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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_AUTH_HDR) \
24 FN(TCP_MD5NOTFOUND) \
25 FN(TCP_MD5UNEXPECTED) \
26 FN(TCP_MD5FAILURE) \
27 FN(TCP_AONOTFOUND) \
28 FN(TCP_AOUNEXPECTED) \
29 FN(TCP_AOKEYNOTFOUND) \
30 FN(TCP_AOFAILURE) \
31 FN(SOCKET_BACKLOG) \
32 FN(TCP_FLAGS) \
33 FN(TCP_ZEROWINDOW) \
34 FN(TCP_OLD_DATA) \
35 FN(TCP_OVERWINDOW) \
36 FN(TCP_OFOMERGE) \
37 FN(TCP_RFC7323_PAWS) \
38 FN(TCP_OLD_SEQUENCE) \
39 FN(TCP_INVALID_SEQUENCE) \
40 FN(TCP_RESET) \
41 FN(TCP_INVALID_SYN) \
42 FN(TCP_CLOSE) \
43 FN(TCP_FASTOPEN) \
44 FN(TCP_OLD_ACK) \
45 FN(TCP_TOO_OLD_ACK) \
46 FN(TCP_ACK_UNSENT_DATA) \
47 FN(TCP_OFO_QUEUE_PRUNE) \
48 FN(TCP_OFO_DROP) \
49 FN(IP_OUTNOROUTES) \
50 FN(BPF_CGROUP_EGRESS) \
51 FN(IPV6DISABLED) \
52 FN(NEIGH_CREATEFAIL) \
53 FN(NEIGH_FAILED) \
54 FN(NEIGH_QUEUEFULL) \
55 FN(NEIGH_DEAD) \
56 FN(TC_EGRESS) \
57 FN(QDISC_DROP) \
58 FN(CPU_BACKLOG) \
59 FN(XDP) \
60 FN(TC_INGRESS) \
61 FN(UNHANDLED_PROTO) \
62 FN(SKB_CSUM) \
63 FN(SKB_GSO_SEG) \
64 FN(SKB_UCOPY_FAULT) \
65 FN(DEV_HDR) \
66 FN(DEV_READY) \
67 FN(FULL_RING) \
68 FN(NOMEM) \
69 FN(HDR_TRUNC) \
70 FN(TAP_FILTER) \
71 FN(TAP_TXFILTER) \
72 FN(ICMP_CSUM) \
73 FN(INVALID_PROTO) \
74 FN(IP_INADDRERRORS) \
75 FN(IP_INNOROUTES) \
76 FN(PKT_TOO_BIG) \
77 FN(DUP_FRAG) \
78 FN(FRAG_REASM_TIMEOUT) \
79 FN(FRAG_TOO_FAR) \
80 FN(TCP_MINTTL) \
81 FN(IPV6_BAD_EXTHDR) \
82 FN(IPV6_NDISC_FRAG) \
83 FN(IPV6_NDISC_HOP_LIMIT) \
84 FN(IPV6_NDISC_BAD_CODE) \
85 FN(IPV6_NDISC_BAD_OPTIONS) \
86 FN(IPV6_NDISC_NS_OTHERHOST) \
87 FN(QUEUE_PURGE) \
88 FN(TC_COOKIE_ERROR) \
89 FN(PACKET_SOCK_ERROR) \
90 FN(TC_CHAIN_NOTFOUND) \
91 FN(TC_RECLASSIFY_LOOP) \
92 FNe(MAX)
93
94/**
95 * enum skb_drop_reason - the reasons of skb drops
96 *
97 * The reason of skb drop, which is used in kfree_skb_reason().
