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_ABORT_ON_DATA) \
34 FN(TCP_ZEROWINDOW) \
35 FN(TCP_OLD_DATA) \
36 FN(TCP_OVERWINDOW) \
37 FN(TCP_OFOMERGE) \
38 FN(TCP_RFC7323_PAWS) \
39 FN(TCP_OLD_SEQUENCE) \
40 FN(TCP_INVALID_SEQUENCE) \
41 FN(TCP_INVALID_ACK_SEQUENCE) \
42 FN(TCP_RESET) \
43 FN(TCP_INVALID_SYN) \
44 FN(TCP_CLOSE) \
45 FN(TCP_FASTOPEN) \
46 FN(TCP_OLD_ACK) \
47 FN(TCP_TOO_OLD_ACK) \
48 FN(TCP_ACK_UNSENT_DATA) \
49 FN(TCP_OFO_QUEUE_PRUNE) \
50 FN(TCP_OFO_DROP) \
51 FN(IP_OUTNOROUTES) \
52 FN(BPF_CGROUP_EGRESS) \
53 FN(IPV6DISABLED) \
54 FN(NEIGH_CREATEFAIL) \
55 FN(NEIGH_FAILED) \
56 FN(NEIGH_QUEUEFULL) \
57 FN(NEIGH_DEAD) \
58 FN(TC_EGRESS) \
59 FN(SECURITY_HOOK) \
60 FN(QDISC_DROP) \
61 FN(CPU_BACKLOG) \
62 FN(XDP) \
63 FN(TC_INGRESS) \
64 FN(UNHANDLED_PROTO) \
65 FN(SKB_CSUM) \
66 FN(SKB_GSO_SEG) \
67 FN(SKB_UCOPY_FAULT) \
68 FN(DEV_HDR) \
69 FN(DEV_READY) \
70 FN(FULL_RING) \
71 FN(NOMEM) \
72 FN(HDR_TRUNC) \
73 FN(TAP_FILTER) \
74 FN(TAP_TXFILTER) \
75 FN(ICMP_CSUM) \
76 FN(INVALID_PROTO) \
77 FN(IP_INADDRERRORS) \
78 FN(IP_INNOROUTES) \
79 FN(PKT_TOO_BIG) \
80 FN(DUP_FRAG) \
81 FN(FRAG_REASM_TIMEOUT) \
82 FN(FRAG_TOO_FAR) \
83 FN(TCP_MINTTL) \
84 FN(IPV6_BAD_EXTHDR) \
85 FN(IPV6_NDISC_FRAG) \
86 FN(IPV6_NDISC_HOP_LIMIT) \
87 FN(IPV6_NDISC_BAD_CODE) \
88 FN(IPV6_NDISC_BAD_OPTIONS) \
89 FN(IPV6_NDISC_NS_OTHERHOST) \
90 FN(QUEUE_PURGE) \
91 FN(TC_COOKIE_ERROR) \
92 FN(PACKET_SOCK_ERROR) \
93 FN(TC_CHAIN_NOTFOUND) \
94 FN(TC_RECLASSIFY_LOOP) \
95 FNe(MAX)
96
97 /**
98 * enum skb_drop_reason - the reasons of skb drops
99 *
100 * The reason of skb drop, which is used in kfree_skb_reason().
101 */
102 enum skb_drop_reason {
103 /**
104 * @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case)
105 */
106 SKB_NOT_DROPPED_YET = 0,
107 /** @SKB_CONSUMED: packet has been consumed */
108 SKB_CONSUMED,
109 /** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */
110 SKB_DROP_REASON_NOT_SPECIFIED,
111 /**
112 * @SKB_DROP_REASON_NO_SOCKET: no valid socket that can be used.
113 * Reason could be one of three cases:
114 * 1) no established/listening socket found during lookup process
115 * 2) no valid request socket during 3WHS process
116 * 3) no valid child socket during 3WHS process
117 */
118 SKB_DROP_REASON_NO_SOCKET,
119 /** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */
120 SKB_DROP_REASON_PKT_TOO_SMALL,
121 /** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */
122 SKB_DROP_REASON_TCP_CSUM,
123 /** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */
124 SKB_DROP_REASON_SOCKET_FILTER,
125 /** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */
126 SKB_DROP_REASON_UDP_CSUM,
127 /** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */
128 SKB_DROP_REASON_NETFILTER_DROP,
129 /**
130 * @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host
131 * (interface is in promisc mode)
132 */
133 SKB_DROP_REASON_OTHERHOST,
134 /** @SKB_DROP_REASON_IP_CSUM: IP checksum error */
135 SKB_DROP_REASON_IP_CSUM,
136 /**
137 * @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see
138 * IPSTATS_MIB_INHDRERRORS)
139 */
140 SKB_DROP_REASON_IP_INHDR,
141 /**
142 * @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the
143 * document for rp_filter in ip-sysctl.rst for more information
144 */
145 SKB_DROP_REASON_IP_RPFILTER,
146 /**
147 * @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is
148 * multicast, but L3 is unicast.
