252 lines
7.6 KiB
C
252 lines
7.6 KiB
C
/****************************************************************************
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* net/udp/udp_finddev.c
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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) && defined(CONFIG_NET_UDP)
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#include <string.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/ip.h>
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#include "netdev/netdev.h"
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#include "udp/udp.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Function: udp_find_ipv4_device
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*
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* Description:
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* Select the network driver to use with the IPv4 UDP transaction.
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*
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* Input Parameters:
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* conn - UDP connection structure (not currently used).
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* ipv4addr - The IPv4 address to use in the device selection.
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*
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* Returned Value:
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* A pointer to the network driver to use.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv4
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FAR struct net_driver_s *udp_find_ipv4_device(FAR struct udp_conn_s *conn,
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in_addr_t ipv4addr)
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{
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#ifdef CONFIG_NETDEV_MULTINIC
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/* Return NULL if the address is INADDR_ANY. In this case, there may
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* be multiple devices that can provide data so the exceptional events
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* from any particular device are not important.
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*
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* Of course, it would be a problem if this is the remote address of
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* sendto().
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*/
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if (net_ipv4addr_cmp(ipv4addr, INADDR_ANY))
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{
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return NULL;
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}
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/* There are multiple network devices. We need to select the device that
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* is going to route the UDP packet based on the provided IP address.
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*/
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return netdev_findby_ipv4addr(conn->u.ipv4.laddr, ipv4addr);
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#else
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/* There is only a single network device... the one at the head of the
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* g_netdevices list.
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*/
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return g_netdevices;
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#endif
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}
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#endif /* CONFIG_NET_IPv4 */
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/****************************************************************************
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* Function: udp_find_ipv6_device
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*
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* Description:
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* Select the network driver to use with the IPv6 UDP transaction.
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*
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* Input Parameters:
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* conn - UDP connection structure (not currently used).
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* ipv6addr - The IPv6 address to use in the device selection.
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*
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* Returned Value:
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* A pointer to the network driver to use.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv6
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FAR struct net_driver_s *udp_find_ipv6_device(FAR struct udp_conn_s *conn,
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net_ipv6addr_t ipv6addr)
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{
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#ifdef CONFIG_NETDEV_MULTINIC
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/* Return NULL if the address is IN6ADDR_ANY. In this case, there may
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* be multiple devices that can provide data so the exceptional events
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* from any particular device are not important.
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*
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* Of course, it would be a problem if this is the remote address of
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* sendto().
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*/
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if (net_ipv6addr_cmp(ipv6addr, g_ipv6_allzeroaddr))
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{
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return NULL;
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}
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/* There are multiple network devices. We need to select the device that
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* is going to route the UDP packet based on the provided IP address.
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*/
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return netdev_findby_ipv6addr(conn->u.ipv6.laddr, ipv6addr);
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#else
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/* There is only a single network device... the one at the head of the
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* g_netdevices list.
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*/
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return g_netdevices;
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#endif
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}
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#endif /* CONFIG_NET_IPv6 */
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/****************************************************************************
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* Function: udp_find_laddr_device
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*
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* Description:
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* Select the network driver to use with the UDP transaction using the
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* locally bound IP address.
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*
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* Input Parameters:
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* conn - UDP connection structure (not currently used).
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*
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* Returned Value:
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* A pointer to the network driver to use.
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*
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****************************************************************************/
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FAR struct net_driver_s *udp_find_laddr_device(FAR struct udp_conn_s *conn)
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{
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#ifdef CONFIG_NETDEV_MULTINIC
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/* There are multiple network devices. We need to select the device that
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* is going to route the UDP packet based on the provided IP address.
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*/
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#ifdef CONFIG_NET_IPv4
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#ifdef CONFIG_NET_IPv6
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if (conn->domain == PF_INET)
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#endif
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{
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return udp_find_ipv4_device(conn, conn->u.ipv4.laddr);
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}
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#endif
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#ifdef CONFIG_NET_IPv6
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#ifdef CONFIG_NET_IPv4
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else
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#endif
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{
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return udp_find_ipv6_device(conn, conn->u.ipv6.laddr);
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}
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#endif
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#else
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/* There is only a single network device... the one at the head of the
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* g_netdevices list.
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*/
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return g_netdevices;
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#endif
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}
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/****************************************************************************
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* Function: udp_find_raddr_device
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*
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* Description:
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* Select the network driver to use with the UDP transaction using the
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* remote IP address.
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*
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* Input Parameters:
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* conn - UDP connection structure (not currently used).
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*
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* Returned Value:
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* A pointer to the network driver to use.
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*
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****************************************************************************/
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FAR struct net_driver_s *udp_find_raddr_device(FAR struct udp_conn_s *conn)
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{
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#ifdef CONFIG_NETDEV_MULTINIC
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/* There are multiple network devices. We need to select the device that
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* is going to route the UDP packet based on the provided IP address.
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*/
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#ifdef CONFIG_NET_IPv4
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#ifdef CONFIG_NET_IPv6
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if (conn->domain == PF_INET)
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#endif
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{
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return udp_find_ipv4_device(conn, conn->u.ipv4.raddr);
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}
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#endif
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#ifdef CONFIG_NET_IPv6
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#ifdef CONFIG_NET_IPv4
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else
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#endif
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{
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return udp_find_ipv6_device(conn, conn->u.ipv6.raddr);
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}
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#endif
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#else
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/* There is only a single network device... the one at the head of the
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* g_netdevices list.
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*/
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return g_netdevices;
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#endif
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}
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#endif /* CONFIG_NET && CONFIG_NET_UDP */
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