinderen 0:8d87bc453349 1183 tcp_kill_timewait();
ninoderkinderen 0:8d87bc453349 1184 /* Try to allocate a tcp_pcb again. */
ninoderkinderen 0:8d87bc453349 1185 pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
ninoderkinderen 0:8d87bc453349 1186 if (pcb == NULL) {
ninoderkinderen 0:8d87bc453349 1187 /* Try killing active connections with lower priority than the new one. */
ninoderkinderen 0:8d87bc453349 1188 LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing connection with prio lower than %d\n", prio));
ninoderkinderen 0:8d87bc453349 1189 tcp_kill_prio(prio);
ninoderkinderen 0:8d87bc453349 1190 /* Try to allocate a tcp_pcb again. */
ninoderkinderen 0:8d87bc453349 1191 pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
ninoderkinderen 0:8d87bc453349 1192 if (pcb != NULL) {
ninoderkinderen 0:8d87bc453349 1193 /* adjust err stats: memp_malloc failed twice before */
ninoderkinderen 0:8d87bc453349 1194 MEMP_STATS_DEC(err, MEMP_TCP_PCB);
ninoderkinderen 0:8d87bc453349 1195 }
ninoderkinderen 0:8d87bc453349 1196 }
ninoderkinderen 0:8d87bc453349 1197 if (pcb != NULL) {
ninoderkinderen 0:8d87bc453349 1198 /* adjust err stats: timewait PCB was freed above */
ninoderkinderen 0:8d87bc453349 1199 MEMP_STATS_DEC(err, MEMP_TCP_PCB);
ninoderkinderen 0:8d87bc453349 1200 }
ninoderkinderen 0:8d87bc453349 1201 }
ninoderkinderen 0:8d87bc453349 1202 if (pcb != NULL) {
ninoderkinderen 0:8d87bc453349 1203 memset(pcb, 0, sizeof(struct tcp_pcb));
ninoderkinderen 0:8d87bc453349 1204 pcb->prio = prio;
ninoderkinderen 0:8d87bc453349 1205 pcb->snd_buf = TCP_SND_BUF;
ninoderkinderen 0:8d87bc453349 1206 pcb->snd_queuelen = 0;
ninoderkinderen 0:8d87bc453349 1207 pcb->rcv_wnd = TCP_WND;
ninoderkinderen 0:8d87bc453349 1208 pcb->rcv_ann_wnd = TCP_WND;
ninoderkinderen 0:8d87bc453349 1209 pcb->tos = 0;
ninoderkinderen 0:8d87bc453349 1210 pcb->ttl = TCP_TTL;
ninoderkinderen 0:8d87bc453349 1211 /* As initial send MSS, we use TCP_MSS but limit it to 536.
ninoderkinderen 0:8d87bc453349 1212 The send MSS is updated when an MSS option is received. */
ninoderkinderen 0:8d87bc453349 1213 pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
ninoderkinderen 0:8d87bc453349 1214 pcb->rto = 3000 / TCP_SLOW_INTERVAL;
ninoderkinderen 0:8d87bc453349 1215 pcb->sa = 0;
ninoderkinderen 0:8d87bc453349 1216 pcb->sv = 3000 / TCP_SLOW_INTERVAL;
ninoderkinderen 0:8d87bc453349 1217 pcb->rtime = -1;
ninoderkinderen 0:8d87bc453349 1218 pcb->cwnd = 1;
ninoderkinderen 0:8d87bc453349 1219 iss = tcp_next_iss();
ninoderkinderen 0:8d87bc453349 1220 pcb->snd_wl2 = iss;
ninoderkinderen 0:8d87bc453349 1221 pcb->snd_nxt = iss;
ninoderkinderen 0:8d87bc453349 1222 pcb->lastack = iss;
ninoderkinderen 0:8d87bc453349 1223 pcb->snd_lbb = iss;
ninoderkinderen 0:8d87bc453349 1224 pcb->tmr = tcp_ticks;
ninoderkinderen 0:8d87bc453349 1225
ninoderkinderen 0:8d87bc453349 1226 LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
ninoderkinderen 0:8d87bc453349 1227
ninoderkinderen 0:8d87bc453349 1228 pcb->polltmr = 0;
ninoderkinderen 0:8d87bc453349 1229
ninoderkinderen 0:8d87bc453349 1230 #if LWIP_CALLBACK_API
ninoderkinderen 0:8d87bc453349 1231 pcb->recv = tcp_recv_null;
ninoderkinderen 0:8d87bc453349 1232 #endif /* LWIP_CALLBACK_API */
ninoderkinderen 0:8d87bc453349 1233
ninoderkinderen 0:8d87bc453349 1234 /* Init KEEPALIVE timer */
ninoderkinderen 0:8d87bc453349 1235 pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
ninoderkinderen 0:8d87bc453349 1236
ninoderkinderen 0:8d87bc453349 1237 #if LWIP_TCP_KEEPALIVE
ninoderkinderen 0:8d87bc453349 1238 pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
ninoderkinderen 0:8d87bc453349 1239 pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
ninoderkinderen 0:8d87bc453349 1240 #endif /* LWIP_TCP_KEEPALIVE */
ninoderkinderen 0:8d87bc453349 1241
ninoderkinderen 0:8d87bc453349 1242 pcb->keep_cnt_sent = 0;
ninoderkinderen 0:8d87bc453349 1243 }
ninoderkinderen 0:8d87bc453349 1244 return pcb;
ninoderkinderen 0:8d87bc453349 1245 }
ninoderkinderen 0:8d87bc453349 1246
ninoderkinderen 0:8d87bc453349 1247 /**
ninoderkinderen 0:8d87bc453349 1248 * Creates a new TCP protocol control block but doesn't place it on
ninoderkinderen 0:8d87bc453349 1249 * any of the TCP PCB lists.
