1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 #ifndef _LINUX_DROPREASON_CORE_H
4 #define _LINUX_DROPREASON_CORE_H
6 #define DEFINE_DROP_REASON(FN, FNe) \
18 FN(UNICAST_IN_L2_MULTICAST) \
24 FN(TCP_MD5UNEXPECTED) \
32 FN(TCP_RFC7323_PAWS) \
33 FN(TCP_OLD_SEQUENCE) \
34 FN(TCP_INVALID_SEQUENCE) \
41 FN(TCP_ACK_UNSENT_DATA) \
42 FN(TCP_OFO_QUEUE_PRUNE) \
45 FN(BPF_CGROUP_EGRESS) \
47 FN(NEIGH_CREATEFAIL) \
73 FN(FRAG_REASM_TIMEOUT) \
78 FN(IPV6_NDISC_HOP_LIMIT) \
79 FN(IPV6_NDISC_BAD_CODE) \
80 FN(IPV6_NDISC_BAD_OPTIONS) \
81 FN(IPV6_NDISC_NS_OTHERHOST) \
86 * enum skb_drop_reason - the reasons of skb drops
88 * The reason of skb drop, which is used in kfree_skb_reason().
90 enum skb_drop_reason {
92 * @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case)
94 SKB_NOT_DROPPED_YET = 0,
95 /** @SKB_CONSUMED: packet has been consumed */
97 /** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */
98 SKB_DROP_REASON_NOT_SPECIFIED,
99 /** @SKB_DROP_REASON_NO_SOCKET: socket not found */
100 SKB_DROP_REASON_NO_SOCKET,
101 /** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */
102 SKB_DROP_REASON_PKT_TOO_SMALL,
103 /** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */
104 SKB_DROP_REASON_TCP_CSUM,
105 /** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */
106 SKB_DROP_REASON_SOCKET_FILTER,
107 /** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */
108 SKB_DROP_REASON_UDP_CSUM,
109 /** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */
110 SKB_DROP_REASON_NETFILTER_DROP,
112 * @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host
113 * (interface is in promisc mode)
115 SKB_DROP_REASON_OTHERHOST,
116 /** @SKB_DROP_REASON_IP_CSUM: IP checksum error */
117 SKB_DROP_REASON_IP_CSUM,
119 * @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see
120 * IPSTATS_MIB_INHDRERRORS)
122 SKB_DROP_REASON_IP_INHDR,
124 * @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the
125 * document for rp_filter in ip-sysctl.rst for more information
127 SKB_DROP_REASON_IP_RPFILTER,
129 * @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is
130 * multicast, but L3 is unicast.
132 SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST,
133 /** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */
134 SKB_DROP_REASON_XFRM_POLICY,
135 /** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */
136 SKB_DROP_REASON_IP_NOPROTO,
137 /** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */
138 SKB_DROP_REASON_SOCKET_RCVBUFF,
140 * @SKB_DROP_REASON_PROTO_MEM: proto memory limition, such as udp packet
141 * drop out of udp_memory_allocated.
