+/* Why is this packet being sent to the controller? */
+enum ofp_packet_in_reason {
+ OFPR_NO_MATCH, /* No matching flow. */
+ OFPR_ACTION, /* Action explicitly output to controller. */
+ OFPR_INVALID_TTL /* Packet has invalid TTL. */,
+ OFPR_N_REASONS
+};
+
+/* Why was this flow removed? */
+enum ofp_flow_removed_reason {
+ OFPRR_IDLE_TIMEOUT, /* Flow idle time exceeded idle_timeout. */
+ OFPRR_HARD_TIMEOUT, /* Time exceeded hard_timeout. */
+ OFPRR_DELETE /* Evicted by a DELETE flow mod. */
+};
+