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jeremybenn |
/**
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* @file
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*
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* Transmission Control Protocol for IP
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*
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* This file contains common functions for the TCP implementation, such as functinos
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* for manipulating the data structures and the TCP timer functions. TCP functions
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* related to input and output is found in tcp_in.c and tcp_out.c respectively.
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*
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*/
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/*
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* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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#include <string.h>
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#include "lwip/opt.h"
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#include "lwip/def.h"
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#include "lwip/mem.h"
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#include "lwip/memp.h"
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#include "lwip/tcp.h"
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#if LWIP_TCP
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/* Incremented every coarse grained timer shot
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(typically every 500 ms, determined by TCP_COARSE_TIMEOUT). */
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u32_t tcp_ticks;
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const u8_t tcp_backoff[13] =
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{ 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
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/* The TCP PCB lists. */
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/** List of all TCP PCBs in LISTEN state */
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union tcp_listen_pcbs_t tcp_listen_pcbs;
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/** List of all TCP PCBs that are in a state in which
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* they accept or send data. */
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struct tcp_pcb *tcp_active_pcbs;
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/** List of all TCP PCBs in TIME-WAIT state */
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struct tcp_pcb *tcp_tw_pcbs;
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struct tcp_pcb *tcp_tmp_pcb;
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static u8_t tcp_timer;
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static u16_t tcp_new_port(void);
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/**
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* Initializes the TCP layer.
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*/
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void
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tcp_init(void)
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{
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/* Clear globals. */
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tcp_listen_pcbs.listen_pcbs = NULL;
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tcp_active_pcbs = NULL;
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tcp_tw_pcbs = NULL;
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tcp_tmp_pcb = NULL;
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/* initialize timer */
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tcp_ticks = 0;
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tcp_timer = 0;
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}
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/**
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* Called periodically to dispatch TCP timers.
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*
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*/
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void
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tcp_tmr(void)
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{
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/* Call tcp_fasttmr() every 250 ms */
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tcp_fasttmr();
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if (++tcp_timer & 1) {
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/* Call tcp_tmr() every 500 ms, i.e., every other timer
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tcp_tmr() is called. */
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tcp_slowtmr();
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}
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}
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/**
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* Closes the connection held by the PCB.
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*
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*/
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err_t
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tcp_close(struct tcp_pcb *pcb)
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{
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err_t err;
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#if TCP_DEBUG
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LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in state "));
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tcp_debug_print_state(pcb->state);
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LWIP_DEBUGF(TCP_DEBUG, ("\n"));
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#endif /* TCP_DEBUG */
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switch (pcb->state) {
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case CLOSED:
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/* Closing a pcb in the CLOSED state might seem erroneous,
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* however, it is in this state once allocated and as yet unused
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* and the user needs some way to free it should the need arise.
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* Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
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* or for a pcb that has been used and then entered the CLOSED state
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* is erroneous, but this should never happen as the pcb has in those cases
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* been freed, and so any remaining handles are bogus. */
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err = ERR_OK;
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memp_free(MEMP_TCP_PCB, pcb);
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pcb = NULL;
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break;
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case LISTEN:
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err = ERR_OK;
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tcp_pcb_remove((struct tcp_pcb **)&tcp_listen_pcbs.pcbs, pcb);
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memp_free(MEMP_TCP_PCB_LISTEN, pcb);
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pcb = NULL;
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break;
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case SYN_SENT:
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err = ERR_OK;
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tcp_pcb_remove(&tcp_active_pcbs, pcb);
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memp_free(MEMP_TCP_PCB, pcb);
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pcb = NULL;
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break;
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case SYN_RCVD:
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case ESTABLISHED:
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err = tcp_send_ctrl(pcb, TCP_FIN);
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if (err == ERR_OK) {
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pcb->state = FIN_WAIT_1;
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}
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break;
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case CLOSE_WAIT:
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err = tcp_send_ctrl(pcb, TCP_FIN);
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if (err == ERR_OK) {
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pcb->state = LAST_ACK;
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}
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break;
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default:
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/* Has already been closed, do nothing. */
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err = ERR_OK;
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pcb = NULL;
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break;
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}
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if (pcb != NULL && err == ERR_OK) {
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err = tcp_output(pcb);
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}
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return err;
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}
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/**
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* Aborts a connection by sending a RST to the remote host and deletes
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* the local protocol control block. This is done when a connection is
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* killed because of shortage of memory.
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*
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*/
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void
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tcp_abort(struct tcp_pcb *pcb)
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{
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u32_t seqno, ackno;
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u16_t remote_port, local_port;
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struct ip_addr remote_ip, local_ip;
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#if LWIP_CALLBACK_API
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void (* errf)(void *arg, err_t err);
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#endif /* LWIP_CALLBACK_API */
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void *errf_arg;
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/* Figure out on which TCP PCB list we are, and remove us. If we
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are in an active state, call the receive function associated with
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the PCB with a NULL argument, and send an RST to the remote end. */
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if (pcb->state == TIME_WAIT) {
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tcp_pcb_remove(&tcp_tw_pcbs, pcb);
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memp_free(MEMP_TCP_PCB, pcb);
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} else {
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seqno = pcb->snd_nxt;
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ackno = pcb->rcv_nxt;
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ip_addr_set(&local_ip, &(pcb->local_ip));
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ip_addr_set(&remote_ip, &(pcb->remote_ip));
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local_port = pcb->local_port;
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remote_port = pcb->remote_port;
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#if LWIP_CALLBACK_API
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errf = pcb->errf;
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#endif /* LWIP_CALLBACK_API */
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errf_arg = pcb->callback_arg;
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tcp_pcb_remove(&tcp_active_pcbs, pcb);
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if (pcb->unacked != NULL) {
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tcp_segs_free(pcb->unacked);
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}
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if (pcb->unsent != NULL) {
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tcp_segs_free(pcb->unsent);
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}
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#if TCP_QUEUE_OOSEQ
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if (pcb->ooseq != NULL) {
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tcp_segs_free(pcb->ooseq);
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}
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#endif /* TCP_QUEUE_OOSEQ */
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memp_free(MEMP_TCP_PCB, pcb);
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TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
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LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abort: sending RST\n"));
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tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port);
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}
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}
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/**
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* Binds the connection to a local portnumber and IP address. If the
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* IP address is not given (i.e., ipaddr == NULL), the IP address of
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* the outgoing network interface is used instead.
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*
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*/
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err_t
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tcp_bind(struct tcp_pcb *pcb, struct ip_addr *ipaddr, u16_t port)
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{
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struct tcp_pcb *cpcb;
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#if SO_REUSE
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int reuse_port_all_set = 1;
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#endif /* SO_REUSE */
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if (port == 0) {
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port = tcp_new_port();
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}
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#if SO_REUSE == 0
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/* Check if the address already is in use. */
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for(cpcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs;
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cpcb != NULL; cpcb = cpcb->next) {
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if (cpcb->local_port == port) {
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if (ip_addr_isany(&(cpcb->local_ip)) ||
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ip_addr_isany(ipaddr) ||
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ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
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return ERR_USE;
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}
|
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}
|
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}
|
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for(cpcb = tcp_active_pcbs;
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cpcb != NULL; cpcb = cpcb->next) {
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if (cpcb->local_port == port) {
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if (ip_addr_isany(&(cpcb->local_ip)) ||
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ip_addr_isany(ipaddr) ||
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ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
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return ERR_USE;
|
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}
|
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}
|
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}
|
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#else /* SO_REUSE */
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/* Search through list of PCB's in LISTEN state.
