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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _LINUX_DROPREASON_H
#define _LINUX_DROPREASON_H
/* The reason of skb drop, which is used in kfree_skb_reason().
* en...maybe they should be splited by group?
*
* Each item here should also be in 'TRACE_SKB_DROP_REASON', which is
* used to translate the reason to string.
*/
enum skb_drop_reason {
SKB_NOT_DROPPED_YET = 0,
SKB_DROP_REASON_NOT_SPECIFIED, /* drop reason is not specified */
SKB_DROP_REASON_NO_SOCKET, /* socket not found */
SKB_DROP_REASON_PKT_TOO_SMALL, /* packet size is too small */
SKB_DROP_REASON_TCP_CSUM, /* TCP checksum error */
SKB_DROP_REASON_SOCKET_FILTER, /* dropped by socket filter */
SKB_DROP_REASON_UDP_CSUM, /* UDP checksum error */
SKB_DROP_REASON_NETFILTER_DROP, /* dropped by netfilter */
SKB_DROP_REASON_OTHERHOST, /* packet don't belong to current
* host (interface is in promisc
* mode)
*/
SKB_DROP_REASON_IP_CSUM, /* IP checksum error */
SKB_DROP_REASON_IP_INHDR, /* there is something wrong with
* IP header (see
* IPSTATS_MIB_INHDRERRORS)
*/
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_UNICAST_IN_L2_MULTICAST, /* destination address of L2
* is multicast, but L3 is
* unicast.
*/
SKB_DROP_REASON_XFRM_POLICY, /* xfrm policy check failed */
SKB_DROP_REASON_IP_NOPROTO, /* no support for IP protocol */
SKB_DROP_REASON_SOCKET_RCVBUFF, /* socket receive buff is full */
SKB_DROP_REASON_PROTO_MEM, /* proto memory limition, such as
* udp packet drop out of
* udp_memory_allocated.
*/
SKB_DROP_REASON_TCP_MD5NOTFOUND, /* no MD5 hash and one
* expected, corresponding
* to LINUX_MIB_TCPMD5NOTFOUND
*/
SKB_DROP_REASON_TCP_MD5UNEXPECTED, /* MD5 hash and we're not
* expecting one, corresponding
* to LINUX_MIB_TCPMD5UNEXPECTED
*/
SKB_DROP_REASON_TCP_MD5FAILURE, /* MD5 hash and its wrong,
* corresponding to
* LINUX_MIB_TCPMD5FAILURE
*/
SKB_DROP_REASON_SOCKET_BACKLOG, /* failed to add skb to socket
* backlog (see
* LINUX_MIB_TCPBACKLOGDROP)
*/
SKB_DROP_REASON_TCP_FLAGS, /* TCP flags invalid */
SKB_DROP_REASON_TCP_ZEROWINDOW, /* TCP receive window size is zero,
* see LINUX_MIB_TCPZEROWINDOWDROP
*/
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_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_OFOMERGE, /* the data of skb is already in
* the ofo queue, corresponding to
* LINUX_MIB_TCPOFOMERGE
*/
SKB_DROP_REASON_TCP_RFC7323_PAWS, /* PAWS check, corresponding to
* LINUX_MIB_PAWSESTABREJECTED
*/
SKB_DROP_REASON_TCP_INVALID_SEQUENCE, /* Not acceptable SEQ field */
SKB_DROP_REASON_TCP_RESET, /* Invalid RST packet */
SKB_DROP_REASON_TCP_INVALID_SYN, /* Incoming packet has unexpected SYN flag */
SKB_DROP_REASON_TCP_CLOSE, /* TCP socket in CLOSE state */
SKB_DROP_REASON_TCP_FASTOPEN, /* dropped by FASTOPEN request socket */
SKB_DROP_REASON_TCP_OLD_ACK, /* TCP ACK is old, but in window */
SKB_DROP_REASON_TCP_TOO_OLD_ACK, /* TCP ACK is too old */
SKB_DROP_REASON_TCP_ACK_UNSENT_DATA, /* TCP ACK for data we haven't sent yet */
SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE, /* pruned from TCP OFO queue */
SKB_DROP_REASON_TCP_OFO_DROP, /* data already in receive queue */
SKB_DROP_REASON_IP_OUTNOROUTES, /* route lookup failed */
SKB_DROP_REASON_BPF_CGROUP_EGRESS, /* dropped by
* BPF_PROG_TYPE_CGROUP_SKB
* eBPF program
*/
SKB_DROP_REASON_IPV6DISABLED, /* IPv6 is disabled on the device */
SKB_DROP_REASON_NEIGH_CREATEFAIL, /* failed to create neigh
* entry
*/
SKB_DROP_REASON_NEIGH_FAILED, /* neigh entry in failed state */
SKB_DROP_REASON_NEIGH_QUEUEFULL, /* arp_queue for neigh
* entry is full
*/
SKB_DROP_REASON_NEIGH_DEAD, /* neigh entry is dead */
SKB_DROP_REASON_TC_EGRESS, /* dropped in TC egress HOOK */
SKB_DROP_REASON_QDISC_DROP, /* dropped by qdisc when packet
* outputting (failed to enqueue to
* current qdisc)
*/
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_XDP, /* dropped by XDP in input path */
SKB_DROP_REASON_TC_INGRESS, /* dropped in TC ingress HOOK */
SKB_DROP_REASON_UNHANDLED_PROTO, /* protocol not implemented
* or not supported
*/
SKB_DROP_REASON_SKB_CSUM, /* sk_buff checksum computation
* error
*/
SKB_DROP_REASON_SKB_GSO_SEG, /* gso segmentation error */
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_DEV_HDR, /* device driver specific
* header/metadata is invalid
*/
/* 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_NOMEM, /* error due to OOM */
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_TAP_FILTER, /* dropped by (ebpf) filter directly
* attached to tun/tap, e.g., via
* TUNSETFILTEREBPF
*/
SKB_DROP_REASON_TAP_TXFILTER, /* dropped by tx filter implemented
* at tun/tap, e.g., check_filter()
*/
SKB_DROP_REASON_ICMP_CSUM, /* ICMP checksum error */
SKB_DROP_REASON_INVALID_PROTO, /* the packet doesn't follow RFC
* 2211, such as a broadcasts
* ICMP_TIMESTAMP
*/
SKB_DROP_REASON_IP_INADDRERRORS, /* host unreachable, corresponding
* to IPSTATS_MIB_INADDRERRORS
*/
SKB_DROP_REASON_IP_INNOROUTES, /* network unreachable, corresponding
* to IPSTATS_MIB_INADDRERRORS
*/
SKB_DROP_REASON_PKT_TOO_BIG, /* packet size is too big (maybe exceed
* the MTU)
*/
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
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