a932e62067
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@430 42af7a65-404d-4744-a932-0658087f49c3
271 lines
9.0 KiB
C
271 lines
9.0 KiB
C
/****************************************************************************
|
|
* net/uip/uip-tcpcallback.c
|
|
*
|
|
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
|
|
*
|
|
*
|
|
* 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. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "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
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS 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 <string.h>
|
|
#include <debug.h>
|
|
|
|
#include <net/uip/uipopt.h>
|
|
#include <net/uip/uip.h>
|
|
#include <net/uip/uip-arch.h>
|
|
|
|
#include "uip-internal.h"
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Function: uip_readahead
|
|
*
|
|
* Description:
|
|
* Copy as much received data as possible into the readahead buffer
|
|
*
|
|
* Assumptions:
|
|
* This function is called at the interrupt level with interrupts disabled.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#if CONFIG_NET_NTCP_READAHEAD_BUFFERS > 0
|
|
static int uip_readahead(struct uip_readahead_s *readahead, uint8 *buf, int len)
|
|
{
|
|
int available = CONFIG_NET_TCP_READAHEAD_BUFSIZE - readahead->rh_nbytes;
|
|
int recvlen = 0;
|
|
|
|
if (len > 0 && available > 0)
|
|
{
|
|
/* Get the length of the data to buffer. */
|
|
|
|
if (len > available)
|
|
{
|
|
recvlen = available;
|
|
}
|
|
else
|
|
{
|
|
recvlen = len;
|
|
}
|
|
|
|
/* Copy the new appdata into the read-ahead buffer */
|
|
|
|
memcpy(&readahead->rh_buffer[readahead->rh_nbytes], buf, recvlen);
|
|
readahead->rh_nbytes += recvlen;
|
|
}
|
|
return recvlen;
|
|
}
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Function: uip_dataevent
|
|
*
|
|
* Description:
|
|
* This is the default data_event handler that is called when there is no
|
|
* use data handler in place
|
|
*
|
|
* Assumptions:
|
|
* This function is called at the interrupt level with interrupts disabled.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static inline uint8
|
|
uip_dataevent(struct uip_driver_s *dev, struct uip_conn *conn, uint8 flags)
|
|
{
|
|
uint8 ret = flags;
|
|
|
|
/* Is there new data? With non-zero length? (Certain connection events
|
|
* can have zero-length with UIP_NEWDATA set just to cause an ACK).
|
|
*/
|
|
|
|
if ((flags & UIP_NEWDATA) != 0 && dev->d_len > 0)
|
|
{
|
|
#if CONFIG_NET_NTCP_READAHEAD_BUFFERS > 0
|
|
struct uip_readahead_s *readahead1;
|
|
struct uip_readahead_s *readahead2 = NULL;
|
|
uint16 recvlen = 0;
|
|
uint8 *buf = dev->d_appdata;
|
|
int buflen = dev->d_len;
|
|
|
|
/* First, we need to determine if we have space to buffer the data. This
|
|
* needs to be verified before we actually begin buffering the data. We
|
|
* will use any remaining space in the last allocated readahead buffer
|
|
* plus as much one additional buffer. It is expected that the size of
|
|
* readahead buffers are tuned so that one full packet will always fit
|
|
* into one readahead buffer (for example if the buffer size is 420, then
|
|
* a readahead buffer of 366 will hold a full packet of TCP data).
|
|
*/
|
|
|
|
readahead1 = (struct uip_readahead_s*)conn->readahead.tail;
|
|
if ((readahead1 &&
|
|
(CONFIG_NET_TCP_READAHEAD_BUFSIZE - readahead1->rh_nbytes) > buflen) ||
|
|
(readahead2 = uip_tcpreadaheadalloc()) != NULL)
|
|
{
|
|
/* We have buffer space. Now try to append add as much data as possible
|
|
* to the last readahead buffer attached to this connection.