149 */
150 SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST,
151 /** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */
152 SKB_DROP_REASON_XFRM_POLICY,
153 /** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */
154 SKB_DROP_REASON_IP_NOPROTO,
155 /** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */
156 SKB_DROP_REASON_SOCKET_RCVBUFF,
157 /**
158 * @SKB_DROP_REASON_PROTO_MEM: proto memory limition, such as udp packet
159 * drop out of udp_memory_allocated.
160 */
161 SKB_DROP_REASON_PROTO_MEM,
162 /**
163 * @SKB_DROP_REASON_TCP_AUTH_HDR: TCP-MD5 or TCP-AO hashes are met
164 * twice or set incorrectly.
165 */
166 SKB_DROP_REASON_TCP_AUTH_HDR,
167 /**
168 * @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected,
169 * corresponding to LINUX_MIB_TCPMD5NOTFOUND
170 */
171 SKB_DROP_REASON_TCP_MD5NOTFOUND,
172 /**
173 * @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting
174 * one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED
175 */
176 SKB_DROP_REASON_TCP_MD5UNEXPECTED,
177 /**
178 * @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding
179 * to LINUX_MIB_TCPMD5FAILURE
180 */
181 SKB_DROP_REASON_TCP_MD5FAILURE,
182 /**
183 * @SKB_DROP_REASON_TCP_AONOTFOUND: no TCP-AO hash and one was expected,
184 * corresponding to LINUX_MIB_TCPAOREQUIRED
185 */
186 SKB_DROP_REASON_TCP_AONOTFOUND,
187 /**
188 * @SKB_DROP_REASON_TCP_AOUNEXPECTED: TCP-AO hash is present and it
189 * was not expected, corresponding to LINUX_MIB_TCPAOKEYNOTFOUND
190 */
191 SKB_DROP_REASON_TCP_AOUNEXPECTED,
192 /**
193 * @SKB_DROP_REASON_TCP_AOKEYNOTFOUND: TCP-AO key is unknown,
194 * corresponding to LINUX_MIB_TCPAOKEYNOTFOUND
195 */
196 SKB_DROP_REASON_TCP_AOKEYNOTFOUND,
197 /**
198 * @SKB_DROP_REASON_TCP_AOFAILURE: TCP-AO hash is wrong,
199 * corresponding to LINUX_MIB_TCPAOBAD
200 */
201 SKB_DROP_REASON_TCP_AOFAILURE,
202 /**
203 * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog (
204 * see LINUX_MIB_TCPBACKLOGDROP)
205 */
206 SKB_DROP_REASON_SOCKET_BACKLOG,
207 /** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */
208 SKB_DROP_REASON_TCP_FLAGS,
209 /**
210 * @SKB_DROP_REASON_TCP_ABORT_ON_DATA: abort on data, corresponding to
211 * LINUX_MIB_TCPABORTONDATA
212 */
213 SKB_DROP_REASON_TCP_ABORT_ON_DATA,
214 /**
215 * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero,
216 * see LINUX_MIB_TCPZEROWINDOWDROP
217 */
218 SKB_DROP_REASON_TCP_ZEROWINDOW,
219 /**
220 * @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data reveived is already
221 * received before (spurious retrans may happened), see
222 * LINUX_MIB_DELAYEDACKLOST
223 */
224 SKB_DROP_REASON_TCP_OLD_DATA,
225 /**
226 * @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window,
227 * the seq of the first byte exceed the right edges of receive
228 * window
229 */
230 SKB_DROP_REASON_TCP_OVERWINDOW,
231 /**
232 * @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo
233 * queue, corresponding to LINUX_MIB_TCPOFOMERGE
234 */
235 SKB_DROP_REASON_TCP_OFOMERGE,
236 /**
237 * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to
238 * LINUX_MIB_PAWSESTABREJECTED, LINUX_MIB_PAWSACTIVEREJECTED
239 */
240 SKB_DROP_REASON_TCP_RFC7323_PAWS,
241 /** @SKB_DROP_REASON_TCP_OLD_SEQUENCE: Old SEQ field (duplicate packet) */
242 SKB_DROP_REASON_TCP_OLD_SEQUENCE,
243 /** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */
244 SKB_DROP_REASON_TCP_INVALID_SEQUENCE,
245 /**
246 * @SKB_DROP_REASON_TCP_INVALID_ACK_SEQUENCE: Not acceptable ACK SEQ
247 * field because ack sequence is not in the window between snd_una
248 * and snd_nxt
249 */
250 SKB_DROP_REASON_TCP_INVALID_ACK_SEQUENCE,
251 /** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */
252 SKB_DROP_REASON_TCP_RESET,
253 /**
254 * @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected
255 * SYN flag
256 */
257 SKB_DROP_REASON_TCP_INVALID_SYN,
258 /** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */
259 SKB_DROP_REASON_TCP_CLOSE,
260 /** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */
261 SKB_DROP_REASON_TCP_FASTOPEN,
262 /** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */
263 SKB_DROP_REASON_TCP_OLD_ACK,
264 /** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */
265 SKB_DROP_REASON_TCP_TOO_OLD_ACK,
266 /**
