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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(SOCKET_CLOSE) \
10 FN(SOCKET_FILTER) \
11 FN(SOCKET_RCVBUFF) \
12 FN(UNIX_DISCONNECT) \
13 FN(UNIX_SKIP_OOB) \
14 FN(PKT_TOO_SMALL) \
15 FN(TCP_CSUM) \
16 FN(UDP_CSUM) \
17 FN(NETFILTER_DROP) \
18 FN(OTHERHOST) \
19 FN(IP_CSUM) \
20 FN(IP_INHDR) \
21 FN(IP_RPFILTER) \
22 FN(UNICAST_IN_L2_MULTICAST) \
23 FN(XFRM_POLICY) \
24 FN(IP_NOPROTO) \
25 FN(PROTO_MEM) \
26 FN(TCP_AUTH_HDR) \
27 FN(TCP_MD5NOTFOUND) \
28 FN(TCP_MD5UNEXPECTED) \
29 FN(TCP_MD5FAILURE) \
30 FN(TCP_AONOTFOUND) \
31 FN(TCP_AOUNEXPECTED) \
32 FN(TCP_AOKEYNOTFOUND) \
33 FN(TCP_AOFAILURE) \
34 FN(SOCKET_BACKLOG) \
35 FN(TCP_FLAGS) \
36 FN(TCP_ABORT_ON_DATA) \
37 FN(TCP_ZEROWINDOW) \
38 FN(TCP_OLD_DATA) \
39 FN(TCP_OVERWINDOW) \
40 FN(TCP_OFOMERGE) \
41 FN(TCP_RFC7323_PAWS) \
42 FN(TCP_RFC7323_PAWS_ACK) \
43 FN(TCP_RFC7323_TW_PAWS) \
44 FN(TCP_RFC7323_TSECR) \
45 FN(TCP_LISTEN_OVERFLOW) \
46 FN(TCP_OLD_SEQUENCE) \
47 FN(TCP_INVALID_SEQUENCE) \
48 FN(TCP_INVALID_END_SEQUENCE) \
49 FN(TCP_INVALID_ACK_SEQUENCE) \
50 FN(TCP_RESET) \
51 FN(TCP_INVALID_SYN) \
52 FN(TCP_CLOSE) \
53 FN(TCP_FASTOPEN) \
54 FN(TCP_OLD_ACK) \
55 FN(TCP_TOO_OLD_ACK) \
56 FN(TCP_ACK_UNSENT_DATA) \
57 FN(TCP_OFO_QUEUE_PRUNE) \
58 FN(TCP_OFO_DROP) \
59 FN(IP_OUTNOROUTES) \
60 FN(BPF_CGROUP_EGRESS) \
61 FN(IPV6DISABLED) \
62 FN(NEIGH_CREATEFAIL) \
63 FN(NEIGH_FAILED) \
64 FN(NEIGH_QUEUEFULL) \
65 FN(NEIGH_DEAD) \
66 FN(NEIGH_HH_FILLFAIL) \
67 FN(TC_EGRESS) \
68 FN(SECURITY_HOOK) \
69 FN(QDISC_DROP) \
70 FN(QDISC_BURST_DROP) \
71 FN(QDISC_OVERLIMIT) \
72 FN(QDISC_CONGESTED) \
73 FN(CAKE_FLOOD) \
74 FN(FQ_BAND_LIMIT) \
75 FN(FQ_HORIZON_LIMIT) \
76 FN(FQ_FLOW_LIMIT) \
77 FN(CPU_BACKLOG) \
78 FN(XDP) \
79 FN(TC_INGRESS) \
80 FN(UNHANDLED_PROTO) \
81 FN(SKB_CSUM) \
82 FN(SKB_GSO_SEG) \
83 FN(SKB_UCOPY_FAULT) \
84 FN(DEV_HDR) \
85 FN(DEV_READY) \
86 FN(FULL_RING) \
87 FN(NOMEM) \
88 FN(HDR_TRUNC) \
89 FN(TAP_FILTER) \
90 FN(TAP_TXFILTER) \
91 FN(ICMP_CSUM) \
92 FN(INVALID_PROTO) \
93 FN(IP_INADDRERRORS) \
94 FN(IP_INNOROUTES) \
95 FN(IP_LOCAL_SOURCE) \
96 FN(IP_INVALID_SOURCE) \
97 FN(IP_LOCALNET) \
98 FN(IP_INVALID_DEST) \
99 FN(PKT_TOO_BIG) \
100 FN(DUP_FRAG) \
101 FN(FRAG_REASM_TIMEOUT) \
102 FN(FRAG_TOO_FAR) \
103 FN(TCP_MINTTL) \
104 FN(IPV6_BAD_EXTHDR) \
105 FN(IPV6_NDISC_FRAG) \
106 FN(IPV6_NDISC_HOP_LIMIT) \
107 FN(IPV6_NDISC_BAD_CODE) \
108 FN(IPV6_NDISC_BAD_OPTIONS) \
109 FN(IPV6_NDISC_NS_OTHERHOST) \
110 FN(QUEUE_PURGE) \
111 FN(TC_COOKIE_ERROR) \
112 FN(PACKET_SOCK_ERROR) \
113 FN(TC_CHAIN_NOTFOUND) \
114 FN(TC_RECLASSIFY_LOOP) \
115 FN(VXLAN_INVALID_HDR) \
116 FN(VXLAN_VNI_NOT_FOUND) \
117 FN(MAC_INVALID_SOURCE) \
118 FN(VXLAN_ENTRY_EXISTS) \
119 FN(NO_TX_TARGET) \
120 FN(IP_TUNNEL_ECN) \
121 FN(TUNNEL_TXINFO) \
122 FN(LOCAL_MAC) \