ninoderkinderen 0:8d87bc453349 1250 * The pcb is not put on any list until binding using tcp_bind().
ninoderkinderen 0:8d87bc453349 1251 *
ninoderkinderen 0:8d87bc453349 1252 * @internal: Maybe there should be a idle TCP PCB list where these
ninoderkinderen 0:8d87bc453349 1253 * PCBs are put on. Port reservation using tcp_bind() is implemented but
ninoderkinderen 0:8d87bc453349 1254 * allocated pcbs that are not bound can't be killed automatically if wanting
ninoderkinderen 0:8d87bc453349 1255 * to allocate a pcb with higher prio (@see tcp_kill_prio())
ninoderkinderen 0:8d87bc453349 1256 *
ninoderkinderen 0:8d87bc453349 1257 * @return a new tcp_pcb that initially is in state CLOSED
ninoderkinderen 0:8d87bc453349 1258 */
ninoderkinderen 0:8d87bc453349 1259 struct tcp_pcb *
ninoderkinderen 0:8d87bc453349 1260 tcp_new(void)
ninoderkinderen 0:8d87bc453349 1261 {
ninoderkinderen 0:8d87bc453349 1262 return tcp_alloc(TCP_PRIO_NORMAL);
ninoderkinderen 0:8d87bc453349 1263 }
ninoderkinderen 0:8d87bc453349 1264
ninoderkinderen 0:8d87bc453349 1265 /**
ninoderkinderen 0:8d87bc453349 1266 * Used to specify the argument that should be passed callback
ninoderkinderen 0:8d87bc453349 1267 * functions.
ninoderkinderen 0:8d87bc453349 1268 *
ninoderkinderen 0:8d87bc453349 1269 * @param pcb tcp_pcb to set the callback argument
ninoderkinderen 0:8d87bc453349 1270 * @param arg void pointer argument to pass to callback functions
ninoderkinderen 0:8d87bc453349 1271 */
ninoderkinderen 0:8d87bc453349 1272 void
ninoderkinderen 0:8d87bc453349 1273 tcp_arg(struct tcp_pcb *pcb, void *arg)
ninoderkinderen 0:8d87bc453349 1274 {
ninoderkinderen 0:8d87bc453349 1275 pcb->callback_arg = arg;
ninoderkinderen 0:8d87bc453349 1276 }
ninoderkinderen 0:8d87bc453349 1277 #if LWIP_CALLBACK_API
ninoderkinderen 0:8d87bc453349 1278
ninoderkinderen 0:8d87bc453349 1279 /**
ninoderkinderen 0:8d87bc453349 1280 * Used to specify the function that should be called when a TCP
ninoderkinderen 0:8d87bc453349 1281 * connection receives data.
ninoderkinderen 0:8d87bc453349 1282 *
ninoderkinderen 0:8d87bc453349 1283 * @param pcb tcp_pcb to set the recv callback
ninoderkinderen 0:8d87bc453349 1284 * @param recv callback function to call for this pcb when data is received
ninoderkinderen 0:8d87bc453349 1285 */
ninoderkinderen 0:8d87bc453349 1286 void
ninoderkinderen 0:8d87bc453349 1287 tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
ninoderkinderen 0:8d87bc453349 1288 {
ninoderkinderen 0:8d87bc453349 1289 pcb->recv = recv;
ninoderkinderen 0:8d87bc453349 1290 }
ninoderkinderen 0:8d87bc453349 1291
ninoderkinderen 0:8d87bc453349 1292 /**
ninoderkinderen 0:8d87bc453349 1293 * Used to specify the function that should be called when TCP data
ninoderkinderen 0:8d87bc453349 1294 * has been successfully delivered to the remote host.
