Adam Green / EthernetInterface

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lwip/core/tcp.c@1:eadc868c2acf, 2013-10-26 (annotated)

Committer:
AdamGreen
Date:
Sat Oct 26 08:51:36 2013 +0000
Revision:
1:eadc868c2acf
Parent:
0:3b00827bb0b7 
Fix TCP checksum bug and stranded large TCP segments.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AdamGreen 0:3b00827bb0b7 1 /**
AdamGreen 0:3b00827bb0b7 2 * @file
AdamGreen 0:3b00827bb0b7 3 * Transmission Control Protocol for IP
AdamGreen 0:3b00827bb0b7 4 *
AdamGreen 0:3b00827bb0b7 5 * This file contains common functions for the TCP implementation, such as functinos
AdamGreen 0:3b00827bb0b7 6 * for manipulating the data structures and the TCP timer functions. TCP functions
AdamGreen 0:3b00827bb0b7 7 * related to input and output is found in tcp_in.c and tcp_out.c respectively.
AdamGreen 0:3b00827bb0b7 8 *
AdamGreen 0:3b00827bb0b7 9 */
AdamGreen 0:3b00827bb0b7 10
AdamGreen 0:3b00827bb0b7 11 /*
AdamGreen 0:3b00827bb0b7 12 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
AdamGreen 0:3b00827bb0b7 13 * All rights reserved.
AdamGreen 0:3b00827bb0b7 14 *
AdamGreen 0:3b00827bb0b7 15 * Redistribution and use in source and binary forms, with or without modification,
AdamGreen 0:3b00827bb0b7 16 * are permitted provided that the following conditions are met:
AdamGreen 0:3b00827bb0b7 17 *
AdamGreen 0:3b00827bb0b7 18 * 1. Redistributions of source code must retain the above copyright notice,
AdamGreen 0:3b00827bb0b7 19 * this list of conditions and the following disclaimer.
AdamGreen 0:3b00827bb0b7 20 * 2. Redistributions in binary form must reproduce the above copyright notice,
AdamGreen 0:3b00827bb0b7 21 * this list of conditions and the following disclaimer in the documentation
AdamGreen 0:3b00827bb0b7 22 * and/or other materials provided with the distribution.
AdamGreen 0:3b00827bb0b7 23 * 3. The name of the author may not be used to endorse or promote products
AdamGreen 0:3b00827bb0b7 24 * derived from this software without specific prior written permission.
AdamGreen 0:3b00827bb0b7 25 *
AdamGreen 0:3b00827bb0b7 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
AdamGreen 0:3b00827bb0b7 27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
AdamGreen 0:3b00827bb0b7 28 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
AdamGreen 0:3b00827bb0b7 29 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
AdamGreen 0:3b00827bb0b7 30 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
AdamGreen 0:3b00827bb0b7 31 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
AdamGreen 0:3b00827bb0b7 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
AdamGreen 0:3b00827bb0b7 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
AdamGreen 0:3b00827bb0b7 34 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
AdamGreen 0:3b00827bb0b7 35 * OF SUCH DAMAGE.
AdamGreen 0:3b00827bb0b7 36 *
AdamGreen 0:3b00827bb0b7 37 * This file is part of the lwIP TCP/IP stack.
AdamGreen 0:3b00827bb0b7 38 *
AdamGreen 0:3b00827bb0b7 39 * Author: Adam Dunkels <adam@sics.se>
AdamGreen 0:3b00827bb0b7 40 *
AdamGreen 0:3b00827bb0b7 41 */
AdamGreen 0:3b00827bb0b7 42
AdamGreen 0:3b00827bb0b7 43 #include "lwip/opt.h"
AdamGreen 0:3b00827bb0b7 44
AdamGreen 0:3b00827bb0b7 45 #if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
AdamGreen 0:3b00827bb0b7 46
AdamGreen 0:3b00827bb0b7 47 #include "lwip/def.h"
AdamGreen 0:3b00827bb0b7 48 #include "lwip/mem.h"
AdamGreen 0:3b00827bb0b7 49 #include "lwip/memp.h"
AdamGreen 0:3b00827bb0b7 50 #include "lwip/snmp.h"
AdamGreen 0:3b00827bb0b7 51 #include "lwip/tcp.h"
AdamGreen 0:3b00827bb0b7 52 #include "lwip/tcp_impl.h"
AdamGreen 0:3b00827bb0b7 53 #include "lwip/debug.h"
AdamGreen 0:3b00827bb0b7 54 #include "lwip/stats.h"
AdamGreen 0:3b00827bb0b7 55
AdamGreen 0:3b00827bb0b7 56 #include <string.h>
AdamGreen 0:3b00827bb0b7 57
AdamGreen 0:3b00827bb0b7 58 const char * const tcp_state_str[] = {
AdamGreen 0:3b00827bb0b7 59 "CLOSED",
AdamGreen 0:3b00827bb0b7 60 "LISTEN",
AdamGreen 0:3b00827bb0b7 61 "SYN_SENT",
AdamGreen 0:3b00827bb0b7 62 "SYN_RCVD",
AdamGreen 0:3b00827bb0b7 63 "ESTABLISHED",
AdamGreen 0:3b00827bb0b7 64 "FIN_WAIT_1",
AdamGreen 0:3b00827bb0b7 65 "FIN_WAIT_2",
AdamGreen 0:3b00827bb0b7 66 "CLOSE_WAIT",
AdamGreen 0:3b00827bb0b7 67 "CLOSING",
AdamGreen 0:3b00827bb0b7 68 "LAST_ACK",
AdamGreen 0:3b00827bb0b7 69 "TIME_WAIT"
AdamGreen 0:3b00827bb0b7 70 };
AdamGreen 0:3b00827bb0b7 71
AdamGreen 0:3b00827bb0b7 72 /* Incremented every coarse grained timer shot (typically every 500 ms). */
AdamGreen 0:3b00827bb0b7 73 u32_t tcp_ticks;
AdamGreen 0:3b00827bb0b7 74 const u8_t tcp_backoff[13] =
AdamGreen 0:3b00827bb0b7 75 { 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
AdamGreen 0:3b00827bb0b7 76 /* Times per slowtmr hits */
AdamGreen 0:3b00827bb0b7 77 const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
AdamGreen 0:3b00827bb0b7 78
AdamGreen 0:3b00827bb0b7 79 /* The TCP PCB lists. */
AdamGreen 0:3b00827bb0b7 80
AdamGreen 0:3b00827bb0b7 81 /** List of all TCP PCBs bound but not yet (connected || listening) */
AdamGreen 0:3b00827bb0b7 82 struct tcp_pcb *tcp_bound_pcbs;
AdamGreen 0:3b00827bb0b7 83 /** List of all TCP PCBs in LISTEN state */
AdamGreen 0:3b00827bb0b7 84 union tcp_listen_pcbs_t tcp_listen_pcbs;
AdamGreen 0:3b00827bb0b7 85 /** List of all TCP PCBs that are in a state in which
AdamGreen 0:3b00827bb0b7 86 * they accept or send data. */
AdamGreen 0:3b00827bb0b7 87 struct tcp_pcb *tcp_active_pcbs;
AdamGreen 0:3b00827bb0b7 88 /** List of all TCP PCBs in TIME-WAIT state */
AdamGreen 0:3b00827bb0b7 89 struct tcp_pcb *tcp_tw_pcbs;
AdamGreen 0:3b00827bb0b7 90
AdamGreen 0:3b00827bb0b7 91 #define NUM_TCP_PCB_LISTS 4
AdamGreen 0:3b00827bb0b7 92 #define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
AdamGreen 0:3b00827bb0b7 93 /** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
AdamGreen 0:3b00827bb0b7 94 struct tcp_pcb ** const tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
AdamGreen 0:3b00827bb0b7 95 &tcp_active_pcbs, &tcp_tw_pcbs};
AdamGreen 0:3b00827bb0b7 96
AdamGreen 0:3b00827bb0b7 97 /** Only used for temporary storage. */
AdamGreen 0:3b00827bb0b7 98 struct tcp_pcb *tcp_tmp_pcb;
AdamGreen 0:3b00827bb0b7 99
AdamGreen 0:3b00827bb0b7 100 /** Timer counter to handle calling slow-timer from tcp_tmr() */
AdamGreen 0:3b00827bb0b7 101 static u8_t tcp_timer;
AdamGreen 0:3b00827bb0b7 102 static u16_t tcp_new_port(void);
AdamGreen 0:3b00827bb0b7 103
AdamGreen 0:3b00827bb0b7 104 /**
AdamGreen 0:3b00827bb0b7 105 * Called periodically to dispatch TCP timers.
AdamGreen 0:3b00827bb0b7 106 *
AdamGreen 0:3b00827bb0b7 107 */
AdamGreen 0:3b00827bb0b7 108 void
AdamGreen 0:3b00827bb0b7 109 tcp_tmr(void)
AdamGreen 0:3b00827bb0b7 110 {
AdamGreen 0:3b00827bb0b7 111 /* Call tcp_fasttmr() every 250 ms */
AdamGreen 0:3b00827bb0b7 112 tcp_fasttmr();
AdamGreen 0:3b00827bb0b7 113
AdamGreen 0:3b00827bb0b7 114 if (++tcp_timer & 1) {
AdamGreen 0:3b00827bb0b7 115 /* Call tcp_tmr() every 500 ms, i.e., every other timer
AdamGreen 0:3b00827bb0b7 116 tcp_tmr() is called. */
AdamGreen 0:3b00827bb0b7 117 tcp_slowtmr();
AdamGreen 0:3b00827bb0b7 118 }
AdamGreen 0:3b00827bb0b7 119 }
AdamGreen 0:3b00827bb0b7 120
AdamGreen 0:3b00827bb0b7 121 /**
AdamGreen 0:3b00827bb0b7 122 * Closes the TX side of a connection held by the PCB.
AdamGreen 0:3b00827bb0b7 123 * For tcp_close(), a RST is sent if the application didn't receive all data
AdamGreen 0:3b00827bb0b7 124 * (tcp_recved() not called for all data passed to recv callback).
AdamGreen 0:3b00827bb0b7 125 *
AdamGreen 0:3b00827bb0b7 126 * Listening pcbs are freed and may not be referenced any more.
AdamGreen 0:3b00827bb0b7 127 * Connection pcbs are freed if not yet connected and may not be referenced
AdamGreen 0:3b00827bb0b7 128 * any more. If a connection is established (at least SYN received or in
AdamGreen 0:3b00827bb0b7 129 * a closing state), the connection is closed, and put in a closing state.
AdamGreen 0:3b00827bb0b7 130 * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
AdamGreen 0:3b00827bb0b7 131 * unsafe to reference it.
AdamGreen 0:3b00827bb0b7 132 *
AdamGreen 0:3b00827bb0b7 133 * @param pcb the tcp_pcb to close
AdamGreen 0:3b00827bb0b7 134 * @return ERR_OK if connection has been closed
AdamGreen 0:3b00827bb0b7 135 * another err_t if closing failed and pcb is not freed
AdamGreen 0:3b00827bb0b7 136 */
AdamGreen 0:3b00827bb0b7 137 static err_t
AdamGreen 0:3b00827bb0b7 138 tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
AdamGreen 0:3b00827bb0b7 139 {
AdamGreen 0:3b00827bb0b7 140 err_t err;
AdamGreen 0:3b00827bb0b7 141
AdamGreen 0:3b00827bb0b7 142 if (rst_on_unacked_data && (pcb->state != LISTEN)) {
AdamGreen 0:3b00827bb0b7 143 if ((pcb->refused_data != NULL) || (pcb->rcv_wnd != TCP_WND)) {
AdamGreen 0:3b00827bb0b7 144 /* Not all data received by application, send RST to tell the remote
AdamGreen 0:3b00827bb0b7 145 side about this. */
AdamGreen 0:3b00827bb0b7 146 LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
AdamGreen 0:3b00827bb0b7 147
AdamGreen 0:3b00827bb0b7 148 /* don't call tcp_abort here: we must not deallocate the pcb since
AdamGreen 0:3b00827bb0b7 149 that might not be expected when calling tcp_close */
AdamGreen 0:3b00827bb0b7 150 tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
AdamGreen 0:3b00827bb0b7 151 pcb->local_port, pcb->remote_port);
AdamGreen 0:3b00827bb0b7 152
AdamGreen 0:3b00827bb0b7 153 tcp_pcb_purge(pcb);
AdamGreen 0:3b00827bb0b7 154
AdamGreen 0:3b00827bb0b7 155 /* TODO: to which state do we move now? */
AdamGreen 0:3b00827bb0b7 156
AdamGreen 0:3b00827bb0b7 157 /* move to TIME_WAIT since we close actively */
AdamGreen 0:3b00827bb0b7 158 TCP_RMV(&tcp_active_pcbs, pcb);
AdamGreen 0:3b00827bb0b7 159 pcb->state = TIME_WAIT;
AdamGreen 0:3b00827bb0b7 160 TCP_REG(&tcp_tw_pcbs, pcb);
AdamGreen 0:3b00827bb0b7 161
AdamGreen 0:3b00827bb0b7 162 return ERR_OK;
AdamGreen 0:3b00827bb0b7 163 }
AdamGreen 0:3b00827bb0b7 164 }
AdamGreen 0:3b00827bb0b7 165
AdamGreen 0:3b00827bb0b7 166 switch (pcb->state) {
AdamGreen 0:3b00827bb0b7 167 case CLOSED:
AdamGreen 0:3b00827bb0b7 168 /* Closing a pcb in the CLOSED state might seem erroneous,
AdamGreen 0:3b00827bb0b7 169 * however, it is in this state once allocated and as yet unused
AdamGreen 0:3b00827bb0b7 170 * and the user needs some way to free it should the need arise.
AdamGreen 0:3b00827bb0b7 171 * Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
AdamGreen 0:3b00827bb0b7 172 * or for a pcb that has been used and then entered the CLOSED state
AdamGreen 0:3b00827bb0b7 173 * is erroneous, but this should never happen as the pcb has in those cases
AdamGreen 0:3b00827bb0b7 174 * been freed, and so any remaining handles are bogus. */
AdamGreen 0:3b00827bb0b7 175 err = ERR_OK;
AdamGreen 0:3b00827bb0b7 176 if (pcb->local_port != 0) {
AdamGreen 0:3b00827bb0b7 177 TCP_RMV(&tcp_bound_pcbs, pcb);
AdamGreen 0:3b00827bb0b7 178 }
AdamGreen 0:3b00827bb0b7 179 memp_free(MEMP_TCP_PCB, pcb);
AdamGreen 0:3b00827bb0b7 180 pcb = NULL;
AdamGreen 0:3b00827bb0b7 181 break;
AdamGreen 0:3b00827bb0b7 182 case LISTEN:
AdamGreen 0:3b00827bb0b7 183 err = ERR_OK;
AdamGreen 0:3b00827bb0b7 184 tcp_pcb_remove(&tcp_listen_pcbs.pcbs, pcb);
AdamGreen 0:3b00827bb0b7 185 memp_free(MEMP_TCP_PCB_LISTEN, pcb);
AdamGreen 0:3b00827bb0b7 186 pcb = NULL;
AdamGreen 0:3b00827bb0b7 187 break;
AdamGreen 0:3b00827bb0b7 188 case SYN_SENT:
AdamGreen 0:3b00827bb0b7 189 err = ERR_OK;
AdamGreen 0:3b00827bb0b7 190 tcp_pcb_remove(&tcp_active_pcbs, pcb);
AdamGreen 0:3b00827bb0b7 191 memp_free(MEMP_TCP_PCB, pcb);
AdamGreen 0:3b00827bb0b7 192 pcb = NULL;
AdamGreen 0:3b00827bb0b7 193 snmp_inc_tcpattemptfails();
AdamGreen 0:3b00827bb0b7 194 break;
AdamGreen 0:3b00827bb0b7 195 case SYN_RCVD:
AdamGreen 0:3b00827bb0b7 196 err = tcp_send_fin(pcb);
AdamGreen 0:3b00827bb0b7 197 if (err == ERR_OK) {
AdamGreen 0:3b00827bb0b7 198 snmp_inc_tcpattemptfails();
AdamGreen 0:3b00827bb0b7 199 pcb->state = FIN_WAIT_1;
AdamGreen 0:3b00827bb0b7 200 }
AdamGreen 0:3b00827bb0b7 201 break;
AdamGreen 0:3b00827bb0b7 202 case ESTABLISHED:
AdamGreen 0:3b00827bb0b7 203 err = tcp_send_fin(pcb);
AdamGreen 0:3b00827bb0b7 204 if (err == ERR_OK) {
AdamGreen 0:3b00827bb0b7 205 snmp_inc_tcpestabresets();
AdamGreen 0:3b00827bb0b7 206 pcb->state = FIN_WAIT_1;
AdamGreen 0:3b00827bb0b7 207 }
AdamGreen 0:3b00827bb0b7 208 break;
AdamGreen 0:3b00827bb0b7 209 case CLOSE_WAIT:
AdamGreen 0:3b00827bb0b7 210 err = tcp_send_fin(pcb);
AdamGreen 0:3b00827bb0b7 211 if (err == ERR_OK) {
AdamGreen 0:3b00827bb0b7 212 snmp_inc_tcpestabresets();
AdamGreen 0:3b00827bb0b7 213 pcb->state = LAST_ACK;
AdamGreen 0:3b00827bb0b7 214 }
AdamGreen 0:3b00827bb0b7 215 break;
AdamGreen 0:3b00827bb0b7 216 default:
AdamGreen 0:3b00827bb0b7 217 /* Has already been closed, do nothing. */
AdamGreen 0:3b00827bb0b7 218 err = ERR_OK;
AdamGreen 0:3b00827bb0b7 219 pcb = NULL;
AdamGreen 0:3b00827bb0b7 220 break;
AdamGreen 0:3b00827bb0b7 221 }
AdamGreen 0:3b00827bb0b7 222
AdamGreen 0:3b00827bb0b7 223 if (pcb != NULL && err == ERR_OK) {
AdamGreen 0:3b00827bb0b7 224 /* To ensure all data has been sent when tcp_close returns, we have
AdamGreen 0:3b00827bb0b7 225 to make sure tcp_output doesn't fail.