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|
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If there is a PCB bound to specified port and IP_ADDR_ANY another PCB can be bound to the interface IP
|
273 |
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or to the loopback address on the same port if SOF_REUSEADDR is set. Any combination of PCB's bound to
|
274 |
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the same local port, but to one address out of {IP_ADDR_ANY, 127.0.0.1, interface IP} at a time is valid.
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But no two PCB's bound to same local port and same local address is valid.
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|
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If SOF_REUSEPORT is set several PCB's can be bound to same local port and same local address also. But then
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all PCB's must have the SOF_REUSEPORT option set.
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|
280 |
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When the two options aren't set and specified port is already bound, ERR_USE is returned saying that
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281 |
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address is already in use. */
|
282 |
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for(cpcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; cpcb != NULL; cpcb = cpcb->next) {
|
283 |
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if(cpcb->local_port == port) {
|
284 |
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if(ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
|
285 |
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if(pcb->so_options & SOF_REUSEPORT) {
|
286 |
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LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: in listening PCB's: SO_REUSEPORT set and same address.\n"));
|
287 |
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reuse_port_all_set = (reuse_port_all_set && (cpcb->so_options & SOF_REUSEPORT));
|
288 |
|
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}
|
289 |
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else {
|
290 |
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LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: in listening PCB's: SO_REUSEPORT not set and same address.\n"));
|
291 |
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return ERR_USE;
|
292 |
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}
|
293 |
|
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}
|
294 |
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else if((ip_addr_isany(ipaddr) && !ip_addr_isany(&(cpcb->local_ip))) ||
|
295 |
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(!ip_addr_isany(ipaddr) && ip_addr_isany(&(cpcb->local_ip)))) {
|
296 |
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if(!(pcb->so_options & SOF_REUSEADDR) && !(pcb->so_options & SOF_REUSEPORT)) {
|
297 |
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LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: in listening PCB's SO_REUSEPORT or SO_REUSEADDR not set and not the same address.\n"));
|
298 |
|
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return ERR_USE;
|
299 |
|
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}
|
300 |
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else {
|
301 |
|
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LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: in listening PCB's SO_REUSEPORT or SO_REUSEADDR set and not the same address.\n"));
|
302 |
|
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}
|
303 |
|
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}
|
304 |
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}
|
305 |
|
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}
|
306 |
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|
307 |
|
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/* Search through list of PCB's in a state in which they can accept or send data. Same decription as for
|
308 |
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PCB's in state LISTEN applies to this PCB's regarding the options SOF_REUSEADDR and SOF_REUSEPORT. */
|
309 |
|
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for(cpcb = tcp_active_pcbs; cpcb != NULL; cpcb = cpcb->next) {
|
310 |
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if(cpcb->local_port == port) {
|
311 |
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if(ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
|
312 |
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if(pcb->so_options & SOF_REUSEPORT) {
|
313 |
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LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: in active PCB's SO_REUSEPORT set and same address.\n"));
|
314 |
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reuse_port_all_set = (reuse_port_all_set && (cpcb->so_options & SOF_REUSEPORT));
|
315 |
|
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}
|
316 |
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else {
|
317 |
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LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: in active PCB's SO_REUSEPORT not set and same address.\n"));
|
318 |
|
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return ERR_USE;
|
319 |
|
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}
|
320 |
|
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}
|
321 |
|
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else if((ip_addr_isany(ipaddr) && !ip_addr_isany(&(cpcb->local_ip))) ||
|
322 |
|
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(!ip_addr_isany(ipaddr) && ip_addr_isany(&(cpcb->local_ip)))) {
|
323 |
|
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if(!(pcb->so_options & SOF_REUSEADDR) && !(pcb->so_options & SOF_REUSEPORT)) {
|
324 |
|
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LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: in active PCB's SO_REUSEPORT or SO_REUSEADDR not set and not the same address.\n"));
|
325 |
|
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return ERR_USE;
|
326 |
|
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}
|
327 |
|
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else {
|
328 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: in active PCB's SO_REUSEPORT or SO_REUSEADDR set and not the same address.\n"));
|
329 |
|
|
}
|
330 |
|
|
}
|
331 |
|
|
}
|
332 |
|
|
}
|
333 |
|
|
|
334 |
|
|
/* Search through list of PCB's in TIME_WAIT state. If SO_REUSEADDR is set a bound combination [IP, port}
|
335 |
|
|
can be rebound. The same applies when SOF_REUSEPORT is set.
|
336 |
|
|
|
337 |
|
|
If SOF_REUSEPORT is set several PCB's can be bound to same local port and same local address also. But then
|
338 |
|
|
all PCB's must have the SOF_REUSEPORT option set.
|
339 |
|
|
|
340 |
|
|
When the two options aren't set and specified port is already bound, ERR_USE is returned saying that
|
341 |
|
|
address is already in use. */
|
342 |
|
|
for(cpcb = tcp_tw_pcbs; cpcb != NULL; cpcb = cpcb->next) {
|
343 |
|
|
if(cpcb->local_port == port) {
|
344 |
|
|
if(ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
|
345 |
|
|
if(!(pcb->so_options & SOF_REUSEADDR) && !(pcb->so_options & SOF_REUSEPORT)) {
|
346 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: in TIME_WAIT PCB's SO_REUSEPORT or SO_REUSEADDR not set and same address.\n"));
|
347 |
|
|
return ERR_USE;
|
348 |
|
|
}
|
349 |
|
|
else if(pcb->so_options & SOF_REUSEPORT) {
|
350 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: in TIME_WAIT PCB's SO_REUSEPORT set and same address.\n"));
|
351 |
|
|
reuse_port_all_set = (reuse_port_all_set && (cpcb->so_options & SOF_REUSEPORT));
|
352 |
|
|
}
|
353 |
|
|
}
|
354 |
|
|
}
|
355 |
|
|
}
|
356 |
|
|
|
357 |
|
|
/* If SOF_REUSEPORT isn't set in all PCB's bound to specified port and local address specified then
|
358 |
|
|
{IP, port} can't be reused. */
|
359 |
|
|
if(!reuse_port_all_set) {
|
360 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: not all sockets have SO_REUSEPORT set.\n"));
|
361 |
|
|
return ERR_USE;
|
362 |
|
|
}
|
363 |
|
|
#endif /* SO_REUSE */
|
364 |
|
|
|
365 |
|
|
if (!ip_addr_isany(ipaddr)) {
|
366 |
|
|
pcb->local_ip = *ipaddr;
|
367 |
|
|
}
|
368 |
|
|
pcb->local_port = port;
|
369 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %u\n", port));
|
370 |
|
|
return ERR_OK;
|
371 |
|
|
}
|
372 |
|
|
#if LWIP_CALLBACK_API
|
373 |
|
|
static err_t
|
374 |
|
|
tcp_accept_null(void *arg, struct tcp_pcb *pcb, err_t err)
|
375 |
|
|
{
|
376 |
|
|
(void)arg;
|
377 |
|
|
(void)pcb;
|
378 |
|
|
(void)err;
|
379 |
|
|
|
380 |
|
|
return ERR_ABRT;
|
381 |
|
|
}
|
382 |
|
|
#endif /* LWIP_CALLBACK_API */
|
383 |
|
|
|
384 |
|
|
/**
|
385 |
|
|
* Set the state of the connection to be LISTEN, which means that it
|
386 |
|
|
* is able to accept incoming connections. The protocol control block
|
387 |
|
|
* is reallocated in order to consume less memory. Setting the
|
388 |
|
|
* connection to LISTEN is an irreversible process.
