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

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