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Dependencies:   mbed

lwip/core/tcp.c@2:25e12a7fe0aa, 2012-09-06 (annotated)

Committer:
lorcansmith
Date:
Thu Sep 06 12:52:48 2012 +0000
Revision:
2:25e12a7fe0aa
Parent:
0:2a53a4c3238c 
Open source version 1.a

Who changed what in which revision?

UserRevisionLine numberNew contents of line
lorcansmith 0:2a53a4c3238c 1 /**
lorcansmith 0:2a53a4c3238c 2 * @file
lorcansmith 0:2a53a4c3238c 3 * Transmission Control Protocol for IP
lorcansmith 0:2a53a4c3238c 4 *
lorcansmith 0:2a53a4c3238c 5 * This file contains common functions for the TCP implementation, such as functinos
lorcansmith 0:2a53a4c3238c 6 * for manipulating the data structures and the TCP timer functions. TCP functions
lorcansmith 0:2a53a4c3238c 7 * related to input and output is found in tcp_in.c and tcp_out.c respectively.
lorcansmith 0:2a53a4c3238c 8 *
lorcansmith 0:2a53a4c3238c 9 */
lorcansmith 0:2a53a4c3238c 10
lorcansmith 0:2a53a4c3238c 11 /*
lorcansmith 0:2a53a4c3238c 12 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
lorcansmith 0:2a53a4c3238c 13 * All rights reserved.
lorcansmith 0:2a53a4c3238c 14 *
lorcansmith 0:2a53a4c3238c 15 * Redistribution and use in source and binary forms, with or without modification,
lorcansmith 0:2a53a4c3238c 16 * are permitted provided that the following conditions are met:
lorcansmith 0:2a53a4c3238c 17 *
lorcansmith 0:2a53a4c3238c 18 * 1. Redistributions of source code must retain the above copyright notice,
lorcansmith 0:2a53a4c3238c 19 * this list of conditions and the following disclaimer.
lorcansmith 0:2a53a4c3238c 20 * 2. Redistributions in binary form must reproduce the above copyright notice,
lorcansmith 0:2a53a4c3238c 21 * this list of conditions and the following disclaimer in the documentation
lorcansmith 0:2a53a4c3238c 22 * and/or other materials provided with the distribution.
lorcansmith 0:2a53a4c3238c 23 * 3. The name of the author may not be used to endorse or promote products
lorcansmith 0:2a53a4c3238c 24 * derived from this software without specific prior written permission.
lorcansmith 0:2a53a4c3238c 25 *
lorcansmith 0:2a53a4c3238c 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
lorcansmith 0:2a53a4c3238c 27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
lorcansmith 0:2a53a4c3238c 28 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
lorcansmith 0:2a53a4c3238c 29 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
lorcansmith 0:2a53a4c3238c 30 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
lorcansmith 0:2a53a4c3238c 31 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
lorcansmith 0:2a53a4c3238c 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
lorcansmith 0:2a53a4c3238c 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
lorcansmith 0:2a53a4c3238c 34 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
lorcansmith 0:2a53a4c3238c 35 * OF SUCH DAMAGE.
lorcansmith 0:2a53a4c3238c 36 *
lorcansmith 0:2a53a4c3238c 37 * This file is part of the lwIP TCP/IP stack.
lorcansmith 0:2a53a4c3238c 38 *
lorcansmith 0:2a53a4c3238c 39 * Author: Adam Dunkels <adam@sics.se>
lorcansmith 0:2a53a4c3238c 40 *
lorcansmith 0:2a53a4c3238c 41 */
lorcansmith 0:2a53a4c3238c 42
lorcansmith 0:2a53a4c3238c 43 #include "lwip/opt.h"
lorcansmith 0:2a53a4c3238c 44
lorcansmith 0:2a53a4c3238c 45 #if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
lorcansmith 0:2a53a4c3238c 46
lorcansmith 0:2a53a4c3238c 47 #include "lwip/def.h"
lorcansmith 0:2a53a4c3238c 48 #include "lwip/mem.h"
lorcansmith 0:2a53a4c3238c 49 #include "lwip/memp.h"
lorcansmith 0:2a53a4c3238c 50 #include "lwip/snmp.h"
lorcansmith 0:2a53a4c3238c 51 #include "lwip/tcp.h"
lorcansmith 0:2a53a4c3238c 52 #include "lwip/tcp_impl.h"
lorcansmith 0:2a53a4c3238c 53 #include "lwip/debug.h"
lorcansmith 0:2a53a4c3238c 54 #include "lwip/stats.h"
lorcansmith 0:2a53a4c3238c 55
lorcansmith 0:2a53a4c3238c 56 #include <string.h>
lorcansmith 0:2a53a4c3238c 57
lorcansmith 0:2a53a4c3238c 58 const char * const tcp_state_str[] = {
lorcansmith 0:2a53a4c3238c 59 "CLOSED",
lorcansmith 0:2a53a4c3238c 60 "LISTEN",
lorcansmith 0:2a53a4c3238c 61 "SYN_SENT",
lorcansmith 0:2a53a4c3238c 62 "SYN_RCVD",
lorcansmith 0:2a53a4c3238c 63 "ESTABLISHED",
lorcansmith 0:2a53a4c3238c 64 "FIN_WAIT_1",
lorcansmith 0:2a53a4c3238c 65 "FIN_WAIT_2",
lorcansmith 0:2a53a4c3238c 66 "CLOSE_WAIT",
lorcansmith 0:2a53a4c3238c 67 "CLOSING",
lorcansmith 0:2a53a4c3238c 68 "LAST_ACK",
lorcansmith 0:2a53a4c3238c 69 "TIME_WAIT"
lorcansmith 0:2a53a4c3238c 70 };
lorcansmith 0:2a53a4c3238c 71
lorcansmith 0:2a53a4c3238c 72 /* Incremented every coarse grained timer shot (typically every 500 ms). */
lorcansmith 0:2a53a4c3238c 73 u32_t tcp_ticks;
lorcansmith 0:2a53a4c3238c 74 const u8_t tcp_backoff[13] =
lorcansmith 0:2a53a4c3238c 75 { 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
lorcansmith 0:2a53a4c3238c 76 /* Times per slowtmr hits */
lorcansmith 0:2a53a4c3238c 77 const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
lorcansmith 0:2a53a4c3238c 78
lorcansmith 0:2a53a4c3238c 79 /* The TCP PCB lists. */
lorcansmith 0:2a53a4c3238c 80
lorcansmith 0:2a53a4c3238c 81 /** List of all TCP PCBs bound but not yet (connected || listening) */
lorcansmith 0:2a53a4c3238c 82 struct tcp_pcb *tcp_bound_pcbs;
lorcansmith 0:2a53a4c3238c 83 /** List of all TCP PCBs in LISTEN state */
lorcansmith 0:2a53a4c3238c 84 union tcp_listen_pcbs_t tcp_listen_pcbs;
lorcansmith 0:2a53a4c3238c 85 /** List of all TCP PCBs that are in a state in which
lorcansmith 0:2a53a4c3238c 86 * they accept or send data. */
lorcansmith 0:2a53a4c3238c 87 struct tcp_pcb *tcp_active_pcbs;
lorcansmith 0:2a53a4c3238c 88 /** List of all TCP PCBs in TIME-WAIT state */
lorcansmith 0:2a53a4c3238c 89 struct tcp_pcb *tcp_tw_pcbs;
lorcansmith 0:2a53a4c3238c 90
lorcansmith 0:2a53a4c3238c 91 #define NUM_TCP_PCB_LISTS 4
lorcansmith 0:2a53a4c3238c 92 #define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
lorcansmith 0:2a53a4c3238c 93 /** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
lorcansmith 0:2a53a4c3238c 94 struct tcp_pcb **tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
lorcansmith 0:2a53a4c3238c 95 &tcp_active_pcbs, &tcp_tw_pcbs};
lorcansmith 0:2a53a4c3238c 96
lorcansmith 0:2a53a4c3238c 97 /** Only used for temporary storage. */
lorcansmith 0:2a53a4c3238c 98 struct tcp_pcb *tcp_tmp_pcb;
lorcansmith 0:2a53a4c3238c 99
lorcansmith 0:2a53a4c3238c 100 /** Timer counter to handle calling slow-timer from tcp_tmr() */
lorcansmith 0:2a53a4c3238c 101 static u8_t tcp_timer;
lorcansmith 0:2a53a4c3238c 102 static u16_t tcp_new_port(void);
lorcansmith 0:2a53a4c3238c 103
lorcansmith 0:2a53a4c3238c 104 /**
lorcansmith 0:2a53a4c3238c 105 * Called periodically to dispatch TCP timers.
lorcansmith 0:2a53a4c3238c 106 *
lorcansmith 0:2a53a4c3238c 107 */
lorcansmith 0:2a53a4c3238c 108 void
lorcansmith 0:2a53a4c3238c 109 tcp_tmr(void)
lorcansmith 0:2a53a4c3238c 110 {
lorcansmith 0:2a53a4c3238c 111 /* Call tcp_fasttmr() every 250 ms */
lorcansmith 0:2a53a4c3238c 112 tcp_fasttmr();
lorcansmith 0:2a53a4c3238c 113
lorcansmith 0:2a53a4c3238c 114 if (++tcp_timer & 1) {
lorcansmith 0:2a53a4c3238c 115 /* Call tcp_tmr() every 500 ms, i.e., every other timer
lorcansmith 0:2a53a4c3238c 116 tcp_tmr() is called. */
lorcansmith 0:2a53a4c3238c 117 tcp_slowtmr();
lorcansmith 0:2a53a4c3238c 118 }
lorcansmith 0:2a53a4c3238c 119 }
lorcansmith 0:2a53a4c3238c 120
lorcansmith 0:2a53a4c3238c 121 /**
lorcansmith 0:2a53a4c3238c 122 * Closes the TX side of a connection held by the PCB.
lorcansmith 0:2a53a4c3238c 123 * For tcp_close(), a RST is sent if the application didn't receive all data
lorcansmith 0:2a53a4c3238c 124 * (tcp_recved() not called for all data passed to recv callback).
lorcansmith 0:2a53a4c3238c 125 *
lorcansmith 0:2a53a4c3238c 126 * Listening pcbs are freed and may not be referenced any more.
lorcansmith 0:2a53a4c3238c 127 * Connection pcbs are freed if not yet connected and may not be referenced
lorcansmith 0:2a53a4c3238c 128 * any more. If a connection is established (at least SYN received or in
lorcansmith 0:2a53a4c3238c 129 * a closing state), the connection is closed, and put in a closing state.
lorcansmith 0:2a53a4c3238c 130 * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
lorcansmith 0:2a53a4c3238c 131 * unsafe to reference it.
lorcansmith 0:2a53a4c3238c 132 *
lorcansmith 0:2a53a4c3238c 133 * @param pcb the tcp_pcb to close
lorcansmith 0:2a53a4c3238c 134 * @return ERR_OK if connection has been closed
lorcansmith 0:2a53a4c3238c 135 * another err_t if closing failed and pcb is not freed
lorcansmith 0:2a53a4c3238c 136 */
lorcansmith 0:2a53a4c3238c 137 static err_t
lorcansmith 0:2a53a4c3238c 138 tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
lorcansmith 0:2a53a4c3238c 139 {
lorcansmith 0:2a53a4c3238c 140 err_t err;
lorcansmith 0:2a53a4c3238c 141
lorcansmith 0:2a53a4c3238c 142 if (rst_on_unacked_data && (pcb->state != LISTEN)) {
lorcansmith 0:2a53a4c3238c 143 if ((pcb->refused_data != NULL) || (pcb->rcv_wnd != TCP_WND)) {
lorcansmith 0:2a53a4c3238c 144 /* Not all data received by application, send RST to tell the remote
lorcansmith 0:2a53a4c3238c 145 side about this. */
lorcansmith 0:2a53a4c3238c 146 LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
lorcansmith 0:2a53a4c3238c 147
lorcansmith 0:2a53a4c3238c 148 /* don't call tcp_abort here: we must not deallocate the pcb since
lorcansmith 0:2a53a4c3238c 149 that might not be expected when calling tcp_close */
lorcansmith 0:2a53a4c3238c 150 tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
lorcansmith 0:2a53a4c3238c 151 pcb->local_port, pcb->remote_port);
lorcansmith 0:2a53a4c3238c 152
lorcansmith 0:2a53a4c3238c 153 tcp_pcb_purge(pcb);
lorcansmith 0:2a53a4c3238c 154
lorcansmith 0:2a53a4c3238c 155 /* TODO: to which state do we move now? */
lorcansmith 0:2a53a4c3238c 156
lorcansmith 0:2a53a4c3238c 157 /* move to TIME_WAIT since we close actively */
lorcansmith 0:2a53a4c3238c 158 TCP_RMV(&tcp_active_pcbs, pcb);
lorcansmith 0:2a53a4c3238c 159 pcb->state = TIME_WAIT;
lorcansmith 0:2a53a4c3238c 160 TCP_REG(&tcp_tw_pcbs, pcb);
lorcansmith 0:2a53a4c3238c 161
lorcansmith 0:2a53a4c3238c 162 return ERR_OK;
lorcansmith 0:2a53a4c3238c 163 }
lorcansmith 0:2a53a4c3238c 164 }
lorcansmith 0:2a53a4c3238c 165
lorcansmith 0:2a53a4c3238c 166 switch (pcb->state) {
lorcansmith 0:2a53a4c3238c 167 case CLOSED:
lorcansmith 0:2a53a4c3238c 168 /* Closing a pcb in the CLOSED state might seem erroneous,
lorcansmith 0:2a53a4c3238c 169 * however, it is in this state once allocated and as yet unused
lorcansmith 0:2a53a4c3238c 170 * and the user needs some way to free it should the need arise.
lorcansmith 0:2a53a4c3238c 171 * Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
lorcansmith 0:2a53a4c3238c 172 * or for a pcb that has been used and then entered the CLOSED state
lorcansmith 0:2a53a4c3238c 173 * is erroneous, but this should never happen as the pcb has in those cases
lorcansmith 0:2a53a4c3238c 174 * been freed, and so any remaining handles are bogus. */
lorcansmith 0:2a53a4c3238c 175 err = ERR_OK;
lorcansmith 0:2a53a4c3238c 176 TCP_RMV(&tcp_bound_pcbs, pcb);
lorcansmith 0:2a53a4c3238c 177 memp_free(MEMP_TCP_PCB, pcb);
lorcansmith 0:2a53a4c3238c 178 pcb = NULL;
lorcansmith 0:2a53a4c3238c 179 break;
lorcansmith 0:2a53a4c3238c 180 case LISTEN:
lorcansmith 0:2a53a4c3238c 181 err = ERR_OK;
lorcansmith 0:2a53a4c3238c 182 tcp_pcb_remove(&tcp_listen_pcbs.pcbs, pcb);
lorcansmith 0:2a53a4c3238c 183 memp_free(MEMP_TCP_PCB_LISTEN, pcb);
lorcansmith 0:2a53a4c3238c 184 pcb = NULL;
lorcansmith 0:2a53a4c3238c 185 break;
lorcansmith 0:2a53a4c3238c 186 case SYN_SENT:
lorcansmith 0:2a53a4c3238c 187 err = ERR_OK;
lorcansmith 0:2a53a4c3238c 188 tcp_pcb_remove(&tcp_active_pcbs, pcb);
lorcansmith 0:2a53a4c3238c 189 memp_free(MEMP_TCP_PCB, pcb);
lorcansmith 0:2a53a4c3238c 190 pcb = NULL;
lorcansmith 0:2a53a4c3238c 191 snmp_inc_tcpattemptfails();
lorcansmith 0:2a53a4c3238c 192 break;
lorcansmith 0:2a53a4c3238c 193 case SYN_RCVD:
lorcansmith 0:2a53a4c3238c 194 err = tcp_send_fin(pcb);
lorcansmith 0:2a53a4c3238c 195 if (err == ERR_OK) {
lorcansmith 0:2a53a4c3238c 196 snmp_inc_tcpattemptfails();
lorcansmith 0:2a53a4c3238c 197 pcb->state = FIN_WAIT_1;
lorcansmith 0:2a53a4c3238c 198 }
lorcansmith 0:2a53a4c3238c 199 break;
lorcansmith 0:2a53a4c3238c 200 case ESTABLISHED:
lorcansmith 0:2a53a4c3238c 201 err = tcp_send_fin(pcb);
lorcansmith 0:2a53a4c3238c 202 if (err == ERR_OK) {
lorcansmith 0:2a53a4c3238c 203 snmp_inc_tcpestabresets();
lorcansmith 0:2a53a4c3238c 204 pcb->state = FIN_WAIT_1;
lorcansmith 0:2a53a4c3238c 205 }
lorcansmith 0:2a53a4c3238c 206 break;
lorcansmith 0:2a53a4c3238c 207 case CLOSE_WAIT:
lorcansmith 0:2a53a4c3238c 208 err = tcp_send_fin(pcb);
lorcansmith 0:2a53a4c3238c 209 if (err == ERR_OK) {
lorcansmith 0:2a53a4c3238c 210 snmp_inc_tcpestabresets();
lorcansmith 0:2a53a4c3238c 211 pcb->state = LAST_ACK;
lorcansmith 0:2a53a4c3238c 212 }
lorcansmith 0:2a53a4c3238c 213 break;
lorcansmith 0:2a53a4c3238c 214 default:
lorcansmith 0:2a53a4c3238c 215 /* Has already been closed, do nothing. */
lorcansmith 0:2a53a4c3238c 216 err = ERR_OK;
lorcansmith 0:2a53a4c3238c 217 pcb = NULL;
lorcansmith 0:2a53a4c3238c 218 break;
lorcansmith 0:2a53a4c3238c 219 }
lorcansmith 0:2a53a4c3238c 220
lorcansmith 0:2a53a4c3238c 221 if (pcb != NULL && err == ERR_OK) {
lorcansmith 0:2a53a4c3238c 222 /* To ensure all data has been sent when tcp_close returns, we have
lorcansmith 0:2a53a4c3238c 223 to make sure tcp_output doesn't fail.