|
389 |
|
|
*
|
390 |
|
|
*/
|
391 |
|
|
struct tcp_pcb *
|
392 |
|
|
tcp_listen(struct tcp_pcb *pcb)
|
393 |
|
|
{
|
394 |
|
|
struct tcp_pcb_listen *lpcb;
|
395 |
|
|
|
396 |
|
|
/* already listening? */
|
397 |
|
|
if (pcb->state == LISTEN) {
|
398 |
|
|
return pcb;
|
399 |
|
|
}
|
400 |
|
|
lpcb = memp_malloc(MEMP_TCP_PCB_LISTEN);
|
401 |
|
|
if (lpcb == NULL) {
|
402 |
|
|
return NULL;
|
403 |
|
|
}
|
404 |
|
|
lpcb->callback_arg = pcb->callback_arg;
|
405 |
|
|
lpcb->local_port = pcb->local_port;
|
406 |
|
|
lpcb->state = LISTEN;
|
407 |
|
|
lpcb->so_options = pcb->so_options;
|
408 |
|
|
lpcb->so_options |= SOF_ACCEPTCONN;
|
409 |
|
|
lpcb->ttl = pcb->ttl;
|
410 |
|
|
lpcb->tos = pcb->tos;
|
411 |
|
|
ip_addr_set(&lpcb->local_ip, &pcb->local_ip);
|
412 |
|
|
memp_free(MEMP_TCP_PCB, pcb);
|
413 |
|
|
#if LWIP_CALLBACK_API
|
414 |
|
|
lpcb->accept = tcp_accept_null;
|
415 |
|
|
#endif /* LWIP_CALLBACK_API */
|
416 |
|
|
TCP_REG(&tcp_listen_pcbs.listen_pcbs, lpcb);
|
417 |
|
|
return (struct tcp_pcb *)lpcb;
|
418 |
|
|
}
|
419 |
|
|
|
420 |
|
|
/**
|
421 |
|
|
* This function should be called by the application when it has
|
422 |
|
|
* processed the data. The purpose is to advertise a larger window
|
423 |
|
|
* when the data has been processed.
|
424 |
|
|
*
|
425 |
|
|
*/
|
426 |
|
|
void
|
427 |
|
|
tcp_recved(struct tcp_pcb *pcb, u16_t len)
|
428 |
|
|
{
|
429 |
|
|
if ((u32_t)pcb->rcv_wnd + len > TCP_WND) {
|
430 |
|
|
pcb->rcv_wnd = TCP_WND;
|
431 |
|
|
} else {
|
432 |
|
|
pcb->rcv_wnd += len;
|
433 |
|
|
}
|
434 |
|
|
if (!(pcb->flags & TF_ACK_DELAY) &&
|
435 |
|
|
!(pcb->flags & TF_ACK_NOW)) {
|
436 |
|
|
/*
|
437 |
|
|
* We send an ACK here (if one is not already pending, hence
|
438 |
|
|
* the above tests) as tcp_recved() implies that the application
|
439 |
|
|
* has processed some data, and so we can open the receiver's
|
440 |
|
|
* window to allow more to be transmitted. This could result in
|
441 |
|
|
* two ACKs being sent for each received packet in some limited cases
|
442 |
|
|
* (where the application is only receiving data, and is slow to
|
443 |
|
|
* process it) but it is necessary to guarantee that the sender can
|
444 |
|
|
* continue to transmit.
|
445 |
|
|
*/
|
446 |
|
|
tcp_ack(pcb);
|
447 |
|
|
}
|
448 |
|
|
else if (pcb->flags & TF_ACK_DELAY && pcb->rcv_wnd >= TCP_WND/2) {
|
449 |
|
|
/* If we can send a window update such that there is a full
|
450 |
|
|
* segment available in the window, do so now. This is sort of
|
451 |
|
|
* nagle-like in its goals, and tries to hit a compromise between
|
452 |
|
|
* sending acks each time the window is updated, and only sending
|
453 |
|
|
* window updates when a timer expires. The "threshold" used
|
454 |
|
|
* above (currently TCP_WND/2) can be tuned to be more or less
|
455 |
|
|
* aggressive */
|
456 |
|
|
tcp_ack_now(pcb);
|
457 |
|
|
}
|
458 |
|
|
|
459 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %u bytes, wnd %u (%u).\n",
|
460 |
|
|
len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
|
461 |
|
|
}
|
462 |
|
|
|
463 |
|
|
/**
|
464 |
|
|
* A nastly hack featuring 'goto' statements that allocates a
|
465 |
|
|
* new TCP local port.
|
466 |
|
|
*/
|
467 |
|
|
static u16_t
|
468 |
|
|
tcp_new_port(void)
|
469 |
|
|
{
|
470 |
|
|
struct tcp_pcb *pcb;
|
471 |
|
|
#ifndef TCP_LOCAL_PORT_RANGE_START
|
472 |
|
|
#define TCP_LOCAL_PORT_RANGE_START 4096
|
473 |
|
|
#define TCP_LOCAL_PORT_RANGE_END 0x7fff
|
474 |
|
|
#endif
|
475 |
|
|
static u16_t port = TCP_LOCAL_PORT_RANGE_START;
|
476 |
|
|
|
477 |
|
|
again:
|
478 |
|
|
if (++port > TCP_LOCAL_PORT_RANGE_END) {
|
479 |
|
|
port = TCP_LOCAL_PORT_RANGE_START;
|
480 |
|
|
}
|
481 |
|
|
|
482 |
|
|
for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
|
483 |
|
|
if (pcb->local_port == port) {
|
484 |
|
|
goto again;
|
485 |
|
|
}
|
486 |
|
|
}
|
487 |
|
|
for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
|
488 |
|
|
if (pcb->local_port == port) {
|
489 |
|
|
goto again;
|
490 |
|
|
}
|
491 |
|
|
}
|
492 |
|
|
for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
|
493 |
|
|
if (pcb->local_port == port) {
|
494 |
|
|
goto again;
|
495 |
|
|
}
|
496 |
|
|
}
|
497 |
|
|
return port;
|
498 |
|
|
}
|
499 |
|
|
|
500 |
|
|
/**
|
501 |
|
|
* Connects to another host. The function given as the "connected"
|
502 |
|
|
* argument will be called when the connection has been established.
