diff --git a/net/tcp/tcp_finddev.c b/net/tcp/tcp_finddev.c new file mode 100644 index 00000000000..fc198e66ad6 --- /dev/null +++ b/net/tcp/tcp_finddev.c @@ -0,0 +1,170 @@ +/**************************************************************************** + * net/tcp/tcp_finddev.c + * + * Copyright (C) 2015 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include +#if defined(CONFIG_NET) && defined(CONFIG_NET_TCP) + +#include +#include + +#include +#include + +#include "netdev/netdev.h" +#include "tcp/tcp.h" + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Function: tcp_find_ipv4_device + * + * Description: + * Select the network driver to use with the IPv4 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_IPv4 +int tcp_find_ipv4_device(FAR struct tcp_conn_s *conn) +{ +#ifdef CONFIG_NETDEV_MULTINIC + /* 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(conn->u.ipv4.laddr, INADDR_ANY)) + { + conn->dev = NULL; + return OK; + } + + /* There are multiple network devices. We need to select the device that + * is going to route the TCP packet based on the provided IP address. + */ + + conn->dev = netdev_findby_ipv4addr(conn->u.ipv4.laddr, + conn->u.ipv4.laddr); + + /* Return success if we found the device */ + + return conn->dev != NULL ? OK : -ENETUNREACH; + +#else + /* There is only a single network device... the one at the head of the + * g_netdevices list. + */ + + return (g_netdevices != NULL) ? OK : -ENETUNREACH; +#endif +} +#endif /* CONFIG_NET_IPv4 */ + +/**************************************************************************** + * Function: tcp_find_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_find_ipv6_device(FAR struct tcp_conn_s *conn) +{ +#ifdef CONFIG_NETDEV_MULTINIC + /* Return success without using device notification if the locally bound + * address is IN6ADDR_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_ipv6addr_cmp(conn->u.ipv6.laddr, g_ipv6_allzeroaddr)) + { + conn->dev = NULL; + return OK; + } + + /* There are multiple network devices. We need to select the device that + * is going to route the TCP packet based on the provided IP address. + */ + + conn->dev = netdev_findby_ipv6addr(conn->u.ipv6.laddr, + conn->u.ipv6.laddr); + + /* Return success if we found the device */ + + return conn->dev != NULL ? OK : -ENETUNREACH; +#else + /* There is only a single network device... the one at the head of the + * g_netdevices list. + */ + + return (g_netdevices != NULL) ? OK : -ENETUNREACH; +#endif + +} +#endif /* CONFIG_NET_IPv6 */ + +#endif /* CONFIG_NET && CONFIG_NET_TCP */