267 * @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't
268 * sent yet
269 */
270 SKB_DROP_REASON_TCP_ACK_UNSENT_DATA,
271 /** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */
272 SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE,
273 /** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */
274 SKB_DROP_REASON_TCP_OFO_DROP,
275 /** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */
276 SKB_DROP_REASON_IP_OUTNOROUTES,
277 /**
278 * @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB
279 * eBPF program
280 */
281 SKB_DROP_REASON_BPF_CGROUP_EGRESS,
282 /** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */
283 SKB_DROP_REASON_IPV6DISABLED,
284 /** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */
285 SKB_DROP_REASON_NEIGH_CREATEFAIL,
286 /** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */
287 SKB_DROP_REASON_NEIGH_FAILED,
288 /** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */
289 SKB_DROP_REASON_NEIGH_QUEUEFULL,
290 /** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */
291 SKB_DROP_REASON_NEIGH_DEAD,
292 /** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */
293 SKB_DROP_REASON_TC_EGRESS,
294 /** @SKB_DROP_REASON_SECURITY_HOOK: dropped due to security HOOK */
295 SKB_DROP_REASON_SECURITY_HOOK,
296 /**
297 * @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting (
298 * failed to enqueue to current qdisc)
299 */
300 SKB_DROP_REASON_QDISC_DROP,
301 /**
302 * @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU
303 * backlog queue. This can be caused by backlog queue full (see
304 * netdev_max_backlog in net.rst) or RPS flow limit
305 */
306 SKB_DROP_REASON_CPU_BACKLOG,
307 /** @SKB_DROP_REASON_XDP: dropped by XDP in input path */
308 SKB_DROP_REASON_XDP,
309 /** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */
310 SKB_DROP_REASON_TC_INGRESS,
311 /** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */
312 SKB_DROP_REASON_UNHANDLED_PROTO,
313 /** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */
314 SKB_DROP_REASON_SKB_CSUM,
315 /** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */
316 SKB_DROP_REASON_SKB_GSO_SEG,
317 /**
318 * @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space,
319 * e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx()
320 */
321 SKB_DROP_REASON_SKB_UCOPY_FAULT,
322 /** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */
323 SKB_DROP_REASON_DEV_HDR,
324 /**
325 * @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to
326 * any of its data structure that is not up/ready/initialized,
327 * e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq]
328 * is not initialized
329 */
330 SKB_DROP_REASON_DEV_READY,
331 /** @SKB_DROP_REASON_FULL_RING: ring buffer is full */
332 SKB_DROP_REASON_FULL_RING,
333 /** @SKB_DROP_REASON_NOMEM: error due to OOM */
334 SKB_DROP_REASON_NOMEM,
335 /**
336 * @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from
337 * networking data, e.g., failed to pull the protocol header from
338 * frags via pskb_may_pull()
339 */
340 SKB_DROP_REASON_HDR_TRUNC,
341 /**
342 * @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached
343 * to tun/tap, e.g., via TUNSETFILTEREBPF
344 */
345 SKB_DROP_REASON_TAP_FILTER,
346 /**
347 * @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at
348 * tun/tap, e.g., check_filter()
349 */
350 SKB_DROP_REASON_TAP_TXFILTER,
351 /** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */
352 SKB_DROP_REASON_ICMP_CSUM,
353 /**
354 * @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211,
355 * such as a broadcasts ICMP_TIMESTAMP
356 */
357 SKB_DROP_REASON_INVALID_PROTO,
358 /**
359 * @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to
360 * IPSTATS_MIB_INADDRERRORS
361 */
362 SKB_DROP_REASON_IP_INADDRERRORS,
363 /**
364 * @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to
365 * IPSTATS_MIB_INADDRERRORS
366 */
367 SKB_DROP_REASON_IP_INNOROUTES,
368 /**
369 * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the
370 * MTU)
371 */
372 SKB_DROP_REASON_PKT_TOO_BIG,
373 /** @SKB_DROP_REASON_DUP_FRAG: duplicate fragment */
374 SKB_DROP_REASON_DUP_FRAG,
375 /** @SKB_DROP_REASON_FRAG_REASM_TIMEOUT: fragment reassembly timeout */
376 SKB_DROP_REASON_FRAG_REASM_TIMEOUT,
377 /**
378 * @SKB_DROP_REASON_FRAG_TOO_FAR: ipv4 fragment too far.
