137 lines
4.4 KiB
C
137 lines
4.4 KiB
C
/****************************************************************************
|
|
* net/tcp/tcp_devpoll.c
|
|
* Driver poll for the availability of TCP TX data
|
|
*
|
|
* Copyright (C) 2007-2009, 2016-2017 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* 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/netconfig.h>
|
|
#include <nuttx/net/netdev.h>
|
|
#include <nuttx/net/tcp.h>
|
|
|
|
#include "devif/devif.h"
|
|
#include "tcp/tcp.h"
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_poll
|
|
*
|
|
* Description:
|
|
* Poll a TCP connection structure for availability of TX data
|
|
*
|
|
* Parameters:
|
|
* dev - The device driver structure to use in the send operation
|
|
* conn - The TCP "connection" to poll for TX data
|
|
*
|
|
* Return:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* Called with the network locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void tcp_poll(FAR struct net_driver_s *dev, FAR struct tcp_conn_s *conn)
|
|
{
|
|
uint16_t result;
|
|
|
|
/* Discard any currently buffered data */
|
|
|
|
dev->d_len = 0;
|
|
dev->d_sndlen = 0;
|
|
|
|
/* Verify that the connection is established. */
|
|
|
|
if ((conn->tcpstateflags & TCP_STATE_MASK) == TCP_ESTABLISHED)
|
|
{
|
|
#ifdef CONFIG_NETDEV_MULTINIC
|
|
/* The TCP connection is established and, hence, should be bound
|
|
* to a device. Make sure that the polling device is the one that
|
|
* we are bound to.
|
|
*/
|
|
|
|
DEBUGASSERT(conn->dev != NULL);
|
|
if (dev == conn->dev)
|
|
#endif
|
|
{
|
|
/* Set up for the callback. We can't know in advance if the
|
|
* application is going to send a IPv4 or an IPv6 packet, so this
|
|
* setup may not actually be used.
|
|
*/
|
|
|
|
#if defined(CONFIG_NET_IPv6) && defined(CONFIG_NET_IPv4)
|
|
if (conn->domain == PF_INET)
|
|
{
|
|
tcp_ipv4_select(dev);
|
|
}
|
|
else
|
|
{
|
|
tcp_ipv6_select(dev);
|
|
}
|
|
|
|
#elif defined(CONFIG_NET_IPv4)
|
|
tcp_ipv4_select(dev);
|
|
|
|
#else /* if defined(CONFIG_NET_IPv6) */
|
|
tcp_ipv6_select(dev);
|
|
#endif
|
|
/* Perform the callback */
|
|
|
|
result = tcp_callback(dev, conn, TCP_POLL);
|
|
|
|
/* Handle the callback response */
|
|
|
|
tcp_appsend(dev, conn, result);
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif /* CONFIG_NET && CONFIG_NET_TCP */
|