1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 #ifndef _LINUX_DROPREASON_H
4 #define _LINUX_DROPREASON_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_INVALID_SEQUENCE) \
40 FN(TCP_ACK_UNSENT_DATA) \
41 FN(TCP_OFO_QUEUE_PRUNE) \
44 FN(BPF_CGROUP_EGRESS) \
46 FN(NEIGH_CREATEFAIL) \
72 FN(FRAG_REASM_TIMEOUT) \
77 * enum skb_drop_reason - the reasons of skb drops
79 * The reason of skb drop, which is used in kfree_skb_reason().
81 enum skb_drop_reason {
83 * @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case)
85 SKB_NOT_DROPPED_YET = 0,
86 /** @SKB_CONSUMED: packet has been consumed */
88 /** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */
89 SKB_DROP_REASON_NOT_SPECIFIED,
90 /** @SKB_DROP_REASON_NO_SOCKET: socket not found */
91 SKB_DROP_REASON_NO_SOCKET,
92 /** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */
93 SKB_DROP_REASON_PKT_TOO_SMALL,
94 /** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */
95 SKB_DROP_REASON_TCP_CSUM,
96 /** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */
97 SKB_DROP_REASON_SOCKET_FILTER,
98 /** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */
99 SKB_DROP_REASON_UDP_CSUM,
100 /** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */
101 SKB_DROP_REASON_NETFILTER_DROP,
103 * @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host
104 * (interface is in promisc mode)
106 SKB_DROP_REASON_OTHERHOST,
107 /** @SKB_DROP_REASON_IP_CSUM: IP checksum error */
108 SKB_DROP_REASON_IP_CSUM,
110 * @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see
111 * IPSTATS_MIB_INHDRERRORS)
113 SKB_DROP_REASON_IP_INHDR,
115 * @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the
116 * document for rp_filter in ip-sysctl.rst for more information
118 SKB_DROP_REASON_IP_RPFILTER,
120 * @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is
121 * multicast, but L3 is unicast.
123 SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST,
124 /** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */
125 SKB_DROP_REASON_XFRM_POLICY,
126 /** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */
127 SKB_DROP_REASON_IP_NOPROTO,
128 /** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */
129 SKB_DROP_REASON_SOCKET_RCVBUFF,
131 * @SKB_DROP_REASON_PROTO_MEM: proto memory limition, such as udp packet
132 * drop out of udp_memory_allocated.
134 SKB_DROP_REASON_PROTO_MEM,
136 * @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected,
137 * corresponding to LINUX_MIB_TCPMD5NOTFOUND
139 SKB_DROP_REASON_TCP_MD5NOTFOUND,
141 * @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting
142 * one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED
144 SKB_DROP_REASON_TCP_MD5UNEXPECTED,
146 * @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding
147 * to LINUX_MIB_TCPMD5FAILURE
149 SKB_DROP_REASON_TCP_MD5FAILURE,
151 * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog (
152 * see LINUX_MIB_TCPBACKLOGDROP)
154 SKB_DROP_REASON_SOCKET_BACKLOG,
155 /** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */
156 SKB_DROP_REASON_TCP_FLAGS,
158 * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero,
159 * see LINUX_MIB_TCPZEROWINDOWDROP
161 SKB_DROP_REASON_TCP_ZEROWINDOW,
163 * @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data reveived is already
164 * received before (spurious retrans may happened), see
165 * LINUX_MIB_DELAYEDACKLOST
167 SKB_DROP_REASON_TCP_OLD_DATA,
169 * @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window,
170 * the seq of the first byte exceed the right edges of receive
173 SKB_DROP_REASON_TCP_OVERWINDOW,
175 * @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo
176 * queue, corresponding to LINUX_MIB_TCPOFOMERGE
178 SKB_DROP_REASON_TCP_OFOMERGE,
180 * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to
181 * LINUX_MIB_PAWSESTABREJECTED
183 SKB_DROP_REASON_TCP_RFC7323_PAWS,
184 /** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */
185 SKB_DROP_REASON_TCP_INVALID_SEQUENCE,
186 /** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */
187 SKB_DROP_REASON_TCP_RESET,
189 * @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected
192 SKB_DROP_REASON_TCP_INVALID_SYN,
193 /** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */
194 SKB_DROP_REASON_TCP_CLOSE,
195 /** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */
196 SKB_DROP_REASON_TCP_FASTOPEN,
197 /** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */
198 SKB_DROP_REASON_TCP_OLD_ACK,
199 /** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */
200 SKB_DROP_REASON_TCP_TOO_OLD_ACK,
