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lwip/core/tcp.c@0:d7bd7384a37c, 2016-12-07 (annotated)

Committer:
grzemich
Date:
Wed Dec 07 23:47:50 2016 +0000
Revision:
0:d7bd7384a37c
dgd

Who changed what in which revision?

UserRevisionLine numberNew contents of line
grzemich 0:d7bd7384a37c 1 /**
grzemich 0:d7bd7384a37c 2 * @file
grzemich 0:d7bd7384a37c 3 * Transmission Control Protocol for IP
grzemich 0:d7bd7384a37c 4 *
grzemich 0:d7bd7384a37c 5 * This file contains common functions for the TCP implementation, such as functinos
grzemich 0:d7bd7384a37c 6 * for manipulating the data structures and the TCP timer functions. TCP functions
grzemich 0:d7bd7384a37c 7 * related to input and output is found in tcp_in.c and tcp_out.c respectively.
grzemich 0:d7bd7384a37c 8 *
grzemich 0:d7bd7384a37c 9 */
grzemich 0:d7bd7384a37c 10
grzemich 0:d7bd7384a37c 11 /*
grzemich 0:d7bd7384a37c 12 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
grzemich 0:d7bd7384a37c 13 * All rights reserved.
grzemich 0:d7bd7384a37c 14 *
grzemich 0:d7bd7384a37c 15 * Redistribution and use in source and binary forms, with or without modification,
grzemich 0:d7bd7384a37c 16 * are permitted provided that the following conditions are met:
grzemich 0:d7bd7384a37c 17 *
grzemich 0:d7bd7384a37c 18 * 1. Redistributions of source code must retain the above copyright notice,
grzemich 0:d7bd7384a37c 19 * this list of conditions and the following disclaimer.
grzemich 0:d7bd7384a37c 20 * 2. Redistributions in binary form must reproduce the above copyright notice,
grzemich 0:d7bd7384a37c 21 * this list of conditions and the following disclaimer in the documentation
grzemich 0:d7bd7384a37c 22 * and/or other materials provided with the distribution.
grzemich 0:d7bd7384a37c 23 * 3. The name of the author may not be used to endorse or promote products
grzemich 0:d7bd7384a37c 24 * derived from this software without specific prior written permission.
grzemich 0:d7bd7384a37c 25 *
grzemich 0:d7bd7384a37c 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
grzemich 0:d7bd7384a37c 27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
grzemich 0:d7bd7384a37c 28 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
grzemich 0:d7bd7384a37c 29 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
grzemich 0:d7bd7384a37c 30 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
grzemich 0:d7bd7384a37c 31 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
grzemich 0:d7bd7384a37c 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
grzemich 0:d7bd7384a37c 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
grzemich 0:d7bd7384a37c 34 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
grzemich 0:d7bd7384a37c 35 * OF SUCH DAMAGE.
grzemich 0:d7bd7384a37c 36 *
grzemich 0:d7bd7384a37c 37 * This file is part of the lwIP TCP/IP stack.
grzemich 0:d7bd7384a37c 38 *
grzemich 0:d7bd7384a37c 39 * Author: Adam Dunkels <adam@sics.se>
grzemich 0:d7bd7384a37c 40 *
grzemich 0:d7bd7384a37c 41 */
grzemich 0:d7bd7384a37c 42
grzemich 0:d7bd7384a37c 43 #include "lwip/opt.h"
grzemich 0:d7bd7384a37c 44
grzemich 0:d7bd7384a37c 45 #if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
grzemich 0:d7bd7384a37c 46
grzemich 0:d7bd7384a37c 47 #include "lwip/def.h"
grzemich 0:d7bd7384a37c 48 #include "lwip/mem.h"
grzemich 0:d7bd7384a37c 49 #include "lwip/memp.h"
grzemich 0:d7bd7384a37c 50 #include "lwip/snmp.h"
grzemich 0:d7bd7384a37c 51 #include "lwip/tcp.h"
grzemich 0:d7bd7384a37c 52 #include "lwip/tcp_impl.h"
grzemich 0:d7bd7384a37c 53 #include "lwip/debug.h"
grzemich 0:d7bd7384a37c 54 #include "lwip/stats.h"
grzemich 0:d7bd7384a37c 55
grzemich 0:d7bd7384a37c 56 #include <string.h>
grzemich 0:d7bd7384a37c 57
grzemich 0:d7bd7384a37c 58 const char * const tcp_state_str[] = {
grzemich 0:d7bd7384a37c 59 "CLOSED",
grzemich 0:d7bd7384a37c 60 "LISTEN",
grzemich 0:d7bd7384a37c 61 "SYN_SENT",
grzemich 0:d7bd7384a37c 62 "SYN_RCVD",
grzemich 0:d7bd7384a37c 63 "ESTABLISHED",
grzemich 0:d7bd7384a37c 64 "FIN_WAIT_1",
grzemich 0:d7bd7384a37c 65 "FIN_WAIT_2",
grzemich 0:d7bd7384a37c 66 "CLOSE_WAIT",
grzemich 0:d7bd7384a37c 67 "CLOSING",
grzemich 0:d7bd7384a37c 68 "LAST_ACK",
grzemich 0:d7bd7384a37c 69 "TIME_WAIT"
grzemich 0:d7bd7384a37c 70 };
grzemich 0:d7bd7384a37c 71
grzemich 0:d7bd7384a37c 72 /* Incremented every coarse grained timer shot (typically every 500 ms). */
grzemich 0:d7bd7384a37c 73 u32_t tcp_ticks;
grzemich 0:d7bd7384a37c 74 const u8_t tcp_backoff[13] =
grzemich 0:d7bd7384a37c 75 { 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
grzemich 0:d7bd7384a37c 76 /* Times per slowtmr hits */
grzemich 0:d7bd7384a37c 77 const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
grzemich 0:d7bd7384a37c 78
grzemich 0:d7bd7384a37c 79 /* The TCP PCB lists. */
grzemich 0:d7bd7384a37c 80
grzemich 0:d7bd7384a37c 81 /** List of all TCP PCBs bound but not yet (connected || listening) */
grzemich 0:d7bd7384a37c 82 struct tcp_pcb *tcp_bound_pcbs;
grzemich 0:d7bd7384a37c 83 /** List of all TCP PCBs in LISTEN state */
grzemich 0:d7bd7384a37c 84 union tcp_listen_pcbs_t tcp_listen_pcbs;
grzemich 0:d7bd7384a37c 85 /** List of all TCP PCBs that are in a state in which
grzemich 0:d7bd7384a37c 86 * they accept or send data. */
grzemich 0:d7bd7384a37c 87 struct tcp_pcb *tcp_active_pcbs;
grzemich 0:d7bd7384a37c 88 /** List of all TCP PCBs in TIME-WAIT state */
grzemich 0:d7bd7384a37c 89 struct tcp_pcb *tcp_tw_pcbs;
grzemich 0:d7bd7384a37c 90
grzemich 0:d7bd7384a37c 91 #define NUM_TCP_PCB_LISTS 4
grzemich 0:d7bd7384a37c 92 #define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
grzemich 0:d7bd7384a37c 93 /** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
grzemich 0:d7bd7384a37c 94 struct tcp_pcb ** const tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
grzemich 0:d7bd7384a37c 95 &tcp_active_pcbs, &tcp_tw_pcbs};
grzemich 0:d7bd7384a37c 96
grzemich 0:d7bd7384a37c 97 /** Only used for temporary storage. */
grzemich 0:d7bd7384a37c 98 struct tcp_pcb *tcp_tmp_pcb;
grzemich 0:d7bd7384a37c 99
grzemich 0:d7bd7384a37c 100 /** Timer counter to handle calling slow-timer from tcp_tmr() */
grzemich 0:d7bd7384a37c 101 static u8_t tcp_timer;
grzemich 0:d7bd7384a37c 102 static u16_t tcp_new_port(void);
grzemich 0:d7bd7384a37c 103
grzemich 0:d7bd7384a37c 104 /**
grzemich 0:d7bd7384a37c 105 * Called periodically to dispatch TCP timers.
grzemich 0:d7bd7384a37c 106 *
grzemich 0:d7bd7384a37c 107 */
grzemich 0:d7bd7384a37c 108 void
grzemich 0:d7bd7384a37c 109 tcp_tmr(void)
grzemich 0:d7bd7384a37c 110 {
grzemich 0:d7bd7384a37c 111 /* Call tcp_fasttmr() every 250 ms */
grzemich 0:d7bd7384a37c 112 tcp_fasttmr();
grzemich 0:d7bd7384a37c 113
grzemich 0:d7bd7384a37c 114 if (++tcp_timer & 1) {
grzemich 0:d7bd7384a37c 115 /* Call tcp_tmr() every 500 ms, i.e., every other timer
grzemich 0:d7bd7384a37c 116 tcp_tmr() is called. */
grzemich 0:d7bd7384a37c 117 tcp_slowtmr();
grzemich 0:d7bd7384a37c 118 }
grzemich 0:d7bd7384a37c 119 }
grzemich 0:d7bd7384a37c 120
grzemich 0:d7bd7384a37c 121 /**
grzemich 0:d7bd7384a37c 122 * Closes the TX side of a connection held by the PCB.
grzemich 0:d7bd7384a37c 123 * For tcp_close(), a RST is sent if the application didn't receive all data
grzemich 0:d7bd7384a37c 124 * (tcp_recved() not called for all data passed to recv callback).
grzemich 0:d7bd7384a37c 125 *
grzemich 0:d7bd7384a37c 126 * Listening pcbs are freed and may not be referenced any more.
grzemich 0:d7bd7384a37c 127 * Connection pcbs are freed if not yet connected and may not be referenced
grzemich 0:d7bd7384a37c 128 * any more. If a connection is established (at least SYN received or in
grzemich 0:d7bd7384a37c 129 * a closing state), the connection is closed, and put in a closing state.
grzemich 0:d7bd7384a37c 130 * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
grzemich 0:d7bd7384a37c 131 * unsafe to reference it.
grzemich 0:d7bd7384a37c 132 *
grzemich 0:d7bd7384a37c 133 * @param pcb the tcp_pcb to close
grzemich 0:d7bd7384a37c 134 * @return ERR_OK if connection has been closed
grzemich 0:d7bd7384a37c 135 * another err_t if closing failed and pcb is not freed
grzemich 0:d7bd7384a37c 136 */
grzemich 0:d7bd7384a37c 137 static err_t
grzemich 0:d7bd7384a37c 138 tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
grzemich 0:d7bd7384a37c 139 {
grzemich 0:d7bd7384a37c 140 err_t err;
grzemich 0:d7bd7384a37c 141
grzemich 0:d7bd7384a37c 142 if (rst_on_unacked_data && (pcb->state != LISTEN)) {
grzemich 0:d7bd7384a37c 143 if ((pcb->refused_data != NULL) || (pcb->rcv_wnd != TCP_WND)) {
grzemich 0:d7bd7384a37c 144 /* Not all data received by application, send RST to tell the remote
grzemich 0:d7bd7384a37c 145 side about this. */
grzemich 0:d7bd7384a37c 146 LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
grzemich 0:d7bd7384a37c 147
grzemich 0:d7bd7384a37c 148 /* don't call tcp_abort here: we must not deallocate the pcb since
grzemich 0:d7bd7384a37c 149 that might not be expected when calling tcp_close */
grzemich 0:d7bd7384a37c 150 tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
grzemich 0:d7bd7384a37c 151 pcb->local_port, pcb->remote_port);
grzemich 0:d7bd7384a37c 152
grzemich 0:d7bd7384a37c 153 tcp_pcb_purge(pcb);
grzemich 0:d7bd7384a37c 154
grzemich 0:d7bd7384a37c 155 /* TODO: to which state do we move now? */
grzemich 0:d7bd7384a37c 156
grzemich 0:d7bd7384a37c 157 /* move to TIME_WAIT since we close actively */
grzemich 0:d7bd7384a37c 158 TCP_RMV(&tcp_active_pcbs, pcb);
grzemich 0:d7bd7384a37c 159 pcb->state = TIME_WAIT;
grzemich 0:d7bd7384a37c 160 TCP_REG(&tcp_tw_pcbs, pcb);
grzemich 0:d7bd7384a37c 161
grzemich 0:d7bd7384a37c 162 return ERR_OK;
grzemich 0:d7bd7384a37c 163 }
grzemich 0:d7bd7384a37c 164 }
grzemich 0:d7bd7384a37c 165
grzemich 0:d7bd7384a37c 166 switch (pcb->state) {
grzemich 0:d7bd7384a37c 167 case CLOSED:
grzemich 0:d7bd7384a37c 168 /* Closing a pcb in the CLOSED state might seem erroneous,
grzemich 0:d7bd7384a37c 169 * however, it is in this state once allocated and as yet unused
grzemich 0:d7bd7384a37c 170 * and the user needs some way to free it should the need arise.
grzemich 0:d7bd7384a37c 171 * Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
grzemich 0:d7bd7384a37c 172 * or for a pcb that has been used and then entered the CLOSED state
grzemich 0:d7bd7384a37c 173 * is erroneous, but this should never happen as the pcb has in those cases
grzemich 0:d7bd7384a37c 174 * been freed, and so any remaining handles are bogus. */
grzemich 0:d7bd7384a37c 175 err = ERR_OK;
grzemich 0:d7bd7384a37c 176 if (pcb->local_port != 0) {
grzemich 0:d7bd7384a37c 177 TCP_RMV(&tcp_bound_pcbs, pcb);
grzemich 0:d7bd7384a37c 178 }
grzemich 0:d7bd7384a37c 179 memp_free(MEMP_TCP_PCB, pcb);
grzemich 0:d7bd7384a37c 180 pcb = NULL;
grzemich 0:d7bd7384a37c 181 break;
grzemich 0:d7bd7384a37c 182 case LISTEN:
grzemich 0:d7bd7384a37c 183 err = ERR_OK;
grzemich 0:d7bd7384a37c 184 tcp_pcb_remove(&tcp_listen_pcbs.pcbs, pcb);
grzemich 0:d7bd7384a37c 185 memp_free(MEMP_TCP_PCB_LISTEN, pcb);
grzemich 0:d7bd7384a37c 186 pcb = NULL;
grzemich 0:d7bd7384a37c 187 break;
grzemich 0:d7bd7384a37c 188 case SYN_SENT:
grzemich 0:d7bd7384a37c 189 err = ERR_OK;
grzemich 0:d7bd7384a37c 190 tcp_pcb_remove(&tcp_active_pcbs, pcb);
grzemich 0:d7bd7384a37c 191 memp_free(MEMP_TCP_PCB, pcb);
grzemich 0:d7bd7384a37c 192 pcb = NULL;
grzemich 0:d7bd7384a37c 193 snmp_inc_tcpattemptfails();
grzemich 0:d7bd7384a37c 194 break;
grzemich 0:d7bd7384a37c 195 case SYN_RCVD:
grzemich 0:d7bd7384a37c 196 err = tcp_send_fin(pcb);
grzemich 0:d7bd7384a37c 197 if (err == ERR_OK) {
grzemich 0:d7bd7384a37c 198 snmp_inc_tcpattemptfails();
grzemich 0:d7bd7384a37c 199 pcb->state = FIN_WAIT_1;
grzemich 0:d7bd7384a37c 200 }
grzemich 0:d7bd7384a37c 201 break;
grzemich 0:d7bd7384a37c 202 case ESTABLISHED:
grzemich 0:d7bd7384a37c 203 err = tcp_send_fin(pcb);
grzemich 0:d7bd7384a37c 204 if (err == ERR_OK) {
grzemich 0:d7bd7384a37c 205 snmp_inc_tcpestabresets();
grzemich 0:d7bd7384a37c 206 pcb->state = FIN_WAIT_1;
grzemich 0:d7bd7384a37c 207 }
grzemich 0:d7bd7384a37c 208 break;
grzemich 0:d7bd7384a37c 209 case CLOSE_WAIT:
grzemich 0:d7bd7384a37c 210 err = tcp_send_fin(pcb);
grzemich 0:d7bd7384a37c 211 if (err == ERR_OK) {
grzemich 0:d7bd7384a37c 212 snmp_inc_tcpestabresets();
grzemich 0:d7bd7384a37c 213 pcb->state = LAST_ACK;
grzemich 0:d7bd7384a37c 214 }
grzemich 0:d7bd7384a37c 215 break;
grzemich 0:d7bd7384a37c 216 default:
grzemich 0:d7bd7384a37c 217 /* Has already been closed, do nothing. */
grzemich 0:d7bd7384a37c 218 err = ERR_OK;
grzemich 0:d7bd7384a37c 219 pcb = NULL;
grzemich 0:d7bd7384a37c 220 break;
grzemich 0:d7bd7384a37c 221 }
grzemich 0:d7bd7384a37c 222
grzemich 0:d7bd7384a37c 223 if (pcb != NULL && err == ERR_OK) {
grzemich 0:d7bd7384a37c 224 /* To ensure all data has been sent when tcp_close returns, we have
grzemich 0:d7bd7384a37c 225 to make sure tcp_output doesn't fail.