379 * (/proc/sys/net/ipv4/ipfrag_max_dist)
380 */
381 SKB_DROP_REASON_FRAG_TOO_FAR,
382 /**
383 * @SKB_DROP_REASON_TCP_MINTTL: ipv4 ttl or ipv6 hoplimit below
384 * the threshold (IP_MINTTL or IPV6_MINHOPCOUNT).
385 */
386 SKB_DROP_REASON_TCP_MINTTL,
387 /** @SKB_DROP_REASON_IPV6_BAD_EXTHDR: Bad IPv6 extension header. */
388 SKB_DROP_REASON_IPV6_BAD_EXTHDR,
389 /** @SKB_DROP_REASON_IPV6_NDISC_FRAG: invalid frag (suppress_frag_ndisc). */
390 SKB_DROP_REASON_IPV6_NDISC_FRAG,
391 /** @SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT: invalid hop limit. */
392 SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT,
393 /** @SKB_DROP_REASON_IPV6_NDISC_BAD_CODE: invalid NDISC icmp6 code. */
394 SKB_DROP_REASON_IPV6_NDISC_BAD_CODE,
395 /** @SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS: invalid NDISC options. */
396 SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS,
397 /**
398 * @SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST: NEIGHBOUR SOLICITATION
399 * for another host.
400 */
401 SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST,
402 /** @SKB_DROP_REASON_QUEUE_PURGE: bulk free. */
403 SKB_DROP_REASON_QUEUE_PURGE,
404 /**
405 * @SKB_DROP_REASON_TC_COOKIE_ERROR: An error occurred whilst
406 * processing a tc ext cookie.
407 */
408 SKB_DROP_REASON_TC_COOKIE_ERROR,
409 /**
410 * @SKB_DROP_REASON_PACKET_SOCK_ERROR: generic packet socket errors
411 * after its filter matches an incoming packet.
412 */
413 SKB_DROP_REASON_PACKET_SOCK_ERROR,
414 /** @SKB_DROP_REASON_TC_CHAIN_NOTFOUND: tc chain lookup failed. */
415 SKB_DROP_REASON_TC_CHAIN_NOTFOUND,
416 /**
417 * @SKB_DROP_REASON_TC_RECLASSIFY_LOOP: tc exceeded max reclassify loop
418 * iterations.
419 */
420 SKB_DROP_REASON_TC_RECLASSIFY_LOOP,
421 /**
422 * @SKB_DROP_REASON_MAX: the maximum of core drop reasons, which
423 * shouldn't be used as a real 'reason' - only for tracing code gen
424 */
425 SKB_DROP_REASON_MAX,
426
427 /**
428 * @SKB_DROP_REASON_SUBSYS_MASK: subsystem mask in drop reasons,
429 * see &enum skb_drop_reason_subsys
430 */
431 SKB_DROP_REASON_SUBSYS_MASK = 0xffff0000,
432 };
433
434 #define SKB_DROP_REASON_SUBSYS_SHIFT 16
435
436 #define SKB_DR_INIT(name, reason) \
437 enum skb_drop_reason name = SKB_DROP_REASON_##reason
438 #define SKB_DR(name) \
439 SKB_DR_INIT(name, NOT_SPECIFIED)
440 #define SKB_DR_SET(name, reason) \
441 (name = SKB_DROP_REASON_##reason)
442 #define SKB_DR_OR(name, reason) \
443 do { \
444 if (name == SKB_DROP_REASON_NOT_SPECIFIED || \
445 name == SKB_NOT_DROPPED_YET) \
446 SKB_DR_SET(name, reason); \
447 } while (0)
448
449 #endif
450
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.