aboutsummaryrefslogtreecommitdiff
path: root/nuttx/net/uip/uip_tcpappsend.c
diff options
context:
space:
mode:
Diffstat (limited to 'nuttx/net/uip/uip_tcpappsend.c')
-rw-r--r--nuttx/net/uip/uip_tcpappsend.c215
1 files changed, 215 insertions, 0 deletions
diff --git a/nuttx/net/uip/uip_tcpappsend.c b/nuttx/net/uip/uip_tcpappsend.c
new file mode 100644
index 000000000..d8a187503
--- /dev/null
+++ b/nuttx/net/uip/uip_tcpappsend.c
@@ -0,0 +1,215 @@
+/****************************************************************************
+ * net/uip/uip_tcpappsend.c
+ *
+ * Copyright (C) 2007-2010 Gregory Nutt. All rights reserved.
+ * Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * 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/uip/uipopt.h>
+#include <nuttx/net/uip/uip.h>
+#include <nuttx/net/uip/uip-arch.h>
+
+#include "uip_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: uip_tcpappsend
+ *
+ * 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.
+ *
+ * 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
+ *
+ * Return:
+ * None
+ *
+ * Assumptions:
+ * Called from the interrupt level or with interrupts disabled.
+ *
+ ****************************************************************************/
+
+void uip_tcpappsend(struct uip_driver_s *dev, struct uip_conn *conn,
+ uint16_t result)
+{
+ /* Handle the result based on the application response */
+
+ nllvdbg("result: %04x d_sndlen: %d conn->unacked: %d\n",
+ result, dev->d_sndlen, conn->unacked);
+
+ /* Check for connection aborted */
+
+ if ((result & UIP_ABORT) != 0)
+ {
+ dev->d_sndlen = 0;
+ conn->tcpstateflags = UIP_CLOSED;
+ nllvdbg("TCP state: UIP_CLOSED\n");
+
+ uip_tcpsend(dev, conn, TCP_RST | TCP_ACK, UIP_IPTCPH_LEN);
+ }
+
+ /* Check for connection closed */
+
+ else if ((result & UIP_CLOSE) != 0)
+ {
+ conn->tcpstateflags = UIP_FIN_WAIT_1;
+ conn->unacked = 1;
+ conn->nrtx = 0;
+ nllvdbg("TCP state: UIP_FIN_WAIT_1\n");
+
+ dev->d_sndlen = 0;
+ uip_tcpsend(dev, conn, TCP_FIN | TCP_ACK, UIP_IPTCPH_LEN);
+ }
+
+ /* None of the above */
+
+ 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-tranmission. 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);
+ }
+
+ /* Then handle the rest of the operation just as for the rexmit case */
+
+ conn->nrtx = 0;
+ uip_tcprexmit(dev, conn, result);
+ }
+}
+
+/****************************************************************************
+ * Name: uip_tcprexmit
+ *
+ * Description:
+ * Handle application retransmission
+ *
+ * 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
+ *
+ * Return:
+ * None
+ *
+ * Assumptions:
+ * Called from the interrupt level or with interrupts disabled.
+ *
+ ****************************************************************************/
+
+void uip_tcprexmit(struct uip_driver_s *dev, struct uip_conn *conn,
+ uint16_t result)
+{
+ nllvdbg("result: %04x d_sndlen: %d conn->unacked: %d\n",
+ result, dev->d_sndlen, conn->unacked);
+
+ dev->d_appdata = dev->d_snddata;
+
+ /* If the application has data to be sent, or if the incoming packet had
+ * new data in it, we must send out a packet.
+ */
+
+ if (dev->d_sndlen > 0 && conn->unacked > 0)
+ {
+ /* We always set the ACK flag in response packets adding the length of
+ * the IP and TCP headers.
+ */
+
+ uip_tcpsend(dev, conn, TCP_ACK | TCP_PSH, dev->d_sndlen + UIP_TCPIP_HLEN);
+ }
+
+ /* If there is no data to send, just send out a pure ACK if one is requested`. */
+
+ else if ((result & UIP_SNDACK) != 0)
+ {
+ uip_tcpsend(dev, conn, TCP_ACK, UIP_TCPIP_HLEN);
+ }
+
+ /* There is nothing to do -- drop the packet */
+
+ else
+ {
+ dev->d_len = 0;
+ }
+}
+#endif /* CONFIG_NET && CONFIG_NET_TCP */
generated by cgit v1.2.3 (git 2.39.1) at 2024-08-31 07:31:27 +0000