[linux-block.git] / include / net / dropreason-core.h

/* 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(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)		\
	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)	\
	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_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_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
Commit	Line	Data
ff8372a4 MD	1	/* SPDX-License-Identifier: GPL-2.0-or-later */
ff8372a4 MD	2
5b8285cc JB	3	#ifndef _LINUX_DROPREASON_CORE_H
5b8285cc JB	4	#define _LINUX_DROPREASON_CORE_H
ff8372a4	5
9cb252c4 MD	6	#define DEFINE_DROP_REASON(FN, FNe) \
	7	FN(NOT_SPECIFIED) \
	8	FN(NO_SOCKET) \
	9	FN(PKT_TOO_SMALL) \
	10	FN(TCP_CSUM) \
	11	FN(SOCKET_FILTER) \
	12	FN(UDP_CSUM) \
	13	FN(NETFILTER_DROP) \
	14	FN(OTHERHOST) \
	15	FN(IP_CSUM) \
	16	FN(IP_INHDR) \
	17	FN(IP_RPFILTER) \
	18	FN(UNICAST_IN_L2_MULTICAST) \
	19	FN(XFRM_POLICY) \
	20	FN(IP_NOPROTO) \
	21	FN(SOCKET_RCVBUFF) \
	22	FN(PROTO_MEM) \
	23	FN(TCP_MD5NOTFOUND) \
	24	FN(TCP_MD5UNEXPECTED) \
	25	FN(TCP_MD5FAILURE) \
	26	FN(SOCKET_BACKLOG) \
	27	FN(TCP_FLAGS) \
	28	FN(TCP_ZEROWINDOW) \
	29	FN(TCP_OLD_DATA) \
	30	FN(TCP_OVERWINDOW) \
	31	FN(TCP_OFOMERGE) \
	32	FN(TCP_RFC7323_PAWS) \
	33	FN(TCP_INVALID_SEQUENCE) \
	34	FN(TCP_RESET) \
	35	FN(TCP_INVALID_SYN) \
	36	FN(TCP_CLOSE) \
	37	FN(TCP_FASTOPEN) \
	38	FN(TCP_OLD_ACK) \
	39	FN(TCP_TOO_OLD_ACK) \
	40	FN(TCP_ACK_UNSENT_DATA) \
	41	FN(TCP_OFO_QUEUE_PRUNE) \
	42	FN(TCP_OFO_DROP) \
	43	FN(IP_OUTNOROUTES) \
	44	FN(BPF_CGROUP_EGRESS) \
	45	FN(IPV6DISABLED) \
	46	FN(NEIGH_CREATEFAIL) \
	47	FN(NEIGH_FAILED) \
	48	FN(NEIGH_QUEUEFULL) \
	49	FN(NEIGH_DEAD) \
	50	FN(TC_EGRESS) \
	51	FN(QDISC_DROP) \
	52	FN(CPU_BACKLOG) \
	53	FN(XDP) \
	54	FN(TC_INGRESS) \
	55	FN(UNHANDLED_PROTO) \
	56	FN(SKB_CSUM) \
	57	FN(SKB_GSO_SEG) \
	58	FN(SKB_UCOPY_FAULT) \
	59	FN(DEV_HDR) \
	60	FN(DEV_READY) \
	61	FN(FULL_RING) \
	62	FN(NOMEM) \
	63	FN(HDR_TRUNC) \
	64	FN(TAP_FILTER) \
	65	FN(TAP_TXFILTER) \
	66	FN(ICMP_CSUM) \
	67	FN(INVALID_PROTO) \
	68	FN(IP_INADDRERRORS) \
	69	FN(IP_INNOROUTES) \
70	FN(PKT_TOO_BIG) \
4ecbb1c2	71	FN(DUP_FRAG) \
77adfd3a	72	FN(FRAG_REASM_TIMEOUT) \
3bdfb04f	73	FN(FRAG_TOO_FAR) \
2798e36d	74	FN(TCP_MINTTL) \
dc68eaf2	75	FN(IPV6_BAD_EXTHDR) \
545dbcd1 ED	76	FN(IPV6_NDISC_FRAG) \
	77	FN(IPV6_NDISC_HOP_LIMIT) \
	78	FN(IPV6_NDISC_BAD_CODE) \
784d4477	79	FN(IPV6_NDISC_BAD_OPTIONS) \
c34b8bb1	80	FN(IPV6_NDISC_NS_OTHERHOST) \
9cb252c4 MD	81	FNe(MAX)
9cb252c4 MD	82
b160f727 MD	83	/**
b160f727 MD	84	* enum skb_drop_reason - the reasons of skb drops
ff8372a4	85	*
b160f727	86	* The reason of skb drop, which is used in kfree_skb_reason().
