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185 lines
6.9 KiB
C
185 lines
6.9 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _LINUX_DROPREASON_H
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#define _LINUX_DROPREASON_H
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/* The reason of skb drop, which is used in kfree_skb_reason().
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* en...maybe they should be splited by group?
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*
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* Each item here should also be in 'TRACE_SKB_DROP_REASON', which is
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* used to translate the reason to string.
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*/
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enum skb_drop_reason {
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SKB_NOT_DROPPED_YET = 0,
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SKB_DROP_REASON_NOT_SPECIFIED, /* drop reason is not specified */
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SKB_DROP_REASON_NO_SOCKET, /* socket not found */
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SKB_DROP_REASON_PKT_TOO_SMALL, /* packet size is too small */
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SKB_DROP_REASON_TCP_CSUM, /* TCP checksum error */
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SKB_DROP_REASON_SOCKET_FILTER, /* dropped by socket filter */
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SKB_DROP_REASON_UDP_CSUM, /* UDP checksum error */
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SKB_DROP_REASON_NETFILTER_DROP, /* dropped by netfilter */
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SKB_DROP_REASON_OTHERHOST, /* packet don't belong to current
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* host (interface is in promisc
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* mode)
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*/
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SKB_DROP_REASON_IP_CSUM, /* IP checksum error */
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SKB_DROP_REASON_IP_INHDR, /* there is something wrong with
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* IP header (see
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* IPSTATS_MIB_INHDRERRORS)
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*/
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SKB_DROP_REASON_IP_RPFILTER, /* IP rpfilter validate failed.
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* see the document for rp_filter
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* in ip-sysctl.rst for more
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* information
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*/
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SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST, /* destination address of L2
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* is multicast, but L3 is
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* unicast.
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*/
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SKB_DROP_REASON_XFRM_POLICY, /* xfrm policy check failed */
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SKB_DROP_REASON_IP_NOPROTO, /* no support for IP protocol */
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SKB_DROP_REASON_SOCKET_RCVBUFF, /* socket receive buff is full */
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SKB_DROP_REASON_PROTO_MEM, /* proto memory limition, such as
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* udp packet drop out of
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* udp_memory_allocated.
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*/
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SKB_DROP_REASON_TCP_MD5NOTFOUND, /* no MD5 hash and one
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* expected, corresponding
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* to LINUX_MIB_TCPMD5NOTFOUND
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*/
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SKB_DROP_REASON_TCP_MD5UNEXPECTED, /* MD5 hash and we're not
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* expecting one, corresponding
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* to LINUX_MIB_TCPMD5UNEXPECTED
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*/
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SKB_DROP_REASON_TCP_MD5FAILURE, /* MD5 hash and its wrong,
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* corresponding to
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* LINUX_MIB_TCPMD5FAILURE
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*/
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SKB_DROP_REASON_SOCKET_BACKLOG, /* failed to add skb to socket
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* backlog (see
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* LINUX_MIB_TCPBACKLOGDROP)
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*/
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SKB_DROP_REASON_TCP_FLAGS, /* TCP flags invalid */
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SKB_DROP_REASON_TCP_ZEROWINDOW, /* TCP receive window size is zero,
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* see LINUX_MIB_TCPZEROWINDOWDROP
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*/
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SKB_DROP_REASON_TCP_OLD_DATA, /* the TCP data reveived is already
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* received before (spurious retrans
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* may happened), see
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* LINUX_MIB_DELAYEDACKLOST
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*/
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SKB_DROP_REASON_TCP_OVERWINDOW, /* the TCP data is out of window,
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* the seq of the first byte exceed
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* the right edges of receive
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* window
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*/
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SKB_DROP_REASON_TCP_OFOMERGE, /* the data of skb is already in
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* the ofo queue, corresponding to
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* LINUX_MIB_TCPOFOMERGE
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*/
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SKB_DROP_REASON_TCP_RFC7323_PAWS, /* PAWS check, corresponding to
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* LINUX_MIB_PAWSESTABREJECTED
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*/
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SKB_DROP_REASON_TCP_INVALID_SEQUENCE, /* Not acceptable SEQ field */
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SKB_DROP_REASON_TCP_RESET, /* Invalid RST packet */
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SKB_DROP_REASON_TCP_INVALID_SYN, /* Incoming packet has unexpected SYN flag */
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SKB_DROP_REASON_TCP_CLOSE, /* TCP socket in CLOSE state */
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SKB_DROP_REASON_TCP_FASTOPEN, /* dropped by FASTOPEN request socket */
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SKB_DROP_REASON_TCP_OLD_ACK, /* TCP ACK is old, but in window */
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SKB_DROP_REASON_TCP_TOO_OLD_ACK, /* TCP ACK is too old */
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SKB_DROP_REASON_TCP_ACK_UNSENT_DATA, /* TCP ACK for data we haven't sent yet */
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SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE, /* pruned from TCP OFO queue */
