255 lines
8.0 KiB
C
255 lines
8.0 KiB
C
/****************************************************************************
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* net/tcp/tcp_finddev.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 "inet/inet.h"
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#include "tcp/tcp.h"
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#include "utils/utils.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: 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,
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in_addr_t addr, bool local)
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{
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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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if (local)
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{
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conn->dev = net_bound_device(&conn->sconn);
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return OK;
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}
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return -EINVAL;
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}
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/* We need to select the device that is going to route the TCP packet
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* based on the provided IP address.
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*/
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conn->dev = netdev_findby_ripv4addr(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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}
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#endif /* CONFIG_NET_IPv4 */
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/****************************************************************************
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* Name: 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, bool local)
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{
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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 the IPv6 unspecified address. In this case, there may be
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* multiple devices* that can provide data so the exceptional events from
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* any particular device are not important.
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*/
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if (net_ipv6addr_cmp(addr, g_ipv6_unspecaddr))
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{
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if (local)
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{
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conn->dev = net_bound_device(&conn->sconn);
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return OK;
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}
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return -EINVAL;
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}
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/* We need to select the device that is going to route the TCP packet
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* based on the provided IP address.
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*/
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conn->dev = netdev_findby_ripv6addr(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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}
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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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* Name: 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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return tcp_find_ipv4_device(conn, conn->u.ipv4.laddr, true);
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}
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#endif /* CONFIG_NET_IPv4 */
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/****************************************************************************
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* Name: 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 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. -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, false);
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}
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#endif
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/****************************************************************************
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* Name: 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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return tcp_find_ipv6_device(conn, conn->u.ipv6.laddr, true);
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}
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#endif /* CONFIG_NET_IPv6 */
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/****************************************************************************
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* Name: 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 connected 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, false);
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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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