lorcansmith 0:2a53a4c3238c 224 Since we don't really have to ensure all data has been sent when tcp_close
lorcansmith 0:2a53a4c3238c 225 returns (unsent data is sent from tcp timer functions, also), we don't care
lorcansmith 0:2a53a4c3238c 226 for the return value of tcp_output for now. */
lorcansmith 0:2a53a4c3238c 227 /* @todo: When implementing SO_LINGER, this must be changed somehow:
lorcansmith 0:2a53a4c3238c 228 If SOF_LINGER is set, the data should be sent and acked before close returns.
lorcansmith 0:2a53a4c3238c 229 This can only be valid for sequential APIs, not for the raw API. */
lorcansmith 0:2a53a4c3238c 230 tcp_output(pcb);
lorcansmith 0:2a53a4c3238c 231 }
lorcansmith 0:2a53a4c3238c 232 return err;
lorcansmith 0:2a53a4c3238c 233 }
lorcansmith 0:2a53a4c3238c 234
lorcansmith 0:2a53a4c3238c 235 /**
lorcansmith 0:2a53a4c3238c 236 * Closes the connection held by the PCB.
lorcansmith 0:2a53a4c3238c 237 *
lorcansmith 0:2a53a4c3238c 238 * Listening pcbs are freed and may not be referenced any more.
lorcansmith 0:2a53a4c3238c 239 * Connection pcbs are freed if not yet connected and may not be referenced
lorcansmith 0:2a53a4c3238c 240 * any more. If a connection is established (at least SYN received or in
lorcansmith 0:2a53a4c3238c 241 * a closing state), the connection is closed, and put in a closing state.
lorcansmith 0:2a53a4c3238c 242 * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
lorcansmith 0:2a53a4c3238c 243 * unsafe to reference it (unless an error is returned).
lorcansmith 0:2a53a4c3238c 244 *
lorcansmith 0:2a53a4c3238c 245 * @param pcb the tcp_pcb to close
lorcansmith 0:2a53a4c3238c 246 * @return ERR_OK if connection has been closed
lorcansmith 0:2a53a4c3238c 247 * another err_t if closing failed and pcb is not freed
lorcansmith 0:2a53a4c3238c 248 */
lorcansmith 0:2a53a4c3238c 249 err_t
lorcansmith 0:2a53a4c3238c 250 tcp_close(struct tcp_pcb *pcb)
lorcansmith 0:2a53a4c3238c 251 {
lorcansmith 0:2a53a4c3238c 252 #if TCP_DEBUG
lorcansmith 0:2a53a4c3238c 253 LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
lorcansmith 0:2a53a4c3238c 254 tcp_debug_print_state(pcb->state);
lorcansmith 0:2a53a4c3238c 255 #endif /* TCP_DEBUG */
lorcansmith 0:2a53a4c3238c 256
lorcansmith 0:2a53a4c3238c 257 if (pcb->state != LISTEN) {
lorcansmith 0:2a53a4c3238c 258 /* Set a flag not to receive any more data... */
lorcansmith 0:2a53a4c3238c 259 pcb->flags |= TF_RXCLOSED;
lorcansmith 0:2a53a4c3238c 260 }
lorcansmith 0:2a53a4c3238c 261 /* ... and close */
lorcansmith 0:2a53a4c3238c 262 return tcp_close_shutdown(pcb, 1);
lorcansmith 0:2a53a4c3238c 263 }
lorcansmith 0:2a53a4c3238c 264
lorcansmith 0:2a53a4c3238c 265 /**
lorcansmith 0:2a53a4c3238c 266 * Causes all or part of a full-duplex connection of this PCB to be shut down.
lorcansmith 0:2a53a4c3238c 267 * This doesn't deallocate the PCB!
lorcansmith 0:2a53a4c3238c 268 *
lorcansmith 0:2a53a4c3238c 269 * @param pcb PCB to shutdown
lorcansmith 0:2a53a4c3238c 270 * @param shut_rx shut down receive side if this is != 0
lorcansmith 0:2a53a4c3238c 271 * @param shut_tx shut down send side if this is != 0
lorcansmith 0:2a53a4c3238c 272 * @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
lorcansmith 0:2a53a4c3238c 273 * another err_t on error.
lorcansmith 0:2a53a4c3238c 274 */
lorcansmith 0:2a53a4c3238c 275 err_t
lorcansmith 0:2a53a4c3238c 276 tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
lorcansmith 0:2a53a4c3238c 277 {
lorcansmith 0:2a53a4c3238c 278 if (pcb->state == LISTEN) {
lorcansmith 0:2a53a4c3238c 279 return ERR_CONN;
lorcansmith 0:2a53a4c3238c 280 }
lorcansmith 0:2a53a4c3238c 281 if (shut_rx) {
lorcansmith 0:2a53a4c3238c 282 /* shut down the receive side: free buffered data... */
lorcansmith 0:2a53a4c3238c 283 if (pcb->refused_data != NULL) {
lorcansmith 0:2a53a4c3238c 284 pbuf_free(pcb->refused_data);
lorcansmith 0:2a53a4c3238c 285 pcb->refused_data = NULL;
lorcansmith 0:2a53a4c3238c 286 }
lorcansmith 0:2a53a4c3238c 287 /* ... and set a flag not to receive any more data */
lorcansmith 0:2a53a4c3238c 288 pcb->flags |= TF_RXCLOSED;
lorcansmith 0:2a53a4c3238c 289 }
lorcansmith 0:2a53a4c3238c 290 if (shut_tx) {
lorcansmith 0:2a53a4c3238c 291 /* This can't happen twice since if it succeeds, the pcb's state is changed.
lorcansmith 0:2a53a4c3238c 292 Only close in these states as the others directly deallocate the PCB */
lorcansmith 0:2a53a4c3238c 293 switch (pcb->state) {
lorcansmith 0:2a53a4c3238c 294 case SYN_RCVD:
lorcansmith 0:2a53a4c3238c 295 case ESTABLISHED:
lorcansmith 0:2a53a4c3238c 296 case CLOSE_WAIT:
lorcansmith 0:2a53a4c3238c 297 return tcp_close_shutdown(pcb, 0);
lorcansmith 0:2a53a4c3238c 298 default:
lorcansmith 0:2a53a4c3238c 299 /* don't shut down other states */
lorcansmith 0:2a53a4c3238c 300 break;
lorcansmith 0:2a53a4c3238c 301 }
lorcansmith 0:2a53a4c3238c 302 }
lorcansmith 0:2a53a4c3238c 303 /* @todo: return another err_t if not in correct state or already shut? */
lorcansmith 0:2a53a4c3238c 304 return ERR_OK;
lorcansmith 0:2a53a4c3238c 305 }
lorcansmith 0:2a53a4c3238c 306
lorcansmith 0:2a53a4c3238c 307 /**
lorcansmith 0:2a53a4c3238c 308 * Abandons a connection and optionally sends a RST to the remote
lorcansmith 0:2a53a4c3238c 309 * host. Deletes the local protocol control block. This is done when
lorcansmith 0:2a53a4c3238c 310 * a connection is killed because of shortage of memory.
lorcansmith 0:2a53a4c3238c 311 *
lorcansmith 0:2a53a4c3238c 312 * @param pcb the tcp_pcb to abort
lorcansmith 0:2a53a4c3238c 313 * @param reset boolean to indicate whether a reset should be sent
lorcansmith 0:2a53a4c3238c 314 */
lorcansmith 0:2a53a4c3238c 315 void
lorcansmith 0:2a53a4c3238c 316 tcp_abandon(struct tcp_pcb *pcb, int reset)
lorcansmith 0:2a53a4c3238c 317 {
lorcansmith 0:2a53a4c3238c 318 u32_t seqno, ackno;
lorcansmith 0:2a53a4c3238c 319 u16_t remote_port, local_port;
lorcansmith 0:2a53a4c3238c 320 ip_addr_t remote_ip, local_ip;
lorcansmith 0:2a53a4c3238c 321 #if LWIP_CALLBACK_API
lorcansmith 0:2a53a4c3238c 322 tcp_err_fn errf;
lorcansmith 0:2a53a4c3238c 323 #endif /* LWIP_CALLBACK_API */
lorcansmith 0:2a53a4c3238c 324 void *errf_arg;
lorcansmith 0:2a53a4c3238c 325
lorcansmith 0:2a53a4c3238c 326 /* pcb->state LISTEN not allowed here */
lorcansmith 0:2a53a4c3238c 327 LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
lorcansmith 0:2a53a4c3238c 328 pcb->state != LISTEN);
lorcansmith 0:2a53a4c3238c 329 /* Figure out on which TCP PCB list we are, and remove us. If we
lorcansmith 0:2a53a4c3238c 330 are in an active state, call the receive function associated with
lorcansmith 0:2a53a4c3238c 331 the PCB with a NULL argument, and send an RST to the remote end. */
lorcansmith 0:2a53a4c3238c 332 if (pcb->state == TIME_WAIT) {
lorcansmith 0:2a53a4c3238c 333 tcp_pcb_remove(&tcp_tw_pcbs, pcb);
lorcansmith 0:2a53a4c3238c 334 memp_free(MEMP_TCP_PCB, pcb);
lorcansmith 0:2a53a4c3238c 335 } else {
lorcansmith 0:2a53a4c3238c 336 seqno = pcb->snd_nxt;
lorcansmith 0:2a53a4c3238c 337 ackno = pcb->rcv_nxt;
lorcansmith 0:2a53a4c3238c 338 ip_addr_copy(local_ip, pcb->local_ip);
lorcansmith 0:2a53a4c3238c 339 ip_addr_copy(remote_ip, pcb->remote_ip);
lorcansmith 0:2a53a4c3238c 340 local_port = pcb->local_port;
lorcansmith 0:2a53a4c3238c 341 remote_port = pcb->remote_port;
lorcansmith 0:2a53a4c3238c 342 #if LWIP_CALLBACK_API
lorcansmith 0:2a53a4c3238c 343 errf = pcb->errf;
lorcansmith 0:2a53a4c3238c 344 #endif /* LWIP_CALLBACK_API */
lorcansmith 0:2a53a4c3238c 345 errf_arg = pcb->callback_arg;
lorcansmith 0:2a53a4c3238c 346 tcp_pcb_remove(&tcp_active_pcbs, pcb);
lorcansmith 0:2a53a4c3238c 347 if (pcb->unacked != NULL) {
lorcansmith 0:2a53a4c3238c 348 tcp_segs_free(pcb->unacked);
lorcansmith 0:2a53a4c3238c 349 }
lorcansmith 0:2a53a4c3238c 350 if (pcb->unsent != NULL) {
lorcansmith 0:2a53a4c3238c 351 tcp_segs_free(pcb->unsent);
lorcansmith 0:2a53a4c3238c 352 }
lorcansmith 0:2a53a4c3238c 353 #if TCP_QUEUE_OOSEQ
lorcansmith 0:2a53a4c3238c 354 if (pcb->ooseq != NULL) {
lorcansmith 0:2a53a4c3238c 355 tcp_segs_free(pcb->ooseq);
lorcansmith 0:2a53a4c3238c 356 }
lorcansmith 0:2a53a4c3238c 357 #endif /* TCP_QUEUE_OOSEQ */
lorcansmith 0:2a53a4c3238c 358 memp_free(MEMP_TCP_PCB, pcb);
lorcansmith 0:2a53a4c3238c 359 TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
lorcansmith 0:2a53a4c3238c 360 if (reset) {
lorcansmith 0:2a53a4c3238c 361 LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
lorcansmith 0:2a53a4c3238c 362 tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port);
lorcansmith 0:2a53a4c3238c 363 }
lorcansmith 0:2a53a4c3238c 364 }
lorcansmith 0:2a53a4c3238c 365 }
lorcansmith 0:2a53a4c3238c 366
lorcansmith 0:2a53a4c3238c 367 /**
lorcansmith 0:2a53a4c3238c 368 * Aborts the connection by sending a RST (reset) segment to the remote
lorcansmith 0:2a53a4c3238c 369 * host. The pcb is deallocated. This function never fails.
lorcansmith 0:2a53a4c3238c 370 *
lorcansmith 0:2a53a4c3238c 371 * ATTENTION: When calling this from one of the TCP callbacks, make
lorcansmith 0:2a53a4c3238c 372 * sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
lorcansmith 0:2a53a4c3238c 373 * or you will risk accessing deallocated memory or memory leaks!
lorcansmith 0:2a53a4c3238c 374 *
lorcansmith 0:2a53a4c3238c 375 * @param pcb the tcp pcb to abort
lorcansmith 0:2a53a4c3238c 376 */
lorcansmith 0:2a53a4c3238c 377 void
lorcansmith 0:2a53a4c3238c 378 tcp_abort(struct tcp_pcb *pcb)
lorcansmith 0:2a53a4c3238c 379 {
lorcansmith 0:2a53a4c3238c 380 tcp_abandon(pcb, 1);
lorcansmith 0:2a53a4c3238c 381 }
lorcansmith 0:2a53a4c3238c 382
lorcansmith 0:2a53a4c3238c 383 /**
lorcansmith 0:2a53a4c3238c 384 * Binds the connection to a local portnumber and IP address. If the
lorcansmith 0:2a53a4c3238c 385 * IP address is not given (i.e., ipaddr == NULL), the IP address of
lorcansmith 0:2a53a4c3238c 386 * the outgoing network interface is used instead.
lorcansmith 0:2a53a4c3238c 387 *
lorcansmith 0:2a53a4c3238c 388 * @param pcb the tcp_pcb to bind (no check is done whether this pcb is
lorcansmith 0:2a53a4c3238c 389 * already bound!)
lorcansmith 0:2a53a4c3238c 390 * @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
lorcansmith 0:2a53a4c3238c 391 * to any local address
lorcansmith 0:2a53a4c3238c 392 * @param port the local port to bind to
lorcansmith 0:2a53a4c3238c 393 * @return ERR_USE if the port is already in use
lorcansmith 0:2a53a4c3238c 394 * ERR_OK if bound
lorcansmith 0:2a53a4c3238c 395 */
lorcansmith 0:2a53a4c3238c 396 err_t
lorcansmith 0:2a53a4c3238c 397 tcp_bind(struct tcp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
lorcansmith 0:2a53a4c3238c 398 {
lorcansmith 0:2a53a4c3238c 399 int i;
lorcansmith 0:2a53a4c3238c 400 int max_pcb_list = NUM_TCP_PCB_LISTS;
lorcansmith 0:2a53a4c3238c 401 struct tcp_pcb *cpcb;
lorcansmith 0:2a53a4c3238c 402
lorcansmith 0:2a53a4c3238c 403 LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
lorcansmith 0:2a53a4c3238c 404
lorcansmith 0:2a53a4c3238c 405 #if SO_REUSE
lorcansmith 0:2a53a4c3238c 406 /* Unless the REUSEADDR flag is set,
lorcansmith 0:2a53a4c3238c 407 we have to check the pcbs in TIME-WAIT state, also.