AdamGreen 0:3b00827bb0b7 226 Since we don't really have to ensure all data has been sent when tcp_close
AdamGreen 0:3b00827bb0b7 227 returns (unsent data is sent from tcp timer functions, also), we don't care
AdamGreen 0:3b00827bb0b7 228 for the return value of tcp_output for now. */
AdamGreen 0:3b00827bb0b7 229 /* @todo: When implementing SO_LINGER, this must be changed somehow:
AdamGreen 0:3b00827bb0b7 230 If SOF_LINGER is set, the data should be sent and acked before close returns.
AdamGreen 0:3b00827bb0b7 231 This can only be valid for sequential APIs, not for the raw API. */
AdamGreen 0:3b00827bb0b7 232 tcp_output(pcb);
AdamGreen 0:3b00827bb0b7 233 }
AdamGreen 0:3b00827bb0b7 234 return err;
AdamGreen 0:3b00827bb0b7 235 }
AdamGreen 0:3b00827bb0b7 236
AdamGreen 0:3b00827bb0b7 237 /**
AdamGreen 0:3b00827bb0b7 238 * Closes the connection held by the PCB.
AdamGreen 0:3b00827bb0b7 239 *
AdamGreen 0:3b00827bb0b7 240 * Listening pcbs are freed and may not be referenced any more.
AdamGreen 0:3b00827bb0b7 241 * Connection pcbs are freed if not yet connected and may not be referenced
AdamGreen 0:3b00827bb0b7 242 * any more. If a connection is established (at least SYN received or in
AdamGreen 0:3b00827bb0b7 243 * a closing state), the connection is closed, and put in a closing state.
AdamGreen 0:3b00827bb0b7 244 * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
AdamGreen 0:3b00827bb0b7 245 * unsafe to reference it (unless an error is returned).
AdamGreen 0:3b00827bb0b7 246 *
AdamGreen 0:3b00827bb0b7 247 * @param pcb the tcp_pcb to close
AdamGreen 0:3b00827bb0b7 248 * @return ERR_OK if connection has been closed
AdamGreen 0:3b00827bb0b7 249 * another err_t if closing failed and pcb is not freed
AdamGreen 0:3b00827bb0b7 250 */
AdamGreen 0:3b00827bb0b7 251 err_t
AdamGreen 0:3b00827bb0b7 252 tcp_close(struct tcp_pcb *pcb)
AdamGreen 0:3b00827bb0b7 253 {
AdamGreen 0:3b00827bb0b7 254 #if TCP_DEBUG
AdamGreen 0:3b00827bb0b7 255 LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
AdamGreen 0:3b00827bb0b7 256 tcp_debug_print_state(pcb->state);
AdamGreen 0:3b00827bb0b7 257 #endif /* TCP_DEBUG */
AdamGreen 0:3b00827bb0b7 258
AdamGreen 0:3b00827bb0b7 259 if (pcb->state != LISTEN) {
AdamGreen 0:3b00827bb0b7 260 /* Set a flag not to receive any more data... */
AdamGreen 0:3b00827bb0b7 261 pcb->flags |= TF_RXCLOSED;
AdamGreen 0:3b00827bb0b7 262 }
AdamGreen 0:3b00827bb0b7 263 /* ... and close */
AdamGreen 0:3b00827bb0b7 264 return tcp_close_shutdown(pcb, 1);
AdamGreen 0:3b00827bb0b7 265 }
AdamGreen 0:3b00827bb0b7 266
AdamGreen 0:3b00827bb0b7 267 /**
AdamGreen 0:3b00827bb0b7 268 * Causes all or part of a full-duplex connection of this PCB to be shut down.
AdamGreen 0:3b00827bb0b7 269 * This doesn't deallocate the PCB!
AdamGreen 0:3b00827bb0b7 270 *
AdamGreen 0:3b00827bb0b7 271 * @param pcb PCB to shutdown
AdamGreen 0:3b00827bb0b7 272 * @param shut_rx shut down receive side if this is != 0
AdamGreen 0:3b00827bb0b7 273 * @param shut_tx shut down send side if this is != 0
AdamGreen 0:3b00827bb0b7 274 * @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
AdamGreen 0:3b00827bb0b7 275 * another err_t on error.
AdamGreen 0:3b00827bb0b7 276 */
AdamGreen 0:3b00827bb0b7 277 err_t
AdamGreen 0:3b00827bb0b7 278 tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
AdamGreen 0:3b00827bb0b7 279 {
AdamGreen 0:3b00827bb0b7 280 if (pcb->state == LISTEN) {
AdamGreen 0:3b00827bb0b7 281 return ERR_CONN;
AdamGreen 0:3b00827bb0b7 282 }
AdamGreen 0:3b00827bb0b7 283 if (shut_rx) {
AdamGreen 0:3b00827bb0b7 284 /* shut down the receive side: free buffered data... */
AdamGreen 0:3b00827bb0b7 285 if (pcb->refused_data != NULL) {
AdamGreen 0:3b00827bb0b7 286 pbuf_free(pcb->refused_data);
AdamGreen 0:3b00827bb0b7 287 pcb->refused_data = NULL;
AdamGreen 0:3b00827bb0b7 288 }
AdamGreen 0:3b00827bb0b7 289 /* ... and set a flag not to receive any more data */
AdamGreen 0:3b00827bb0b7 290 pcb->flags |= TF_RXCLOSED;
AdamGreen 0:3b00827bb0b7 291 }
AdamGreen 0:3b00827bb0b7 292 if (shut_tx) {
AdamGreen 0:3b00827bb0b7 293 /* This can't happen twice since if it succeeds, the pcb's state is changed.
AdamGreen 0:3b00827bb0b7 294 Only close in these states as the others directly deallocate the PCB */
AdamGreen 0:3b00827bb0b7 295 switch (pcb->state) {
AdamGreen 0:3b00827bb0b7 296 case SYN_RCVD:
AdamGreen 0:3b00827bb0b7 297 case ESTABLISHED:
AdamGreen 0:3b00827bb0b7 298 case CLOSE_WAIT:
AdamGreen 0:3b00827bb0b7 299 return tcp_close_shutdown(pcb, 0);
AdamGreen 0:3b00827bb0b7 300 default:
AdamGreen 0:3b00827bb0b7 301 /* don't shut down other states */
AdamGreen 0:3b00827bb0b7 302 break;
AdamGreen 0:3b00827bb0b7 303 }
AdamGreen 0:3b00827bb0b7 304 }
AdamGreen 0:3b00827bb0b7 305 /* @todo: return another err_t if not in correct state or already shut? */
AdamGreen 0:3b00827bb0b7 306 return ERR_OK;
AdamGreen 0:3b00827bb0b7 307 }
AdamGreen 0:3b00827bb0b7 308
AdamGreen 0:3b00827bb0b7 309 /**
AdamGreen 0:3b00827bb0b7 310 * Abandons a connection and optionally sends a RST to the remote
AdamGreen 0:3b00827bb0b7 311 * host. Deletes the local protocol control block. This is done when
AdamGreen 0:3b00827bb0b7 312 * a connection is killed because of shortage of memory.
AdamGreen 0:3b00827bb0b7 313 *
AdamGreen 0:3b00827bb0b7 314 * @param pcb the tcp_pcb to abort
AdamGreen 0:3b00827bb0b7 315 * @param reset boolean to indicate whether a reset should be sent
AdamGreen 0:3b00827bb0b7 316 */
AdamGreen 0:3b00827bb0b7 317 void
AdamGreen 0:3b00827bb0b7 318 tcp_abandon(struct tcp_pcb *pcb, int reset)
AdamGreen 0:3b00827bb0b7 319 {
AdamGreen 0:3b00827bb0b7 320 u32_t seqno, ackno;
AdamGreen 0:3b00827bb0b7 321 u16_t remote_port, local_port;
AdamGreen 0:3b00827bb0b7 322 ip_addr_t remote_ip, local_ip;
AdamGreen 0:3b00827bb0b7 323 #if LWIP_CALLBACK_API
AdamGreen 0:3b00827bb0b7 324 tcp_err_fn errf;
AdamGreen 0:3b00827bb0b7 325 #endif /* LWIP_CALLBACK_API */
AdamGreen 0:3b00827bb0b7 326 void *errf_arg;
AdamGreen 0:3b00827bb0b7 327
AdamGreen 0:3b00827bb0b7 328 /* pcb->state LISTEN not allowed here */
AdamGreen 0:3b00827bb0b7 329 LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
AdamGreen 0:3b00827bb0b7 330 pcb->state != LISTEN);
AdamGreen 0:3b00827bb0b7 331 /* Figure out on which TCP PCB list we are, and remove us. If we
AdamGreen 0:3b00827bb0b7 332 are in an active state, call the receive function associated with
AdamGreen 0:3b00827bb0b7 333 the PCB with a NULL argument, and send an RST to the remote end. */
AdamGreen 0:3b00827bb0b7 334 if (pcb->state == TIME_WAIT) {
AdamGreen 0:3b00827bb0b7 335 tcp_pcb_remove(&tcp_tw_pcbs, pcb);
AdamGreen 0:3b00827bb0b7 336 memp_free(MEMP_TCP_PCB, pcb);
AdamGreen 0:3b00827bb0b7 337 } else {
AdamGreen 0:3b00827bb0b7 338 seqno = pcb->snd_nxt;
AdamGreen 0:3b00827bb0b7 339 ackno = pcb->rcv_nxt;
AdamGreen 0:3b00827bb0b7 340 ip_addr_copy(local_ip, pcb->local_ip);
AdamGreen 0:3b00827bb0b7 341 ip_addr_copy(remote_ip, pcb->remote_ip);
AdamGreen 0:3b00827bb0b7 342 local_port = pcb->local_port;
AdamGreen 0:3b00827bb0b7 343 remote_port = pcb->remote_port;
AdamGreen 0:3b00827bb0b7 344 #if LWIP_CALLBACK_API
AdamGreen 0:3b00827bb0b7 345 errf = pcb->errf;
AdamGreen 0:3b00827bb0b7 346 #endif /* LWIP_CALLBACK_API */
AdamGreen 0:3b00827bb0b7 347 errf_arg = pcb->callback_arg;
AdamGreen 0:3b00827bb0b7 348 tcp_pcb_remove(&tcp_active_pcbs, pcb);
AdamGreen 0:3b00827bb0b7 349 if (pcb->unacked != NULL) {
AdamGreen 0:3b00827bb0b7 350 tcp_segs_free(pcb->unacked);
AdamGreen 0:3b00827bb0b7 351 }
AdamGreen 0:3b00827bb0b7 352 if (pcb->unsent != NULL) {
AdamGreen 0:3b00827bb0b7 353 tcp_segs_free(pcb->unsent);
AdamGreen 0:3b00827bb0b7 354 }
AdamGreen 0:3b00827bb0b7 355 #if TCP_QUEUE_OOSEQ
AdamGreen 0:3b00827bb0b7 356 if (pcb->ooseq != NULL) {
AdamGreen 0:3b00827bb0b7 357 tcp_segs_free(pcb->ooseq);
AdamGreen 0:3b00827bb0b7 358 }
AdamGreen 0:3b00827bb0b7 359 #endif /* TCP_QUEUE_OOSEQ */
AdamGreen 0:3b00827bb0b7 360 memp_free(MEMP_TCP_PCB, pcb);
AdamGreen 0:3b00827bb0b7 361 TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
AdamGreen 0:3b00827bb0b7 362 if (reset) {
AdamGreen 0:3b00827bb0b7 363 LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
AdamGreen 0:3b00827bb0b7 364 tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port);
AdamGreen 0:3b00827bb0b7 365 }
AdamGreen 0:3b00827bb0b7 366 }
AdamGreen 0:3b00827bb0b7 367 }
AdamGreen 0:3b00827bb0b7 368
AdamGreen 0:3b00827bb0b7 369 /**
AdamGreen 0:3b00827bb0b7 370 * Aborts the connection by sending a RST (reset) segment to the remote
AdamGreen 0:3b00827bb0b7 371 * host. The pcb is deallocated. This function never fails.
AdamGreen 0:3b00827bb0b7 372 *
AdamGreen 0:3b00827bb0b7 373 * ATTENTION: When calling this from one of the TCP callbacks, make
AdamGreen 0:3b00827bb0b7 374 * sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
AdamGreen 0:3b00827bb0b7 375 * or you will risk accessing deallocated memory or memory leaks!
AdamGreen 0:3b00827bb0b7 376 *
AdamGreen 0:3b00827bb0b7 377 * @param pcb the tcp pcb to abort
AdamGreen 0:3b00827bb0b7 378 */
AdamGreen 0:3b00827bb0b7 379 void
AdamGreen 0:3b00827bb0b7 380 tcp_abort(struct tcp_pcb *pcb)
AdamGreen 0:3b00827bb0b7 381 {
AdamGreen 0:3b00827bb0b7 382 tcp_abandon(pcb, 1);
AdamGreen 0:3b00827bb0b7 383 }
AdamGreen 0:3b00827bb0b7 384
AdamGreen 0:3b00827bb0b7 385 /**
AdamGreen 0:3b00827bb0b7 386 * Binds the connection to a local portnumber and IP address. If the
AdamGreen 0:3b00827bb0b7 387 * IP address is not given (i.e., ipaddr == NULL), the IP address of
AdamGreen 0:3b00827bb0b7 388 * the outgoing network interface is used instead.
AdamGreen 0:3b00827bb0b7 389 *
AdamGreen 0:3b00827bb0b7 390 * @param pcb the tcp_pcb to bind (no check is done whether this pcb is
AdamGreen 0:3b00827bb0b7 391 * already bound!)
AdamGreen 0:3b00827bb0b7 392 * @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
AdamGreen 0:3b00827bb0b7 393 * to any local address
AdamGreen 0:3b00827bb0b7 394 * @param port the local port to bind to
AdamGreen 0:3b00827bb0b7 395 * @return ERR_USE if the port is already in use
AdamGreen 0:3b00827bb0b7 396 * ERR_VAL if bind failed because the PCB is not in a valid state
AdamGreen 0:3b00827bb0b7 397 * ERR_OK if bound
AdamGreen 0:3b00827bb0b7 398 */
AdamGreen 0:3b00827bb0b7 399 err_t
AdamGreen 0:3b00827bb0b7 400 tcp_bind(struct tcp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
AdamGreen 0:3b00827bb0b7 401 {
AdamGreen 0:3b00827bb0b7 402 int i;
AdamGreen 0:3b00827bb0b7 403 int max_pcb_list = NUM_TCP_PCB_LISTS;
AdamGreen 0:3b00827bb0b7 404 struct tcp_pcb *cpcb;
AdamGreen 0:3b00827bb0b7 405
AdamGreen 0:3b00827bb0b7 406 LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_VAL);
AdamGreen 0:3b00827bb0b7 407
AdamGreen 0:3b00827bb0b7 408 #if SO_REUSE
AdamGreen 0:3b00827bb0b7 409 /* Unless the REUSEADDR flag is set,
AdamGreen 0:3b00827bb0b7 410 we have to check the pcbs in TIME-WAIT state, also.
