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+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed 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.
+ */
+
+/**
+ * @file metis_UdpTunnel.h
+ * @brief Establish a tunnel to a remote system
+ *
+ * Creates a "udp tunnel" to a remote system. There must already be a local UDP listener for the
+ * local side of the connection. Because UDP is connectionless and we do not have a link protocol,
+ * the udp tunnel will go in the connection table immediately in the "up" state.
+ *
+ */
+
+#ifndef Metis_metis_UdpTunnel_h
+#define Metis_metis_UdpTunnel_h
+
+#include <ccnx/api/control/cpi_Address.h>
+#include <ccnx/forwarder/metis/core/metis_Forwarder.h>
+#include <ccnx/forwarder/metis/io/metis_Listener.h>
+#include <ccnx/forwarder/metis/io/metis_IoOperations.h>
+
+/**
+ * Establishes a connection to a remote system over UDP
+ *
+ * The remoteAddress must be of the same type (i.e. v4 or v6) as the localListener.
+ *
+ * The connection will go in the table immediately, and will be in the "up" state.
+ *
+ *
+ * @param [in] metis An allocated MetisForwarder
+ * @param [in] localListener The local receiver for UDP messages
+ * @param [in] remote Address the remote IP address for the connection, must include a destination port.
+ *
+ * @retval non-null An allocated Io Operations structure for the connection
+ * @retval null An error
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+MetisIoOperations *metisUdpTunnel_CreateOnListener(MetisForwarder *metis, MetisListenerOps *localListener, const CPIAddress *remoteAddress);
+
+/**
+ * Establishes a connection to a remote system over UDP
+ *
+ * The remoteAddress must be of the same type (i.e. v4 or v6) as the localAddress. There must be an existing UDP listener
+ * on the local address. If either of these are not true, will return NULL.
+ *
+ * The connection will go in the table immediately, and will be in the "up" state.
+ *
+ * This function will lookup the appropraite listener, then use metisUdpTunnel_CreateOnListener().
+ *
+ * @param [in] metis An allocated MetisForwarder
+ * @param [in] localAddress The local IP address and port to use for the connection
+ * @param [in] remote Address the remote IP address for the connection, must include a destination port.
+ *
+ * @retval non-null An allocated Io Operations structure for the connection
+ * @retval null An error
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+MetisIoOperations *metisUdpTunnel_Create(MetisForwarder *metis, const CPIAddress *localAddress, const CPIAddress *remoteAddress);
+
+#endif // Metis_metis_UdpTunnel_h