123 FN(ARP_PVLAN_DISABLE) \
124 FN(MAC_IEEE_MAC_CONTROL) \
125 FN(BRIDGE_INGRESS_STP_STATE) \
126 FN(CAN_RX_INVALID_FRAME) \
127 FN(CANFD_RX_INVALID_FRAME) \
128 FN(CANXL_RX_INVALID_FRAME) \
129 FN(PFMEMALLOC) \
130 FN(DUALPI2_STEP_DROP) \
131 FN(PSP_INPUT) \
132 FN(PSP_OUTPUT) \
133 FNe(MAX)
134
135/**
136 * enum skb_drop_reason - the reasons of skb drops
137 *
138 * The reason of skb drop, which is used in kfree_skb_reason().
139 */
140enum skb_drop_reason {
141 /**
142 * @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case)
143 */
144 SKB_NOT_DROPPED_YET = 0,
145 /** @SKB_CONSUMED: packet has been consumed */
146 SKB_CONSUMED,
147 /** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */
148 SKB_DROP_REASON_NOT_SPECIFIED,
149 /**
150 * @SKB_DROP_REASON_NO_SOCKET: no valid socket that can be used.
151 * Reason could be one of three cases:
152 * 1) no established/listening socket found during lookup process
153 * 2) no valid request socket during 3WHS process
154 * 3) no valid child socket during 3WHS process
155 */
156 SKB_DROP_REASON_NO_SOCKET,
157 /** @SKB_DROP_REASON_SOCKET_CLOSE: socket is close()d */
158 SKB_DROP_REASON_SOCKET_CLOSE,
159 /** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */
160 SKB_DROP_REASON_SOCKET_FILTER,
161 /** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */
162 SKB_DROP_REASON_SOCKET_RCVBUFF,
163 /**
164 * @SKB_DROP_REASON_UNIX_DISCONNECT: recv queue is purged when SOCK_DGRAM
165 * or SOCK_SEQPACKET socket re-connect()s to another socket or notices
166 * during send() that the peer has been close()d.
167 */
168 SKB_DROP_REASON_UNIX_DISCONNECT,
169 /**
170 * @SKB_DROP_REASON_UNIX_SKIP_OOB: Out-Of-Band data is skipped by
171 * recv() without MSG_OOB so dropped.
172 */
173 SKB_DROP_REASON_UNIX_SKIP_OOB,
174 /** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */
175 SKB_DROP_REASON_PKT_TOO_SMALL,
176 /** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */
177 SKB_DROP_REASON_TCP_CSUM,
178 /** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */
179 SKB_DROP_REASON_UDP_CSUM,
180 /** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */
181 SKB_DROP_REASON_NETFILTER_DROP,
182 /**
183 * @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host
184 * (interface is in promisc mode)
185 */
186 SKB_DROP_REASON_OTHERHOST,
187 /** @SKB_DROP_REASON_IP_CSUM: IP checksum error */
188 SKB_DROP_REASON_IP_CSUM,
189 /**
190 * @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see
191 * IPSTATS_MIB_INHDRERRORS)
192 */
193 SKB_DROP_REASON_IP_INHDR,
194 /**
195 * @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the
196 * document for rp_filter in ip-sysctl.rst for more information
197 */
198 SKB_DROP_REASON_IP_RPFILTER,
199 /**
200 * @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is
201 * multicast, but L3 is unicast.