AdamGreen 0:3b00827bb0b7 411 We do not dump TIME_WAIT pcb's; they can still be matched by incoming
AdamGreen 0:3b00827bb0b7 412 packets using both local and remote IP addresses and ports to distinguish.
AdamGreen 0:3b00827bb0b7 413 */
AdamGreen 0:3b00827bb0b7 414 if ((pcb->so_options & SOF_REUSEADDR) != 0) {
AdamGreen 0:3b00827bb0b7 415 max_pcb_list = NUM_TCP_PCB_LISTS_NO_TIME_WAIT;
AdamGreen 0:3b00827bb0b7 416 }
AdamGreen 0:3b00827bb0b7 417 #endif /* SO_REUSE */
AdamGreen 0:3b00827bb0b7 418
AdamGreen 0:3b00827bb0b7 419 if (port == 0) {
AdamGreen 0:3b00827bb0b7 420 port = tcp_new_port();
AdamGreen 0:3b00827bb0b7 421 }
AdamGreen 0:3b00827bb0b7 422
AdamGreen 0:3b00827bb0b7 423 /* Check if the address already is in use (on all lists) */
AdamGreen 0:3b00827bb0b7 424 for (i = 0; i < max_pcb_list; i++) {
AdamGreen 0:3b00827bb0b7 425 for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
AdamGreen 0:3b00827bb0b7 426 if (cpcb->local_port == port) {
AdamGreen 0:3b00827bb0b7 427 #if SO_REUSE
AdamGreen 0:3b00827bb0b7 428 /* Omit checking for the same port if both pcbs have REUSEADDR set.
AdamGreen 0:3b00827bb0b7 429 For SO_REUSEADDR, the duplicate-check for a 5-tuple is done in
AdamGreen 0:3b00827bb0b7 430 tcp_connect. */
AdamGreen 0:3b00827bb0b7 431 if (((pcb->so_options & SOF_REUSEADDR) == 0) ||
AdamGreen 0:3b00827bb0b7 432 ((cpcb->so_options & SOF_REUSEADDR) == 0))
AdamGreen 0:3b00827bb0b7 433 #endif /* SO_REUSE */
AdamGreen 0:3b00827bb0b7 434 {
AdamGreen 0:3b00827bb0b7 435 if (ip_addr_isany(&(cpcb->local_ip)) ||
AdamGreen 0:3b00827bb0b7 436 ip_addr_isany(ipaddr) ||
AdamGreen 0:3b00827bb0b7 437 ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
AdamGreen 0:3b00827bb0b7 438 return ERR_USE;
AdamGreen 0:3b00827bb0b7 439 }
AdamGreen 0:3b00827bb0b7 440 }
AdamGreen 0:3b00827bb0b7 441 }
AdamGreen 0:3b00827bb0b7 442 }
AdamGreen 0:3b00827bb0b7 443 }
AdamGreen 0:3b00827bb0b7 444
AdamGreen 0:3b00827bb0b7 445 if (!ip_addr_isany(ipaddr)) {
AdamGreen 0:3b00827bb0b7 446 pcb->local_ip = *ipaddr;
AdamGreen 0:3b00827bb0b7 447 }
AdamGreen 0:3b00827bb0b7 448 pcb->local_port = port;
AdamGreen 0:3b00827bb0b7 449 TCP_REG(&tcp_bound_pcbs, pcb);
AdamGreen 0:3b00827bb0b7 450 LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
AdamGreen 0:3b00827bb0b7 451 return ERR_OK;
AdamGreen 0:3b00827bb0b7 452 }
AdamGreen 0:3b00827bb0b7 453 #if LWIP_CALLBACK_API
AdamGreen 0:3b00827bb0b7 454 /**
AdamGreen 0:3b00827bb0b7 455 * Default accept callback if no accept callback is specified by the user.
AdamGreen 0:3b00827bb0b7 456 */
AdamGreen 0:3b00827bb0b7 457 static err_t
AdamGreen 0:3b00827bb0b7 458 tcp_accept_null(void *arg, struct tcp_pcb *pcb, err_t err)
AdamGreen 0:3b00827bb0b7 459 {
AdamGreen 0:3b00827bb0b7 460 LWIP_UNUSED_ARG(arg);
AdamGreen 0:3b00827bb0b7 461 LWIP_UNUSED_ARG(pcb);
AdamGreen 0:3b00827bb0b7 462 LWIP_UNUSED_ARG(err);
AdamGreen 0:3b00827bb0b7 463
AdamGreen 0:3b00827bb0b7 464 return ERR_ABRT;
AdamGreen 0:3b00827bb0b7 465 }
AdamGreen 0:3b00827bb0b7 466 #endif /* LWIP_CALLBACK_API */
AdamGreen 0:3b00827bb0b7 467
AdamGreen 0:3b00827bb0b7 468 /**
AdamGreen 0:3b00827bb0b7 469 * Set the state of the connection to be LISTEN, which means that it
AdamGreen 0:3b00827bb0b7 470 * is able to accept incoming connections. The protocol control block
AdamGreen 0:3b00827bb0b7 471 * is reallocated in order to consume less memory. Setting the
AdamGreen 0:3b00827bb0b7 472 * connection to LISTEN is an irreversible process.
AdamGreen 0:3b00827bb0b7 473 *
AdamGreen 0:3b00827bb0b7 474 * @param pcb the original tcp_pcb
AdamGreen 0:3b00827bb0b7 475 * @param backlog the incoming connections queue limit
AdamGreen 0:3b00827bb0b7 476 * @return tcp_pcb used for listening, consumes less memory.
AdamGreen 0:3b00827bb0b7 477 *
AdamGreen 0:3b00827bb0b7 478 * @note The original tcp_pcb is freed. This function therefore has to be
AdamGreen 0:3b00827bb0b7 479 * called like this:
AdamGreen 0:3b00827bb0b7 480 * tpcb = tcp_listen(tpcb);
AdamGreen 0:3b00827bb0b7 481 */
AdamGreen 0:3b00827bb0b7 482 struct tcp_pcb *
AdamGreen 0:3b00827bb0b7 483 tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
AdamGreen 0:3b00827bb0b7 484 {
AdamGreen 0:3b00827bb0b7 485 struct tcp_pcb_listen *lpcb;
AdamGreen 0:3b00827bb0b7 486
AdamGreen 0:3b00827bb0b7 487 LWIP_UNUSED_ARG(backlog);
AdamGreen 0:3b00827bb0b7 488 LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL);
AdamGreen 0:3b00827bb0b7 489
AdamGreen 0:3b00827bb0b7 490 /* already listening? */
AdamGreen 0:3b00827bb0b7 491 if (pcb->state == LISTEN) {
AdamGreen 0:3b00827bb0b7 492 return pcb;
AdamGreen 0:3b00827bb0b7 493 }
AdamGreen 0:3b00827bb0b7 494 #if SO_REUSE
AdamGreen 0:3b00827bb0b7 495 if ((pcb->so_options & SOF_REUSEADDR) != 0) {
AdamGreen 0:3b00827bb0b7 496 /* Since SOF_REUSEADDR allows reusing a local address before the pcb's usage
AdamGreen 0:3b00827bb0b7 497 is declared (listen-/connection-pcb), we have to make sure now that
AdamGreen 0:3b00827bb0b7 498 this port is only used once for every local IP. */
AdamGreen 0:3b00827bb0b7 499 for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
AdamGreen 0:3b00827bb0b7 500 if (lpcb->local_port == pcb->local_port) {
AdamGreen 0:3b00827bb0b7 501 if (ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
AdamGreen 0:3b00827bb0b7 502 /* this address/port is already used */
AdamGreen 0:3b00827bb0b7 503 return NULL;
AdamGreen 0:3b00827bb0b7 504 }
AdamGreen 0:3b00827bb0b7 505 }
AdamGreen 0:3b00827bb0b7 506 }
AdamGreen 0:3b00827bb0b7 507 }
AdamGreen 0:3b00827bb0b7 508 #endif /* SO_REUSE */
AdamGreen 0:3b00827bb0b7 509 lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
AdamGreen 0:3b00827bb0b7 510 if (lpcb == NULL) {
AdamGreen 0:3b00827bb0b7 511 return NULL;
AdamGreen 0:3b00827bb0b7 512 }
AdamGreen 0:3b00827bb0b7 513 lpcb->callback_arg = pcb->callback_arg;
AdamGreen 0:3b00827bb0b7 514 lpcb->local_port = pcb->local_port;
AdamGreen 0:3b00827bb0b7 515 lpcb->state = LISTEN;
AdamGreen 0:3b00827bb0b7 516 lpcb->prio = pcb->prio;
AdamGreen 0:3b00827bb0b7 517 lpcb->so_options = pcb->so_options;
AdamGreen 0:3b00827bb0b7 518 lpcb->so_options |= SOF_ACCEPTCONN;
AdamGreen 0:3b00827bb0b7 519 lpcb->ttl = pcb->ttl;
AdamGreen 0:3b00827bb0b7 520 lpcb->tos = pcb->tos;
AdamGreen 0:3b00827bb0b7 521 ip_addr_copy(lpcb->local_ip, pcb->local_ip);
AdamGreen 0:3b00827bb0b7 522 if (pcb->local_port != 0) {
AdamGreen 0:3b00827bb0b7 523 TCP_RMV(&tcp_bound_pcbs, pcb);
AdamGreen 0:3b00827bb0b7 524 }
AdamGreen 0:3b00827bb0b7 525 memp_free(MEMP_TCP_PCB, pcb);
AdamGreen 0:3b00827bb0b7 526 #if LWIP_CALLBACK_API
AdamGreen 0:3b00827bb0b7 527 lpcb->accept = tcp_accept_null;
AdamGreen 0:3b00827bb0b7 528 #endif /* LWIP_CALLBACK_API */
AdamGreen 0:3b00827bb0b7 529 #if TCP_LISTEN_BACKLOG
AdamGreen 0:3b00827bb0b7 530 lpcb->accepts_pending = 0;
AdamGreen 0:3b00827bb0b7 531 lpcb->backlog = (backlog ? backlog : 1);
AdamGreen 0:3b00827bb0b7 532 #endif /* TCP_LISTEN_BACKLOG */
AdamGreen 0:3b00827bb0b7 533 TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
AdamGreen 0:3b00827bb0b7 534 return (struct tcp_pcb *)lpcb;
AdamGreen 0:3b00827bb0b7 535 }
AdamGreen 0:3b00827bb0b7 536
AdamGreen 0:3b00827bb0b7 537 /**
AdamGreen 0:3b00827bb0b7 538 * Update the state that tracks the available window space to advertise.
AdamGreen 0:3b00827bb0b7 539 *
AdamGreen 0:3b00827bb0b7 540 * Returns how much extra window would be advertised if we sent an
AdamGreen 0:3b00827bb0b7 541 * update now.
AdamGreen 0:3b00827bb0b7 542 */
AdamGreen 0:3b00827bb0b7 543 u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
AdamGreen 0:3b00827bb0b7 544 {
AdamGreen 0:3b00827bb0b7 545 u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
AdamGreen 0:3b00827bb0b7 546
AdamGreen 0:3b00827bb0b7 547 if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) {
AdamGreen 0:3b00827bb0b7 548 /* we can advertise more window */
AdamGreen 0:3b00827bb0b7 549 pcb->rcv_ann_wnd = pcb->rcv_wnd;
AdamGreen 0:3b00827bb0b7 550 return new_right_edge - pcb->rcv_ann_right_edge;
AdamGreen 0:3b00827bb0b7 551 } else {
AdamGreen 0:3b00827bb0b7 552 if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
AdamGreen 0:3b00827bb0b7 553 /* Can happen due to other end sending out of advertised window,
AdamGreen 0:3b00827bb0b7 554 * but within actual available (but not yet advertised) window */
AdamGreen 0:3b00827bb0b7 555 pcb->rcv_ann_wnd = 0;
AdamGreen 0:3b00827bb0b7 556 } else {
AdamGreen 0:3b00827bb0b7 557 /* keep the right edge of window constant */
AdamGreen 0:3b00827bb0b7 558 u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
AdamGreen 0:3b00827bb0b7 559 LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff", new_rcv_ann_wnd <= 0xffff);
AdamGreen 0:3b00827bb0b7 560 pcb->rcv_ann_wnd = (u16_t)new_rcv_ann_wnd;
AdamGreen 0:3b00827bb0b7 561 }
AdamGreen 0:3b00827bb0b7 562 return 0;
AdamGreen 0:3b00827bb0b7 563 }
AdamGreen 0:3b00827bb0b7 564 }
AdamGreen 0:3b00827bb0b7 565
AdamGreen 0:3b00827bb0b7 566 /**
AdamGreen 0:3b00827bb0b7 567 * This function should be called by the application when it has
AdamGreen 0:3b00827bb0b7 568 * processed the data. The purpose is to advertise a larger window
AdamGreen 0:3b00827bb0b7 569 * when the data has been processed.
AdamGreen 0:3b00827bb0b7 570 *
AdamGreen 0:3b00827bb0b7 571 * @param pcb the tcp_pcb for which data is read
AdamGreen 0:3b00827bb0b7 572 * @param len the amount of bytes that have been read by the application
AdamGreen 0:3b00827bb0b7 573 */
AdamGreen 0:3b00827bb0b7 574 void
AdamGreen 0:3b00827bb0b7 575 tcp_recved(struct tcp_pcb *pcb, u16_t len)
AdamGreen 0:3b00827bb0b7 576 {
AdamGreen 0:3b00827bb0b7 577 int wnd_inflation;
AdamGreen 0:3b00827bb0b7 578
AdamGreen 0:3b00827bb0b7 579 LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
AdamGreen 0:3b00827bb0b7 580 len <= 0xffff - pcb->rcv_wnd );
AdamGreen 0:3b00827bb0b7 581
AdamGreen 0:3b00827bb0b7 582 pcb->rcv_wnd += len;
AdamGreen 0:3b00827bb0b7 583 if (pcb->rcv_wnd > TCP_WND) {
AdamGreen 0:3b00827bb0b7 584 pcb->rcv_wnd = TCP_WND;
AdamGreen 0:3b00827bb0b7 585 }
AdamGreen 0:3b00827bb0b7 586
AdamGreen 0:3b00827bb0b7 587 wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
AdamGreen 0:3b00827bb0b7 588
AdamGreen 0:3b00827bb0b7 589 /* If the change in the right edge of window is significant (default
AdamGreen 0:3b00827bb0b7 590 * watermark is TCP_WND/4), then send an explicit update now.
AdamGreen 0:3b00827bb0b7 591 * Otherwise wait for a packet to be sent in the normal course of
AdamGreen 0:3b00827bb0b7 592 * events (or more window to be available later) */
AdamGreen 0:3b00827bb0b7 593 if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
AdamGreen 0:3b00827bb0b7 594 tcp_ack_now(pcb);
AdamGreen 0:3b00827bb0b7 595 tcp_output(pcb);
AdamGreen 0:3b00827bb0b7 596 }
AdamGreen 0:3b00827bb0b7 597
AdamGreen 0:3b00827bb0b7 598 LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
AdamGreen 0:3b00827bb0b7 599 len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
AdamGreen 0:3b00827bb0b7 600 }
AdamGreen 0:3b00827bb0b7 601
AdamGreen 0:3b00827bb0b7 602 /**
AdamGreen 0:3b00827bb0b7 603 * A nastly hack featuring 'goto' statements that allocates a
AdamGreen 0:3b00827bb0b7 604 * new TCP local port.
