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) \
74 * enum skb_drop_reason - the reasons of skb drops
76 * The reason of skb drop, which is used in kfree_skb_reason().
78 enum skb_drop_reason {
80 * @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case)
82 SKB_NOT_DROPPED_YET = 0,
83 /** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */
84 SKB_DROP_REASON_NOT_SPECIFIED,
85 /** @SKB_DROP_REASON_NO_SOCKET: socket not found */
86 SKB_DROP_REASON_NO_SOCKET,
87 /** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */
88 SKB_DROP_REASON_PKT_TOO_SMALL,
89 /** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */
90 SKB_DROP_REASON_TCP_CSUM,
91 /** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */
92 SKB_DROP_REASON_SOCKET_FILTER,
93 /** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */
94 SKB_DROP_REASON_UDP_CSUM,
95 /** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */
96 SKB_DROP_REASON_NETFILTER_DROP,
98 * @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host
99 * (interface is in promisc mode)
101 SKB_DROP_REASON_OTHERHOST,
102 /** @SKB_DROP_REASON_IP_CSUM: IP checksum error */
103 SKB_DROP_REASON_IP_CSUM,
105 * @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see
106 * IPSTATS_MIB_INHDRERRORS)
108 SKB_DROP_REASON_IP_INHDR,
110 * @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the
111 * document for rp_filter in ip-sysctl.rst for more information
113 SKB_DROP_REASON_IP_RPFILTER,
115 * @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is
116 * multicast, but L3 is unicast.
118 SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST,
119 /** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */
120 SKB_DROP_REASON_XFRM_POLICY,
121 /** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */
122 SKB_DROP_REASON_IP_NOPROTO,
123 /** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */
124 SKB_DROP_REASON_SOCKET_RCVBUFF,
126 * @SKB_DROP_REASON_PROTO_MEM: proto memory limition, such as udp packet
127 * drop out of udp_memory_allocated.
129 SKB_DROP_REASON_PROTO_MEM,
131 * @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected,
132 * corresponding to LINUX_MIB_TCPMD5NOTFOUND
134 SKB_DROP_REASON_TCP_MD5NOTFOUND,
136 * @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting
137 * one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED
139 SKB_DROP_REASON_TCP_MD5UNEXPECTED,
141 * @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding
142 * to LINUX_MIB_TCPMD5FAILURE
144 SKB_DROP_REASON_TCP_MD5FAILURE,
146 * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog (
147 * see LINUX_MIB_TCPBACKLOGDROP)
149 SKB_DROP_REASON_SOCKET_BACKLOG,
150 /** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */
151 SKB_DROP_REASON_TCP_FLAGS,
153 * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero,
154 * see LINUX_MIB_TCPZEROWINDOWDROP
156 SKB_DROP_REASON_TCP_ZEROWINDOW,
158 * @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data reveived is already
159 * received before (spurious retrans may happened), see
160 * LINUX_MIB_DELAYEDACKLOST
162 SKB_DROP_REASON_TCP_OLD_DATA,
164 * @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window,
165 * the seq of the first byte exceed the right edges of receive
168 SKB_DROP_REASON_TCP_OVERWINDOW,
170 * @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo
171 * queue, corresponding to LINUX_MIB_TCPOFOMERGE
173 SKB_DROP_REASON_TCP_OFOMERGE,
175 * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to
176 * LINUX_MIB_PAWSESTABREJECTED
178 SKB_DROP_REASON_TCP_RFC7323_PAWS,
179 /** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */
180 SKB_DROP_REASON_TCP_INVALID_SEQUENCE,
181 /** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */
182 SKB_DROP_REASON_TCP_RESET,
184 * @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected
187 SKB_DROP_REASON_TCP_INVALID_SYN,
188 /** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */
189 SKB_DROP_REASON_TCP_CLOSE,
190 /** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */
191 SKB_DROP_REASON_TCP_FASTOPEN,
192 /** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */
193 SKB_DROP_REASON_TCP_OLD_ACK,
194 /** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */
195 SKB_DROP_REASON_TCP_TOO_OLD_ACK,
197 * @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't
200 SKB_DROP_REASON_TCP_ACK_UNSENT_DATA,
201 /** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */
202 SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE,
203 /** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */
204 SKB_DROP_REASON_TCP_OFO_DROP,
205 /** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */
206 SKB_DROP_REASON_IP_OUTNOROUTES,
208 * @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB
211 SKB_DROP_REASON_BPF_CGROUP_EGRESS,
212 /** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */
213 SKB_DROP_REASON_IPV6DISABLED,
214 /** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */
215 SKB_DROP_REASON_NEIGH_CREATEFAIL,
216 /** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */
217 SKB_DROP_REASON_NEIGH_FAILED,
218 /** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */
219 SKB_DROP_REASON_NEIGH_QUEUEFULL,
220 /** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */
221 SKB_DROP_REASON_NEIGH_DEAD,
222 /** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */
223 SKB_DROP_REASON_TC_EGRESS,
225 * @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting (
226 * failed to enqueue to current qdisc)
228 SKB_DROP_REASON_QDISC_DROP,
230 * @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU
231 * backlog queue. This can be caused by backlog queue full (see
232 * netdev_max_backlog in net.rst) or RPS flow limit
234 SKB_DROP_REASON_CPU_BACKLOG,
235 /** @SKB_DROP_REASON_XDP: dropped by XDP in input path */
237 /** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */
238 SKB_DROP_REASON_TC_INGRESS,
239 /** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */
240 SKB_DROP_REASON_UNHANDLED_PROTO,
241 /** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */
242 SKB_DROP_REASON_SKB_CSUM,
243 /** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */
244 SKB_DROP_REASON_SKB_GSO_SEG,
246 * @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space,
247 * e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx()
249 SKB_DROP_REASON_SKB_UCOPY_FAULT,
250 /** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */
251 SKB_DROP_REASON_DEV_HDR,
253 * @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to
254 * any of its data structure that is not up/ready/initialized,
255 * e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq]
258 SKB_DROP_REASON_DEV_READY,
259 /** @SKB_DROP_REASON_FULL_RING: ring buffer is full */
260 SKB_DROP_REASON_FULL_RING,
261 /** @SKB_DROP_REASON_NOMEM: error due to OOM */
262 SKB_DROP_REASON_NOMEM,
264 * @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from
265 * networking data, e.g., failed to pull the protocol header from
266 * frags via pskb_may_pull()
268 SKB_DROP_REASON_HDR_TRUNC,
270 * @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached
271 * to tun/tap, e.g., via TUNSETFILTEREBPF
273 SKB_DROP_REASON_TAP_FILTER,
275 * @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at
276 * tun/tap, e.g., check_filter()
278 SKB_DROP_REASON_TAP_TXFILTER,
279 /** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */
280 SKB_DROP_REASON_ICMP_CSUM,
282 * @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211,
283 * such as a broadcasts ICMP_TIMESTAMP
285 SKB_DROP_REASON_INVALID_PROTO,
287 * @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to
288 * IPSTATS_MIB_INADDRERRORS
290 SKB_DROP_REASON_IP_INADDRERRORS,
292 * @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to
293 * IPSTATS_MIB_INADDRERRORS
295 SKB_DROP_REASON_IP_INNOROUTES,
297 * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the
300 SKB_DROP_REASON_PKT_TOO_BIG,
302 * @SKB_DROP_REASON_MAX: the maximum of drop reason, which shouldn't be
303 * used as a real 'reason'
308 #define SKB_DR_INIT(name, reason) \
309 enum skb_drop_reason name = SKB_DROP_REASON_##reason
310 #define SKB_DR(name) \
311 SKB_DR_INIT(name, NOT_SPECIFIED)
312 #define SKB_DR_SET(name, reason) \
313 (name = SKB_DROP_REASON_##reason)
314 #define SKB_DR_OR(name, reason) \
316 if (name == SKB_DROP_REASON_NOT_SPECIFIED || \
317 name == SKB_NOT_DROPPED_YET) \
318 SKB_DR_SET(name, reason); \
321 extern const char * const drop_reasons[];