202 */
203 SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST,
204 /** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */
205 SKB_DROP_REASON_XFRM_POLICY,
206 /** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */
207 SKB_DROP_REASON_IP_NOPROTO,
208 /**
209 * @SKB_DROP_REASON_PROTO_MEM: proto memory limitation, such as
210 * udp packet drop out of udp_memory_allocated.
211 */
212 SKB_DROP_REASON_PROTO_MEM,
213 /**
214 * @SKB_DROP_REASON_TCP_AUTH_HDR: TCP-MD5 or TCP-AO hashes are met
215 * twice or set incorrectly.
216 */
217 SKB_DROP_REASON_TCP_AUTH_HDR,
218 /**
219 * @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected,
220 * corresponding to LINUX_MIB_TCPMD5NOTFOUND
221 */
222 SKB_DROP_REASON_TCP_MD5NOTFOUND,
223 /**
224 * @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting
225 * one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED
226 */
227 SKB_DROP_REASON_TCP_MD5UNEXPECTED,
228 /**
229 * @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding
230 * to LINUX_MIB_TCPMD5FAILURE
231 */
232 SKB_DROP_REASON_TCP_MD5FAILURE,
233 /**
234 * @SKB_DROP_REASON_TCP_AONOTFOUND: no TCP-AO hash and one was expected,
235 * corresponding to LINUX_MIB_TCPAOREQUIRED
236 */
237 SKB_DROP_REASON_TCP_AONOTFOUND,
238 /**
239 * @SKB_DROP_REASON_TCP_AOUNEXPECTED: TCP-AO hash is present and it
240 * was not expected, corresponding to LINUX_MIB_TCPAOKEYNOTFOUND
241 */
242 SKB_DROP_REASON_TCP_AOUNEXPECTED,
243 /**
244 * @SKB_DROP_REASON_TCP_AOKEYNOTFOUND: TCP-AO key is unknown,
245 * corresponding to LINUX_MIB_TCPAOKEYNOTFOUND
246 */
247 SKB_DROP_REASON_TCP_AOKEYNOTFOUND,
248 /**
249 * @SKB_DROP_REASON_TCP_AOFAILURE: TCP-AO hash is wrong,
250 * corresponding to LINUX_MIB_TCPAOBAD
251 */
252 SKB_DROP_REASON_TCP_AOFAILURE,
253 /**
254 * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog (
255 * see LINUX_MIB_TCPBACKLOGDROP)
256 */
257 SKB_DROP_REASON_SOCKET_BACKLOG,
258 /** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */
259 SKB_DROP_REASON_TCP_FLAGS,
260 /**
261 * @SKB_DROP_REASON_TCP_ABORT_ON_DATA: abort on data, corresponding to
262 * LINUX_MIB_TCPABORTONDATA
263 */
264 SKB_DROP_REASON_TCP_ABORT_ON_DATA,
265 /**
266 * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero,
267 * see LINUX_MIB_TCPZEROWINDOWDROP
268 */
269 SKB_DROP_REASON_TCP_ZEROWINDOW,
270 /**
271 * @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data received is already
272 * received before (spurious retrans may happened), see
273 * LINUX_MIB_DELAYEDACKLOST
274 */
275 SKB_DROP_REASON_TCP_OLD_DATA,
276 /**
277 * @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window,
278 * the seq of the first byte exceed the right edges of receive
279 * window
280 */
281 SKB_DROP_REASON_TCP_OVERWINDOW,
282 /**
283 * @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo
284 * queue, corresponding to LINUX_MIB_TCPOFOMERGE
285 */
286 SKB_DROP_REASON_TCP_OFOMERGE,
287 /**
288 * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to
289 * LINUX_MIB_PAWSESTABREJECTED, LINUX_MIB_PAWSACTIVEREJECTED
290 */
291 SKB_DROP_REASON_TCP_RFC7323_PAWS,
292 /**
293 * @SKB_DROP_REASON_TCP_RFC7323_PAWS_ACK: PAWS check, old ACK packet.
294 * Corresponds to LINUX_MIB_PAWS_OLD_ACK.
295 */
296 SKB_DROP_REASON_TCP_RFC7323_PAWS_ACK,
297 /**
298 * @SKB_DROP_REASON_TCP_RFC7323_TW_PAWS: PAWS check, socket is in
299 * TIME_WAIT state.
300 * Corresponds to LINUX_MIB_PAWS_TW_REJECTED.
