DEFINE_FIELD_M(OF_ARP_SPA, 0, ETH_TYPE_ARP, 0, false)
DEFINE_FIELD_M(OF_ARP_TPA, 0, ETH_TYPE_ARP, 0, false)
DEFINE_FIELD_M(NX_TUN_ID, 0, 0, 0, true)
+DEFINE_FIELD (NX_ARP_SHA, FWW_ARP_SHA, ETH_TYPE_ARP, 0, false)
+DEFINE_FIELD (NX_ARP_THA, FWW_ARP_THA, ETH_TYPE_ARP, 0, false)
DEFINE_FIELD_M(NX_REG0, 0, 0, 0, true)
#if FLOW_N_REGS >= 2