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diff --git a/src/vnet/session/application.h b/src/vnet/session/application.h
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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.
+ */
+
+#ifndef SRC_VNET_SESSION_APPLICATION_H_
+#define SRC_VNET_SESSION_APPLICATION_H_
+
+#include <vnet/vnet.h>
+#include <vnet/session/session.h>
+#include <vnet/session/segment_manager.h>
+
+typedef enum
+{
+  APP_SERVER,
+  APP_CLIENT,
+  APP_N_TYPES
+} application_type_t;
+
+typedef struct _stream_session_cb_vft
+{
+  /** Notify server of new segment */
+  int (*add_segment_callback) (u32 api_client_index, const u8 * seg_name,
+			       u32 seg_size);
+
+  /** Notify server of newly accepted session */
+  int (*session_accept_callback) (stream_session_t * new_session);
+
+  /* Connection request callback */
+  int (*session_connected_callback) (u32 app_index, u32 opaque,
+				     stream_session_t * s, u8 code);
+
+  /** Notify app that session is closing */
+  void (*session_disconnect_callback) (stream_session_t * s);
+
+  /** Notify app that session was reset */
+  void (*session_reset_callback) (stream_session_t * s);
+
+  /* Direct RX callback, for built-in servers */
+  int (*builtin_server_rx_callback) (stream_session_t * session);
+
+  /* Redirect connection to local server */
+  int (*redirect_connect_callback) (u32 api_client_index, void *mp);
+} session_cb_vft_t;
+
+typedef struct _application
+{
+  /** Index in server pool */
+  u32 index;
+
+  /** Flags */
+  u32 flags;
+
+  /*
+   * Binary API interface to external app
+   */
+
+  /** Binary API connection index, ~0 if internal */
+  u32 api_client_index;
+
+  /** Application listens for events on this svm queue */
+  unix_shared_memory_queue_t *event_queue;
+
+  /*
+   * Callbacks: shoulder-taps for the server/client
+   */
+
+  session_cb_vft_t cb_fns;
+
+  /*
+   * svm segment management
+   */
+  u32 connects_seg_manager;
+
+  /** Lookup tables for listeners. Value is segment manager index */
+  uword *listeners_table;
+
+  /** First segment manager has in the the first segment the application's
+   * event fifo. Depending on what the app does, it may be either used for
+   * a listener or for connects. */
+  u32 first_segment_manager;
+  u8 first_segment_manager_in_use;
+
+  /** Segment manager properties. Shared by all segment managers */
+  segment_manager_properties_t sm_properties;
+} application_t;
+
+#define APP_INVALID_SEGMENT_MANAGER_INDEX ((u32) ~0)
+
+application_t *application_new ();
+int
+application_init (application_t * app, u32 api_client_index, u64 * options,
+		  session_cb_vft_t * cb_fns);
+void application_del (application_t * app);
+application_t *application_get (u32 index);
+application_t *application_get_if_valid (u32 index);
+application_t *application_lookup (u32 api_client_index);
+u32 application_get_index (application_t * app);
+
+int
+application_start_listen (application_t * app, session_type_t session_type,
+			  transport_endpoint_t * tep, u64 * handle);
+int application_stop_listen (application_t * srv, u64 handle);
+int
+application_open_session (application_t * app, session_type_t sst,
+			  transport_endpoint_t * tep, u32 api_context);
+int application_api_queue_is_full (application_t * app);
+
+segment_manager_t *application_get_listen_segment_manager (application_t *
+							   app,
+							   stream_session_t *
+							   s);
+segment_manager_t *application_get_connect_segment_manager (application_t *
+							    app);
+int application_is_proxy (application_t * app);
+int application_add_segment_notify (u32 app_index, u32 fifo_segment_index);
+
+#endif /* SRC_VNET_SESSION_APPLICATION_H_ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */