Forgot to add a file in the last commit

net/tcp/tcp_finddev.c

+/****************************************************************************
+ * net/tcp/tcp_finddev.c
+ *
+ *   Copyright (C) 2015 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 <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 "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 */