lorcansmith 0:2a53a4c3238c 408 We do not dump TIME_WAIT pcb's; they can still be matched by incoming
lorcansmith 0:2a53a4c3238c 409 packets using both local and remote IP addresses and ports to distinguish.
lorcansmith 0:2a53a4c3238c 410 */
lorcansmith 0:2a53a4c3238c 411 #if SO_REUSE
lorcansmith 0:2a53a4c3238c 412 if ((pcb->so_options & SOF_REUSEADDR) != 0) {
lorcansmith 0:2a53a4c3238c 413 max_pcb_list = NUM_TCP_PCB_LISTS_NO_TIME_WAIT;
lorcansmith 0:2a53a4c3238c 414 }
lorcansmith 0:2a53a4c3238c 415 #endif /* SO_REUSE */
lorcansmith 0:2a53a4c3238c 416 #endif /* SO_REUSE */
lorcansmith 0:2a53a4c3238c 417
lorcansmith 0:2a53a4c3238c 418 if (port == 0) {
lorcansmith 0:2a53a4c3238c 419 port = tcp_new_port();
lorcansmith 0:2a53a4c3238c 420 }
lorcansmith 0:2a53a4c3238c 421
lorcansmith 0:2a53a4c3238c 422 /* Check if the address already is in use (on all lists) */
lorcansmith 0:2a53a4c3238c 423 for (i = 0; i < max_pcb_list; i++) {
lorcansmith 0:2a53a4c3238c 424 for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
lorcansmith 0:2a53a4c3238c 425 if (cpcb->local_port == port) {
lorcansmith 0:2a53a4c3238c 426 #if SO_REUSE
lorcansmith 0:2a53a4c3238c 427 /* Omit checking for the same port if both pcbs have REUSEADDR set.
lorcansmith 0:2a53a4c3238c 428 For SO_REUSEADDR, the duplicate-check for a 5-tuple is done in
lorcansmith 0:2a53a4c3238c 429 tcp_connect. */
lorcansmith 0:2a53a4c3238c 430 if (((pcb->so_options & SOF_REUSEADDR) == 0) ||
lorcansmith 0:2a53a4c3238c 431 ((cpcb->so_options & SOF_REUSEADDR) == 0))
lorcansmith 0:2a53a4c3238c 432 #endif /* SO_REUSE */
lorcansmith 0:2a53a4c3238c 433 {
lorcansmith 0:2a53a4c3238c 434 if (ip_addr_isany(&(cpcb->local_ip)) ||
lorcansmith 0:2a53a4c3238c 435 ip_addr_isany(ipaddr) ||
lorcansmith 0:2a53a4c3238c 436 ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
lorcansmith 0:2a53a4c3238c 437 return ERR_USE;
lorcansmith 0:2a53a4c3238c 438 }
lorcansmith 0:2a53a4c3238c 439 }
lorcansmith 0:2a53a4c3238c 440 }
lorcansmith 0:2a53a4c3238c 441 }
lorcansmith 0:2a53a4c3238c 442 }
lorcansmith 0:2a53a4c3238c 443
lorcansmith 0:2a53a4c3238c 444 if (!ip_addr_isany(ipaddr)) {
lorcansmith 0:2a53a4c3238c 445 pcb->local_ip = *ipaddr;
lorcansmith 0:2a53a4c3238c 446 }
lorcansmith 0:2a53a4c3238c 447 pcb->local_port = port;
lorcansmith 0:2a53a4c3238c 448 TCP_REG(&tcp_bound_pcbs, pcb);
lorcansmith 0:2a53a4c3238c 449 LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
lorcansmith 0:2a53a4c3238c 450 return ERR_OK;
lorcansmith 0:2a53a4c3238c 451 }
lorcansmith 0:2a53a4c3238c 452 #if LWIP_CALLBACK_API
lorcansmith 0:2a53a4c3238c 453 /**
lorcansmith 0:2a53a4c3238c 454 * Default accept callback if no accept callback is specified by the user.
lorcansmith 0:2a53a4c3238c 455 */
lorcansmith 0:2a53a4c3238c 456 static err_t
lorcansmith 0:2a53a4c3238c 457 tcp_accept_null(void *arg, struct tcp_pcb *pcb, err_t err)
lorcansmith 0:2a53a4c3238c 458 {
lorcansmith 0:2a53a4c3238c 459 LWIP_UNUSED_ARG(arg);
lorcansmith 0:2a53a4c3238c 460 LWIP_UNUSED_ARG(pcb);
lorcansmith 0:2a53a4c3238c 461 LWIP_UNUSED_ARG(err);
lorcansmith 0:2a53a4c3238c 462
lorcansmith 0:2a53a4c3238c 463 return ERR_ABRT;
lorcansmith 0:2a53a4c3238c 464 }
lorcansmith 0:2a53a4c3238c 465 #endif /* LWIP_CALLBACK_API */
lorcansmith 0:2a53a4c3238c 466
lorcansmith 0:2a53a4c3238c 467 /**
lorcansmith 0:2a53a4c3238c 468 * Set the state of the connection to be LISTEN, which means that it
lorcansmith 0:2a53a4c3238c 469 * is able to accept incoming connections. The protocol control block
lorcansmith 0:2a53a4c3238c 470 * is reallocated in order to consume less memory. Setting the
lorcansmith 0:2a53a4c3238c 471 * connection to LISTEN is an irreversible process.
lorcansmith 0:2a53a4c3238c 472 *
lorcansmith 0:2a53a4c3238c 473 * @param pcb the original tcp_pcb
lorcansmith 0:2a53a4c3238c 474 * @param backlog the incoming connections queue limit
lorcansmith 0:2a53a4c3238c 475 * @return tcp_pcb used for listening, consumes less memory.
lorcansmith 0:2a53a4c3238c 476 *
lorcansmith 0:2a53a4c3238c 477 * @note The original tcp_pcb is freed. This function therefore has to be
lorcansmith 0:2a53a4c3238c 478 * called like this:
lorcansmith 0:2a53a4c3238c 479 * tpcb = tcp_listen(tpcb);
lorcansmith 0:2a53a4c3238c 480 */
lorcansmith 0:2a53a4c3238c 481 struct tcp_pcb *
lorcansmith 0:2a53a4c3238c 482 tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
lorcansmith 0:2a53a4c3238c 483 {
lorcansmith 0:2a53a4c3238c 484 struct tcp_pcb_listen *lpcb;
lorcansmith 0:2a53a4c3238c 485
lorcansmith 0:2a53a4c3238c 486 LWIP_UNUSED_ARG(backlog);
lorcansmith 0:2a53a4c3238c 487 LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL);
lorcansmith 0:2a53a4c3238c 488
lorcansmith 0:2a53a4c3238c 489 /* already listening? */
lorcansmith 0:2a53a4c3238c 490 if (pcb->state == LISTEN) {
lorcansmith 0:2a53a4c3238c 491 return pcb;
lorcansmith 0:2a53a4c3238c 492 }
lorcansmith 0:2a53a4c3238c 493 #if SO_REUSE
lorcansmith 0:2a53a4c3238c 494 if ((pcb->so_options & SOF_REUSEADDR) != 0) {
lorcansmith 0:2a53a4c3238c 495 /* Since SOF_REUSEADDR allows reusing a local address before the pcb's usage
lorcansmith 0:2a53a4c3238c 496 is declared (listen-/connection-pcb), we have to make sure now that
lorcansmith 0:2a53a4c3238c 497 this port is only used once for every local IP. */
lorcansmith 0:2a53a4c3238c 498 for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
lorcansmith 0:2a53a4c3238c 499 if (lpcb->local_port == pcb->local_port) {
lorcansmith 0:2a53a4c3238c 500 if (ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
lorcansmith 0:2a53a4c3238c 501 /* this address/port is already used */
lorcansmith 0:2a53a4c3238c 502 return NULL;
lorcansmith 0:2a53a4c3238c 503 }
lorcansmith 0:2a53a4c3238c 504 }
lorcansmith 0:2a53a4c3238c 505 }
lorcansmith 0:2a53a4c3238c 506 }
lorcansmith 0:2a53a4c3238c 507 #endif /* SO_REUSE */
lorcansmith 0:2a53a4c3238c 508 lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
lorcansmith 0:2a53a4c3238c 509 if (lpcb == NULL) {
lorcansmith 0:2a53a4c3238c 510 return NULL;
lorcansmith 0:2a53a4c3238c 511 }
lorcansmith 0:2a53a4c3238c 512 lpcb->callback_arg = pcb->callback_arg;
lorcansmith 0:2a53a4c3238c 513 lpcb->local_port = pcb->local_port;
lorcansmith 0:2a53a4c3238c 514 lpcb->state = LISTEN;
lorcansmith 0:2a53a4c3238c 515 lpcb->prio = pcb->prio;
lorcansmith 0:2a53a4c3238c 516 lpcb->so_options = pcb->so_options;
lorcansmith 0:2a53a4c3238c 517 lpcb->so_options |= SOF_ACCEPTCONN;
lorcansmith 0:2a53a4c3238c 518 lpcb->ttl = pcb->ttl;
lorcansmith 0:2a53a4c3238c 519 lpcb->tos = pcb->tos;
lorcansmith 0:2a53a4c3238c 520 ip_addr_copy(lpcb->local_ip, pcb->local_ip);
lorcansmith 0:2a53a4c3238c 521 TCP_RMV(&tcp_bound_pcbs, pcb);
lorcansmith 0:2a53a4c3238c 522 memp_free(MEMP_TCP_PCB, pcb);
lorcansmith 0:2a53a4c3238c 523 #if LWIP_CALLBACK_API
lorcansmith 0:2a53a4c3238c 524 lpcb->accept = tcp_accept_null;
lorcansmith 0:2a53a4c3238c 525 #endif /* LWIP_CALLBACK_API */
lorcansmith 0:2a53a4c3238c 526 #if TCP_LISTEN_BACKLOG
lorcansmith 0:2a53a4c3238c 527 lpcb->accepts_pending = 0;
lorcansmith 0:2a53a4c3238c 528 lpcb->backlog = (backlog ? backlog : 1);
lorcansmith 0:2a53a4c3238c 529 #endif /* TCP_LISTEN_BACKLOG */
lorcansmith 0:2a53a4c3238c 530 TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
lorcansmith 0:2a53a4c3238c 531 return (struct tcp_pcb *)lpcb;
lorcansmith 0:2a53a4c3238c 532 }
lorcansmith 0:2a53a4c3238c 533
lorcansmith 0:2a53a4c3238c 534 /**
lorcansmith 0:2a53a4c3238c 535 * Update the state that tracks the available window space to advertise.
lorcansmith 0:2a53a4c3238c 536 *
lorcansmith 0:2a53a4c3238c 537 * Returns how much extra window would be advertised if we sent an
lorcansmith 0:2a53a4c3238c 538 * update now.
lorcansmith 0:2a53a4c3238c 539 */
lorcansmith 0:2a53a4c3238c 540 u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
lorcansmith 0:2a53a4c3238c 541 {
lorcansmith 0:2a53a4c3238c 542 u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
lorcansmith 0:2a53a4c3238c 543
lorcansmith 0:2a53a4c3238c 544 if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) {
lorcansmith 0:2a53a4c3238c 545 /* we can advertise more window */
lorcansmith 0:2a53a4c3238c 546 pcb->rcv_ann_wnd = pcb->rcv_wnd;
lorcansmith 0:2a53a4c3238c 547 return new_right_edge - pcb->rcv_ann_right_edge;
lorcansmith 0:2a53a4c3238c 548 } else {
lorcansmith 0:2a53a4c3238c 549 if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
lorcansmith 0:2a53a4c3238c 550 /* Can happen due to other end sending out of advertised window,
lorcansmith 0:2a53a4c3238c 551 * but within actual available (but not yet advertised) window */
lorcansmith 0:2a53a4c3238c 552 pcb->rcv_ann_wnd = 0;
lorcansmith 0:2a53a4c3238c 553 } else {
lorcansmith 0:2a53a4c3238c 554 /* keep the right edge of window constant */
lorcansmith 0:2a53a4c3238c 555 u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
lorcansmith 0:2a53a4c3238c 556 LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff", new_rcv_ann_wnd <= 0xffff);
lorcansmith 0:2a53a4c3238c 557 pcb->rcv_ann_wnd = (u16_t)new_rcv_ann_wnd;
lorcansmith 0:2a53a4c3238c 558 }
lorcansmith 0:2a53a4c3238c 559 return 0;
lorcansmith 0:2a53a4c3238c 560 }
lorcansmith 0:2a53a4c3238c 561 }
lorcansmith 0:2a53a4c3238c 562
lorcansmith 0:2a53a4c3238c 563 /**
lorcansmith 0:2a53a4c3238c 564 * This function should be called by the application when it has
lorcansmith 0:2a53a4c3238c 565 * processed the data. The purpose is to advertise a larger window
lorcansmith 0:2a53a4c3238c 566 * when the data has been processed.
lorcansmith 0:2a53a4c3238c 567 *
lorcansmith 0:2a53a4c3238c 568 * @param pcb the tcp_pcb for which data is read
lorcansmith 0:2a53a4c3238c 569 * @param len the amount of bytes that have been read by the application
lorcansmith 0:2a53a4c3238c 570 */
lorcansmith 0:2a53a4c3238c 571 void
lorcansmith 0:2a53a4c3238c 572 tcp_recved(struct tcp_pcb *pcb, u16_t len)
lorcansmith 0:2a53a4c3238c 573 {
lorcansmith 0:2a53a4c3238c 574 int wnd_inflation;
lorcansmith 0:2a53a4c3238c 575
lorcansmith 0:2a53a4c3238c 576 LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
lorcansmith 0:2a53a4c3238c 577 len <= 0xffff - pcb->rcv_wnd );
lorcansmith 0:2a53a4c3238c 578
lorcansmith 0:2a53a4c3238c 579 pcb->rcv_wnd += len;
lorcansmith 0:2a53a4c3238c 580 if (pcb->rcv_wnd > TCP_WND) {
lorcansmith 0:2a53a4c3238c 581 pcb->rcv_wnd = TCP_WND;
lorcansmith 0:2a53a4c3238c 582 }
lorcansmith 0:2a53a4c3238c 583
lorcansmith 0:2a53a4c3238c 584 wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
lorcansmith 0:2a53a4c3238c 585
lorcansmith 0:2a53a4c3238c 586 /* If the change in the right edge of window is significant (default
lorcansmith 0:2a53a4c3238c 587 * watermark is TCP_WND/4), then send an explicit update now.
lorcansmith 0:2a53a4c3238c 588 * Otherwise wait for a packet to be sent in the normal course of
lorcansmith 0:2a53a4c3238c 589 * events (or more window to be available later) */
lorcansmith 0:2a53a4c3238c 590 if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
lorcansmith 0:2a53a4c3238c 591 tcp_ack_now(pcb);
lorcansmith 0:2a53a4c3238c 592 tcp_output(pcb);
lorcansmith 0:2a53a4c3238c 593 }
lorcansmith 0:2a53a4c3238c 594
lorcansmith 0:2a53a4c3238c 595 LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
lorcansmith 0:2a53a4c3238c 596 len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
lorcansmith 0:2a53a4c3238c 597 }
lorcansmith 0:2a53a4c3238c 598
lorcansmith 0:2a53a4c3238c 599 /**
lorcansmith 0:2a53a4c3238c 600 * A nastly hack featuring 'goto' statements that allocates a
lorcansmith 0:2a53a4c3238c 601 * new TCP local port.