grzemich 0:d7bd7384a37c 226 Since we don't really have to ensure all data has been sent when tcp_close
grzemich 0:d7bd7384a37c 227 returns (unsent data is sent from tcp timer functions, also), we don't care
grzemich 0:d7bd7384a37c 228 for the return value of tcp_output for now. */
grzemich 0:d7bd7384a37c 229 /* @todo: When implementing SO_LINGER, this must be changed somehow:
grzemich 0:d7bd7384a37c 230 If SOF_LINGER is set, the data should be sent and acked before close returns.
grzemich 0:d7bd7384a37c 231 This can only be valid for sequential APIs, not for the raw API. */
grzemich 0:d7bd7384a37c 232 tcp_output(pcb);
grzemich 0:d7bd7384a37c 233 }
grzemich 0:d7bd7384a37c 234 return err;
grzemich 0:d7bd7384a37c 235 }
grzemich 0:d7bd7384a37c 236
grzemich 0:d7bd7384a37c 237 /**
grzemich 0:d7bd7384a37c 238 * Closes the connection held by the PCB.
grzemich 0:d7bd7384a37c 239 *
grzemich 0:d7bd7384a37c 240 * Listening pcbs are freed and may not be referenced any more.
grzemich 0:d7bd7384a37c 241 * Connection pcbs are freed if not yet connected and may not be referenced
grzemich 0:d7bd7384a37c 242 * any more. If a connection is established (at least SYN received or in
grzemich 0:d7bd7384a37c 243 * a closing state), the connection is closed, and put in a closing state.
grzemich 0:d7bd7384a37c 244 * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
grzemich 0:d7bd7384a37c 245 * unsafe to reference it (unless an error is returned).
grzemich 0:d7bd7384a37c 246 *
grzemich 0:d7bd7384a37c 247 * @param pcb the tcp_pcb to close
grzemich 0:d7bd7384a37c 248 * @return ERR_OK if connection has been closed
grzemich 0:d7bd7384a37c 249 * another err_t if closing failed and pcb is not freed
grzemich 0:d7bd7384a37c 250 */
grzemich 0:d7bd7384a37c 251 err_t
grzemich 0:d7bd7384a37c 252 tcp_close(struct tcp_pcb *pcb)
grzemich 0:d7bd7384a37c 253 {
grzemich 0:d7bd7384a37c 254 #if TCP_DEBUG
grzemich 0:d7bd7384a37c 255 LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
grzemich 0:d7bd7384a37c 256 tcp_debug_print_state(pcb->state);
grzemich 0:d7bd7384a37c 257 #endif /* TCP_DEBUG */
grzemich 0:d7bd7384a37c 258
grzemich 0:d7bd7384a37c 259 if (pcb->state != LISTEN) {
grzemich 0:d7bd7384a37c 260 /* Set a flag not to receive any more data... */
grzemich 0:d7bd7384a37c 261 pcb->flags |= TF_RXCLOSED;
grzemich 0:d7bd7384a37c 262 }
grzemich 0:d7bd7384a37c 263 /* ... and close */
grzemich 0:d7bd7384a37c 264 return tcp_close_shutdown(pcb, 1);
grzemich 0:d7bd7384a37c 265 }
grzemich 0:d7bd7384a37c 266
grzemich 0:d7bd7384a37c 267 /**
grzemich 0:d7bd7384a37c 268 * Causes all or part of a full-duplex connection of this PCB to be shut down.
grzemich 0:d7bd7384a37c 269 * This doesn't deallocate the PCB!
grzemich 0:d7bd7384a37c 270 *
grzemich 0:d7bd7384a37c 271 * @param pcb PCB to shutdown
grzemich 0:d7bd7384a37c 272 * @param shut_rx shut down receive side if this is != 0
grzemich 0:d7bd7384a37c 273 * @param shut_tx shut down send side if this is != 0
grzemich 0:d7bd7384a37c 274 * @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
grzemich 0:d7bd7384a37c 275 * another err_t on error.
grzemich 0:d7bd7384a37c 276 */
grzemich 0:d7bd7384a37c 277 err_t
grzemich 0:d7bd7384a37c 278 tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
grzemich 0:d7bd7384a37c 279 {
grzemich 0:d7bd7384a37c 280 if (pcb->state == LISTEN) {
grzemich 0:d7bd7384a37c 281 return ERR_CONN;
grzemich 0:d7bd7384a37c 282 }
grzemich 0:d7bd7384a37c 283 if (shut_rx) {
grzemich 0:d7bd7384a37c 284 /* shut down the receive side: free buffered data... */
grzemich 0:d7bd7384a37c 285 if (pcb->refused_data != NULL) {
grzemich 0:d7bd7384a37c 286 pbuf_free(pcb->refused_data);
grzemich 0:d7bd7384a37c 287 pcb->refused_data = NULL;
grzemich 0:d7bd7384a37c 288 }
grzemich 0:d7bd7384a37c 289 /* ... and set a flag not to receive any more data */
grzemich 0:d7bd7384a37c 290 pcb->flags |= TF_RXCLOSED;
grzemich 0:d7bd7384a37c 291 }
grzemich 0:d7bd7384a37c 292 if (shut_tx) {
grzemich 0:d7bd7384a37c 293 /* This can't happen twice since if it succeeds, the pcb's state is changed.
grzemich 0:d7bd7384a37c 294 Only close in these states as the others directly deallocate the PCB */
grzemich 0:d7bd7384a37c 295 switch (pcb->state) {
grzemich 0:d7bd7384a37c 296 case SYN_RCVD:
grzemich 0:d7bd7384a37c 297 case ESTABLISHED:
grzemich 0:d7bd7384a37c 298 case CLOSE_WAIT:
grzemich 0:d7bd7384a37c 299 return tcp_close_shutdown(pcb, 0);
grzemich 0:d7bd7384a37c 300 default:
grzemich 0:d7bd7384a37c 301 /* don't shut down other states */
grzemich 0:d7bd7384a37c 302 break;
grzemich 0:d7bd7384a37c 303 }
grzemich 0:d7bd7384a37c 304 }
grzemich 0:d7bd7384a37c 305 /* @todo: return another err_t if not in correct state or already shut? */
grzemich 0:d7bd7384a37c 306 return ERR_OK;
grzemich 0:d7bd7384a37c 307 }
grzemich 0:d7bd7384a37c 308
grzemich 0:d7bd7384a37c 309 /**
grzemich 0:d7bd7384a37c 310 * Abandons a connection and optionally sends a RST to the remote
grzemich 0:d7bd7384a37c 311 * host. Deletes the local protocol control block. This is done when
grzemich 0:d7bd7384a37c 312 * a connection is killed because of shortage of memory.
grzemich 0:d7bd7384a37c 313 *
grzemich 0:d7bd7384a37c 314 * @param pcb the tcp_pcb to abort
grzemich 0:d7bd7384a37c 315 * @param reset boolean to indicate whether a reset should be sent
grzemich 0:d7bd7384a37c 316 */
grzemich 0:d7bd7384a37c 317 void
grzemich 0:d7bd7384a37c 318 tcp_abandon(struct tcp_pcb *pcb, int reset)
grzemich 0:d7bd7384a37c 319 {
grzemich 0:d7bd7384a37c 320 u32_t seqno, ackno;
grzemich 0:d7bd7384a37c 321 u16_t remote_port, local_port;
grzemich 0:d7bd7384a37c 322 ip_addr_t remote_ip, local_ip;
grzemich 0:d7bd7384a37c 323 #if LWIP_CALLBACK_API
grzemich 0:d7bd7384a37c 324 tcp_err_fn errf;
grzemich 0:d7bd7384a37c 325 #endif /* LWIP_CALLBACK_API */
grzemich 0:d7bd7384a37c 326 void *errf_arg;
grzemich 0:d7bd7384a37c 327
grzemich 0:d7bd7384a37c 328 /* pcb->state LISTEN not allowed here */
grzemich 0:d7bd7384a37c 329 LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
grzemich 0:d7bd7384a37c 330 pcb->state != LISTEN);
grzemich 0:d7bd7384a37c 331 /* Figure out on which TCP PCB list we are, and remove us. If we
grzemich 0:d7bd7384a37c 332 are in an active state, call the receive function associated with
grzemich 0:d7bd7384a37c 333 the PCB with a NULL argument, and send an RST to the remote end. */
grzemich 0:d7bd7384a37c 334 if (pcb->state == TIME_WAIT) {
grzemich 0:d7bd7384a37c 335 tcp_pcb_remove(&tcp_tw_pcbs, pcb);
grzemich 0:d7bd7384a37c 336 memp_free(MEMP_TCP_PCB, pcb);
grzemich 0:d7bd7384a37c 337 } else {
grzemich 0:d7bd7384a37c 338 seqno = pcb->snd_nxt;
grzemich 0:d7bd7384a37c 339 ackno = pcb->rcv_nxt;
grzemich 0:d7bd7384a37c 340 ip_addr_copy(local_ip, pcb->local_ip);
grzemich 0:d7bd7384a37c 341 ip_addr_copy(remote_ip, pcb->remote_ip);
grzemich 0:d7bd7384a37c 342 local_port = pcb->local_port;
grzemich 0:d7bd7384a37c 343 remote_port = pcb->remote_port;
grzemich 0:d7bd7384a37c 344 #if LWIP_CALLBACK_API
grzemich 0:d7bd7384a37c 345 errf = pcb->errf;
grzemich 0:d7bd7384a37c 346 #endif /* LWIP_CALLBACK_API */
grzemich 0:d7bd7384a37c 347 errf_arg = pcb->callback_arg;
grzemich 0:d7bd7384a37c 348 tcp_pcb_remove(&tcp_active_pcbs, pcb);
grzemich 0:d7bd7384a37c 349 if (pcb->unacked != NULL) {
grzemich 0:d7bd7384a37c 350 tcp_segs_free(pcb->unacked);
grzemich 0:d7bd7384a37c 351 }
grzemich 0:d7bd7384a37c 352 if (pcb->unsent != NULL) {
grzemich 0:d7bd7384a37c 353 tcp_segs_free(pcb->unsent);
grzemich 0:d7bd7384a37c 354 }
grzemich 0:d7bd7384a37c 355 #if TCP_QUEUE_OOSEQ
grzemich 0:d7bd7384a37c 356 if (pcb->ooseq != NULL) {
grzemich 0:d7bd7384a37c 357 tcp_segs_free(pcb->ooseq);
grzemich 0:d7bd7384a37c 358 }
grzemich 0:d7bd7384a37c 359 #endif /* TCP_QUEUE_OOSEQ */
grzemich 0:d7bd7384a37c 360 memp_free(MEMP_TCP_PCB, pcb);
grzemich 0:d7bd7384a37c 361 TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
grzemich 0:d7bd7384a37c 362 if (reset) {
grzemich 0:d7bd7384a37c 363 LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
grzemich 0:d7bd7384a37c 364 tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port);
grzemich 0:d7bd7384a37c 365 }
grzemich 0:d7bd7384a37c 366 }
grzemich 0:d7bd7384a37c 367 }
grzemich 0:d7bd7384a37c 368
grzemich 0:d7bd7384a37c 369 /**
grzemich 0:d7bd7384a37c 370 * Aborts the connection by sending a RST (reset) segment to the remote
grzemich 0:d7bd7384a37c 371 * host. The pcb is deallocated. This function never fails.
grzemich 0:d7bd7384a37c 372 *
grzemich 0:d7bd7384a37c 373 * ATTENTION: When calling this from one of the TCP callbacks, make
grzemich 0:d7bd7384a37c 374 * sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
grzemich 0:d7bd7384a37c 375 * or you will risk accessing deallocated memory or memory leaks!
grzemich 0:d7bd7384a37c 376 *
grzemich 0:d7bd7384a37c 377 * @param pcb the tcp pcb to abort
grzemich 0:d7bd7384a37c 378 */
grzemich 0:d7bd7384a37c 379 void
grzemich 0:d7bd7384a37c 380 tcp_abort(struct tcp_pcb *pcb)
grzemich 0:d7bd7384a37c 381 {
grzemich 0:d7bd7384a37c 382 tcp_abandon(pcb, 1);
grzemich 0:d7bd7384a37c 383 }
grzemich 0:d7bd7384a37c 384
grzemich 0:d7bd7384a37c 385 /**
grzemich 0:d7bd7384a37c 386 * Binds the connection to a local portnumber and IP address. If the
grzemich 0:d7bd7384a37c 387 * IP address is not given (i.e., ipaddr == NULL), the IP address of
grzemich 0:d7bd7384a37c 388 * the outgoing network interface is used instead.
grzemich 0:d7bd7384a37c 389 *
grzemich 0:d7bd7384a37c 390 * @param pcb the tcp_pcb to bind (no check is done whether this pcb is
grzemich 0:d7bd7384a37c 391 * already bound!)
grzemich 0:d7bd7384a37c 392 * @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
grzemich 0:d7bd7384a37c 393 * to any local address
grzemich 0:d7bd7384a37c 394 * @param port the local port to bind to
grzemich 0:d7bd7384a37c 395 * @return ERR_USE if the port is already in use
grzemich 0:d7bd7384a37c 396 * ERR_VAL if bind failed because the PCB is not in a valid state
grzemich 0:d7bd7384a37c 397 * ERR_OK if bound
grzemich 0:d7bd7384a37c 398 */
grzemich 0:d7bd7384a37c 399 err_t
grzemich 0:d7bd7384a37c 400 tcp_bind(struct tcp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
grzemich 0:d7bd7384a37c 401 {
grzemich 0:d7bd7384a37c 402 int i;
grzemich 0:d7bd7384a37c 403 int max_pcb_list = NUM_TCP_PCB_LISTS;
grzemich 0:d7bd7384a37c 404 struct tcp_pcb *cpcb;
grzemich 0:d7bd7384a37c 405
grzemich 0:d7bd7384a37c 406 LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_VAL);
grzemich 0:d7bd7384a37c 407
grzemich 0:d7bd7384a37c 408 #if SO_REUSE
grzemich 0:d7bd7384a37c 409 /* Unless the REUSEADDR flag is set,
grzemich 0:d7bd7384a37c 410 we have to check the pcbs in TIME-WAIT state, also.
