diff options
Diffstat (limited to 'nuttx/net/uip/uip_tcpappsend.c')
-rw-r--r-- | nuttx/net/uip/uip_tcpappsend.c | 215 |
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 */ |