Quelle  dropreason-core.h   Sprache: C

/* SPDX-License-Identifier: GPL-2.0-or-later */

#ifndef _LINUX_DROPREASON_CORE_H
#define _LINUX_DROPREASON_CORE_H

#define DEFINE_DROP_REASON(FN, FNe) \
 FN(NOT_SPECIFIED)  \
 FN(NO_SOCKET)   \
 FN(SOCKET_CLOSE)  \
 FN(SOCKET_FILTER)  \
 FN(SOCKET_RCVBUFF)  \
 FN(UNIX_DISCONNECT)  \
 FN(UNIX_SKIP_OOB)  \
 FN(PKT_TOO_SMALL)  \
 FN(TCP_CSUM)   \
 FN(UDP_CSUM)   \
 FN(NETFILTER_DROP)  \
 FN(OTHERHOST)   \
 FN(IP_CSUM)   \
 FN(IP_INHDR)   \
 FN(IP_RPFILTER)   \
 FN(UNICAST_IN_L2_MULTICAST) \
 FN(XFRM_POLICY)   \
 FN(IP_NOPROTO)   \
 FN(PROTO_MEM)   \
 FN(TCP_AUTH_HDR)  \
 FN(TCP_MD5NOTFOUND)  \
 FN(TCP_MD5UNEXPECTED)  \
 FN(TCP_MD5FAILURE)  \
 FN(TCP_AONOTFOUND)  \
 FN(TCP_AOUNEXPECTED)  \
 FN(TCP_AOKEYNOTFOUND)  \
 FN(TCP_AOFAILURE)  \
 FN(SOCKET_BACKLOG)  \
 FN(TCP_FLAGS)   \
 FN(TCP_ABORT_ON_DATA)  \
 FN(TCP_ZEROWINDOW)  \
 FN(TCP_OLD_DATA)  \
 FN(TCP_OVERWINDOW)  \
 FN(TCP_OFOMERGE)  \
 FN(TCP_RFC7323_PAWS)  \
 FN(TCP_RFC7323_PAWS_ACK) \
 FN(TCP_RFC7323_TW_PAWS)  \
 FN(TCP_RFC7323_TSECR)  \
 FN(TCP_LISTEN_OVERFLOW)  \
 FN(TCP_OLD_SEQUENCE)  \
 FN(TCP_INVALID_SEQUENCE) \
 FN(TCP_INVALID_END_SEQUENCE) \
 FN(TCP_INVALID_ACK_SEQUENCE) \
 FN(TCP_RESET)   \
 FN(TCP_INVALID_SYN)  \
 FN(TCP_CLOSE)   \
 FN(TCP_FASTOPEN)  \
 FN(TCP_OLD_ACK)   \
 FN(TCP_TOO_OLD_ACK)  \
 FN(TCP_ACK_UNSENT_DATA)  \
 FN(TCP_OFO_QUEUE_PRUNE)  \
 FN(TCP_OFO_DROP)  \
 FN(IP_OUTNOROUTES)  \
 FN(BPF_CGROUP_EGRESS)  \
 FN(IPV6DISABLED)  \
 FN(NEIGH_CREATEFAIL)  \
 FN(NEIGH_FAILED)  \
 FN(NEIGH_QUEUEFULL)  \
 FN(NEIGH_DEAD)   \
 FN(NEIGH_HH_FILLFAIL)  \
 FN(TC_EGRESS)   \
 FN(SECURITY_HOOK)  \
 FN(QDISC_DROP)   \
 FN(QDISC_OVERLIMIT)  \
 FN(QDISC_CONGESTED)  \
 FN(CAKE_FLOOD)   \
 FN(FQ_BAND_LIMIT)  \
 FN(FQ_HORIZON_LIMIT)  \
 FN(FQ_FLOW_LIMIT)  \
 FN(CPU_BACKLOG)   \
 FN(XDP)    \
 FN(TC_INGRESS)   \
 FN(UNHANDLED_PROTO)  \
 FN(SKB_CSUM)   \
 FN(SKB_GSO_SEG)   \
 FN(SKB_UCOPY_FAULT)  \
 FN(DEV_HDR)   \
 FN(DEV_READY)   \
 FN(FULL_RING)   \
 FN(NOMEM)   \
 FN(HDR_TRUNC)   \
 FN(TAP_FILTER)   \
 FN(TAP_TXFILTER)  \
 FN(ICMP_CSUM)   \
 FN(INVALID_PROTO)  \
 FN(IP_INADDRERRORS)  \
 FN(IP_INNOROUTES)  \
 FN(IP_LOCAL_SOURCE)  \
 FN(IP_INVALID_SOURCE)  \
