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- /****************************************************************************
- * net/tcp/tcp_appsend.c
- *
- * Copyright (C) 2007-2010, 2014 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 <assert.h>
- #include <debug.h>
- #include <nuttx/net/netconfig.h>
- #include <nuttx/net/netdev.h>
- #include <nuttx/net/tcp.h>
- #include "devif/devif.h"
- #include "tcp/tcp.h"
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: tcp_appsend
- *
- * Description:
- * Handle application or TCP protocol response. If this function is called
- * with dev->d_sndlen > 0, then this is an application attempting to send
- * packet.
- *
- * Input Parameters:
- * dev - The device driver structure to use in the send operation
- * conn - The TCP connection structure holding connection information
- * result - App result event sent
- *
- * Returned Value:
- * None
- *
- * Assumptions:
- * The network is locked.
- *
- ****************************************************************************/
- void tcp_appsend(FAR struct net_driver_s *dev, FAR struct tcp_conn_s *conn,
- uint16_t result)
- {
- uint8_t hdrlen;
- /* Handle the result based on the application response */
- ninfo("result: %04x d_sndlen: %d conn->unacked: %d\n",
- result, dev->d_sndlen, conn->unacked);
- /* Get the IP header length associated with the IP domain configured for
- * this TCP connection.
- */
- #ifdef CONFIG_NET_IPv4
- #ifdef CONFIG_NET_IPv6
- if (conn->domain == PF_INET)
- #endif
- {
- DEBUGASSERT(IFF_IS_IPv4(dev->d_flags));
- hdrlen = IPv4TCP_HDRLEN;
- }
- #endif /* CONFIG_NET_IPv4 */
- #ifdef CONFIG_NET_IPv6
- #ifdef CONFIG_NET_IPv4
- else
- #endif
- {
- DEBUGASSERT(IFF_IS_IPv6(dev->d_flags));
- hdrlen = IPv6TCP_HDRLEN;
- }
- #endif /* CONFIG_NET_IPv6 */
- /* Check If the device went down */
- if ((result & NETDEV_DOWN) != 0)
- {
- /* If so, make sure that the connection is marked closed
- * and do not try to send anything.
- */
- dev->d_sndlen = 0;
- conn->tcpstateflags = TCP_CLOSED;
- ninfo("TCP state: NETDEV_DOWN\n");
- }
- /* Check for connection aborted */
- else if ((result & TCP_ABORT) != 0)
- {
- dev->d_sndlen = 0;
- conn->tcpstateflags = TCP_CLOSED;
- ninfo("TCP state: TCP_CLOSED\n");
- tcp_send(dev, conn, TCP_RST | TCP_ACK, hdrlen);
- }
- /* Check for connection closed */
- else if ((result & TCP_CLOSE) != 0)
- {
- conn->tcpstateflags = TCP_FIN_WAIT_1;
- conn->unacked = 1;
- conn->nrtx = 0;
- #ifdef CONFIG_NET_TCP_WRITE_BUFFERS
- conn->sndseq_max = tcp_getsequence(conn->sndseq) + 1;
- #endif
- ninfo("TCP state: TCP_FIN_WAIT_1\n");
- dev->d_sndlen = 0;
- tcp_send(dev, conn, TCP_FIN | TCP_ACK, hdrlen);
- }
- /* None of the above */
- else
- {
- #ifdef CONFIG_NET_TCP_WRITE_BUFFERS
- DEBUGASSERT(dev->d_sndlen <= conn->mss);
- #else
- /* If d_sndlen > 0, the application has data to be sent. */
- if (dev->d_sndlen > 0)
- {
- /* Remember how much data we send out now so that we know
- * when everything has been acknowledged. Just increment the amount
- * of data sent. This will be needed in sequence number calculations
- * and we know that this is not a re-transmission. Retransmissions
- * do not go through this path.
- */
- conn->unacked += dev->d_sndlen;
- /* The application cannot send more than what is allowed by the
- * MSS (the minumum of the MSS and the available window).
- */
- DEBUGASSERT(dev->d_sndlen <= conn->mss);
- }
- conn->nrtx = 0;
- #endif
- /* Then handle the rest of the operation just as for the rexmit case */
- tcp_rexmit(dev, conn, result);
- }
- }
- /****************************************************************************
- * Name: tcp_rexmit
- *
- * Description:
- * Handle application retransmission
- *
- * Input Parameters:
- * dev - The device driver structure to use in the send operation
- * conn - The TCP connection structure holding connection information
- * result - App result event sent
- *
- * Returned Value:
- * None
- *
- * Assumptions:
- * The network is locked.
- *
- ****************************************************************************/
- void tcp_rexmit(FAR struct net_driver_s *dev, FAR struct tcp_conn_s *conn,
- uint16_t result)
- {
- uint8_t hdrlen;
- ninfo("result: %04x d_sndlen: %d conn->unacked: %d\n",
- result, dev->d_sndlen, conn->unacked);
- /* Get the IP header length associated with the IP domain configured for
- * this TCP connection.
- */
- #ifdef CONFIG_NET_IPv4
- #ifdef CONFIG_NET_IPv6
- if (conn->domain == PF_INET)
- #endif
- {
- DEBUGASSERT(IFF_IS_IPv4(dev->d_flags));
- hdrlen = IPv4TCP_HDRLEN;
- }
- #endif /* CONFIG_NET_IPv4 */
- #ifdef CONFIG_NET_IPv6
- #ifdef CONFIG_NET_IPv4
- else
- #endif
- {
- DEBUGASSERT(IFF_IS_IPv6(dev->d_flags));
- hdrlen = IPv6TCP_HDRLEN;
- }
- #endif /* CONFIG_NET_IPv6 */
- /* If the application has data to be sent, or if the incoming packet had
- * new data in it, we must send out a packet.
- */
- #ifdef CONFIG_NET_TCP_WRITE_BUFFERS
- if (dev->d_sndlen > 0)
- #else
- if (dev->d_sndlen > 0 && conn->unacked > 0)
- #endif
- {
- /* We always set the ACK flag in response packets adding the length of
- * the IP and TCP headers.
- */
- tcp_send(dev, conn, TCP_ACK | TCP_PSH, dev->d_sndlen + hdrlen);
- }
- /* If there is no data to send, just send out a pure ACK if one is requested`. */
- else if ((result & TCP_SNDACK) != 0)
- {
- tcp_send(dev, conn, TCP_ACK, hdrlen);
- }
- /* There is nothing to do -- drop the packet */
- else
- {
- dev->d_len = 0;
- }
- }
- #endif /* CONFIG_NET && CONFIG_NET_TCP */
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