lorcansmith 0:2a53a4c3238c 602 *
lorcansmith 0:2a53a4c3238c 603 * @return a new (free) local TCP port number
lorcansmith 0:2a53a4c3238c 604 */
lorcansmith 0:2a53a4c3238c 605 static u16_t
lorcansmith 0:2a53a4c3238c 606 tcp_new_port(void)
lorcansmith 0:2a53a4c3238c 607 {
lorcansmith 0:2a53a4c3238c 608 int i;
lorcansmith 0:2a53a4c3238c 609 struct tcp_pcb *pcb;
lorcansmith 0:2a53a4c3238c 610 #ifndef TCP_LOCAL_PORT_RANGE_START
lorcansmith 0:2a53a4c3238c 611 #define TCP_LOCAL_PORT_RANGE_START 4096
lorcansmith 0:2a53a4c3238c 612 #define TCP_LOCAL_PORT_RANGE_END 0x7fff
lorcansmith 0:2a53a4c3238c 613 #endif
lorcansmith 0:2a53a4c3238c 614 static u16_t port = TCP_LOCAL_PORT_RANGE_START;
lorcansmith 0:2a53a4c3238c 615
lorcansmith 0:2a53a4c3238c 616 again:
lorcansmith 0:2a53a4c3238c 617 if (++port > TCP_LOCAL_PORT_RANGE_END) {
lorcansmith 0:2a53a4c3238c 618 port = TCP_LOCAL_PORT_RANGE_START;
lorcansmith 0:2a53a4c3238c 619 }
lorcansmith 0:2a53a4c3238c 620 /* Check all PCB lists. */
lorcansmith 0:2a53a4c3238c 621 for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
lorcansmith 0:2a53a4c3238c 622 for(pcb = *tcp_pcb_lists[i]; pcb != NULL; pcb = pcb->next) {
lorcansmith 0:2a53a4c3238c 623 if (pcb->local_port == port) {
lorcansmith 0:2a53a4c3238c 624 goto again;
lorcansmith 0:2a53a4c3238c 625 }
lorcansmith 0:2a53a4c3238c 626 }
lorcansmith 0:2a53a4c3238c 627 }
lorcansmith 0:2a53a4c3238c 628 return port;
lorcansmith 0:2a53a4c3238c 629 }
lorcansmith 0:2a53a4c3238c 630
lorcansmith 0:2a53a4c3238c 631 /**
lorcansmith 0:2a53a4c3238c 632 * Connects to another host. The function given as the "connected"
lorcansmith 0:2a53a4c3238c 633 * argument will be called when the connection has been established.
lorcansmith 0:2a53a4c3238c 634 *
lorcansmith 0:2a53a4c3238c 635 * @param pcb the tcp_pcb used to establish the connection
lorcansmith 0:2a53a4c3238c 636 * @param ipaddr the remote ip address to connect to
lorcansmith 0:2a53a4c3238c 637 * @param port the remote tcp port to connect to
lorcansmith 0:2a53a4c3238c 638 * @param connected callback function to call when connected (or on error)
lorcansmith 0:2a53a4c3238c 639 * @return ERR_VAL if invalid arguments are given
lorcansmith 0:2a53a4c3238c 640 * ERR_OK if connect request has been sent
lorcansmith 0:2a53a4c3238c 641 * other err_t values if connect request couldn't be sent
lorcansmith 0:2a53a4c3238c 642 */
lorcansmith 0:2a53a4c3238c 643 err_t
lorcansmith 0:2a53a4c3238c 644 tcp_connect(struct tcp_pcb *pcb, ip_addr_t *ipaddr, u16_t port,
lorcansmith 0:2a53a4c3238c 645 tcp_connected_fn connected)
lorcansmith 0:2a53a4c3238c 646 {
lorcansmith 0:2a53a4c3238c 647 err_t ret;
lorcansmith 0:2a53a4c3238c 648 u32_t iss;
lorcansmith 0:2a53a4c3238c 649
lorcansmith 0:2a53a4c3238c 650 LWIP_ERROR("tcp_connect: can only connected from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
lorcansmith 0:2a53a4c3238c 651
lorcansmith 0:2a53a4c3238c 652 LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
lorcansmith 0:2a53a4c3238c 653 if (ipaddr != NULL) {
lorcansmith 0:2a53a4c3238c 654 pcb->remote_ip = *ipaddr;
lorcansmith 0:2a53a4c3238c 655 } else {
lorcansmith 0:2a53a4c3238c 656 return ERR_VAL;
lorcansmith 0:2a53a4c3238c 657 }
lorcansmith 0:2a53a4c3238c 658 pcb->remote_port = port;
lorcansmith 0:2a53a4c3238c 659
lorcansmith 0:2a53a4c3238c 660 /* check if we have a route to the remote host */
lorcansmith 0:2a53a4c3238c 661 if (ip_addr_isany(&(pcb->local_ip))) {
lorcansmith 0:2a53a4c3238c 662 /* no local IP address set, yet. */
lorcansmith 0:2a53a4c3238c 663 struct netif *netif = ip_route(&(pcb->remote_ip));
lorcansmith 0:2a53a4c3238c 664 if (netif == NULL) {
lorcansmith 0:2a53a4c3238c 665 /* Don't even try to send a SYN packet if we have no route
lorcansmith 0:2a53a4c3238c 666 since that will fail. */
lorcansmith 0:2a53a4c3238c 667 return ERR_RTE;
lorcansmith 0:2a53a4c3238c 668 }
lorcansmith 0:2a53a4c3238c 669 /* Use the netif's IP address as local address. */
lorcansmith 0:2a53a4c3238c 670 ip_addr_copy(pcb->local_ip, netif->ip_addr);
lorcansmith 0:2a53a4c3238c 671 }
lorcansmith 0:2a53a4c3238c 672
lorcansmith 0:2a53a4c3238c 673 if (pcb->local_port == 0) {
lorcansmith 0:2a53a4c3238c 674 pcb->local_port = tcp_new_port();
lorcansmith 0:2a53a4c3238c 675 }
lorcansmith 0:2a53a4c3238c 676 #if SO_REUSE
lorcansmith 0:2a53a4c3238c 677 if ((pcb->so_options & SOF_REUSEADDR) != 0) {
lorcansmith 0:2a53a4c3238c 678 /* Since SOF_REUSEADDR allows reusing a local address, we have to make sure
lorcansmith 0:2a53a4c3238c 679 now that the 5-tuple is unique. */
lorcansmith 0:2a53a4c3238c 680 struct tcp_pcb *cpcb;
lorcansmith 0:2a53a4c3238c 681 int i;
lorcansmith 0:2a53a4c3238c 682 /* Don't check listen PCBs, check bound-, active- and TIME-WAIT PCBs. */
lorcansmith 0:2a53a4c3238c 683 for (i = 1; i < NUM_TCP_PCB_LISTS; i++) {
lorcansmith 0:2a53a4c3238c 684 for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
lorcansmith 0:2a53a4c3238c 685 if ((cpcb->local_port == pcb->local_port) &&
lorcansmith 0:2a53a4c3238c 686 (cpcb->remote_port == port) &&
lorcansmith 0:2a53a4c3238c 687 ip_addr_cmp(&cpcb->local_ip, &pcb->local_ip) &&
lorcansmith 0:2a53a4c3238c 688 ip_addr_cmp(&cpcb->remote_ip, ipaddr)) {
lorcansmith 0:2a53a4c3238c 689 /* linux returns EISCONN here, but ERR_USE should be OK for us */
lorcansmith 0:2a53a4c3238c 690 return ERR_USE;
lorcansmith 0:2a53a4c3238c 691 }
lorcansmith 0:2a53a4c3238c 692 }
lorcansmith 0:2a53a4c3238c 693 }
lorcansmith 0:2a53a4c3238c 694 }
lorcansmith 0:2a53a4c3238c 695 #endif /* SO_REUSE */
lorcansmith 0:2a53a4c3238c 696 iss = tcp_next_iss();
lorcansmith 0:2a53a4c3238c 697 pcb->rcv_nxt = 0;
lorcansmith 0:2a53a4c3238c 698 pcb->snd_nxt = iss;
lorcansmith 0:2a53a4c3238c 699 pcb->lastack = iss - 1;
lorcansmith 0:2a53a4c3238c 700 pcb->snd_lbb = iss - 1;
lorcansmith 0:2a53a4c3238c 701 pcb->rcv_wnd = TCP_WND;
lorcansmith 0:2a53a4c3238c 702 pcb->rcv_ann_wnd = TCP_WND;
lorcansmith 0:2a53a4c3238c 703 pcb->rcv_ann_right_edge = pcb->rcv_nxt;
lorcansmith 0:2a53a4c3238c 704 pcb->snd_wnd = TCP_WND;
lorcansmith 0:2a53a4c3238c 705 /* As initial send MSS, we use TCP_MSS but limit it to 536.
lorcansmith 0:2a53a4c3238c 706 The send MSS is updated when an MSS option is received. */
lorcansmith 0:2a53a4c3238c 707 pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
lorcansmith 0:2a53a4c3238c 708 #if TCP_CALCULATE_EFF_SEND_MSS
lorcansmith 0:2a53a4c3238c 709 pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr);
lorcansmith 0:2a53a4c3238c 710 #endif /* TCP_CALCULATE_EFF_SEND_MSS */
lorcansmith 0:2a53a4c3238c 711 pcb->cwnd = 1;
lorcansmith 0:2a53a4c3238c 712 pcb->ssthresh = pcb->mss * 10;
lorcansmith 0:2a53a4c3238c 713 #if LWIP_CALLBACK_API
lorcansmith 0:2a53a4c3238c 714 pcb->connected = connected;
lorcansmith 0:2a53a4c3238c 715 #else /* LWIP_CALLBACK_API */
lorcansmith 0:2a53a4c3238c 716 LWIP_UNUSED_ARG(connected);
lorcansmith 0:2a53a4c3238c 717 #endif /* LWIP_CALLBACK_API */
lorcansmith 0:2a53a4c3238c 718
lorcansmith 0:2a53a4c3238c 719 LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
lorcansmith 0:2a53a4c3238c 720
lorcansmith 0:2a53a4c3238c 721 /* Send a SYN together with the MSS option. */
lorcansmith 0:2a53a4c3238c 722 ret = tcp_enqueue_flags(pcb, TCP_SYN);
lorcansmith 0:2a53a4c3238c 723 if (ret == ERR_OK) {
lorcansmith 0:2a53a4c3238c 724 /* SYN segment was enqueued, changed the pcbs state now */
lorcansmith 0:2a53a4c3238c 725 pcb->state = SYN_SENT;
lorcansmith 0:2a53a4c3238c 726 TCP_RMV(&tcp_bound_pcbs, pcb);
lorcansmith 0:2a53a4c3238c 727 TCP_REG(&tcp_active_pcbs, pcb);
lorcansmith 0:2a53a4c3238c 728 snmp_inc_tcpactiveopens();
lorcansmith 0:2a53a4c3238c 729
lorcansmith 0:2a53a4c3238c 730 tcp_output(pcb);
lorcansmith 0:2a53a4c3238c 731 }
lorcansmith 0:2a53a4c3238c 732 return ret;
lorcansmith 0:2a53a4c3238c 733 }
lorcansmith 0:2a53a4c3238c 734
lorcansmith 0:2a53a4c3238c 735 /**
lorcansmith 0:2a53a4c3238c 736 * Called every 500 ms and implements the retransmission timer and the timer that
lorcansmith 0:2a53a4c3238c 737 * removes PCBs that have been in TIME-WAIT for enough time. It also increments
lorcansmith 0:2a53a4c3238c 738 * various timers such as the inactivity timer in each PCB.
lorcansmith 0:2a53a4c3238c 739 *
lorcansmith 0:2a53a4c3238c 740 * Automatically called from tcp_tmr().
