Sketched out packet service and related abstractions.
diff --git a/core/api/src/main/java/org/onlab/onos/net/packet/PacketProvider.java b/core/api/src/main/java/org/onlab/onos/net/packet/PacketProvider.java
new file mode 100644
index 0000000..14597ee
--- /dev/null
+++ b/core/api/src/main/java/org/onlab/onos/net/packet/PacketProvider.java
@@ -0,0 +1,15 @@
+package org.onlab.onos.net.packet;
+
+/**
+ * Abstraction of a packet provider capable of emitting packets.
+ */
+public interface PacketProvider {
+
+ /**
+ * Emits the specified outbound packet onto the network.
+ *
+ * @param packet outbound packet
+ */
+ void emit(OutboundPacket packet);
+
+}