grzemich 0:d7bd7384a37c 411 We do not dump TIME_WAIT pcb's; they can still be matched by incoming
grzemich 0:d7bd7384a37c 412 packets using both local and remote IP addresses and ports to distinguish.
grzemich 0:d7bd7384a37c 413 */
grzemich 0:d7bd7384a37c 414 if ((pcb->so_options & SOF_REUSEADDR) != 0) {
grzemich 0:d7bd7384a37c 415 max_pcb_list = NUM_TCP_PCB_LISTS_NO_TIME_WAIT;
grzemich 0:d7bd7384a37c 416 }
grzemich 0:d7bd7384a37c 417 #endif /* SO_REUSE */
grzemich 0:d7bd7384a37c 418
grzemich 0:d7bd7384a37c 419 if (port == 0) {
grzemich 0:d7bd7384a37c 420 port = tcp_new_port();
grzemich 0:d7bd7384a37c 421 }
grzemich 0:d7bd7384a37c 422
grzemich 0:d7bd7384a37c 423 /* Check if the address already is in use (on all lists) */
grzemich 0:d7bd7384a37c 424 for (i = 0; i < max_pcb_list; i++) {
grzemich 0:d7bd7384a37c 425 for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
grzemich 0:d7bd7384a37c 426 if (cpcb->local_port == port) {
grzemich 0:d7bd7384a37c 427 #if SO_REUSE
grzemich 0:d7bd7384a37c 428 /* Omit checking for the same port if both pcbs have REUSEADDR set.
grzemich 0:d7bd7384a37c 429 For SO_REUSEADDR, the duplicate-check for a 5-tuple is done in
grzemich 0:d7bd7384a37c 430 tcp_connect. */
grzemich 0:d7bd7384a37c 431 if (((pcb->so_options & SOF_REUSEADDR) == 0) ||
grzemich 0:d7bd7384a37c 432 ((cpcb->so_options & SOF_REUSEADDR) == 0))
grzemich 0:d7bd7384a37c 433 #endif /* SO_REUSE */
grzemich 0:d7bd7384a37c 434 {
grzemich 0:d7bd7384a37c 435 if (ip_addr_isany(&(cpcb->local_ip)) ||
grzemich 0:d7bd7384a37c 436 ip_addr_isany(ipaddr) ||
grzemich 0:d7bd7384a37c 437 ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
grzemich 0:d7bd7384a37c 438 return ERR_USE;
grzemich 0:d7bd7384a37c 439 }
grzemich 0:d7bd7384a37c 440 }
grzemich 0:d7bd7384a37c 441 }
grzemich 0:d7bd7384a37c 442 }
grzemich 0:d7bd7384a37c 443 }
grzemich 0:d7bd7384a37c 444
grzemich 0:d7bd7384a37c 445 if (!ip_addr_isany(ipaddr)) {
grzemich 0:d7bd7384a37c 446 pcb->local_ip = *ipaddr;
grzemich 0:d7bd7384a37c 447 }
grzemich 0:d7bd7384a37c 448 pcb->local_port = port;
grzemich 0:d7bd7384a37c 449 TCP_REG(&tcp_bound_pcbs, pcb);
grzemich 0:d7bd7384a37c 450 LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
grzemich 0:d7bd7384a37c 451 return ERR_OK;
grzemich 0:d7bd7384a37c 452 }
grzemich 0:d7bd7384a37c 453 #if LWIP_CALLBACK_API
grzemich 0:d7bd7384a37c 454 /**
grzemich 0:d7bd7384a37c 455 * Default accept callback if no accept callback is specified by the user.
grzemich 0:d7bd7384a37c 456 */
grzemich 0:d7bd7384a37c 457 static err_t
grzemich 0:d7bd7384a37c 458 tcp_accept_null(void *arg, struct tcp_pcb *pcb, err_t err)
grzemich 0:d7bd7384a37c 459 {
grzemich 0:d7bd7384a37c 460 LWIP_UNUSED_ARG(arg);
grzemich 0:d7bd7384a37c 461 LWIP_UNUSED_ARG(pcb);
grzemich 0:d7bd7384a37c 462 LWIP_UNUSED_ARG(err);
grzemich 0:d7bd7384a37c 463
grzemich 0:d7bd7384a37c 464 return ERR_ABRT;
grzemich 0:d7bd7384a37c 465 }
grzemich 0:d7bd7384a37c 466 #endif /* LWIP_CALLBACK_API */
grzemich 0:d7bd7384a37c 467
grzemich 0:d7bd7384a37c 468 /**
grzemich 0:d7bd7384a37c 469 * Set the state of the connection to be LISTEN, which means that it
grzemich 0:d7bd7384a37c 470 * is able to accept incoming connections. The protocol control block
grzemich 0:d7bd7384a37c 471 * is reallocated in order to consume less memory. Setting the
grzemich 0:d7bd7384a37c 472 * connection to LISTEN is an irreversible process.
grzemich 0:d7bd7384a37c 473 *
grzemich 0:d7bd7384a37c 474 * @param pcb the original tcp_pcb
grzemich 0:d7bd7384a37c 475 * @param backlog the incoming connections queue limit
grzemich 0:d7bd7384a37c 476 * @return tcp_pcb used for listening, consumes less memory.
grzemich 0:d7bd7384a37c 477 *
grzemich 0:d7bd7384a37c 478 * @note The original tcp_pcb is freed. This function therefore has to be
grzemich 0:d7bd7384a37c 479 * called like this:
grzemich 0:d7bd7384a37c 480 * tpcb = tcp_listen(tpcb);
grzemich 0:d7bd7384a37c 481 */
grzemich 0:d7bd7384a37c 482 struct tcp_pcb *
grzemich 0:d7bd7384a37c 483 tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
grzemich 0:d7bd7384a37c 484 {
grzemich 0:d7bd7384a37c 485 struct tcp_pcb_listen *lpcb;
grzemich 0:d7bd7384a37c 486
grzemich 0:d7bd7384a37c 487 LWIP_UNUSED_ARG(backlog);
grzemich 0:d7bd7384a37c 488 LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL);
grzemich 0:d7bd7384a37c 489
grzemich 0:d7bd7384a37c 490 /* already listening? */
grzemich 0:d7bd7384a37c 491 if (pcb->state == LISTEN) {
grzemich 0:d7bd7384a37c 492 return pcb;
grzemich 0:d7bd7384a37c 493 }
grzemich 0:d7bd7384a37c 494 #if SO_REUSE
grzemich 0:d7bd7384a37c 495 if ((pcb->so_options & SOF_REUSEADDR) != 0) {
grzemich 0:d7bd7384a37c 496 /* Since SOF_REUSEADDR allows reusing a local address before the pcb's usage
grzemich 0:d7bd7384a37c 497 is declared (listen-/connection-pcb), we have to make sure now that
grzemich 0:d7bd7384a37c 498 this port is only used once for every local IP. */
grzemich 0:d7bd7384a37c 499 for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
grzemich 0:d7bd7384a37c 500 if (lpcb->local_port == pcb->local_port) {
grzemich 0:d7bd7384a37c 501 if (ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
grzemich 0:d7bd7384a37c 502 /* this address/port is already used */
grzemich 0:d7bd7384a37c 503 return NULL;
grzemich 0:d7bd7384a37c 504 }
grzemich 0:d7bd7384a37c 505 }
grzemich 0:d7bd7384a37c 506 }
grzemich 0:d7bd7384a37c 507 }
grzemich 0:d7bd7384a37c 508 #endif /* SO_REUSE */
grzemich 0:d7bd7384a37c 509 lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
grzemich 0:d7bd7384a37c 510 if (lpcb == NULL) {
grzemich 0:d7bd7384a37c 511 return NULL;
grzemich 0:d7bd7384a37c 512 }
grzemich 0:d7bd7384a37c 513 lpcb->callback_arg = pcb->callback_arg;
grzemich 0:d7bd7384a37c 514 lpcb->local_port = pcb->local_port;
grzemich 0:d7bd7384a37c 515 lpcb->state = LISTEN;
grzemich 0:d7bd7384a37c 516 lpcb->prio = pcb->prio;
grzemich 0:d7bd7384a37c 517 lpcb->so_options = pcb->so_options;
grzemich 0:d7bd7384a37c 518 lpcb->so_options |= SOF_ACCEPTCONN;
grzemich 0:d7bd7384a37c 519 lpcb->ttl = pcb->ttl;
grzemich 0:d7bd7384a37c 520 lpcb->tos = pcb->tos;
grzemich 0:d7bd7384a37c 521 ip_addr_copy(lpcb->local_ip, pcb->local_ip);
grzemich 0:d7bd7384a37c 522 if (pcb->local_port != 0) {
grzemich 0:d7bd7384a37c 523 TCP_RMV(&tcp_bound_pcbs, pcb);
grzemich 0:d7bd7384a37c 524 }
grzemich 0:d7bd7384a37c 525 memp_free(MEMP_TCP_PCB, pcb);
grzemich 0:d7bd7384a37c 526 #if LWIP_CALLBACK_API
grzemich 0:d7bd7384a37c 527 lpcb->accept = tcp_accept_null;
grzemich 0:d7bd7384a37c 528 #endif /* LWIP_CALLBACK_API */
grzemich 0:d7bd7384a37c 529 #if TCP_LISTEN_BACKLOG
grzemich 0:d7bd7384a37c 530 lpcb->accepts_pending = 0;
grzemich 0:d7bd7384a37c 531 lpcb->backlog = (backlog ? backlog : 1);
grzemich 0:d7bd7384a37c 532 #endif /* TCP_LISTEN_BACKLOG */
grzemich 0:d7bd7384a37c 533 TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
grzemich 0:d7bd7384a37c 534 return (struct tcp_pcb *)lpcb;
grzemich 0:d7bd7384a37c 535 }
grzemich 0:d7bd7384a37c 536
grzemich 0:d7bd7384a37c 537 /**
grzemich 0:d7bd7384a37c 538 * Update the state that tracks the available window space to advertise.
grzemich 0:d7bd7384a37c 539 *
grzemich 0:d7bd7384a37c 540 * Returns how much extra window would be advertised if we sent an
grzemich 0:d7bd7384a37c 541 * update now.
grzemich 0:d7bd7384a37c 542 */
grzemich 0:d7bd7384a37c 543 u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
grzemich 0:d7bd7384a37c 544 {
grzemich 0:d7bd7384a37c 545 u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
grzemich 0:d7bd7384a37c 546
grzemich 0:d7bd7384a37c 547 if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) {
grzemich 0:d7bd7384a37c 548 /* we can advertise more window */
grzemich 0:d7bd7384a37c 549 pcb->rcv_ann_wnd = pcb->rcv_wnd;
grzemich 0:d7bd7384a37c 550 return new_right_edge - pcb->rcv_ann_right_edge;
grzemich 0:d7bd7384a37c 551 } else {
grzemich 0:d7bd7384a37c 552 if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
grzemich 0:d7bd7384a37c 553 /* Can happen due to other end sending out of advertised window,
grzemich 0:d7bd7384a37c 554 * but within actual available (but not yet advertised) window */
grzemich 0:d7bd7384a37c 555 pcb->rcv_ann_wnd = 0;
grzemich 0:d7bd7384a37c 556 } else {
grzemich 0:d7bd7384a37c 557 /* keep the right edge of window constant */
grzemich 0:d7bd7384a37c 558 u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
grzemich 0:d7bd7384a37c 559 LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff", new_rcv_ann_wnd <= 0xffff);
grzemich 0:d7bd7384a37c 560 pcb->rcv_ann_wnd = (u16_t)new_rcv_ann_wnd;
grzemich 0:d7bd7384a37c 561 }
grzemich 0:d7bd7384a37c 562 return 0;
grzemich 0:d7bd7384a37c 563 }
grzemich 0:d7bd7384a37c 564 }
grzemich 0:d7bd7384a37c 565
grzemich 0:d7bd7384a37c 566 /**
grzemich 0:d7bd7384a37c 567 * This function should be called by the application when it has
grzemich 0:d7bd7384a37c 568 * processed the data. The purpose is to advertise a larger window
grzemich 0:d7bd7384a37c 569 * when the data has been processed.
grzemich 0:d7bd7384a37c 570 *
grzemich 0:d7bd7384a37c 571 * @param pcb the tcp_pcb for which data is read
grzemich 0:d7bd7384a37c 572 * @param len the amount of bytes that have been read by the application
grzemich 0:d7bd7384a37c 573 */
grzemich 0:d7bd7384a37c 574 void
grzemich 0:d7bd7384a37c 575 tcp_recved(struct tcp_pcb *pcb, u16_t len)
grzemich 0:d7bd7384a37c 576 {
grzemich 0:d7bd7384a37c 577 int wnd_inflation;
grzemich 0:d7bd7384a37c 578
grzemich 0:d7bd7384a37c 579 LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
grzemich 0:d7bd7384a37c 580 len <= 0xffff - pcb->rcv_wnd );
grzemich 0:d7bd7384a37c 581
grzemich 0:d7bd7384a37c 582 pcb->rcv_wnd += len;
grzemich 0:d7bd7384a37c 583 if (pcb->rcv_wnd > TCP_WND) {
grzemich 0:d7bd7384a37c 584 pcb->rcv_wnd = TCP_WND;
grzemich 0:d7bd7384a37c 585 }
grzemich 0:d7bd7384a37c 586
grzemich 0:d7bd7384a37c 587 wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
grzemich 0:d7bd7384a37c 588
grzemich 0:d7bd7384a37c 589 /* If the change in the right edge of window is significant (default
grzemich 0:d7bd7384a37c 590 * watermark is TCP_WND/4), then send an explicit update now.
grzemich 0:d7bd7384a37c 591 * Otherwise wait for a packet to be sent in the normal course of
grzemich 0:d7bd7384a37c 592 * events (or more window to be available later) */
grzemich 0:d7bd7384a37c 593 if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
grzemich 0:d7bd7384a37c 594 tcp_ack_now(pcb);
grzemich 0:d7bd7384a37c 595 tcp_output(pcb);
grzemich 0:d7bd7384a37c 596 }
grzemich 0:d7bd7384a37c 597
grzemich 0:d7bd7384a37c 598 LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
grzemich 0:d7bd7384a37c 599 len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
grzemich 0:d7bd7384a37c 600 }
grzemich 0:d7bd7384a37c 601
grzemich 0:d7bd7384a37c 602 /**
grzemich 0:d7bd7384a37c 603 * A nastly hack featuring 'goto' statements that allocates a
grzemich 0:d7bd7384a37c 604 * new TCP local port.