AdamGreen 0:3b00827bb0b7 605 *
AdamGreen 0:3b00827bb0b7 606 * @return a new (free) local TCP port number
AdamGreen 0:3b00827bb0b7 607 */
AdamGreen 0:3b00827bb0b7 608 static u16_t
AdamGreen 0:3b00827bb0b7 609 tcp_new_port(void)
AdamGreen 0:3b00827bb0b7 610 {
AdamGreen 0:3b00827bb0b7 611 int i;
AdamGreen 0:3b00827bb0b7 612 struct tcp_pcb *pcb;
AdamGreen 0:3b00827bb0b7 613 #ifndef TCP_LOCAL_PORT_RANGE_START
AdamGreen 0:3b00827bb0b7 614 /* From http://www.iana.org/assignments/port-numbers:
AdamGreen 0:3b00827bb0b7 615 "The Dynamic and/or Private Ports are those from 49152 through 65535" */
AdamGreen 0:3b00827bb0b7 616 #define TCP_LOCAL_PORT_RANGE_START 0xc000
AdamGreen 0:3b00827bb0b7 617 #define TCP_LOCAL_PORT_RANGE_END 0xffff
AdamGreen 0:3b00827bb0b7 618 #endif
AdamGreen 0:3b00827bb0b7 619 static u16_t port = TCP_LOCAL_PORT_RANGE_START;
AdamGreen 0:3b00827bb0b7 620
AdamGreen 0:3b00827bb0b7 621 again:
AdamGreen 0:3b00827bb0b7 622 if (port++ >= TCP_LOCAL_PORT_RANGE_END) {
AdamGreen 0:3b00827bb0b7 623 port = TCP_LOCAL_PORT_RANGE_START;
AdamGreen 0:3b00827bb0b7 624 }
AdamGreen 0:3b00827bb0b7 625 /* Check all PCB lists. */
AdamGreen 0:3b00827bb0b7 626 for (i = 0; i < NUM_TCP_PCB_LISTS; i++) {
AdamGreen 0:3b00827bb0b7 627 for(pcb = *tcp_pcb_lists[i]; pcb != NULL; pcb = pcb->next) {
AdamGreen 0:3b00827bb0b7 628 if (pcb->local_port == port) {
AdamGreen 0:3b00827bb0b7 629 goto again;
AdamGreen 0:3b00827bb0b7 630 }
AdamGreen 0:3b00827bb0b7 631 }
AdamGreen 0:3b00827bb0b7 632 }
AdamGreen 0:3b00827bb0b7 633 return port;
AdamGreen 0:3b00827bb0b7 634 }
AdamGreen 0:3b00827bb0b7 635
AdamGreen 0:3b00827bb0b7 636 /**
AdamGreen 0:3b00827bb0b7 637 * Connects to another host. The function given as the "connected"
AdamGreen 0:3b00827bb0b7 638 * argument will be called when the connection has been established.
AdamGreen 0:3b00827bb0b7 639 *
AdamGreen 0:3b00827bb0b7 640 * @param pcb the tcp_pcb used to establish the connection
AdamGreen 0:3b00827bb0b7 641 * @param ipaddr the remote ip address to connect to
AdamGreen 0:3b00827bb0b7 642 * @param port the remote tcp port to connect to
AdamGreen 0:3b00827bb0b7 643 * @param connected callback function to call when connected (or on error)
AdamGreen 0:3b00827bb0b7 644 * @return ERR_VAL if invalid arguments are given
AdamGreen 0:3b00827bb0b7 645 * ERR_OK if connect request has been sent
AdamGreen 0:3b00827bb0b7 646 * other err_t values if connect request couldn't be sent
AdamGreen 0:3b00827bb0b7 647 */
AdamGreen 0:3b00827bb0b7 648 err_t
AdamGreen 0:3b00827bb0b7 649 tcp_connect(struct tcp_pcb *pcb, ip_addr_t *ipaddr, u16_t port,
AdamGreen 0:3b00827bb0b7 650 tcp_connected_fn connected)
AdamGreen 0:3b00827bb0b7 651 {
AdamGreen 0:3b00827bb0b7 652 err_t ret;
AdamGreen 0:3b00827bb0b7 653 u32_t iss;
AdamGreen 0:3b00827bb0b7 654 u16_t old_local_port;
AdamGreen 0:3b00827bb0b7 655
AdamGreen 0:3b00827bb0b7 656 LWIP_ERROR("tcp_connect: can only connect from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
AdamGreen 0:3b00827bb0b7 657
AdamGreen 0:3b00827bb0b7 658 LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
AdamGreen 0:3b00827bb0b7 659 if (ipaddr != NULL) {
AdamGreen 0:3b00827bb0b7 660 pcb->remote_ip = *ipaddr;
AdamGreen 0:3b00827bb0b7 661 } else {
AdamGreen 0:3b00827bb0b7 662 return ERR_VAL;
AdamGreen 0:3b00827bb0b7 663 }
AdamGreen 0:3b00827bb0b7 664 pcb->remote_port = port;
AdamGreen 0:3b00827bb0b7 665
AdamGreen 0:3b00827bb0b7 666 /* check if we have a route to the remote host */
AdamGreen 0:3b00827bb0b7 667 if (ip_addr_isany(&(pcb->local_ip))) {
AdamGreen 0:3b00827bb0b7 668 /* no local IP address set, yet. */
AdamGreen 0:3b00827bb0b7 669 struct netif *netif = ip_route(&(pcb->remote_ip));
AdamGreen 0:3b00827bb0b7 670 if (netif == NULL) {
AdamGreen 0:3b00827bb0b7 671 /* Don't even try to send a SYN packet if we have no route
AdamGreen 0:3b00827bb0b7 672 since that will fail. */
AdamGreen 0:3b00827bb0b7 673 return ERR_RTE;
AdamGreen 0:3b00827bb0b7 674 }
AdamGreen 0:3b00827bb0b7 675 /* Use the netif's IP address as local address. */
AdamGreen 0:3b00827bb0b7 676 ip_addr_copy(pcb->local_ip, netif->ip_addr);
AdamGreen 0:3b00827bb0b7 677 }
AdamGreen 0:3b00827bb0b7 678
AdamGreen 0:3b00827bb0b7 679 old_local_port = pcb->local_port;
AdamGreen 0:3b00827bb0b7 680 if (pcb->local_port == 0) {
AdamGreen 0:3b00827bb0b7 681 pcb->local_port = tcp_new_port();
AdamGreen 0:3b00827bb0b7 682 }
AdamGreen 0:3b00827bb0b7 683 #if SO_REUSE
AdamGreen 0:3b00827bb0b7 684 if ((pcb->so_options & SOF_REUSEADDR) != 0) {
AdamGreen 0:3b00827bb0b7 685 /* Since SOF_REUSEADDR allows reusing a local address, we have to make sure
AdamGreen 0:3b00827bb0b7 686 now that the 5-tuple is unique. */
AdamGreen 0:3b00827bb0b7 687 struct tcp_pcb *cpcb;
AdamGreen 0:3b00827bb0b7 688 int i;
AdamGreen 0:3b00827bb0b7 689 /* Don't check listen- and bound-PCBs, check active- and TIME-WAIT PCBs. */
AdamGreen 0:3b00827bb0b7 690 for (i = 2; i < NUM_TCP_PCB_LISTS; i++) {
AdamGreen 0:3b00827bb0b7 691 for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
AdamGreen 0:3b00827bb0b7 692 if ((cpcb->local_port == pcb->local_port) &&
AdamGreen 0:3b00827bb0b7 693 (cpcb->remote_port == port) &&
AdamGreen 0:3b00827bb0b7 694 ip_addr_cmp(&cpcb->local_ip, &pcb->local_ip) &&
AdamGreen 0:3b00827bb0b7 695 ip_addr_cmp(&cpcb->remote_ip, ipaddr)) {
AdamGreen 0:3b00827bb0b7 696 /* linux returns EISCONN here, but ERR_USE should be OK for us */
AdamGreen 0:3b00827bb0b7 697 return ERR_USE;
AdamGreen 0:3b00827bb0b7 698 }
AdamGreen 0:3b00827bb0b7 699 }
AdamGreen 0:3b00827bb0b7 700 }
AdamGreen 0:3b00827bb0b7 701 }
AdamGreen 0:3b00827bb0b7 702 #endif /* SO_REUSE */
AdamGreen 0:3b00827bb0b7 703 iss = tcp_next_iss();
AdamGreen 0:3b00827bb0b7 704 pcb->rcv_nxt = 0;
AdamGreen 0:3b00827bb0b7 705 pcb->snd_nxt = iss;
AdamGreen 0:3b00827bb0b7 706 pcb->lastack = iss - 1;
AdamGreen 0:3b00827bb0b7 707 pcb->snd_lbb = iss - 1;
AdamGreen 0:3b00827bb0b7 708 pcb->rcv_wnd = TCP_WND;
AdamGreen 0:3b00827bb0b7 709 pcb->rcv_ann_wnd = TCP_WND;
AdamGreen 0:3b00827bb0b7 710 pcb->rcv_ann_right_edge = pcb->rcv_nxt;
AdamGreen 0:3b00827bb0b7 711 pcb->snd_wnd = TCP_WND;
AdamGreen 0:3b00827bb0b7 712 /* As initial send MSS, we use TCP_MSS but limit it to 536.
AdamGreen 0:3b00827bb0b7 713 The send MSS is updated when an MSS option is received. */
AdamGreen 0:3b00827bb0b7 714 pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
AdamGreen 0:3b00827bb0b7 715 #if TCP_CALCULATE_EFF_SEND_MSS
AdamGreen 0:3b00827bb0b7 716 pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr);
AdamGreen 0:3b00827bb0b7 717 #endif /* TCP_CALCULATE_EFF_SEND_MSS */
AdamGreen 0:3b00827bb0b7 718 pcb->cwnd = 1;
AdamGreen 0:3b00827bb0b7 719 pcb->ssthresh = pcb->mss * 10;
AdamGreen 0:3b00827bb0b7 720 #if LWIP_CALLBACK_API
AdamGreen 0:3b00827bb0b7 721 pcb->connected = connected;
AdamGreen 0:3b00827bb0b7 722 #else /* LWIP_CALLBACK_API */
AdamGreen 0:3b00827bb0b7 723 LWIP_UNUSED_ARG(connected);
AdamGreen 0:3b00827bb0b7 724 #endif /* LWIP_CALLBACK_API */
AdamGreen 0:3b00827bb0b7 725
AdamGreen 0:3b00827bb0b7 726 /* Send a SYN together with the MSS option. */
AdamGreen 0:3b00827bb0b7 727 ret = tcp_enqueue_flags(pcb, TCP_SYN);
AdamGreen 0:3b00827bb0b7 728 if (ret == ERR_OK) {
AdamGreen 0:3b00827bb0b7 729 /* SYN segment was enqueued, changed the pcbs state now */
AdamGreen 0:3b00827bb0b7 730 pcb->state = SYN_SENT;
AdamGreen 0:3b00827bb0b7 731 if (old_local_port != 0) {
AdamGreen 0:3b00827bb0b7 732 TCP_RMV(&tcp_bound_pcbs, pcb);
AdamGreen 0:3b00827bb0b7 733 }
AdamGreen 0:3b00827bb0b7 734 TCP_REG(&tcp_active_pcbs, pcb);
AdamGreen 0:3b00827bb0b7 735 snmp_inc_tcpactiveopens();
AdamGreen 0:3b00827bb0b7 736
AdamGreen 0:3b00827bb0b7 737 tcp_output(pcb);
AdamGreen 0:3b00827bb0b7 738 }
AdamGreen 0:3b00827bb0b7 739 return ret;
AdamGreen 0:3b00827bb0b7 740 }
AdamGreen 0:3b00827bb0b7 741
AdamGreen 0:3b00827bb0b7 742 /**
AdamGreen 0:3b00827bb0b7 743 * Called every 500 ms and implements the retransmission timer and the timer that
AdamGreen 0:3b00827bb0b7 744 * removes PCBs that have been in TIME-WAIT for enough time. It also increments
AdamGreen 0:3b00827bb0b7 745 * various timers such as the inactivity timer in each PCB.
AdamGreen 0:3b00827bb0b7 746 *
AdamGreen 0:3b00827bb0b7 747 * Automatically called from tcp_tmr().
