282 lines
9.1 KiB
C
282 lines
9.1 KiB
C
/****************************************************************************
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* net/tcp/tcp_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_TCP)
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#include <string.h>
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#include <errno.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 "tcp/tcp.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Function: tcp_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 TCP connection.
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*
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* Input Parameters:
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* conn - TCP connection structure.
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* addr - The IPv4 address to use
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*
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* Returned Value:
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* Zero (OK) is returned on success. A negated errno value is returned
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* on failure. -ENETUNREACH is the only expected error value.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv4
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static int tcp_find_ipv4_device(FAR struct tcp_conn_s *conn, in_addr_t addr)
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{
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#ifdef CONFIG_NETDEV_MULTINIC
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/* Do nothing if a device is already bound to the connection */
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if (conn->dev != NULL)
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{
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return OK;
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}
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/* Return success without using device notification if the locally bound
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* address is INADDR_ANY. In this case, there may be multiple devices
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* that can provide data so the exceptional events from any particular
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* device are not important.
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*/
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if (net_ipv4addr_cmp(addr, INADDR_ANY))
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{
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return OK;
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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 TCP packet based on the provided IP address.
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*/
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conn->dev = netdev_findby_ipv4addr(addr, addr);
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/* Return success if we found the device */
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return conn->dev != NULL ? OK : -ENETUNREACH;
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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 != NULL) ? OK : -ENETUNREACH;
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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: tcp_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 TCP transaction.
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*
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* Input Parameters:
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* conn - TCP connection structure.
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* addr - The IPv6 address to use
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*
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* Returned Value:
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* Zero (OK) is returned on success. A negated errno value is returned
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* on failure. -ENETUNREACH is the only expected error value.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv6
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static int tcp_find_ipv6_device(FAR struct tcp_conn_s *conn,
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const net_ipv6addr_t addr)
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{
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#ifdef CONFIG_NETDEV_MULTINIC
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/* Do nothing if a device is already bound to the connection */
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if (conn->dev != NULL)
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{
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return OK;
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}
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/* Return success without using device notification if the locally bound
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* address is IN6ADDR_ANY. In this case, there may be multiple devices
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* that can provide data so the exceptional events from any particular
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* device are not important.
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*/
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if (net_ipv6addr_cmp(addr, g_ipv6_allzeroaddr))
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{
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return OK;
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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 TCP packet based on the provided IP address.
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*/
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conn->dev = netdev_findby_ipv6addr(addr, addr);
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/* Return success if we found the device */
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return conn->dev != NULL ? OK : -ENETUNREACH;
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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 != NULL) ? OK : -ENETUNREACH;
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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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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Function: tcp_local_ipv4_device
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*
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* Description:
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* Select the network driver to use with the IPv4 TCP transaction based
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* on the locally bound IPv4 address
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*
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* Input Parameters:
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* conn - TCP connection structure. The locally bound address, laddr,
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* should be set to a non-zero value in this structure.
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*
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* Returned Value:
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* Zero (OK) is returned on success. A negated errno value is returned
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* on failure. -ENETUNREACH is the only expected error value.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv4
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int tcp_local_ipv4_device(FAR struct tcp_conn_s *conn)
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{
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#ifdef CONFIG_NETDEV_MULTINIC
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return tcp_find_ipv4_device(conn, conn->u.ipv4.laddr);
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#else
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return tcp_find_ipv4_device(conn, 0);
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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: tcp_remote_ipv4_device
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*
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* Description:
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* Select the network driver to use with the IPv4 TCP transaction based
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* on the remotely connected IPv4 address
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*
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* Input Parameters:
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* conn - TCP connection structure. The remotely conected address, raddr,
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* should be set to a non-zero value in this structure.
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*
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* Returned Value:
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* Zero (OK) is returned on success. A negated errno value is returned
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* on failure. -ENETUNREACH is the only expected error value.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv4
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int tcp_remote_ipv4_device(FAR struct tcp_conn_s *conn)
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{
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return tcp_find_ipv4_device(conn, conn->u.ipv4.raddr);
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}
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#endif
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/****************************************************************************
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* Function: tcp_local_ipv6_device
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*
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* Description:
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* Select the network driver to use with the IPv6 TCP transaction.
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*
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* Input Parameters:
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* conn - TCP connection structure. The locally bound address, laddr,
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* should be set to a non-zero value in this structure.
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*
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* Returned Value:
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* Zero (OK) is returned on success. A negated errno value is returned
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* on failure. -ENETUNREACH is the only expected error value.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv6
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int tcp_local_ipv6_device(FAR struct tcp_conn_s *conn)
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{
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#ifdef CONFIG_NETDEV_MULTINIC
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return tcp_find_ipv6_device(conn, conn->u.ipv6.laddr);
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#else
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return tcp_find_ipv6_device(conn, NULL);
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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: tcp_remote_ipv6_device
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*
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* Description:
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* Select the network driver to use with the IPv6 TCP transaction based
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* on the remotely conected IPv6 address
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*
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* Input Parameters:
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* conn - TCP connection structure. The remotely connected address, raddr,
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* should be set to a non-zero value in this structure.
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*
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* Returned Value:
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* Zero (OK) is returned on success. A negated errno value is returned
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* on failure. -EHOSTUNREACH is the only expected error value.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv6
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int tcp_remote_ipv6_device(FAR struct tcp_conn_s *conn)
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{
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return tcp_find_ipv6_device(conn, conn->u.ipv6.raddr);
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}
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#endif /* CONFIG_NET_IPv6 */
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#endif /* CONFIG_NET && CONFIG_NET_TCP */
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