143 SKB_DROP_REASON_PROTO_MEM,
145 * @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected,
146 * corresponding to LINUX_MIB_TCPMD5NOTFOUND
148 SKB_DROP_REASON_TCP_MD5NOTFOUND,
150 * @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting
151 * one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED
153 SKB_DROP_REASON_TCP_MD5UNEXPECTED,
155 * @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding
156 * to LINUX_MIB_TCPMD5FAILURE
158 SKB_DROP_REASON_TCP_MD5FAILURE,
160 * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog (
161 * see LINUX_MIB_TCPBACKLOGDROP)
163 SKB_DROP_REASON_SOCKET_BACKLOG,
164 /** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */
165 SKB_DROP_REASON_TCP_FLAGS,
167 * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero,
168 * see LINUX_MIB_TCPZEROWINDOWDROP
170 SKB_DROP_REASON_TCP_ZEROWINDOW,
172 * @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data reveived is already
173 * received before (spurious retrans may happened), see
174 * LINUX_MIB_DELAYEDACKLOST
176 SKB_DROP_REASON_TCP_OLD_DATA,
178 * @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window,
179 * the seq of the first byte exceed the right edges of receive
182 SKB_DROP_REASON_TCP_OVERWINDOW,
184 * @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo
185 * queue, corresponding to LINUX_MIB_TCPOFOMERGE
187 SKB_DROP_REASON_TCP_OFOMERGE,
189 * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to
190 * LINUX_MIB_PAWSESTABREJECTED
192 SKB_DROP_REASON_TCP_RFC7323_PAWS,
193 /** @SKB_DROP_REASON_TCP_OLD_SEQUENCE: Old SEQ field (duplicate packet) */
194 SKB_DROP_REASON_TCP_OLD_SEQUENCE,
195 /** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */
196 SKB_DROP_REASON_TCP_INVALID_SEQUENCE,
197 /** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */
198 SKB_DROP_REASON_TCP_RESET,
200 * @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected
203 SKB_DROP_REASON_TCP_INVALID_SYN,
204 /** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */
205 SKB_DROP_REASON_TCP_CLOSE,
206 /** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */
207 SKB_DROP_REASON_TCP_FASTOPEN,
208 /** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */
209 SKB_DROP_REASON_TCP_OLD_ACK,
210 /** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */
211 SKB_DROP_REASON_TCP_TOO_OLD_ACK,
213 * @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't
216 SKB_DROP_REASON_TCP_ACK_UNSENT_DATA,
217 /** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */
218 SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE,
219 /** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */
220 SKB_DROP_REASON_TCP_OFO_DROP,
221 /** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */
222 SKB_DROP_REASON_IP_OUTNOROUTES,
224 * @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB
227 SKB_DROP_REASON_BPF_CGROUP_EGRESS,
228 /** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */
229 SKB_DROP_REASON_IPV6DISABLED,
230 /** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */
231 SKB_DROP_REASON_NEIGH_CREATEFAIL,
232 /** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */
233 SKB_DROP_REASON_NEIGH_FAILED,
234 /** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */
235 SKB_DROP_REASON_NEIGH_QUEUEFULL,
236 /** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */
237 SKB_DROP_REASON_NEIGH_DEAD,
238 /** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */
239 SKB_DROP_REASON_TC_EGRESS,
241 * @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting (
242 * failed to enqueue to current qdisc)
244 SKB_DROP_REASON_QDISC_DROP,
246 * @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU
247 * backlog queue. This can be caused by backlog queue full (see
248 * netdev_max_backlog in net.rst) or RPS flow limit
250 SKB_DROP_REASON_CPU_BACKLOG,
251 /** @SKB_DROP_REASON_XDP: dropped by XDP in input path */
253 /** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */
254 SKB_DROP_REASON_TC_INGRESS,
255 /** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */
256 SKB_DROP_REASON_UNHANDLED_PROTO,