grzemich 0:d7bd7384a37c 605 *
grzemich 0:d7bd7384a37c 606 * @return a new (free) local TCP port number
grzemich 0:d7bd7384a37c 607 */
grzemich 0:d7bd7384a37c 608 static u16_t
grzemich 0:d7bd7384a37c 609 tcp_new_port(void)
grzemich 0:d7bd7384a37c 610 {
grzemich 0:d7bd7384a37c 611 int i;
grzemich 0:d7bd7384a37c 612 struct tcp_pcb *pcb;
grzemich 0:d7bd7384a37c 613 #ifndef TCP_LOCAL_PORT_RANGE_START
grzemich 0:d7bd7384a37c 614 /* From http://www.iana.org/assignments/port-numbers:
grzemich 0:d7bd7384a37c 615 "The Dynamic and/or Private Ports are those from 49152 through 65535" */
grzemich 0:d7bd7384a37c 616 #define TCP_LOCAL_PORT_RANGE_START 0xc000
grzemich 0:d7bd7384a37c 617 #define TCP_LOCAL_PORT_RANGE_END 0xffff
grzemich 0:d7bd7384a37c 618 #endif
grzemich 0:d7bd7384a37c 619 static u16_t port = TCP_LOCAL_PORT_RANGE_START;
grzemich 0:d7bd7384a37c 620
grzemich 0:d7bd7384a37c 621 again:
grzemich 0:d7bd7384a37c 622 if (port++ >= TCP_LOCAL_PORT_RANGE_END) {
grzemich 0:d7bd7384a37c 623 port = TCP_LOCAL_PORT_RANGE_START;
grzemich 0:d7bd7384a37c 624 }
grzemich 0:d7bd7384a37c 625 /* Check all PCB lists. */
grzemich 0:d7bd7384a37c 626 for (i = 0; i < NUM_TCP_PCB_LISTS; i++) {
grzemich 0:d7bd7384a37c 627 for(pcb = *tcp_pcb_lists[i]; pcb != NULL; pcb = pcb->next) {
grzemich 0:d7bd7384a37c 628 if (pcb->local_port == port) {
grzemich 0:d7bd7384a37c 629 goto again;
grzemich 0:d7bd7384a37c 630 }
grzemich 0:d7bd7384a37c 631 }
grzemich 0:d7bd7384a37c 632 }
grzemich 0:d7bd7384a37c 633 return port;
grzemich 0:d7bd7384a37c 634 }
grzemich 0:d7bd7384a37c 635
grzemich 0:d7bd7384a37c 636 /**
grzemich 0:d7bd7384a37c 637 * Connects to another host. The function given as the "connected"
grzemich 0:d7bd7384a37c 638 * argument will be called when the connection has been established.
grzemich 0:d7bd7384a37c 639 *
grzemich 0:d7bd7384a37c 640 * @param pcb the tcp_pcb used to establish the connection
grzemich 0:d7bd7384a37c 641 * @param ipaddr the remote ip address to connect to
grzemich 0:d7bd7384a37c 642 * @param port the remote tcp port to connect to
grzemich 0:d7bd7384a37c 643 * @param connected callback function to call when connected (or on error)
grzemich 0:d7bd7384a37c 644 * @return ERR_VAL if invalid arguments are given
grzemich 0:d7bd7384a37c 645 * ERR_OK if connect request has been sent
grzemich 0:d7bd7384a37c 646 * other err_t values if connect request couldn't be sent
grzemich 0:d7bd7384a37c 647 */
grzemich 0:d7bd7384a37c 648 err_t
grzemich 0:d7bd7384a37c 649 tcp_connect(struct tcp_pcb *pcb, ip_addr_t *ipaddr, u16_t port,
grzemich 0:d7bd7384a37c 650 tcp_connected_fn connected)
grzemich 0:d7bd7384a37c 651 {
grzemich 0:d7bd7384a37c 652 err_t ret;
grzemich 0:d7bd7384a37c 653 u32_t iss;
grzemich 0:d7bd7384a37c 654 u16_t old_local_port;
grzemich 0:d7bd7384a37c 655
grzemich 0:d7bd7384a37c 656 LWIP_ERROR("tcp_connect: can only connect from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
grzemich 0:d7bd7384a37c 657
grzemich 0:d7bd7384a37c 658 LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
grzemich 0:d7bd7384a37c 659 if (ipaddr != NULL) {
grzemich 0:d7bd7384a37c 660 pcb->remote_ip = *ipaddr;
grzemich 0:d7bd7384a37c 661 } else {
grzemich 0:d7bd7384a37c 662 return ERR_VAL;
grzemich 0:d7bd7384a37c 663 }
grzemich 0:d7bd7384a37c 664 pcb->remote_port = port;
grzemich 0:d7bd7384a37c 665
grzemich 0:d7bd7384a37c 666 /* check if we have a route to the remote host */
grzemich 0:d7bd7384a37c 667 if (ip_addr_isany(&(pcb->local_ip))) {
grzemich 0:d7bd7384a37c 668 /* no local IP address set, yet. */
grzemich 0:d7bd7384a37c 669 struct netif *netif = ip_route(&(pcb->remote_ip));
grzemich 0:d7bd7384a37c 670 if (netif == NULL) {
grzemich 0:d7bd7384a37c 671 /* Don't even try to send a SYN packet if we have no route
grzemich 0:d7bd7384a37c 672 since that will fail. */
grzemich 0:d7bd7384a37c 673 return ERR_RTE;
grzemich 0:d7bd7384a37c 674 }
grzemich 0:d7bd7384a37c 675 /* Use the netif's IP address as local address. */
grzemich 0:d7bd7384a37c 676 ip_addr_copy(pcb->local_ip, netif->ip_addr);
grzemich 0:d7bd7384a37c 677 }
grzemich 0:d7bd7384a37c 678
grzemich 0:d7bd7384a37c 679 old_local_port = pcb->local_port;
grzemich 0:d7bd7384a37c 680 if (pcb->local_port == 0) {
grzemich 0:d7bd7384a37c 681 pcb->local_port = tcp_new_port();
grzemich 0:d7bd7384a37c 682 }
grzemich 0:d7bd7384a37c 683 #if SO_REUSE
grzemich 0:d7bd7384a37c 684 if ((pcb->so_options & SOF_REUSEADDR) != 0) {
grzemich 0:d7bd7384a37c 685 /* Since SOF_REUSEADDR allows reusing a local address, we have to make sure
grzemich 0:d7bd7384a37c 686 now that the 5-tuple is unique. */
grzemich 0:d7bd7384a37c 687 struct tcp_pcb *cpcb;
grzemich 0:d7bd7384a37c 688 int i;
grzemich 0:d7bd7384a37c 689 /* Don't check listen- and bound-PCBs, check active- and TIME-WAIT PCBs. */
grzemich 0:d7bd7384a37c 690 for (i = 2; i < NUM_TCP_PCB_LISTS; i++) {
grzemich 0:d7bd7384a37c 691 for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
grzemich 0:d7bd7384a37c 692 if ((cpcb->local_port == pcb->local_port) &&
grzemich 0:d7bd7384a37c 693 (cpcb->remote_port == port) &&
grzemich 0:d7bd7384a37c 694 ip_addr_cmp(&cpcb->local_ip, &pcb->local_ip) &&
grzemich 0:d7bd7384a37c 695 ip_addr_cmp(&cpcb->remote_ip, ipaddr)) {
grzemich 0:d7bd7384a37c 696 /* linux returns EISCONN here, but ERR_USE should be OK for us */
grzemich 0:d7bd7384a37c 697 return ERR_USE;
grzemich 0:d7bd7384a37c 698 }
grzemich 0:d7bd7384a37c 699 }
grzemich 0:d7bd7384a37c 700 }
grzemich 0:d7bd7384a37c 701 }
grzemich 0:d7bd7384a37c 702 #endif /* SO_REUSE */
grzemich 0:d7bd7384a37c 703 iss = tcp_next_iss();
grzemich 0:d7bd7384a37c 704 pcb->rcv_nxt = 0;
grzemich 0:d7bd7384a37c 705 pcb->snd_nxt = iss;
grzemich 0:d7bd7384a37c 706 pcb->lastack = iss - 1;
grzemich 0:d7bd7384a37c 707 pcb->snd_lbb = iss - 1;
grzemich 0:d7bd7384a37c 708 pcb->rcv_wnd = TCP_WND;
grzemich 0:d7bd7384a37c 709 pcb->rcv_ann_wnd = TCP_WND;
grzemich 0:d7bd7384a37c 710 pcb->rcv_ann_right_edge = pcb->rcv_nxt;
grzemich 0:d7bd7384a37c 711 pcb->snd_wnd = TCP_WND;
grzemich 0:d7bd7384a37c 712 /* As initial send MSS, we use TCP_MSS but limit it to 536.
grzemich 0:d7bd7384a37c 713 The send MSS is updated when an MSS option is received. */
grzemich 0:d7bd7384a37c 714 pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
grzemich 0:d7bd7384a37c 715 #if TCP_CALCULATE_EFF_SEND_MSS
grzemich 0:d7bd7384a37c 716 pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr);
grzemich 0:d7bd7384a37c 717 #endif /* TCP_CALCULATE_EFF_SEND_MSS */
grzemich 0:d7bd7384a37c 718 pcb->cwnd = 1;
grzemich 0:d7bd7384a37c 719 pcb->ssthresh = pcb->mss * 10;
grzemich 0:d7bd7384a37c 720 #if LWIP_CALLBACK_API
grzemich 0:d7bd7384a37c 721 pcb->connected = connected;
grzemich 0:d7bd7384a37c 722 #else /* LWIP_CALLBACK_API */
grzemich 0:d7bd7384a37c 723 LWIP_UNUSED_ARG(connected);
grzemich 0:d7bd7384a37c 724 #endif /* LWIP_CALLBACK_API */
grzemich 0:d7bd7384a37c 725
grzemich 0:d7bd7384a37c 726 /* Send a SYN together with the MSS option. */
grzemich 0:d7bd7384a37c 727 ret = tcp_enqueue_flags(pcb, TCP_SYN);
grzemich 0:d7bd7384a37c 728 if (ret == ERR_OK) {
grzemich 0:d7bd7384a37c 729 /* SYN segment was enqueued, changed the pcbs state now */
grzemich 0:d7bd7384a37c 730 pcb->state = SYN_SENT;
grzemich 0:d7bd7384a37c 731 if (old_local_port != 0) {
grzemich 0:d7bd7384a37c 732 TCP_RMV(&tcp_bound_pcbs, pcb);
grzemich 0:d7bd7384a37c 733 }
grzemich 0:d7bd7384a37c 734 TCP_REG(&tcp_active_pcbs, pcb);
grzemich 0:d7bd7384a37c 735 snmp_inc_tcpactiveopens();
grzemich 0:d7bd7384a37c 736
grzemich 0:d7bd7384a37c 737 tcp_output(pcb);
grzemich 0:d7bd7384a37c 738 }
grzemich 0:d7bd7384a37c 739 return ret;
grzemich 0:d7bd7384a37c 740 }
grzemich 0:d7bd7384a37c 741
grzemich 0:d7bd7384a37c 742 /**
grzemich 0:d7bd7384a37c 743 * Called every 500 ms and implements the retransmission timer and the timer that
grzemich 0:d7bd7384a37c 744 * removes PCBs that have been in TIME-WAIT for enough time. It also increments
grzemich 0:d7bd7384a37c 745 * various timers such as the inactivity timer in each PCB.
grzemich 0:d7bd7384a37c 746 *
grzemich 0:d7bd7384a37c 747 * Automatically called from tcp_tmr().
