1/* SPDX-License-Identifier: GPL-2.0-or-later */
2
3#ifndef _LINUX_DROPREASON_CORE_H
4#define _LINUX_DROPREASON_CORE_H
5
6#define DEFINE_DROP_REASON(FN, FNe) \
7 FN(NOT_SPECIFIED) \
8 FN(NO_SOCKET) \
9 FN(PKT_TOO_SMALL) \
10 FN(TCP_CSUM) \
11 FN(SOCKET_FILTER) \
12 FN(UDP_CSUM) \
13 FN(NETFILTER_DROP) \
14 FN(OTHERHOST) \
15 FN(IP_CSUM) \
16 FN(IP_INHDR) \
17 FN(IP_RPFILTER) \
18 FN(UNICAST_IN_L2_MULTICAST) \
19 FN(XFRM_POLICY) \
20 FN(IP_NOPROTO) \
21 FN(SOCKET_RCVBUFF) \
22 FN(PROTO_MEM) \
23 FN(TCP_MD5NOTFOUND) \
24 FN(TCP_MD5UNEXPECTED) \
25 FN(TCP_MD5FAILURE) \
26 FN(SOCKET_BACKLOG) \
27 FN(TCP_FLAGS) \
28 FN(TCP_ZEROWINDOW) \
29 FN(TCP_OLD_DATA) \
30 FN(TCP_OVERWINDOW) \
31 FN(TCP_OFOMERGE) \
32 FN(TCP_RFC7323_PAWS) \
33 FN(TCP_INVALID_SEQUENCE) \
34 FN(TCP_RESET) \
35 FN(TCP_INVALID_SYN) \
36 FN(TCP_CLOSE) \
37 FN(TCP_FASTOPEN) \
38 FN(TCP_OLD_ACK) \
39 FN(TCP_TOO_OLD_ACK) \
40 FN(TCP_ACK_UNSENT_DATA) \
41 FN(TCP_OFO_QUEUE_PRUNE) \
42 FN(TCP_OFO_DROP) \
43 FN(IP_OUTNOROUTES) \
44 FN(BPF_CGROUP_EGRESS) \
45 FN(IPV6DISABLED) \
46 FN(NEIGH_CREATEFAIL) \
47 FN(NEIGH_FAILED) \
48 FN(NEIGH_QUEUEFULL) \
49 FN(NEIGH_DEAD) \
50 FN(TC_EGRESS) \
51 FN(QDISC_DROP) \
52 FN(CPU_BACKLOG) \
53 FN(XDP) \
54 FN(TC_INGRESS) \
55 FN(UNHANDLED_PROTO) \
56 FN(SKB_CSUM) \
57 FN(SKB_GSO_SEG) \
58 FN(SKB_UCOPY_FAULT) \
59 FN(DEV_HDR) \
60 FN(DEV_READY) \
61 FN(FULL_RING) \
62 FN(NOMEM) \
63 FN(HDR_TRUNC) \
64 FN(TAP_FILTER) \
65 FN(TAP_TXFILTER) \
66 FN(ICMP_CSUM) \
67 FN(INVALID_PROTO) \
68 FN(IP_INADDRERRORS) \
69 FN(IP_INNOROUTES) \
70 FN(PKT_TOO_BIG) \
71 FN(DUP_FRAG) \
72 FN(FRAG_REASM_TIMEOUT) \
73 FN(FRAG_TOO_FAR) \
74 FN(TCP_MINTTL) \
75 FN(IPV6_BAD_EXTHDR) \
76 FN(IPV6_NDISC_FRAG) \
77 FN(IPV6_NDISC_HOP_LIMIT) \
78 FN(IPV6_NDISC_BAD_CODE) \
79 FN(IPV6_NDISC_BAD_OPTIONS) \
80 FN(IPV6_NDISC_NS_OTHERHOST) \
81 FNe(MAX)
82
83/**
84 * enum skb_drop_reason - the reasons of skb drops
85 *
86 * The reason of skb drop, which is used in kfree_skb_reason().
87 */
88enum skb_drop_reason {
89 /**
90 * @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case)
91 */
92 SKB_NOT_DROPPED_YET = 0,
93 /** @SKB_CONSUMED: packet has been consumed */
94 SKB_CONSUMED,
95 /** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */
96 SKB_DROP_REASON_NOT_SPECIFIED,
97 /** @SKB_DROP_REASON_NO_SOCKET: socket not found */
98 SKB_DROP_REASON_NO_SOCKET,
99 /** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */
100 SKB_DROP_REASON_PKT_TOO_SMALL,
101 /** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */
102 SKB_DROP_REASON_TCP_CSUM,
103 /** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */
104 SKB_DROP_REASON_SOCKET_FILTER,
105 /** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */
106 SKB_DROP_REASON_UDP_CSUM,
107 /** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */
108 SKB_DROP_REASON_NETFILTER_DROP,
109 /**
110 * @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host
111 * (interface is in promisc mode)
112 */
113 SKB_DROP_REASON_OTHERHOST,
114 /** @SKB_DROP_REASON_IP_CSUM: IP checksum error */
115 SKB_DROP_REASON_IP_CSUM,
116 /**
117 * @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see
118 * IPSTATS_MIB_INHDRERRORS)
119 */
120 SKB_DROP_REASON_IP_INHDR,
121 /**
122 * @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the
123 * document for rp_filter in ip-sysctl.rst for more information
124 */
125 SKB_DROP_REASON_IP_RPFILTER,
126 /**
127 * @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is
128 * multicast, but L3 is unicast.