|
503 |
|
|
*
|
504 |
|
|
*/
|
505 |
|
|
err_t
|
506 |
|
|
tcp_connect(struct tcp_pcb *pcb, struct ip_addr *ipaddr, u16_t port,
|
507 |
|
|
err_t (* connected)(void *arg, struct tcp_pcb *tpcb, err_t err))
|
508 |
|
|
{
|
509 |
|
|
u32_t optdata;
|
510 |
|
|
err_t ret;
|
511 |
|
|
u32_t iss;
|
512 |
|
|
|
513 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %u\n", port));
|
514 |
|
|
if (ipaddr != NULL) {
|
515 |
|
|
pcb->remote_ip = *ipaddr;
|
516 |
|
|
} else {
|
517 |
|
|
return ERR_VAL;
|
518 |
|
|
}
|
519 |
|
|
pcb->remote_port = port;
|
520 |
|
|
if (pcb->local_port == 0) {
|
521 |
|
|
pcb->local_port = tcp_new_port();
|
522 |
|
|
}
|
523 |
|
|
iss = tcp_next_iss();
|
524 |
|
|
pcb->rcv_nxt = 0;
|
525 |
|
|
pcb->snd_nxt = iss;
|
526 |
|
|
pcb->lastack = iss - 1;
|
527 |
|
|
pcb->snd_lbb = iss - 1;
|
528 |
|
|
pcb->rcv_wnd = TCP_WND;
|
529 |
|
|
pcb->snd_wnd = TCP_WND;
|
530 |
|
|
pcb->mss = TCP_MSS;
|
531 |
|
|
pcb->cwnd = 1;
|
532 |
|
|
pcb->ssthresh = pcb->mss * 10;
|
533 |
|
|
pcb->state = SYN_SENT;
|
534 |
|
|
#if LWIP_CALLBACK_API
|
535 |
|
|
pcb->connected = connected;
|
536 |
|
|
#endif /* LWIP_CALLBACK_API */
|
537 |
|
|
TCP_REG(&tcp_active_pcbs, pcb);
|
538 |
|
|
|
539 |
|
|
/* Build an MSS option */
|
540 |
|
|
optdata = htonl(((u32_t)2 << 24) |
|
541 |
|
|
((u32_t)4 << 16) |
|
542 |
|
|
(((u32_t)pcb->mss / 256) << 8) |
|
543 |
|
|
(pcb->mss & 255));
|
544 |
|
|
|
545 |
|
|
ret = tcp_enqueue(pcb, NULL, 0, TCP_SYN, 0, (u8_t *)&optdata, 4);
|
546 |
|
|
if (ret == ERR_OK) {
|
547 |
|
|
tcp_output(pcb);
|
548 |
|
|
}
|
549 |
|
|
return ret;
|
550 |
|
|
}
|
551 |
|
|
|
552 |
|
|
/**
|
553 |
|
|
* Called every 500 ms and implements the retransmission timer and the timer that
|
554 |
|
|
* removes PCBs that have been in TIME-WAIT for enough time. It also increments
|
555 |
|
|
* various timers such as the inactivity timer in each PCB.
|
556 |
|
|
*/
|
557 |
|
|
void
|
558 |
|
|
tcp_slowtmr(void)
|
559 |
|
|
{
|
560 |
|
|
struct tcp_pcb *pcb, *pcb2, *prev;
|
561 |
|
|
u32_t eff_wnd;
|
562 |
|
|
u8_t pcb_remove; /* flag if a PCB should be removed */
|
563 |
|
|
err_t err;
|
564 |
|
|
|
565 |
|
|
err = ERR_OK;
|
566 |
|
|
|
567 |
|
|
++tcp_ticks;
|
568 |
|
|
|
569 |
|
|
/* Steps through all of the active PCBs. */
|
570 |
|
|
prev = NULL;
|
571 |
|
|
pcb = tcp_active_pcbs;
|
572 |
|
|
if (pcb == NULL) {
|
573 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
|
574 |
|
|
}
|
575 |
|
|
while (pcb != NULL) {
|
576 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
|
577 |
|
|
LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
|
578 |
|
|
LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
|
579 |
|
|
LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
|
580 |
|
|
|
581 |
|
|
pcb_remove = 0;
|
582 |
|
|
|
583 |
|
|
if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
|
584 |
|
|
++pcb_remove;
|
585 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
|
586 |
|
|
}
|
587 |
|
|
else if (pcb->nrtx == TCP_MAXRTX) {
|
588 |
|
|
++pcb_remove;
|
589 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
|
590 |
|
|
} else {
|
591 |
|
|
++pcb->rtime;
|
592 |
|
|
if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
|
593 |
|
|
|
594 |
|
|
/* Time for a retransmission. */
|
595 |
|
|
LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %u pcb->rto %u\n",
|
596 |
|
|
pcb->rtime, pcb->rto));
|
597 |
|
|
|
598 |
|
|
/* Double retransmission time-out unless we are trying to
|
599 |
|
|
* connect to somebody (i.e., we are in SYN_SENT). */
|
600 |
|
|
if (pcb->state != SYN_SENT) {
|
601 |
|
|
pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
|
602 |
|
|
}
|
603 |
|
|
/* Reduce congestion window and ssthresh. */
|
604 |
|
|
eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
|
605 |
|
|
pcb->ssthresh = eff_wnd >> 1;
|
606 |
|
|
if (pcb->ssthresh < pcb->mss) {
|
607 |
|
|
pcb->ssthresh = pcb->mss * 2;
|
608 |
|
|
}
|
609 |
|
|
pcb->cwnd = pcb->mss;
|
610 |
|
|
LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %u ssthresh %u\n",
|
611 |
|
|
pcb->cwnd, pcb->ssthresh));
|
612 |
|
|
|
613 |
|
|
/* The following needs to be called AFTER cwnd is set to one mss - STJ */
|
614 |
|
|
tcp_rexmit_rto(pcb);
|
615 |
|
|
}
|
616 |
|
|
}
|
617 |
|
|
/* Check if this PCB has stayed too long in FIN-WAIT-2 */
|
618 |
|
|
if (pcb->state == FIN_WAIT_2) {
|
619 |
|
|
if ((u32_t)(tcp_ticks - pcb->tmr) >
|
620 |
|
|
TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
|
621 |
|
|
++pcb_remove;
|
622 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
|
623 |
|
|
}
|
624 |
|
|
}
|
625 |
|
|
|
626 |
|
|
/* Check if KEEPALIVE should be sent */
|
627 |
|
|
if((pcb->so_options & SOF_KEEPALIVE) && ((pcb->state == ESTABLISHED) || (pcb->state == CLOSE_WAIT))) {
|
628 |
|
|
if((u32_t)(tcp_ticks - pcb->tmr) > (pcb->keepalive + TCP_MAXIDLE) / TCP_SLOW_INTERVAL) {
|
629 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %u.%u.%u.%u.\n",
|
630 |
|
|
ip4_addr1(&pcb->remote_ip), ip4_addr2(&pcb->remote_ip),
|
631 |
|
|
ip4_addr3(&pcb->remote_ip), ip4_addr4(&pcb->remote_ip)));
|
632 |
|
|
|
633 |
|
|
tcp_abort(pcb);
|
634 |
|
|
}
|
635 |
|
|
else if((u32_t)(tcp_ticks - pcb->tmr) > (pcb->keepalive + pcb->keep_cnt * TCP_KEEPINTVL) / TCP_SLOW_INTERVAL) {
|
636 |
|
|