grzemich 0:d7bd7384a37c 748 */
grzemich 0:d7bd7384a37c 749 void
grzemich 0:d7bd7384a37c 750 tcp_slowtmr(void)
grzemich 0:d7bd7384a37c 751 {
grzemich 0:d7bd7384a37c 752 struct tcp_pcb *pcb, *prev;
grzemich 0:d7bd7384a37c 753 u16_t eff_wnd;
grzemich 0:d7bd7384a37c 754 u8_t pcb_remove; /* flag if a PCB should be removed */
grzemich 0:d7bd7384a37c 755 u8_t pcb_reset; /* flag if a RST should be sent when removing */
grzemich 0:d7bd7384a37c 756 err_t err;
grzemich 0:d7bd7384a37c 757
grzemich 0:d7bd7384a37c 758 err = ERR_OK;
grzemich 0:d7bd7384a37c 759
grzemich 0:d7bd7384a37c 760 ++tcp_ticks;
grzemich 0:d7bd7384a37c 761
grzemich 0:d7bd7384a37c 762 /* Steps through all of the active PCBs. */
grzemich 0:d7bd7384a37c 763 prev = NULL;
grzemich 0:d7bd7384a37c 764 pcb = tcp_active_pcbs;
grzemich 0:d7bd7384a37c 765 if (pcb == NULL) {
grzemich 0:d7bd7384a37c 766 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
grzemich 0:d7bd7384a37c 767 }
grzemich 0:d7bd7384a37c 768 while (pcb != NULL) {
grzemich 0:d7bd7384a37c 769 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
grzemich 0:d7bd7384a37c 770 LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
grzemich 0:d7bd7384a37c 771 LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
grzemich 0:d7bd7384a37c 772 LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
grzemich 0:d7bd7384a37c 773
grzemich 0:d7bd7384a37c 774 pcb_remove = 0;
grzemich 0:d7bd7384a37c 775 pcb_reset = 0;
grzemich 0:d7bd7384a37c 776
grzemich 0:d7bd7384a37c 777 if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
grzemich 0:d7bd7384a37c 778 ++pcb_remove;
grzemich 0:d7bd7384a37c 779 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
grzemich 0:d7bd7384a37c 780 }
grzemich 0:d7bd7384a37c 781 else if (pcb->nrtx == TCP_MAXRTX) {
grzemich 0:d7bd7384a37c 782 ++pcb_remove;
grzemich 0:d7bd7384a37c 783 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
grzemich 0:d7bd7384a37c 784 } else {
grzemich 0:d7bd7384a37c 785 if (pcb->persist_backoff > 0) {
grzemich 0:d7bd7384a37c 786 /* If snd_wnd is zero, use persist timer to send 1 byte probes
grzemich 0:d7bd7384a37c 787 * instead of using the standard retransmission mechanism. */
grzemich 0:d7bd7384a37c 788 pcb->persist_cnt++;
grzemich 0:d7bd7384a37c 789 if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) {
grzemich 0:d7bd7384a37c 790 pcb->persist_cnt = 0;
grzemich 0:d7bd7384a37c 791 if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
grzemich 0:d7bd7384a37c 792 pcb->persist_backoff++;
grzemich 0:d7bd7384a37c 793 }
grzemich 0:d7bd7384a37c 794 tcp_zero_window_probe(pcb);
grzemich 0:d7bd7384a37c 795 }
grzemich 0:d7bd7384a37c 796 } else {
grzemich 0:d7bd7384a37c 797 /* Increase the retransmission timer if it is running */
grzemich 0:d7bd7384a37c 798 if(pcb->rtime >= 0)
grzemich 0:d7bd7384a37c 799 ++pcb->rtime;
grzemich 0:d7bd7384a37c 800
grzemich 0:d7bd7384a37c 801 if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
grzemich 0:d7bd7384a37c 802 /* Time for a retransmission. */
grzemich 0:d7bd7384a37c 803 LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
grzemich 0:d7bd7384a37c 804 " pcb->rto %"S16_F"\n",
grzemich 0:d7bd7384a37c 805 pcb->rtime, pcb->rto));
grzemich 0:d7bd7384a37c 806
grzemich 0:d7bd7384a37c 807 /* Double retransmission time-out unless we are trying to
grzemich 0:d7bd7384a37c 808 * connect to somebody (i.e., we are in SYN_SENT). */
grzemich 0:d7bd7384a37c 809 if (pcb->state != SYN_SENT) {
grzemich 0:d7bd7384a37c 810 pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
grzemich 0:d7bd7384a37c 811 }
grzemich 0:d7bd7384a37c 812
grzemich 0:d7bd7384a37c 813 /* Reset the retransmission timer. */
grzemich 0:d7bd7384a37c 814 pcb->rtime = 0;
grzemich 0:d7bd7384a37c 815
grzemich 0:d7bd7384a37c 816 /* Reduce congestion window and ssthresh. */
grzemich 0:d7bd7384a37c 817 eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
grzemich 0:d7bd7384a37c 818 pcb->ssthresh = eff_wnd >> 1;
grzemich 0:d7bd7384a37c 819 if (pcb->ssthresh < (pcb->mss << 1)) {
grzemich 0:d7bd7384a37c 820 pcb->ssthresh = (pcb->mss << 1);
grzemich 0:d7bd7384a37c 821 }
grzemich 0:d7bd7384a37c 822 pcb->cwnd = pcb->mss;
grzemich 0:d7bd7384a37c 823 LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F
grzemich 0:d7bd7384a37c 824 " ssthresh %"U16_F"\n",
grzemich 0:d7bd7384a37c 825 pcb->cwnd, pcb->ssthresh));
grzemich 0:d7bd7384a37c 826
grzemich 0:d7bd7384a37c 827 /* The following needs to be called AFTER cwnd is set to one
grzemich 0:d7bd7384a37c 828 mss - STJ */
grzemich 0:d7bd7384a37c 829 tcp_rexmit_rto(pcb);
grzemich 0:d7bd7384a37c 830 }
grzemich 0:d7bd7384a37c 831 }
grzemich 0:d7bd7384a37c 832 }
grzemich 0:d7bd7384a37c 833 /* Check if this PCB has stayed too long in FIN-WAIT-2 */
grzemich 0:d7bd7384a37c 834 if (pcb->state == FIN_WAIT_2) {
grzemich 0:d7bd7384a37c 835 if ((u32_t)(tcp_ticks - pcb->tmr) >
grzemich 0:d7bd7384a37c 836 TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
grzemich 0:d7bd7384a37c 837 ++pcb_remove;
grzemich 0:d7bd7384a37c 838 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
grzemich 0:d7bd7384a37c 839 }
grzemich 0:d7bd7384a37c 840 }
grzemich 0:d7bd7384a37c 841
grzemich 0:d7bd7384a37c 842 /* Check if KEEPALIVE should be sent */
grzemich 0:d7bd7384a37c 843 if((pcb->so_options & SOF_KEEPALIVE) &&
grzemich 0:d7bd7384a37c 844 ((pcb->state == ESTABLISHED) ||
grzemich 0:d7bd7384a37c 845 (pcb->state == CLOSE_WAIT))) {
grzemich 0:d7bd7384a37c 846 #if LWIP_TCP_KEEPALIVE
grzemich 0:d7bd7384a37c 847 if((u32_t)(tcp_ticks - pcb->tmr) >
grzemich 0:d7bd7384a37c 848 (pcb->keep_idle + (pcb->keep_cnt*pcb->keep_intvl))
grzemich 0:d7bd7384a37c 849 / TCP_SLOW_INTERVAL)
grzemich 0:d7bd7384a37c 850 #else
grzemich 0:d7bd7384a37c 851 if((u32_t)(tcp_ticks - pcb->tmr) >
grzemich 0:d7bd7384a37c 852 (pcb->keep_idle + TCP_MAXIDLE) / TCP_SLOW_INTERVAL)
grzemich 0:d7bd7384a37c 853 #endif /* LWIP_TCP_KEEPALIVE */
grzemich 0:d7bd7384a37c 854 {
grzemich 0:d7bd7384a37c 855 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n",
grzemich 0:d7bd7384a37c 856 ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
grzemich 0:d7bd7384a37c 857 ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
grzemich 0:d7bd7384a37c 858
grzemich 0:d7bd7384a37c 859 ++pcb_remove;
grzemich 0:d7bd7384a37c 860 ++pcb_reset;
grzemich 0:d7bd7384a37c 861 }
grzemich 0:d7bd7384a37c 862 #if LWIP_TCP_KEEPALIVE
grzemich 0:d7bd7384a37c 863 else if((u32_t)(tcp_ticks - pcb->tmr) >
grzemich 0:d7bd7384a37c 864 (pcb->keep_idle + pcb->keep_cnt_sent * pcb->keep_intvl)
grzemich 0:d7bd7384a37c 865 / TCP_SLOW_INTERVAL)
grzemich 0:d7bd7384a37c 866 #else
grzemich 0:d7bd7384a37c 867 else if((u32_t)(tcp_ticks - pcb->tmr) >
grzemich 0:d7bd7384a37c 868 (pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEPINTVL_DEFAULT)
grzemich 0:d7bd7384a37c 869 / TCP_SLOW_INTERVAL)
grzemich 0:d7bd7384a37c 870 #endif /* LWIP_TCP_KEEPALIVE */
grzemich 0:d7bd7384a37c 871 {
grzemich 0:d7bd7384a37c 872 tcp_keepalive(pcb);
grzemich 0:d7bd7384a37c 873 pcb->keep_cnt_sent++;
grzemich 0:d7bd7384a37c 874 }
grzemich 0:d7bd7384a37c 875 }
grzemich 0:d7bd7384a37c 876
grzemich 0:d7bd7384a37c 877 /* If this PCB has queued out of sequence data, but has been
grzemich 0:d7bd7384a37c 878 inactive for too long, will drop the data (it will eventually
grzemich 0:d7bd7384a37c 879 be retransmitted). */
grzemich 0:d7bd7384a37c 880 #if TCP_QUEUE_OOSEQ
grzemich 0:d7bd7384a37c 881 if (pcb->ooseq != NULL &&
grzemich 0:d7bd7384a37c 882 (u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) {
grzemich 0:d7bd7384a37c 883 tcp_segs_free(pcb->ooseq);
grzemich 0:d7bd7384a37c 884 pcb->ooseq = NULL;
grzemich 0:d7bd7384a37c 885 LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
grzemich 0:d7bd7384a37c 886 }
grzemich 0:d7bd7384a37c 887 #endif /* TCP_QUEUE_OOSEQ */
grzemich 0:d7bd7384a37c 888
grzemich 0:d7bd7384a37c 889 /* Check if this PCB has stayed too long in SYN-RCVD */
grzemich 0:d7bd7384a37c 890 if (pcb->state == SYN_RCVD) {
grzemich 0:d7bd7384a37c 891 if ((u32_t)(tcp_ticks - pcb->tmr) >
grzemich 0:d7bd7384a37c 892 TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
grzemich 0:d7bd7384a37c 893 ++pcb_remove;
grzemich 0:d7bd7384a37c 894 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
grzemich 0:d7bd7384a37c 895 }
grzemich 0:d7bd7384a37c 896 }
grzemich 0:d7bd7384a37c 897
grzemich 0:d7bd7384a37c 898 /* Check if this PCB has stayed too long in LAST-ACK */
grzemich 0:d7bd7384a37c 899 if (pcb->state == LAST_ACK) {
grzemich 0:d7bd7384a37c 900 if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
grzemich 0:d7bd7384a37c 901 ++pcb_remove;
grzemich 0:d7bd7384a37c 902 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
grzemich 0:d7bd7384a37c 903 }
grzemich 0:d7bd7384a37c 904 }
grzemich 0:d7bd7384a37c 905
grzemich 0:d7bd7384a37c 906 /* If the PCB should be removed, do it. */
grzemich 0:d7bd7384a37c 907 if (pcb_remove) {
grzemich 0:d7bd7384a37c 908 struct tcp_pcb *pcb2;
grzemich 0:d7bd7384a37c 909 tcp_pcb_purge(pcb);
grzemich 0:d7bd7384a37c 910 /* Remove PCB from tcp_active_pcbs list. */
grzemich 0:d7bd7384a37c 911 if (prev != NULL) {
grzemich 0:d7bd7384a37c 912 LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
grzemich 0:d7bd7384a37c 913 prev->next = pcb->next;
grzemich 0:d7bd7384a37c 914 } else {
grzemich 0:d7bd7384a37c 915 /* This PCB was the first. */
grzemich 0:d7bd7384a37c 916 LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
grzemich 0:d7bd7384a37c 917 tcp_active_pcbs = pcb->next;
grzemich 0:d7bd7384a37c 918 }
grzemich 0:d7bd7384a37c 919
grzemich 0:d7bd7384a37c 920 TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_ABRT);
grzemich 0:d7bd7384a37c 921 if (pcb_reset) {
grzemich 0:d7bd7384a37c 922 tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
grzemich 0:d7bd7384a37c 923 pcb->local_port, pcb->remote_port);
grzemich 0:d7bd7384a37c 924 }
grzemich 0:d7bd7384a37c 925
grzemich 0:d7bd7384a37c 926 pcb2 = pcb;
grzemich 0:d7bd7384a37c 927 pcb = pcb->next;
grzemich 0:d7bd7384a37c 928 memp_free(MEMP_TCP_PCB, pcb2);
grzemich 0:d7bd7384a37c 929 } else {
grzemich 0:d7bd7384a37c 930 /* get the 'next' element now and work with 'prev' below (in case of abort) */
grzemich 0:d7bd7384a37c 931 prev = pcb;
grzemich 0:d7bd7384a37c 932 pcb = pcb->next;
grzemich 0:d7bd7384a37c 933
grzemich 0:d7bd7384a37c 934 /* We check if we should poll the connection. */
grzemich 0:d7bd7384a37c 935 ++prev->polltmr;
grzemich 0:d7bd7384a37c 936 if (prev->polltmr >= prev->pollinterval) {
grzemich 0:d7bd7384a37c 937 prev->polltmr = 0;
grzemich 0:d7bd7384a37c 938 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
grzemich 0:d7bd7384a37c 939 TCP_EVENT_POLL(prev, err);
grzemich 0:d7bd7384a37c 940 /* if err == ERR_ABRT, 'prev' is already deallocated */
grzemich 0:d7bd7384a37c 941 if (err == ERR_OK) {
grzemich 0:d7bd7384a37c 942 tcp_output(prev);
grzemich 0:d7bd7384a37c 943 }
grzemich 0:d7bd7384a37c 944 }
grzemich 0:d7bd7384a37c 945 }
grzemich 0:d7bd7384a37c 946 }
grzemich 0:d7bd7384a37c 947
grzemich 0:d7bd7384a37c 948
grzemich 0:d7bd7384a37c 949 /* Steps through all of the TIME-WAIT PCBs. */
grzemich 0:d7bd7384a37c 950 prev = NULL;
grzemich 0:d7bd7384a37c 951 pcb = tcp_tw_pcbs;
grzemich 0:d7bd7384a37c 952 while (pcb != NULL) {
grzemich 0:d7bd7384a37c 953 LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
grzemich 0:d7bd7384a37c 954 pcb_remove = 0;
grzemich 0:d7bd7384a37c 955
grzemich 0:d7bd7384a37c 956 /* Check if this PCB has stayed long enough in TIME-WAIT */
grzemich 0:d7bd7384a37c 957 if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
grzemich 0:d7bd7384a37c 958 ++pcb_remove;
grzemich 0:d7bd7384a37c 959 }
grzemich 0:d7bd7384a37c 960
grzemich 0:d7bd7384a37c 961
grzemich 0:d7bd7384a37c 962
grzemich 0:d7bd7384a37c 963 /* If the PCB should be removed, do it. */
grzemich 0:d7bd7384a37c 964 if (pcb_remove) {
grzemich 0:d7bd7384a37c 965 struct tcp_pcb *pcb2;
grzemich 0:d7bd7384a37c 966 tcp_pcb_purge(pcb);
grzemich 0:d7bd7384a37c 967 /* Remove PCB from tcp_tw_pcbs list. */
grzemich 0:d7bd7384a37c 968 if (prev != NULL) {
grzemich 0:d7bd7384a37c 969 LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
grzemich 0:d7bd7384a37c 970 prev->next = pcb->next;
grzemich 0:d7bd7384a37c 971 } else {
grzemich 0:d7bd7384a37c 972 /* This PCB was the first. */
grzemich 0:d7bd7384a37c 973 LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
grzemich 0:d7bd7384a37c 974 tcp_tw_pcbs = pcb->next;
grzemich 0:d7bd7384a37c 975 }
grzemich 0:d7bd7384a37c 976 pcb2 = pcb;
grzemich 0:d7bd7384a37c 977 pcb = pcb->next;
grzemich 0:d7bd7384a37c 978 memp_free(MEMP_TCP_PCB, pcb2);
grzemich 0:d7bd7384a37c 979 } else {
grzemich 0:d7bd7384a37c 980 prev = pcb;
grzemich 0:d7bd7384a37c 981 pcb = pcb->next;
grzemich 0:d7bd7384a37c 982 }
grzemich 0:d7bd7384a37c 983 }
grzemich 0:d7bd7384a37c 984 }
grzemich 0:d7bd7384a37c 985
grzemich 0:d7bd7384a37c 986 /**
grzemich 0:d7bd7384a37c 987 * Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
grzemich 0:d7bd7384a37c 988 * "refused" by upper layer (application) and sends delayed ACKs.
grzemich 0:d7bd7384a37c 989 *
grzemich 0:d7bd7384a37c 990 * Automatically called from tcp_tmr().
grzemich 0:d7bd7384a37c 991 */
grzemich 0:d7bd7384a37c 992 void
grzemich 0:d7bd7384a37c 993 tcp_fasttmr(void)
grzemich 0:d7bd7384a37c 994 {
grzemich 0:d7bd7384a37c 995 struct tcp_pcb *pcb = tcp_active_pcbs;
grzemich 0:d7bd7384a37c 996
grzemich 0:d7bd7384a37c 997 while(pcb != NULL) {
grzemich 0:d7bd7384a37c 998 struct tcp_pcb *next = pcb->next;
grzemich 0:d7bd7384a37c 999 /* If there is data which was previously "refused" by upper layer */
grzemich 0:d7bd7384a37c 1000 if (pcb->refused_data != NULL) {
grzemich 0:d7bd7384a37c 1001 /* Notify again application with data previously received. */
grzemich 0:d7bd7384a37c 1002 err_t err;
grzemich 0:d7bd7384a37c 1003 LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_fasttmr: notify kept packet\n"));
grzemich 0:d7bd7384a37c 1004 TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
grzemich 0:d7bd7384a37c 1005 if (err == ERR_OK) {
grzemich 0:d7bd7384a37c 1006 pcb->refused_data = NULL;
grzemich 0:d7bd7384a37c 1007 } else if (err == ERR_ABRT) {
grzemich 0:d7bd7384a37c 1008 /* if err == ERR_ABRT, 'pcb' is already deallocated */
grzemich 0:d7bd7384a37c 1009 pcb = NULL;
grzemich 0:d7bd7384a37c 1010 }
grzemich 0:d7bd7384a37c 1011 }
grzemich 0:d7bd7384a37c 1012
grzemich 0:d7bd7384a37c 1013 /* send delayed ACKs */
grzemich 0:d7bd7384a37c 1014 if (pcb && (pcb->flags & TF_ACK_DELAY)) {
grzemich 0:d7bd7384a37c 1015 LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
grzemich 0:d7bd7384a37c 1016 tcp_ack_now(pcb);
grzemich 0:d7bd7384a37c 1017 tcp_output(pcb);
grzemich 0:d7bd7384a37c 1018 pcb->flags &= ~(TF_ACK_DELAY | TF_ACK_NOW);
grzemich 0:d7bd7384a37c 1019 }
grzemich 0:d7bd7384a37c 1020
grzemich 0:d7bd7384a37c 1021 pcb = next;
grzemich 0:d7bd7384a37c 1022 }
grzemich 0:d7bd7384a37c 1023 }
grzemich 0:d7bd7384a37c 1024
grzemich 0:d7bd7384a37c 1025 /**
grzemich 0:d7bd7384a37c 1026 * Deallocates a list of TCP segments (tcp_seg structures).