ninoderkinderen 0:8d87bc453349 1295 *
ninoderkinderen 0:8d87bc453349 1296 * @param pcb tcp_pcb to set the sent callback
ninoderkinderen 0:8d87bc453349 1297 * @param sent callback function to call for this pcb when data is successfully sent
ninoderkinderen 0:8d87bc453349 1298 */
ninoderkinderen 0:8d87bc453349 1299 void
ninoderkinderen 0:8d87bc453349 1300 tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
ninoderkinderen 0:8d87bc453349 1301 {
ninoderkinderen 0:8d87bc453349 1302 pcb->sent = sent;
ninoderkinderen 0:8d87bc453349 1303 }
ninoderkinderen 0:8d87bc453349 1304
ninoderkinderen 0:8d87bc453349 1305 /**
ninoderkinderen 0:8d87bc453349 1306 * Used to specify the function that should be called when a fatal error
ninoderkinderen 0:8d87bc453349 1307 * has occured on the connection.
ninoderkinderen 0:8d87bc453349 1308 *
ninoderkinderen 0:8d87bc453349 1309 * @param pcb tcp_pcb to set the err callback
ninoderkinderen 0:8d87bc453349 1310 * @param err callback function to call for this pcb when a fatal error
ninoderkinderen 0:8d87bc453349 1311 * has occured on the connection
ninoderkinderen 0:8d87bc453349 1312 */
ninoderkinderen 0:8d87bc453349 1313 void
ninoderkinderen 0:8d87bc453349 1314 tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
ninoderkinderen 0:8d87bc453349 1315 {
ninoderkinderen 0:8d87bc453349 1316 pcb->errf = err;
ninoderkinderen 0:8d87bc453349 1317 }
ninoderkinderen 0:8d87bc453349 1318
ninoderkinderen 0:8d87bc453349 1319 /**
ninoderkinderen 0:8d87bc453349 1320 * Used for specifying the function that should be called when a
ninoderkinderen 0:8d87bc453349 1321 * LISTENing connection has been connected to another host.
ninoderkinderen 0:8d87bc453349 1322 *
ninoderkinderen 0:8d87bc453349 1323 * @param pcb tcp_pcb to set the accept callback
ninoderkinderen 0:8d87bc453349 1324 * @param accept callback function to call for this pcb when LISTENing
ninoderkinderen 0:8d87bc453349 1325 * connection has been connected to another host
ninoderkinderen 0:8d87bc453349 1326 */
ninoderkinderen 0:8d87bc453349 1327 void
ninoderkinderen 0:8d87bc453349 1328 tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
ninoderkinderen 0:8d87bc453349 1329 {
ninoderkinderen 0:8d87bc453349 1330 pcb->accept = accept;
ninoderkinderen 0:8d87bc453349 1331 }
ninoderkinderen 0:8d87bc453349 1332 #endif /* LWIP_CALLBACK_API */
ninoderkinderen 0:8d87bc453349 1333
ninoderkinderen 0:8d87bc453349 1334
ninoderkinderen 0:8d87bc453349 1335 /**
ninoderkinderen 0:8d87bc453349 1336 * Used to specify the function that should be called periodically
ninoderkinderen 0:8d87bc453349 1337 * from TCP. The interval is specified in terms of the TCP coarse
ninoderkinderen 0:8d87bc453349 1338 * timer interval, which is called twice a second.
