| /* 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) \ |
| FN(TCP_MINTTL) \ |
| 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_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 |