 FN(IP_LOCALNET)   \
 FN(IP_INVALID_DEST)  \
 FN(PKT_TOO_BIG)   \
 FN(DUP_FRAG)   \
 FN(FRAG_REASM_TIMEOUT)  \
 FN(FRAG_TOO_FAR)  \
 FN(TCP_MINTTL)   \
 FN(IPV6_BAD_EXTHDR)  \
 FN(IPV6_NDISC_FRAG)  \
 FN(IPV6_NDISC_HOP_LIMIT) \
 FN(IPV6_NDISC_BAD_CODE)  \
 FN(IPV6_NDISC_BAD_OPTIONS) \
 FN(IPV6_NDISC_NS_OTHERHOST) \
 FN(QUEUE_PURGE)   \
 FN(TC_COOKIE_ERROR)  \
 FN(PACKET_SOCK_ERROR)  \
 FN(TC_CHAIN_NOTFOUND)  \
 FN(TC_RECLASSIFY_LOOP)  \
 FN(VXLAN_INVALID_HDR)  \
 FN(VXLAN_VNI_NOT_FOUND)  \
 FN(MAC_INVALID_SOURCE)  \
 FN(VXLAN_ENTRY_EXISTS)  \
 FN(NO_TX_TARGET)  \
 FN(IP_TUNNEL_ECN)  \
 FN(TUNNEL_TXINFO)  \
 FN(LOCAL_MAC)   \
 FN(ARP_PVLAN_DISABLE)  \
 FN(MAC_IEEE_MAC_CONTROL) \
 FN(BRIDGE_INGRESS_STP_STATE) \
 FN(CAN_RX_INVALID_FRAME) \
 FN(CANFD_RX_INVALID_FRAME) \
 FN(CANXL_RX_INVALID_FRAME) \
 FN(PFMEMALLOC) \
 FN(DUALPI2_STEP_DROP)  \
 FNe(MAX)

/**
 * enum skb_drop_reason - the reasons of skb drops
 *
 * The reason of skb drop, which is used in kfree_skb_reason().
 */
enum skb_drop_reason {
 /**
 * @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case)
 */
 SKB_NOT_DROPPED_YET = 0,
 /** @SKB_CONSUMED: packet has been consumed */
 SKB_CONSUMED,
 /** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */
 SKB_DROP_REASON_NOT_SPECIFIED,
 /**
 * @SKB_DROP_REASON_NO_SOCKET: no valid socket that can be used.
 * Reason could be one of three cases:
 * 1) no established/listening socket found during lookup process
 * 2) no valid request socket during 3WHS process
 * 3) no valid child socket during 3WHS process
 */
 SKB_DROP_REASON_NO_SOCKET,
 /** @SKB_DROP_REASON_SOCKET_CLOSE: socket is close()d */
 SKB_DROP_REASON_SOCKET_CLOSE,
 /** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */
 SKB_DROP_REASON_SOCKET_FILTER,
 /** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */
 SKB_DROP_REASON_SOCKET_RCVBUFF,
 /**
 * @SKB_DROP_REASON_UNIX_DISCONNECT: recv queue is purged when SOCK_DGRAM
 * or SOCK_SEQPACKET socket re-connect()s to another socket or notices
 * during send() that the peer has been close()d.
 */
 SKB_DROP_REASON_UNIX_DISCONNECT,
 /**
 * @SKB_DROP_REASON_UNIX_SKIP_OOB: Out-Of-Band data is skipped by
 * recv() without MSG_OOB so dropped.