ninoderkinderen 0:8d87bc453349 1339 *
ninoderkinderen 0:8d87bc453349 1340 */
ninoderkinderen 0:8d87bc453349 1341 void
ninoderkinderen 0:8d87bc453349 1342 tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
ninoderkinderen 0:8d87bc453349 1343 {
ninoderkinderen 0:8d87bc453349 1344 #if LWIP_CALLBACK_API
ninoderkinderen 0:8d87bc453349 1345 pcb->poll = poll;
ninoderkinderen 0:8d87bc453349 1346 #else /* LWIP_CALLBACK_API */
ninoderkinderen 0:8d87bc453349 1347 LWIP_UNUSED_ARG(poll);
ninoderkinderen 0:8d87bc453349 1348 #endif /* LWIP_CALLBACK_API */
ninoderkinderen 0:8d87bc453349 1349 pcb->pollinterval = interval;
ninoderkinderen 0:8d87bc453349 1350 }
ninoderkinderen 0:8d87bc453349 1351
ninoderkinderen 0:8d87bc453349 1352 /**
ninoderkinderen 0:8d87bc453349 1353 * Purges a TCP PCB. Removes any buffered data and frees the buffer memory
ninoderkinderen 0:8d87bc453349 1354 * (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
ninoderkinderen 0:8d87bc453349 1355 *
ninoderkinderen 0:8d87bc453349 1356 * @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
ninoderkinderen 0:8d87bc453349 1357 */
ninoderkinderen 0:8d87bc453349 1358 void
ninoderkinderen 0:8d87bc453349 1359 tcp_pcb_purge(struct tcp_pcb *pcb)
ninoderkinderen 0:8d87bc453349 1360 {
ninoderkinderen 0:8d87bc453349 1361 if (pcb->state != CLOSED &&
ninoderkinderen 0:8d87bc453349 1362 pcb->state != TIME_WAIT &&
ninoderkinderen 0:8d87bc453349 1363 pcb->state != LISTEN) {
ninoderkinderen 0:8d87bc453349 1364
ninoderkinderen 0:8d87bc453349 1365 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
ninoderkinderen 0:8d87bc453349 1366
ninoderkinderen 0:8d87bc453349 1367 #if TCP_LISTEN_BACKLOG
ninoderkinderen 0:8d87bc453349 1368 if (pcb->state == SYN_RCVD) {
ninoderkinderen 0:8d87bc453349 1369 /* Need to find the corresponding listen_pcb and decrease its accepts_pending */
ninoderkinderen 0:8d87bc453349 1370 struct tcp_pcb_listen *lpcb;
ninoderkinderen 0:8d87bc453349 1371 LWIP_ASSERT("tcp_pcb_purge: pcb->state == SYN_RCVD but tcp_listen_pcbs is NULL",
ninoderkinderen 0:8d87bc453349 1372 tcp_listen_pcbs.listen_pcbs != NULL);
ninoderkinderen 0:8d87bc453349 1373 for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
ninoderkinderen 0:8d87bc453349 1374 if ((lpcb->local_port == pcb->local_port) &&
ninoderkinderen 0:8d87bc453349 1375 (ip_addr_isany(&lpcb->local_ip) ||
ninoderkinderen 0:8d87bc453349 1376 ip_addr_cmp(&pcb->local_ip, &lpcb->local_ip))) {
ninoderkinderen 0:8d87bc453349 1377 /* port and address of the listen pcb match the timed-out pcb */
ninoderkinderen 0:8d87bc453349 1378 LWIP_ASSERT("tcp_pcb_purge: listen pcb does not have accepts pending",
ninoderkinderen 0:8d87bc453349 1379 lpcb->accepts_pending > 0);
ninoderkinderen 0:8d87bc453349 1380 lpcb->accepts_pending--;
ninoderkinderen 0:8d87bc453349 1381 break;
ninoderkinderen 0:8d87bc453349 1382 }
ninoderkinderen 0:8d87bc453349 1383 }
ninoderkinderen 0:8d87bc453349 1384 }
ninoderkinderen 0:8d87bc453349 1385 #endif /* TCP_LISTEN_BACKLOG */
ninoderkinderen 0:8d87bc453349 1386
ninoderkinderen 0:8d87bc453349 1387
ninoderkinderen 0:8d87bc453349 1388 if (pcb->refused_data != NULL) {
ninoderkinderen 0:8d87bc453349 1389 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
ninoderkinderen 0:8d87bc453349 1390 pbuf_free(pcb->refused_data);
ninoderkinderen 0:8d87bc453349 1391 pcb->refused_data = NULL;
ninoderkinderen 0:8d87bc453349 1392 }
ninoderkinderen 0:8d87bc453349 1393 if (pcb->unsent != NULL) {
ninoderkinderen 0:8d87bc453349 1394 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