257 /** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */
258 SKB_DROP_REASON_SKB_CSUM,
259 /** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */
260 SKB_DROP_REASON_SKB_GSO_SEG,
262 * @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space,
263 * e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx()
265 SKB_DROP_REASON_SKB_UCOPY_FAULT,
266 /** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */
267 SKB_DROP_REASON_DEV_HDR,
269 * @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to
270 * any of its data structure that is not up/ready/initialized,
271 * e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq]
274 SKB_DROP_REASON_DEV_READY,
275 /** @SKB_DROP_REASON_FULL_RING: ring buffer is full */
276 SKB_DROP_REASON_FULL_RING,
277 /** @SKB_DROP_REASON_NOMEM: error due to OOM */
278 SKB_DROP_REASON_NOMEM,
280 * @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from
281 * networking data, e.g., failed to pull the protocol header from
282 * frags via pskb_may_pull()
284 SKB_DROP_REASON_HDR_TRUNC,
286 * @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached
287 * to tun/tap, e.g., via TUNSETFILTEREBPF
289 SKB_DROP_REASON_TAP_FILTER,
291 * @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at
292 * tun/tap, e.g., check_filter()
294 SKB_DROP_REASON_TAP_TXFILTER,
295 /** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */
296 SKB_DROP_REASON_ICMP_CSUM,
298 * @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211,
299 * such as a broadcasts ICMP_TIMESTAMP
301 SKB_DROP_REASON_INVALID_PROTO,
303 * @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to
304 * IPSTATS_MIB_INADDRERRORS
306 SKB_DROP_REASON_IP_INADDRERRORS,
308 * @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to
309 * IPSTATS_MIB_INADDRERRORS
311 SKB_DROP_REASON_IP_INNOROUTES,
313 * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the
316 SKB_DROP_REASON_PKT_TOO_BIG,
317 /** @SKB_DROP_REASON_DUP_FRAG: duplicate fragment */
318 SKB_DROP_REASON_DUP_FRAG,
319 /** @SKB_DROP_REASON_FRAG_REASM_TIMEOUT: fragment reassembly timeout */
320 SKB_DROP_REASON_FRAG_REASM_TIMEOUT,
322 * @SKB_DROP_REASON_FRAG_TOO_FAR: ipv4 fragment too far.
323 * (/proc/sys/net/ipv4/ipfrag_max_dist)
325 SKB_DROP_REASON_FRAG_TOO_FAR,
327 * @SKB_DROP_REASON_TCP_MINTTL: ipv4 ttl or ipv6 hoplimit below
328 * the threshold (IP_MINTTL or IPV6_MINHOPCOUNT).
330 SKB_DROP_REASON_TCP_MINTTL,
331 /** @SKB_DROP_REASON_IPV6_BAD_EXTHDR: Bad IPv6 extension header. */
332 SKB_DROP_REASON_IPV6_BAD_EXTHDR,
333 /** @SKB_DROP_REASON_IPV6_NDISC_FRAG: invalid frag (suppress_frag_ndisc). */
334 SKB_DROP_REASON_IPV6_NDISC_FRAG,
335 /** @SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT: invalid hop limit. */
336 SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT,
337 /** @SKB_DROP_REASON_IPV6_NDISC_BAD_CODE: invalid NDISC icmp6 code. */
338 SKB_DROP_REASON_IPV6_NDISC_BAD_CODE,
339 /** @SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS: invalid NDISC options. */
340 SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS,
342 * @SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST: NEIGHBOUR SOLICITATION
345 SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST,
346 /** @SKB_DROP_REASON_QUEUE_PURGE: bulk free. */
347 SKB_DROP_REASON_QUEUE_PURGE,
349 * @SKB_DROP_REASON_MAX: the maximum of core drop reasons, which
350 * shouldn't be used as a real 'reason' - only for tracing code gen
355 * @SKB_DROP_REASON_SUBSYS_MASK: subsystem mask in drop reasons,
356 * see &enum skb_drop_reason_subsys
358 SKB_DROP_REASON_SUBSYS_MASK = 0xffff0000,
361 #define SKB_DROP_REASON_SUBSYS_SHIFT 16
363 #define SKB_DR_INIT(name, reason) \
364 enum skb_drop_reason name = SKB_DROP_REASON_##reason
365 #define SKB_DR(name) \
366 SKB_DR_INIT(name, NOT_SPECIFIED)
367 #define SKB_DR_SET(name, reason) \
368 (name = SKB_DROP_REASON_##reason)
369 #define SKB_DR_OR(name, reason) \
371 if (name == SKB_DROP_REASON_NOT_SPECIFIED || \
372 name == SKB_NOT_DROPPED_YET) \
373 SKB_DR_SET(name, reason); \