98 */
99enum skb_drop_reason {
100 /**
101 * @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case)
102 */
103 SKB_NOT_DROPPED_YET = 0,
104 /** @SKB_CONSUMED: packet has been consumed */
105 SKB_CONSUMED,
106 /** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */
107 SKB_DROP_REASON_NOT_SPECIFIED,
108 /** @SKB_DROP_REASON_NO_SOCKET: socket not found */
109 SKB_DROP_REASON_NO_SOCKET,
110 /** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */
111 SKB_DROP_REASON_PKT_TOO_SMALL,
112 /** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */
113 SKB_DROP_REASON_TCP_CSUM,
114 /** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */
115 SKB_DROP_REASON_SOCKET_FILTER,
116 /** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */
117 SKB_DROP_REASON_UDP_CSUM,
118 /** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */
119 SKB_DROP_REASON_NETFILTER_DROP,
120 /**
121 * @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host
122 * (interface is in promisc mode)
123 */
124 SKB_DROP_REASON_OTHERHOST,
125 /** @SKB_DROP_REASON_IP_CSUM: IP checksum error */
126 SKB_DROP_REASON_IP_CSUM,
127 /**
128 * @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see
129 * IPSTATS_MIB_INHDRERRORS)
130 */
131 SKB_DROP_REASON_IP_INHDR,
132 /**
133 * @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the
134 * document for rp_filter in ip-sysctl.rst for more information
135 */
136 SKB_DROP_REASON_IP_RPFILTER,
137 /**
138 * @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is
139 * multicast, but L3 is unicast.
140 */
141 SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST,
142 /** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */
143 SKB_DROP_REASON_XFRM_POLICY,
144 /** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */
145 SKB_DROP_REASON_IP_NOPROTO,
146 /** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */
147 SKB_DROP_REASON_SOCKET_RCVBUFF,
148 /**
149 * @SKB_DROP_REASON_PROTO_MEM: proto memory limition, such as udp packet
150 * drop out of udp_memory_allocated.
151 */
152 SKB_DROP_REASON_PROTO_MEM,
153 /**
154 * @SKB_DROP_REASON_TCP_AUTH_HDR: TCP-MD5 or TCP-AO hashes are met
155 * twice or set incorrectly.
156 */
157 SKB_DROP_REASON_TCP_AUTH_HDR,
158 /**
159 * @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected,
160 * corresponding to LINUX_MIB_TCPMD5NOTFOUND
161 */
162 SKB_DROP_REASON_TCP_MD5NOTFOUND,
163 /**
164 * @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting
165 * one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED
166 */
167 SKB_DROP_REASON_TCP_MD5UNEXPECTED,
168 /**
169 * @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding
170 * to LINUX_MIB_TCPMD5FAILURE
171 */
172 SKB_DROP_REASON_TCP_MD5FAILURE,
173 /**
174 * @SKB_DROP_REASON_TCP_AONOTFOUND: no TCP-AO hash and one was expected,
175 * corresponding to LINUX_MIB_TCPAOREQUIRED
176 */
177 SKB_DROP_REASON_TCP_AONOTFOUND,
178 /**
179 * @SKB_DROP_REASON_TCP_AOUNEXPECTED: TCP-AO hash is present and it
180 * was not expected, corresponding to LINUX_MIB_TCPAOKEYNOTFOUND
181 */
182 SKB_DROP_REASON_TCP_AOUNEXPECTED,
183 /**
184 * @SKB_DROP_REASON_TCP_AOKEYNOTFOUND: TCP-AO key is unknown,
185 * corresponding to LINUX_MIB_TCPAOKEYNOTFOUND
186 */
187 SKB_DROP_REASON_TCP_AOKEYNOTFOUND,
188 /**
189 * @SKB_DROP_REASON_TCP_AOFAILURE: TCP-AO hash is wrong,
190 * corresponding to LINUX_MIB_TCPAOBAD
191 */
192 SKB_DROP_REASON_TCP_AOFAILURE,
193 /**
194 * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog (
195 * see LINUX_MIB_TCPBACKLOGDROP)
196 */
197 SKB_DROP_REASON_SOCKET_BACKLOG,
198 /** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */
199 SKB_DROP_REASON_TCP_FLAGS,
200 /**
201 * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero,
202 * see LINUX_MIB_TCPZEROWINDOWDROP
203 */
204 SKB_DROP_REASON_TCP_ZEROWINDOW,
205 /**
206 * @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data reveived is already
207 * received before (spurious retrans may happened), see
208 * LINUX_MIB_DELAYEDACKLOST
209 */
210 SKB_DROP_REASON_TCP_OLD_DATA,
211 /**
212 * @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window,
213 * the seq of the first byte exceed the right edges of receive
214 * window
215 */
216 SKB_DROP_REASON_TCP_OVERWINDOW,
217 /**
218 * @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo
219 * queue, corresponding to LINUX_MIB_TCPOFOMERGE
220 */
221 SKB_DROP_REASON_TCP_OFOMERGE,
222 /**
223 * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to
224 * LINUX_MIB_PAWSESTABREJECTED
225 */
226 SKB_DROP_REASON_TCP_RFC7323_PAWS,
227 /** @SKB_DROP_REASON_TCP_OLD_SEQUENCE: Old SEQ field (duplicate packet) */
228 SKB_DROP_REASON_TCP_OLD_SEQUENCE,
229 /** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */
230 SKB_DROP_REASON_TCP_INVALID_SEQUENCE,