tcp_keepalive(pcb);
|
637 |
|
|
pcb->keep_cnt++;
|
638 |
|
|
}
|
639 |
|
|
}
|
640 |
|
|
|
641 |
|
|
/* If this PCB has queued out of sequence data, but has been
|
642 |
|
|
inactive for too long, will drop the data (it will eventually
|
643 |
|
|
be retransmitted). */
|
644 |
|
|
#if TCP_QUEUE_OOSEQ
|
645 |
|
|
if (pcb->ooseq != NULL &&
|
646 |
|
|
(u32_t)tcp_ticks - pcb->tmr >=
|
647 |
|
|
pcb->rto * (u32_t)TCP_OOSEQ_TIMEOUT) {
|
648 |
|
|
tcp_segs_free(pcb->ooseq);
|
649 |
|
|
pcb->ooseq = NULL;
|
650 |
|
|
LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
|
651 |
|
|
}
|
652 |
|
|
#endif /* TCP_QUEUE_OOSEQ */
|
653 |
|
|
|
654 |
|
|
/* Check if this PCB has stayed too long in SYN-RCVD */
|
655 |
|
|
if (pcb->state == SYN_RCVD) {
|
656 |
|
|
if ((u32_t)(tcp_ticks - pcb->tmr) >
|
657 |
|
|
TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
|
658 |
|
|
++pcb_remove;
|
659 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
|
660 |
|
|
}
|
661 |
|
|
}
|
662 |
|
|
|
663 |
|
|
|
664 |
|
|
/* If the PCB should be removed, do it. */
|
665 |
|
|
if (pcb_remove) {
|
666 |
|
|
tcp_pcb_purge(pcb);
|
667 |
|
|
/* Remove PCB from tcp_active_pcbs list. */
|
668 |
|
|
if (prev != NULL) {
|
669 |
|
|
LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
|
670 |
|
|
prev->next = pcb->next;
|
671 |
|
|
} else {
|
672 |
|
|
/* This PCB was the first. */
|
673 |
|
|
LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
|
674 |
|
|
tcp_active_pcbs = pcb->next;
|
675 |
|
|
}
|
676 |
|
|
|
677 |
|
|
TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_ABRT);
|
678 |
|
|
|
679 |
|
|
pcb2 = pcb->next;
|
680 |
|
|
memp_free(MEMP_TCP_PCB, pcb);
|
681 |
|
|
pcb = pcb2;
|
682 |
|
|
} else {
|
683 |
|
|
|
684 |
|
|
/* We check if we should poll the connection. */
|
685 |
|
|
++pcb->polltmr;
|
686 |
|
|
if (pcb->polltmr >= pcb->pollinterval) {
|
687 |
|
|
pcb->polltmr = 0;
|
688 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
|
689 |
|
|
TCP_EVENT_POLL(pcb, err);
|
690 |
|
|
if (err == ERR_OK) {
|
691 |
|
|
tcp_output(pcb);
|
692 |
|
|
}
|
693 |
|
|
}
|
694 |
|
|
|
695 |
|
|
prev = pcb;
|
696 |
|
|
pcb = pcb->next;
|
697 |
|
|
}
|
698 |
|
|
}
|
699 |
|
|
|
700 |
|
|
|
701 |
|
|
/* Steps through all of the TIME-WAIT PCBs. */
|
702 |
|
|
prev = NULL;
|
703 |
|
|
pcb = tcp_tw_pcbs;
|
704 |
|
|
while (pcb != NULL) {
|
705 |
|
|
LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
|
706 |
|
|
pcb_remove = 0;
|
707 |
|
|
|
708 |
|
|
/* Check if this PCB has stayed long enough in TIME-WAIT */
|
709 |
|
|
if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
|
710 |
|
|
++pcb_remove;
|
711 |
|
|
}
|
712 |
|
|
|
713 |
|
|
|
714 |
|
|
|
715 |
|
|
/* If the PCB should be removed, do it. */
|
716 |
|
|
if (pcb_remove) {
|
717 |
|
|
tcp_pcb_purge(pcb);
|
718 |
|
|
/* Remove PCB from tcp_tw_pcbs list. */
|
719 |
|
|
if (prev != NULL) {
|
720 |
|
|
LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
|
721 |
|
|
prev->next = pcb->next;
|
722 |
|
|
} else {
|
723 |
|
|
/* This PCB was the first. */
|
724 |
|
|
LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
|
725 |
|
|
tcp_tw_pcbs = pcb->next;
|
726 |
|
|
}
|
727 |
|
|
pcb2 = pcb->next;
|
728 |
|
|
memp_free(MEMP_TCP_PCB, pcb);
|
729 |
|
|
pcb = pcb2;
|
730 |
|
|
} else {
|
731 |
|
|
prev = pcb;
|
732 |
|
|
pcb = pcb->next;
|
733 |
|
|
}
|
734 |
|
|
}
|
735 |
|
|
}
|
736 |
|
|
|
737 |
|
|
/**
|
738 |
|
|
* Is called every TCP_FAST_INTERVAL (250 ms) and sends delayed ACKs.
|
739 |
|
|
*/
|
740 |
|
|
void
|
741 |
|
|
tcp_fasttmr(void)
|
742 |
|
|
{
|
743 |
|
|
struct tcp_pcb *pcb;
|
744 |
|
|
|
745 |
|
|
/* send delayed ACKs */
|
746 |
|
|
for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
|
747 |
|
|
if (pcb->flags & TF_ACK_DELAY) {
|
748 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
|
749 |
|
|
tcp_ack_now(pcb);
|
750 |
|
|
pcb->flags &= ~(TF_ACK_DELAY | TF_ACK_NOW);
|
751 |
|
|
}
|
752 |
|
|
}
|
753 |
|
|
}
|
754 |
|
|
|
755 |
|
|
/**
|
756 |
|
|
* Deallocates a list of TCP segments (tcp_seg structures).
|
757 |
|
|
*
|
758 |
|
|
*/
|
759 |
|
|
u8_t
|
760 |
|
|
tcp_segs_free(struct tcp_seg *seg)
|
761 |
|
|
{
|
762 |
|
|
u8_t count = 0;
|
763 |
|
|
struct tcp_seg *next;
|
764 |
|
|
while (seg != NULL) {
|
765 |
|
|
next = seg->next;
|
766 |
|
|
count += tcp_seg_free(seg);
|
767 |
|
|
seg = next;
|
768 |
|
|
}
|
769 |
|
|
return count;
|
770 |
|
|
}
|
771 |
|
|
|
772 |
|
|
/**
|
773 |
|
|
* Frees a TCP segment.
|
774 |
|
|
*
|
775 |
|
|
*/
|
776 |
|
|
u8_t
|
777 |
|
|
tcp_seg_free(struct tcp_seg *seg)
|
778 |
|
|
{
|
779 |
|
|
u8_t count = 0;
|
780 |
|
|
|
781 |
|
|
if (seg != NULL) {
|
782 |
|
|
if (seg->p != NULL) {
|
783 |
|
|
count = pbuf_free(seg->p);
|
784 |
|
|
#if TCP_DEBUG
|
785 |
|
|
seg->p = NULL;
|
786 |
|
|
#endif /* TCP_DEBUG */
|
787 |
|
|
}
|
788 |
|
|
memp_free(MEMP_TCP_SEG, seg);
|
789 |
|
|
}
|
790 |
|
|
return count;
|
791 |
|
|
}
|
792 |
|
|
|
793 |
|
|
/**
|
794 |
|
|
* Sets the priority of a connection.
|
795 |
|
|
*
|
796 |
|
|
*/
|
797 |
|
|
void
|
798 |
|
|
tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
|
799 |
|
|
{
|
800 |
|
|
pcb->prio = prio;
|
801 |
|
|
}
|
802 |
|
|
#if TCP_QUEUE_OOSEQ
|
803 |
|
|
|
804 |
|
|
/**
|
805 |
|
|
* Returns a copy of the given TCP segment.