ninoderkinderen 0:8d87bc453349 1395 }
ninoderkinderen 0:8d87bc453349 1396 if (pcb->unacked != NULL) {
ninoderkinderen 0:8d87bc453349 1397 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
ninoderkinderen 0:8d87bc453349 1398 }
ninoderkinderen 0:8d87bc453349 1399 #if TCP_QUEUE_OOSEQ
ninoderkinderen 0:8d87bc453349 1400 if (pcb->ooseq != NULL) {
ninoderkinderen 0:8d87bc453349 1401 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
ninoderkinderen 0:8d87bc453349 1402 }
ninoderkinderen 0:8d87bc453349 1403 tcp_segs_free(pcb->ooseq);
ninoderkinderen 0:8d87bc453349 1404 pcb->ooseq = NULL;
ninoderkinderen 0:8d87bc453349 1405 #endif /* TCP_QUEUE_OOSEQ */
ninoderkinderen 0:8d87bc453349 1406
ninoderkinderen 0:8d87bc453349 1407 /* Stop the retransmission timer as it will expect data on unacked
ninoderkinderen 0:8d87bc453349 1408 queue if it fires */
ninoderkinderen 0:8d87bc453349 1409 pcb->rtime = -1;
ninoderkinderen 0:8d87bc453349 1410
ninoderkinderen 0:8d87bc453349 1411 tcp_segs_free(pcb->unsent);
ninoderkinderen 0:8d87bc453349 1412 tcp_segs_free(pcb->unacked);
ninoderkinderen 0:8d87bc453349 1413 pcb->unacked = pcb->unsent = NULL;
ninoderkinderen 0:8d87bc453349 1414 #if TCP_OVERSIZE
ninoderkinderen 0:8d87bc453349 1415 pcb->unsent_oversize = 0;
ninoderkinderen 0:8d87bc453349 1416 #endif /* TCP_OVERSIZE */
ninoderkinderen 0:8d87bc453349 1417 }
ninoderkinderen 0:8d87bc453349 1418 }
ninoderkinderen 0:8d87bc453349 1419
ninoderkinderen 0:8d87bc453349 1420 /**
ninoderkinderen 0:8d87bc453349 1421 * Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
ninoderkinderen 0:8d87bc453349 1422 *
ninoderkinderen 0:8d87bc453349 1423 * @param pcblist PCB list to purge.
ninoderkinderen 0:8d87bc453349 1424 * @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
ninoderkinderen 0:8d87bc453349 1425 */
ninoderkinderen 0:8d87bc453349 1426 void
ninoderkinderen 0:8d87bc453349 1427 tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb)
ninoderkinderen 0:8d87bc453349 1428 {
ninoderkinderen 0:8d87bc453349 1429 TCP_RMV(pcblist, pcb);
ninoderkinderen 0:8d87bc453349 1430
ninoderkinderen 0:8d87bc453349 1431 tcp_pcb_purge(pcb);
ninoderkinderen 0:8d87bc453349 1432
ninoderkinderen 0:8d87bc453349 1433 /* if there is an outstanding delayed ACKs, send it */
ninoderkinderen 0:8d87bc453349 1434 if (pcb->state != TIME_WAIT &&
ninoderkinderen 0:8d87bc453349 1435 pcb->state != LISTEN &&
ninoderkinderen 0:8d87bc453349 1436 pcb->flags & TF_ACK_DELAY) {
ninoderkinderen 0:8d87bc453349 1437 pcb->flags |= TF_ACK_NOW;
ninoderkinderen 0:8d87bc453349 1438 tcp_output(pcb);
ninoderkinderen 0:8d87bc453349 1439 }
ninoderkinderen 0:8d87bc453349 1440
ninoderkinderen 0:8d87bc453349 1441 if (pcb->state != LISTEN) {
ninoderkinderen 0:8d87bc453349 1442 LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
ninoderkinderen 0:8d87bc453349 1443 LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
ninoderkinderen 0:8d87bc453349 1444 #if TCP_QUEUE_OOSEQ
ninoderkinderen 0:8d87bc453349 1445 LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
ninoderkinderen 0:8d87bc453349 1446 #endif /* TCP_QUEUE_OOSEQ */
ninoderkinderen 0:8d87bc453349 1447 }
ninoderkinderen 0:8d87bc453349 1448
ninoderkinderen 0:8d87bc453349 1449 pcb->state = CLOSED;
ninoderkinderen 0:8d87bc453349 1450
ninoderkinderen 0:8d87bc453349 1451 LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
ninoderkinderen 0:8d87bc453349 1452 }
ninoderkinderen 0:8d87bc453349 1453
ninoderkinderen 0:8d87bc453349 1454 /**
ninoderkinderen 0:8d87bc453349 1455 * Calculates a new initial sequence number for new connections.