|
|
*/
|
|
|
|
if (readahead1)
|
|
{
|
|
recvlen = uip_readahead(readahead1, buf, buflen);
|
|
if (recvlen > 0)
|
|
{
|
|
buf += recvlen;
|
|
buflen -= recvlen;
|
|
}
|
|
}
|
|
|
|
/* Do we need to buffer into the newly allocated buffer as well? */
|
|
|
|
if (readahead2)
|
|
{
|
|
(void)uip_readahead(readahead2, buf, buflen);
|
|
|
|
/* Save the readahead buffer in the connection structure where
|
|
* it can be found with recv() is called.
|
|
*/
|
|
|
|
sq_addlast(&readahead2->rh_node, &conn->readahead);
|
|
}
|
|
|
|
/* Indicate that all of the data in the buffer has been consumed */
|
|
|
|
nvdbg("Buffered %d bytes\n", dev->d_len);
|
|
dev->d_len = 0;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
/* There is no handler to receive new data and there are no free
|
|
* read-ahead buffers to retain the data. In this case, clear the
|
|
* UIP_NEWDATA bit so that no ACK will be sent and drop the packet.
|
|
*/
|
|
|
|
#ifdef CONFIG_NET_STATISTICS
|
|
uip_stat.tcp.syndrop++;
|
|
uip_stat.tcp.drop++;
|
|
#endif
|
|
ret &= ~UIP_NEWDATA;
|
|
dev->d_len = 0;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Function: uip_tcpcallback
|
|
*
|
|
* Description:
|
|
* Inform the application holding the TCP socket of a change in state.
|
|
*
|
|
* Assumptions:
|
|
* This function is called at the interrupt level with interrupts disabled.
|
|
*
|
|
****************************************************************************/
|
|
|
|
uint8 uip_tcpcallback(struct uip_driver_s *dev, struct uip_conn *conn, uint8 flags)
|
|
{
|
|
/* Preserve the UIP_ACKDATA, UIP_CLOSE, and UIP_ABORT in the response.
|
|
* These is needed by uIP to handle responses and buffer state. The
|
|
* UIP_NEWDATA indication will trigger the ACK response, but must be
|
|
* explicitly set in the callback.
|
|
*/
|
|
|
|
uint8 ret = flags;
|
|
|
|
nvdbg("flags: %02x\n", flags);
|
|
|
|
/* Check if there is a data callback */
|
|
|
|
if (conn->data_event)
|
|
{
|
|
/* Perform the callback. Callback function normally returns the input flags,
|
|
* however, the implementation may set one of the following:
|
|
*
|
|
* UIP_CLOSE - Gracefully close the current connection
|
|
* UIP_ABORT - Abort (reset) the current connection on an error that
|
|
* prevents UIP_CLOSE from working.
|
|
*
|
|
* Or clear the following:
|
|
*
|
|
* UIP_NEWDATA - May be cleared to suppress returning the ACK response.
|
|
* (dev->d_len should also be set to zero in this case).
|
|
*/
|
|
|
|
ret = conn->data_event(dev, conn, flags);
|
|
}
|
|
|
|
/* If there is no data callback -OR- if the data callback does not handle the
|
|
* newdata event, then there is no handler in place to handle new incoming data.
|
|
*/
|
|
|
|
if (!conn->data_event || (conn->data_flags & UIP_NEWDATA) == 0)
|
|
{
|
|
/* In either case, we will take a default newdata action */
|
|
|
|
nvdbg("No listener on connection\n");
|
|
ret = uip_dataevent(dev, conn, ret);
|
|
}
|
|
|
|
/* Check if there is a connection-related event and a connection
|
|
* callback.
|
|
*/
|
|
|
|
if (((flags & UIP_CONN_EVENTS) != 0) && conn->connection_event)
|
|
{
|
|
/* Perform the callback */
|
|
|
|
conn->connection_event(conn, flags);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#endif /* CONFIG_NET && CONFIG_NET_TCP */
|