130 lines
4.7 KiB
C
130 lines
4.7 KiB
C
/****************************************************************************
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* net/netdev_findbyaddr.c
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*
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* Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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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#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
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#include <sys/types.h>
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#include <string.h>
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#include <errno.h>
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#include <debug.h>
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#include <net/uip/uip-arch.h>
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#include "net_internal.h"
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/****************************************************************************
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* Definitions
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****************************************************************************/
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/****************************************************************************
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* Priviate Types
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Function: netdev_maskcmp
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****************************************************************************/
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static inline boolean netdev_maskcmp(const uip_ipaddr_t *ipaddr,
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const uip_ipaddr_t *raddr,
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const uip_ipaddr_t *netmask)
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{
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#ifndef CONFIG_NET_IPv6
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return (*ipaddr & *netmask) == (*raddr & *netmask);
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#else
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# warning "Not implemented for IPv6"
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#endif
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}
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/****************************************************************************
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* Global Functions
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****************************************************************************/
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/****************************************************************************
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* Function: netdev_findbyaddr
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*
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* Description:
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* Find a previously registered network device by matching a remote address
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* with the subnet served by the device
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*
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* Parameters:
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* raddr - Pointer to the remote address of a connection
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*
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* Returned Value:
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* Pointer to driver on success; null on failure
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*
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* Assumptions:
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* Called from normal user mode
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*
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****************************************************************************/
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FAR struct uip_driver_s *netdev_findbyaddr(const uip_ipaddr_t *raddr)
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{
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struct uip_driver_s *dev;
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if (raddr)
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{
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netdev_semtake();
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for (dev = g_netdevices; dev; dev = dev->flink)
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{
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if (netdev_maskcmp(&dev->d_ipaddr, raddr, &dev->d_netmask))
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{
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netdev_semgive();
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return dev;
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}
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}
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netdev_semgive();
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}
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return NULL;
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}
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#endif /* CONFIG_NET && CONFIG_NSOCKET_DESCRIPTORS */
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