ninoderkinderen 0:8d87bc453349 1456 *
ninoderkinderen 0:8d87bc453349 1457 * @return u32_t pseudo random sequence number
ninoderkinderen 0:8d87bc453349 1458 */
ninoderkinderen 0:8d87bc453349 1459 u32_t
ninoderkinderen 0:8d87bc453349 1460 tcp_next_iss(void)
ninoderkinderen 0:8d87bc453349 1461 {
ninoderkinderen 0:8d87bc453349 1462 static u32_t iss = 6510;
ninoderkinderen 0:8d87bc453349 1463
ninoderkinderen 0:8d87bc453349 1464 iss += tcp_ticks; /* XXX */
ninoderkinderen 0:8d87bc453349 1465 return iss;
ninoderkinderen 0:8d87bc453349 1466 }
ninoderkinderen 0:8d87bc453349 1467
ninoderkinderen 0:8d87bc453349 1468 #if TCP_CALCULATE_EFF_SEND_MSS
ninoderkinderen 0:8d87bc453349 1469 /**
ninoderkinderen 0:8d87bc453349 1470 * Calcluates the effective send mss that can be used for a specific IP address
ninoderkinderen 0:8d87bc453349 1471 * by using ip_route to determin the netif used to send to the address and
ninoderkinderen 0:8d87bc453349 1472 * calculating the minimum of TCP_MSS and that netif's mtu (if set).
ninoderkinderen 0:8d87bc453349 1473 */
ninoderkinderen 0:8d87bc453349 1474 u16_t
ninoderkinderen 0:8d87bc453349 1475 tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr)
ninoderkinderen 0:8d87bc453349 1476 {
ninoderkinderen 0:8d87bc453349 1477 u16_t mss_s;
ninoderkinderen 0:8d87bc453349 1478 struct netif *outif;
ninoderkinderen 0:8d87bc453349 1479
ninoderkinderen 0:8d87bc453349 1480 outif = ip_route(addr);
ninoderkinderen 0:8d87bc453349 1481 if ((outif != NULL) && (outif->mtu != 0)) {
ninoderkinderen 0:8d87bc453349 1482 mss_s = outif->mtu - IP_HLEN - TCP_HLEN;
ninoderkinderen 0:8d87bc453349 1483 /* RFC 1122, chap 4.2.2.6:
ninoderkinderen 0:8d87bc453349 1484 * Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
ninoderkinderen 0:8d87bc453349 1485 * We correct for TCP options in tcp_write(), and don't support IP options.
ninoderkinderen 0:8d87bc453349 1486 */
ninoderkinderen 0:8d87bc453349 1487 sendmss = LWIP_MIN(sendmss, mss_s);
ninoderkinderen 0:8d87bc453349 1488 }
ninoderkinderen 0:8d87bc453349 1489 return sendmss;
ninoderkinderen 0:8d87bc453349 1490 }
ninoderkinderen 0:8d87bc453349 1491 #endif /* TCP_CALCULATE_EFF_SEND_MSS */
ninoderkinderen 0:8d87bc453349 1492
ninoderkinderen 0:8d87bc453349 1493 const char*
ninoderkinderen 0:8d87bc453349 1494 tcp_debug_state_str(enum tcp_state s)
ninoderkinderen 0:8d87bc453349 1495 {
ninoderkinderen 0:8d87bc453349 1496 return tcp_state_str[s];
ninoderkinderen 0:8d87bc453349 1497 }
ninoderkinderen 0:8d87bc453349 1498
ninoderkinderen 0:8d87bc453349 1499 #if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
ninoderkinderen 0:8d87bc453349 1500 /**
ninoderkinderen 0:8d87bc453349 1501 * Print a tcp header for debugging purposes.