231 /** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */
232 SKB_DROP_REASON_TCP_RESET,
233 /**
234 * @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected
235 * SYN flag
236 */
237 SKB_DROP_REASON_TCP_INVALID_SYN,
238 /** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */
239 SKB_DROP_REASON_TCP_CLOSE,
240 /** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */
241 SKB_DROP_REASON_TCP_FASTOPEN,
242 /** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */
243 SKB_DROP_REASON_TCP_OLD_ACK,
244 /** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */
245 SKB_DROP_REASON_TCP_TOO_OLD_ACK,
246 /**
247 * @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't
248 * sent yet
249 */
250 SKB_DROP_REASON_TCP_ACK_UNSENT_DATA,
251 /** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */
252 SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE,
253 /** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */
254 SKB_DROP_REASON_TCP_OFO_DROP,
255 /** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */
256 SKB_DROP_REASON_IP_OUTNOROUTES,
257 /**
258 * @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB
259 * eBPF program
260 */
261 SKB_DROP_REASON_BPF_CGROUP_EGRESS,
262 /** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */
263 SKB_DROP_REASON_IPV6DISABLED,
264 /** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */
265 SKB_DROP_REASON_NEIGH_CREATEFAIL,
266 /** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */
267 SKB_DROP_REASON_NEIGH_FAILED,
268 /** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */
269 SKB_DROP_REASON_NEIGH_QUEUEFULL,
270 /** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */
271 SKB_DROP_REASON_NEIGH_DEAD,
272 /** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */
273 SKB_DROP_REASON_TC_EGRESS,
274 /**
275 * @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting (
276 * failed to enqueue to current qdisc)
277 */
278 SKB_DROP_REASON_QDISC_DROP,
279 /**
280 * @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU
281 * backlog queue. This can be caused by backlog queue full (see
282 * netdev_max_backlog in net.rst) or RPS flow limit
283 */
284 SKB_DROP_REASON_CPU_BACKLOG,
285 /** @SKB_DROP_REASON_XDP: dropped by XDP in input path */
286 SKB_DROP_REASON_XDP,
287 /** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */
288 SKB_DROP_REASON_TC_INGRESS,
289 /** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */
290 SKB_DROP_REASON_UNHANDLED_PROTO,
291 /** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */
292 SKB_DROP_REASON_SKB_CSUM,
293 /** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */
294 SKB_DROP_REASON_SKB_GSO_SEG,
295 /**
296 * @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space,
297 * e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx()
298 */
299 SKB_DROP_REASON_SKB_UCOPY_FAULT,
300 /** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */
301 SKB_DROP_REASON_DEV_HDR,
302 /**
303 * @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to
304 * any of its data structure that is not up/ready/initialized,
305 * e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq]
306 * is not initialized
307 */
308 SKB_DROP_REASON_DEV_READY,
309 /** @SKB_DROP_REASON_FULL_RING: ring buffer is full */
310 SKB_DROP_REASON_FULL_RING,
311 /** @SKB_DROP_REASON_NOMEM: error due to OOM */
312 SKB_DROP_REASON_NOMEM,
313 /**
314 * @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from
315 * networking data, e.g., failed to pull the protocol header from
316 * frags via pskb_may_pull()
317 */
318 SKB_DROP_REASON_HDR_TRUNC,
319 /**
320 * @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached
321 * to tun/tap, e.g., via TUNSETFILTEREBPF
322 */
323 SKB_DROP_REASON_TAP_FILTER,
324 /**
325 * @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at
326 * tun/tap, e.g., check_filter()
327 */
328 SKB_DROP_REASON_TAP_TXFILTER,
329 /** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */
330 SKB_DROP_REASON_ICMP_CSUM,
331 /**
332 * @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211,
333 * such as a broadcasts ICMP_TIMESTAMP
334 */
335 SKB_DROP_REASON_INVALID_PROTO,
336 /**
337 * @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to
338 * IPSTATS_MIB_INADDRERRORS
339 */
340 SKB_DROP_REASON_IP_INADDRERRORS,
341 /**
342 * @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to
343 * IPSTATS_MIB_INADDRERRORS
344 */
345 SKB_DROP_REASON_IP_INNOROUTES,
346 /**
347 * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the
348 * MTU)
349 */
350 SKB_DROP_REASON_PKT_TOO_BIG,
351 /** @SKB_DROP_REASON_DUP_FRAG: duplicate fragment */
352 SKB_DROP_REASON_DUP_FRAG,
353 /** @SKB_DROP_REASON_FRAG_REASM_TIMEOUT: fragment reassembly timeout */
354 SKB_DROP_REASON_FRAG_REASM_TIMEOUT,
355 /**
356 * @SKB_DROP_REASON_FRAG_TOO_FAR: ipv4 fragment too far.
