ac5b2ea049
net/tcp: Remove g_netstats.tcp.syndrop++ from tcp_data_event() Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com> Approved-by: GregoryN <gnutt@nuttx.org>
282 lines
9.3 KiB
C
282 lines
9.3 KiB
C
/****************************************************************************
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* net/tcp/tcp_callback.c
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*
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* Copyright (C) 2007-2009, 2014, 2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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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#include <stdint.h>
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#include <string.h>
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#include <debug.h>
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#include <nuttx/mm/iob.h>
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#include <nuttx/net/netconfig.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/netstats.h>
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#include "devif/devif.h"
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#include "tcp/tcp.h"
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#ifdef NET_TCP_HAVE_STACK
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: tcp_data_event
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*
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* Description:
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* Handle data that is not accepted by the application because there is no
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* listener in place ready to receive the data.
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*
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* Assumptions:
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* - The caller has checked that TCP_NEWDATA is set in flags and that is no
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* other handler available to process the incoming data.
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* - This function must be called with the network locked.
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*
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****************************************************************************/
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static inline uint16_t
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tcp_data_event(FAR struct net_driver_s *dev, FAR struct tcp_conn_s *conn,
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uint16_t flags)
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{
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uint16_t ret;
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/* Assume that we will ACK the data. The data will be ACKed if it is
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* placed in the read-ahead buffer -OR- if it zero length
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*/
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ret = (flags & ~TCP_NEWDATA) | TCP_SNDACK;
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/* Is there new data? With non-zero length? (Certain connection events
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* can have zero-length with TCP_NEWDATA set just to cause an ACK).
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*/
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if (dev->d_len > 0)
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{
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#ifdef CONFIG_NET_TCP_READAHEAD
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uint8_t *buffer = dev->d_appdata;
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int buflen = dev->d_len;
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uint16_t recvlen;
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#endif
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ninfo("No listener on connection\n");
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#ifdef CONFIG_NET_TCP_READAHEAD
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/* Save as the packet data as in the read-ahead buffer. NOTE that
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* partial packets will not be buffered.
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*/
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recvlen = tcp_datahandler(conn, buffer, buflen);
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if (recvlen < buflen)
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#endif
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{
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/* There is no handler to receive new data and there are no free
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* read-ahead buffers to retain the data -- drop the packet.
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*/
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ninfo("Dropped %d bytes\n", dev->d_len);
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#ifdef CONFIG_NET_STATISTICS
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g_netstats.tcp.drop++;
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#endif
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/* Clear the TCP_SNDACK bit so that no ACK will be sent */
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ret &= ~TCP_SNDACK;
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}
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}
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/* In any event, the new data has now been handled */
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dev->d_len = 0;
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return ret;
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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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* Name: tcp_callback
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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 must be called with the network locked.
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*
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****************************************************************************/
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uint16_t tcp_callback(FAR struct net_driver_s *dev,
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FAR struct tcp_conn_s *conn, uint16_t flags)
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{
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/* Preserve the TCP_ACKDATA, TCP_CLOSE, and TCP_ABORT in the response.
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* These is needed by the network to handle responses and buffer state. The
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* TCP_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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ninfo("flags: %04x\n", flags);
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/* Perform the data callback. When a data callback is executed from 'list',
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* the input flags are normally returned, however, the implementation
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* may set one of the following:
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*
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* TCP_CLOSE - Gracefully close the current connection
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* TCP_ABORT - Abort (reset) the current connection on an error that
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* prevents TCP_CLOSE from working.
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*
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* And/Or set/clear the following:
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*
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* TCP_NEWDATA - May be cleared to indicate that the data was consumed
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* and that no further process of the new data should be
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* attempted.
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* TCP_SNDACK - If TCP_NEWDATA is cleared, then TCP_SNDACK may be set
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* to indicate that an ACK should be included in the response.
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* (In TCP_NEWDATA is cleared but TCP_SNDACK is not set, then
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* dev->d_len should also be cleared).
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*/
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flags = devif_conn_event(dev, conn, flags, conn->list);
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/* There may be no new data handler in place at them moment that the new
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* incoming data is received. If the new incoming data was not handled, then
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* either (1) put the unhandled incoming data in the read-ahead buffer (if
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* enabled) or (2) suppress the ACK to the data in the hope that it will
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* be re-transmitted at a better time.
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*/
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if ((flags & TCP_NEWDATA) != 0)
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{
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/* Data was not handled.. dispose of it appropriately */
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flags = tcp_data_event(dev, conn, flags);
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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 & TCP_CONN_EVENTS) != 0)
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{
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/* Perform the callback disconnect callbacks */
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flags = devif_conn_event(dev, conn, flags, conn->connevents);
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}
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return flags;
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}
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/****************************************************************************
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* Name: tcp_datahandler
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*
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* Description:
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* Handle data that is not accepted by the application. This may be called
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* either (1) from the data receive logic if it cannot buffer the data, or
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* (2) from the TCP event logic is there is no listener in place ready to
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* receive the data.
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*
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* Input Parameters:
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* conn - A pointer to the TCP connection structure
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* buffer - A pointer to the buffer to be copied to the read-ahead
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* buffers
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* buflen - The number of bytes to copy to the read-ahead buffer.
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*
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* Returned Value:
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* The number of bytes actually buffered is returned. This will be either
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* zero or equal to buflen; partial packets are not buffered.
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*
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* Assumptions:
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* - The caller has checked that TCP_NEWDATA is set in flags and that is no
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* other handler available to process the incoming data.
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* - This function must be called with the network locked.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_TCP_READAHEAD
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uint16_t tcp_datahandler(FAR struct tcp_conn_s *conn, FAR uint8_t *buffer,
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uint16_t buflen)
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{
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FAR struct iob_s *iob;
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int ret;
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/* Try to allocate on I/O buffer to start the chain without waiting (and
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* throttling as necessary). If we would have to wait, then drop the
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* packet.
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*/
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iob = iob_tryalloc(true);
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if (iob == NULL)
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{
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nerr("ERROR: Failed to create new I/O buffer chain\n");
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return 0;
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}
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/* Copy the new appdata into the I/O buffer chain (without waiting) */
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ret = iob_trycopyin(iob, buffer, buflen, 0, true);
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if (ret < 0)
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{
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/* On a failure, iob_copyin return a negated error value but does
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* not free any I/O buffers.
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*/
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nerr("ERROR: Failed to add data to the I/O buffer chain: %d\n", ret);
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(void)iob_free_chain(iob);
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return 0;
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}
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/* Add the new I/O buffer chain to the tail of the read-ahead queue (again
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* without waiting).
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*/
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ret = iob_tryadd_queue(iob, &conn->readahead);
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if (ret < 0)
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{
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nerr("ERROR: Failed to queue the I/O buffer chain: %d\n", ret);
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(void)iob_free_chain(iob);
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return 0;
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}
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ninfo("Buffered %d bytes\n", buflen);
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return buflen;
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}
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#endif /* CONFIG_NET_TCP_READAHEAD */
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#endif /* NET_TCP_HAVE_STACK */
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