AdamGreen 0:3b00827bb0b7 748 */
AdamGreen 0:3b00827bb0b7 749 void
AdamGreen 0:3b00827bb0b7 750 tcp_slowtmr(void)
AdamGreen 0:3b00827bb0b7 751 {
AdamGreen 0:3b00827bb0b7 752 struct tcp_pcb *pcb, *prev;
AdamGreen 0:3b00827bb0b7 753 u16_t eff_wnd;
AdamGreen 0:3b00827bb0b7 754 u8_t pcb_remove; /* flag if a PCB should be removed */
AdamGreen 0:3b00827bb0b7 755 u8_t pcb_reset; /* flag if a RST should be sent when removing */
AdamGreen 0:3b00827bb0b7 756 err_t err;
AdamGreen 0:3b00827bb0b7 757
AdamGreen 0:3b00827bb0b7 758 err = ERR_OK;
AdamGreen 0:3b00827bb0b7 759
AdamGreen 0:3b00827bb0b7 760 ++tcp_ticks;
AdamGreen 0:3b00827bb0b7 761
AdamGreen 0:3b00827bb0b7 762 /* Steps through all of the active PCBs. */
AdamGreen 0:3b00827bb0b7 763 prev = NULL;
AdamGreen 0:3b00827bb0b7 764 pcb = tcp_active_pcbs;
AdamGreen 0:3b00827bb0b7 765 if (pcb == NULL) {
AdamGreen 0:3b00827bb0b7 766 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
AdamGreen 0:3b00827bb0b7 767 }
AdamGreen 0:3b00827bb0b7 768 while (pcb != NULL) {
AdamGreen 0:3b00827bb0b7 769 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
AdamGreen 0:3b00827bb0b7 770 LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
AdamGreen 0:3b00827bb0b7 771 LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
AdamGreen 0:3b00827bb0b7 772 LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
AdamGreen 0:3b00827bb0b7 773
AdamGreen 0:3b00827bb0b7 774 pcb_remove = 0;
AdamGreen 0:3b00827bb0b7 775 pcb_reset = 0;
AdamGreen 0:3b00827bb0b7 776
AdamGreen 0:3b00827bb0b7 777 if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
AdamGreen 0:3b00827bb0b7 778 ++pcb_remove;
AdamGreen 0:3b00827bb0b7 779 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
AdamGreen 0:3b00827bb0b7 780 }
AdamGreen 0:3b00827bb0b7 781 else if (pcb->nrtx == TCP_MAXRTX) {
AdamGreen 0:3b00827bb0b7 782 ++pcb_remove;
AdamGreen 0:3b00827bb0b7 783 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
AdamGreen 0:3b00827bb0b7 784 } else {
AdamGreen 0:3b00827bb0b7 785 if (pcb->persist_backoff > 0) {
AdamGreen 0:3b00827bb0b7 786 /* If snd_wnd is zero, use persist timer to send 1 byte probes
AdamGreen 0:3b00827bb0b7 787 * instead of using the standard retransmission mechanism. */
AdamGreen 0:3b00827bb0b7 788 pcb->persist_cnt++;
AdamGreen 0:3b00827bb0b7 789 if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) {
AdamGreen 0:3b00827bb0b7 790 pcb->persist_cnt = 0;
AdamGreen 0:3b00827bb0b7 791 if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
AdamGreen 0:3b00827bb0b7 792 pcb->persist_backoff++;
AdamGreen 0:3b00827bb0b7 793 }
AdamGreen 0:3b00827bb0b7 794 tcp_zero_window_probe(pcb);
AdamGreen 0:3b00827bb0b7 795 }
AdamGreen 0:3b00827bb0b7 796 } else {
AdamGreen 0:3b00827bb0b7 797 /* Increase the retransmission timer if it is running */
AdamGreen 0:3b00827bb0b7 798 if(pcb->rtime >= 0)
AdamGreen 0:3b00827bb0b7 799 ++pcb->rtime;
AdamGreen 0:3b00827bb0b7 800
AdamGreen 0:3b00827bb0b7 801 if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
AdamGreen 0:3b00827bb0b7 802 /* Time for a retransmission. */
AdamGreen 0:3b00827bb0b7 803 LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
AdamGreen 0:3b00827bb0b7 804 " pcb->rto %"S16_F"\n",
AdamGreen 0:3b00827bb0b7 805 pcb->rtime, pcb->rto));
AdamGreen 0:3b00827bb0b7 806
AdamGreen 0:3b00827bb0b7 807 /* Double retransmission time-out unless we are trying to
AdamGreen 0:3b00827bb0b7 808 * connect to somebody (i.e., we are in SYN_SENT). */
AdamGreen 0:3b00827bb0b7 809 if (pcb->state != SYN_SENT) {
AdamGreen 0:3b00827bb0b7 810 pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
AdamGreen 0:3b00827bb0b7 811 }
AdamGreen 0:3b00827bb0b7 812
AdamGreen 0:3b00827bb0b7 813 /* Reset the retransmission timer. */
AdamGreen 0:3b00827bb0b7 814 pcb->rtime = 0;
AdamGreen 0:3b00827bb0b7 815
AdamGreen 0:3b00827bb0b7 816 /* Reduce congestion window and ssthresh. */
AdamGreen 0:3b00827bb0b7 817 eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
AdamGreen 0:3b00827bb0b7 818 pcb->ssthresh = eff_wnd >> 1;
AdamGreen 0:3b00827bb0b7 819 if (pcb->ssthresh < (pcb->mss << 1)) {
AdamGreen 0:3b00827bb0b7 820 pcb->ssthresh = (pcb->mss << 1);
AdamGreen 0:3b00827bb0b7 821 }
AdamGreen 0:3b00827bb0b7 822 pcb->cwnd = pcb->mss;
AdamGreen 0:3b00827bb0b7 823 LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F
AdamGreen 0:3b00827bb0b7 824 " ssthresh %"U16_F"\n",
AdamGreen 0:3b00827bb0b7 825 pcb->cwnd, pcb->ssthresh));
AdamGreen 0:3b00827bb0b7 826
AdamGreen 0:3b00827bb0b7 827 /* The following needs to be called AFTER cwnd is set to one
AdamGreen 0:3b00827bb0b7 828 mss - STJ */
AdamGreen 0:3b00827bb0b7 829 tcp_rexmit_rto(pcb);
AdamGreen 0:3b00827bb0b7 830 }
AdamGreen 0:3b00827bb0b7 831 }
AdamGreen 0:3b00827bb0b7 832 }
AdamGreen 0:3b00827bb0b7 833 /* Check if this PCB has stayed too long in FIN-WAIT-2 */
AdamGreen 0:3b00827bb0b7 834 if (pcb->state == FIN_WAIT_2) {
AdamGreen 0:3b00827bb0b7 835 if ((u32_t)(tcp_ticks - pcb->tmr) >
AdamGreen 0:3b00827bb0b7 836 TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
AdamGreen 0:3b00827bb0b7 837 ++pcb_remove;
AdamGreen 0:3b00827bb0b7 838 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
AdamGreen 0:3b00827bb0b7 839 }
AdamGreen 0:3b00827bb0b7 840 }
AdamGreen 0:3b00827bb0b7 841
AdamGreen 0:3b00827bb0b7 842 /* Check if KEEPALIVE should be sent */
AdamGreen 0:3b00827bb0b7 843 if((pcb->so_options & SOF_KEEPALIVE) &&
AdamGreen 0:3b00827bb0b7 844 ((pcb->state == ESTABLISHED) ||
AdamGreen 0:3b00827bb0b7 845 (pcb->state == CLOSE_WAIT))) {
AdamGreen 0:3b00827bb0b7 846 #if LWIP_TCP_KEEPALIVE
AdamGreen 0:3b00827bb0b7 847 if((u32_t)(tcp_ticks - pcb->tmr) >
AdamGreen 0:3b00827bb0b7 848 (pcb->keep_idle + (pcb->keep_cnt*pcb->keep_intvl))
AdamGreen 0:3b00827bb0b7 849 / TCP_SLOW_INTERVAL)
AdamGreen 0:3b00827bb0b7 850 #else
AdamGreen 0:3b00827bb0b7 851 if((u32_t)(tcp_ticks - pcb->tmr) >
AdamGreen 0:3b00827bb0b7 852 (pcb->keep_idle + TCP_MAXIDLE) / TCP_SLOW_INTERVAL)
AdamGreen 0:3b00827bb0b7 853 #endif /* LWIP_TCP_KEEPALIVE */
AdamGreen 0:3b00827bb0b7 854 {
AdamGreen 0:3b00827bb0b7 855 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n",
AdamGreen 0:3b00827bb0b7 856 ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
AdamGreen 0:3b00827bb0b7 857 ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
AdamGreen 0:3b00827bb0b7 858
AdamGreen 0:3b00827bb0b7 859 ++pcb_remove;
AdamGreen 0:3b00827bb0b7 860 ++pcb_reset;
AdamGreen 0:3b00827bb0b7 861 }
AdamGreen 0:3b00827bb0b7 862 #if LWIP_TCP_KEEPALIVE
AdamGreen 0:3b00827bb0b7 863 else if((u32_t)(tcp_ticks - pcb->tmr) >
AdamGreen 0:3b00827bb0b7 864 (pcb->keep_idle + pcb->keep_cnt_sent * pcb->keep_intvl)
AdamGreen 0:3b00827bb0b7 865 / TCP_SLOW_INTERVAL)
AdamGreen 0:3b00827bb0b7 866 #else
AdamGreen 0:3b00827bb0b7 867 else if((u32_t)(tcp_ticks - pcb->tmr) >
AdamGreen 0:3b00827bb0b7 868 (pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEPINTVL_DEFAULT)
AdamGreen 0:3b00827bb0b7 869 / TCP_SLOW_INTERVAL)
AdamGreen 0:3b00827bb0b7 870 #endif /* LWIP_TCP_KEEPALIVE */
AdamGreen 0:3b00827bb0b7 871 {
AdamGreen 0:3b00827bb0b7 872 tcp_keepalive(pcb);
AdamGreen 0:3b00827bb0b7 873 pcb->keep_cnt_sent++;
AdamGreen 0:3b00827bb0b7 874 }
AdamGreen 0:3b00827bb0b7 875 }
AdamGreen 0:3b00827bb0b7 876
AdamGreen 0:3b00827bb0b7 877 /* If this PCB has queued out of sequence data, but has been
AdamGreen 0:3b00827bb0b7 878 inactive for too long, will drop the data (it will eventually
AdamGreen 0:3b00827bb0b7 879 be retransmitted). */
AdamGreen 0:3b00827bb0b7 880 #if TCP_QUEUE_OOSEQ
AdamGreen 0:3b00827bb0b7 881 if (pcb->ooseq != NULL &&
AdamGreen 0:3b00827bb0b7 882 (u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) {
AdamGreen 0:3b00827bb0b7 883 tcp_segs_free(pcb->ooseq);
AdamGreen 0:3b00827bb0b7 884 pcb->ooseq = NULL;
AdamGreen 0:3b00827bb0b7 885 LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
AdamGreen 0:3b00827bb0b7 886 }
AdamGreen 0:3b00827bb0b7 887 #endif /* TCP_QUEUE_OOSEQ */
AdamGreen 0:3b00827bb0b7 888
AdamGreen 0:3b00827bb0b7 889 /* Check if this PCB has stayed too long in SYN-RCVD */
AdamGreen 0:3b00827bb0b7 890 if (pcb->state == SYN_RCVD) {
AdamGreen 0:3b00827bb0b7 891 if ((u32_t)(tcp_ticks - pcb->tmr) >
AdamGreen 0:3b00827bb0b7 892 TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
AdamGreen 0:3b00827bb0b7 893 ++pcb_remove;
AdamGreen 0:3b00827bb0b7 894 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
AdamGreen 0:3b00827bb0b7 895 }
AdamGreen 0:3b00827bb0b7 896 }
AdamGreen 0:3b00827bb0b7 897
AdamGreen 0:3b00827bb0b7 898 /* Check if this PCB has stayed too long in LAST-ACK */
AdamGreen 0:3b00827bb0b7 899 if (pcb->state == LAST_ACK) {
AdamGreen 0:3b00827bb0b7 900 if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
AdamGreen 0:3b00827bb0b7 901 ++pcb_remove;
AdamGreen 0:3b00827bb0b7 902 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
AdamGreen 0:3b00827bb0b7 903 }
AdamGreen 0:3b00827bb0b7 904 }
AdamGreen 0:3b00827bb0b7 905
AdamGreen 0:3b00827bb0b7 906 /* If the PCB should be removed, do it. */
AdamGreen 0:3b00827bb0b7 907 if (pcb_remove) {
AdamGreen 0:3b00827bb0b7 908 struct tcp_pcb *pcb2;
AdamGreen 0:3b00827bb0b7 909 tcp_pcb_purge(pcb);
AdamGreen 0:3b00827bb0b7 910 /* Remove PCB from tcp_active_pcbs list. */
AdamGreen 0:3b00827bb0b7 911 if (prev != NULL) {
AdamGreen 0:3b00827bb0b7 912 LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
AdamGreen 0:3b00827bb0b7 913 prev->next = pcb->next;
AdamGreen 0:3b00827bb0b7 914 } else {
AdamGreen 0:3b00827bb0b7 915 /* This PCB was the first. */
AdamGreen 0:3b00827bb0b7 916 LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
AdamGreen 0:3b00827bb0b7 917 tcp_active_pcbs = pcb->next;
AdamGreen 0:3b00827bb0b7 918 }
AdamGreen 0:3b00827bb0b7 919
AdamGreen 0:3b00827bb0b7 920 TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_ABRT);
AdamGreen 0:3b00827bb0b7 921 if (pcb_reset) {
AdamGreen 0:3b00827bb0b7 922 tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
AdamGreen 0:3b00827bb0b7 923 pcb->local_port, pcb->remote_port);
AdamGreen 0:3b00827bb0b7 924 }
AdamGreen 0:3b00827bb0b7 925
AdamGreen 0:3b00827bb0b7 926 pcb2 = pcb;
AdamGreen 0:3b00827bb0b7 927 pcb = pcb->next;
AdamGreen 0:3b00827bb0b7 928 memp_free(MEMP_TCP_PCB, pcb2);
AdamGreen 0:3b00827bb0b7 929 } else {
AdamGreen 0:3b00827bb0b7 930 /* get the 'next' element now and work with 'prev' below (in case of abort) */
AdamGreen 0:3b00827bb0b7 931 prev = pcb;
AdamGreen 0:3b00827bb0b7 932 pcb = pcb->next;
AdamGreen 0:3b00827bb0b7 933
AdamGreen 0:3b00827bb0b7 934 /* We check if we should poll the connection. */
AdamGreen 0:3b00827bb0b7 935 ++prev->polltmr;
AdamGreen 0:3b00827bb0b7 936 if (prev->polltmr >= prev->pollinterval) {
AdamGreen 0:3b00827bb0b7 937 prev->polltmr = 0;
AdamGreen 0:3b00827bb0b7 938 LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
AdamGreen 0:3b00827bb0b7 939 TCP_EVENT_POLL(prev, err);
AdamGreen 0:3b00827bb0b7 940 /* if err == ERR_ABRT, 'prev' is already deallocated */
AdamGreen 0:3b00827bb0b7 941 if (err == ERR_OK) {
AdamGreen 0:3b00827bb0b7 942 tcp_output(prev);
AdamGreen 0:3b00827bb0b7 943 }
AdamGreen 0:3b00827bb0b7 944 }
AdamGreen 0:3b00827bb0b7 945 }
AdamGreen 0:3b00827bb0b7 946 }
AdamGreen 0:3b00827bb0b7 947
AdamGreen 0:3b00827bb0b7 948
AdamGreen 0:3b00827bb0b7 949 /* Steps through all of the TIME-WAIT PCBs. */
AdamGreen 0:3b00827bb0b7 950 prev = NULL;
AdamGreen 0:3b00827bb0b7 951 pcb = tcp_tw_pcbs;
AdamGreen 0:3b00827bb0b7 952 while (pcb != NULL) {
AdamGreen 0:3b00827bb0b7 953 LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
AdamGreen 0:3b00827bb0b7 954 pcb_remove = 0;
AdamGreen 0:3b00827bb0b7 955
AdamGreen 0:3b00827bb0b7 956 /* Check if this PCB has stayed long enough in TIME-WAIT */
AdamGreen 0:3b00827bb0b7 957 if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
AdamGreen 0:3b00827bb0b7 958 ++pcb_remove;
AdamGreen 0:3b00827bb0b7 959 }
AdamGreen 0:3b00827bb0b7 960
AdamGreen 0:3b00827bb0b7 961
AdamGreen 0:3b00827bb0b7 962
AdamGreen 0:3b00827bb0b7 963 /* If the PCB should be removed, do it. */
AdamGreen 0:3b00827bb0b7 964 if (pcb_remove) {
AdamGreen 0:3b00827bb0b7 965 struct tcp_pcb *pcb2;
AdamGreen 0:3b00827bb0b7 966 tcp_pcb_purge(pcb);
AdamGreen 0:3b00827bb0b7 967 /* Remove PCB from tcp_tw_pcbs list. */
AdamGreen 0:3b00827bb0b7 968 if (prev != NULL) {
AdamGreen 0:3b00827bb0b7 969 LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
AdamGreen 0:3b00827bb0b7 970 prev->next = pcb->next;
AdamGreen 0:3b00827bb0b7 971 } else {
AdamGreen 0:3b00827bb0b7 972 /* This PCB was the first. */
AdamGreen 0:3b00827bb0b7 973 LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
AdamGreen 0:3b00827bb0b7 974 tcp_tw_pcbs = pcb->next;
AdamGreen 0:3b00827bb0b7 975 }
AdamGreen 0:3b00827bb0b7 976 pcb2 = pcb;
AdamGreen 0:3b00827bb0b7 977 pcb = pcb->next;
AdamGreen 0:3b00827bb0b7 978 memp_free(MEMP_TCP_PCB, pcb2);
AdamGreen 0:3b00827bb0b7 979 } else {
AdamGreen 0:3b00827bb0b7 980 prev = pcb;
AdamGreen 0:3b00827bb0b7 981 pcb = pcb->next;
AdamGreen 0:3b00827bb0b7 982 }
AdamGreen 0:3b00827bb0b7 983 }
AdamGreen 0:3b00827bb0b7 984 }
AdamGreen 0:3b00827bb0b7 985
AdamGreen 0:3b00827bb0b7 986 /**
AdamGreen 0:3b00827bb0b7 987 * Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
AdamGreen 0:3b00827bb0b7 988 * "refused" by upper layer (application) and sends delayed ACKs.
AdamGreen 0:3b00827bb0b7 989 *
AdamGreen 0:3b00827bb0b7 990 * Automatically called from tcp_tmr().
AdamGreen 0:3b00827bb0b7 991 */
AdamGreen 0:3b00827bb0b7 992 void
AdamGreen 0:3b00827bb0b7 993 tcp_fasttmr(void)
AdamGreen 0:3b00827bb0b7 994 {
AdamGreen 0:3b00827bb0b7 995 struct tcp_pcb *pcb = tcp_active_pcbs;
AdamGreen 0:3b00827bb0b7 996
AdamGreen 0:3b00827bb0b7 997 while(pcb != NULL) {
AdamGreen 0:3b00827bb0b7 998 struct tcp_pcb *next = pcb->next;
AdamGreen 0:3b00827bb0b7 999 /* If there is data which was previously "refused" by upper layer */
AdamGreen 0:3b00827bb0b7 1000 if (pcb->refused_data != NULL) {
AdamGreen 0:3b00827bb0b7 1001 /* Notify again application with data previously received. */
AdamGreen 0:3b00827bb0b7 1002 err_t err;
AdamGreen 0:3b00827bb0b7 1003 LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_fasttmr: notify kept packet\n"));
AdamGreen 0:3b00827bb0b7 1004 TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
AdamGreen 0:3b00827bb0b7 1005 if (err == ERR_OK) {
AdamGreen 0:3b00827bb0b7 1006 pcb->refused_data = NULL;
AdamGreen 0:3b00827bb0b7 1007 } else if (err == ERR_ABRT) {
AdamGreen 0:3b00827bb0b7 1008 /* if err == ERR_ABRT, 'pcb' is already deallocated */
AdamGreen 0:3b00827bb0b7 1009 pcb = NULL;
AdamGreen 0:3b00827bb0b7 1010 }
AdamGreen 0:3b00827bb0b7 1011 }
AdamGreen 0:3b00827bb0b7 1012
AdamGreen 0:3b00827bb0b7 1013 /* send delayed ACKs */
AdamGreen 0:3b00827bb0b7 1014 if (pcb && (pcb->flags & TF_ACK_DELAY)) {
AdamGreen 0:3b00827bb0b7 1015 LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
AdamGreen 0:3b00827bb0b7 1016 tcp_ack_now(pcb);
AdamGreen 0:3b00827bb0b7 1017 tcp_output(pcb);
AdamGreen 0:3b00827bb0b7 1018 pcb->flags &= ~(TF_ACK_DELAY | TF_ACK_NOW);
AdamGreen 0:3b00827bb0b7 1019 }
AdamGreen 0:3b00827bb0b7 1020
AdamGreen 0:3b00827bb0b7 1021 pcb = next;
AdamGreen 0:3b00827bb0b7 1022 }
AdamGreen 0:3b00827bb0b7 1023 }
AdamGreen 0:3b00827bb0b7 1024
AdamGreen 0:3b00827bb0b7 1025 /**
AdamGreen 0:3b00827bb0b7 1026 * Deallocates a list of TCP segments (tcp_seg structures).
