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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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