129 */
130 SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST,
131 /** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */
132 SKB_DROP_REASON_XFRM_POLICY,
133 /** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */
134 SKB_DROP_REASON_IP_NOPROTO,
135 /** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */
136 SKB_DROP_REASON_SOCKET_RCVBUFF,
137 /**
138 * @SKB_DROP_REASON_PROTO_MEM: proto memory limition, such as udp packet
139 * drop out of udp_memory_allocated.
140 */
141 SKB_DROP_REASON_PROTO_MEM,
142 /**
143 * @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected,
144 * corresponding to LINUX_MIB_TCPMD5NOTFOUND
145 */
146 SKB_DROP_REASON_TCP_MD5NOTFOUND,
147 /**
148 * @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting
149 * one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED
150 */
151 SKB_DROP_REASON_TCP_MD5UNEXPECTED,
152 /**
153 * @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding
154 * to LINUX_MIB_TCPMD5FAILURE
155 */
156 SKB_DROP_REASON_TCP_MD5FAILURE,
157 /**
158 * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog (
159 * see LINUX_MIB_TCPBACKLOGDROP)
160 */
161 SKB_DROP_REASON_SOCKET_BACKLOG,
162 /** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */
163 SKB_DROP_REASON_TCP_FLAGS,
164 /**
165 * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero,
166 * see LINUX_MIB_TCPZEROWINDOWDROP
167 */
168 SKB_DROP_REASON_TCP_ZEROWINDOW,
169 /**
170 * @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data reveived is already
171 * received before (spurious retrans may happened), see
172 * LINUX_MIB_DELAYEDACKLOST
173 */
174 SKB_DROP_REASON_TCP_OLD_DATA,
175 /**
176 * @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window,
177 * the seq of the first byte exceed the right edges of receive
178 * window
179 */
180 SKB_DROP_REASON_TCP_OVERWINDOW,
181 /**
182 * @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo
183 * queue, corresponding to LINUX_MIB_TCPOFOMERGE
184 */
185 SKB_DROP_REASON_TCP_OFOMERGE,
186 /**
187 * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to
188 * LINUX_MIB_PAWSESTABREJECTED
189 */
190 SKB_DROP_REASON_TCP_RFC7323_PAWS,
191 /** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */
192 SKB_DROP_REASON_TCP_INVALID_SEQUENCE,
193 /** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */
194 SKB_DROP_REASON_TCP_RESET,
195 /**
196 * @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected
197 * SYN flag
198 */
199 SKB_DROP_REASON_TCP_INVALID_SYN,
200 /** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */
201 SKB_DROP_REASON_TCP_CLOSE,
202 /** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */
203 SKB_DROP_REASON_TCP_FASTOPEN,
204 /** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */
205 SKB_DROP_REASON_TCP_OLD_ACK,
206 /** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */
207 SKB_DROP_REASON_TCP_TOO_OLD_ACK,
208 /**
209 * @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't
210 * sent yet
211 */
212 SKB_DROP_REASON_TCP_ACK_UNSENT_DATA,
213 /** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */
214 SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE,
215 /** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */
216 SKB_DROP_REASON_TCP_OFO_DROP,
217 /** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */
218 SKB_DROP_REASON_IP_OUTNOROUTES,
219 /**
220 * @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB
221 * eBPF program
222 */
223 SKB_DROP_REASON_BPF_CGROUP_EGRESS,
224 /** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */
225 SKB_DROP_REASON_IPV6DISABLED,
226 /** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */
227 SKB_DROP_REASON_NEIGH_CREATEFAIL,
228 /** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */
229 SKB_DROP_REASON_NEIGH_FAILED,
230 /** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */
231 SKB_DROP_REASON_NEIGH_QUEUEFULL,
232 /** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */
233 SKB_DROP_REASON_NEIGH_DEAD,
234 /** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */
235 SKB_DROP_REASON_TC_EGRESS,
236 /**
237 * @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting (
238 * failed to enqueue to current qdisc)
239 */
240 SKB_DROP_REASON_QDISC_DROP,
241 /**
242 * @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU
243 * backlog queue. This can be caused by backlog queue full (see
244 * netdev_max_backlog in net.rst) or RPS flow limit
245 */
246 SKB_DROP_REASON_CPU_BACKLOG,
247 /** @SKB_DROP_REASON_XDP: dropped by XDP in input path */
248 SKB_DROP_REASON_XDP,