|
806 |
|
|
*
|
807 |
|
|
*/
|
808 |
|
|
struct tcp_seg *
|
809 |
|
|
tcp_seg_copy(struct tcp_seg *seg)
|
810 |
|
|
{
|
811 |
|
|
struct tcp_seg *cseg;
|
812 |
|
|
|
813 |
|
|
cseg = memp_malloc(MEMP_TCP_SEG);
|
814 |
|
|
if (cseg == NULL) {
|
815 |
|
|
return NULL;
|
816 |
|
|
}
|
817 |
|
|
memcpy((char *)cseg, (const char *)seg, sizeof(struct tcp_seg));
|
818 |
|
|
pbuf_ref(cseg->p);
|
819 |
|
|
return cseg;
|
820 |
|
|
}
|
821 |
|
|
#endif
|
822 |
|
|
|
823 |
|
|
#if LWIP_CALLBACK_API
|
824 |
|
|
static err_t
|
825 |
|
|
tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
|
826 |
|
|
{
|
827 |
|
|
arg = arg;
|
828 |
|
|
if (p != NULL) {
|
829 |
|
|
pbuf_free(p);
|
830 |
|
|
} else if (err == ERR_OK) {
|
831 |
|
|
return tcp_close(pcb);
|
832 |
|
|
}
|
833 |
|
|
return ERR_OK;
|
834 |
|
|
}
|
835 |
|
|
#endif /* LWIP_CALLBACK_API */
|
836 |
|
|
|
837 |
|
|
static void
|
838 |
|
|
tcp_kill_prio(u8_t prio)
|
839 |
|
|
{
|
840 |
|
|
struct tcp_pcb *pcb, *inactive;
|
841 |
|
|
u32_t inactivity;
|
842 |
|
|
u8_t mprio;
|
843 |
|
|
|
844 |
|
|
|
845 |
|
|
mprio = TCP_PRIO_MAX;
|
846 |
|
|
|
847 |
|
|
/* We kill the oldest active connection that has lower priority than
|
848 |
|
|
prio. */
|
849 |
|
|
inactivity = 0;
|
850 |
|
|
inactive = NULL;
|
851 |
|
|
for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
|
852 |
|
|
if (pcb->prio <= prio &&
|
853 |
|
|
pcb->prio <= mprio &&
|
854 |
|
|
(u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
|
855 |
|
|
inactivity = tcp_ticks - pcb->tmr;
|
856 |
|
|
inactive = pcb;
|
857 |
|
|
mprio = pcb->prio;
|
858 |
|
|
}
|
859 |
|
|
}
|
860 |
|
|
if (inactive != NULL) {
|
861 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%ld)\n",
|
862 |
|
|
(void *)inactive, inactivity));
|
863 |
|
|
tcp_abort(inactive);
|
864 |
|
|
}
|
865 |
|
|
}
|
866 |
|
|
|
867 |
|
|
|
868 |
|
|
static void
|
869 |
|
|
tcp_kill_timewait(void)
|
870 |
|
|
{
|
871 |
|
|
struct tcp_pcb *pcb, *inactive;
|
872 |
|
|
u32_t inactivity;
|
873 |
|
|
|
874 |
|
|
inactivity = 0;
|
875 |
|
|
inactive = NULL;
|
876 |
|
|
for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
|
877 |
|
|
if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
|
878 |
|
|
inactivity = tcp_ticks - pcb->tmr;
|
879 |
|
|
inactive = pcb;
|
880 |
|
|
}
|
881 |
|
|
}
|
882 |
|
|
if (inactive != NULL) {
|
883 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%ld)\n",
|
884 |
|
|
(void *)inactive, inactivity));
|
885 |
|
|
tcp_abort(inactive);
|
886 |
|
|
}
|
887 |
|
|
}
|
888 |
|
|
|
889 |
|
|
|
890 |
|
|
|
891 |
|
|
struct tcp_pcb *
|
892 |
|
|
tcp_alloc(u8_t prio)
|
893 |
|
|
{
|
894 |
|
|
struct tcp_pcb *pcb;
|
895 |
|
|
u32_t iss;
|
896 |
|
|
|
897 |
|
|
pcb = memp_malloc(MEMP_TCP_PCB);
|
898 |
|
|
if (pcb == NULL) {
|
899 |
|
|
/* Try killing oldest connection in TIME-WAIT. */
|
900 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
|
901 |
|
|
tcp_kill_timewait();
|
902 |
|
|
pcb = memp_malloc(MEMP_TCP_PCB);
|
903 |
|
|
if (pcb == NULL) {
|
904 |
|
|
tcp_kill_prio(prio);
|
905 |
|
|
pcb = memp_malloc(MEMP_TCP_PCB);
|
906 |
|
|
}
|
907 |
|
|
}
|
908 |
|
|
if (pcb != NULL) {
|
909 |
|
|
memset(pcb, 0, sizeof(struct tcp_pcb));
|
910 |
|
|
pcb->prio = TCP_PRIO_NORMAL;
|
911 |
|
|
pcb->snd_buf = TCP_SND_BUF;
|
912 |
|
|
pcb->snd_queuelen = 0;
|
913 |
|
|
pcb->rcv_wnd = TCP_WND;
|
914 |
|
|
pcb->tos = 0;
|
915 |
|
|
pcb->ttl = TCP_TTL;
|
916 |
|
|
pcb->mss = TCP_MSS;
|
917 |
|
|
pcb->rto = 3000 / TCP_SLOW_INTERVAL;
|
918 |
|
|
pcb->sa = 0;
|
919 |
|
|
pcb->sv = 3000 / TCP_SLOW_INTERVAL;
|
920 |
|
|
pcb->rtime = 0;
|
921 |
|
|
pcb->cwnd = 1;
|
922 |
|
|
iss = tcp_next_iss();
|
923 |
|
|
pcb->snd_wl2 = iss;
|
924 |
|
|
pcb->snd_nxt = iss;
|
925 |
|
|
pcb->snd_max = iss;
|
926 |
|
|
pcb->lastack = iss;
|
927 |
|
|
pcb->snd_lbb = iss;
|
928 |
|
|
pcb->tmr = tcp_ticks;
|
929 |
|
|
|
930 |
|
|
pcb->polltmr = 0;
|
931 |
|
|
|
932 |
|
|
#if LWIP_CALLBACK_API
|
933 |
|
|
pcb->recv = tcp_recv_null;
|
934 |
|
|
#endif /* LWIP_CALLBACK_API */
|
935 |
|
|
|
936 |
|
|
/* Init KEEPALIVE timer */
|
937 |
|
|
pcb->keepalive = TCP_KEEPDEFAULT;
|
938 |
|
|
pcb->keep_cnt = 0;
|
939 |
|
|
}
|
940 |
|
|
return pcb;
|
941 |
|
|
}
|
942 |
|
|
|
943 |
|
|
/**
|
944 |
|
|
* Creates a new TCP protocol control block but doesn't place it on
|
945 |
|
|
* any of the TCP PCB lists.
|
946 |
|
|
*
|
947 |
|
|
* @internal: Maybe there should be a idle TCP PCB list where these
|
948 |
|
|
* PCBs are put on. We can then implement port reservation using
|
949 |
|
|
* tcp_bind(). Currently, we lack this (BSD socket type of) feature.