301 */
302 SKB_DROP_REASON_TCP_RFC7323_TW_PAWS,
303 /**
304 * @SKB_DROP_REASON_TCP_RFC7323_TSECR: PAWS check, invalid TSEcr.
305 * Corresponds to LINUX_MIB_TSECRREJECTED.
306 */
307 SKB_DROP_REASON_TCP_RFC7323_TSECR,
308 /** @SKB_DROP_REASON_TCP_LISTEN_OVERFLOW: listener queue full. */
309 SKB_DROP_REASON_TCP_LISTEN_OVERFLOW,
310 /** @SKB_DROP_REASON_TCP_OLD_SEQUENCE: Old SEQ field (duplicate packet) */
311 SKB_DROP_REASON_TCP_OLD_SEQUENCE,
312 /** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field. */
313 SKB_DROP_REASON_TCP_INVALID_SEQUENCE,
314 /**
315 * @SKB_DROP_REASON_TCP_INVALID_END_SEQUENCE:
316 * Not acceptable END_SEQ field.
317 * Corresponds to LINUX_MIB_BEYOND_WINDOW.
318 */
319 SKB_DROP_REASON_TCP_INVALID_END_SEQUENCE,
320 /**
321 * @SKB_DROP_REASON_TCP_INVALID_ACK_SEQUENCE: Not acceptable ACK SEQ
322 * field because ack sequence is not in the window between snd_una
323 * and snd_nxt
324 */
325 SKB_DROP_REASON_TCP_INVALID_ACK_SEQUENCE,
326 /** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */
327 SKB_DROP_REASON_TCP_RESET,
328 /**
329 * @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected
330 * SYN flag
331 */
332 SKB_DROP_REASON_TCP_INVALID_SYN,
333 /** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */
334 SKB_DROP_REASON_TCP_CLOSE,
335 /** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */
336 SKB_DROP_REASON_TCP_FASTOPEN,
337 /** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */
338 SKB_DROP_REASON_TCP_OLD_ACK,
339 /** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */
340 SKB_DROP_REASON_TCP_TOO_OLD_ACK,
341 /**
342 * @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't
343 * sent yet
344 */
345 SKB_DROP_REASON_TCP_ACK_UNSENT_DATA,
346 /** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */
347 SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE,
348 /** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */
349 SKB_DROP_REASON_TCP_OFO_DROP,
350 /** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */
351 SKB_DROP_REASON_IP_OUTNOROUTES,
352 /**
353 * @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB
354 * eBPF program
355 */
356 SKB_DROP_REASON_BPF_CGROUP_EGRESS,
357 /** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */
358 SKB_DROP_REASON_IPV6DISABLED,
359 /** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */
360 SKB_DROP_REASON_NEIGH_CREATEFAIL,
361 /** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */
362 SKB_DROP_REASON_NEIGH_FAILED,
363 /** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */
364 SKB_DROP_REASON_NEIGH_QUEUEFULL,
365 /** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */
366 SKB_DROP_REASON_NEIGH_DEAD,
367 /** @SKB_DROP_REASON_NEIGH_HH_FILLFAIL: failed to fill the device hard header */
368 SKB_DROP_REASON_NEIGH_HH_FILLFAIL,
369 /** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */
370 SKB_DROP_REASON_TC_EGRESS,
371 /** @SKB_DROP_REASON_SECURITY_HOOK: dropped due to security HOOK */
372 SKB_DROP_REASON_SECURITY_HOOK,
373 /**
374 * @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting (
375 * failed to enqueue to current qdisc)
376 */
377 SKB_DROP_REASON_QDISC_DROP,
378 /**
379 * @SKB_DROP_REASON_QDISC_BURST_DROP: dropped when net.core.qdisc_max_burst
380 * limit is hit.
381 */
382 SKB_DROP_REASON_QDISC_BURST_DROP,
383 /**
384 * @SKB_DROP_REASON_QDISC_OVERLIMIT: dropped by qdisc when a qdisc
385 * instance exceeds its total buffer size limit.
386 */
387 SKB_DROP_REASON_QDISC_OVERLIMIT,
388 /**
389 * @SKB_DROP_REASON_QDISC_CONGESTED: dropped by a qdisc AQM algorithm
390 * due to congestion.
391 */
392 SKB_DROP_REASON_QDISC_CONGESTED,
393 /**
394 * @SKB_DROP_REASON_CAKE_FLOOD: dropped by the flood protection part of
395 * CAKE qdisc AQM algorithm (BLUE).
