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nuttx/net/netdev/netdev_findbyaddr.c
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/****************************************************************************
* net/netdev/netdev_findbyaddr.c
*
* Copyright (C) 2007-2009, 2014-2015, 2017-2018 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>
#include <stdbool.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <netinet/in.h>
#include <nuttx/net/netdev.h>
#include <nuttx/net/ip.h>
#include "utils/utils.h"
#include "devif/devif.h"
#include "inet/inet.h"
#include "route/route.h"
#include "netdev/netdev.h"
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: netdev_findby_lipv4addr
*
* Description:
* Find a previously registered network device by matching a local address
* with the subnet served by the device. Only "up" devices are considered
* (since a "down" device has no meaningful address).
*
* Input Parameters:
* lipaddr - Local, IPv4 address assigned to the network device. Or any
* IPv4 address on the sub-net served by the network device.
*
* Returned Value:
* Pointer to driver on success; null on failure
*
****************************************************************************/
#ifdef CONFIG_NET_IPv4
FAR struct net_driver_s *netdev_findby_lipv4addr(in_addr_t lipaddr)
{
FAR struct net_driver_s *dev;
/* Examine each registered network device */
net_lock();
for (dev = g_netdevices; dev; dev = dev->flink)
{
/* Is the interface in the "up" state? */
if ((dev->d_flags & IFF_UP) != 0)
{
/* Yes.. check for an address match (under the netmask) */
if (net_ipv4addr_maskcmp(dev->d_ipaddr, lipaddr,
dev->d_netmask))
{
/* Its a match */
net_unlock();
return dev;
}
}
}
/* No device with the matching address found */
net_unlock();
return NULL;
}
#endif /* CONFIG_NET_IPv4 */
/****************************************************************************
* Name: netdev_findby_lipv6addr
*
* Description:
* Find a previously registered network device by matching a local address
* with the subnet served by the device. Only "up" devices are considered
* (since a "down" device has no meaningful address).
*
* Input Parameters:
* lipaddr - Local, IPv6 address assigned to the network device. Or any
* IPv6 address on the sub-net served by the network device.
*
* Returned Value:
* Pointer to driver on success; null on failure
*
****************************************************************************/
#ifdef CONFIG_NET_IPv6
FAR struct net_driver_s *netdev_findby_lipv6addr(const net_ipv6addr_t lipaddr)
{
FAR struct net_driver_s *dev;
/* Examine each registered network device */
net_lock();
for (dev = g_netdevices; dev; dev = dev->flink)
{
/* Is the interface in the "up" state? */
if ((dev->d_flags & IFF_UP) != 0)
{
/* Yes.. check for an address match (under the netmask) */
if (net_ipv6addr_maskcmp(dev->d_ipv6addr, lipaddr,
dev->d_ipv6netmask))
{
/* Its a match */
net_unlock();
return dev;
}
}
}
/* No device with the matching address found */
net_unlock();
return NULL;
}
#endif /* CONFIG_NET_IPv6 */
/****************************************************************************
* Name: netdev_findby_ripv4addr
*
* Description:
* Find a previously registered network device by matching the remote
* IPv4 address that can be reached by the device.
*
* Input Parameters:
* lipaddr - Local, bound address of a connection (used only if ripaddr is
* the broadcast address).
* ripaddr - Remote address of a connection to use in the lookup
*
* Returned Value:
* Pointer to driver on success; null on failure
*
****************************************************************************/
#ifdef CONFIG_NET_IPv4
FAR struct net_driver_s *netdev_findby_ripv4addr(in_addr_t lipaddr,
in_addr_t ripaddr)
{
struct net_driver_s *dev;
#ifdef CONFIG_NET_ROUTE
in_addr_t router;
int ret;
#endif
/* First, check if this is the broadcast IP address */
if (net_ipv4addr_cmp(ripaddr, INADDR_BROADCAST))
{
/* Yes.. Check the local, bound address. Is it INADDR_ANY? */
if (net_ipv4addr_cmp(lipaddr, INADDR_ANY))
{
/* Yes.. In this case, I think we are supposed to send the
* broadcast packet out ALL locally available networks. I am not
* sure of that and, in any event, there is nothing we can do
* about that here.
*/
return netdev_default();
}
else
{
/* Return the device associated with the local address */
return netdev_findby_lipv4addr(lipaddr);
}
}
/* Check if the address maps to a locally available network */
dev = netdev_findby_lipv4addr(ripaddr);
if (dev)
{
return dev;
}
/* No.. The address lies on an external network */
#ifdef CONFIG_NET_ROUTE
/* If we have a routing table, then perhaps we can find the local
* address of a router that can forward packets to the external network.
*/
ret = net_ipv4_router(ripaddr, &router);
if (ret >= 0)
{
/* Success... try to find the network device associated with the local
* router address
*/
dev = netdev_findby_lipv4addr(router);
if (dev)
{
return dev;
}
}
#endif /* CONFIG_NET_ROUTE */
/* The above lookup will fail if the packet is being sent out of our
* out subnet to a router and there is no routing information. Let's
* try the default network device.
*/
return netdev_default();
}
#endif /* CONFIG_NET_IPv4 */
/****************************************************************************
* Name: netdev_findby_ripv6addr
*
* Description:
* Find a previously registered network device by matching the remote
* IPv6 address that can be reached by the device.
*
* Input Parameters:
* lipaddr - Local, bound address of a connection (used only if ripaddr is
* a multicast address).
* ripaddr - Remote address of a connection to use in the lookup
*
* Returned Value:
* Pointer to driver on success; null on failure
*
****************************************************************************/
#ifdef CONFIG_NET_IPv6
FAR struct net_driver_s *netdev_findby_ripv6addr(const net_ipv6addr_t lipaddr,
const net_ipv6addr_t ripaddr)
{
struct net_driver_s *dev;
#ifdef CONFIG_NET_ROUTE
net_ipv6addr_t router;
int ret;
#endif
/* First, check if this is the multicast IP address */
if (net_is_addr_mcast(ripaddr))
{
/* Yes.. Check the local, bound address. Is it the IPv6 unspecified
* address?
*/
if (net_ipv6addr_cmp(lipaddr, g_ipv6_unspecaddr))
{
/* Yes.. In this case, I think we are supposed to send the
* broadcast packet out ALL locally available networks. I am not
* sure of that and, in any event, there is nothing we can do
* about that here.
*/
return netdev_default();
}
else
{
/* Return the device associated with the local address */
return netdev_findby_lipv6addr(lipaddr);
}
}
/* Check if the address maps to a locally available network */
dev = netdev_findby_lipv6addr(ripaddr);
if (dev)
{
return dev;
}
/* No.. The address lies on an external network */
#ifdef CONFIG_NET_ROUTE
/* If we have a routing table, then perhaps we can find the local
* address of a router that can forward packets to the external network.
*/
ret = net_ipv6_router(ripaddr, router);
if (ret >= 0)
{
/* Success... try to find the network device associated with the local
* router address
*/
dev = netdev_findby_lipv6addr(router);
if (dev)
{
return dev;
}
}
#endif /* CONFIG_NET_ROUTE */
/* The above lookup will fail if the packet is being sent out of our
* out subnet to a router and there is no routing information. Let's
* try the default network device.
*/
return netdev_default();
}
#endif /* CONFIG_NET_IPv6 */
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