|
950 |
|
|
*/
|
951 |
|
|
|
952 |
|
|
struct tcp_pcb *
|
953 |
|
|
tcp_new(void)
|
954 |
|
|
{
|
955 |
|
|
return tcp_alloc(TCP_PRIO_NORMAL);
|
956 |
|
|
}
|
957 |
|
|
|
958 |
|
|
/*
|
959 |
|
|
* tcp_arg():
|
960 |
|
|
*
|
961 |
|
|
* Used to specify the argument that should be passed callback
|
962 |
|
|
* functions.
|
963 |
|
|
*
|
964 |
|
|
*/
|
965 |
|
|
|
966 |
|
|
void
|
967 |
|
|
tcp_arg(struct tcp_pcb *pcb, void *arg)
|
968 |
|
|
{
|
969 |
|
|
pcb->callback_arg = arg;
|
970 |
|
|
}
|
971 |
|
|
#if LWIP_CALLBACK_API
|
972 |
|
|
|
973 |
|
|
/**
|
974 |
|
|
* Used to specify the function that should be called when a TCP
|
975 |
|
|
* connection receives data.
|
976 |
|
|
*
|
977 |
|
|
*/
|
978 |
|
|
void
|
979 |
|
|
tcp_recv(struct tcp_pcb *pcb,
|
980 |
|
|
err_t (* recv)(void *arg, struct tcp_pcb *tpcb, struct pbuf *p, err_t err))
|
981 |
|
|
{
|
982 |
|
|
pcb->recv = recv;
|
983 |
|
|
}
|
984 |
|
|
|
985 |
|
|
/**
|
986 |
|
|
* Used to specify the function that should be called when TCP data
|
987 |
|
|
* has been successfully delivered to the remote host.
|
988 |
|
|
*
|
989 |
|
|
*/
|
990 |
|
|
|
991 |
|
|
void
|
992 |
|
|
tcp_sent(struct tcp_pcb *pcb,
|
993 |
|
|
err_t (* sent)(void *arg, struct tcp_pcb *tpcb, u16_t len))
|
994 |
|
|
{
|
995 |
|
|
pcb->sent = sent;
|
996 |
|
|
}
|
997 |
|
|
|
998 |
|
|
/**
|
999 |
|
|
* Used to specify the function that should be called when a fatal error
|
1000 |
|
|
* has occured on the connection.
|
1001 |
|
|
*
|
1002 |
|
|
*/
|
1003 |
|
|
void
|
1004 |
|
|
tcp_err(struct tcp_pcb *pcb,
|
1005 |
|
|
void (* errf)(void *arg, err_t err))
|
1006 |
|
|
{
|
1007 |
|
|
pcb->errf = errf;
|
1008 |
|
|
}
|
1009 |
|
|
|
1010 |
|
|
/**
|
1011 |
|
|
* Used for specifying the function that should be called when a
|
1012 |
|
|
* LISTENing connection has been connected to another host.
|
1013 |
|
|
*
|
1014 |
|
|
*/
|
1015 |
|
|
void
|
1016 |
|
|
tcp_accept(struct tcp_pcb *pcb,
|
1017 |
|
|
err_t (* accept)(void *arg, struct tcp_pcb *newpcb, err_t err))
|
1018 |
|
|
{
|
1019 |
|
|
((struct tcp_pcb_listen *)pcb)->accept = accept;
|
1020 |
|
|
}
|
1021 |
|
|
#endif /* LWIP_CALLBACK_API */
|
1022 |
|
|
|
1023 |
|
|
|
1024 |
|
|
/**
|
1025 |
|
|
* Used to specify the function that should be called periodically
|
1026 |
|
|
* from TCP. The interval is specified in terms of the TCP coarse
|
1027 |
|
|
* timer interval, which is called twice a second.
|
1028 |
|
|
*
|
1029 |
|
|
*/
|
1030 |
|
|
void
|
1031 |
|
|
tcp_poll(struct tcp_pcb *pcb,
|
1032 |
|
|
err_t (* poll)(void *arg, struct tcp_pcb *tpcb), u8_t interval)
|
1033 |
|
|
{
|
1034 |
|
|
#if LWIP_CALLBACK_API
|
1035 |
|
|
pcb->poll = poll;
|
1036 |
|
|
#endif /* LWIP_CALLBACK_API */
|
1037 |
|
|
pcb->pollinterval = interval;
|
1038 |
|
|
}
|
1039 |
|
|
|
1040 |
|
|
/**
|
1041 |
|
|
* Purges a TCP PCB. Removes any buffered data and frees the buffer memory.
|
1042 |
|
|
*
|
1043 |
|
|
*/
|
1044 |
|
|
void
|
1045 |
|
|
tcp_pcb_purge(struct tcp_pcb *pcb)
|
1046 |
|
|
{
|
1047 |
|
|
if (pcb->state != CLOSED &&
|
1048 |
|
|
pcb->state != TIME_WAIT &&
|
1049 |
|
|
pcb->state != LISTEN) {
|
1050 |
|
|
|
1051 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
|
1052 |
|
|
|
1053 |
|
|
if (pcb->unsent != NULL) {
|
1054 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
|
1055 |
|
|
}
|
1056 |
|
|
if (pcb->unacked != NULL) {
|
1057 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
|
1058 |
|
|
}
|
1059 |
|
|
#if TCP_QUEUE_OOSEQ /* LW */
|
1060 |
|
|
if (pcb->ooseq != NULL) {
|
1061 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
|
1062 |
|
|
}
|
1063 |
|
|
|
1064 |
|
|
tcp_segs_free(pcb->ooseq);
|
1065 |
|
|
pcb->ooseq = NULL;
|
1066 |
|
|
#endif /* TCP_QUEUE_OOSEQ */
|
1067 |
|
|
tcp_segs_free(pcb->unsent);
|
1068 |
|
|
tcp_segs_free(pcb->unacked);
|
1069 |
|
|
pcb->unacked = pcb->unsent = NULL;
|
1070 |
|
|
}
|
1071 |
|
|
}
|
1072 |
|
|
|
1073 |
|
|
/**
|
1074 |
|
|
* Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
|
1075 |
|
|
*
|
1076 |
|
|
*/
|
1077 |
|
|
void
|
1078 |
|
|
tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb)
|
1079 |
|
|
{
|
1080 |
|
|
TCP_RMV(pcblist, pcb);
|
1081 |
|
|
|
1082 |
|
|
tcp_pcb_purge(pcb);
|
1083 |
|
|
|
1084 |
|
|
/* if there is an outstanding delayed ACKs, send it */
|
1085 |
|
|
if (pcb->state != TIME_WAIT &&
|
1086 |
|
|
pcb->state != LISTEN &&
|
1087 |
|
|
pcb->flags & TF_ACK_DELAY) {
|
1088 |
|
|
pcb->flags |= TF_ACK_NOW;
|
1089 |
|
|
tcp_output(pcb);
|
1090 |
|
|
}
|
1091 |
|
|
pcb->state = CLOSED;
|
1092 |
|
|
|
1093 |
|
|
LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
|
1094 |
|
|
}
|
1095 |
|
|
|
1096 |
|
|
/**
|
1097 |
|
|
* Calculates a new initial sequence number for new connections.
