316 lines
10 KiB
C
316 lines
10 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 "inet/inet.h"
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#include "udp/udp.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: upd_bound_device
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*
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* Description:
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* If the UDP socket is bound to a device, return the reference to the
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* bound device.
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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 reference to the bound device. If the retained interface index no
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* longer refers to a valid device, this function will unbind the device
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* and return an arbitrary network device at the head of the list of
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* registered devices. This supports legacy IPv4 DHCPD behavior when
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* there is only a single registered network device.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_UDP_BINDTODEVICE
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static FAR struct net_driver_s *upd_bound_device(FAR struct udp_conn_s *conn)
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{
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FAR struct net_driver_s *dev = NULL;
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/* Is the UDP socket bound to a device? */
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if (conn->boundto != 0)
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{
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/* Yes..This socket has been bound to an interface. Convert the
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* interface index into a device structure reference.
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*/
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dev = netdev_findbyindex(conn->boundto);
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if (dev == NULL)
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{
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/* No device? It must have been unregistered. Un-bind the UDP
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* socket.
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*/
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conn->boundto = 0;
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}
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}
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/* If no device was bound or the bound device is no longer valid,
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* then let's try the default network device.
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*/
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return dev == NULL ? netdev_default() : dev;
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}
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#else
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# define upd_bound_device(c) netdev_default();
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: 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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* This is currently used in the UDP network poll setup to determine
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* which device is being polled.
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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. NULL is returned if driver is
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* not bound to any local device.
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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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/* 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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/* Make sure that the socket is bound to some non-zero, local
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* address. Zero is used as an indication that the laddr is
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* uninitialized and that the socket is, hence, not bound.
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*/
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if (conn->u.ipv4.laddr == 0)
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{
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return NULL;
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}
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else
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{
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return netdev_findby_ripv4addr(conn->u.ipv4.laddr,
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conn->u.ipv4.laddr);
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}
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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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/* Make sure that the socket is bound to some non-zero, local
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* address. The IPv6 unspecified address is used as an indication
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* that the laddr is uninitialized and that the socket is, hence,
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* not bound.
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*/
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if (net_ipv6addr_cmp(conn->u.ipv6.laddr, g_ipv6_unspecaddr))
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{
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return NULL;
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}
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else
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{
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return netdev_findby_ripv6addr(conn->u.ipv6.laddr,
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conn->u.ipv6.laddr);
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}
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}
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#endif
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}
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/****************************************************************************
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* Name: 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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* This function is called for UDP sendto() in order to determine which
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* network device that the UDP pack should be sent on.
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*
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* Input Parameters:
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* conn - UDP connection structure.
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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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/* We need to select the device that is going to route the UDP packet
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* 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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/* Check if the remote, destination address is the broadcast
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* or multicast address. If this is the case, select the device
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* using the locally bound address (assuming that there is one).
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*/
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if (conn->u.ipv4.raddr == INADDR_BROADCAST ||
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IN_MULTICAST(NTOHL(conn->u.ipv4.raddr)))
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{
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/* Make sure that the socket is bound to some non-zero, local
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* address. Zero is used as an indication that the laddr is
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* uninitialized and that the socket is, hence, not bound.
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*/
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if (conn->u.ipv4.laddr == 0) /* INADDR_ANY */
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{
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/* Return the device bound to this UDP socket, if any */
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return upd_bound_device(conn);
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}
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else
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{
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return netdev_findby_ripv4addr(conn->u.ipv4.laddr,
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conn->u.ipv4.laddr);
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}
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}
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/* There is no unique device associated with the unspecified
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* address.
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*/
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else if (conn->u.ipv4.raddr != INADDR_ANY)
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{
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/* Normal lookup using the verified remote address */
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return netdev_findby_ripv4addr(conn->u.ipv4.laddr,
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conn->u.ipv4.raddr);
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}
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else
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{
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/* Not a suitable IPv4 unicast address for device lookup.
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* Return the device bound to this UDP socket, if any.
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*/
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return upd_bound_device(conn);
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}
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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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/* Check if the remote, destination address is a multicast
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* address. If this is the case, select the device
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* using the locally bound address (assuming that there is one).
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*/
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if (net_is_addr_mcast(conn->u.ipv6.raddr))
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{
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/* Make sure that the socket is bound to some non-zero, local
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* address. The IPv6 unspecified address is used as an
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* indication that the laddr is uninitialized and that the
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* socket is, hence, not bound.
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*/
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if (net_ipv6addr_cmp(conn->u.ipv6.laddr, g_ipv6_unspecaddr))
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{
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/* Return the device bound to this UDP socket, if any */
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return upd_bound_device(conn);
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}
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else
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{
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return netdev_findby_ripv6addr(conn->u.ipv6.laddr,
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conn->u.ipv6.laddr);
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}
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}
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/* There is no unique device associated with the unspecified
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* address.
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*/
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else if (!net_ipv6addr_cmp(conn->u.ipv6.raddr, g_ipv6_unspecaddr))
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{
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/* Normal lookup using the verified remote address */
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return netdev_findby_ripv6addr(conn->u.ipv6.laddr,
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conn->u.ipv6.raddr);
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}
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else
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{
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/* Not a suitable IPv6 unicast address for device lookup.
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* Return the device bound to this UDP socket, if any.
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*/
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return upd_bound_device(conn);
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}
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}
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#endif
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}
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#endif /* CONFIG_NET && CONFIG_NET_UDP */
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