diff --git a/tools/test/p4src/tor/middleblock.p4 b/tools/test/p4src/tor/middleblock.p4
new file mode 100644
index 0000000..93ab2a5
--- /dev/null
+++ b/tools/test/p4src/tor/middleblock.p4
@@ -0,0 +1,39 @@
+// Copyright (c) 2017, Google Inc.
+//
+// P4_16 specification for a middleblock switch in a Jupiter superblock.
+// Status: WORK IN PROGRESS
+// Note: This code has not been tested and is expected to contain bugs.
+
+#include "parser.p4"
+#include "class_id.p4"
+#include "l3_fwd.p4"
+#include "packetio.p4"
+#include "punt.p4"
+#include "vrf.p4"
+#include "ipv4_checksum.p4"
+
+
+control ingress_middleblock(inout parsed_packet_t hdr,
+                            inout local_metadata_t local_metadata,
+                            inout standard_metadata_t standard_metadata) {
+  apply {
+    if (hdr.packet_out.isValid()) {
+      packetio_ingress.apply(hdr, local_metadata, standard_metadata);
+    }
+    vrf.apply(hdr, local_metadata, standard_metadata);
+    class_id.apply(hdr, local_metadata, standard_metadata);
+    l3_fwd.apply(hdr, local_metadata, standard_metadata);
+    punt.apply(hdr, local_metadata, standard_metadata);
+  }
+} // end ingress_middleblock
+
+control egress_middleblock(inout parsed_packet_t hdr,
+                     inout local_metadata_t local_metadata,
+                     inout standard_metadata_t standard_metadata) {
+  apply {
+    packetio_egress.apply(hdr, local_metadata, standard_metadata);
+  }
+} // end egress_middleblock
+
+V1Switch(pkt_parser(), verify_checksum(), ingress_middleblock(),
+         egress_middleblock(), compute_checksum(), pkt_deparser()) main;