1 files changed, 238 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..1d6bb7a67
--- /dev/null
+++ b/nuttx/net/uip/uip_tcpappsend.c
@@ -0,0 +1,238 @@
+/****************************************************************************
+ * net/uip/uip_tcpappsend.c
+ *
+ *   Copyright (C) 2007, 2008 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 <sys/types.h>
+#include <debug.h>
+
+#include <net/uip/uipopt.h>
+#include <net/uip/uip.h>
+#include <net/uip/uip-arch.h>
+
+#include "uip_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+#define BUF ((struct uip_tcpip_hdr *)&dev->d_buf[UIP_LLH_LEN])
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: uip_tcpappsend
+ *
+ * Description:
+ *   Handle application response
+ *
+ * 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 result)
+{
+  /* Handle the result based on the application response */
+
+  nvdbg("result: %04x\n", result);
+
+  /* Check for connection aborted */
+
+  if (result & UIP_ABORT)
+    {
+      dev->d_sndlen = 0;
+      conn->tcpstateflags = UIP_CLOSED;
+      nvdbg("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)
+    {
+      conn->tcpstateflags = UIP_FIN_WAIT_1;
+      conn->len = 1;
+      conn->nrtx = 0;
+      nvdbg("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)
+        {
+          /* If the connection has acknowledged data, the contents of
+           * the ->len variable should be discarded.
+           */
+
+          if (result & UIP_ACKDATA)
+            {
+              conn->len = 0;
+            }
+
+          /* If the ->len variable is non-zero the connection has
+           * already data in transit and cannot send anymore right
+           * now.
+           */
+
+          if (conn->len == 0)
+            {
+              /* The application cannot send more than what is
+               * allowed by the mss (the minumum of the MSS and the
+               * available window).
+               */
+
+              if (dev->d_sndlen > conn->mss)
+                {
+                  dev->d_sndlen = conn->mss;
+                }
+
+              /* Remember how much data we send out now so that we
+               * know when everything has been acknowledged.
+               */
+
+              conn->len = dev->d_sndlen;
+            }
+          else
+            {
+              /* If the application already had unacknowledged data,
+               * we make sure that the application does not send
+               * (i.e., retransmit) out more than it previously sent
+               * out.
+               */
+
+              dev->d_sndlen = conn->len;
+            }
+        }
+
+      /* 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 result)
+{
+  nvdbg("result: %04x\n", result);
+
+  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->len > 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, conn->len + 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)
+    {
+      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 */