nuttx/net/tcp/tcp_finddev.c

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/****************************************************************************
* net/tcp/tcp_finddev.c
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#if defined(CONFIG_NET) && defined(CONFIG_NET_TCP)
#include <string.h>
#include <errno.h>
#include <nuttx/net/netdev.h>
#include <nuttx/net/ip.h>
#include "netdev/netdev.h"
#include "inet/inet.h"
#include "tcp/tcp.h"
#include "utils/utils.h"
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: tcp_find_ipv4_device
*
* Description:
* Select the network driver to use with the IPv4 TCP connection.
*
* Input Parameters:
* conn - TCP connection structure.
* addr - The IPv4 address to use
*
* Returned Value:
* 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.
*
****************************************************************************/
#ifdef CONFIG_NET_IPv4
static int tcp_find_ipv4_device(FAR struct tcp_conn_s *conn,
in_addr_t addr, bool local)
{
/* Do nothing if a device is already bound to the connection */
if (conn->dev != NULL)
{
return OK;
}
/* Return success without using device notification if the locally bound
* address is INADDR_ANY. In this case, there may be multiple devices
* that can provide data so the exceptional events from any particular
* device are not important.
*/
if (net_ipv4addr_cmp(addr, INADDR_ANY))
{
if (local)
{
#ifdef CONFIG_NET_BINDTODEVICE
if (conn->sconn.s_boundto != 0)
{
conn->dev = netdev_findbyindex(conn->sconn.s_boundto);
}
#endif
return OK;
}
return -ECONNREFUSED;
}
/* We need to select the device that is going to route the TCP packet
* based on the provided IP address.
*/
conn->dev = netdev_findby_ripv4addr(addr, addr);
/* Return success if we found the device */
return conn->dev != NULL ? OK : -ENETUNREACH;
}
#endif /* CONFIG_NET_IPv4 */
/****************************************************************************
* Name: tcp_find_ipv6_device
*
* Description:
* Select the network driver to use with the IPv6 TCP transaction.
*
* Input Parameters:
* conn - TCP connection structure.
* addr - The IPv6 address to use
*
* Returned Value:
* Zero (OK) is returned on success. A negated errno value is returned
* on failure. -ENETUNREACH is the only expected error value.
*
****************************************************************************/
#ifdef CONFIG_NET_IPv6
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static int tcp_find_ipv6_device(FAR struct tcp_conn_s *conn,
const net_ipv6addr_t addr, bool local)
{
/* Do nothing if a device is already bound to the connection */
if (conn->dev != NULL)
{
return OK;
}
/* Return success without using device notification if the locally bound
* address is the IPv6 unspecified address. In this case, there may be
* multiple devices* that can provide data so the exceptional events from
* any particular device are not important.
*/
if (net_ipv6addr_cmp(addr, g_ipv6_unspecaddr))
{
if (local)
{
#ifdef CONFIG_NET_BINDTODEVICE
if (conn->sconn.s_boundto != 0)
{
conn->dev = netdev_findbyindex(conn->sconn.s_boundto);
}
#endif
return OK;
}
return -ECONNREFUSED;
}
/* We need to select the device that is going to route the TCP packet
* based on the provided IP address.
*/
conn->dev = netdev_findby_ripv6addr(addr, addr);
/* Return success if we found the device */
return conn->dev != NULL ? OK : -ENETUNREACH;
}
#endif /* CONFIG_NET_IPv6 */
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: tcp_local_ipv4_device
*
* Description:
* Select the network driver to use with the IPv4 TCP transaction based
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* on the locally bound IPv4 address.
*
* Input Parameters:
* conn - TCP connection structure. The locally bound address, laddr,
* should be set to a non-zero value in this structure.
*
* Returned Value:
* 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.
*
****************************************************************************/
#ifdef CONFIG_NET_IPv4
int tcp_local_ipv4_device(FAR struct tcp_conn_s *conn)
{
return tcp_find_ipv4_device(conn, conn->u.ipv4.laddr, true);
}
#endif /* CONFIG_NET_IPv4 */
/****************************************************************************
* Name: tcp_remote_ipv4_device
*
* Description:
* Select the network driver to use with the IPv4 TCP transaction based
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* on the remotely connected IPv4 address.
*
* Input Parameters:
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* conn - TCP connection structure. The remotely connected address, raddr,
* should be set to a non-zero value in this structure.
*
* Returned Value:
* 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.
*
****************************************************************************/
#ifdef CONFIG_NET_IPv4
int tcp_remote_ipv4_device(FAR struct tcp_conn_s *conn)
{
return tcp_find_ipv4_device(conn, conn->u.ipv4.raddr, false);
}
#endif
/****************************************************************************
* Name: tcp_local_ipv6_device
*
* Description:
* Select the network driver to use with the IPv6 TCP transaction.
*
* Input Parameters:
* conn - TCP connection structure. The locally bound address, laddr,
* should be set to a non-zero value in this structure.
*
* Returned Value:
* Zero (OK) is returned on success. A negated errno value is returned
* on failure. -ENETUNREACH is the only expected error value.
*
****************************************************************************/
#ifdef CONFIG_NET_IPv6
int tcp_local_ipv6_device(FAR struct tcp_conn_s *conn)
{
return tcp_find_ipv6_device(conn, conn->u.ipv6.laddr, true);
}
#endif /* CONFIG_NET_IPv6 */
/****************************************************************************
* Name: tcp_remote_ipv6_device
*
* Description:
* Select the network driver to use with the IPv6 TCP transaction based
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* on the remotely connected IPv6 address.
*
* Input Parameters:
* conn - TCP connection structure. The remotely connected address, raddr,
* should be set to a non-zero value in this structure.
*
* Returned Value:
* Zero (OK) is returned on success. A negated errno value is returned
* on failure. -EHOSTUNREACH is the only expected error value.
*
****************************************************************************/
#ifdef CONFIG_NET_IPv6
int tcp_remote_ipv6_device(FAR struct tcp_conn_s *conn)
{
return tcp_find_ipv6_device(conn, conn->u.ipv6.raddr, false);
}
#endif /* CONFIG_NET_IPv6 */
#endif /* CONFIG_NET && CONFIG_NET_TCP */