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/****************************************************************************
* net/netdev_findbyaddr.c
*
* Copyright (C) 2007-2009 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 <stdbool.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/net/uip/uip-arch.h>
#include "net_internal.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Priviate Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Function: netdev_maskcmp
****************************************************************************/
static inline bool netdev_maskcmp(const uip_ipaddr_t *ipaddr,
const uip_ipaddr_t *raddr,
const uip_ipaddr_t *netmask)
{
#ifndef CONFIG_NET_IPv6
return (*ipaddr & *netmask) == (*raddr & *netmask);
#else
# warning "Not implemented for IPv6"
return false;
#endif
}
/****************************************************************************
* Global Functions
****************************************************************************/
/****************************************************************************
* Function: netdev_findbyaddr
*
* Description:
* Find a previously registered network device by matching a remote address
* with the subnet served by the device
*
* Parameters:
* raddr - Pointer to the remote address of a connection
*
* Returned Value:
* Pointer to driver on success; null on failure
*
* Assumptions:
* Called from normal user mode
*
****************************************************************************/
FAR struct uip_driver_s *netdev_findbyaddr(const uip_ipaddr_t *raddr)
{
struct uip_driver_s *dev;
if (raddr)
{
netdev_semtake();
for (dev = g_netdevices; dev; dev = dev->flink)
{
if (netdev_maskcmp(&dev->d_ipaddr, raddr, &dev->d_netmask))
{
netdev_semgive();
return dev;
}
}
netdev_semgive();
}
return NULL;
}
#endif /* CONFIG_NET && CONFIG_NSOCKET_DESCRIPTORS */
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