 */
 SKB_DROP_REASON_UNIX_SKIP_OOB,
 /** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */
 SKB_DROP_REASON_PKT_TOO_SMALL,
 /** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */
 SKB_DROP_REASON_TCP_CSUM,
 /** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */
 SKB_DROP_REASON_UDP_CSUM,
 /** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */
 SKB_DROP_REASON_NETFILTER_DROP,
 /**
 * @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host
 * (interface is in promisc mode)
 */
 SKB_DROP_REASON_OTHERHOST,
 /** @SKB_DROP_REASON_IP_CSUM: IP checksum error */
 SKB_DROP_REASON_IP_CSUM,
 /**
 * @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see
 * IPSTATS_MIB_INHDRERRORS)
 */
 SKB_DROP_REASON_IP_INHDR,
 /**
 * @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the
 * document for rp_filter in ip-sysctl.rst for more information
 */
 SKB_DROP_REASON_IP_RPFILTER,
 /**
 * @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is
 * multicast, but L3 is unicast.
 */
 SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST,
 /** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */
 SKB_DROP_REASON_XFRM_POLICY,
 /** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */
 SKB_DROP_REASON_IP_NOPROTO,
 /**
 * @SKB_DROP_REASON_PROTO_MEM: proto memory limitation, such as
 * udp packet drop out of udp_memory_allocated.
 */
 SKB_DROP_REASON_PROTO_MEM,
 /**
 * @SKB_DROP_REASON_TCP_AUTH_HDR: TCP-MD5 or TCP-AO hashes are met
 * twice or set incorrectly.
 */
 SKB_DROP_REASON_TCP_AUTH_HDR,
 /**
 * @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected,
 * corresponding to LINUX_MIB_TCPMD5NOTFOUND
 */
 SKB_DROP_REASON_TCP_MD5NOTFOUND,
 /**
 * @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting
 * one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED
 */
 SKB_DROP_REASON_TCP_MD5UNEXPECTED,
 /**
 * @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding
 * to LINUX_MIB_TCPMD5FAILURE
 */
 SKB_DROP_REASON_TCP_MD5FAILURE,
 /**
 * @SKB_DROP_REASON_TCP_AONOTFOUND: no TCP-AO hash and one was expected,
 * corresponding to LINUX_MIB_TCPAOREQUIRED
 */
 SKB_DROP_REASON_TCP_AONOTFOUND,
 /**
 * @SKB_DROP_REASON_TCP_AOUNEXPECTED: TCP-AO hash is present and it
 * was not expected, corresponding to LINUX_MIB_TCPAOKEYNOTFOUND
 */
 SKB_DROP_REASON_TCP_AOUNEXPECTED,
 /**
 * @SKB_DROP_REASON_TCP_AOKEYNOTFOUND: TCP-AO key is unknown,
 * corresponding to LINUX_MIB_TCPAOKEYNOTFOUND
 */
 SKB_DROP_REASON_TCP_AOKEYNOTFOUND,
 /**
 * @SKB_DROP_REASON_TCP_AOFAILURE: TCP-AO hash is wrong,
 * corresponding to LINUX_MIB_TCPAOBAD
 */
 SKB_DROP_REASON_TCP_AOFAILURE,
 /**
 * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog (
 * see LINUX_MIB_TCPBACKLOGDROP)
 */
 SKB_DROP_REASON_SOCKET_BACKLOG,
 /** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */
 SKB_DROP_REASON_TCP_FLAGS,
 /**
 * @SKB_DROP_REASON_TCP_ABORT_ON_DATA: abort on data, corresponding to
 * LINUX_MIB_TCPABORTONDATA
 */
 SKB_DROP_REASON_TCP_ABORT_ON_DATA,
 /**
 * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero,
 * see LINUX_MIB_TCPZEROWINDOWDROP
 */
 SKB_DROP_REASON_TCP_ZEROWINDOW,
 /**
 * @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data received is already
 * received before (spurious retrans may happened), see
 * LINUX_MIB_DELAYEDACKLOST
 */
 SKB_DROP_REASON_TCP_OLD_DATA,
 /**
 * @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window,
 * the seq of the first byte exceed the right edges of receive
 * window
 */
 SKB_DROP_REASON_TCP_OVERWINDOW,
 /**
 * @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo
 * queue, corresponding to LINUX_MIB_TCPOFOMERGE
 */
 SKB_DROP_REASON_TCP_OFOMERGE,
 /**
 * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to
 * LINUX_MIB_PAWSESTABREJECTED, LINUX_MIB_PAWSACTIVEREJECTED
 */
 SKB_DROP_REASON_TCP_RFC7323_PAWS,
 /**
 * @SKB_DROP_REASON_TCP_RFC7323_PAWS_ACK: PAWS check, old ACK packet.