lorcansmith 0:2a53a4c3238c 741 */
lorcansmith 0:2a53a4c3238c 742 void
lorcansmith 0:2a53a4c3238c 743 tcp_slowtmr(void)
lorcansmith 0:2a53a4c3238c 744 {
lorcansmith 0:2a53a4c3238c 745 struct tcp_pcb *pcb, *pcb2, *prev;
lorcansmith 0:2a53a4c3238c 746 u16_t eff_wnd;
lorcansmith 0:2a53a4c3238c 747 u8_t pcb_remove; /* flag if a PCB should be removed */
lorcansmith 0:2a53a4c3238c 748 u8_t pcb_reset; /* flag if a RST should be sent when removing */
lorcansmith 0:2a53a4c3238c 749 err_t err;
lorcansmith 0:2a53a4c3238c 750
lorcansmith 0:2a53a4c3238c 751 tcp_debug_print_pcbs(); //DG
lorcansmith 0:2a53a4c3238c 752
lorcansmith 0:2a53a4c3238c 753 err = ERR_OK;
lorcansmith 0:2a53a4c3238c 754
lorcansmith 0:2a53a4c3238c 755 ++tcp_ticks;
lorcansmith 0:2a53a4c3238c 756 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: tcp_ticks=%"U32_F"\n", tcp_ticks));
lorcansmith 0:2a53a4c3238c 757
lorcansmith 0:2a53a4c3238c 758 /* Steps through all of the active PCBs. */
lorcansmith 0:2a53a4c3238c 759 prev = NULL;
lorcansmith 0:2a53a4c3238c 760 pcb = tcp_active_pcbs;
lorcansmith 0:2a53a4c3238c 761 if (pcb == NULL) {
lorcansmith 0:2a53a4c3238c 762 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
lorcansmith 0:2a53a4c3238c 763 }
lorcansmith 0:2a53a4c3238c 764 while (pcb != NULL) {
lorcansmith 0:2a53a4c3238c 765 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
lorcansmith 0:2a53a4c3238c 766 LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
lorcansmith 0:2a53a4c3238c 767 LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
lorcansmith 0:2a53a4c3238c 768 LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
lorcansmith 0:2a53a4c3238c 769
lorcansmith 0:2a53a4c3238c 770 pcb_remove = 0;
lorcansmith 0:2a53a4c3238c 771 pcb_reset = 0;
lorcansmith 0:2a53a4c3238c 772
lorcansmith 0:2a53a4c3238c 773 if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
lorcansmith 0:2a53a4c3238c 774 ++pcb_remove;
lorcansmith 0:2a53a4c3238c 775 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
lorcansmith 0:2a53a4c3238c 776 }
lorcansmith 0:2a53a4c3238c 777 else if (pcb->nrtx == TCP_MAXRTX) {
lorcansmith 0:2a53a4c3238c 778 ++pcb_remove;
lorcansmith 0:2a53a4c3238c 779 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
lorcansmith 0:2a53a4c3238c 780 } else {
lorcansmith 0:2a53a4c3238c 781 if (pcb->persist_backoff > 0) {
lorcansmith 0:2a53a4c3238c 782 /* If snd_wnd is zero, use persist timer to send 1 byte probes
lorcansmith 0:2a53a4c3238c 783 * instead of using the standard retransmission mechanism. */
lorcansmith 0:2a53a4c3238c 784 pcb->persist_cnt++;
lorcansmith 0:2a53a4c3238c 785 if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) {
lorcansmith 0:2a53a4c3238c 786 pcb->persist_cnt = 0;
lorcansmith 0:2a53a4c3238c 787 if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
lorcansmith 0:2a53a4c3238c 788 pcb->persist_backoff++;
lorcansmith 0:2a53a4c3238c 789 }
lorcansmith 0:2a53a4c3238c 790 tcp_zero_window_probe(pcb);
lorcansmith 0:2a53a4c3238c 791 }
lorcansmith 0:2a53a4c3238c 792 } else {
lorcansmith 0:2a53a4c3238c 793 /* Increase the retransmission timer if it is running */
lorcansmith 0:2a53a4c3238c 794 if(pcb->rtime >= 0)
lorcansmith 0:2a53a4c3238c 795 ++pcb->rtime;
lorcansmith 0:2a53a4c3238c 796
lorcansmith 0:2a53a4c3238c 797 if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
lorcansmith 0:2a53a4c3238c 798 /* Time for a retransmission. */
lorcansmith 0:2a53a4c3238c 799 LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
lorcansmith 0:2a53a4c3238c 800 " pcb->rto %"S16_F"\n",
lorcansmith 0:2a53a4c3238c 801 pcb->rtime, pcb->rto));
lorcansmith 0:2a53a4c3238c 802
lorcansmith 0:2a53a4c3238c 803 /* Double retransmission time-out unless we are trying to
lorcansmith 0:2a53a4c3238c 804 * connect to somebody (i.e., we are in SYN_SENT). */
lorcansmith 0:2a53a4c3238c 805 if (pcb->state != SYN_SENT) {
lorcansmith 0:2a53a4c3238c 806 pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
lorcansmith 0:2a53a4c3238c 807 }
lorcansmith 0:2a53a4c3238c 808
lorcansmith 0:2a53a4c3238c 809 /* Reset the retransmission timer. */
lorcansmith 0:2a53a4c3238c 810 pcb->rtime = 0;
lorcansmith 0:2a53a4c3238c 811
lorcansmith 0:2a53a4c3238c 812 /* Reduce congestion window and ssthresh. */
lorcansmith 0:2a53a4c3238c 813 eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
lorcansmith 0:2a53a4c3238c 814 pcb->ssthresh = eff_wnd >> 1;
lorcansmith 0:2a53a4c3238c 815 if (pcb->ssthresh < (pcb->mss << 1)) {
lorcansmith 0:2a53a4c3238c 816 pcb->ssthresh = (pcb->mss << 1);
lorcansmith 0:2a53a4c3238c 817 }
lorcansmith 0:2a53a4c3238c 818 pcb->cwnd = pcb->mss;
lorcansmith 0:2a53a4c3238c 819 LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F
lorcansmith 0:2a53a4c3238c 820 " ssthresh %"U16_F"\n",
lorcansmith 0:2a53a4c3238c 821 pcb->cwnd, pcb->ssthresh));
lorcansmith 0:2a53a4c3238c 822
lorcansmith 0:2a53a4c3238c 823 /* The following needs to be called AFTER cwnd is set to one
lorcansmith 0:2a53a4c3238c 824 mss - STJ */
lorcansmith 0:2a53a4c3238c 825 tcp_rexmit_rto(pcb);
lorcansmith 0:2a53a4c3238c 826 }
lorcansmith 0:2a53a4c3238c 827 }
lorcansmith 0:2a53a4c3238c 828 }
lorcansmith 0:2a53a4c3238c 829 /* Check if this PCB has stayed too long in FIN-WAIT-2 */
lorcansmith 0:2a53a4c3238c 830 if (pcb->state == FIN_WAIT_2) {
lorcansmith 0:2a53a4c3238c 831 if ((u32_t)(tcp_ticks - pcb->tmr) >
lorcansmith 0:2a53a4c3238c 832 TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
lorcansmith 0:2a53a4c3238c 833 ++pcb_remove;
lorcansmith 0:2a53a4c3238c 834 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
lorcansmith 0:2a53a4c3238c 835 }
lorcansmith 0:2a53a4c3238c 836 }
lorcansmith 0:2a53a4c3238c 837
lorcansmith 0:2a53a4c3238c 838 /* Check if KEEPALIVE should be sent */
lorcansmith 0:2a53a4c3238c 839 if((pcb->so_options & SOF_KEEPALIVE) &&
lorcansmith 0:2a53a4c3238c 840 ((pcb->state == ESTABLISHED) ||
lorcansmith 0:2a53a4c3238c 841 (pcb->state == CLOSE_WAIT))) {
lorcansmith 0:2a53a4c3238c 842 #if LWIP_TCP_KEEPALIVE
lorcansmith 0:2a53a4c3238c 843 if((u32_t)(tcp_ticks - pcb->tmr) >
lorcansmith 0:2a53a4c3238c 844 (pcb->keep_idle + (pcb->keep_cnt*pcb->keep_intvl))
lorcansmith 0:2a53a4c3238c 845 / TCP_SLOW_INTERVAL)
lorcansmith 0:2a53a4c3238c 846 #else
lorcansmith 0:2a53a4c3238c 847 if((u32_t)(tcp_ticks - pcb->tmr) >
lorcansmith 0:2a53a4c3238c 848 (pcb->keep_idle + TCP_MAXIDLE) / TCP_SLOW_INTERVAL)
lorcansmith 0:2a53a4c3238c 849 #endif /* LWIP_TCP_KEEPALIVE */
lorcansmith 0:2a53a4c3238c 850 {
lorcansmith 0:2a53a4c3238c 851 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n",
lorcansmith 0:2a53a4c3238c 852 ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
lorcansmith 0:2a53a4c3238c 853 ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
lorcansmith 0:2a53a4c3238c 854
lorcansmith 0:2a53a4c3238c 855 ++pcb_remove;
lorcansmith 0:2a53a4c3238c 856 ++pcb_reset;
lorcansmith 0:2a53a4c3238c 857 }
lorcansmith 0:2a53a4c3238c 858 #if LWIP_TCP_KEEPALIVE
lorcansmith 0:2a53a4c3238c 859 else if((u32_t)(tcp_ticks - pcb->tmr) >
lorcansmith 0:2a53a4c3238c 860 (pcb->keep_idle + pcb->keep_cnt_sent * pcb->keep_intvl)
lorcansmith 0:2a53a4c3238c 861 / TCP_SLOW_INTERVAL)
lorcansmith 0:2a53a4c3238c 862 #else
lorcansmith 0:2a53a4c3238c 863 else if((u32_t)(tcp_ticks - pcb->tmr) >
lorcansmith 0:2a53a4c3238c 864 (pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEPINTVL_DEFAULT)
lorcansmith 0:2a53a4c3238c 865 / TCP_SLOW_INTERVAL)
lorcansmith 0:2a53a4c3238c 866 #endif /* LWIP_TCP_KEEPALIVE */
lorcansmith 0:2a53a4c3238c 867 {
lorcansmith 0:2a53a4c3238c 868 tcp_keepalive(pcb);
lorcansmith 0:2a53a4c3238c 869 pcb->keep_cnt_sent++;
lorcansmith 0:2a53a4c3238c 870 }
lorcansmith 0:2a53a4c3238c 871 }
lorcansmith 0:2a53a4c3238c 872
lorcansmith 0:2a53a4c3238c 873 /* If this PCB has queued out of sequence data, but has been
lorcansmith 0:2a53a4c3238c 874 inactive for too long, will drop the data (it will eventually
lorcansmith 0:2a53a4c3238c 875 be retransmitted). */
lorcansmith 0:2a53a4c3238c 876 #if TCP_QUEUE_OOSEQ
lorcansmith 0:2a53a4c3238c 877 if (pcb->ooseq != NULL &&
lorcansmith 0:2a53a4c3238c 878 (u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) {
lorcansmith 0:2a53a4c3238c 879 tcp_segs_free(pcb->ooseq);
lorcansmith 0:2a53a4c3238c 880 pcb->ooseq = NULL;
lorcansmith 0:2a53a4c3238c 881 LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
lorcansmith 0:2a53a4c3238c 882 }
lorcansmith 0:2a53a4c3238c 883 #endif /* TCP_QUEUE_OOSEQ */
lorcansmith 0:2a53a4c3238c 884
lorcansmith 0:2a53a4c3238c 885 /* Check if this PCB has stayed too long in SYN-RCVD */
lorcansmith 0:2a53a4c3238c 886 if (pcb->state == SYN_RCVD) {
lorcansmith 0:2a53a4c3238c 887 if ((u32_t)(tcp_ticks - pcb->tmr) >
lorcansmith 0:2a53a4c3238c 888 TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
lorcansmith 0:2a53a4c3238c 889 ++pcb_remove;
lorcansmith 0:2a53a4c3238c 890 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
lorcansmith 0:2a53a4c3238c 891 }
lorcansmith 0:2a53a4c3238c 892 }
lorcansmith 0:2a53a4c3238c 893
lorcansmith 0:2a53a4c3238c 894 /* Check if this PCB has stayed too long in LAST-ACK */
lorcansmith 0:2a53a4c3238c 895 if (pcb->state == LAST_ACK) {
lorcansmith 0:2a53a4c3238c 896 if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
lorcansmith 0:2a53a4c3238c 897 ++pcb_remove;
lorcansmith 0:2a53a4c3238c 898 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
lorcansmith 0:2a53a4c3238c 899 }
lorcansmith 0:2a53a4c3238c 900 }
lorcansmith 0:2a53a4c3238c 901
lorcansmith 0:2a53a4c3238c 902 /* If the PCB should be removed, do it. */
lorcansmith 0:2a53a4c3238c 903 if (pcb_remove) {
lorcansmith 0:2a53a4c3238c 904 tcp_pcb_purge(pcb);
lorcansmith 0:2a53a4c3238c 905 /* Remove PCB from tcp_active_pcbs list. */
lorcansmith 0:2a53a4c3238c 906 if (prev != NULL) {
lorcansmith 0:2a53a4c3238c 907 LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
lorcansmith 0:2a53a4c3238c 908 prev->next = pcb->next;
lorcansmith 0:2a53a4c3238c 909 } else {
lorcansmith 0:2a53a4c3238c 910 /* This PCB was the first. */
lorcansmith 0:2a53a4c3238c 911 LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
lorcansmith 0:2a53a4c3238c 912 tcp_active_pcbs = pcb->next;
lorcansmith 0:2a53a4c3238c 913 }
lorcansmith 0:2a53a4c3238c 914
lorcansmith 0:2a53a4c3238c 915 TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_ABRT);
lorcansmith 0:2a53a4c3238c 916 if (pcb_reset) {
lorcansmith 0:2a53a4c3238c 917 tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
lorcansmith 0:2a53a4c3238c 918 pcb->local_port, pcb->remote_port);
lorcansmith 0:2a53a4c3238c 919 }
lorcansmith 0:2a53a4c3238c 920
lorcansmith 0:2a53a4c3238c 921 pcb2 = pcb->next;
lorcansmith 0:2a53a4c3238c 922 memp_free(MEMP_TCP_PCB, pcb);
lorcansmith 0:2a53a4c3238c 923 pcb = pcb2;
lorcansmith 0:2a53a4c3238c 924 } else {
lorcansmith 0:2a53a4c3238c 925 /* get the 'next' element now and work with 'prev' below (in case of abort) */
lorcansmith 0:2a53a4c3238c 926 prev = pcb;
lorcansmith 0:2a53a4c3238c 927 pcb = pcb->next;
lorcansmith 0:2a53a4c3238c 928
lorcansmith 0:2a53a4c3238c 929 /* We check if we should poll the connection. */
lorcansmith 0:2a53a4c3238c 930 ++prev->polltmr;
lorcansmith 0:2a53a4c3238c 931 if (prev->polltmr >= prev->pollinterval) {
lorcansmith 0:2a53a4c3238c 932 prev->polltmr = 0;
lorcansmith 0:2a53a4c3238c 933 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
lorcansmith 0:2a53a4c3238c 934 TCP_EVENT_POLL(prev, err);
lorcansmith 0:2a53a4c3238c 935 /* if err == ERR_ABRT, 'prev' is already deallocated */
lorcansmith 0:2a53a4c3238c 936 if (err == ERR_OK) {
lorcansmith 0:2a53a4c3238c 937 tcp_output(prev);
lorcansmith 0:2a53a4c3238c 938 }
lorcansmith 0:2a53a4c3238c 939 }
lorcansmith 0:2a53a4c3238c 940 }
lorcansmith 0:2a53a4c3238c 941 }
lorcansmith 0:2a53a4c3238c 942
lorcansmith 0:2a53a4c3238c 943
lorcansmith 0:2a53a4c3238c 944 /* Steps through all of the TIME-WAIT PCBs. */
lorcansmith 0:2a53a4c3238c 945 prev = NULL;
lorcansmith 0:2a53a4c3238c 946 pcb = tcp_tw_pcbs;
lorcansmith 0:2a53a4c3238c 947 while (pcb != NULL) {
lorcansmith 0:2a53a4c3238c 948 LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
lorcansmith 0:2a53a4c3238c 949 pcb_remove = 0;
lorcansmith 0:2a53a4c3238c 950
lorcansmith 0:2a53a4c3238c 951 /* Check if this PCB has stayed long enough in TIME-WAIT */
lorcansmith 0:2a53a4c3238c 952 if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
lorcansmith 0:2a53a4c3238c 953 ++pcb_remove;
lorcansmith 0:2a53a4c3238c 954 }
lorcansmith 0:2a53a4c3238c 955
lorcansmith 0:2a53a4c3238c 956
lorcansmith 0:2a53a4c3238c 957
lorcansmith 0:2a53a4c3238c 958 /* If the PCB should be removed, do it. */
lorcansmith 0:2a53a4c3238c 959 if (pcb_remove) {
lorcansmith 0:2a53a4c3238c 960 tcp_pcb_purge(pcb);
lorcansmith 0:2a53a4c3238c 961 /* Remove PCB from tcp_tw_pcbs list. */
lorcansmith 0:2a53a4c3238c 962 if (prev != NULL) {
lorcansmith 0:2a53a4c3238c 963 LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
lorcansmith 0:2a53a4c3238c 964 prev->next = pcb->next;
lorcansmith 0:2a53a4c3238c 965 } else {
lorcansmith 0:2a53a4c3238c 966 /* This PCB was the first. */
lorcansmith 0:2a53a4c3238c 967 LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
lorcansmith 0:2a53a4c3238c 968 tcp_tw_pcbs = pcb->next;
lorcansmith 0:2a53a4c3238c 969 }
lorcansmith 0:2a53a4c3238c 970 pcb2 = pcb->next;
lorcansmith 0:2a53a4c3238c 971 memp_free(MEMP_TCP_PCB, pcb);
lorcansmith 0:2a53a4c3238c 972 pcb = pcb2;
lorcansmith 0:2a53a4c3238c 973 } else {
lorcansmith 0:2a53a4c3238c 974 prev = pcb;
lorcansmith 0:2a53a4c3238c 975 pcb = pcb->next;
lorcansmith 0:2a53a4c3238c 976 }
lorcansmith 0:2a53a4c3238c 977 }
lorcansmith 0:2a53a4c3238c 978 }
lorcansmith 0:2a53a4c3238c 979
lorcansmith 0:2a53a4c3238c 980 /**
lorcansmith 0:2a53a4c3238c 981 * Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
lorcansmith 0:2a53a4c3238c 982 * "refused" by upper layer (application) and sends delayed ACKs.
lorcansmith 0:2a53a4c3238c 983 *
lorcansmith 0:2a53a4c3238c 984 * Automatically called from tcp_tmr().
lorcansmith 0:2a53a4c3238c 985 */
lorcansmith 0:2a53a4c3238c 986 void
lorcansmith 0:2a53a4c3238c 987 tcp_fasttmr(void)
lorcansmith 0:2a53a4c3238c 988 {
lorcansmith 0:2a53a4c3238c 989 struct tcp_pcb *pcb = tcp_active_pcbs;
lorcansmith 0:2a53a4c3238c 990
lorcansmith 0:2a53a4c3238c 991 while(pcb != NULL) {
lorcansmith 0:2a53a4c3238c 992 struct tcp_pcb *next = pcb->next;
lorcansmith 0:2a53a4c3238c 993 /* If there is data which was previously "refused" by upper layer */
lorcansmith 0:2a53a4c3238c 994 if (pcb->refused_data != NULL) {
lorcansmith 0:2a53a4c3238c 995 /* Notify again application with data previously received. */
lorcansmith 0:2a53a4c3238c 996 err_t err;
lorcansmith 0:2a53a4c3238c 997 LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_fasttmr: notify kept packet\n"));
lorcansmith 0:2a53a4c3238c 998 TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
lorcansmith 0:2a53a4c3238c 999 if (err == ERR_OK) {
lorcansmith 0:2a53a4c3238c 1000 pcb->refused_data = NULL;
lorcansmith 0:2a53a4c3238c 1001 } else if (err == ERR_ABRT) {
lorcansmith 0:2a53a4c3238c 1002 /* if err == ERR_ABRT, 'pcb' is already deallocated */
lorcansmith 0:2a53a4c3238c 1003 pcb = NULL;
lorcansmith 0:2a53a4c3238c 1004 }
lorcansmith 0:2a53a4c3238c 1005 }
lorcansmith 0:2a53a4c3238c 1006
lorcansmith 0:2a53a4c3238c 1007 /* send delayed ACKs */
lorcansmith 0:2a53a4c3238c 1008 if (pcb && (pcb->flags & TF_ACK_DELAY)) {
lorcansmith 0:2a53a4c3238c 1009 LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
lorcansmith 0:2a53a4c3238c 1010 tcp_ack_now(pcb);
lorcansmith 0:2a53a4c3238c 1011 tcp_output(pcb);
lorcansmith 0:2a53a4c3238c 1012 pcb->flags &= ~(TF_ACK_DELAY | TF_ACK_NOW);
lorcansmith 0:2a53a4c3238c 1013 }
lorcansmith 0:2a53a4c3238c 1014
lorcansmith 0:2a53a4c3238c 1015 pcb = next;
lorcansmith 0:2a53a4c3238c 1016 }
lorcansmith 0:2a53a4c3238c 1017 }
lorcansmith 0:2a53a4c3238c 1018
lorcansmith 0:2a53a4c3238c 1019 /**
lorcansmith 0:2a53a4c3238c 1020 * Deallocates a list of TCP segments (tcp_seg structures).