249 /** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */
250 SKB_DROP_REASON_TC_INGRESS,
251 /** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */
252 SKB_DROP_REASON_UNHANDLED_PROTO,
253 /** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */
254 SKB_DROP_REASON_SKB_CSUM,
255 /** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */
256 SKB_DROP_REASON_SKB_GSO_SEG,
257 /**
258 * @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space,
259 * e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx()
260 */
261 SKB_DROP_REASON_SKB_UCOPY_FAULT,
262 /** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */
263 SKB_DROP_REASON_DEV_HDR,
264 /**
265 * @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to
266 * any of its data structure that is not up/ready/initialized,
267 * e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq]
268 * is not initialized
269 */
270 SKB_DROP_REASON_DEV_READY,
271 /** @SKB_DROP_REASON_FULL_RING: ring buffer is full */
272 SKB_DROP_REASON_FULL_RING,
273 /** @SKB_DROP_REASON_NOMEM: error due to OOM */
274 SKB_DROP_REASON_NOMEM,
275 /**
276 * @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from
277 * networking data, e.g., failed to pull the protocol header from
278 * frags via pskb_may_pull()
279 */
280 SKB_DROP_REASON_HDR_TRUNC,
281 /**
282 * @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached
283 * to tun/tap, e.g., via TUNSETFILTEREBPF
284 */
285 SKB_DROP_REASON_TAP_FILTER,
286 /**
287 * @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at
288 * tun/tap, e.g., check_filter()
289 */
290 SKB_DROP_REASON_TAP_TXFILTER,
291 /** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */
292 SKB_DROP_REASON_ICMP_CSUM,
293 /**
294 * @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211,
295 * such as a broadcasts ICMP_TIMESTAMP
296 */
297 SKB_DROP_REASON_INVALID_PROTO,
298 /**
299 * @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to
300 * IPSTATS_MIB_INADDRERRORS
301 */
302 SKB_DROP_REASON_IP_INADDRERRORS,
303 /**
304 * @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to
305 * IPSTATS_MIB_INADDRERRORS
306 */
307 SKB_DROP_REASON_IP_INNOROUTES,
308 /**
309 * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the
310 * MTU)
311 */
312 SKB_DROP_REASON_PKT_TOO_BIG,
313 /** @SKB_DROP_REASON_DUP_FRAG: duplicate fragment */
314 SKB_DROP_REASON_DUP_FRAG,
315 /** @SKB_DROP_REASON_FRAG_REASM_TIMEOUT: fragment reassembly timeout */
316 SKB_DROP_REASON_FRAG_REASM_TIMEOUT,
317 /**
318 * @SKB_DROP_REASON_FRAG_TOO_FAR: ipv4 fragment too far.
319 * (/proc/sys/net/ipv4/ipfrag_max_dist)
320 */
321 SKB_DROP_REASON_FRAG_TOO_FAR,
322 /**
323 * @SKB_DROP_REASON_TCP_MINTTL: ipv4 ttl or ipv6 hoplimit below
324 * the threshold (IP_MINTTL or IPV6_MINHOPCOUNT).
325 */
326 SKB_DROP_REASON_TCP_MINTTL,
327 /** @SKB_DROP_REASON_IPV6_BAD_EXTHDR: Bad IPv6 extension header. */
328 SKB_DROP_REASON_IPV6_BAD_EXTHDR,
329 /** @SKB_DROP_REASON_IPV6_NDISC_FRAG: invalid frag (suppress_frag_ndisc). */
330 SKB_DROP_REASON_IPV6_NDISC_FRAG,
331 /** @SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT: invalid hop limit. */
332 SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT,
333 /** @SKB_DROP_REASON_IPV6_NDISC_BAD_CODE: invalid NDISC icmp6 code. */
334 SKB_DROP_REASON_IPV6_NDISC_BAD_CODE,
335 /** @SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS: invalid NDISC options. */
336 SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS,
337 /**
338 * @SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST: NEIGHBOUR SOLICITATION
339 * for another host.
340 */
341 SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST,
342 /**
343 * @SKB_DROP_REASON_MAX: the maximum of core drop reasons, which
344 * shouldn't be used as a real 'reason' - only for tracing code gen
345 */
346 SKB_DROP_REASON_MAX,
347
348 /**
349 * @SKB_DROP_REASON_SUBSYS_MASK: subsystem mask in drop reasons,
350 * see &enum skb_drop_reason_subsys
351 */
352 SKB_DROP_REASON_SUBSYS_MASK = 0xffff0000,
353};
354
355#define SKB_DROP_REASON_SUBSYS_SHIFT 16
356
357#define SKB_DR_INIT(name, reason) \
358 enum skb_drop_reason name = SKB_DROP_REASON_##reason
359#define SKB_DR(name) \
360 SKB_DR_INIT(name, NOT_SPECIFIED)
361#define SKB_DR_SET(name, reason) \
362 (name = SKB_DROP_REASON_##reason)
363#define SKB_DR_OR(name, reason) \
364 do { \
365 if (name == SKB_DROP_REASON_NOT_SPECIFIED || \
366 name == SKB_NOT_DROPPED_YET) \
367 SKB_DR_SET(name, reason); \
368 } while (0)
369
370#endif
371

source code of linux/include/net/dropreason-core.h