grzemich 0:d7bd7384a37c 1027 *
grzemich 0:d7bd7384a37c 1028 * @param seg tcp_seg list of TCP segments to free
grzemich 0:d7bd7384a37c 1029 */
grzemich 0:d7bd7384a37c 1030 void
grzemich 0:d7bd7384a37c 1031 tcp_segs_free(struct tcp_seg *seg)
grzemich 0:d7bd7384a37c 1032 {
grzemich 0:d7bd7384a37c 1033 while (seg != NULL) {
grzemich 0:d7bd7384a37c 1034 struct tcp_seg *next = seg->next;
grzemich 0:d7bd7384a37c 1035 tcp_seg_free(seg);
grzemich 0:d7bd7384a37c 1036 seg = next;
grzemich 0:d7bd7384a37c 1037 }
grzemich 0:d7bd7384a37c 1038 }
grzemich 0:d7bd7384a37c 1039
grzemich 0:d7bd7384a37c 1040 /**
grzemich 0:d7bd7384a37c 1041 * Frees a TCP segment (tcp_seg structure).
grzemich 0:d7bd7384a37c 1042 *
grzemich 0:d7bd7384a37c 1043 * @param seg single tcp_seg to free
grzemich 0:d7bd7384a37c 1044 */
grzemich 0:d7bd7384a37c 1045 void
grzemich 0:d7bd7384a37c 1046 tcp_seg_free(struct tcp_seg *seg)
grzemich 0:d7bd7384a37c 1047 {
grzemich 0:d7bd7384a37c 1048 if (seg != NULL) {
grzemich 0:d7bd7384a37c 1049 if (seg->p != NULL) {
grzemich 0:d7bd7384a37c 1050 pbuf_free(seg->p);
grzemich 0:d7bd7384a37c 1051 #if TCP_DEBUG
grzemich 0:d7bd7384a37c 1052 seg->p = NULL;
grzemich 0:d7bd7384a37c 1053 #endif /* TCP_DEBUG */
grzemich 0:d7bd7384a37c 1054 }
grzemich 0:d7bd7384a37c 1055 memp_free(MEMP_TCP_SEG, seg);
grzemich 0:d7bd7384a37c 1056 }
grzemich 0:d7bd7384a37c 1057 }
grzemich 0:d7bd7384a37c 1058
grzemich 0:d7bd7384a37c 1059 /**
grzemich 0:d7bd7384a37c 1060 * Sets the priority of a connection.
grzemich 0:d7bd7384a37c 1061 *
grzemich 0:d7bd7384a37c 1062 * @param pcb the tcp_pcb to manipulate
grzemich 0:d7bd7384a37c 1063 * @param prio new priority
grzemich 0:d7bd7384a37c 1064 */
grzemich 0:d7bd7384a37c 1065 void
grzemich 0:d7bd7384a37c 1066 tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
grzemich 0:d7bd7384a37c 1067 {
grzemich 0:d7bd7384a37c 1068 pcb->prio = prio;
grzemich 0:d7bd7384a37c 1069 }
grzemich 0:d7bd7384a37c 1070
grzemich 0:d7bd7384a37c 1071 #if TCP_QUEUE_OOSEQ
grzemich 0:d7bd7384a37c 1072 /**
grzemich 0:d7bd7384a37c 1073 * Returns a copy of the given TCP segment.
grzemich 0:d7bd7384a37c 1074 * The pbuf and data are not copied, only the pointers
grzemich 0:d7bd7384a37c 1075 *
grzemich 0:d7bd7384a37c 1076 * @param seg the old tcp_seg
grzemich 0:d7bd7384a37c 1077 * @return a copy of seg
grzemich 0:d7bd7384a37c 1078 */
grzemich 0:d7bd7384a37c 1079 struct tcp_seg *
grzemich 0:d7bd7384a37c 1080 tcp_seg_copy(struct tcp_seg *seg)
grzemich 0:d7bd7384a37c 1081 {
grzemich 0:d7bd7384a37c 1082 struct tcp_seg *cseg;
grzemich 0:d7bd7384a37c 1083
grzemich 0:d7bd7384a37c 1084 cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG);
grzemich 0:d7bd7384a37c 1085 if (cseg == NULL) {
grzemich 0:d7bd7384a37c 1086 return NULL;
grzemich 0:d7bd7384a37c 1087 }
grzemich 0:d7bd7384a37c 1088 SMEMCPY((u8_t *)cseg, (const u8_t *)seg, sizeof(struct tcp_seg));
grzemich 0:d7bd7384a37c 1089 pbuf_ref(cseg->p);
grzemich 0:d7bd7384a37c 1090 return cseg;
grzemich 0:d7bd7384a37c 1091 }
grzemich 0:d7bd7384a37c 1092 #endif /* TCP_QUEUE_OOSEQ */
grzemich 0:d7bd7384a37c 1093
grzemich 0:d7bd7384a37c 1094 #if LWIP_CALLBACK_API
grzemich 0:d7bd7384a37c 1095 /**
grzemich 0:d7bd7384a37c 1096 * Default receive callback that is called if the user didn't register
grzemich 0:d7bd7384a37c 1097 * a recv callback for the pcb.
grzemich 0:d7bd7384a37c 1098 */
grzemich 0:d7bd7384a37c 1099 err_t
grzemich 0:d7bd7384a37c 1100 tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
grzemich 0:d7bd7384a37c 1101 {
grzemich 0:d7bd7384a37c 1102 LWIP_UNUSED_ARG(arg);
grzemich 0:d7bd7384a37c 1103 if (p != NULL) {
grzemich 0:d7bd7384a37c 1104 tcp_recved(pcb, p->tot_len);
grzemich 0:d7bd7384a37c 1105 pbuf_free(p);
grzemich 0:d7bd7384a37c 1106 } else if (err == ERR_OK) {
grzemich 0:d7bd7384a37c 1107 return tcp_close(pcb);
grzemich 0:d7bd7384a37c 1108 }
grzemich 0:d7bd7384a37c 1109 return ERR_OK;
grzemich 0:d7bd7384a37c 1110 }
grzemich 0:d7bd7384a37c 1111 #endif /* LWIP_CALLBACK_API */
grzemich 0:d7bd7384a37c 1112
grzemich 0:d7bd7384a37c 1113 /**
grzemich 0:d7bd7384a37c 1114 * Kills the oldest active connection that has lower priority than prio.
grzemich 0:d7bd7384a37c 1115 *
grzemich 0:d7bd7384a37c 1116 * @param prio minimum priority
grzemich 0:d7bd7384a37c 1117 */
grzemich 0:d7bd7384a37c 1118 static void
grzemich 0:d7bd7384a37c 1119 tcp_kill_prio(u8_t prio)
grzemich 0:d7bd7384a37c 1120 {
grzemich 0:d7bd7384a37c 1121 struct tcp_pcb *pcb, *inactive;
grzemich 0:d7bd7384a37c 1122 u32_t inactivity;
grzemich 0:d7bd7384a37c 1123 u8_t mprio;
grzemich 0:d7bd7384a37c 1124
grzemich 0:d7bd7384a37c 1125
grzemich 0:d7bd7384a37c 1126 mprio = TCP_PRIO_MAX;
grzemich 0:d7bd7384a37c 1127
grzemich 0:d7bd7384a37c 1128 /* We kill the oldest active connection that has lower priority than prio. */
grzemich 0:d7bd7384a37c 1129 inactivity = 0;
grzemich 0:d7bd7384a37c 1130 inactive = NULL;
grzemich 0:d7bd7384a37c 1131 for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
grzemich 0:d7bd7384a37c 1132 if (pcb->prio <= prio &&
grzemich 0:d7bd7384a37c 1133 pcb->prio <= mprio &&
grzemich 0:d7bd7384a37c 1134 (u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
grzemich 0:d7bd7384a37c 1135 inactivity = tcp_ticks - pcb->tmr;
grzemich 0:d7bd7384a37c 1136 inactive = pcb;
grzemich 0:d7bd7384a37c 1137 mprio = pcb->prio;
grzemich 0:d7bd7384a37c 1138 }
grzemich 0:d7bd7384a37c 1139 }
grzemich 0:d7bd7384a37c 1140 if (inactive != NULL) {
grzemich 0:d7bd7384a37c 1141 LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n",
grzemich 0:d7bd7384a37c 1142 (void *)inactive, inactivity));
grzemich 0:d7bd7384a37c 1143 tcp_abort(inactive);
grzemich 0:d7bd7384a37c 1144 }
grzemich 0:d7bd7384a37c 1145 }
grzemich 0:d7bd7384a37c 1146
grzemich 0:d7bd7384a37c 1147 /**
grzemich 0:d7bd7384a37c 1148 * Kills the oldest connection that is in TIME_WAIT state.
grzemich 0:d7bd7384a37c 1149 * Called from tcp_alloc() if no more connections are available.
grzemich 0:d7bd7384a37c 1150 */
grzemich 0:d7bd7384a37c 1151 static void
grzemich 0:d7bd7384a37c 1152 tcp_kill_timewait(void)
grzemich 0:d7bd7384a37c 1153 {
grzemich 0:d7bd7384a37c 1154 struct tcp_pcb *pcb, *inactive;
grzemich 0:d7bd7384a37c 1155 u32_t inactivity;
grzemich 0:d7bd7384a37c 1156
grzemich 0:d7bd7384a37c 1157 inactivity = 0;
grzemich 0:d7bd7384a37c 1158 inactive = NULL;
grzemich 0:d7bd7384a37c 1159 /* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
grzemich 0:d7bd7384a37c 1160 for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
grzemich 0:d7bd7384a37c 1161 if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
grzemich 0:d7bd7384a37c 1162 inactivity = tcp_ticks - pcb->tmr;
grzemich 0:d7bd7384a37c 1163 inactive = pcb;
grzemich 0:d7bd7384a37c 1164 }
grzemich 0:d7bd7384a37c 1165 }
grzemich 0:d7bd7384a37c 1166 if (inactive != NULL) {
grzemich 0:d7bd7384a37c 1167 LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n",
grzemich 0:d7bd7384a37c 1168 (void *)inactive, inactivity));
grzemich 0:d7bd7384a37c 1169 tcp_abort(inactive);
grzemich 0:d7bd7384a37c 1170 }
grzemich 0:d7bd7384a37c 1171 }
grzemich 0:d7bd7384a37c 1172
grzemich 0:d7bd7384a37c 1173 /**
grzemich 0:d7bd7384a37c 1174 * Allocate a new tcp_pcb structure.
grzemich 0:d7bd7384a37c 1175 *
grzemich 0:d7bd7384a37c 1176 * @param prio priority for the new pcb
grzemich 0:d7bd7384a37c 1177 * @return a new tcp_pcb that initially is in state CLOSED
grzemich 0:d7bd7384a37c 1178 */
grzemich 0:d7bd7384a37c 1179 struct tcp_pcb *
grzemich 0:d7bd7384a37c 1180 tcp_alloc(u8_t prio)
grzemich 0:d7bd7384a37c 1181 {
grzemich 0:d7bd7384a37c 1182 struct tcp_pcb *pcb;
grzemich 0:d7bd7384a37c 1183 u32_t iss;
grzemich 0:d7bd7384a37c 1184
grzemich 0:d7bd7384a37c 1185 pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
grzemich 0:d7bd7384a37c 1186 if (pcb == NULL) {
grzemich 0:d7bd7384a37c 1187 /* Try killing oldest connection in TIME-WAIT. */
grzemich 0:d7bd7384a37c 1188 LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
grzemich 0:d7bd7384a37c 1189 tcp_kill_timewait();
grzemich 0:d7bd7384a37c 1190 /* Try to allocate a tcp_pcb again. */
grzemich 0:d7bd7384a37c 1191 pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
grzemich 0:d7bd7384a37c 1192 if (pcb == NULL) {
grzemich 0:d7bd7384a37c 1193 /* Try killing active connections with lower priority than the new one. */
grzemich 0:d7bd7384a37c 1194 LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing connection with prio lower than %d\n", prio));
grzemich 0:d7bd7384a37c 1195 tcp_kill_prio(prio);
grzemich 0:d7bd7384a37c 1196 /* Try to allocate a tcp_pcb again. */
grzemich 0:d7bd7384a37c 1197 pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
grzemich 0:d7bd7384a37c 1198 if (pcb != NULL) {
grzemich 0:d7bd7384a37c 1199 /* adjust err stats: memp_malloc failed twice before */
grzemich 0:d7bd7384a37c 1200 MEMP_STATS_DEC(err, MEMP_TCP_PCB);
grzemich 0:d7bd7384a37c 1201 }
grzemich 0:d7bd7384a37c 1202 }
grzemich 0:d7bd7384a37c 1203 if (pcb != NULL) {
grzemich 0:d7bd7384a37c 1204 /* adjust err stats: timewait PCB was freed above */
grzemich 0:d7bd7384a37c 1205 MEMP_STATS_DEC(err, MEMP_TCP_PCB);
grzemich 0:d7bd7384a37c 1206 }
grzemich 0:d7bd7384a37c 1207 }
grzemich 0:d7bd7384a37c 1208 if (pcb != NULL) {
grzemich 0:d7bd7384a37c 1209 memset(pcb, 0, sizeof(struct tcp_pcb));
grzemich 0:d7bd7384a37c 1210 pcb->prio = prio;
grzemich 0:d7bd7384a37c 1211 pcb->snd_buf = TCP_SND_BUF;
grzemich 0:d7bd7384a37c 1212 pcb->snd_queuelen = 0;
grzemich 0:d7bd7384a37c 1213 pcb->rcv_wnd = TCP_WND;
grzemich 0:d7bd7384a37c 1214 pcb->rcv_ann_wnd = TCP_WND;
grzemich 0:d7bd7384a37c 1215 pcb->tos = 0;
grzemich 0:d7bd7384a37c 1216 pcb->ttl = TCP_TTL;
grzemich 0:d7bd7384a37c 1217 /* As initial send MSS, we use TCP_MSS but limit it to 536.
