# NetworkingDriverKit Constants ## Topics ### Enumerations [`IOUserNetworkPacketBufferPoolFlags`](/documentation/NetworkingDriverKit/IOUserNetworkPacketBufferPoolFlags) ### Blocking behavior [`kIOUserNetworkBlocking`](/documentation/NetworkingDriverKit/kIOUserNetworkBlocking) [`kIOUserNetworkNonBlocking`](/documentation/NetworkingDriverKit/kIOUserNetworkNonBlocking) ### Network packet service classes [`kIOUserNetworkPacketServiceClassAV`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketServiceClassAV) [`kIOUserNetworkPacketServiceClassBE`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketServiceClassBE) [`kIOUserNetworkPacketServiceClassBK`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketServiceClassBK) [`kIOUserNetworkPacketServiceClassBKSYS`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketServiceClassBKSYS) [`kIOUserNetworkPacketServiceClassCTL`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketServiceClassCTL) [`kIOUserNetworkPacketServiceClassNone`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketServiceClassNone) [`kIOUserNetworkPacketServiceClassOAM`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketServiceClassOAM) [`kIOUserNetworkPacketServiceClassRD`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketServiceClassRD) [`kIOUserNetworkPacketServiceClassRV`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketServiceClassRV) [`kIOUserNetworkPacketServiceClassVI`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketServiceClassVI) [`kIOUserNetworkPacketServiceClassVO`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketServiceClassVO) ### Network packet polling events [`kIOUserNetworkPacketPollerEventPollStart`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketPollerEventPollStart) [`kIOUserNetworkPacketPollerEventPollStop`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketPollerEventPollStop) [`kIOUserNetworkPacketPollerEventTypeMask`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketPollerEventTypeMask) ### Network features [`kIOUserNetworkFeatureFlagNicProxy`](/documentation/NetworkingDriverKit/kIOUserNetworkFeatureFlagNicProxy) [`kIOUserNetworkFeatureFlagSoftwareVlan`](/documentation/NetworkingDriverKit/kIOUserNetworkFeatureFlagSoftwareVlan) [`kIOUserNetworkFeatureFlagWOMP`](/documentation/NetworkingDriverKit/kIOUserNetworkFeatureFlagWOMP) [`kIOUserNetworkFeatureHWTimeStamp`](/documentation/NetworkingDriverKit/kIOUserNetworkFeatureHWTimeStamp) [`kIOUserNetworkFeatureSWTimeStamp`](/documentation/NetworkingDriverKit/kIOUserNetworkFeatureSWTimeStamp) ### Local port detection [`kIOUserNetworkGetLocalPortsActiveOnly`](/documentation/NetworkingDriverKit/kIOUserNetworkGetLocalPortsActiveOnly) [`kIOUserNetworkGetLocalPortsAnyTCPStateOK`](/documentation/NetworkingDriverKit/kIOUserNetworkGetLocalPortsAnyTCPStateOK) [`kIOUserNetworkGetLocalPortsExtendedBackgroundIdleOnly`](/documentation/NetworkingDriverKit/kIOUserNetworkGetLocalPortsExtendedBackgroundIdleOnly) [`kIOUserNetworkGetLocalPortsNoWakeupOk`](/documentation/NetworkingDriverKit/kIOUserNetworkGetLocalPortsNoWakeupOk) [`kIOUserNetworkGetLocalPortsRecvAnyInterfaceOnly`](/documentation/NetworkingDriverKit/kIOUserNetworkGetLocalPortsRecvAnyInterfaceOnly) [`kIOUserNetworkGetLocalPortsTCPOnly`](/documentation/NetworkingDriverKit/kIOUserNetworkGetLocalPortsTCPOnly) [`kIOUserNetworkGetLocalPortsUDPOnly`](/documentation/NetworkingDriverKit/kIOUserNetworkGetLocalPortsUDPOnly) [`kIOUserNetworkGetLocalPortsWildCardOk`](/documentation/NetworkingDriverKit/kIOUserNetworkGetLocalPortsWildCardOk) ### Packet types [`kIOUserNetworkPacketTSOIPV4`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketTSOIPV4) [`kIOUserNetworkPacketTSOIPV6`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketTSOIPV6) [`kIOUserNetworkPacketLROIPV4`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketLROIPV4) [`kIOUserNetworkPacketLROIPV6`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketLROIPV6) ### Packet checksums [`kIOUserNetworkPacketRxCsumDataValid`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketRxCsumDataValid) [`kIOUserNetworkPacketRxCsumIPChecked`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketRxCsumIPChecked) [`kIOUserNetworkPacketRxCsumIPValid`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketRxCsumIPValid) [`kIOUserNetworkPacketRxCsumPseudoHdr`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketRxCsumPseudoHdr) [`kIOUserNetworkPacketTxCsumIPHdr`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketTxCsumIPHdr) [`kIOUserNetworkPacketTxCsumPartial`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketTxCsumPartial) [`kIOUserNetworkPacketTxCsumTCPIPV4`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketTxCsumTCPIPV4) [`kIOUserNetworkPacketTxCsumTCPIPV6`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketTxCsumTCPIPV6) [`kIOUserNetworkPacketTxCsumUDPIPV4`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketTxCsumUDPIPV4) [`kIOUserNetworkPacketTxCsumUDPIPV6`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketTxCsumUDPIPV6) [`kIOUserNetworkPacketTxCsumZeroInvert`](/documentation/NetworkingDriverKit/kIOUserNetworkPacketTxCsumZeroInvert) ### Proxy keepalive [`nicproxy_keepalive_ethertype_ip`](/documentation/NetworkingDriverKit/nicproxy_keepalive_ethertype_ip) [`nicproxy_keepalive_tcp`](/documentation/NetworkingDriverKit/nicproxy_keepalive_tcp) ### Hardware assist features [`kIOUserNetworkHWAssistHWTimeStamp`](/documentation/NetworkingDriverKit/kIOUserNetworkHWAssistHWTimeStamp) [`kIOUserNetworkHWAssistLRO`](/documentation/NetworkingDriverKit/kIOUserNetworkHWAssistLRO) [`kIOUserNetworkHWAssistNicProxy`](/documentation/NetworkingDriverKit/kIOUserNetworkHWAssistNicProxy) [`kIOUserNetworkHWAssistRxChecksum`](/documentation/NetworkingDriverKit/kIOUserNetworkHWAssistRxChecksum) [`kIOUserNetworkHWAssistSWTimeStamp`](/documentation/NetworkingDriverKit/kIOUserNetworkHWAssistSWTimeStamp) [`kIOUserNetworkHWAssistSoftwareVlan`](/documentation/NetworkingDriverKit/kIOUserNetworkHWAssistSoftwareVlan) [`kIOUserNetworkHWAssistTSO4`](/documentation/NetworkingDriverKit/kIOUserNetworkHWAssistTSO4) [`kIOUserNetworkHWAssistTSO6`](/documentation/NetworkingDriverKit/kIOUserNetworkHWAssistTSO6) [`kIOUserNetworkHWAssistTxChecksumIPHdr`](/documentation/NetworkingDriverKit/kIOUserNetworkHWAssistTxChecksumIPHdr) [`kIOUserNetworkHWAssistTxChecksumTCP`](/documentation/NetworkingDriverKit/kIOUserNetworkHWAssistTxChecksumTCP) [`kIOUserNetworkHWAssistTxChecksumUDP`](/documentation/NetworkingDriverKit/kIOUserNetworkHWAssistTxChecksumUDP) [`kIOUserNetworkHWAssistWOMP`](/documentation/NetworkingDriverKit/kIOUserNetworkHWAssistWOMP) ### Enumeration cases [`IFNET_FAMILY_ANY`](/documentation/NetworkingDriverKit/IFNET_FAMILY_ANY) [`IFNET_FAMILY_ETHERNET`](/documentation/NetworkingDriverKit/IFNET_FAMILY_ETHERNET) [`IFNET_SUBFAMILY_ANY`](/documentation/NetworkingDriverKit/IFNET_SUBFAMILY_ANY) [`IONetworkPacketTypeNetwork`](/documentation/NetworkingDriverKit/IONetworkPacketTypeNetwork) [`rr_length_mask`](/documentation/NetworkingDriverKit/rr_length_mask) [`rr_ptr_mask`](/documentation/NetworkingDriverKit/rr_ptr_mask) ### Macros [`IOUSERNETWORKKEEPALIVEOFFLOADFRAME_AIRPLAY`](/documentation/NetworkingDriverKit/IOUSERNETWORKKEEPALIVEOFFLOADFRAME_AIRPLAY) [`IOUSERNETWORKKEEPALIVEOFFLOADFRAME_IPSEC`](/documentation/NetworkingDriverKit/IOUSERNETWORKKEEPALIVEOFFLOADFRAME_IPSEC) [`IOUSERNETWORKKEEPALIVEOFFLOADFRAME_TCP`](/documentation/NetworkingDriverKit/IOUSERNETWORKKEEPALIVEOFFLOADFRAME_TCP) [`IOUSERNETWORKKEEPALIVEOFFLOAD_DATA_SIZE`](/documentation/NetworkingDriverKit/IOUSERNETWORKKEEPALIVEOFFLOAD_DATA_SIZE) [`IOUSERNETWORKKEEPALIVEOFFLOAD_ETHERTYPE_IPV4`](/documentation/NetworkingDriverKit/IOUSERNETWORKKEEPALIVEOFFLOAD_ETHERTYPE_IPV4) [`IOUSERNETWORKKEEPALIVEOFFLOAD_ETHERTYPE_IPV6`](/documentation/NetworkingDriverKit/IOUSERNETWORKKEEPALIVEOFFLOAD_ETHERTYPE_IPV6) [`IOUSERNETWORKKEEPALIVEOFFLOAD_FLAG_NOWAKEFROMSLEEP`](/documentation/NetworkingDriverKit/IOUSERNETWORKKEEPALIVEOFFLOAD_FLAG_NOWAKEFROMSLEEP) [`IOUSERNETWORKKEEPALIVEOFFLOAD_MAX_ADDR_SIZE`](/documentation/NetworkingDriverKit/IOUSERNETWORKKEEPALIVEOFFLOAD_MAX_ADDR_SIZE) [`IOUSERNETWORKLINKLAYERREACHABILITYINFO_ADDRLEN`](/documentation/NetworkingDriverKit/IOUSERNETWORKLINKLAYERREACHABILITYINFO_ADDRLEN) [`IOUSERNETWORKPRIVATEDEFINED`](/documentation/NetworkingDriverKit/IOUSERNETWORKPRIVATEDEFINED) [`IP_PORTRANGE_BITFIELD_LEN`](/documentation/NetworkingDriverKit/IP_PORTRANGE_BITFIELD_LEN) [`NDK_20`](/documentation/NetworkingDriverKit/NDK_20) [`NDK_21`](/documentation/NetworkingDriverKit/NDK_21) [`NDK_22`](/documentation/NetworkingDriverKit/NDK_22) [`NDK_23`](/documentation/NetworkingDriverKit/NDK_23) [`NDK_24`](/documentation/NetworkingDriverKit/NDK_24) [`NIC_PROXY_FLAGS_WOMP`](/documentation/NetworkingDriverKit/NIC_PROXY_FLAGS_WOMP) [`NIC_PROXY_FLAGS_WONLINK`](/documentation/NetworkingDriverKit/NIC_PROXY_FLAGS_WONLINK) --- Copyright © 2026 Apple Inc. 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