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SKB_DROP_REASON_TCP_OFO_DROP, /* data already in receive queue */
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SKB_DROP_REASON_IP_OUTNOROUTES, /* route lookup failed */
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SKB_DROP_REASON_BPF_CGROUP_EGRESS, /* dropped by
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* BPF_PROG_TYPE_CGROUP_SKB
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* eBPF program
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*/
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SKB_DROP_REASON_IPV6DISABLED, /* IPv6 is disabled on the device */
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SKB_DROP_REASON_NEIGH_CREATEFAIL, /* failed to create neigh
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* entry
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*/
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SKB_DROP_REASON_NEIGH_FAILED, /* neigh entry in failed state */
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SKB_DROP_REASON_NEIGH_QUEUEFULL, /* arp_queue for neigh
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* entry is full
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*/
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SKB_DROP_REASON_NEIGH_DEAD, /* neigh entry is dead */
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SKB_DROP_REASON_TC_EGRESS, /* dropped in TC egress HOOK */
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SKB_DROP_REASON_QDISC_DROP, /* dropped by qdisc when packet
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* outputting (failed to enqueue to
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* current qdisc)
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*/
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SKB_DROP_REASON_CPU_BACKLOG, /* failed to enqueue the skb to
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* the per CPU backlog queue. This
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* can be caused by backlog queue
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* full (see netdev_max_backlog in
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* net.rst) or RPS flow limit
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*/
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SKB_DROP_REASON_XDP, /* dropped by XDP in input path */
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SKB_DROP_REASON_TC_INGRESS, /* dropped in TC ingress HOOK */
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SKB_DROP_REASON_UNHANDLED_PROTO, /* protocol not implemented
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* or not supported
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*/
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SKB_DROP_REASON_SKB_CSUM, /* sk_buff checksum computation
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* error
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*/
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SKB_DROP_REASON_SKB_GSO_SEG, /* gso segmentation error */
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SKB_DROP_REASON_SKB_UCOPY_FAULT, /* failed to copy data from
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* user space, e.g., via
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* zerocopy_sg_from_iter()
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* or skb_orphan_frags_rx()
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*/
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SKB_DROP_REASON_DEV_HDR, /* device driver specific
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* header/metadata is invalid
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*/
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/* the device is not ready to xmit/recv due to any of its data
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* structure that is not up/ready/initialized, e.g., the IFF_UP is
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* not set, or driver specific tun->tfiles[txq] is not initialized
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*/
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SKB_DROP_REASON_DEV_READY,
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SKB_DROP_REASON_FULL_RING, /* ring buffer is full */
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SKB_DROP_REASON_NOMEM, /* error due to OOM */
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SKB_DROP_REASON_HDR_TRUNC, /* failed to trunc/extract the header
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* from networking data, e.g., failed
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* to pull the protocol header from
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* frags via pskb_may_pull()
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*/
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SKB_DROP_REASON_TAP_FILTER, /* dropped by (ebpf) filter directly
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* attached to tun/tap, e.g., via
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* TUNSETFILTEREBPF
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*/
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SKB_DROP_REASON_TAP_TXFILTER, /* dropped by tx filter implemented
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* at tun/tap, e.g., check_filter()
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*/
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SKB_DROP_REASON_ICMP_CSUM, /* ICMP checksum error */
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SKB_DROP_REASON_INVALID_PROTO, /* the packet doesn't follow RFC
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* 2211, such as a broadcasts
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* ICMP_TIMESTAMP
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*/
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SKB_DROP_REASON_IP_INADDRERRORS, /* host unreachable, corresponding
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* to IPSTATS_MIB_INADDRERRORS
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*/
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SKB_DROP_REASON_IP_INNOROUTES, /* network unreachable, corresponding
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* to IPSTATS_MIB_INADDRERRORS
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*/
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SKB_DROP_REASON_PKT_TOO_BIG, /* packet size is too big (maybe exceed
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* the MTU)
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*/
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SKB_DROP_REASON_MAX,
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};
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#define SKB_DR_INIT(name, reason) \
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enum skb_drop_reason name = SKB_DROP_REASON_##reason
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#define SKB_DR(name) \
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SKB_DR_INIT(name, NOT_SPECIFIED)
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#define SKB_DR_SET(name, reason) \
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(name = SKB_DROP_REASON_##reason)
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#define SKB_DR_OR(name, reason) \
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do { \
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if (name == SKB_DROP_REASON_NOT_SPECIFIED || \
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name == SKB_NOT_DROPPED_YET) \
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SKB_DR_SET(name, reason); \
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} while (0)
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#endif
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