ff8372a4 MD	87	*/
ff8372a4 MD	88	enum skb_drop_reason {
b160f727 MD	89	/**
	90	* @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case)
	91	*/
ff8372a4	92	SKB_NOT_DROPPED_YET = 0,
0e84afe8 ED	93	/** @SKB_CONSUMED: packet has been consumed */
0e84afe8 ED	94	SKB_CONSUMED,
b160f727 MD	95	/** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */
	96	SKB_DROP_REASON_NOT_SPECIFIED,
	97	/** @SKB_DROP_REASON_NO_SOCKET: socket not found */
	98	SKB_DROP_REASON_NO_SOCKET,
	99	/** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */
	100	SKB_DROP_REASON_PKT_TOO_SMALL,
	101	/** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */
	102	SKB_DROP_REASON_TCP_CSUM,
	103	/** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */
	104	SKB_DROP_REASON_SOCKET_FILTER,
	105	/** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */
	106	SKB_DROP_REASON_UDP_CSUM,
	107	/** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */
	108	SKB_DROP_REASON_NETFILTER_DROP,
	109	/**
	110	* @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host
	111	* (interface is in promisc mode)
	112	*/
	113	SKB_DROP_REASON_OTHERHOST,
	114	/** @SKB_DROP_REASON_IP_CSUM: IP checksum error */
	115	SKB_DROP_REASON_IP_CSUM,
	116	/**
	117	* @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see
	118	* IPSTATS_MIB_INHDRERRORS)
	119	*/
	120	SKB_DROP_REASON_IP_INHDR,
	121	/**
	122	* @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the
	123	* document for rp_filter in ip-sysctl.rst for more information
	124	*/
	125	SKB_DROP_REASON_IP_RPFILTER,
	126	/**
	127	* @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is
	128	* multicast, but L3 is unicast.
	129	*/
	130	SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST,
	131	/** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */
	132	SKB_DROP_REASON_XFRM_POLICY,
	133	/** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */
	134	SKB_DROP_REASON_IP_NOPROTO,
	135	/** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */
	136	SKB_DROP_REASON_SOCKET_RCVBUFF,
	137	/**
	138	* @SKB_DROP_REASON_PROTO_MEM: proto memory limition, such as udp packet
	139	* drop out of udp_memory_allocated.
	140	*/
	141	SKB_DROP_REASON_PROTO_MEM,
	142	/**
	143	* @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected,
	144	* corresponding to LINUX_MIB_TCPMD5NOTFOUND
	145	*/
	146	SKB_DROP_REASON_TCP_MD5NOTFOUND,
	147	/**
	148	* @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting
	149	* one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED
	150	*/
	151	SKB_DROP_REASON_TCP_MD5UNEXPECTED,
	152	/**
	153	* @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding
	154	* to LINUX_MIB_TCPMD5FAILURE
	155	*/
	156	SKB_DROP_REASON_TCP_MD5FAILURE,
	157	/**
	158	* @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog (
159	* see LINUX_MIB_TCPBACKLOGDROP)
160	*/
161	SKB_DROP_REASON_SOCKET_BACKLOG,
162	/** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */
163	SKB_DROP_REASON_TCP_FLAGS,
164	/**
165	* @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero,
166	* see LINUX_MIB_TCPZEROWINDOWDROP
167	*/
168	SKB_DROP_REASON_TCP_ZEROWINDOW,
169	/**
170	* @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data reveived is already
171	* received before (spurious retrans may happened), see
172	* LINUX_MIB_DELAYEDACKLOST
173	*/
174	SKB_DROP_REASON_TCP_OLD_DATA,
175	/**
176	* @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window,
177	* the seq of the first byte exceed the right edges of receive
178	* window
179	*/
180	SKB_DROP_REASON_TCP_OVERWINDOW,
181	/**
182	* @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo
183	* queue, corresponding to LINUX_MIB_TCPOFOMERGE
184	*/
185	SKB_DROP_REASON_TCP_OFOMERGE,
186	/**
187	* @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to
188	* LINUX_MIB_PAWSESTABREJECTED
189	*/
190	SKB_DROP_REASON_TCP_RFC7323_PAWS,
191	/** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */
192	SKB_DROP_REASON_TCP_INVALID_SEQUENCE,
193	/** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */
194	SKB_DROP_REASON_TCP_RESET,
195	/**
196	* @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected
197	* SYN flag
198	*/
199	SKB_DROP_REASON_TCP_INVALID_SYN,
200	/** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */
201	SKB_DROP_REASON_TCP_CLOSE,
202	/** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */
203	SKB_DROP_REASON_TCP_FASTOPEN,
204	/** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */
205	SKB_DROP_REASON_TCP_OLD_ACK,