 * Corresponds to LINUX_MIB_PAWS_OLD_ACK.
 */
 SKB_DROP_REASON_TCP_RFC7323_PAWS_ACK,
 /**
 * @SKB_DROP_REASON_TCP_RFC7323_TW_PAWS: PAWS check, socket is in
 * TIME_WAIT state.
 * Corresponds to LINUX_MIB_PAWS_TW_REJECTED.
 */
 SKB_DROP_REASON_TCP_RFC7323_TW_PAWS,
 /**
 * @SKB_DROP_REASON_TCP_RFC7323_TSECR: PAWS check, invalid TSEcr.
 * Corresponds to LINUX_MIB_TSECRREJECTED.
 */
 SKB_DROP_REASON_TCP_RFC7323_TSECR,
 /** @SKB_DROP_REASON_TCP_LISTEN_OVERFLOW: listener queue full. */
 SKB_DROP_REASON_TCP_LISTEN_OVERFLOW,
 /** @SKB_DROP_REASON_TCP_OLD_SEQUENCE: Old SEQ field (duplicate packet) */
 SKB_DROP_REASON_TCP_OLD_SEQUENCE,
 /** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field. */
 SKB_DROP_REASON_TCP_INVALID_SEQUENCE,
 /**
 * @SKB_DROP_REASON_TCP_INVALID_END_SEQUENCE:
 * Not acceptable END_SEQ field.
 * Corresponds to LINUX_MIB_BEYOND_WINDOW.
 */
 SKB_DROP_REASON_TCP_INVALID_END_SEQUENCE,
 /**
 * @SKB_DROP_REASON_TCP_INVALID_ACK_SEQUENCE: Not acceptable ACK SEQ
 * field because ack sequence is not in the window between snd_una
 * and snd_nxt
 */
 SKB_DROP_REASON_TCP_INVALID_ACK_SEQUENCE,
 /** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */
 SKB_DROP_REASON_TCP_RESET,
 /**
 * @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected
 * SYN flag
 */
 SKB_DROP_REASON_TCP_INVALID_SYN,
 /** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */
 SKB_DROP_REASON_TCP_CLOSE,
 /** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */
 SKB_DROP_REASON_TCP_FASTOPEN,
 /** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */
 SKB_DROP_REASON_TCP_OLD_ACK,
 /** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */
 SKB_DROP_REASON_TCP_TOO_OLD_ACK,
 /**
 * @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't
 * sent yet
 */
 SKB_DROP_REASON_TCP_ACK_UNSENT_DATA,
 /** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */
 SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE,
 /** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */
 SKB_DROP_REASON_TCP_OFO_DROP,
 /** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */
 SKB_DROP_REASON_IP_OUTNOROUTES,
 /**
 * @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB
 * eBPF program
 */
 SKB_DROP_REASON_BPF_CGROUP_EGRESS,
 /** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */
 SKB_DROP_REASON_IPV6DISABLED,
 /** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */
 SKB_DROP_REASON_NEIGH_CREATEFAIL,
 /** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */
 SKB_DROP_REASON_NEIGH_FAILED,
 /** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */
 SKB_DROP_REASON_NEIGH_QUEUEFULL,
 /** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */
 SKB_DROP_REASON_NEIGH_DEAD,
 /** @SKB_DROP_REASON_NEIGH_HH_FILLFAIL: failed to fill the device hard header */
 SKB_DROP_REASON_NEIGH_HH_FILLFAIL,
 /** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */
 SKB_DROP_REASON_TC_EGRESS,
 /** @SKB_DROP_REASON_SECURITY_HOOK: dropped due to security HOOK */
 SKB_DROP_REASON_SECURITY_HOOK,
 /**
 * @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting (
 * failed to enqueue to current qdisc)
 */
 SKB_DROP_REASON_QDISC_DROP,
 /**
 * @SKB_DROP_REASON_QDISC_OVERLIMIT: dropped by qdisc when a qdisc
 * instance exceeds its total buffer size limit.