AdamGreen 0:3b00827bb0b7 1027 *
AdamGreen 0:3b00827bb0b7 1028 * @param seg tcp_seg list of TCP segments to free
AdamGreen 0:3b00827bb0b7 1029 */
AdamGreen 0:3b00827bb0b7 1030 void
AdamGreen 0:3b00827bb0b7 1031 tcp_segs_free(struct tcp_seg *seg)
AdamGreen 0:3b00827bb0b7 1032 {
AdamGreen 0:3b00827bb0b7 1033 while (seg != NULL) {
AdamGreen 0:3b00827bb0b7 1034 struct tcp_seg *next = seg->next;
AdamGreen 0:3b00827bb0b7 1035 tcp_seg_free(seg);
AdamGreen 0:3b00827bb0b7 1036 seg = next;
AdamGreen 0:3b00827bb0b7 1037 }
AdamGreen 0:3b00827bb0b7 1038 }
AdamGreen 0:3b00827bb0b7 1039
AdamGreen 0:3b00827bb0b7 1040 /**
AdamGreen 0:3b00827bb0b7 1041 * Frees a TCP segment (tcp_seg structure).
AdamGreen 0:3b00827bb0b7 1042 *
AdamGreen 0:3b00827bb0b7 1043 * @param seg single tcp_seg to free
AdamGreen 0:3b00827bb0b7 1044 */
AdamGreen 0:3b00827bb0b7 1045 void
AdamGreen 0:3b00827bb0b7 1046 tcp_seg_free(struct tcp_seg *seg)
AdamGreen 0:3b00827bb0b7 1047 {
AdamGreen 0:3b00827bb0b7 1048 if (seg != NULL) {
AdamGreen 0:3b00827bb0b7 1049 if (seg->p != NULL) {
AdamGreen 0:3b00827bb0b7 1050 pbuf_free(seg->p);
AdamGreen 0:3b00827bb0b7 1051 #if TCP_DEBUG
AdamGreen 0:3b00827bb0b7 1052 seg->p = NULL;
AdamGreen 0:3b00827bb0b7 1053 #endif /* TCP_DEBUG */
AdamGreen 0:3b00827bb0b7 1054 }
AdamGreen 0:3b00827bb0b7 1055 memp_free(MEMP_TCP_SEG, seg);
AdamGreen 0:3b00827bb0b7 1056 }
AdamGreen 0:3b00827bb0b7 1057 }
AdamGreen 0:3b00827bb0b7 1058
AdamGreen 0:3b00827bb0b7 1059 /**
AdamGreen 0:3b00827bb0b7 1060 * Sets the priority of a connection.
AdamGreen 0:3b00827bb0b7 1061 *
AdamGreen 0:3b00827bb0b7 1062 * @param pcb the tcp_pcb to manipulate
AdamGreen 0:3b00827bb0b7 1063 * @param prio new priority
AdamGreen 0:3b00827bb0b7 1064 */
AdamGreen 0:3b00827bb0b7 1065 void
AdamGreen 0:3b00827bb0b7 1066 tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
AdamGreen 0:3b00827bb0b7 1067 {
AdamGreen 0:3b00827bb0b7 1068 pcb->prio = prio;
AdamGreen 0:3b00827bb0b7 1069 }
AdamGreen 0:3b00827bb0b7 1070
AdamGreen 0:3b00827bb0b7 1071 #if TCP_QUEUE_OOSEQ
AdamGreen 0:3b00827bb0b7 1072 /**
AdamGreen 0:3b00827bb0b7 1073 * Returns a copy of the given TCP segment.
AdamGreen 0:3b00827bb0b7 1074 * The pbuf and data are not copied, only the pointers
AdamGreen 0:3b00827bb0b7 1075 *
AdamGreen 0:3b00827bb0b7 1076 * @param seg the old tcp_seg
AdamGreen 0:3b00827bb0b7 1077 * @return a copy of seg
AdamGreen 0:3b00827bb0b7 1078 */
AdamGreen 0:3b00827bb0b7 1079 struct tcp_seg *
AdamGreen 0:3b00827bb0b7 1080 tcp_seg_copy(struct tcp_seg *seg)
AdamGreen 0:3b00827bb0b7 1081 {
AdamGreen 0:3b00827bb0b7 1082 struct tcp_seg *cseg;
AdamGreen 0:3b00827bb0b7 1083
AdamGreen 0:3b00827bb0b7 1084 cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG);
AdamGreen 0:3b00827bb0b7 1085 if (cseg == NULL) {
AdamGreen 0:3b00827bb0b7 1086 return NULL;
AdamGreen 0:3b00827bb0b7 1087 }
AdamGreen 0:3b00827bb0b7 1088 SMEMCPY((u8_t *)cseg, (const u8_t *)seg, sizeof(struct tcp_seg));
AdamGreen 0:3b00827bb0b7 1089 pbuf_ref(cseg->p);
AdamGreen 0:3b00827bb0b7 1090 return cseg;
AdamGreen 0:3b00827bb0b7 1091 }
AdamGreen 0:3b00827bb0b7 1092 #endif /* TCP_QUEUE_OOSEQ */
AdamGreen 0:3b00827bb0b7 1093
AdamGreen 0:3b00827bb0b7 1094 #if LWIP_CALLBACK_API
AdamGreen 0:3b00827bb0b7 1095 /**
AdamGreen 0:3b00827bb0b7 1096 * Default receive callback that is called if the user didn't register
AdamGreen 0:3b00827bb0b7 1097 * a recv callback for the pcb.
AdamGreen 0:3b00827bb0b7 1098 */
AdamGreen 0:3b00827bb0b7 1099 err_t
AdamGreen 0:3b00827bb0b7 1100 tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
AdamGreen 0:3b00827bb0b7 1101 {
AdamGreen 0:3b00827bb0b7 1102 LWIP_UNUSED_ARG(arg);
AdamGreen 0:3b00827bb0b7 1103 if (p != NULL) {
AdamGreen 0:3b00827bb0b7 1104 tcp_recved(pcb, p->tot_len);
AdamGreen 0:3b00827bb0b7 1105 pbuf_free(p);
AdamGreen 0:3b00827bb0b7 1106 } else if (err == ERR_OK) {
AdamGreen 0:3b00827bb0b7 1107 return tcp_close(pcb);
AdamGreen 0:3b00827bb0b7 1108 }
AdamGreen 0:3b00827bb0b7 1109 return ERR_OK;
AdamGreen 0:3b00827bb0b7 1110 }
AdamGreen 0:3b00827bb0b7 1111 #endif /* LWIP_CALLBACK_API */
AdamGreen 0:3b00827bb0b7 1112
AdamGreen 0:3b00827bb0b7 1113 /**
AdamGreen 0:3b00827bb0b7 1114 * Kills the oldest active connection that has lower priority than prio.
AdamGreen 0:3b00827bb0b7 1115 *
AdamGreen 0:3b00827bb0b7 1116 * @param prio minimum priority
AdamGreen 0:3b00827bb0b7 1117 */
AdamGreen 0:3b00827bb0b7 1118 static void
AdamGreen 0:3b00827bb0b7 1119 tcp_kill_prio(u8_t prio)
AdamGreen 0:3b00827bb0b7 1120 {
AdamGreen 0:3b00827bb0b7 1121 struct tcp_pcb *pcb, *inactive;
AdamGreen 0:3b00827bb0b7 1122 u32_t inactivity;
AdamGreen 0:3b00827bb0b7 1123 u8_t mprio;
AdamGreen 0:3b00827bb0b7 1124
AdamGreen 0:3b00827bb0b7 1125
AdamGreen 0:3b00827bb0b7 1126 mprio = TCP_PRIO_MAX;
AdamGreen 0:3b00827bb0b7 1127
AdamGreen 0:3b00827bb0b7 1128 /* We kill the oldest active connection that has lower priority than prio. */
AdamGreen 0:3b00827bb0b7 1129 inactivity = 0;
AdamGreen 0:3b00827bb0b7 1130 inactive = NULL;
AdamGreen 0:3b00827bb0b7 1131 for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
AdamGreen 0:3b00827bb0b7 1132 if (pcb->prio <= prio &&
AdamGreen 0:3b00827bb0b7 1133 pcb->prio <= mprio &&
AdamGreen 0:3b00827bb0b7 1134 (u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
AdamGreen 0:3b00827bb0b7 1135 inactivity = tcp_ticks - pcb->tmr;
AdamGreen 0:3b00827bb0b7 1136 inactive = pcb;
AdamGreen 0:3b00827bb0b7 1137 mprio = pcb->prio;
AdamGreen 0:3b00827bb0b7 1138 }
AdamGreen 0:3b00827bb0b7 1139 }
AdamGreen 0:3b00827bb0b7 1140 if (inactive != NULL) {
AdamGreen 0:3b00827bb0b7 1141 LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n",
AdamGreen 0:3b00827bb0b7 1142 (void *)inactive, inactivity));
AdamGreen 0:3b00827bb0b7 1143 tcp_abort(inactive);
AdamGreen 0:3b00827bb0b7 1144 }
AdamGreen 0:3b00827bb0b7 1145 }
AdamGreen 0:3b00827bb0b7 1146
AdamGreen 0:3b00827bb0b7 1147 /**
AdamGreen 0:3b00827bb0b7 1148 * Kills the oldest connection that is in TIME_WAIT state.
AdamGreen 0:3b00827bb0b7 1149 * Called from tcp_alloc() if no more connections are available.
AdamGreen 0:3b00827bb0b7 1150 */
AdamGreen 0:3b00827bb0b7 1151 static void
AdamGreen 0:3b00827bb0b7 1152 tcp_kill_timewait(void)
AdamGreen 0:3b00827bb0b7 1153 {
AdamGreen 0:3b00827bb0b7 1154 struct tcp_pcb *pcb, *inactive;
AdamGreen 0:3b00827bb0b7 1155 u32_t inactivity;
AdamGreen 0:3b00827bb0b7 1156
AdamGreen 0:3b00827bb0b7 1157 inactivity = 0;
AdamGreen 0:3b00827bb0b7 1158 inactive = NULL;
AdamGreen 0:3b00827bb0b7 1159 /* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
AdamGreen 0:3b00827bb0b7 1160 for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
AdamGreen 0:3b00827bb0b7 1161 if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
AdamGreen 0:3b00827bb0b7 1162 inactivity = tcp_ticks - pcb->tmr;
AdamGreen 0:3b00827bb0b7 1163 inactive = pcb;
AdamGreen 0:3b00827bb0b7 1164 }
AdamGreen 0:3b00827bb0b7 1165 }
AdamGreen 0:3b00827bb0b7 1166 if (inactive != NULL) {
AdamGreen 0:3b00827bb0b7 1167 LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n",
AdamGreen 0:3b00827bb0b7 1168 (void *)inactive, inactivity));
AdamGreen 0:3b00827bb0b7 1169 tcp_abort(inactive);
AdamGreen 0:3b00827bb0b7 1170 }
AdamGreen 0:3b00827bb0b7 1171 }
AdamGreen 0:3b00827bb0b7 1172
AdamGreen 0:3b00827bb0b7 1173 /**
AdamGreen 0:3b00827bb0b7 1174 * Allocate a new tcp_pcb structure.
AdamGreen 0:3b00827bb0b7 1175 *
AdamGreen 0:3b00827bb0b7 1176 * @param prio priority for the new pcb
AdamGreen 0:3b00827bb0b7 1177 * @return a new tcp_pcb that initially is in state CLOSED
AdamGreen 0:3b00827bb0b7 1178 */
AdamGreen 0:3b00827bb0b7 1179 struct tcp_pcb *
AdamGreen 0:3b00827bb0b7 1180 tcp_alloc(u8_t prio)
AdamGreen 0:3b00827bb0b7 1181 {
AdamGreen 0:3b00827bb0b7 1182 struct tcp_pcb *pcb;
AdamGreen 0:3b00827bb0b7 1183 u32_t iss;
AdamGreen 0:3b00827bb0b7 1184
AdamGreen 0:3b00827bb0b7 1185 pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
AdamGreen 0:3b00827bb0b7 1186 if (pcb == NULL) {
AdamGreen 0:3b00827bb0b7 1187 /* Try killing oldest connection in TIME-WAIT. */
AdamGreen 0:3b00827bb0b7 1188 LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
AdamGreen 0:3b00827bb0b7 1189 tcp_kill_timewait();
AdamGreen 0:3b00827bb0b7 1190 /* Try to allocate a tcp_pcb again. */
AdamGreen 0:3b00827bb0b7 1191 pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
AdamGreen 0:3b00827bb0b7 1192 if (pcb == NULL) {
AdamGreen 0:3b00827bb0b7 1193 /* Try killing active connections with lower priority than the new one. */
AdamGreen 0:3b00827bb0b7 1194 LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing connection with prio lower than %d\n", prio));
AdamGreen 0:3b00827bb0b7 1195 tcp_kill_prio(prio);
AdamGreen 0:3b00827bb0b7 1196 /* Try to allocate a tcp_pcb again. */
AdamGreen 0:3b00827bb0b7 1197 pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
AdamGreen 0:3b00827bb0b7 1198 if (pcb != NULL) {
AdamGreen 0:3b00827bb0b7 1199 /* adjust err stats: memp_malloc failed twice before */
AdamGreen 0:3b00827bb0b7 1200 MEMP_STATS_DEC(err, MEMP_TCP_PCB);
AdamGreen 0:3b00827bb0b7 1201 }
AdamGreen 0:3b00827bb0b7 1202 }
AdamGreen 0:3b00827bb0b7 1203 if (pcb != NULL) {
AdamGreen 0:3b00827bb0b7 1204 /* adjust err stats: timewait PCB was freed above */
AdamGreen 0:3b00827bb0b7 1205 MEMP_STATS_DEC(err, MEMP_TCP_PCB);
AdamGreen 0:3b00827bb0b7 1206 }
AdamGreen 0:3b00827bb0b7 1207 }
AdamGreen 0:3b00827bb0b7 1208 if (pcb != NULL) {
AdamGreen 0:3b00827bb0b7 1209 memset(pcb, 0, sizeof(struct tcp_pcb));
AdamGreen 0:3b00827bb0b7 1210 pcb->prio = prio;
AdamGreen 0:3b00827bb0b7 1211 pcb->snd_buf = TCP_SND_BUF;
AdamGreen 0:3b00827bb0b7 1212 pcb->snd_queuelen = 0;
AdamGreen 0:3b00827bb0b7 1213 pcb->rcv_wnd = TCP_WND;
AdamGreen 0:3b00827bb0b7 1214 pcb->rcv_ann_wnd = TCP_WND;
AdamGreen 0:3b00827bb0b7 1215 pcb->tos = 0;
AdamGreen 0:3b00827bb0b7 1216 pcb->ttl = TCP_TTL;
AdamGreen 0:3b00827bb0b7 1217 /* As initial send MSS, we use TCP_MSS but limit it to 536.