ninoderkinderen 0:8d87bc453349 1502 *
ninoderkinderen 0:8d87bc453349 1503 * @param tcphdr pointer to a struct tcp_hdr
ninoderkinderen 0:8d87bc453349 1504 */
ninoderkinderen 0:8d87bc453349 1505 void
ninoderkinderen 0:8d87bc453349 1506 tcp_debug_print(struct tcp_hdr *tcphdr)
ninoderkinderen 0:8d87bc453349 1507 {
ninoderkinderen 0:8d87bc453349 1508 LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
ninoderkinderen 0:8d87bc453349 1509 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
ninoderkinderen 0:8d87bc453349 1510 LWIP_DEBUGF(TCP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
ninoderkinderen 0:8d87bc453349 1511 ntohs(tcphdr->src), ntohs(tcphdr->dest)));
ninoderkinderen 0:8d87bc453349 1512 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
ninoderkinderen 0:8d87bc453349 1513 LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (seq no)\n",
ninoderkinderen 0:8d87bc453349 1514 ntohl(tcphdr->seqno)));
ninoderkinderen 0:8d87bc453349 1515 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
ninoderkinderen 0:8d87bc453349 1516 LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (ack no)\n",
ninoderkinderen 0:8d87bc453349 1517 ntohl(tcphdr->ackno)));
ninoderkinderen 0:8d87bc453349 1518 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
ninoderkinderen 0:8d87bc453349 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 (",
ninoderkinderen 0:8d87bc453349 1520 TCPH_HDRLEN(tcphdr),
ninoderkinderen 0:8d87bc453349 1521 TCPH_FLAGS(tcphdr) >> 5 & 1,
ninoderkinderen 0:8d87bc453349 1522 TCPH_FLAGS(tcphdr) >> 4 & 1,
ninoderkinderen 0:8d87bc453349 1523 TCPH_FLAGS(tcphdr) >> 3 & 1,
ninoderkinderen 0:8d87bc453349 1524 TCPH_FLAGS(tcphdr) >> 2 & 1,
ninoderkinderen 0:8d87bc453349 1525 TCPH_FLAGS(tcphdr) >> 1 & 1,
ninoderkinderen 0:8d87bc453349 1526 TCPH_FLAGS(tcphdr) & 1,
ninoderkinderen 0:8d87bc453349 1527 ntohs(tcphdr->wnd)));
ninoderkinderen 0:8d87bc453349 1528 tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
ninoderkinderen 0:8d87bc453349 1529 LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
ninoderkinderen 0:8d87bc453349 1530 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
ninoderkinderen 0:8d87bc453349 1531 LWIP_DEBUGF(TCP_DEBUG, ("| 0x%04"X16_F" | %5"U16_F" | (chksum, urgp)\n",
ninoderkinderen 0:8d87bc453349 1532 ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
ninoderkinderen 0:8d87bc453349 1533 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
ninoderkinderen 0:8d87bc453349 1534 }
ninoderkinderen 0:8d87bc453349 1535
ninoderkinderen 0:8d87bc453349 1536 /**
ninoderkinderen 0:8d87bc453349 1537 * Print a tcp state for debugging purposes.
ninoderkinderen 0:8d87bc453349 1538 *
ninoderkinderen 0:8d87bc453349 1539 * @param s enum tcp_state to print
ninoderkinderen 0:8d87bc453349 1540 */
ninoderkinderen 0:8d87bc453349 1541 void
ninoderkinderen 0:8d87bc453349 1542 tcp_debug_print_state(enum tcp_state s)
ninoderkinderen 0:8d87bc453349 1543 {
ninoderkinderen 0:8d87bc453349 1544 LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
ninoderkinderen 0:8d87bc453349 1545 }
ninoderkinderen 0:8d87bc453349 1546
ninoderkinderen 0:8d87bc453349 1547 /**
ninoderkinderen 0:8d87bc453349 1548 * Print tcp flags for debugging purposes.
ninoderkinderen 0:8d87bc453349 1549 *
ninoderkinderen 0:8d87bc453349 1550 * @param flags tcp flags, all active flags are printed
ninoderkinderen 0:8d87bc453349 1551 */
ninoderkinderen 0:8d87bc453349 1552 void
ninoderkinderen 0:8d87bc453349 1553 tcp_debug_print_flags(u8_t flags)
ninoderkinderen 0:8d87bc453349 1554 {
ninoderkinderen 0:8d87bc453349 1555 if (flags & TCP_FIN) {
ninoderkinderen 0:8d87bc453349 1556 LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
ninoderkinderen 0:8d87bc453349 1557 }
ninoderkinderen 0:8d87bc453349 1558 if (flags & TCP_SYN) {
ninoderkinderen 0:8d87bc453349 1559 LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
ninoderkinderen 0:8d87bc453349 1560 }
ninoderkinderen 0:8d87bc453349 1561 if (flags & TCP_RST) {
ninoderkinderen 0:8d87bc453349 1562 LWIP_DEBUGF(TCP_DEBUG, ("RST "));
ninoderkinderen 0:8d87bc453349 1563 }
ninoderkinderen 0:8d87bc453349 1564 if (flags & TCP_PSH) {
ninoderkinderen 0:8d87bc453349 1565 LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
ninoderkinderen 0:8d87bc453349 1566 }
ninoderkinderen 0:8d87bc453349 1567 if (flags & TCP_ACK) {
ninoderkinderen 0:8d87bc453349 1568 LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
ninoderkinderen 0:8d87bc453349 1569 }
ninoderkinderen 0:8d87bc453349 1570 if (flags & TCP_URG) {
ninoderkinderen 0:8d87bc453349 1571 LWIP_DEBUGF(TCP_DEBUG, ("URG "));
ninoderkinderen 0:8d87bc453349 1572 }
ninoderkinderen 0:8d87bc453349 1573 if (flags & TCP_ECE) {
ninoderkinderen 0:8d87bc453349 1574 LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
ninoderkinderen 0:8d87bc453349 1575 }
ninoderkinderen 0:8d87bc453349 1576 if (flags & TCP_CWR) {
ninoderkinderen 0:8d87bc453349 1577 LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
ninoderkinderen 0:8d87bc453349 1578 }
ninoderkinderen 0:8d87bc453349 1579 LWIP_DEBUGF(TCP_DEBUG, ("\n"));
ninoderkinderen 0:8d87bc453349 1580 }
ninoderkinderen 0:8d87bc453349 1581
ninoderkinderen 0:8d87bc453349 1582 /**
ninoderkinderen 0:8d87bc453349 1583 * Print all tcp_pcbs in every list for debugging purposes.
