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diff --git a/src/vnet/session/application_namespace.h b/src/vnet/session/application_namespace.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.
+ */
+
+#include <vnet/vnet.h>
+
+#ifndef SRC_VNET_SESSION_APPLICATION_NAMESPACE_H_
+#define SRC_VNET_SESSION_APPLICATION_NAMESPACE_H_
+
+typedef struct _app_namespace
+{
+  /**
+   * Local sw_if_index that supports transport connections for this namespace
+   */
+  u32 sw_if_index;
+
+  /**
+   * Network namespace (e.g., fib_index associated to the sw_if_index)
+   * wherein connections are to be established. Since v4 and v6 fibs are
+   * separate, we actually need to keep pointers to both.
+   */
+  u32 ip4_fib_index;
+  u32 ip6_fib_index;
+
+  /**
+   * Local session table associated to ns
+   */
+  u32 local_table_index;
+
+  /**
+   * Secret apps need to provide to authorize attachment to the namespace
+   */
+  u64 ns_secret;
+
+  /**
+   * Application namespace id
+   */
+  u8 *ns_id;
+} app_namespace_t;
+
+typedef struct _vnet_app_namespace_add_del_args
+{
+  u8 *ns_id;
+  u64 secret;
+  u32 sw_if_index;
+  u32 ip4_fib_id;
+  u32 ip6_fib_id;
+  u8 is_add;
+} vnet_app_namespace_add_del_args_t;
+
+#define APP_NAMESPACE_INVALID_INDEX ((u32)~0)
+
+app_namespace_t *app_namespace_alloc (u8 * ns_id);
+app_namespace_t *app_namespace_get (u32 index);
+app_namespace_t *app_namespace_get_from_id (const u8 * ns_id);
+u32 app_namespace_index (app_namespace_t * app_ns);
+const u8 *app_namespace_id (app_namespace_t * app_ns);
+const u8 *app_namespace_id_from_index (u32 index);
+u32 app_namespace_index_from_id (const u8 * ns_id);
+void app_namespaces_init (void);
+clib_error_t *vnet_app_namespace_add_del (vnet_app_namespace_add_del_args_t *
+					  a);
+
+#endif /* SRC_VNET_SESSION_APPLICATION_NAMESPACE_H_ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */