--- openflow-2012-03-12-2.h	2015-07-23 09:54:17.036479357 -0700
+++ openflow-2012-03-06-2.h	2015-07-23 09:54:17.040479358 -0700
@@ -1227,6 +1227,7 @@
     uint16_t total_len;     /* Full length of frame. */
     uint8_t reason;         /* Reason packet is being sent (one of OFPR_*) */
     uint8_t table_id;       /* ID of the table that was looked up */
+    uint64_t cookie;        /* Cookie of the rule that was looked up. */
     struct ofp_match match; /* Packet metadata. Variable size. */
     /* Followed by:
      *   - Exactly 2 all-zero padding bytes, then