 */
 SKB_DROP_REASON_QDISC_OVERLIMIT,
 /**
 * @SKB_DROP_REASON_QDISC_CONGESTED: dropped by a qdisc AQM algorithm
 * due to congestion.
 */
 SKB_DROP_REASON_QDISC_CONGESTED,
 /**
 * @SKB_DROP_REASON_CAKE_FLOOD: dropped by the flood protection part of
 * CAKE qdisc AQM algorithm (BLUE).
 */
 SKB_DROP_REASON_CAKE_FLOOD,
 /**
 * @SKB_DROP_REASON_FQ_BAND_LIMIT: dropped by fq qdisc when per band
 * limit is reached.
 */
 SKB_DROP_REASON_FQ_BAND_LIMIT,
 /**
 * @SKB_DROP_REASON_FQ_HORIZON_LIMIT: dropped by fq qdisc when packet
 * timestamp is too far in the future.
 */
 SKB_DROP_REASON_FQ_HORIZON_LIMIT,
 /**
 * @SKB_DROP_REASON_FQ_FLOW_LIMIT: dropped by fq qdisc when a flow
 * exceeds its limits.
 */
 SKB_DROP_REASON_FQ_FLOW_LIMIT,
 /**
 * @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU
 * backlog queue. This can be caused by backlog queue full (see
 * netdev_max_backlog in net.rst) or RPS flow limit
 */
 SKB_DROP_REASON_CPU_BACKLOG,
 /** @SKB_DROP_REASON_XDP: dropped by XDP in input path */
 SKB_DROP_REASON_XDP,
 /** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */
 SKB_DROP_REASON_TC_INGRESS,
 /** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */
 SKB_DROP_REASON_UNHANDLED_PROTO,
 /** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */
 SKB_DROP_REASON_SKB_CSUM,
 /** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */
 SKB_DROP_REASON_SKB_GSO_SEG,
 /**
 * @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space,
 * e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx()
 */
 SKB_DROP_REASON_SKB_UCOPY_FAULT,
 /** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */
 SKB_DROP_REASON_DEV_HDR,
 /**
 * @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to
 * any of its data structure that is not up/ready/initialized,
 * e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq]
 * is not initialized
 */
 SKB_DROP_REASON_DEV_READY,
 /** @SKB_DROP_REASON_FULL_RING: ring buffer is full */
 SKB_DROP_REASON_FULL_RING,
 /** @SKB_DROP_REASON_NOMEM: error due to OOM */
 SKB_DROP_REASON_NOMEM,
 /**
 * @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from
 * networking data, e.g., failed to pull the protocol header from
 * frags via pskb_may_pull()
 */
 SKB_DROP_REASON_HDR_TRUNC,
 /**
 * @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached
 * to tun/tap, e.g., via TUNSETFILTEREBPF
 */
 SKB_DROP_REASON_TAP_FILTER,
 /**
 * @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at
 * tun/tap, e.g., check_filter()
 */
 SKB_DROP_REASON_TAP_TXFILTER,
 /** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */
 SKB_DROP_REASON_ICMP_CSUM,
 /**
 * @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211,
 * such as a broadcasts ICMP_TIMESTAMP
 */
 SKB_DROP_REASON_INVALID_PROTO,
 /**
 * @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to
 * IPSTATS_MIB_INADDRERRORS
 */
 SKB_DROP_REASON_IP_INADDRERRORS,
 /**
 * @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to
 * IPSTATS_MIB_INADDRERRORS
 */
 SKB_DROP_REASON_IP_INNOROUTES,
 /** @SKB_DROP_REASON_IP_LOCAL_SOURCE: the source ip is local */
 SKB_DROP_REASON_IP_LOCAL_SOURCE,
 /**
 * @SKB_DROP_REASON_IP_INVALID_SOURCE: the source ip is invalid:
 * 1) source ip is multicast or limited broadcast
 * 2) source ip is zero and not IGMP
 */
 SKB_DROP_REASON_IP_INVALID_SOURCE,
 /** @SKB_DROP_REASON_IP_LOCALNET: source or dest ip is local net */
 SKB_DROP_REASON_IP_LOCALNET,
 /**
 * @SKB_DROP_REASON_IP_INVALID_DEST: the dest ip is invalid:
 * 1) dest ip is 0
 */
 SKB_DROP_REASON_IP_INVALID_DEST,
 /**
 * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the
 * MTU)
 */
 SKB_DROP_REASON_PKT_TOO_BIG,
 /** @SKB_DROP_REASON_DUP_FRAG: duplicate fragment */
 SKB_DROP_REASON_DUP_FRAG,
 /** @SKB_DROP_REASON_FRAG_REASM_TIMEOUT: fragment reassembly timeout */
 SKB_DROP_REASON_FRAG_REASM_TIMEOUT,
 /**
 * @SKB_DROP_REASON_FRAG_TOO_FAR: ipv4 fragment too far.
