| /* 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 |