206	/** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */
207	SKB_DROP_REASON_TCP_TOO_OLD_ACK,
208	/**
209	* @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't
210	* sent yet
211	*/
212	SKB_DROP_REASON_TCP_ACK_UNSENT_DATA,
213	/** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */
214	SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE,
215	/** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */
216	SKB_DROP_REASON_TCP_OFO_DROP,
217	/** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */
218	SKB_DROP_REASON_IP_OUTNOROUTES,
219	/**
220	* @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB
221	* eBPF program
222	*/
223	SKB_DROP_REASON_BPF_CGROUP_EGRESS,
224	/** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */
225	SKB_DROP_REASON_IPV6DISABLED,
226	/** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */
227	SKB_DROP_REASON_NEIGH_CREATEFAIL,
228	/** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */
229	SKB_DROP_REASON_NEIGH_FAILED,
230	/** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */
231	SKB_DROP_REASON_NEIGH_QUEUEFULL,
232	/** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */
233	SKB_DROP_REASON_NEIGH_DEAD,
234	/** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */
235	SKB_DROP_REASON_TC_EGRESS,
236	/**
237	* @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting (
238	* failed to enqueue to current qdisc)
239	*/
240	SKB_DROP_REASON_QDISC_DROP,
241	/**
242	* @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU
243	* backlog queue. This can be caused by backlog queue full (see
244	* netdev_max_backlog in net.rst) or RPS flow limit
245	*/
246	SKB_DROP_REASON_CPU_BACKLOG,
247	/** @SKB_DROP_REASON_XDP: dropped by XDP in input path */
248	SKB_DROP_REASON_XDP,
249	/** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */
250	SKB_DROP_REASON_TC_INGRESS,
251	/** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */
252	SKB_DROP_REASON_UNHANDLED_PROTO,
253	/** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */
254	SKB_DROP_REASON_SKB_CSUM,
255	/** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */
256	SKB_DROP_REASON_SKB_GSO_SEG,
257	/**
258	* @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space,
259	* e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx()
260	*/
261	SKB_DROP_REASON_SKB_UCOPY_FAULT,
262	/** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */
263	SKB_DROP_REASON_DEV_HDR,
264	/**
265	* @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to
266	* any of its data structure that is not up/ready/initialized,
267	* e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq]
268	* is not initialized
ff8372a4 MD	269	*/
ff8372a4 MD	270	SKB_DROP_REASON_DEV_READY,
b160f727 MD	271	/** @SKB_DROP_REASON_FULL_RING: ring buffer is full */
	272	SKB_DROP_REASON_FULL_RING,
	273	/** @SKB_DROP_REASON_NOMEM: error due to OOM */
	274	SKB_DROP_REASON_NOMEM,
	275	/**
	276	* @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from
	277	* networking data, e.g., failed to pull the protocol header from
	278	* frags via pskb_may_pull()
	279	*/
	280	SKB_DROP_REASON_HDR_TRUNC,
	281	/**
	282	* @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached
	283	* to tun/tap, e.g., via TUNSETFILTEREBPF
	284	*/
	285	SKB_DROP_REASON_TAP_FILTER,
	286	/**
	287	* @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at
	288	* tun/tap, e.g., check_filter()
	289	*/
	290	SKB_DROP_REASON_TAP_TXFILTER,
	291	/** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */
	292	SKB_DROP_REASON_ICMP_CSUM,
	293	/**
	294	* @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211,
	295	* such as a broadcasts ICMP_TIMESTAMP
	296	*/
	297	SKB_DROP_REASON_INVALID_PROTO,
	298	/**
	299	* @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to
	300	* IPSTATS_MIB_INADDRERRORS
	301	*/
	302	SKB_DROP_REASON_IP_INADDRERRORS,
	303	/**
	304	* @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to
	305	* IPSTATS_MIB_INADDRERRORS
	306	*/
	307	SKB_DROP_REASON_IP_INNOROUTES,
	308	/**
	309	* @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the
	310	* MTU)
	311	*/
	312	SKB_DROP_REASON_PKT_TOO_BIG,
4ecbb1c2 ED	313	/** @SKB_DROP_REASON_DUP_FRAG: duplicate fragment */
4ecbb1c2 ED	314	SKB_DROP_REASON_DUP_FRAG,
77adfd3a ED	315	/** @SKB_DROP_REASON_FRAG_REASM_TIMEOUT: fragment reassembly timeout */
77adfd3a ED	316	SKB_DROP_REASON_FRAG_REASM_TIMEOUT,
3bdfb04f ED	317	/**
	318	* @SKB_DROP_REASON_FRAG_TOO_FAR: ipv4 fragment too far.