lorcansmith 0:2a53a4c3238c 1021 *
lorcansmith 0:2a53a4c3238c 1022 * @param seg tcp_seg list of TCP segments to free
lorcansmith 0:2a53a4c3238c 1023 */
lorcansmith 0:2a53a4c3238c 1024 void
lorcansmith 0:2a53a4c3238c 1025 tcp_segs_free(struct tcp_seg *seg)
lorcansmith 0:2a53a4c3238c 1026 {
lorcansmith 0:2a53a4c3238c 1027 while (seg != NULL) {
lorcansmith 0:2a53a4c3238c 1028 struct tcp_seg *next = seg->next;
lorcansmith 0:2a53a4c3238c 1029 tcp_seg_free(seg);
lorcansmith 0:2a53a4c3238c 1030 seg = next;
lorcansmith 0:2a53a4c3238c 1031 }
lorcansmith 0:2a53a4c3238c 1032 }
lorcansmith 0:2a53a4c3238c 1033
lorcansmith 0:2a53a4c3238c 1034 /**
lorcansmith 0:2a53a4c3238c 1035 * Frees a TCP segment (tcp_seg structure).
lorcansmith 0:2a53a4c3238c 1036 *
lorcansmith 0:2a53a4c3238c 1037 * @param seg single tcp_seg to free
lorcansmith 0:2a53a4c3238c 1038 */
lorcansmith 0:2a53a4c3238c 1039 void
lorcansmith 0:2a53a4c3238c 1040 tcp_seg_free(struct tcp_seg *seg)
lorcansmith 0:2a53a4c3238c 1041 {
lorcansmith 0:2a53a4c3238c 1042 if (seg != NULL) {
lorcansmith 0:2a53a4c3238c 1043 if (seg->p != NULL) {
lorcansmith 0:2a53a4c3238c 1044 pbuf_free(seg->p);
lorcansmith 0:2a53a4c3238c 1045 #if TCP_DEBUG
lorcansmith 0:2a53a4c3238c 1046 seg->p = NULL;
lorcansmith 0:2a53a4c3238c 1047 #endif /* TCP_DEBUG */
lorcansmith 0:2a53a4c3238c 1048 }
lorcansmith 0:2a53a4c3238c 1049 memp_free(MEMP_TCP_SEG, seg);
lorcansmith 0:2a53a4c3238c 1050 }
lorcansmith 0:2a53a4c3238c 1051 }
lorcansmith 0:2a53a4c3238c 1052
lorcansmith 0:2a53a4c3238c 1053 /**
lorcansmith 0:2a53a4c3238c 1054 * Sets the priority of a connection.
lorcansmith 0:2a53a4c3238c 1055 *
lorcansmith 0:2a53a4c3238c 1056 * @param pcb the tcp_pcb to manipulate
lorcansmith 0:2a53a4c3238c 1057 * @param prio new priority
lorcansmith 0:2a53a4c3238c 1058 */
lorcansmith 0:2a53a4c3238c 1059 void
lorcansmith 0:2a53a4c3238c 1060 tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
lorcansmith 0:2a53a4c3238c 1061 {
lorcansmith 0:2a53a4c3238c 1062 pcb->prio = prio;
lorcansmith 0:2a53a4c3238c 1063 }
lorcansmith 0:2a53a4c3238c 1064
lorcansmith 0:2a53a4c3238c 1065 #if TCP_QUEUE_OOSEQ
lorcansmith 0:2a53a4c3238c 1066 /**
lorcansmith 0:2a53a4c3238c 1067 * Returns a copy of the given TCP segment.
lorcansmith 0:2a53a4c3238c 1068 * The pbuf and data are not copied, only the pointers
lorcansmith 0:2a53a4c3238c 1069 *
lorcansmith 0:2a53a4c3238c 1070 * @param seg the old tcp_seg
lorcansmith 0:2a53a4c3238c 1071 * @return a copy of seg
lorcansmith 0:2a53a4c3238c 1072 */
lorcansmith 0:2a53a4c3238c 1073 struct tcp_seg *
lorcansmith 0:2a53a4c3238c 1074 tcp_seg_copy(struct tcp_seg *seg)
lorcansmith 0:2a53a4c3238c 1075 {
lorcansmith 0:2a53a4c3238c 1076 struct tcp_seg *cseg;
lorcansmith 0:2a53a4c3238c 1077
lorcansmith 0:2a53a4c3238c 1078 cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG);
lorcansmith 0:2a53a4c3238c 1079 if (cseg == NULL) {
lorcansmith 0:2a53a4c3238c 1080 return NULL;
lorcansmith 0:2a53a4c3238c 1081 }
lorcansmith 0:2a53a4c3238c 1082 SMEMCPY((u8_t *)cseg, (const u8_t *)seg, sizeof(struct tcp_seg));
lorcansmith 0:2a53a4c3238c 1083 pbuf_ref(cseg->p);
lorcansmith 0:2a53a4c3238c 1084 return cseg;
lorcansmith 0:2a53a4c3238c 1085 }
lorcansmith 0:2a53a4c3238c 1086 #endif /* TCP_QUEUE_OOSEQ */
lorcansmith 0:2a53a4c3238c 1087
lorcansmith 0:2a53a4c3238c 1088 #if LWIP_CALLBACK_API
lorcansmith 0:2a53a4c3238c 1089 /**
lorcansmith 0:2a53a4c3238c 1090 * Default receive callback that is called if the user didn't register
lorcansmith 0:2a53a4c3238c 1091 * a recv callback for the pcb.
lorcansmith 0:2a53a4c3238c 1092 */
lorcansmith 0:2a53a4c3238c 1093 err_t
lorcansmith 0:2a53a4c3238c 1094 tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
lorcansmith 0:2a53a4c3238c 1095 {
lorcansmith 0:2a53a4c3238c 1096 LWIP_UNUSED_ARG(arg);
lorcansmith 0:2a53a4c3238c 1097 if (p != NULL) {
lorcansmith 0:2a53a4c3238c 1098 tcp_recved(pcb, p->tot_len);
lorcansmith 0:2a53a4c3238c 1099 pbuf_free(p);
lorcansmith 0:2a53a4c3238c 1100 } else if (err == ERR_OK) {
lorcansmith 0:2a53a4c3238c 1101 return tcp_close(pcb);
lorcansmith 0:2a53a4c3238c 1102 }
lorcansmith 0:2a53a4c3238c 1103 return ERR_OK;
lorcansmith 0:2a53a4c3238c 1104 }
lorcansmith 0:2a53a4c3238c 1105 #endif /* LWIP_CALLBACK_API */
lorcansmith 0:2a53a4c3238c 1106
lorcansmith 0:2a53a4c3238c 1107 /**
lorcansmith 0:2a53a4c3238c 1108 * Kills the oldest active connection that has lower priority than prio.
lorcansmith 0:2a53a4c3238c 1109 *
lorcansmith 0:2a53a4c3238c 1110 * @param prio minimum priority
lorcansmith 0:2a53a4c3238c 1111 */
lorcansmith 0:2a53a4c3238c 1112 static void
lorcansmith 0:2a53a4c3238c 1113 tcp_kill_prio(u8_t prio)
lorcansmith 0:2a53a4c3238c 1114 {
lorcansmith 0:2a53a4c3238c 1115 struct tcp_pcb *pcb, *inactive;
lorcansmith 0:2a53a4c3238c 1116 u32_t inactivity;
lorcansmith 0:2a53a4c3238c 1117 u8_t mprio;
lorcansmith 0:2a53a4c3238c 1118
lorcansmith 0:2a53a4c3238c 1119
lorcansmith 0:2a53a4c3238c 1120 mprio = TCP_PRIO_MAX;
lorcansmith 0:2a53a4c3238c 1121
lorcansmith 0:2a53a4c3238c 1122 /* We kill the oldest active connection that has lower priority than prio. */
lorcansmith 0:2a53a4c3238c 1123 inactivity = 0;
lorcansmith 0:2a53a4c3238c 1124 inactive = NULL;
lorcansmith 0:2a53a4c3238c 1125 for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
lorcansmith 0:2a53a4c3238c 1126 if (pcb->prio <= prio &&
lorcansmith 0:2a53a4c3238c 1127 pcb->prio <= mprio &&
lorcansmith 0:2a53a4c3238c 1128 (u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
lorcansmith 0:2a53a4c3238c 1129 inactivity = tcp_ticks - pcb->tmr;
lorcansmith 0:2a53a4c3238c 1130 inactive = pcb;
lorcansmith 0:2a53a4c3238c 1131 mprio = pcb->prio;
lorcansmith 0:2a53a4c3238c 1132 }
lorcansmith 0:2a53a4c3238c 1133 }
lorcansmith 0:2a53a4c3238c 1134 if (inactive != NULL) {
lorcansmith 0:2a53a4c3238c 1135 LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n",
lorcansmith 0:2a53a4c3238c 1136 (void *)inactive, inactivity));
lorcansmith 0:2a53a4c3238c 1137 tcp_abort(inactive);
lorcansmith 0:2a53a4c3238c 1138 }
lorcansmith 0:2a53a4c3238c 1139 }
lorcansmith 0:2a53a4c3238c 1140
lorcansmith 0:2a53a4c3238c 1141 /**
lorcansmith 0:2a53a4c3238c 1142 * Kills the oldest connection that is in TIME_WAIT state.
lorcansmith 0:2a53a4c3238c 1143 * Called from tcp_alloc() if no more connections are available.
lorcansmith 0:2a53a4c3238c 1144 */
lorcansmith 0:2a53a4c3238c 1145 static void
lorcansmith 0:2a53a4c3238c 1146 tcp_kill_timewait(void)
lorcansmith 0:2a53a4c3238c 1147 {
lorcansmith 0:2a53a4c3238c 1148 struct tcp_pcb *pcb, *inactive;
lorcansmith 0:2a53a4c3238c 1149 u32_t inactivity;
lorcansmith 0:2a53a4c3238c 1150
lorcansmith 0:2a53a4c3238c 1151 inactivity = 0;
lorcansmith 0:2a53a4c3238c 1152 inactive = NULL;
lorcansmith 0:2a53a4c3238c 1153 /* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
lorcansmith 0:2a53a4c3238c 1154 for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
lorcansmith 0:2a53a4c3238c 1155 if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
lorcansmith 0:2a53a4c3238c 1156 inactivity = tcp_ticks - pcb->tmr;
lorcansmith 0:2a53a4c3238c 1157 inactive = pcb;
lorcansmith 0:2a53a4c3238c 1158 }
lorcansmith 0:2a53a4c3238c 1159 }
lorcansmith 0:2a53a4c3238c 1160 if (inactive != NULL) {
lorcansmith 0:2a53a4c3238c 1161 LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n",
lorcansmith 0:2a53a4c3238c 1162 (void *)inactive, inactivity));
lorcansmith 0:2a53a4c3238c 1163 tcp_abort(inactive);
lorcansmith 0:2a53a4c3238c 1164 }
lorcansmith 0:2a53a4c3238c 1165 }
lorcansmith 0:2a53a4c3238c 1166
lorcansmith 0:2a53a4c3238c 1167 /**
lorcansmith 0:2a53a4c3238c 1168 * Allocate a new tcp_pcb structure.
lorcansmith 0:2a53a4c3238c 1169 *
lorcansmith 0:2a53a4c3238c 1170 * @param prio priority for the new pcb
lorcansmith 0:2a53a4c3238c 1171 * @return a new tcp_pcb that initially is in state CLOSED
lorcansmith 0:2a53a4c3238c 1172 */
lorcansmith 0:2a53a4c3238c 1173 struct tcp_pcb *
lorcansmith 0:2a53a4c3238c 1174 tcp_alloc(u8_t prio)
lorcansmith 0:2a53a4c3238c 1175 {
lorcansmith 0:2a53a4c3238c 1176 struct tcp_pcb *pcb;
lorcansmith 0:2a53a4c3238c 1177 u32_t iss;
lorcansmith 0:2a53a4c3238c 1178
lorcansmith 0:2a53a4c3238c 1179 pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
lorcansmith 0:2a53a4c3238c 1180 if (pcb == NULL) {
lorcansmith 0:2a53a4c3238c 1181 /* Try killing oldest connection in TIME-WAIT. */
lorcansmith 0:2a53a4c3238c 1182 LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
lorcansmith 0:2a53a4c3238c 1183 tcp_kill_timewait();
lorcansmith 0:2a53a4c3238c 1184 /* Try to allocate a tcp_pcb again. */
lorcansmith 0:2a53a4c3238c 1185 pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
lorcansmith 0:2a53a4c3238c 1186 if (pcb == NULL) {
lorcansmith 0:2a53a4c3238c 1187 /* Try killing active connections with lower priority than the new one. */
lorcansmith 0:2a53a4c3238c 1188 LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing connection with prio lower than %d\n", prio));
lorcansmith 0:2a53a4c3238c 1189 tcp_kill_prio(prio);
lorcansmith 0:2a53a4c3238c 1190 /* Try to allocate a tcp_pcb again. */
lorcansmith 0:2a53a4c3238c 1191 pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
lorcansmith 0:2a53a4c3238c 1192 if (pcb != NULL) {
lorcansmith 0:2a53a4c3238c 1193 /* adjust err stats: memp_malloc failed twice before */
lorcansmith 0:2a53a4c3238c 1194 MEMP_STATS_DEC(err, MEMP_TCP_PCB);
lorcansmith 0:2a53a4c3238c 1195 }
lorcansmith 0:2a53a4c3238c 1196 }
lorcansmith 0:2a53a4c3238c 1197 if (pcb != NULL) {
lorcansmith 0:2a53a4c3238c 1198 /* adjust err stats: timewait PCB was freed above */
lorcansmith 0:2a53a4c3238c 1199 MEMP_STATS_DEC(err, MEMP_TCP_PCB);
lorcansmith 0:2a53a4c3238c 1200 }
lorcansmith 0:2a53a4c3238c 1201 }
lorcansmith 0:2a53a4c3238c 1202 if (pcb != NULL) {
lorcansmith 0:2a53a4c3238c 1203 memset(pcb, 0, sizeof(struct tcp_pcb));
lorcansmith 0:2a53a4c3238c 1204 pcb->prio = prio;
lorcansmith 0:2a53a4c3238c 1205 pcb->snd_buf = TCP_SND_BUF;
lorcansmith 0:2a53a4c3238c 1206 pcb->snd_queuelen = 0;
lorcansmith 0:2a53a4c3238c 1207 pcb->rcv_wnd = TCP_WND;
lorcansmith 0:2a53a4c3238c 1208 pcb->rcv_ann_wnd = TCP_WND;
lorcansmith 0:2a53a4c3238c 1209 pcb->tos = 0;
lorcansmith 0:2a53a4c3238c 1210 pcb->ttl = TCP_TTL;
lorcansmith 0:2a53a4c3238c 1211 /* As initial send MSS, we use TCP_MSS but limit it to 536.