grzemich 0:d7bd7384a37c 1218 The send MSS is updated when an MSS option is received. */
grzemich 0:d7bd7384a37c 1219 pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
grzemich 0:d7bd7384a37c 1220 pcb->rto = 3000 / TCP_SLOW_INTERVAL;
grzemich 0:d7bd7384a37c 1221 pcb->sa = 0;
grzemich 0:d7bd7384a37c 1222 pcb->sv = 3000 / TCP_SLOW_INTERVAL;
grzemich 0:d7bd7384a37c 1223 pcb->rtime = -1;
grzemich 0:d7bd7384a37c 1224 pcb->cwnd = 1;
grzemich 0:d7bd7384a37c 1225 iss = tcp_next_iss();
grzemich 0:d7bd7384a37c 1226 pcb->snd_wl2 = iss;
grzemich 0:d7bd7384a37c 1227 pcb->snd_nxt = iss;
grzemich 0:d7bd7384a37c 1228 pcb->lastack = iss;
grzemich 0:d7bd7384a37c 1229 pcb->snd_lbb = iss;
grzemich 0:d7bd7384a37c 1230 pcb->tmr = tcp_ticks;
grzemich 0:d7bd7384a37c 1231
grzemich 0:d7bd7384a37c 1232 pcb->polltmr = 0;
grzemich 0:d7bd7384a37c 1233
grzemich 0:d7bd7384a37c 1234 #if LWIP_CALLBACK_API
grzemich 0:d7bd7384a37c 1235 pcb->recv = tcp_recv_null;
grzemich 0:d7bd7384a37c 1236 #endif /* LWIP_CALLBACK_API */
grzemich 0:d7bd7384a37c 1237
grzemich 0:d7bd7384a37c 1238 /* Init KEEPALIVE timer */
grzemich 0:d7bd7384a37c 1239 pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
grzemich 0:d7bd7384a37c 1240
grzemich 0:d7bd7384a37c 1241 #if LWIP_TCP_KEEPALIVE
grzemich 0:d7bd7384a37c 1242 pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
grzemich 0:d7bd7384a37c 1243 pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
grzemich 0:d7bd7384a37c 1244 #endif /* LWIP_TCP_KEEPALIVE */
grzemich 0:d7bd7384a37c 1245
grzemich 0:d7bd7384a37c 1246 pcb->keep_cnt_sent = 0;
grzemich 0:d7bd7384a37c 1247 }
grzemich 0:d7bd7384a37c 1248 return pcb;
grzemich 0:d7bd7384a37c 1249 }
grzemich 0:d7bd7384a37c 1250
grzemich 0:d7bd7384a37c 1251 /**
grzemich 0:d7bd7384a37c 1252 * Creates a new TCP protocol control block but doesn't place it on
grzemich 0:d7bd7384a37c 1253 * any of the TCP PCB lists.
grzemich 0:d7bd7384a37c 1254 * The pcb is not put on any list until binding using tcp_bind().
grzemich 0:d7bd7384a37c 1255 *
grzemich 0:d7bd7384a37c 1256 * @internal: Maybe there should be a idle TCP PCB list where these
grzemich 0:d7bd7384a37c 1257 * PCBs are put on. Port reservation using tcp_bind() is implemented but
grzemich 0:d7bd7384a37c 1258 * allocated pcbs that are not bound can't be killed automatically if wanting
grzemich 0:d7bd7384a37c 1259 * to allocate a pcb with higher prio (@see tcp_kill_prio())
grzemich 0:d7bd7384a37c 1260 *
grzemich 0:d7bd7384a37c 1261 * @return a new tcp_pcb that initially is in state CLOSED
grzemich 0:d7bd7384a37c 1262 */
grzemich 0:d7bd7384a37c 1263 struct tcp_pcb *
grzemich 0:d7bd7384a37c 1264 tcp_new(void)
grzemich 0:d7bd7384a37c 1265 {
grzemich 0:d7bd7384a37c 1266 return tcp_alloc(TCP_PRIO_NORMAL);
grzemich 0:d7bd7384a37c 1267 }
grzemich 0:d7bd7384a37c 1268
grzemich 0:d7bd7384a37c 1269 /**
grzemich 0:d7bd7384a37c 1270 * Used to specify the argument that should be passed callback
grzemich 0:d7bd7384a37c 1271 * functions.
grzemich 0:d7bd7384a37c 1272 *
grzemich 0:d7bd7384a37c 1273 * @param pcb tcp_pcb to set the callback argument
grzemich 0:d7bd7384a37c 1274 * @param arg void pointer argument to pass to callback functions
grzemich 0:d7bd7384a37c 1275 */
grzemich 0:d7bd7384a37c 1276 void
grzemich 0:d7bd7384a37c 1277 tcp_arg(struct tcp_pcb *pcb, void *arg)
grzemich 0:d7bd7384a37c 1278 {
grzemich 0:d7bd7384a37c 1279 pcb->callback_arg = arg;
grzemich 0:d7bd7384a37c 1280 }
grzemich 0:d7bd7384a37c 1281 #if LWIP_CALLBACK_API
grzemich 0:d7bd7384a37c 1282
grzemich 0:d7bd7384a37c 1283 /**
grzemich 0:d7bd7384a37c 1284 * Used to specify the function that should be called when a TCP
grzemich 0:d7bd7384a37c 1285 * connection receives data.
grzemich 0:d7bd7384a37c 1286 *
grzemich 0:d7bd7384a37c 1287 * @param pcb tcp_pcb to set the recv callback
grzemich 0:d7bd7384a37c 1288 * @param recv callback function to call for this pcb when data is received
grzemich 0:d7bd7384a37c 1289 */
grzemich 0:d7bd7384a37c 1290 void
grzemich 0:d7bd7384a37c 1291 tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
grzemich 0:d7bd7384a37c 1292 {
grzemich 0:d7bd7384a37c 1293 pcb->recv = recv;
grzemich 0:d7bd7384a37c 1294 }
grzemich 0:d7bd7384a37c 1295
grzemich 0:d7bd7384a37c 1296 /**
grzemich 0:d7bd7384a37c 1297 * Used to specify the function that should be called when TCP data
grzemich 0:d7bd7384a37c 1298 * has been successfully delivered to the remote host.
grzemich 0:d7bd7384a37c 1299 *
grzemich 0:d7bd7384a37c 1300 * @param pcb tcp_pcb to set the sent callback
grzemich 0:d7bd7384a37c 1301 * @param sent callback function to call for this pcb when data is successfully sent
grzemich 0:d7bd7384a37c 1302 */
grzemich 0:d7bd7384a37c 1303 void
grzemich 0:d7bd7384a37c 1304 tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
grzemich 0:d7bd7384a37c 1305 {
grzemich 0:d7bd7384a37c 1306 pcb->sent = sent;
grzemich 0:d7bd7384a37c 1307 }
grzemich 0:d7bd7384a37c 1308
grzemich 0:d7bd7384a37c 1309 /**
grzemich 0:d7bd7384a37c 1310 * Used to specify the function that should be called when a fatal error
grzemich 0:d7bd7384a37c 1311 * has occured on the connection.
grzemich 0:d7bd7384a37c 1312 *
grzemich 0:d7bd7384a37c 1313 * @param pcb tcp_pcb to set the err callback
grzemich 0:d7bd7384a37c 1314 * @param err callback function to call for this pcb when a fatal error
grzemich 0:d7bd7384a37c 1315 * has occured on the connection
grzemich 0:d7bd7384a37c 1316 */
grzemich 0:d7bd7384a37c 1317 void
grzemich 0:d7bd7384a37c 1318 tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
grzemich 0:d7bd7384a37c 1319 {
grzemich 0:d7bd7384a37c 1320 pcb->errf = err;
grzemich 0:d7bd7384a37c 1321 }
grzemich 0:d7bd7384a37c 1322
grzemich 0:d7bd7384a37c 1323 /**
grzemich 0:d7bd7384a37c 1324 * Used for specifying the function that should be called when a
grzemich 0:d7bd7384a37c 1325 * LISTENing connection has been connected to another host.
grzemich 0:d7bd7384a37c 1326 *
grzemich 0:d7bd7384a37c 1327 * @param pcb tcp_pcb to set the accept callback
grzemich 0:d7bd7384a37c 1328 * @param accept callback function to call for this pcb when LISTENing
grzemich 0:d7bd7384a37c 1329 * connection has been connected to another host
grzemich 0:d7bd7384a37c 1330 */
grzemich 0:d7bd7384a37c 1331 void
grzemich 0:d7bd7384a37c 1332 tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
grzemich 0:d7bd7384a37c 1333 {
grzemich 0:d7bd7384a37c 1334 pcb->accept = accept;
grzemich 0:d7bd7384a37c 1335 }
grzemich 0:d7bd7384a37c 1336 #endif /* LWIP_CALLBACK_API */
grzemich 0:d7bd7384a37c 1337
grzemich 0:d7bd7384a37c 1338
grzemich 0:d7bd7384a37c 1339 /**
grzemich 0:d7bd7384a37c 1340 * Used to specify the function that should be called periodically
grzemich 0:d7bd7384a37c 1341 * from TCP. The interval is specified in terms of the TCP coarse
grzemich 0:d7bd7384a37c 1342 * timer interval, which is called twice a second.
grzemich 0:d7bd7384a37c 1343 *
grzemich 0:d7bd7384a37c 1344 */
grzemich 0:d7bd7384a37c 1345 void
grzemich 0:d7bd7384a37c 1346 tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
grzemich 0:d7bd7384a37c 1347 {
grzemich 0:d7bd7384a37c 1348 #if LWIP_CALLBACK_API
grzemich 0:d7bd7384a37c 1349 pcb->poll = poll;
grzemich 0:d7bd7384a37c 1350 #else /* LWIP_CALLBACK_API */
grzemich 0:d7bd7384a37c 1351 LWIP_UNUSED_ARG(poll);
grzemich 0:d7bd7384a37c 1352 #endif /* LWIP_CALLBACK_API */
grzemich 0:d7bd7384a37c 1353 pcb->pollinterval = interval;
grzemich 0:d7bd7384a37c 1354 }
grzemich 0:d7bd7384a37c 1355
grzemich 0:d7bd7384a37c 1356 /**
grzemich 0:d7bd7384a37c 1357 * Purges a TCP PCB. Removes any buffered data and frees the buffer memory
grzemich 0:d7bd7384a37c 1358 * (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
grzemich 0:d7bd7384a37c 1359 *
grzemich 0:d7bd7384a37c 1360 * @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
grzemich 0:d7bd7384a37c 1361 */
grzemich 0:d7bd7384a37c 1362 void
grzemich 0:d7bd7384a37c 1363 tcp_pcb_purge(struct tcp_pcb *pcb)
grzemich 0:d7bd7384a37c 1364 {
grzemich 0:d7bd7384a37c 1365 if (pcb->state != CLOSED &&
grzemich 0:d7bd7384a37c 1366 pcb->state != TIME_WAIT &&
grzemich 0:d7bd7384a37c 1367 pcb->state != LISTEN) {
grzemich 0:d7bd7384a37c 1368
grzemich 0:d7bd7384a37c 1369 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
grzemich 0:d7bd7384a37c 1370
grzemich 0:d7bd7384a37c 1371 #if TCP_LISTEN_BACKLOG
grzemich 0:d7bd7384a37c 1372 if (pcb->state == SYN_RCVD) {
grzemich 0:d7bd7384a37c 1373 /* Need to find the corresponding listen_pcb and decrease its accepts_pending */
grzemich 0:d7bd7384a37c 1374 struct tcp_pcb_listen *lpcb;
grzemich 0:d7bd7384a37c 1375 LWIP_ASSERT("tcp_pcb_purge: pcb->state == SYN_RCVD but tcp_listen_pcbs is NULL",
grzemich 0:d7bd7384a37c 1376 tcp_listen_pcbs.listen_pcbs != NULL);
grzemich 0:d7bd7384a37c 1377 for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
grzemich 0:d7bd7384a37c 1378 if ((lpcb->local_port == pcb->local_port) &&
grzemich 0:d7bd7384a37c 1379 (ip_addr_isany(&lpcb->local_ip) ||
grzemich 0:d7bd7384a37c 1380 ip_addr_cmp(&pcb->local_ip, &lpcb->local_ip))) {
grzemich 0:d7bd7384a37c 1381 /* port and address of the listen pcb match the timed-out pcb */
grzemich 0:d7bd7384a37c 1382 LWIP_ASSERT("tcp_pcb_purge: listen pcb does not have accepts pending",
grzemich 0:d7bd7384a37c 1383 lpcb->accepts_pending > 0);
grzemich 0:d7bd7384a37c 1384 lpcb->accepts_pending--;
grzemich 0:d7bd7384a37c 1385 break;
grzemich 0:d7bd7384a37c 1386 }
grzemich 0:d7bd7384a37c 1387 }
grzemich 0:d7bd7384a37c 1388 }
grzemich 0:d7bd7384a37c 1389 #endif /* TCP_LISTEN_BACKLOG */
grzemich 0:d7bd7384a37c 1390
grzemich 0:d7bd7384a37c 1391
grzemich 0:d7bd7384a37c 1392 if (pcb->refused_data != NULL) {
grzemich 0:d7bd7384a37c 1393 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
grzemich 0:d7bd7384a37c 1394 pbuf_free(pcb->refused_data);
grzemich 0:d7bd7384a37c 1395 pcb->refused_data = NULL;
grzemich 0:d7bd7384a37c 1396 }
grzemich 0:d7bd7384a37c 1397 if (pcb->unsent != NULL) {
grzemich 0:d7bd7384a37c 1398 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
grzemich 0:d7bd7384a37c 1399 }
grzemich 0:d7bd7384a37c 1400 if (pcb->unacked != NULL) {
grzemich 0:d7bd7384a37c 1401 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
grzemich 0:d7bd7384a37c 1402 }
grzemich 0:d7bd7384a37c 1403 #if TCP_QUEUE_OOSEQ
grzemich 0:d7bd7384a37c 1404 if (pcb->ooseq != NULL) {
grzemich 0:d7bd7384a37c 1405 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
grzemich 0:d7bd7384a37c 1406 }
grzemich 0:d7bd7384a37c 1407 tcp_segs_free(pcb->ooseq);
grzemich 0:d7bd7384a37c 1408 pcb->ooseq = NULL;
grzemich 0:d7bd7384a37c 1409 #endif /* TCP_QUEUE_OOSEQ */
grzemich 0:d7bd7384a37c 1410
grzemich 0:d7bd7384a37c 1411 /* Stop the retransmission timer as it will expect data on unacked
grzemich 0:d7bd7384a37c 1412 queue if it fires */
grzemich 0:d7bd7384a37c 1413 pcb->rtime = -1;
grzemich 0:d7bd7384a37c 1414
grzemich 0:d7bd7384a37c 1415 tcp_segs_free(pcb->unsent);
grzemich 0:d7bd7384a37c 1416 tcp_segs_free(pcb->unacked);
grzemich 0:d7bd7384a37c 1417 pcb->unacked = pcb->unsent = NULL;
grzemich 0:d7bd7384a37c 1418 #if TCP_OVERSIZE
grzemich 0:d7bd7384a37c 1419 pcb->unsent_oversize = 0;
grzemich 0:d7bd7384a37c 1420 #endif /* TCP_OVERSIZE */
grzemich 0:d7bd7384a37c 1421 }
grzemich 0:d7bd7384a37c 1422 }
grzemich 0:d7bd7384a37c 1423
grzemich 0:d7bd7384a37c 1424 /**
grzemich 0:d7bd7384a37c 1425 * Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
grzemich 0:d7bd7384a37c 1426 *
grzemich 0:d7bd7384a37c 1427 * @param pcblist PCB list to purge.
