5ea5c4cf09
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@381 42af7a65-404d-4744-a932-0658087f49c3
140 lines
4.9 KiB
C
140 lines
4.9 KiB
C
/****************************************************************************
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* net/uip/uip-tcpcallback.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#ifdef CONFIG_NET
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#include <sys/types.h>
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#include <debug.h>
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#include <net/uip/uipopt.h>
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#include <net/uip/uip.h>
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#include <net/uip/uip-arch.h>
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#include "uip-internal.h"
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Function: uip_tcpcallback
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*
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* Description:
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* Inform the application holding the TCP socket of a change in state.
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*
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* Assumptions:
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* This function is called at the interrupt level with interrupts disabled.
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*
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****************************************************************************/
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uint8 uip_tcpcallback(struct uip_driver_s *dev, struct uip_conn *conn, uint8 flags)
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{
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/* Preserve the UIP_ACKDATA, UIP_CLOSE, and UIP_ABORT in the response.
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* These is needed by uIP to handle responses and buffer state. The
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* UIP_NEWDATA indication will trigger the ACK response, but must be
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* explicitly set in the callback.
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*/
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uint8 ret = flags;
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vdbg("flags: %02x\n", flags);
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/* Check if there is a data callback */
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if (conn->data_event)
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{
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/* Perform the callback. Callback function normally returns the input flags,
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* however, the implemenation may set one of the following:
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*
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* UIP_CLOSE - Gracefully close the current connection
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* UIP_ABORT - Abort (reset) the current connection on an error that
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* prevents UIP_CLOSE from working.
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*
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* Or clear the following:
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*
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* UIP_NEWDATA - May be cleared to suppress returning the ACK response.
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* (dev->d_len should also be set to zero in this case).
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*/
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ret = conn->data_event(dev, conn, flags);
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}
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else if ((flags & UIP_CONN_EVENTS) == 0)
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{
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/* There is no handler to receive new data in place and this is not a
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* connection event (which may also include new data that must be ACKed).
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* In this case, clear the UIP_NEWDATA bit so that no ACK will be sent
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* and drop the packet.
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*/
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dbg("No listener on connection\n");
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#ifdef CONFIG_NET_STATISTICS
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uip_stat.tcp.drop++;
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#endif
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ret &= ~UIP_NEWDATA;
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dev->d_len = 0;
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}
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/* Check if there is a connection-related event and a connection
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* callback.
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*/
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if (((flags & UIP_CONN_EVENTS) != 0) && conn->connection_event)
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{
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/* Perform the callback */
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conn->connection_event(conn, flags);
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}
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return ret;
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}
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#endif /* CONFIG_NET */
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