lorcansmith 0:2a53a4c3238c 1212 The send MSS is updated when an MSS option is received. */
lorcansmith 0:2a53a4c3238c 1213 pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
lorcansmith 0:2a53a4c3238c 1214 pcb->rto = 3000 / TCP_SLOW_INTERVAL;
lorcansmith 0:2a53a4c3238c 1215 pcb->sa = 0;
lorcansmith 0:2a53a4c3238c 1216 pcb->sv = 3000 / TCP_SLOW_INTERVAL;
lorcansmith 0:2a53a4c3238c 1217 pcb->rtime = -1;
lorcansmith 0:2a53a4c3238c 1218 pcb->cwnd = 1;
lorcansmith 0:2a53a4c3238c 1219 iss = tcp_next_iss();
lorcansmith 0:2a53a4c3238c 1220 pcb->snd_wl2 = iss;
lorcansmith 0:2a53a4c3238c 1221 pcb->snd_nxt = iss;
lorcansmith 0:2a53a4c3238c 1222 pcb->lastack = iss;
lorcansmith 0:2a53a4c3238c 1223 pcb->snd_lbb = iss;
lorcansmith 0:2a53a4c3238c 1224 pcb->tmr = tcp_ticks;
lorcansmith 0:2a53a4c3238c 1225
lorcansmith 0:2a53a4c3238c 1226 LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: tcp_ticks=%"U32_F" iss=%"U32_F"\n", tcp_ticks, iss));
lorcansmith 0:2a53a4c3238c 1227
lorcansmith 0:2a53a4c3238c 1228 pcb->polltmr = 0;
lorcansmith 0:2a53a4c3238c 1229
lorcansmith 0:2a53a4c3238c 1230 #if LWIP_CALLBACK_API
lorcansmith 0:2a53a4c3238c 1231 pcb->recv = tcp_recv_null;
lorcansmith 0:2a53a4c3238c 1232 #endif /* LWIP_CALLBACK_API */
lorcansmith 0:2a53a4c3238c 1233
lorcansmith 0:2a53a4c3238c 1234 /* Init KEEPALIVE timer */
lorcansmith 0:2a53a4c3238c 1235 pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
lorcansmith 0:2a53a4c3238c 1236
lorcansmith 0:2a53a4c3238c 1237 #if LWIP_TCP_KEEPALIVE
lorcansmith 0:2a53a4c3238c 1238 pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
lorcansmith 0:2a53a4c3238c 1239 pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
lorcansmith 0:2a53a4c3238c 1240 #endif /* LWIP_TCP_KEEPALIVE */
lorcansmith 0:2a53a4c3238c 1241
lorcansmith 0:2a53a4c3238c 1242 pcb->keep_cnt_sent = 0;
lorcansmith 0:2a53a4c3238c 1243 }
lorcansmith 0:2a53a4c3238c 1244 return pcb;
lorcansmith 0:2a53a4c3238c 1245 }
lorcansmith 0:2a53a4c3238c 1246
lorcansmith 0:2a53a4c3238c 1247 /**
lorcansmith 0:2a53a4c3238c 1248 * Creates a new TCP protocol control block but doesn't place it on
lorcansmith 0:2a53a4c3238c 1249 * any of the TCP PCB lists.
lorcansmith 0:2a53a4c3238c 1250 * The pcb is not put on any list until binding using tcp_bind().
lorcansmith 0:2a53a4c3238c 1251 *
lorcansmith 0:2a53a4c3238c 1252 * @internal: Maybe there should be a idle TCP PCB list where these
lorcansmith 0:2a53a4c3238c 1253 * PCBs are put on. Port reservation using tcp_bind() is implemented but
lorcansmith 0:2a53a4c3238c 1254 * allocated pcbs that are not bound can't be killed automatically if wanting
lorcansmith 0:2a53a4c3238c 1255 * to allocate a pcb with higher prio (@see tcp_kill_prio())
lorcansmith 0:2a53a4c3238c 1256 *
lorcansmith 0:2a53a4c3238c 1257 * @return a new tcp_pcb that initially is in state CLOSED
lorcansmith 0:2a53a4c3238c 1258 */
lorcansmith 0:2a53a4c3238c 1259 struct tcp_pcb *
lorcansmith 0:2a53a4c3238c 1260 tcp_new(void)
lorcansmith 0:2a53a4c3238c 1261 {
lorcansmith 0:2a53a4c3238c 1262 return tcp_alloc(TCP_PRIO_NORMAL);
lorcansmith 0:2a53a4c3238c 1263 }
lorcansmith 0:2a53a4c3238c 1264
lorcansmith 0:2a53a4c3238c 1265 /**
lorcansmith 0:2a53a4c3238c 1266 * Used to specify the argument that should be passed callback
lorcansmith 0:2a53a4c3238c 1267 * functions.
lorcansmith 0:2a53a4c3238c 1268 *
lorcansmith 0:2a53a4c3238c 1269 * @param pcb tcp_pcb to set the callback argument
lorcansmith 0:2a53a4c3238c 1270 * @param arg void pointer argument to pass to callback functions
lorcansmith 0:2a53a4c3238c 1271 */
lorcansmith 0:2a53a4c3238c 1272 void
lorcansmith 0:2a53a4c3238c 1273 tcp_arg(struct tcp_pcb *pcb, void *arg)
lorcansmith 0:2a53a4c3238c 1274 {
lorcansmith 0:2a53a4c3238c 1275 pcb->callback_arg = arg;
lorcansmith 0:2a53a4c3238c 1276 }
lorcansmith 0:2a53a4c3238c 1277 #if LWIP_CALLBACK_API
lorcansmith 0:2a53a4c3238c 1278
lorcansmith 0:2a53a4c3238c 1279 /**
lorcansmith 0:2a53a4c3238c 1280 * Used to specify the function that should be called when a TCP
lorcansmith 0:2a53a4c3238c 1281 * connection receives data.
lorcansmith 0:2a53a4c3238c 1282 *
lorcansmith 0:2a53a4c3238c 1283 * @param pcb tcp_pcb to set the recv callback
lorcansmith 0:2a53a4c3238c 1284 * @param recv callback function to call for this pcb when data is received
lorcansmith 0:2a53a4c3238c 1285 */
lorcansmith 0:2a53a4c3238c 1286 void
lorcansmith 0:2a53a4c3238c 1287 tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
lorcansmith 0:2a53a4c3238c 1288 {
lorcansmith 0:2a53a4c3238c 1289 pcb->recv = recv;
lorcansmith 0:2a53a4c3238c 1290 }
lorcansmith 0:2a53a4c3238c 1291
lorcansmith 0:2a53a4c3238c 1292 /**
lorcansmith 0:2a53a4c3238c 1293 * Used to specify the function that should be called when TCP data
lorcansmith 0:2a53a4c3238c 1294 * has been successfully delivered to the remote host.
lorcansmith 0:2a53a4c3238c 1295 *
lorcansmith 0:2a53a4c3238c 1296 * @param pcb tcp_pcb to set the sent callback
lorcansmith 0:2a53a4c3238c 1297 * @param sent callback function to call for this pcb when data is successfully sent
lorcansmith 0:2a53a4c3238c 1298 */
lorcansmith 0:2a53a4c3238c 1299 void
lorcansmith 0:2a53a4c3238c 1300 tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
lorcansmith 0:2a53a4c3238c 1301 {
lorcansmith 0:2a53a4c3238c 1302 pcb->sent = sent;
lorcansmith 0:2a53a4c3238c 1303 }
lorcansmith 0:2a53a4c3238c 1304
lorcansmith 0:2a53a4c3238c 1305 /**
lorcansmith 0:2a53a4c3238c 1306 * Used to specify the function that should be called when a fatal error
lorcansmith 0:2a53a4c3238c 1307 * has occured on the connection.
lorcansmith 0:2a53a4c3238c 1308 *
lorcansmith 0:2a53a4c3238c 1309 * @param pcb tcp_pcb to set the err callback
lorcansmith 0:2a53a4c3238c 1310 * @param err callback function to call for this pcb when a fatal error
lorcansmith 0:2a53a4c3238c 1311 * has occured on the connection
lorcansmith 0:2a53a4c3238c 1312 */
lorcansmith 0:2a53a4c3238c 1313 void
lorcansmith 0:2a53a4c3238c 1314 tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
lorcansmith 0:2a53a4c3238c 1315 {
lorcansmith 0:2a53a4c3238c 1316 pcb->errf = err;
lorcansmith 0:2a53a4c3238c 1317 }
lorcansmith 0:2a53a4c3238c 1318
lorcansmith 0:2a53a4c3238c 1319 /**
lorcansmith 0:2a53a4c3238c 1320 * Used for specifying the function that should be called when a
lorcansmith 0:2a53a4c3238c 1321 * LISTENing connection has been connected to another host.
lorcansmith 0:2a53a4c3238c 1322 *
lorcansmith 0:2a53a4c3238c 1323 * @param pcb tcp_pcb to set the accept callback
lorcansmith 0:2a53a4c3238c 1324 * @param accept callback function to call for this pcb when LISTENing
lorcansmith 0:2a53a4c3238c 1325 * connection has been connected to another host
lorcansmith 0:2a53a4c3238c 1326 */
lorcansmith 0:2a53a4c3238c 1327 void
lorcansmith 0:2a53a4c3238c 1328 tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
lorcansmith 0:2a53a4c3238c 1329 {
lorcansmith 0:2a53a4c3238c 1330 pcb->accept = accept;
lorcansmith 0:2a53a4c3238c 1331 }
lorcansmith 0:2a53a4c3238c 1332 #endif /* LWIP_CALLBACK_API */
lorcansmith 0:2a53a4c3238c 1333
lorcansmith 0:2a53a4c3238c 1334
lorcansmith 0:2a53a4c3238c 1335 /**
lorcansmith 0:2a53a4c3238c 1336 * Used to specify the function that should be called periodically
lorcansmith 0:2a53a4c3238c 1337 * from TCP. The interval is specified in terms of the TCP coarse
lorcansmith 0:2a53a4c3238c 1338 * timer interval, which is called twice a second.
lorcansmith 0:2a53a4c3238c 1339 *
lorcansmith 0:2a53a4c3238c 1340 */
lorcansmith 0:2a53a4c3238c 1341 void
lorcansmith 0:2a53a4c3238c 1342 tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
lorcansmith 0:2a53a4c3238c 1343 {
lorcansmith 0:2a53a4c3238c 1344 #if LWIP_CALLBACK_API
lorcansmith 0:2a53a4c3238c 1345 pcb->poll = poll;
lorcansmith 0:2a53a4c3238c 1346 #else /* LWIP_CALLBACK_API */
lorcansmith 0:2a53a4c3238c 1347 LWIP_UNUSED_ARG(poll);
lorcansmith 0:2a53a4c3238c 1348 #endif /* LWIP_CALLBACK_API */
lorcansmith 0:2a53a4c3238c 1349 pcb->pollinterval = interval;
lorcansmith 0:2a53a4c3238c 1350 }
lorcansmith 0:2a53a4c3238c 1351
lorcansmith 0:2a53a4c3238c 1352 /**
lorcansmith 0:2a53a4c3238c 1353 * Purges a TCP PCB. Removes any buffered data and frees the buffer memory
lorcansmith 0:2a53a4c3238c 1354 * (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
lorcansmith 0:2a53a4c3238c 1355 *
lorcansmith 0:2a53a4c3238c 1356 * @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
lorcansmith 0:2a53a4c3238c 1357 */
lorcansmith 0:2a53a4c3238c 1358 void
lorcansmith 0:2a53a4c3238c 1359 tcp_pcb_purge(struct tcp_pcb *pcb)
lorcansmith 0:2a53a4c3238c 1360 {
lorcansmith 0:2a53a4c3238c 1361 if (pcb->state != CLOSED &&
lorcansmith 0:2a53a4c3238c 1362 pcb->state != TIME_WAIT &&
lorcansmith 0:2a53a4c3238c 1363 pcb->state != LISTEN) {
lorcansmith 0:2a53a4c3238c 1364
lorcansmith 0:2a53a4c3238c 1365 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
lorcansmith 0:2a53a4c3238c 1366
lorcansmith 0:2a53a4c3238c 1367 #if TCP_LISTEN_BACKLOG
lorcansmith 0:2a53a4c3238c 1368 if (pcb->state == SYN_RCVD) {
lorcansmith 0:2a53a4c3238c 1369 /* Need to find the corresponding listen_pcb and decrease its accepts_pending */
lorcansmith 0:2a53a4c3238c 1370 struct tcp_pcb_listen *lpcb;
lorcansmith 0:2a53a4c3238c 1371 LWIP_ASSERT("tcp_pcb_purge: pcb->state == SYN_RCVD but tcp_listen_pcbs is NULL",
lorcansmith 0:2a53a4c3238c 1372 tcp_listen_pcbs.listen_pcbs != NULL);
lorcansmith 0:2a53a4c3238c 1373 for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
lorcansmith 0:2a53a4c3238c 1374 if ((lpcb->local_port == pcb->local_port) &&
lorcansmith 0:2a53a4c3238c 1375 (ip_addr_isany(&lpcb->local_ip) ||
lorcansmith 0:2a53a4c3238c 1376 ip_addr_cmp(&pcb->local_ip, &lpcb->local_ip))) {
lorcansmith 0:2a53a4c3238c 1377 /* port and address of the listen pcb match the timed-out pcb */
lorcansmith 0:2a53a4c3238c 1378 LWIP_ASSERT("tcp_pcb_purge: listen pcb does not have accepts pending",
lorcansmith 0:2a53a4c3238c 1379 lpcb->accepts_pending > 0);
lorcansmith 0:2a53a4c3238c 1380 lpcb->accepts_pending--;
lorcansmith 0:2a53a4c3238c 1381 break;
lorcansmith 0:2a53a4c3238c 1382 }
lorcansmith 0:2a53a4c3238c 1383 }
lorcansmith 0:2a53a4c3238c 1384 }
lorcansmith 0:2a53a4c3238c 1385 #endif /* TCP_LISTEN_BACKLOG */
lorcansmith 0:2a53a4c3238c 1386
lorcansmith 0:2a53a4c3238c 1387
lorcansmith 0:2a53a4c3238c 1388 if (pcb->refused_data != NULL) {
lorcansmith 0:2a53a4c3238c 1389 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
lorcansmith 0:2a53a4c3238c 1390 pbuf_free(pcb->refused_data);
lorcansmith 0:2a53a4c3238c 1391 pcb->refused_data = NULL;
lorcansmith 0:2a53a4c3238c 1392 }
lorcansmith 0:2a53a4c3238c 1393 if (pcb->unsent != NULL) {
lorcansmith 0:2a53a4c3238c 1394 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
lorcansmith 0:2a53a4c3238c 1395 }
lorcansmith 0:2a53a4c3238c 1396 if (pcb->unacked != NULL) {
lorcansmith 0:2a53a4c3238c 1397 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
lorcansmith 0:2a53a4c3238c 1398 }
lorcansmith 0:2a53a4c3238c 1399 #if TCP_QUEUE_OOSEQ
lorcansmith 0:2a53a4c3238c 1400 if (pcb->ooseq != NULL) {
lorcansmith 0:2a53a4c3238c 1401 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
lorcansmith 0:2a53a4c3238c 1402 }
lorcansmith 0:2a53a4c3238c 1403 tcp_segs_free(pcb->ooseq);
lorcansmith 0:2a53a4c3238c 1404 pcb->ooseq = NULL;
lorcansmith 0:2a53a4c3238c 1405 #endif /* TCP_QUEUE_OOSEQ */
lorcansmith 0:2a53a4c3238c 1406
lorcansmith 0:2a53a4c3238c 1407 /* Stop the retransmission timer as it will expect data on unacked
lorcansmith 0:2a53a4c3238c 1408 queue if it fires */
lorcansmith 0:2a53a4c3238c 1409 pcb->rtime = -1;
lorcansmith 0:2a53a4c3238c 1410
lorcansmith 0:2a53a4c3238c 1411 tcp_segs_free(pcb->unsent);
lorcansmith 0:2a53a4c3238c 1412 tcp_segs_free(pcb->unacked);
lorcansmith 0:2a53a4c3238c 1413 pcb->unacked = pcb->unsent = NULL;
lorcansmith 0:2a53a4c3238c 1414 #if TCP_OVERSIZE
lorcansmith 0:2a53a4c3238c 1415 pcb->unsent_oversize = 0;
lorcansmith 0:2a53a4c3238c 1416 #endif /* TCP_OVERSIZE */
lorcansmith 0:2a53a4c3238c 1417 }
lorcansmith 0:2a53a4c3238c 1418 }
lorcansmith 0:2a53a4c3238c 1419
lorcansmith 0:2a53a4c3238c 1420 /**
lorcansmith 0:2a53a4c3238c 1421 * Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
lorcansmith 0:2a53a4c3238c 1422 *
lorcansmith 0:2a53a4c3238c 1423 * @param pcblist PCB list to purge.
