name : 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_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_ZEROWINDOW) \ FN(TCP_OLD_DATA) \ FN(TCP_OVERWINDOW) \ FN(TCP_OFOMERGE) \ FN(TCP_RFC7323_PAWS) \ FN(TCP_OLD_SEQUENCE) \ 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) \ FN(QUEUE_PURGE) \ FN(TC_COOKIE_ERROR) \ FN(PACKET_SOCK_ERROR) \ FN(TC_CHAIN_NOTFOUND) \ FN(TC_RECLASSIFY_LOOP) \ 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_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_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_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_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_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_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