AdamGreen 0:3b00827bb0b7 1218 The send MSS is updated when an MSS option is received. */
AdamGreen 0:3b00827bb0b7 1219 pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
AdamGreen 0:3b00827bb0b7 1220 pcb->rto = 3000 / TCP_SLOW_INTERVAL;
AdamGreen 0:3b00827bb0b7 1221 pcb->sa = 0;
AdamGreen 0:3b00827bb0b7 1222 pcb->sv = 3000 / TCP_SLOW_INTERVAL;
AdamGreen 0:3b00827bb0b7 1223 pcb->rtime = -1;
AdamGreen 0:3b00827bb0b7 1224 pcb->cwnd = 1;
AdamGreen 0:3b00827bb0b7 1225 iss = tcp_next_iss();
AdamGreen 0:3b00827bb0b7 1226 pcb->snd_wl2 = iss;
AdamGreen 0:3b00827bb0b7 1227 pcb->snd_nxt = iss;
AdamGreen 0:3b00827bb0b7 1228 pcb->lastack = iss;
AdamGreen 0:3b00827bb0b7 1229 pcb->snd_lbb = iss;
AdamGreen 0:3b00827bb0b7 1230 pcb->tmr = tcp_ticks;
AdamGreen 0:3b00827bb0b7 1231
AdamGreen 0:3b00827bb0b7 1232 pcb->polltmr = 0;
AdamGreen 0:3b00827bb0b7 1233
AdamGreen 0:3b00827bb0b7 1234 #if LWIP_CALLBACK_API
AdamGreen 0:3b00827bb0b7 1235 pcb->recv = tcp_recv_null;
AdamGreen 0:3b00827bb0b7 1236 #endif /* LWIP_CALLBACK_API */
AdamGreen 0:3b00827bb0b7 1237
AdamGreen 0:3b00827bb0b7 1238 /* Init KEEPALIVE timer */
AdamGreen 0:3b00827bb0b7 1239 pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
AdamGreen 0:3b00827bb0b7 1240
AdamGreen 0:3b00827bb0b7 1241 #if LWIP_TCP_KEEPALIVE
AdamGreen 0:3b00827bb0b7 1242 pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
AdamGreen 0:3b00827bb0b7 1243 pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
AdamGreen 0:3b00827bb0b7 1244 #endif /* LWIP_TCP_KEEPALIVE */
AdamGreen 0:3b00827bb0b7 1245
AdamGreen 0:3b00827bb0b7 1246 pcb->keep_cnt_sent = 0;
AdamGreen 0:3b00827bb0b7 1247 }
AdamGreen 0:3b00827bb0b7 1248 return pcb;
AdamGreen 0:3b00827bb0b7 1249 }
AdamGreen 0:3b00827bb0b7 1250
AdamGreen 0:3b00827bb0b7 1251 /**
AdamGreen 0:3b00827bb0b7 1252 * Creates a new TCP protocol control block but doesn't place it on
AdamGreen 0:3b00827bb0b7 1253 * any of the TCP PCB lists.
AdamGreen 0:3b00827bb0b7 1254 * The pcb is not put on any list until binding using tcp_bind().
AdamGreen 0:3b00827bb0b7 1255 *
AdamGreen 0:3b00827bb0b7 1256 * @internal: Maybe there should be a idle TCP PCB list where these
AdamGreen 0:3b00827bb0b7 1257 * PCBs are put on. Port reservation using tcp_bind() is implemented but
AdamGreen 0:3b00827bb0b7 1258 * allocated pcbs that are not bound can't be killed automatically if wanting
AdamGreen 0:3b00827bb0b7 1259 * to allocate a pcb with higher prio (@see tcp_kill_prio())
AdamGreen 0:3b00827bb0b7 1260 *
AdamGreen 0:3b00827bb0b7 1261 * @return a new tcp_pcb that initially is in state CLOSED
AdamGreen 0:3b00827bb0b7 1262 */
AdamGreen 0:3b00827bb0b7 1263 struct tcp_pcb *
AdamGreen 0:3b00827bb0b7 1264 tcp_new(void)
AdamGreen 0:3b00827bb0b7 1265 {
AdamGreen 0:3b00827bb0b7 1266 return tcp_alloc(TCP_PRIO_NORMAL);
AdamGreen 0:3b00827bb0b7 1267 }
AdamGreen 0:3b00827bb0b7 1268
AdamGreen 0:3b00827bb0b7 1269 /**
AdamGreen 0:3b00827bb0b7 1270 * Used to specify the argument that should be passed callback
AdamGreen 0:3b00827bb0b7 1271 * functions.
AdamGreen 0:3b00827bb0b7 1272 *
AdamGreen 0:3b00827bb0b7 1273 * @param pcb tcp_pcb to set the callback argument
AdamGreen 0:3b00827bb0b7 1274 * @param arg void pointer argument to pass to callback functions
AdamGreen 0:3b00827bb0b7 1275 */
AdamGreen 0:3b00827bb0b7 1276 void
AdamGreen 0:3b00827bb0b7 1277 tcp_arg(struct tcp_pcb *pcb, void *arg)
AdamGreen 0:3b00827bb0b7 1278 {
AdamGreen 0:3b00827bb0b7 1279 pcb->callback_arg = arg;
AdamGreen 0:3b00827bb0b7 1280 }
AdamGreen 0:3b00827bb0b7 1281 #if LWIP_CALLBACK_API
AdamGreen 0:3b00827bb0b7 1282
AdamGreen 0:3b00827bb0b7 1283 /**
AdamGreen 0:3b00827bb0b7 1284 * Used to specify the function that should be called when a TCP
AdamGreen 0:3b00827bb0b7 1285 * connection receives data.
AdamGreen 0:3b00827bb0b7 1286 *
AdamGreen 0:3b00827bb0b7 1287 * @param pcb tcp_pcb to set the recv callback
AdamGreen 0:3b00827bb0b7 1288 * @param recv callback function to call for this pcb when data is received
AdamGreen 0:3b00827bb0b7 1289 */
AdamGreen 0:3b00827bb0b7 1290 void
AdamGreen 0:3b00827bb0b7 1291 tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
AdamGreen 0:3b00827bb0b7 1292 {
AdamGreen 0:3b00827bb0b7 1293 pcb->recv = recv;
AdamGreen 0:3b00827bb0b7 1294 }
AdamGreen 0:3b00827bb0b7 1295
AdamGreen 0:3b00827bb0b7 1296 /**
AdamGreen 0:3b00827bb0b7 1297 * Used to specify the function that should be called when TCP data
AdamGreen 0:3b00827bb0b7 1298 * has been successfully delivered to the remote host.
AdamGreen 0:3b00827bb0b7 1299 *
AdamGreen 0:3b00827bb0b7 1300 * @param pcb tcp_pcb to set the sent callback
AdamGreen 0:3b00827bb0b7 1301 * @param sent callback function to call for this pcb when data is successfully sent
AdamGreen 0:3b00827bb0b7 1302 */
AdamGreen 0:3b00827bb0b7 1303 void
AdamGreen 0:3b00827bb0b7 1304 tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
AdamGreen 0:3b00827bb0b7 1305 {
AdamGreen 0:3b00827bb0b7 1306 pcb->sent = sent;
AdamGreen 0:3b00827bb0b7 1307 }
AdamGreen 0:3b00827bb0b7 1308
AdamGreen 0:3b00827bb0b7 1309 /**
AdamGreen 0:3b00827bb0b7 1310 * Used to specify the function that should be called when a fatal error
AdamGreen 0:3b00827bb0b7 1311 * has occured on the connection.
AdamGreen 0:3b00827bb0b7 1312 *
AdamGreen 0:3b00827bb0b7 1313 * @param pcb tcp_pcb to set the err callback
AdamGreen 0:3b00827bb0b7 1314 * @param err callback function to call for this pcb when a fatal error
AdamGreen 0:3b00827bb0b7 1315 * has occured on the connection
AdamGreen 0:3b00827bb0b7 1316 */
AdamGreen 0:3b00827bb0b7 1317 void
AdamGreen 0:3b00827bb0b7 1318 tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
AdamGreen 0:3b00827bb0b7 1319 {
AdamGreen 0:3b00827bb0b7 1320 pcb->errf = err;
AdamGreen 0:3b00827bb0b7 1321 }
AdamGreen 0:3b00827bb0b7 1322
AdamGreen 0:3b00827bb0b7 1323 /**
AdamGreen 0:3b00827bb0b7 1324 * Used for specifying the function that should be called when a
AdamGreen 0:3b00827bb0b7 1325 * LISTENing connection has been connected to another host.
AdamGreen 0:3b00827bb0b7 1326 *
AdamGreen 0:3b00827bb0b7 1327 * @param pcb tcp_pcb to set the accept callback
AdamGreen 0:3b00827bb0b7 1328 * @param accept callback function to call for this pcb when LISTENing
AdamGreen 0:3b00827bb0b7 1329 * connection has been connected to another host
AdamGreen 0:3b00827bb0b7 1330 */
AdamGreen 0:3b00827bb0b7 1331 void
AdamGreen 0:3b00827bb0b7 1332 tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
AdamGreen 0:3b00827bb0b7 1333 {
AdamGreen 0:3b00827bb0b7 1334 pcb->accept = accept;
AdamGreen 0:3b00827bb0b7 1335 }
AdamGreen 0:3b00827bb0b7 1336 #endif /* LWIP_CALLBACK_API */
AdamGreen 0:3b00827bb0b7 1337
AdamGreen 0:3b00827bb0b7 1338
AdamGreen 0:3b00827bb0b7 1339 /**
AdamGreen 0:3b00827bb0b7 1340 * Used to specify the function that should be called periodically
AdamGreen 0:3b00827bb0b7 1341 * from TCP. The interval is specified in terms of the TCP coarse
AdamGreen 0:3b00827bb0b7 1342 * timer interval, which is called twice a second.
AdamGreen 0:3b00827bb0b7 1343 *
AdamGreen 0:3b00827bb0b7 1344 */
AdamGreen 0:3b00827bb0b7 1345 void
AdamGreen 0:3b00827bb0b7 1346 tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
AdamGreen 0:3b00827bb0b7 1347 {
AdamGreen 0:3b00827bb0b7 1348 #if LWIP_CALLBACK_API
AdamGreen 0:3b00827bb0b7 1349 pcb->poll = poll;
AdamGreen 0:3b00827bb0b7 1350 #else /* LWIP_CALLBACK_API */
AdamGreen 0:3b00827bb0b7 1351 LWIP_UNUSED_ARG(poll);
AdamGreen 0:3b00827bb0b7 1352 #endif /* LWIP_CALLBACK_API */
AdamGreen 0:3b00827bb0b7 1353 pcb->pollinterval = interval;
AdamGreen 0:3b00827bb0b7 1354 }
AdamGreen 0:3b00827bb0b7 1355
AdamGreen 0:3b00827bb0b7 1356 /**
AdamGreen 0:3b00827bb0b7 1357 * Purges a TCP PCB. Removes any buffered data and frees the buffer memory
AdamGreen 0:3b00827bb0b7 1358 * (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
AdamGreen 0:3b00827bb0b7 1359 *
AdamGreen 0:3b00827bb0b7 1360 * @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
AdamGreen 0:3b00827bb0b7 1361 */
AdamGreen 0:3b00827bb0b7 1362 void
AdamGreen 0:3b00827bb0b7 1363 tcp_pcb_purge(struct tcp_pcb *pcb)
AdamGreen 0:3b00827bb0b7 1364 {
AdamGreen 0:3b00827bb0b7 1365 if (pcb->state != CLOSED &&
AdamGreen 0:3b00827bb0b7 1366 pcb->state != TIME_WAIT &&
AdamGreen 0:3b00827bb0b7 1367 pcb->state != LISTEN) {
AdamGreen 0:3b00827bb0b7 1368
AdamGreen 0:3b00827bb0b7 1369 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
AdamGreen 0:3b00827bb0b7 1370
AdamGreen 0:3b00827bb0b7 1371 #if TCP_LISTEN_BACKLOG
AdamGreen 0:3b00827bb0b7 1372 if (pcb->state == SYN_RCVD) {
AdamGreen 0:3b00827bb0b7 1373 /* Need to find the corresponding listen_pcb and decrease its accepts_pending */
AdamGreen 0:3b00827bb0b7 1374 struct tcp_pcb_listen *lpcb;
AdamGreen 0:3b00827bb0b7 1375 LWIP_ASSERT("tcp_pcb_purge: pcb->state == SYN_RCVD but tcp_listen_pcbs is NULL",
AdamGreen 0:3b00827bb0b7 1376 tcp_listen_pcbs.listen_pcbs != NULL);
AdamGreen 0:3b00827bb0b7 1377 for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
AdamGreen 0:3b00827bb0b7 1378 if ((lpcb->local_port == pcb->local_port) &&
AdamGreen 0:3b00827bb0b7 1379 (ip_addr_isany(&lpcb->local_ip) ||
AdamGreen 0:3b00827bb0b7 1380 ip_addr_cmp(&pcb->local_ip, &lpcb->local_ip))) {
AdamGreen 0:3b00827bb0b7 1381 /* port and address of the listen pcb match the timed-out pcb */
AdamGreen 0:3b00827bb0b7 1382 LWIP_ASSERT("tcp_pcb_purge: listen pcb does not have accepts pending",
AdamGreen 0:3b00827bb0b7 1383 lpcb->accepts_pending > 0);
AdamGreen 0:3b00827bb0b7 1384 lpcb->accepts_pending--;
AdamGreen 0:3b00827bb0b7 1385 break;
AdamGreen 0:3b00827bb0b7 1386 }
AdamGreen 0:3b00827bb0b7 1387 }
AdamGreen 0:3b00827bb0b7 1388 }
AdamGreen 0:3b00827bb0b7 1389 #endif /* TCP_LISTEN_BACKLOG */
AdamGreen 0:3b00827bb0b7 1390
AdamGreen 0:3b00827bb0b7 1391
AdamGreen 0:3b00827bb0b7 1392 if (pcb->refused_data != NULL) {
AdamGreen 0:3b00827bb0b7 1393 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
AdamGreen 0:3b00827bb0b7 1394 pbuf_free(pcb->refused_data);
AdamGreen 0:3b00827bb0b7 1395 pcb->refused_data = NULL;
AdamGreen 0:3b00827bb0b7 1396 }
AdamGreen 0:3b00827bb0b7 1397 if (pcb->unsent != NULL) {
AdamGreen 0:3b00827bb0b7 1398 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
AdamGreen 0:3b00827bb0b7 1399 }
AdamGreen 0:3b00827bb0b7 1400 if (pcb->unacked != NULL) {
AdamGreen 0:3b00827bb0b7 1401 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
AdamGreen 0:3b00827bb0b7 1402 }
AdamGreen 0:3b00827bb0b7 1403 #if TCP_QUEUE_OOSEQ
AdamGreen 0:3b00827bb0b7 1404 if (pcb->ooseq != NULL) {
AdamGreen 0:3b00827bb0b7 1405 LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
AdamGreen 0:3b00827bb0b7 1406 }
AdamGreen 0:3b00827bb0b7 1407 tcp_segs_free(pcb->ooseq);
AdamGreen 0:3b00827bb0b7 1408 pcb->ooseq = NULL;
AdamGreen 0:3b00827bb0b7 1409 #endif /* TCP_QUEUE_OOSEQ */
AdamGreen 0:3b00827bb0b7 1410
AdamGreen 0:3b00827bb0b7 1411 /* Stop the retransmission timer as it will expect data on unacked
AdamGreen 0:3b00827bb0b7 1412 queue if it fires */
AdamGreen 0:3b00827bb0b7 1413 pcb->rtime = -1;
AdamGreen 0:3b00827bb0b7 1414
AdamGreen 0:3b00827bb0b7 1415 tcp_segs_free(pcb->unsent);
AdamGreen 0:3b00827bb0b7 1416 tcp_segs_free(pcb->unacked);
AdamGreen 0:3b00827bb0b7 1417 pcb->unacked = pcb->unsent = NULL;
AdamGreen 0:3b00827bb0b7 1418 #if TCP_OVERSIZE
AdamGreen 0:3b00827bb0b7 1419 pcb->unsent_oversize = 0;
AdamGreen 0:3b00827bb0b7 1420 #endif /* TCP_OVERSIZE */
AdamGreen 0:3b00827bb0b7 1421 }
AdamGreen 0:3b00827bb0b7 1422 }
AdamGreen 0:3b00827bb0b7 1423
AdamGreen 0:3b00827bb0b7 1424 /**
AdamGreen 0:3b00827bb0b7 1425 * Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
AdamGreen 0:3b00827bb0b7 1426 *
AdamGreen 0:3b00827bb0b7 1427 * @param pcblist PCB list to purge.