	319	* (/proc/sys/net/ipv4/ipfrag_max_dist)
	320	*/
	321	SKB_DROP_REASON_FRAG_TOO_FAR,
2798e36d ED	322	/**
	323	* @SKB_DROP_REASON_TCP_MINTTL: ipv4 ttl or ipv6 hoplimit below
	324	* the threshold (IP_MINTTL or IPV6_MINHOPCOUNT).
	325	*/
	326	SKB_DROP_REASON_TCP_MINTTL,
dc68eaf2 ED	327	/** @SKB_DROP_REASON_IPV6_BAD_EXTHDR: Bad IPv6 extension header. */
dc68eaf2 ED	328	SKB_DROP_REASON_IPV6_BAD_EXTHDR,
545dbcd1 ED	329	/** @SKB_DROP_REASON_IPV6_NDISC_FRAG: invalid frag (suppress_frag_ndisc). */
	330	SKB_DROP_REASON_IPV6_NDISC_FRAG,
	331	/** @SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT: invalid hop limit. */
	332	SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT,
	333	/** @SKB_DROP_REASON_IPV6_NDISC_BAD_CODE: invalid NDISC icmp6 code. */
	334	SKB_DROP_REASON_IPV6_NDISC_BAD_CODE,
784d4477 ED	335	/** @SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS: invalid NDISC options. */
784d4477 ED	336	SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS,
5b8285cc JB	337	/**
5b8285cc JB	338	* @SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST: NEIGHBOUR SOLICITATION
c34b8bb1 ED	339	* for another host.
	340	*/
	341	SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST,
b160f727	342	/**
071c0fc6 JB	343	* @SKB_DROP_REASON_MAX: the maximum of core drop reasons, which
071c0fc6 JB	344	* shouldn't be used as a real 'reason' - only for tracing code gen
b160f727	345	*/
ff8372a4	346	SKB_DROP_REASON_MAX,
071c0fc6 JB	347
	348	/**
	349	* @SKB_DROP_REASON_SUBSYS_MASK: subsystem mask in drop reasons,
	350	* see &enum skb_drop_reason_subsys
	351	*/
	352	SKB_DROP_REASON_SUBSYS_MASK = 0xffff0000,
ff8372a4 MD	353	};
ff8372a4 MD	354
071c0fc6 JB	355	#define SKB_DROP_REASON_SUBSYS_SHIFT 16
071c0fc6 JB	356
ff8372a4 MD	357	#define SKB_DR_INIT(name, reason) \
	358	enum skb_drop_reason name = SKB_DROP_REASON_##reason
	359	#define SKB_DR(name) \
	360	SKB_DR_INIT(name, NOT_SPECIFIED)
	361	#define SKB_DR_SET(name, reason) \
	362	(name = SKB_DROP_REASON_##reason)
	363	#define SKB_DR_OR(name, reason) \
	364	do { \
	365	if (name == SKB_DROP_REASON_NOT_SPECIFIED \|\| \
	366	name == SKB_NOT_DROPPED_YET) \
	367	SKB_DR_SET(name, reason); \
	368	} while (0)
	369
	370	#endif