ninoderkinderen 0:8d87bc453349 1584 */
ninoderkinderen 0:8d87bc453349 1585 void
ninoderkinderen 0:8d87bc453349 1586 tcp_debug_print_pcbs(void)
ninoderkinderen 0:8d87bc453349 1587 {
ninoderkinderen 0:8d87bc453349 1588 struct tcp_pcb *pcb;
ninoderkinderen 0:8d87bc453349 1589 LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
ninoderkinderen 0:8d87bc453349 1590 for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
ninoderkinderen 0:8d87bc453349 1591 LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
ninoderkinderen 0:8d87bc453349 1592 pcb->local_port, pcb->remote_port,
ninoderkinderen 0:8d87bc453349 1593 pcb->snd_nxt, pcb->rcv_nxt));
ninoderkinderen 0:8d87bc453349 1594 tcp_debug_print_state(pcb->state);
ninoderkinderen 0:8d87bc453349 1595 }
ninoderkinderen 0:8d87bc453349 1596 LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
ninoderkinderen 0:8d87bc453349 1597 for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
ninoderkinderen 0:8d87bc453349 1598 LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
ninoderkinderen 0:8d87bc453349 1599 pcb->local_port, pcb->remote_port,
ninoderkinderen 0:8d87bc453349 1600 pcb->snd_nxt, pcb->rcv_nxt));
ninoderkinderen 0:8d87bc453349 1601 tcp_debug_print_state(pcb->state);
ninoderkinderen 0:8d87bc453349 1602 }
ninoderkinderen 0:8d87bc453349 1603 LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
ninoderkinderen 0:8d87bc453349 1604 for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
ninoderkinderen 0:8d87bc453349 1605 LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
ninoderkinderen 0:8d87bc453349 1606 pcb->local_port, pcb->remote_port,
ninoderkinderen 0:8d87bc453349 1607 pcb->snd_nxt, pcb->rcv_nxt));
ninoderkinderen 0:8d87bc453349 1608 tcp_debug_print_state(pcb->state);
ninoderkinderen 0:8d87bc453349 1609 }
ninoderkinderen 0:8d87bc453349 1610 }
ninoderkinderen 0:8d87bc453349 1611
ninoderkinderen 0:8d87bc453349 1612 /**
ninoderkinderen 0:8d87bc453349 1613 * Check state consistency of the tcp_pcb lists.
ninoderkinderen 0:8d87bc453349 1614 */
ninoderkinderen 0:8d87bc453349 1615 s16_t
ninoderkinderen 0:8d87bc453349 1616 tcp_pcbs_sane(void)
ninoderkinderen 0:8d87bc453349 1617 {
ninoderkinderen 0:8d87bc453349 1618 struct tcp_pcb *pcb;
ninoderkinderen 0:8d87bc453349 1619 for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
ninoderkinderen 0:8d87bc453349 1620 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
ninoderkinderen 0:8d87bc453349 1621 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
ninoderkinderen 0:8d87bc453349 1622 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
ninoderkinderen 0:8d87bc453349 1623 }
ninoderkinderen 0:8d87bc453349 1624 for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
ninoderkinderen 0:8d87bc453349 1625 LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
ninoderkinderen 0:8d87bc453349 1626 }
ninoderkinderen 0:8d87bc453349 1627 return 1;
ninoderkinderen 0:8d87bc453349 1628 }
ninoderkinderen 0:8d87bc453349 1629 #endif /* TCP_DEBUG */
ninoderkinderen 0:8d87bc453349 1630
ninoderkinderen 0:8d87bc453349 1631 #endif /* LWIP_TCP */