 * (/proc/sys/net/ipv4/ipfrag_max_dist)
 */
 SKB_DROP_REASON_FRAG_TOO_FAR,
 /**
 * @SKB_DROP_REASON_TCP_MINTTL: ipv4 ttl or ipv6 hoplimit below
 * the threshold (IP_MINTTL or IPV6_MINHOPCOUNT).
 */
 SKB_DROP_REASON_TCP_MINTTL,
 /** @SKB_DROP_REASON_IPV6_BAD_EXTHDR: Bad IPv6 extension header. */
 SKB_DROP_REASON_IPV6_BAD_EXTHDR,
 /** @SKB_DROP_REASON_IPV6_NDISC_FRAG: invalid frag (suppress_frag_ndisc). */
 SKB_DROP_REASON_IPV6_NDISC_FRAG,
 /** @SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT: invalid hop limit. */
 SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT,
 /** @SKB_DROP_REASON_IPV6_NDISC_BAD_CODE: invalid NDISC icmp6 code. */
 SKB_DROP_REASON_IPV6_NDISC_BAD_CODE,
 /** @SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS: invalid NDISC options. */
 SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS,
 /**
 * @SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST: NEIGHBOUR SOLICITATION
 * for another host.
 */
 SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST,
 /** @SKB_DROP_REASON_QUEUE_PURGE: bulk free. */
 SKB_DROP_REASON_QUEUE_PURGE,
 /**
 * @SKB_DROP_REASON_TC_COOKIE_ERROR: An error occurred whilst
 * processing a tc ext cookie.
 */
 SKB_DROP_REASON_TC_COOKIE_ERROR,
 /**
 * @SKB_DROP_REASON_PACKET_SOCK_ERROR: generic packet socket errors
 * after its filter matches an incoming packet.
 */
 SKB_DROP_REASON_PACKET_SOCK_ERROR,
 /** @SKB_DROP_REASON_TC_CHAIN_NOTFOUND: tc chain lookup failed. */
 SKB_DROP_REASON_TC_CHAIN_NOTFOUND,
 /**
 * @SKB_DROP_REASON_TC_RECLASSIFY_LOOP: tc exceeded max reclassify loop
 * iterations.
 */
 SKB_DROP_REASON_TC_RECLASSIFY_LOOP,
 /**
 * @SKB_DROP_REASON_VXLAN_INVALID_HDR: VXLAN header is invalid. E.g.:
 * 1) reserved fields are not zero
 * 2) "I" flag is not set
 */
 SKB_DROP_REASON_VXLAN_INVALID_HDR,
 /** @SKB_DROP_REASON_VXLAN_VNI_NOT_FOUND: no VXLAN device found for VNI */
 SKB_DROP_REASON_VXLAN_VNI_NOT_FOUND,
 /** @SKB_DROP_REASON_MAC_INVALID_SOURCE: source mac is invalid */
 SKB_DROP_REASON_MAC_INVALID_SOURCE,
 /**
 * @SKB_DROP_REASON_VXLAN_ENTRY_EXISTS: trying to migrate a static
 * entry or an entry pointing to a nexthop.
