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linux/include/net/dropreason-core.h
Johannes Berg 071c0fc6fb net: extend drop reasons for multiple subsystems 
Extend drop reasons to make them usable by subsystems
other than core by reserving the high 16 bits for a
new subsystem ID, of which 0 of course is used for the
existing reasons immediately.

To still be able to have string reasons, restructure
that code a bit to make the loopup under RCU, the only
user of this (right now) is drop_monitor.

Link: https://lore.kernel.org/netdev/00659771ed54353f92027702c5bbb84702da62ce.camel@sipsolutions.net
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-04-20 20:20:49 -07:00

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/* 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
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