357 * (/proc/sys/net/ipv4/ipfrag_max_dist)
358 */
359 SKB_DROP_REASON_FRAG_TOO_FAR,
360 /**
361 * @SKB_DROP_REASON_TCP_MINTTL: ipv4 ttl or ipv6 hoplimit below
362 * the threshold (IP_MINTTL or IPV6_MINHOPCOUNT).
363 */
364 SKB_DROP_REASON_TCP_MINTTL,
365 /** @SKB_DROP_REASON_IPV6_BAD_EXTHDR: Bad IPv6 extension header. */
366 SKB_DROP_REASON_IPV6_BAD_EXTHDR,
367 /** @SKB_DROP_REASON_IPV6_NDISC_FRAG: invalid frag (suppress_frag_ndisc). */
368 SKB_DROP_REASON_IPV6_NDISC_FRAG,
369 /** @SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT: invalid hop limit. */
370 SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT,
371 /** @SKB_DROP_REASON_IPV6_NDISC_BAD_CODE: invalid NDISC icmp6 code. */
372 SKB_DROP_REASON_IPV6_NDISC_BAD_CODE,
373 /** @SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS: invalid NDISC options. */
374 SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS,
375 /**
376 * @SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST: NEIGHBOUR SOLICITATION
377 * for another host.
378 */
379 SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST,
380 /** @SKB_DROP_REASON_QUEUE_PURGE: bulk free. */
381 SKB_DROP_REASON_QUEUE_PURGE,
382 /**
383 * @SKB_DROP_REASON_TC_COOKIE_ERROR: An error occurred whilst
384 * processing a tc ext cookie.
385 */
386 SKB_DROP_REASON_TC_COOKIE_ERROR,
387 /**
388 * @SKB_DROP_REASON_PACKET_SOCK_ERROR: generic packet socket errors
389 * after its filter matches an incoming packet.
390 */
391 SKB_DROP_REASON_PACKET_SOCK_ERROR,
392 /** @SKB_DROP_REASON_TC_CHAIN_NOTFOUND: tc chain lookup failed. */
393 SKB_DROP_REASON_TC_CHAIN_NOTFOUND,
394 /**
395 * @SKB_DROP_REASON_TC_RECLASSIFY_LOOP: tc exceeded max reclassify loop
396 * iterations.
397 */
398 SKB_DROP_REASON_TC_RECLASSIFY_LOOP,
399 /**
400 * @SKB_DROP_REASON_MAX: the maximum of core drop reasons, which
401 * shouldn't be used as a real 'reason' - only for tracing code gen
402 */
403 SKB_DROP_REASON_MAX,
404
405 /**
406 * @SKB_DROP_REASON_SUBSYS_MASK: subsystem mask in drop reasons,
407 * see &enum skb_drop_reason_subsys
408 */
409 SKB_DROP_REASON_SUBSYS_MASK = 0xffff0000,
410};
411
412#define SKB_DROP_REASON_SUBSYS_SHIFT 16
413
414#define SKB_DR_INIT(name, reason) \
415 enum skb_drop_reason name = SKB_DROP_REASON_##reason
416#define SKB_DR(name) \
417 SKB_DR_INIT(name, NOT_SPECIFIED)
418#define SKB_DR_SET(name, reason) \
419 (name = SKB_DROP_REASON_##reason)
420#define SKB_DR_OR(name, reason) \
421 do { \
422 if (name == SKB_DROP_REASON_NOT_SPECIFIED || \
423 name == SKB_NOT_DROPPED_YET) \
424 SKB_DR_SET(name, reason); \
425 } while (0)
426
427#endif