lorcansmith 0:2a53a4c3238c 1424 * @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
lorcansmith 0:2a53a4c3238c 1425 */
lorcansmith 0:2a53a4c3238c 1426 void
lorcansmith 0:2a53a4c3238c 1427 tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb)
lorcansmith 0:2a53a4c3238c 1428 {
lorcansmith 0:2a53a4c3238c 1429 TCP_RMV(pcblist, pcb);
lorcansmith 0:2a53a4c3238c 1430
lorcansmith 0:2a53a4c3238c 1431 tcp_pcb_purge(pcb);
lorcansmith 0:2a53a4c3238c 1432
lorcansmith 0:2a53a4c3238c 1433 /* if there is an outstanding delayed ACKs, send it */
lorcansmith 0:2a53a4c3238c 1434 if (pcb->state != TIME_WAIT &&
lorcansmith 0:2a53a4c3238c 1435 pcb->state != LISTEN &&
lorcansmith 0:2a53a4c3238c 1436 pcb->flags & TF_ACK_DELAY) {
lorcansmith 0:2a53a4c3238c 1437 pcb->flags |= TF_ACK_NOW;
lorcansmith 0:2a53a4c3238c 1438 tcp_output(pcb);
lorcansmith 0:2a53a4c3238c 1439 }
lorcansmith 0:2a53a4c3238c 1440
lorcansmith 0:2a53a4c3238c 1441 if (pcb->state != LISTEN) {
lorcansmith 0:2a53a4c3238c 1442 LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
lorcansmith 0:2a53a4c3238c 1443 LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
lorcansmith 0:2a53a4c3238c 1444 #if TCP_QUEUE_OOSEQ
lorcansmith 0:2a53a4c3238c 1445 LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
lorcansmith 0:2a53a4c3238c 1446 #endif /* TCP_QUEUE_OOSEQ */
lorcansmith 0:2a53a4c3238c 1447 }
lorcansmith 0:2a53a4c3238c 1448
lorcansmith 0:2a53a4c3238c 1449 pcb->state = CLOSED;
lorcansmith 0:2a53a4c3238c 1450
lorcansmith 0:2a53a4c3238c 1451 LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
lorcansmith 0:2a53a4c3238c 1452 }
lorcansmith 0:2a53a4c3238c 1453
lorcansmith 0:2a53a4c3238c 1454 /**
lorcansmith 0:2a53a4c3238c 1455 * Calculates a new initial sequence number for new connections.
lorcansmith 0:2a53a4c3238c 1456 *
lorcansmith 0:2a53a4c3238c 1457 * @return u32_t pseudo random sequence number
lorcansmith 0:2a53a4c3238c 1458 */
lorcansmith 0:2a53a4c3238c 1459 u32_t
lorcansmith 0:2a53a4c3238c 1460 tcp_next_iss(void)
lorcansmith 0:2a53a4c3238c 1461 {
lorcansmith 0:2a53a4c3238c 1462 static u32_t iss = 6510;
lorcansmith 0:2a53a4c3238c 1463
lorcansmith 0:2a53a4c3238c 1464 iss += tcp_ticks; /* XXX */
lorcansmith 0:2a53a4c3238c 1465 return iss;
lorcansmith 0:2a53a4c3238c 1466 }
lorcansmith 0:2a53a4c3238c 1467
lorcansmith 0:2a53a4c3238c 1468 #if TCP_CALCULATE_EFF_SEND_MSS
lorcansmith 0:2a53a4c3238c 1469 /**
lorcansmith 0:2a53a4c3238c 1470 * Calcluates the effective send mss that can be used for a specific IP address
lorcansmith 0:2a53a4c3238c 1471 * by using ip_route to determin the netif used to send to the address and
lorcansmith 0:2a53a4c3238c 1472 * calculating the minimum of TCP_MSS and that netif's mtu (if set).
lorcansmith 0:2a53a4c3238c 1473 */
lorcansmith 0:2a53a4c3238c 1474 u16_t
lorcansmith 0:2a53a4c3238c 1475 tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr)
lorcansmith 0:2a53a4c3238c 1476 {
lorcansmith 0:2a53a4c3238c 1477 u16_t mss_s;
lorcansmith 0:2a53a4c3238c 1478 struct netif *outif;
lorcansmith 0:2a53a4c3238c 1479
lorcansmith 0:2a53a4c3238c 1480 outif = ip_route(addr);
lorcansmith 0:2a53a4c3238c 1481 if ((outif != NULL) && (outif->mtu != 0)) {
lorcansmith 0:2a53a4c3238c 1482 mss_s = outif->mtu - IP_HLEN - TCP_HLEN;
lorcansmith 0:2a53a4c3238c 1483 /* RFC 1122, chap 4.2.2.6:
lorcansmith 0:2a53a4c3238c 1484 * Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
lorcansmith 0:2a53a4c3238c 1485 * We correct for TCP options in tcp_write(), and don't support IP options.
lorcansmith 0:2a53a4c3238c 1486 */
lorcansmith 0:2a53a4c3238c 1487 sendmss = LWIP_MIN(sendmss, mss_s);
lorcansmith 0:2a53a4c3238c 1488 }
lorcansmith 0:2a53a4c3238c 1489 return sendmss;
lorcansmith 0:2a53a4c3238c 1490 }
lorcansmith 0:2a53a4c3238c 1491 #endif /* TCP_CALCULATE_EFF_SEND_MSS */
lorcansmith 0:2a53a4c3238c 1492
lorcansmith 0:2a53a4c3238c 1493 const char*
lorcansmith 0:2a53a4c3238c 1494 tcp_debug_state_str(enum tcp_state s)
lorcansmith 0:2a53a4c3238c 1495 {
lorcansmith 0:2a53a4c3238c 1496 return tcp_state_str[s];
lorcansmith 0:2a53a4c3238c 1497 }
lorcansmith 0:2a53a4c3238c 1498
lorcansmith 0:2a53a4c3238c 1499 #if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
lorcansmith 0:2a53a4c3238c 1500 /**
lorcansmith 0:2a53a4c3238c 1501 * Print a tcp header for debugging purposes.
lorcansmith 0:2a53a4c3238c 1502 *
lorcansmith 0:2a53a4c3238c 1503 * @param tcphdr pointer to a struct tcp_hdr
lorcansmith 0:2a53a4c3238c 1504 */
lorcansmith 0:2a53a4c3238c 1505 void
lorcansmith 0:2a53a4c3238c 1506 tcp_debug_print(struct tcp_hdr *tcphdr)
lorcansmith 0:2a53a4c3238c 1507 {
lorcansmith 0:2a53a4c3238c 1508 LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
lorcansmith 0:2a53a4c3238c 1509 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
lorcansmith 0:2a53a4c3238c 1510 LWIP_DEBUGF(TCP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
lorcansmith 0:2a53a4c3238c 1511 ntohs(tcphdr->src), ntohs(tcphdr->dest)));
lorcansmith 0:2a53a4c3238c 1512 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
lorcansmith 0:2a53a4c3238c 1513 LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (seq no)\n",
lorcansmith 0:2a53a4c3238c 1514 ntohl(tcphdr->seqno)));
lorcansmith 0:2a53a4c3238c 1515 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
lorcansmith 0:2a53a4c3238c 1516 LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (ack no)\n",
lorcansmith 0:2a53a4c3238c 1517 ntohl(tcphdr->ackno)));
lorcansmith 0:2a53a4c3238c 1518 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
lorcansmith 0:2a53a4c3238c 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 (",
lorcansmith 0:2a53a4c3238c 1520 TCPH_HDRLEN(tcphdr),
lorcansmith 0:2a53a4c3238c 1521 TCPH_FLAGS(tcphdr) >> 5 & 1,
lorcansmith 0:2a53a4c3238c 1522 TCPH_FLAGS(tcphdr) >> 4 & 1,
lorcansmith 0:2a53a4c3238c 1523 TCPH_FLAGS(tcphdr) >> 3 & 1,
lorcansmith 0:2a53a4c3238c 1524 TCPH_FLAGS(tcphdr) >> 2 & 1,
lorcansmith 0:2a53a4c3238c 1525 TCPH_FLAGS(tcphdr) >> 1 & 1,
lorcansmith 0:2a53a4c3238c 1526 TCPH_FLAGS(tcphdr) & 1,
lorcansmith 0:2a53a4c3238c 1527 ntohs(tcphdr->wnd)));
lorcansmith 0:2a53a4c3238c 1528 tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
lorcansmith 0:2a53a4c3238c 1529 LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
lorcansmith 0:2a53a4c3238c 1530 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
lorcansmith 0:2a53a4c3238c 1531 LWIP_DEBUGF(TCP_DEBUG, ("| 0x%04"X16_F" | %5"U16_F" | (chksum, urgp)\n",
lorcansmith 0:2a53a4c3238c 1532 ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
lorcansmith 0:2a53a4c3238c 1533 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
lorcansmith 0:2a53a4c3238c 1534 }
lorcansmith 0:2a53a4c3238c 1535
lorcansmith 0:2a53a4c3238c 1536 /**
lorcansmith 0:2a53a4c3238c 1537 * Print a tcp state for debugging purposes.
lorcansmith 0:2a53a4c3238c 1538 *
lorcansmith 0:2a53a4c3238c 1539 * @param s enum tcp_state to print
lorcansmith 0:2a53a4c3238c 1540 */
lorcansmith 0:2a53a4c3238c 1541 void
lorcansmith 0:2a53a4c3238c 1542 tcp_debug_print_state(enum tcp_state s)
lorcansmith 0:2a53a4c3238c 1543 {
lorcansmith 0:2a53a4c3238c 1544 LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
lorcansmith 0:2a53a4c3238c 1545 }
lorcansmith 0:2a53a4c3238c 1546
lorcansmith 0:2a53a4c3238c 1547 /**
lorcansmith 0:2a53a4c3238c 1548 * Print tcp flags for debugging purposes.
lorcansmith 0:2a53a4c3238c 1549 *
lorcansmith 0:2a53a4c3238c 1550 * @param flags tcp flags, all active flags are printed
lorcansmith 0:2a53a4c3238c 1551 */
lorcansmith 0:2a53a4c3238c 1552 void
lorcansmith 0:2a53a4c3238c 1553 tcp_debug_print_flags(u8_t flags)
lorcansmith 0:2a53a4c3238c 1554 {
lorcansmith 0:2a53a4c3238c 1555 if (flags & TCP_FIN) {
lorcansmith 0:2a53a4c3238c 1556 LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
lorcansmith 0:2a53a4c3238c 1557 }
lorcansmith 0:2a53a4c3238c 1558 if (flags & TCP_SYN) {
lorcansmith 0:2a53a4c3238c 1559 LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
lorcansmith 0:2a53a4c3238c 1560 }
lorcansmith 0:2a53a4c3238c 1561 if (flags & TCP_RST) {
lorcansmith 0:2a53a4c3238c 1562 LWIP_DEBUGF(TCP_DEBUG, ("RST "));
lorcansmith 0:2a53a4c3238c 1563 }
lorcansmith 0:2a53a4c3238c 1564 if (flags & TCP_PSH) {
lorcansmith 0:2a53a4c3238c 1565 LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
lorcansmith 0:2a53a4c3238c 1566 }
lorcansmith 0:2a53a4c3238c 1567 if (flags & TCP_ACK) {
lorcansmith 0:2a53a4c3238c 1568 LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
lorcansmith 0:2a53a4c3238c 1569 }
lorcansmith 0:2a53a4c3238c 1570 if (flags & TCP_URG) {
lorcansmith 0:2a53a4c3238c 1571 LWIP_DEBUGF(TCP_DEBUG, ("URG "));
lorcansmith 0:2a53a4c3238c 1572 }
lorcansmith 0:2a53a4c3238c 1573 if (flags & TCP_ECE) {
lorcansmith 0:2a53a4c3238c 1574 LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
lorcansmith 0:2a53a4c3238c 1575 }
lorcansmith 0:2a53a4c3238c 1576 if (flags & TCP_CWR) {
lorcansmith 0:2a53a4c3238c 1577 LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
lorcansmith 0:2a53a4c3238c 1578 }
lorcansmith 0:2a53a4c3238c 1579 LWIP_DEBUGF(TCP_DEBUG, ("\n"));
lorcansmith 0:2a53a4c3238c 1580 }
lorcansmith 0:2a53a4c3238c 1581
lorcansmith 0:2a53a4c3238c 1582 /**
lorcansmith 0:2a53a4c3238c 1583 * Print all tcp_pcbs in every list for debugging purposes.
lorcansmith 0:2a53a4c3238c 1584 */
lorcansmith 0:2a53a4c3238c 1585 void
lorcansmith 0:2a53a4c3238c 1586 tcp_debug_print_pcbs(void)
lorcansmith 0:2a53a4c3238c 1587 {
lorcansmith 0:2a53a4c3238c 1588 struct tcp_pcb *pcb;
lorcansmith 0:2a53a4c3238c 1589 LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
lorcansmith 0:2a53a4c3238c 1590 for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
lorcansmith 0:2a53a4c3238c 1591 LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
lorcansmith 0:2a53a4c3238c 1592 pcb->local_port, pcb->remote_port,
lorcansmith 0:2a53a4c3238c 1593 pcb->snd_nxt, pcb->rcv_nxt));
lorcansmith 0:2a53a4c3238c 1594 tcp_debug_print_state(pcb->state);
lorcansmith 0:2a53a4c3238c 1595 }
lorcansmith 0:2a53a4c3238c 1596 LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
lorcansmith 0:2a53a4c3238c 1597 for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
lorcansmith 0:2a53a4c3238c 1598 LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
lorcansmith 0:2a53a4c3238c 1599 pcb->local_port, pcb->remote_port,
lorcansmith 0:2a53a4c3238c 1600 pcb->snd_nxt, pcb->rcv_nxt));
lorcansmith 0:2a53a4c3238c 1601 tcp_debug_print_state(pcb->state);
lorcansmith 0:2a53a4c3238c 1602 }
lorcansmith 0:2a53a4c3238c 1603 LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
lorcansmith 0:2a53a4c3238c 1604 for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
lorcansmith 0:2a53a4c3238c 1605 LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
lorcansmith 0:2a53a4c3238c 1606 pcb->local_port, pcb->remote_port,
lorcansmith 0:2a53a4c3238c 1607 pcb->snd_nxt, pcb->rcv_nxt));
lorcansmith 0:2a53a4c3238c 1608 tcp_debug_print_state(pcb->state);
lorcansmith 0:2a53a4c3238c 1609 }
lorcansmith 0:2a53a4c3238c 1610 }
lorcansmith 0:2a53a4c3238c 1611
lorcansmith 0:2a53a4c3238c 1612 /**
lorcansmith 0:2a53a4c3238c 1613 * Check state consistency of the tcp_pcb lists.
lorcansmith 0:2a53a4c3238c 1614 */
lorcansmith 0:2a53a4c3238c 1615 s16_t
lorcansmith 0:2a53a4c3238c 1616 tcp_pcbs_sane(void)
lorcansmith 0:2a53a4c3238c 1617 {
lorcansmith 0:2a53a4c3238c 1618 struct tcp_pcb *pcb;
lorcansmith 0:2a53a4c3238c 1619 for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
lorcansmith 0:2a53a4c3238c 1620 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
lorcansmith 0:2a53a4c3238c 1621 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
lorcansmith 0:2a53a4c3238c 1622 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
lorcansmith 0:2a53a4c3238c 1623 }
lorcansmith 0:2a53a4c3238c 1624 for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
lorcansmith 0:2a53a4c3238c 1625 LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
lorcansmith 0:2a53a4c3238c 1626 }
lorcansmith 0:2a53a4c3238c 1627 return 1;
lorcansmith 0:2a53a4c3238c 1628 }
lorcansmith 0:2a53a4c3238c 1629 #endif /* TCP_DEBUG */
lorcansmith 0:2a53a4c3238c 1630
lorcansmith 0:2a53a4c3238c 1631 #endif /* LWIP_TCP */