Packet throttle support

Change-Id: I6f2da5ed25f794561349013bfcbf9afa85d5e190
diff --git a/core/api/src/main/java/org/onosproject/net/packet/packetfilter/Icmp6PacketClassifier.java b/core/api/src/main/java/org/onosproject/net/packet/packetfilter/Icmp6PacketClassifier.java
new file mode 100644
index 0000000..7dfa806
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/packet/packetfilter/Icmp6PacketClassifier.java
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2019-present Open Networking Foundation
+ *
+ * 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.net.packet.packetfilter;
+
+import org.onlab.packet.Ethernet;
+import org.onlab.packet.ICMP6;
+import org.onlab.packet.IPv6;
+import org.onosproject.net.packet.PacketContext;
+import org.onosproject.net.packet.PacketInClassifier;
+import org.slf4j.Logger;
+import static org.slf4j.LoggerFactory.getLogger;
+
+public class Icmp6PacketClassifier implements PacketInClassifier {
+    private final Logger log = getLogger(getClass());
+    @Override
+    public boolean match(PacketContext packet) {
+        Ethernet eth = packet.inPacket().parsed();
+
+        if (eth.getEtherType() == Ethernet.TYPE_IPV6) {
+            IPv6 ipv6Packet = (IPv6) eth.getPayload();
+
+            if (ipv6Packet.getNextHeader() == IPv6.PROTOCOL_ICMP6) {
+                ICMP6 icmp6Packet = (ICMP6) ipv6Packet.getPayload();
+                if (icmp6Packet.getIcmpType() == ICMP6.ECHO_REQUEST) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+}