/* L4. */
MFF_TCP_SRC, /* be16 (used for IPv4 or IPv6) */
MFF_TCP_DST, /* be16 (used for IPv4 or IPv6) */
+ MFF_TCP_FLAGS, /* be16, 12 bits (4 MSB zeroed,
+ * used for IPv4 or IPv6) */
MFF_UDP_SRC, /* be16 (used for IPv4 or IPv6) */
MFF_UDP_DST, /* be16 (used for IPv4 or IPv6) */