--- /dev/null
+/*
+ * 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 __VOM_NAT_BINDING_H__
+#define __VOM_NAT_BINDING_H__
+
+#include "vom/hw.hpp"
+#include "vom/interface.hpp"
+#include "vom/object_base.hpp"
+#include "vom/om.hpp"
+#include "vom/singular_db.hpp"
+
+namespace VOM {
+/**
+ * A Class representing the binding of an L2 interface to a bridge-domain
+ * and the properties of that binding.
+ */
+class nat_binding : public object_base
+{
+public:
+ /**
+ * NAT Zoness
+ */
+ struct zone_t : public enum_base<zone_t>
+ {
+ /**
+ * Constructor
+ */
+ zone_t(int v, const std::string s);
+
+ /**
+ * Destructor
+ */
+ ~zone_t() = default;
+
+ /**
+ * Permit Zone
+ */
+ const static zone_t INSIDE;
+
+ /**
+ * Deny Zone
+ */
+ const static zone_t OUTSIDE;
+
+ const static zone_t& from_vpp(u8 is_inside);
+ };
+
+ /**
+ * The key for a NAT Binding.
+ * The zoe is not included, since the same interface is never inside
+ * and outside.
+ */
+ typedef std::tuple<interface::key_t, direction_t, l3_proto_t> key_t;
+
+ /**
+ * Construct a new object matching the desried state
+ * @param itf The interface onto which we bind/apply the feature
+ * @param dir The direction (input/output)
+ * @param proto The L3 proto used inside.
+ * @param zone The NAT zone for the link
+ */
+ nat_binding(const interface& itf,
+ const direction_t& dir,
+ const l3_proto_t& proto,
+ const zone_t& zone);
+
+ /**
+ * Copy Constructor
+ */
+ nat_binding(const nat_binding& o);
+
+ /**
+ * Destructor
+ */
+ ~nat_binding();
+
+ /**
+ * Comparison operator - for UT
+ */
+ bool operator==(const nat_binding& n) const;
+
+ /**
+ * Return the binding's key
+ */
+ const key_t key() const;
+
+ /**
+ * Return the 'singular instance' of the L2 config that matches this
+ * object
+ */
+ std::shared_ptr<nat_binding> singular() const;
+
+ /**
+ * convert to string format for debug purposes
+ */
+ std::string to_string() const;
+
+ /**
+ * Static function to find the bridge_domain in the model
+ */
+ static std::shared_ptr<nat_binding> find(const key_t& key);
+
+ /**
+ * Dump all nat_bindings into the stream provided
+ */
+ static void dump(std::ostream& os);
+
+private:
+ /**
+ * Class definition for listeners to OM events
+ */
+ class event_handler : public OM::listener, public inspect::command_handler
+ {
+ public:
+ event_handler();
+ virtual ~event_handler() = default;
+
+ /**
+ * Handle a populate event
+ */
+ void handle_populate(const client_db::key_t& key);
+
+ /**
+ * Handle a replay event
+ */
+ void handle_replay();
+
+ /**
+ * Show the object in the Singular DB
+ */
+ void show(std::ostream& os);
+
+ /**
+ * Get the sortable Id of the listener
+ */
+ dependency_t order() const;
+ };
+
+ /**
+ * event_handler to register with OM
+ */
+ static event_handler m_evh;
+
+ /**
+ * Enquue commonds to the VPP command Q for the update
+ */
+ void update(const nat_binding& obj);
+
+ /**
+ * Find or Add the singular instance in the DB
+ */
+ static std::shared_ptr<nat_binding> find_or_add(const nat_binding& temp);
+
+ /*
+ * It's the OM class that calls singular()
+ */
+ friend class OM;
+
+ /**
+ * It's the singular_db class that calls replay()
+ */
+ friend class singular_db<const key_t, nat_binding>;
+
+ /**
+ * Sweep/reap the object if still stale
+ */
+ void sweep(void);
+
+ /**
+ * replay the object to create it in hardware
+ */
+ void replay(void);
+
+ /**
+ * HW configuration for the binding. The bool representing the
+ * do/don't bind.
+ */
+ HW::item<bool> m_binding;
+
+ /**
+ * A reference counting pointer the interface that this NAT binding
+ * represents. By holding the reference here, we can guarantee that
+ * this object will outlive the interface
+ */
+ const std::shared_ptr<interface> m_itf;
+
+ /**
+ * The direction in which the feature applies
+ */
+ direction_t m_dir;
+
+ /**
+ * The L3 protocol used on the inside
+ */
+ l3_proto_t m_proto;
+
+ /**
+ * The NAT zone the interface is in
+ */
+ zone_t m_zone;
+
+ /**
+ * A map of all L2 interfaces key against the interface's handle_t
+ */
+ static singular_db<const key_t, nat_binding> m_db;
+};
+
+std::ostream& operator<<(std::ostream& os, const nat_binding::key_t& key);
+};
+
+/*
+ * fd.io coding-style-patch-verification: OFF
+ *
+ * Local Variables:
+ * eval: (c-set-style "mozilla")
+ * End:
+ */
+
+#endif
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