grzemich 0:d7bd7384a37c 1428 * @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
grzemich 0:d7bd7384a37c 1429 */
grzemich 0:d7bd7384a37c 1430 void
grzemich 0:d7bd7384a37c 1431 tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb)
grzemich 0:d7bd7384a37c 1432 {
grzemich 0:d7bd7384a37c 1433 TCP_RMV(pcblist, pcb);
grzemich 0:d7bd7384a37c 1434
grzemich 0:d7bd7384a37c 1435 tcp_pcb_purge(pcb);
grzemich 0:d7bd7384a37c 1436
grzemich 0:d7bd7384a37c 1437 /* if there is an outstanding delayed ACKs, send it */
grzemich 0:d7bd7384a37c 1438 if (pcb->state != TIME_WAIT &&
grzemich 0:d7bd7384a37c 1439 pcb->state != LISTEN &&
grzemich 0:d7bd7384a37c 1440 pcb->flags & TF_ACK_DELAY) {
grzemich 0:d7bd7384a37c 1441 pcb->flags |= TF_ACK_NOW;
grzemich 0:d7bd7384a37c 1442 tcp_output(pcb);
grzemich 0:d7bd7384a37c 1443 }
grzemich 0:d7bd7384a37c 1444
grzemich 0:d7bd7384a37c 1445 if (pcb->state != LISTEN) {
grzemich 0:d7bd7384a37c 1446 LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
grzemich 0:d7bd7384a37c 1447 LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
grzemich 0:d7bd7384a37c 1448 #if TCP_QUEUE_OOSEQ
grzemich 0:d7bd7384a37c 1449 LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
grzemich 0:d7bd7384a37c 1450 #endif /* TCP_QUEUE_OOSEQ */
grzemich 0:d7bd7384a37c 1451 }
grzemich 0:d7bd7384a37c 1452
grzemich 0:d7bd7384a37c 1453 pcb->state = CLOSED;
grzemich 0:d7bd7384a37c 1454
grzemich 0:d7bd7384a37c 1455 LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
grzemich 0:d7bd7384a37c 1456 }
grzemich 0:d7bd7384a37c 1457
grzemich 0:d7bd7384a37c 1458 /**
grzemich 0:d7bd7384a37c 1459 * Calculates a new initial sequence number for new connections.
grzemich 0:d7bd7384a37c 1460 *
grzemich 0:d7bd7384a37c 1461 * @return u32_t pseudo random sequence number
grzemich 0:d7bd7384a37c 1462 */
grzemich 0:d7bd7384a37c 1463 u32_t
grzemich 0:d7bd7384a37c 1464 tcp_next_iss(void)
grzemich 0:d7bd7384a37c 1465 {
grzemich 0:d7bd7384a37c 1466 static u32_t iss = 6510;
grzemich 0:d7bd7384a37c 1467
grzemich 0:d7bd7384a37c 1468 iss += tcp_ticks; /* XXX */
grzemich 0:d7bd7384a37c 1469 return iss;
grzemich 0:d7bd7384a37c 1470 }
grzemich 0:d7bd7384a37c 1471
grzemich 0:d7bd7384a37c 1472 #if TCP_CALCULATE_EFF_SEND_MSS
grzemich 0:d7bd7384a37c 1473 /**
grzemich 0:d7bd7384a37c 1474 * Calcluates the effective send mss that can be used for a specific IP address
grzemich 0:d7bd7384a37c 1475 * by using ip_route to determin the netif used to send to the address and
grzemich 0:d7bd7384a37c 1476 * calculating the minimum of TCP_MSS and that netif's mtu (if set).
grzemich 0:d7bd7384a37c 1477 */
grzemich 0:d7bd7384a37c 1478 u16_t
grzemich 0:d7bd7384a37c 1479 tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr)
grzemich 0:d7bd7384a37c 1480 {
grzemich 0:d7bd7384a37c 1481 u16_t mss_s;
grzemich 0:d7bd7384a37c 1482 struct netif *outif;
grzemich 0:d7bd7384a37c 1483
grzemich 0:d7bd7384a37c 1484 outif = ip_route(addr);
grzemich 0:d7bd7384a37c 1485 if ((outif != NULL) && (outif->mtu != 0)) {
grzemich 0:d7bd7384a37c 1486 mss_s = outif->mtu - IP_HLEN - TCP_HLEN;
grzemich 0:d7bd7384a37c 1487 /* RFC 1122, chap 4.2.2.6:
grzemich 0:d7bd7384a37c 1488 * Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
grzemich 0:d7bd7384a37c 1489 * We correct for TCP options in tcp_write(), and don't support IP options.
grzemich 0:d7bd7384a37c 1490 */
grzemich 0:d7bd7384a37c 1491 sendmss = LWIP_MIN(sendmss, mss_s);
grzemich 0:d7bd7384a37c 1492 }
grzemich 0:d7bd7384a37c 1493 return sendmss;
grzemich 0:d7bd7384a37c 1494 }
grzemich 0:d7bd7384a37c 1495 #endif /* TCP_CALCULATE_EFF_SEND_MSS */
grzemich 0:d7bd7384a37c 1496
grzemich 0:d7bd7384a37c 1497 const char*
grzemich 0:d7bd7384a37c 1498 tcp_debug_state_str(enum tcp_state s)
grzemich 0:d7bd7384a37c 1499 {
grzemich 0:d7bd7384a37c 1500 return tcp_state_str[s];
grzemich 0:d7bd7384a37c 1501 }
grzemich 0:d7bd7384a37c 1502
grzemich 0:d7bd7384a37c 1503 #if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
grzemich 0:d7bd7384a37c 1504 /**
grzemich 0:d7bd7384a37c 1505 * Print a tcp header for debugging purposes.
grzemich 0:d7bd7384a37c 1506 *
grzemich 0:d7bd7384a37c 1507 * @param tcphdr pointer to a struct tcp_hdr
grzemich 0:d7bd7384a37c 1508 */
grzemich 0:d7bd7384a37c 1509 void
grzemich 0:d7bd7384a37c 1510 tcp_debug_print(struct tcp_hdr *tcphdr)
grzemich 0:d7bd7384a37c 1511 {
grzemich 0:d7bd7384a37c 1512 LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
grzemich 0:d7bd7384a37c 1513 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
grzemich 0:d7bd7384a37c 1514 LWIP_DEBUGF(TCP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
grzemich 0:d7bd7384a37c 1515 ntohs(tcphdr->src), ntohs(tcphdr->dest)));
grzemich 0:d7bd7384a37c 1516 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
grzemich 0:d7bd7384a37c 1517 LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (seq no)\n",
grzemich 0:d7bd7384a37c 1518 ntohl(tcphdr->seqno)));
grzemich 0:d7bd7384a37c 1519 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
grzemich 0:d7bd7384a37c 1520 LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (ack no)\n",
grzemich 0:d7bd7384a37c 1521 ntohl(tcphdr->ackno)));
grzemich 0:d7bd7384a37c 1522 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
grzemich 0:d7bd7384a37c 1523 LWIP_DEBUGF(TCP_DEBUG, ("| %2"U16_F" | |%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"| %5"U16_F" | (hdrlen, flags (",
grzemich 0:d7bd7384a37c 1524 TCPH_HDRLEN(tcphdr),
grzemich 0:d7bd7384a37c 1525 TCPH_FLAGS(tcphdr) >> 5 & 1,
grzemich 0:d7bd7384a37c 1526 TCPH_FLAGS(tcphdr) >> 4 & 1,
grzemich 0:d7bd7384a37c 1527 TCPH_FLAGS(tcphdr) >> 3 & 1,
grzemich 0:d7bd7384a37c 1528 TCPH_FLAGS(tcphdr) >> 2 & 1,
grzemich 0:d7bd7384a37c 1529 TCPH_FLAGS(tcphdr) >> 1 & 1,
grzemich 0:d7bd7384a37c 1530 TCPH_FLAGS(tcphdr) & 1,
grzemich 0:d7bd7384a37c 1531 ntohs(tcphdr->wnd)));
grzemich 0:d7bd7384a37c 1532 tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
grzemich 0:d7bd7384a37c 1533 LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
grzemich 0:d7bd7384a37c 1534 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
grzemich 0:d7bd7384a37c 1535 LWIP_DEBUGF(TCP_DEBUG, ("| 0x%04"X16_F" | %5"U16_F" | (chksum, urgp)\n",
grzemich 0:d7bd7384a37c 1536 ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
grzemich 0:d7bd7384a37c 1537 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
grzemich 0:d7bd7384a37c 1538 }
grzemich 0:d7bd7384a37c 1539
grzemich 0:d7bd7384a37c 1540 /**
grzemich 0:d7bd7384a37c 1541 * Print a tcp state for debugging purposes.
grzemich 0:d7bd7384a37c 1542 *
grzemich 0:d7bd7384a37c 1543 * @param s enum tcp_state to print
grzemich 0:d7bd7384a37c 1544 */
grzemich 0:d7bd7384a37c 1545 void
grzemich 0:d7bd7384a37c 1546 tcp_debug_print_state(enum tcp_state s)
grzemich 0:d7bd7384a37c 1547 {
grzemich 0:d7bd7384a37c 1548 LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
grzemich 0:d7bd7384a37c 1549 }
grzemich 0:d7bd7384a37c 1550
grzemich 0:d7bd7384a37c 1551 /**
grzemich 0:d7bd7384a37c 1552 * Print tcp flags for debugging purposes.
grzemich 0:d7bd7384a37c 1553 *
grzemich 0:d7bd7384a37c 1554 * @param flags tcp flags, all active flags are printed
grzemich 0:d7bd7384a37c 1555 */
grzemich 0:d7bd7384a37c 1556 void
grzemich 0:d7bd7384a37c 1557 tcp_debug_print_flags(u8_t flags)
grzemich 0:d7bd7384a37c 1558 {
grzemich 0:d7bd7384a37c 1559 if (flags & TCP_FIN) {
grzemich 0:d7bd7384a37c 1560 LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
grzemich 0:d7bd7384a37c 1561 }
grzemich 0:d7bd7384a37c 1562 if (flags & TCP_SYN) {
grzemich 0:d7bd7384a37c 1563 LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
grzemich 0:d7bd7384a37c 1564 }
grzemich 0:d7bd7384a37c 1565 if (flags & TCP_RST) {
grzemich 0:d7bd7384a37c 1566 LWIP_DEBUGF(TCP_DEBUG, ("RST "));
grzemich 0:d7bd7384a37c 1567 }
grzemich 0:d7bd7384a37c 1568 if (flags & TCP_PSH) {
grzemich 0:d7bd7384a37c 1569 LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
grzemich 0:d7bd7384a37c 1570 }
grzemich 0:d7bd7384a37c 1571 if (flags & TCP_ACK) {
grzemich 0:d7bd7384a37c 1572 LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
grzemich 0:d7bd7384a37c 1573 }
grzemich 0:d7bd7384a37c 1574 if (flags & TCP_URG) {
grzemich 0:d7bd7384a37c 1575 LWIP_DEBUGF(TCP_DEBUG, ("URG "));
grzemich 0:d7bd7384a37c 1576 }
grzemich 0:d7bd7384a37c 1577 if (flags & TCP_ECE) {
grzemich 0:d7bd7384a37c 1578 LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
grzemich 0:d7bd7384a37c 1579 }
grzemich 0:d7bd7384a37c 1580 if (flags & TCP_CWR) {
grzemich 0:d7bd7384a37c 1581 LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
grzemich 0:d7bd7384a37c 1582 }
grzemich 0:d7bd7384a37c 1583 LWIP_DEBUGF(TCP_DEBUG, ("\n"));
grzemich 0:d7bd7384a37c 1584 }
grzemich 0:d7bd7384a37c 1585
grzemich 0:d7bd7384a37c 1586 /**
grzemich 0:d7bd7384a37c 1587 * Print all tcp_pcbs in every list for debugging purposes.
grzemich 0:d7bd7384a37c 1588 */
grzemich 0:d7bd7384a37c 1589 void
grzemich 0:d7bd7384a37c 1590 tcp_debug_print_pcbs(void)
grzemich 0:d7bd7384a37c 1591 {
grzemich 0:d7bd7384a37c 1592 struct tcp_pcb *pcb;
grzemich 0:d7bd7384a37c 1593 LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
grzemich 0:d7bd7384a37c 1594 for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
grzemich 0:d7bd7384a37c 1595 LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
grzemich 0:d7bd7384a37c 1596 pcb->local_port, pcb->remote_port,
grzemich 0:d7bd7384a37c 1597 pcb->snd_nxt, pcb->rcv_nxt));
grzemich 0:d7bd7384a37c 1598 tcp_debug_print_state(pcb->state);
grzemich 0:d7bd7384a37c 1599 }
grzemich 0:d7bd7384a37c 1600 LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
grzemich 0:d7bd7384a37c 1601 for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
grzemich 0:d7bd7384a37c 1602 LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
grzemich 0:d7bd7384a37c 1603 pcb->local_port, pcb->remote_port,
grzemich 0:d7bd7384a37c 1604 pcb->snd_nxt, pcb->rcv_nxt));
grzemich 0:d7bd7384a37c 1605 tcp_debug_print_state(pcb->state);
grzemich 0:d7bd7384a37c 1606 }
grzemich 0:d7bd7384a37c 1607 LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
grzemich 0:d7bd7384a37c 1608 for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
grzemich 0:d7bd7384a37c 1609 LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
grzemich 0:d7bd7384a37c 1610 pcb->local_port, pcb->remote_port,
grzemich 0:d7bd7384a37c 1611 pcb->snd_nxt, pcb->rcv_nxt));
grzemich 0:d7bd7384a37c 1612 tcp_debug_print_state(pcb->state);
grzemich 0:d7bd7384a37c 1613 }
grzemich 0:d7bd7384a37c 1614 }
grzemich 0:d7bd7384a37c 1615
grzemich 0:d7bd7384a37c 1616 /**
grzemich 0:d7bd7384a37c 1617 * Check state consistency of the tcp_pcb lists.
grzemich 0:d7bd7384a37c 1618 */
grzemich 0:d7bd7384a37c 1619 s16_t
grzemich 0:d7bd7384a37c 1620 tcp_pcbs_sane(void)
grzemich 0:d7bd7384a37c 1621 {
grzemich 0:d7bd7384a37c 1622 struct tcp_pcb *pcb;
grzemich 0:d7bd7384a37c 1623 for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
grzemich 0:d7bd7384a37c 1624 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
grzemich 0:d7bd7384a37c 1625 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
grzemich 0:d7bd7384a37c 1626 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
grzemich 0:d7bd7384a37c 1627 }
grzemich 0:d7bd7384a37c 1628 for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
grzemich 0:d7bd7384a37c 1629 LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
grzemich 0:d7bd7384a37c 1630 }
grzemich 0:d7bd7384a37c 1631 return 1;
grzemich 0:d7bd7384a37c 1632 }
grzemich 0:d7bd7384a37c 1633 #endif /* TCP_DEBUG */
grzemich 0:d7bd7384a37c 1634
grzemich 0:d7bd7384a37c 1635 #endif /* LWIP_TCP */