[ONOS-6208]Implemention of onos and loxi for OVS NAT and connection tracking support

Change-Id: I782422d41fdacc805b523b57c3bd0b6e67e483a2
diff --git a/drivers/default/src/main/java/org/onosproject/driver/extensions/NiciraCt.java b/drivers/default/src/main/java/org/onosproject/driver/extensions/NiciraCt.java
new file mode 100644
index 0000000..62e7506
--- /dev/null
+++ b/drivers/default/src/main/java/org/onosproject/driver/extensions/NiciraCt.java
@@ -0,0 +1,187 @@
+/*
+ * Copyright 2017-present Open Networking Laboratory
+ *
+ * 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.
+ */
+
+package org.onosproject.driver.extensions;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.collect.Maps;
+import org.onlab.util.KryoNamespace;
+import org.onosproject.net.flow.AbstractExtension;
+import org.onosproject.net.flow.instructions.ExtensionTreatment;
+import org.onosproject.net.flow.instructions.ExtensionTreatmentType;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+
+/**
+ * Nicira ct extension instruction.
+ */
+public class NiciraCt extends AbstractExtension implements ExtensionTreatment {
+
+    private int flags;
+    private long zoneSrc;
+    private int zone;
+    private short recircTable;
+    private int alg;
+    private List<ExtensionTreatment> nestedActions;
+    private final KryoNamespace appKryo = new KryoNamespace.Builder().build();
+
+    /**
+     * Creates a new nicicra ct instruction.
+     */
+    public NiciraCt() {
+        flags = 0;
+        zoneSrc = 0L;
+        zone = 0;
+        alg = 0;
+        recircTable = 0xFF;
+        nestedActions = new ArrayList<>();
+    }
+
+    /**
+     * Creates a new nicicra ct instruction.
+     * @param flags  zero or commit(0x01)
+     * @param zoneSrc If 'zone_src' is nonzero, this specifies that the zone should be
+     *                sourced from a field zone_src[ofs:ofs+nbits].
+     * @param zone this is the union of zone_imm and zone_ofs_nbits
+     *             If 'zone_src' is zero, then the value of 'zone_imm'
+     *             will be used as the connection tracking zone
+     * @param recircTable  Recirculate to a specific table or 0xff for no recirculation
+     * @param alg  Well-known port number for the protocol, 0 indicates no ALG is required
+     * @param actions a sequence of zero or more OpenFlow actions
+     */
+    public NiciraCt(int flags, long zoneSrc, int zone, short recircTable, int alg, List<ExtensionTreatment> actions) {
+        this.flags = flags;
+        this.zoneSrc = zoneSrc;
+        this.zone = zone;
+        this.recircTable = recircTable;
+        this.alg = alg;
+        this.nestedActions = actions;
+    }
+
+    @Override
+    public ExtensionTreatmentType type() {
+        return ExtensionTreatmentType.ExtensionTreatmentTypes.NICIRA_CT.type();
+    }
+
+    /**
+     * Get Nicira Conntrack flags.
+     * @return flags
+     */
+    public int niciraCtFlags() {
+        return flags;
+    }
+
+    /**
+     * Get Nicira Conntrack zone.
+     * @return zone
+     */
+    public int niciraCtZone() {
+        return zone;
+    }
+
+    /**
+     * Get Nicira Conntrack zone src.
+     * @return zoneSrc
+     */
+    public long niciraCtZoneSrc() {
+        return zoneSrc;
+    }
+
+    /**
+     * Get Nicira Conntrack alg.
+     * @return alg
+     */
+    public int niciraCtAlg() {
+        return alg;
+    }
+
+    /**
+     * Get Nicira Conntrack Recirc table.
+     * @return recirc table
+     */
+    public short niciraCtRecircTable() {
+        return recircTable;
+    }
+
+    /**
+     * Get Nicira Conntrack Recirc table.
+     * @return list extension treatment
+     */
+    public List<ExtensionTreatment> niciraCtNestActions() {
+        return nestedActions;
+    }
+
+    @Override
+    public void deserialize(byte[] data) {
+        Map<String, Object> values = appKryo.deserialize(data);
+        flags = (int) values.get("flags");
+        zoneSrc = (long) values.get("zoneSrc");
+        zone = (int) values.get("zone");
+        recircTable = (short) values.get("recircTable");
+        alg = (int) values.get("alg");
+        nestedActions = (List) values.get("nestedActions");
+    }
+
+    @Override
+    public byte[] serialize() {
+        Map<String, Object> values = Maps.newHashMap();
+        values.put("flags", flags);
+        values.put("zoneSrc", zoneSrc);
+        values.put("zone", zone);
+        values.put("recircTable", recircTable);
+        values.put("alg", alg);
+        values.put("nestedActions", nestedActions);
+        return appKryo.serialize(values);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(type(), flags, zone, zoneSrc, alg, recircTable, nestedActions);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof NiciraCt) {
+            NiciraCt that = (NiciraCt) obj;
+            return Objects.equals(flags, that.flags) &&
+                    Objects.equals(zone, that.zone) &&
+                    Objects.equals(zoneSrc, that.zoneSrc) &&
+                    Objects.equals(alg, that.alg) &&
+                    Objects.equals(recircTable, that.recircTable) &&
+                    Objects.equals(nestedActions, that.nestedActions) &&
+                    Objects.equals(this.type(), that.type());
+        }
+        return false;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("flags", flags)
+                .add("zoneSrc", zoneSrc)
+                .add("zone", zone)
+                .add("recircTable", recircTable)
+                .add("alg", alg)
+                .add("nestedActions", nestedActions)
+                .toString();
+    }
+}
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