AdamGreen 0:3b00827bb0b7 1428 * @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
AdamGreen 0:3b00827bb0b7 1429 */
AdamGreen 0:3b00827bb0b7 1430 void
AdamGreen 0:3b00827bb0b7 1431 tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb)
AdamGreen 0:3b00827bb0b7 1432 {
AdamGreen 0:3b00827bb0b7 1433 TCP_RMV(pcblist, pcb);
AdamGreen 0:3b00827bb0b7 1434
AdamGreen 0:3b00827bb0b7 1435 tcp_pcb_purge(pcb);
AdamGreen 0:3b00827bb0b7 1436
AdamGreen 0:3b00827bb0b7 1437 /* if there is an outstanding delayed ACKs, send it */
AdamGreen 0:3b00827bb0b7 1438 if (pcb->state != TIME_WAIT &&
AdamGreen 0:3b00827bb0b7 1439 pcb->state != LISTEN &&
AdamGreen 0:3b00827bb0b7 1440 pcb->flags & TF_ACK_DELAY) {
AdamGreen 0:3b00827bb0b7 1441 pcb->flags |= TF_ACK_NOW;
AdamGreen 0:3b00827bb0b7 1442 tcp_output(pcb);
AdamGreen 0:3b00827bb0b7 1443 }
AdamGreen 0:3b00827bb0b7 1444
AdamGreen 0:3b00827bb0b7 1445 if (pcb->state != LISTEN) {
AdamGreen 0:3b00827bb0b7 1446 LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
AdamGreen 0:3b00827bb0b7 1447 LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
AdamGreen 0:3b00827bb0b7 1448 #if TCP_QUEUE_OOSEQ
AdamGreen 0:3b00827bb0b7 1449 LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
AdamGreen 0:3b00827bb0b7 1450 #endif /* TCP_QUEUE_OOSEQ */
AdamGreen 0:3b00827bb0b7 1451 }
AdamGreen 0:3b00827bb0b7 1452
AdamGreen 0:3b00827bb0b7 1453 pcb->state = CLOSED;
AdamGreen 0:3b00827bb0b7 1454
AdamGreen 0:3b00827bb0b7 1455 LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
AdamGreen 0:3b00827bb0b7 1456 }
AdamGreen 0:3b00827bb0b7 1457
AdamGreen 0:3b00827bb0b7 1458 /**
AdamGreen 0:3b00827bb0b7 1459 * Calculates a new initial sequence number for new connections.
AdamGreen 0:3b00827bb0b7 1460 *
AdamGreen 0:3b00827bb0b7 1461 * @return u32_t pseudo random sequence number
AdamGreen 0:3b00827bb0b7 1462 */
AdamGreen 0:3b00827bb0b7 1463 u32_t
AdamGreen 0:3b00827bb0b7 1464 tcp_next_iss(void)
AdamGreen 0:3b00827bb0b7 1465 {
AdamGreen 0:3b00827bb0b7 1466 static u32_t iss = 6510;
AdamGreen 0:3b00827bb0b7 1467
AdamGreen 0:3b00827bb0b7 1468 iss += tcp_ticks; /* XXX */
AdamGreen 0:3b00827bb0b7 1469 return iss;
AdamGreen 0:3b00827bb0b7 1470 }
AdamGreen 0:3b00827bb0b7 1471
AdamGreen 0:3b00827bb0b7 1472 #if TCP_CALCULATE_EFF_SEND_MSS
AdamGreen 0:3b00827bb0b7 1473 /**
AdamGreen 0:3b00827bb0b7 1474 * Calcluates the effective send mss that can be used for a specific IP address
AdamGreen 0:3b00827bb0b7 1475 * by using ip_route to determin the netif used to send to the address and
AdamGreen 0:3b00827bb0b7 1476 * calculating the minimum of TCP_MSS and that netif's mtu (if set).
AdamGreen 0:3b00827bb0b7 1477 */
AdamGreen 0:3b00827bb0b7 1478 u16_t
AdamGreen 0:3b00827bb0b7 1479 tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr)
AdamGreen 0:3b00827bb0b7 1480 {
AdamGreen 0:3b00827bb0b7 1481 u16_t mss_s;
AdamGreen 0:3b00827bb0b7 1482 struct netif *outif;
AdamGreen 0:3b00827bb0b7 1483
AdamGreen 0:3b00827bb0b7 1484 outif = ip_route(addr);
AdamGreen 0:3b00827bb0b7 1485 if ((outif != NULL) && (outif->mtu != 0)) {
AdamGreen 0:3b00827bb0b7 1486 mss_s = outif->mtu - IP_HLEN - TCP_HLEN;
AdamGreen 0:3b00827bb0b7 1487 /* RFC 1122, chap 4.2.2.6:
AdamGreen 0:3b00827bb0b7 1488 * Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
AdamGreen 0:3b00827bb0b7 1489 * We correct for TCP options in tcp_write(), and don't support IP options.
AdamGreen 0:3b00827bb0b7 1490 */
AdamGreen 0:3b00827bb0b7 1491 sendmss = LWIP_MIN(sendmss, mss_s);
AdamGreen 0:3b00827bb0b7 1492 }
AdamGreen 0:3b00827bb0b7 1493 return sendmss;
AdamGreen 0:3b00827bb0b7 1494 }
AdamGreen 0:3b00827bb0b7 1495 #endif /* TCP_CALCULATE_EFF_SEND_MSS */
AdamGreen 0:3b00827bb0b7 1496
AdamGreen 0:3b00827bb0b7 1497 const char*
AdamGreen 0:3b00827bb0b7 1498 tcp_debug_state_str(enum tcp_state s)
AdamGreen 0:3b00827bb0b7 1499 {
AdamGreen 0:3b00827bb0b7 1500 return tcp_state_str[s];
AdamGreen 0:3b00827bb0b7 1501 }
AdamGreen 0:3b00827bb0b7 1502
AdamGreen 0:3b00827bb0b7 1503 #if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
AdamGreen 0:3b00827bb0b7 1504 /**
AdamGreen 0:3b00827bb0b7 1505 * Print a tcp header for debugging purposes.
AdamGreen 0:3b00827bb0b7 1506 *
AdamGreen 0:3b00827bb0b7 1507 * @param tcphdr pointer to a struct tcp_hdr
AdamGreen 0:3b00827bb0b7 1508 */
AdamGreen 0:3b00827bb0b7 1509 void
AdamGreen 0:3b00827bb0b7 1510 tcp_debug_print(struct tcp_hdr *tcphdr)
AdamGreen 0:3b00827bb0b7 1511 {
AdamGreen 0:3b00827bb0b7 1512 LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
AdamGreen 0:3b00827bb0b7 1513 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
AdamGreen 0:3b00827bb0b7 1514 LWIP_DEBUGF(TCP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
AdamGreen 0:3b00827bb0b7 1515 ntohs(tcphdr->src), ntohs(tcphdr->dest)));
AdamGreen 0:3b00827bb0b7 1516 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
AdamGreen 0:3b00827bb0b7 1517 LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (seq no)\n",
AdamGreen 0:3b00827bb0b7 1518 ntohl(tcphdr->seqno)));
AdamGreen 0:3b00827bb0b7 1519 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
AdamGreen 0:3b00827bb0b7 1520 LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (ack no)\n",
AdamGreen 0:3b00827bb0b7 1521 ntohl(tcphdr->ackno)));
AdamGreen 0:3b00827bb0b7 1522 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
AdamGreen 0:3b00827bb0b7 1523 LWIP_DEBUGF(TCP_DEBUG, ("| %2"U16_F" | |%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"| %5"U16_F" | (hdrlen, flags (",
AdamGreen 0:3b00827bb0b7 1524 TCPH_HDRLEN(tcphdr),
AdamGreen 0:3b00827bb0b7 1525 TCPH_FLAGS(tcphdr) >> 5 & 1,
AdamGreen 0:3b00827bb0b7 1526 TCPH_FLAGS(tcphdr) >> 4 & 1,
AdamGreen 0:3b00827bb0b7 1527 TCPH_FLAGS(tcphdr) >> 3 & 1,
AdamGreen 0:3b00827bb0b7 1528 TCPH_FLAGS(tcphdr) >> 2 & 1,
AdamGreen 0:3b00827bb0b7 1529 TCPH_FLAGS(tcphdr) >> 1 & 1,
AdamGreen 0:3b00827bb0b7 1530 TCPH_FLAGS(tcphdr) & 1,
AdamGreen 0:3b00827bb0b7 1531 ntohs(tcphdr->wnd)));
AdamGreen 0:3b00827bb0b7 1532 tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
AdamGreen 0:3b00827bb0b7 1533 LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
AdamGreen 0:3b00827bb0b7 1534 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
AdamGreen 0:3b00827bb0b7 1535 LWIP_DEBUGF(TCP_DEBUG, ("| 0x%04"X16_F" | %5"U16_F" | (chksum, urgp)\n",
AdamGreen 0:3b00827bb0b7 1536 ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
AdamGreen 0:3b00827bb0b7 1537 LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
AdamGreen 0:3b00827bb0b7 1538 }
AdamGreen 0:3b00827bb0b7 1539
AdamGreen 0:3b00827bb0b7 1540 /**
AdamGreen 0:3b00827bb0b7 1541 * Print a tcp state for debugging purposes.
AdamGreen 0:3b00827bb0b7 1542 *
AdamGreen 0:3b00827bb0b7 1543 * @param s enum tcp_state to print
AdamGreen 0:3b00827bb0b7 1544 */
AdamGreen 0:3b00827bb0b7 1545 void
AdamGreen 0:3b00827bb0b7 1546 tcp_debug_print_state(enum tcp_state s)
AdamGreen 0:3b00827bb0b7 1547 {
AdamGreen 0:3b00827bb0b7 1548 LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
AdamGreen 0:3b00827bb0b7 1549 }
AdamGreen 0:3b00827bb0b7 1550
AdamGreen 0:3b00827bb0b7 1551 /**
AdamGreen 0:3b00827bb0b7 1552 * Print tcp flags for debugging purposes.
AdamGreen 0:3b00827bb0b7 1553 *
AdamGreen 0:3b00827bb0b7 1554 * @param flags tcp flags, all active flags are printed
AdamGreen 0:3b00827bb0b7 1555 */
AdamGreen 0:3b00827bb0b7 1556 void
AdamGreen 0:3b00827bb0b7 1557 tcp_debug_print_flags(u8_t flags)
AdamGreen 0:3b00827bb0b7 1558 {
AdamGreen 0:3b00827bb0b7 1559 if (flags & TCP_FIN) {
AdamGreen 0:3b00827bb0b7 1560 LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
AdamGreen 0:3b00827bb0b7 1561 }
AdamGreen 0:3b00827bb0b7 1562 if (flags & TCP_SYN) {
AdamGreen 0:3b00827bb0b7 1563 LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
AdamGreen 0:3b00827bb0b7 1564 }
AdamGreen 0:3b00827bb0b7 1565 if (flags & TCP_RST) {
AdamGreen 0:3b00827bb0b7 1566 LWIP_DEBUGF(TCP_DEBUG, ("RST "));
AdamGreen 0:3b00827bb0b7 1567 }
AdamGreen 0:3b00827bb0b7 1568 if (flags & TCP_PSH) {
AdamGreen 0:3b00827bb0b7 1569 LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
AdamGreen 0:3b00827bb0b7 1570 }
AdamGreen 0:3b00827bb0b7 1571 if (flags & TCP_ACK) {
AdamGreen 0:3b00827bb0b7 1572 LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
AdamGreen 0:3b00827bb0b7 1573 }
AdamGreen 0:3b00827bb0b7 1574 if (flags & TCP_URG) {
AdamGreen 0:3b00827bb0b7 1575 LWIP_DEBUGF(TCP_DEBUG, ("URG "));
AdamGreen 0:3b00827bb0b7 1576 }
AdamGreen 0:3b00827bb0b7 1577 if (flags & TCP_ECE) {
AdamGreen 0:3b00827bb0b7 1578 LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
AdamGreen 0:3b00827bb0b7 1579 }
AdamGreen 0:3b00827bb0b7 1580 if (flags & TCP_CWR) {
AdamGreen 0:3b00827bb0b7 1581 LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
AdamGreen 0:3b00827bb0b7 1582 }
AdamGreen 0:3b00827bb0b7 1583 LWIP_DEBUGF(TCP_DEBUG, ("\n"));
AdamGreen 0:3b00827bb0b7 1584 }
AdamGreen 0:3b00827bb0b7 1585
AdamGreen 0:3b00827bb0b7 1586 /**
AdamGreen 0:3b00827bb0b7 1587 * Print all tcp_pcbs in every list for debugging purposes.
AdamGreen 0:3b00827bb0b7 1588 */
AdamGreen 0:3b00827bb0b7 1589 void
AdamGreen 0:3b00827bb0b7 1590 tcp_debug_print_pcbs(void)
AdamGreen 0:3b00827bb0b7 1591 {
AdamGreen 0:3b00827bb0b7 1592 struct tcp_pcb *pcb;
AdamGreen 0:3b00827bb0b7 1593 LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
AdamGreen 0:3b00827bb0b7 1594 for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
AdamGreen 0:3b00827bb0b7 1595 LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
AdamGreen 0:3b00827bb0b7 1596 pcb->local_port, pcb->remote_port,
AdamGreen 0:3b00827bb0b7 1597 pcb->snd_nxt, pcb->rcv_nxt));
AdamGreen 0:3b00827bb0b7 1598 tcp_debug_print_state(pcb->state);
AdamGreen 0:3b00827bb0b7 1599 }
AdamGreen 0:3b00827bb0b7 1600 LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
AdamGreen 0:3b00827bb0b7 1601 for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
AdamGreen 0:3b00827bb0b7 1602 LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
AdamGreen 0:3b00827bb0b7 1603 pcb->local_port, pcb->remote_port,
AdamGreen 0:3b00827bb0b7 1604 pcb->snd_nxt, pcb->rcv_nxt));
AdamGreen 0:3b00827bb0b7 1605 tcp_debug_print_state(pcb->state);
AdamGreen 0:3b00827bb0b7 1606 }
AdamGreen 0:3b00827bb0b7 1607 LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
AdamGreen 0:3b00827bb0b7 1608 for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
AdamGreen 0:3b00827bb0b7 1609 LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
AdamGreen 0:3b00827bb0b7 1610 pcb->local_port, pcb->remote_port,
AdamGreen 0:3b00827bb0b7 1611 pcb->snd_nxt, pcb->rcv_nxt));
AdamGreen 0:3b00827bb0b7 1612 tcp_debug_print_state(pcb->state);
AdamGreen 0:3b00827bb0b7 1613 }
AdamGreen 0:3b00827bb0b7 1614 }
AdamGreen 0:3b00827bb0b7 1615
AdamGreen 0:3b00827bb0b7 1616 /**
AdamGreen 0:3b00827bb0b7 1617 * Check state consistency of the tcp_pcb lists.
AdamGreen 0:3b00827bb0b7 1618 */
AdamGreen 0:3b00827bb0b7 1619 s16_t
AdamGreen 0:3b00827bb0b7 1620 tcp_pcbs_sane(void)
AdamGreen 0:3b00827bb0b7 1621 {
AdamGreen 0:3b00827bb0b7 1622 struct tcp_pcb *pcb;
AdamGreen 0:3b00827bb0b7 1623 for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
AdamGreen 0:3b00827bb0b7 1624 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
AdamGreen 0:3b00827bb0b7 1625 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
AdamGreen 0:3b00827bb0b7 1626 LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
AdamGreen 0:3b00827bb0b7 1627 }
AdamGreen 0:3b00827bb0b7 1628 for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
AdamGreen 0:3b00827bb0b7 1629 LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
AdamGreen 0:3b00827bb0b7 1630 }
AdamGreen 0:3b00827bb0b7 1631 return 1;
AdamGreen 0:3b00827bb0b7 1632 }
AdamGreen 0:3b00827bb0b7 1633 #endif /* TCP_DEBUG */
AdamGreen 0:3b00827bb0b7 1634
AdamGreen 0:3b00827bb0b7 1635 #endif /* LWIP_TCP */