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-rw-r--r--nuttx/net/uip/uip_tcptimer.c250
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diff --git a/nuttx/net/uip/uip_tcptimer.c b/nuttx/net/uip/uip_tcptimer.c
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-/****************************************************************************
- * net/uip/uip_tcptimer.c
- * Poll for the availability of TCP TX data
- *
- * Copyright (C) 2007-2010 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * Adapted for NuttX from logic in uIP which also has a BSD-like license:
- *
- * Original author Adam Dunkels <adam@dunkels.com>
- * Copyright () 2001-2003, Adam Dunkels.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
- * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
- * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
-
-/****************************************************************************
- * Included Files
- ****************************************************************************/
-
-#include <nuttx/config.h>
-#if defined(CONFIG_NET) && defined(CONFIG_NET_TCP)
-
-#include <stdint.h>
-#include <debug.h>
-
-#include <nuttx/net/uip/uipopt.h>
-#include <nuttx/net/uip/uip.h>
-#include <nuttx/net/uip/uip-arch.h>
-
-#include "uip_internal.h"
-
-/****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
-
-/****************************************************************************
- * Public Variables
- ****************************************************************************/
-
-/****************************************************************************
- * Private Variables
- ****************************************************************************/
-
-/****************************************************************************
- * Private Functions
- ****************************************************************************/
-
-/****************************************************************************
- * Public Functions
- ****************************************************************************/
-
-/****************************************************************************
- * Name: uip_tcptimer
- *
- * Description:
- * Handle a TCP timer expiration for the provided TCP connection
- *
- * Parameters:
- * dev - The device driver structure to use in the send operation
- * conn - The TCP "connection" to poll for TX data
- * hsed - The polling interval in halves of a second
- *
- * Return:
- * None
- *
- * Assumptions:
- * Called from the interrupt level or with interrupts disabled.
- *
- ****************************************************************************/
-
-void uip_tcptimer(struct uip_driver_s *dev, struct uip_conn *conn, int hsec)
-{
- uint8_t result;
-
- dev->d_snddata = &dev->d_buf[UIP_IPTCPH_LEN + UIP_LLH_LEN];
- dev->d_appdata = &dev->d_buf[UIP_IPTCPH_LEN + UIP_LLH_LEN];
-
- /* Increase the TCP sequence number */
-
- uip_tcpnextsequence();
-
- /* Reset the length variables. */
-
- dev->d_len = 0;
- dev->d_sndlen = 0;
-
- /* Check if the connection is in a state in which we simply wait
- * for the connection to time out. If so, we increase the
- * connection's timer and remove the connection if it times
- * out.
- */
-
- if (conn->tcpstateflags == UIP_TIME_WAIT || conn->tcpstateflags == UIP_FIN_WAIT_2)
- {
- /* Increment the connection timer */
-
- (conn->timer) += hsec;
- if (conn->timer >= UIP_TIME_WAIT_TIMEOUT)
- {
- conn->tcpstateflags = UIP_CLOSED;
- nllvdbg("TCP state: UIP_CLOSED\n");
- }
- }
- else if (conn->tcpstateflags != UIP_CLOSED)
- {
- /* If the connection has outstanding data, we increase the connection's
- * timer and see if it has reached the RTO value in which case we
- * retransmit.
- */
-
- if (conn->unacked > 0)
- {
- /* The connection has outstanding data */
-
- if (conn->timer > hsec)
- {
- /* Will not yet decrement to zero */
-
- conn->timer -= hsec;
- }
- else
- {
- /* Will decrement to zero */
-
- conn->timer = 0;
-
- /* Should we close the connection? */
-
- if (conn->nrtx == UIP_MAXRTX ||
- ((conn->tcpstateflags == UIP_SYN_SENT ||
- conn->tcpstateflags == UIP_SYN_RCVD) &&
- conn->nrtx == UIP_MAXSYNRTX))
- {
- conn->tcpstateflags = UIP_CLOSED;
- nllvdbg("TCP state: UIP_CLOSED\n");
-
- /* We call uip_tcpcallback() with UIP_TIMEDOUT to
- * inform the application that the connection has
- * timed out.
- */
-
- result = uip_tcpcallback(dev, conn, UIP_TIMEDOUT);
-
- /* We also send a reset packet to the remote host. */
-
- uip_tcpsend(dev, conn, TCP_RST | TCP_ACK, UIP_IPTCPH_LEN);
- goto done;
- }
-
- /* Exponential backoff. */
-
- conn->timer = UIP_RTO << (conn->nrtx > 4 ? 4: conn->nrtx);
- (conn->nrtx)++;
-
- /* Ok, so we need to retransmit. We do this differently
- * depending on which state we are in. In ESTABLISHED, we
- * call upon the application so that it may prepare the
- * data for the retransmit. In SYN_RCVD, we resend the
- * SYNACK that we sent earlier and in LAST_ACK we have to
- * retransmit our FINACK.
- */
-
-#ifdef CONFIG_NET_STATISTICS
- uip_stat.tcp.rexmit++;
-#endif
- switch(conn->tcpstateflags & UIP_TS_MASK)
- {
- case UIP_SYN_RCVD:
- /* In the SYN_RCVD state, we should retransmit our
- * SYNACK.
- */
-
- uip_tcpack(dev, conn, TCP_ACK | TCP_SYN);
- goto done;
-
- case UIP_SYN_SENT:
- /* In the SYN_SENT state, we retransmit out SYN. */
-
- uip_tcpack(dev, conn, TCP_SYN);
- goto done;
-
- case UIP_ESTABLISHED:
- /* In the ESTABLISHED state, we call upon the application
- * to do the actual retransmit after which we jump into
- * the code for sending out the packet.
- */
-
- result = uip_tcpcallback(dev, conn, UIP_REXMIT);
- uip_tcprexmit(dev, conn, result);
- goto done;
-
- case UIP_FIN_WAIT_1:
- case UIP_CLOSING:
- case UIP_LAST_ACK:
- /* In all these states we should retransmit a FINACK. */
-
- uip_tcpsend(dev, conn, TCP_FIN | TCP_ACK, UIP_IPTCPH_LEN);
- goto done;
- }
- }
- }
-
- /* The connection does not have outstanding data */
-
- else if ((conn->tcpstateflags & UIP_TS_MASK) == UIP_ESTABLISHED)
- {
- /* If there was no need for a retransmission, we poll the
- * application for new data.
- */
-
- result = uip_tcpcallback(dev, conn, UIP_POLL);
- uip_tcpappsend(dev, conn, result);
- goto done;
- }
- }
-
- /* Nothing to be done */
-
- dev->d_len = 0;
-
-done:
- return;
-}
-
-#endif /* CONFIG_NET && CONFIG_NET_TCP */
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