 */
 SKB_DROP_REASON_VXLAN_ENTRY_EXISTS,
 /** @SKB_DROP_REASON_NO_TX_TARGET: no target found for xmit */
 SKB_DROP_REASON_NO_TX_TARGET,
 /**
 * @SKB_DROP_REASON_IP_TUNNEL_ECN: skb is dropped according to
 * RFC 6040 4.2, see __INET_ECN_decapsulate() for detail.
 */
 SKB_DROP_REASON_IP_TUNNEL_ECN,
 /**
 * @SKB_DROP_REASON_TUNNEL_TXINFO: packet without necessary metadata
 * reached a device which is in "external" mode.
 */
 SKB_DROP_REASON_TUNNEL_TXINFO,
 /**
 * @SKB_DROP_REASON_LOCAL_MAC: the source MAC address is equal to
 * the MAC address of the local netdev.
 */
 SKB_DROP_REASON_LOCAL_MAC,
 /**
 * @SKB_DROP_REASON_ARP_PVLAN_DISABLE: packet which is not IP is
 * forwarded to the in_dev, and the proxy_arp_pvlan is not
 * enabled.
 */
 SKB_DROP_REASON_ARP_PVLAN_DISABLE,
 /**
 * @SKB_DROP_REASON_MAC_IEEE_MAC_CONTROL: the destination MAC address
 * is an IEEE MAC Control address.
 */
 SKB_DROP_REASON_MAC_IEEE_MAC_CONTROL,
 /**
 * @SKB_DROP_REASON_BRIDGE_INGRESS_STP_STATE: the STP state of the
 * ingress bridge port does not allow frames to be forwarded.
 */
 SKB_DROP_REASON_BRIDGE_INGRESS_STP_STATE,
 /**
 * @SKB_DROP_REASON_CAN_RX_INVALID_FRAME: received
 * non conform CAN frame (or device is unable to receive CAN frames)
 */
 SKB_DROP_REASON_CAN_RX_INVALID_FRAME,
 /**
 * @SKB_DROP_REASON_CANFD_RX_INVALID_FRAME: received
 * non conform CAN-FD frame (or device is unable to receive CAN frames)
 */
 SKB_DROP_REASON_CANFD_RX_INVALID_FRAME,
 /**
 * @SKB_DROP_REASON_CANXL_RX_INVALID_FRAME: received
 * non conform CAN-XL frame (or device is unable to receive CAN frames)
 */
 SKB_DROP_REASON_CANXL_RX_INVALID_FRAME,
 /**
 * @SKB_DROP_REASON_PFMEMALLOC: packet allocated from memory reserve
 * reached a path or socket not eligible for use of memory reserves
 */
 SKB_DROP_REASON_PFMEMALLOC,
 /**
 * @SKB_DROP_REASON_DUALPI2_STEP_DROP: dropped by the step drop
 * threshold of DualPI2 qdisc.
 */
 SKB_DROP_REASON_DUALPI2_STEP_DROP,
 /**
 * @SKB_DROP_REASON_MAX: the maximum of core drop reasons, which
 * shouldn't be used as a real 'reason' - only for tracing code gen
 */
 SKB_DROP_REASON_MAX,

 /**
 * @SKB_DROP_REASON_SUBSYS_MASK: subsystem mask in drop reasons,
 * see &enum skb_drop_reason_subsys
 */
 SKB_DROP_REASON_SUBSYS_MASK = 0xffff0000,
};

#define SKB_DROP_REASON_SUBSYS_SHIFT 16

#define SKB_DR_INIT(name, reason)    \
 enum skb_drop_reason name = SKB_DROP_REASON_##reason
#define SKB_DR(name)      \
 SKB_DR_INIT(name, NOT_SPECIFIED)
#define SKB_DR_SET(name, reason)    \
 (name = SKB_DROP_REASON_##reason)
#define SKB_DR_OR(name, reason)     \
 do {       \
  if (name == SKB_DROP_REASON_NOT_SPECIFIED || \
      name == SKB_NOT_DROPPED_YET)  \
   SKB_DR_SET(name, reason);  \
 } while (0)

#endif