/* SPDX-License-Identifier: GPL-2.0-or-later */ #ifndef _LINUX_DROPREASON_H#define _LINUX_DROPREASON_H #define DEFINE_DROP_REASON(FN, FNe)	\	FN(NOT_SPECIFIED)		\	FN(NO_SOCKET)			\	FN(PKT_TOO_SMALL)		\	FN(TCP_CSUM)			\	FN(SOCKET_FILTER)		\	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(SOCKET_RCVBUFF)		\	FN(PROTO_MEM)			\	FN(TCP_MD5NOTFOUND)		\	FN(TCP_MD5UNEXPECTED)		\	FN(TCP_MD5FAILURE)		\	FN(SOCKET_BACKLOG)		\	FN(TCP_FLAGS)			\	FN(TCP_ZEROWINDOW)		\	FN(TCP_OLD_DATA)		\	FN(TCP_OVERWINDOW)		\	FN(TCP_OFOMERGE)		\	FN(TCP_RFC7323_PAWS)		\	FN(TCP_INVALID_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(TC_EGRESS)			\	FN(QDISC_DROP)			\	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(PKT_TOO_BIG)			\	FN(DUP_FRAG)			\	FN(FRAG_REASM_TIMEOUT)		\	FN(FRAG_TOO_FAR)		\	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: socket not found */	SKB_DROP_REASON_NO_SOCKET,	/** @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_SOCKET_FILTER: dropped by socket filter */	SKB_DROP_REASON_SOCKET_FILTER,	/** @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_SOCKET_RCVBUFF: socket receive buff is full */	SKB_DROP_REASON_SOCKET_RCVBUFF,	/**	 * @SKB_DROP_REASON_PROTO_MEM: proto memory limition, such as udp packet	 * drop out of udp_memory_allocated.	 */	SKB_DROP_REASON_PROTO_MEM,	/**	 * @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_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_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 reveived 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	 */	SKB_DROP_REASON_TCP_RFC7323_PAWS,	/** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */	SKB_DROP_REASON_TCP_INVALID_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_TC_EGRESS: dropped in TC egress HOOK */	SKB_DROP_REASON_TC_EGRESS,	/**	 * @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_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_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_MAX: the maximum of drop reason, which shouldn't be	 * used as a real 'reason'	 */	SKB_DROP_REASON_MAX,}; #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) extern const char * const drop_reasons[]; #endif