202 * @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't
205 SKB_DROP_REASON_TCP_ACK_UNSENT_DATA,
206 /** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */
207 SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE,
208 /** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */
209 SKB_DROP_REASON_TCP_OFO_DROP,
210 /** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */
211 SKB_DROP_REASON_IP_OUTNOROUTES,
213 * @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB
216 SKB_DROP_REASON_BPF_CGROUP_EGRESS,
217 /** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */
218 SKB_DROP_REASON_IPV6DISABLED,
219 /** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */
220 SKB_DROP_REASON_NEIGH_CREATEFAIL,
221 /** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */
222 SKB_DROP_REASON_NEIGH_FAILED,
223 /** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */
224 SKB_DROP_REASON_NEIGH_QUEUEFULL,
225 /** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */
226 SKB_DROP_REASON_NEIGH_DEAD,
227 /** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */
228 SKB_DROP_REASON_TC_EGRESS,
230 * @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting (
231 * failed to enqueue to current qdisc)
233 SKB_DROP_REASON_QDISC_DROP,
235 * @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU
236 * backlog queue. This can be caused by backlog queue full (see
237 * netdev_max_backlog in net.rst) or RPS flow limit
239 SKB_DROP_REASON_CPU_BACKLOG,
240 /** @SKB_DROP_REASON_XDP: dropped by XDP in input path */
242 /** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */
243 SKB_DROP_REASON_TC_INGRESS,
244 /** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */
245 SKB_DROP_REASON_UNHANDLED_PROTO,
246 /** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */
247 SKB_DROP_REASON_SKB_CSUM,
248 /** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */
249 SKB_DROP_REASON_SKB_GSO_SEG,
251 * @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space,
252 * e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx()
254 SKB_DROP_REASON_SKB_UCOPY_FAULT,
255 /** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */
256 SKB_DROP_REASON_DEV_HDR,
258 * @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to
259 * any of its data structure that is not up/ready/initialized,
260 * e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq]
263 SKB_DROP_REASON_DEV_READY,
264 /** @SKB_DROP_REASON_FULL_RING: ring buffer is full */
265 SKB_DROP_REASON_FULL_RING,
266 /** @SKB_DROP_REASON_NOMEM: error due to OOM */
267 SKB_DROP_REASON_NOMEM,
269 * @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from
270 * networking data, e.g., failed to pull the protocol header from
271 * frags via pskb_may_pull()
273 SKB_DROP_REASON_HDR_TRUNC,
275 * @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached
276 * to tun/tap, e.g., via TUNSETFILTEREBPF
278 SKB_DROP_REASON_TAP_FILTER,
280 * @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at
281 * tun/tap, e.g., check_filter()
283 SKB_DROP_REASON_TAP_TXFILTER,
284 /** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */
285 SKB_DROP_REASON_ICMP_CSUM,
287 * @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211,
288 * such as a broadcasts ICMP_TIMESTAMP
290 SKB_DROP_REASON_INVALID_PROTO,
292 * @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to
293 * IPSTATS_MIB_INADDRERRORS
295 SKB_DROP_REASON_IP_INADDRERRORS,
297 * @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to
298 * IPSTATS_MIB_INADDRERRORS
300 SKB_DROP_REASON_IP_INNOROUTES,
302 * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the
305 SKB_DROP_REASON_PKT_TOO_BIG,
306 /** @SKB_DROP_REASON_DUP_FRAG: duplicate fragment */
307 SKB_DROP_REASON_DUP_FRAG,
308 /** @SKB_DROP_REASON_FRAG_REASM_TIMEOUT: fragment reassembly timeout */
309 SKB_DROP_REASON_FRAG_REASM_TIMEOUT,
311 * @SKB_DROP_REASON_FRAG_TOO_FAR: ipv4 fragment too far.
312 * (/proc/sys/net/ipv4/ipfrag_max_dist)
314 SKB_DROP_REASON_FRAG_TOO_FAR,
316 * @SKB_DROP_REASON_MAX: the maximum of drop reason, which shouldn't be
317 * used as a real 'reason'
322 #define SKB_DR_INIT(name, reason) \
323 enum skb_drop_reason name = SKB_DROP_REASON_##reason
324 #define SKB_DR(name) \
325 SKB_DR_INIT(name, NOT_SPECIFIED)
326 #define SKB_DR_SET(name, reason) \
327 (name = SKB_DROP_REASON_##reason)
328 #define SKB_DR_OR(name, reason) \
330 if (name == SKB_DROP_REASON_NOT_SPECIFIED || \
331 name == SKB_NOT_DROPPED_YET) \
332 SKB_DR_SET(name, reason); \
335 extern const char * const drop_reasons[];