diff --git a/wireshark_gen/templates/openflow.lua b/wireshark_gen/templates/openflow.lua
index 7f202d2..5ea4186 100644
--- a/wireshark_gen/templates/openflow.lua
+++ b/wireshark_gen/templates/openflow.lua
@@ -1 +1,66 @@
 -- TODO copyright (GPL)
+
+p_of = Proto ("of", "OpenFlow")
+
+local ofp_type = {
+    [0] = "HELLO",
+    [1] = "ECHO_REQUEST",
+    [2] = "ECHO_REPLY",
+    [3] = "ERROR",
+}
+
+local f_version = ProtoField.uint8("of.version", "Version", base.HEX)
+local f_type = ProtoField.uint8("of.type", "Type", base.HEX, ofp_type)
+local f_length = ProtoField.uint16("of.length", "Length", base.HEX)
+local f_xid = ProtoField.uint32("of.xid", "XID", base.HEX)
+
+p_of.fields = {
+    f_version,
+    f_type,
+    f_length,
+    f_xid,
+}
+
+function dissect_one(buf, pkt, root)
+    -- create subtree for of
+    local subtree = root:add(p_of, buf(0))
+    -- add protocol fields to subtree
+    subtree:add(f_version, buf(0,1))
+    subtree:add(f_type, buf(1,1))
+    subtree:add(f_length, buf(2,2))
+    subtree:add(f_xid, buf(4,4))
+
+    local type_val = buf(1,1):uint()
+end
+
+-- of dissector function
+function p_of.dissector (buf, pkt, root)
+    pkt.cols.protocol = p_of.name
+
+    local offset = 0
+    repeat
+        if buf:len() - offset >= 4 then
+            msg_len = buf(offset+2,2):uint()
+            if offset + msg_len > buf:len() then
+                -- we don't have all the data we need yet
+                pkt.desegment_len = offset + msg_len - buf:len()
+                return
+            end
+
+            dissect_one(buf(offset, msg_len), pkt, root)
+            offset = offset + msg_len
+        else
+            -- we don't have all of length field yet
+            pkt.desegment_len = DESEGMENT_ONE_MORE_SEGMENT
+            return
+        end
+    until offset >= buf:len()
+end
+
+-- Initialization routine
+function p_of.init()
+end
+
+-- register a chained dissector for port 8002
+local tcp_dissector_table = DissectorTable.get("tcp.port")
+tcp_dissector_table:add(6633, p_of)