|
1098 |
|
|
*
|
1099 |
|
|
*/
|
1100 |
|
|
u32_t
|
1101 |
|
|
tcp_next_iss(void)
|
1102 |
|
|
{
|
1103 |
|
|
static u32_t iss = 6510;
|
1104 |
|
|
|
1105 |
|
|
iss += tcp_ticks; /* XXX */
|
1106 |
|
|
return iss;
|
1107 |
|
|
}
|
1108 |
|
|
|
1109 |
|
|
#if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
|
1110 |
|
|
void
|
1111 |
|
|
tcp_debug_print(struct tcp_hdr *tcphdr)
|
1112 |
|
|
{
|
1113 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
|
1114 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
1115 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("| %5u | %5u | (src port, dest port)\n",
|
1116 |
|
|
ntohs(tcphdr->src), ntohs(tcphdr->dest)));
|
1117 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
1118 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("| %010lu | (seq no)\n",
|
1119 |
|
|
ntohl(tcphdr->seqno)));
|
1120 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
1121 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("| %010lu | (ack no)\n",
|
1122 |
|
|
ntohl(tcphdr->ackno)));
|
1123 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
1124 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("| %2u | |%u%u%u%u%u%u| %5u | (hdrlen, flags (",
|
1125 |
|
|
TCPH_HDRLEN(tcphdr),
|
1126 |
|
|
TCPH_FLAGS(tcphdr) >> 5 & 1,
|
1127 |
|
|
TCPH_FLAGS(tcphdr) >> 4 & 1,
|
1128 |
|
|
TCPH_FLAGS(tcphdr) >> 3 & 1,
|
1129 |
|
|
TCPH_FLAGS(tcphdr) >> 2 & 1,
|
1130 |
|
|
TCPH_FLAGS(tcphdr) >> 1 & 1,
|
1131 |
|
|
TCPH_FLAGS(tcphdr) & 1,
|
1132 |
|
|
ntohs(tcphdr->wnd)));
|
1133 |
|
|
tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
|
1134 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
|
1135 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
1136 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("| 0x%04x | %5u | (chksum, urgp)\n",
|
1137 |
|
|
ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
|
1138 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
1139 |
|
|
}
|
1140 |
|
|
|
1141 |
|
|
void
|
1142 |
|
|
tcp_debug_print_state(enum tcp_state s)
|
1143 |
|
|
{
|
1144 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("State: "));
|
1145 |
|
|
switch (s) {
|
1146 |
|
|
case CLOSED:
|
1147 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("CLOSED\n"));
|
1148 |
|
|
break;
|
1149 |
|
|
case LISTEN:
|
1150 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("LISTEN\n"));
|
1151 |
|
|
break;
|
1152 |
|
|
case SYN_SENT:
|
1153 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("SYN_SENT\n"));
|
1154 |
|
|
break;
|
1155 |
|
|
case SYN_RCVD:
|
1156 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("SYN_RCVD\n"));
|
1157 |
|
|
break;
|
1158 |
|
|
case ESTABLISHED:
|
1159 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("ESTABLISHED\n"));
|
1160 |
|
|
break;
|
1161 |
|
|
case FIN_WAIT_1:
|
1162 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("FIN_WAIT_1\n"));
|
1163 |
|
|
break;
|
1164 |
|
|
case FIN_WAIT_2:
|
1165 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("FIN_WAIT_2\n"));
|
1166 |
|
|
break;
|
1167 |
|
|
case CLOSE_WAIT:
|
1168 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("CLOSE_WAIT\n"));
|
1169 |
|
|
break;
|
1170 |
|
|
case CLOSING:
|
1171 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("CLOSING\n"));
|
1172 |
|
|
break;
|
1173 |
|
|
case LAST_ACK:
|
1174 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("LAST_ACK\n"));
|
1175 |
|
|
break;
|
1176 |
|
|
case TIME_WAIT:
|
1177 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("TIME_WAIT\n"));
|
1178 |
|
|
break;
|
1179 |
|
|
}
|
1180 |
|
|
}
|
1181 |
|
|
|
1182 |
|
|
void
|
1183 |
|
|
tcp_debug_print_flags(u8_t flags)
|
1184 |
|
|
{
|
1185 |
|
|
if (flags & TCP_FIN) {
|
1186 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
|
1187 |
|
|
}
|
1188 |
|
|
if (flags & TCP_SYN) {
|
1189 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
|
1190 |
|
|
}
|
1191 |
|
|
if (flags & TCP_RST) {
|
1192 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("RST "));
|
1193 |
|
|
}
|
1194 |
|
|
if (flags & TCP_PSH) {
|
1195 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
|
1196 |
|
|
}
|
1197 |
|
|
if (flags & TCP_ACK) {
|
1198 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
|
1199 |
|
|
}
|
1200 |
|
|
if (flags & TCP_URG) {
|
1201 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("URG "));
|
1202 |
|
|
}
|
1203 |
|
|
if (flags & TCP_ECE) {
|
1204 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
|
1205 |
|
|
}
|
1206 |
|
|
if (flags & TCP_CWR) {
|
1207 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
|
1208 |
|
|
}
|
1209 |
|
|
}
|
1210 |
|
|
|
1211 |
|
|
void
|
1212 |
|
|
tcp_debug_print_pcbs(void)
|
1213 |
|
|
{
|
1214 |
|
|
struct tcp_pcb *pcb;
|
1215 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
|
1216 |
|
|
for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
|
1217 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("Local port %u, foreign port %u snd_nxt %lu rcv_nxt %lu ",
|
1218 |
|
|
pcb->local_port, pcb->remote_port,
|
1219 |
|
|
pcb->snd_nxt, pcb->rcv_nxt));
|
1220 |
|
|
tcp_debug_print_state(pcb->state);
|
1221 |
|
|
}
|
1222 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
|
1223 |
|
|
for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
|
1224 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("Local port %u, foreign port %u snd_nxt %lu rcv_nxt %lu ",
|
1225 |
|
|
pcb->local_port, pcb->remote_port,
|
1226 |
|
|
pcb->snd_nxt, pcb->rcv_nxt));
|
1227 |
|
|
tcp_debug_print_state(pcb->state);
|
1228 |
|
|
}
|
1229 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
|
1230 |
|
|
for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
|
1231 |
|
|
LWIP_DEBUGF(TCP_DEBUG, ("Local port %u, foreign port %u snd_nxt %lu rcv_nxt %lu ",
|
1232 |
|
|
pcb->local_port, pcb->remote_port,
|
1233 |
|
|
pcb->snd_nxt, pcb->rcv_nxt));
|
1234 |
|
|
tcp_debug_print_state(pcb->state);
|
1235 |
|
|
}
|
1236 |
|
|
}
|
1237 |
|
|
|
1238 |
|
|
int
|
1239 |
|
|
tcp_pcbs_sane(void)
|
1240 |
|
|
{
|
1241 |
|
|
struct tcp_pcb *pcb;
|
1242 |
|
|
for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
|
1243 |
|
|
LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
|
1244 |
|
|
LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
|
1245 |
|
|
LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
|
1246 |
|
|
}
|
1247 |
|
|
for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
|
1248 |
|
|
LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
|
1249 |
|
|
}
|
1250 |
|
|
return 1;
|
1251 |
|
|
}
|
1252 |
|
|
#endif /* TCP_DEBUG */
|
1253 |
|
|
#endif /* LWIP_TCP */
|
1254 |
|
|
|
1255 |
|
|
|
1256 |
|
|
|
1257 |
|
|
|
1258 |
|
|
|
1259 |
|
|
|
1260 |
|
|
|
1261 |
|
|
|
1262 |
|
|
|
1263 |
|
|
|