125 lines
4.6 KiB
C
125 lines
4.6 KiB
C
/****************************************************************************
|
|
* net/netdev/netdev_default.c
|
|
*
|
|
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* 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) && CONFIG_NSOCKET_DESCRIPTORS > 0
|
|
|
|
#include <nuttx/net/netdev.h>
|
|
#include "netdev/netdev.h"
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Types
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Public Data
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Function: netdev_maskcmp
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Function: netdev_default
|
|
*
|
|
* Description:
|
|
* Return the default network device. REVISIT: At present this function
|
|
* arbitrarily returns the first UP device at the head of the device
|
|
* list. Perhaps the default device should be a device name
|
|
* configuration option?
|
|
*
|
|
* So why is this here: It represents my current though for what to do
|
|
* if a socket is connected with INADDY_ANY. In this case, I suppose we
|
|
* should use the IP address associated with some default device???
|
|
*
|
|
* Parameters:
|
|
* NULL
|
|
*
|
|
* Returned Value:
|
|
* Pointer to default network driver on success; null on failure
|
|
*
|
|
* Assumptions:
|
|
* Called from normal user mode
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct net_driver_s *netdev_default(void)
|
|
{
|
|
FAR struct net_driver_s *dev;
|
|
|
|
/* Examine each registered network device */
|
|
|
|
netdev_semtake();
|
|
for (dev = g_netdevices; dev; dev = dev->flink)
|
|
{
|
|
/* Is the interface in the "up" state? */
|
|
|
|
if ((dev->d_flags & IFF_UP) != 0)
|
|
{
|
|
/* Return a reference to the first device we find that is in the UP
|
|
* state.
|
|
*/
|
|
|
|
netdev_semgive();
|
|
return dev;
|
|
}
|
|
}
|
|
|
|
netdev_semgive();
|
|
return NULL;
|
|
}
|
|
|
|
#endif /* CONFIG_NET */
|