396 */
397 SKB_DROP_REASON_CAKE_FLOOD,
398 /**
399 * @SKB_DROP_REASON_FQ_BAND_LIMIT: dropped by fq qdisc when per band
400 * limit is reached.
401 */
402 SKB_DROP_REASON_FQ_BAND_LIMIT,
403 /**
404 * @SKB_DROP_REASON_FQ_HORIZON_LIMIT: dropped by fq qdisc when packet
405 * timestamp is too far in the future.
406 */
407 SKB_DROP_REASON_FQ_HORIZON_LIMIT,
408 /**
409 * @SKB_DROP_REASON_FQ_FLOW_LIMIT: dropped by fq qdisc when a flow
410 * exceeds its limits.
411 */
412 SKB_DROP_REASON_FQ_FLOW_LIMIT,
413 /**
414 * @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU
415 * backlog queue. This can be caused by backlog queue full (see
416 * netdev_max_backlog in net.rst) or RPS flow limit
417 */
418 SKB_DROP_REASON_CPU_BACKLOG,
419 /** @SKB_DROP_REASON_XDP: dropped by XDP in input path */
420 SKB_DROP_REASON_XDP,
421 /** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */
422 SKB_DROP_REASON_TC_INGRESS,
423 /** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */
424 SKB_DROP_REASON_UNHANDLED_PROTO,
425 /** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */
426 SKB_DROP_REASON_SKB_CSUM,
427 /** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */
428 SKB_DROP_REASON_SKB_GSO_SEG,
429 /**
430 * @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space,
431 * e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx()
432 */
433 SKB_DROP_REASON_SKB_UCOPY_FAULT,
434 /** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */
435 SKB_DROP_REASON_DEV_HDR,
436 /**
437 * @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to
438 * any of its data structure that is not up/ready/initialized,
439 * e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq]
440 * is not initialized
441 */
442 SKB_DROP_REASON_DEV_READY,
443 /** @SKB_DROP_REASON_FULL_RING: ring buffer is full */
444 SKB_DROP_REASON_FULL_RING,
445 /** @SKB_DROP_REASON_NOMEM: error due to OOM */
446 SKB_DROP_REASON_NOMEM,
447 /**
448 * @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from
449 * networking data, e.g., failed to pull the protocol header from
450 * frags via pskb_may_pull()
451 */
452 SKB_DROP_REASON_HDR_TRUNC,
453 /**
454 * @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached
455 * to tun/tap, e.g., via TUNSETFILTEREBPF
456 */
457 SKB_DROP_REASON_TAP_FILTER,
458 /**
459 * @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at
460 * tun/tap, e.g., check_filter()
461 */
462 SKB_DROP_REASON_TAP_TXFILTER,
463 /** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */
464 SKB_DROP_REASON_ICMP_CSUM,
465 /**
466 * @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211,
467 * such as a broadcasts ICMP_TIMESTAMP
468 */
469 SKB_DROP_REASON_INVALID_PROTO,
470 /**
471 * @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to
472 * IPSTATS_MIB_INADDRERRORS
473 */
474 SKB_DROP_REASON_IP_INADDRERRORS,
475 /**
476 * @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to
477 * IPSTATS_MIB_INADDRERRORS
478 */
479 SKB_DROP_REASON_IP_INNOROUTES,
480 /** @SKB_DROP_REASON_IP_LOCAL_SOURCE: the source ip is local */
481 SKB_DROP_REASON_IP_LOCAL_SOURCE,
482 /**
483 * @SKB_DROP_REASON_IP_INVALID_SOURCE: the source ip is invalid:
484 * 1) source ip is multicast or limited broadcast
485 * 2) source ip is zero and not IGMP
486 */
487 SKB_DROP_REASON_IP_INVALID_SOURCE,
488 /** @SKB_DROP_REASON_IP_LOCALNET: source or dest ip is local net */
489 SKB_DROP_REASON_IP_LOCALNET,
490 /**
491 * @SKB_DROP_REASON_IP_INVALID_DEST: the dest ip is invalid:
492 * 1) dest ip is 0
493 */
494 SKB_DROP_REASON_IP_INVALID_DEST,
495 /**
496 * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the
497 * MTU)
498 */
499 SKB_DROP_REASON_PKT_TOO_BIG,
500 /** @SKB_DROP_REASON_DUP_FRAG: duplicate fragment */
501 SKB_DROP_REASON_DUP_FRAG,
502 /** @SKB_DROP_REASON_FRAG_REASM_TIMEOUT: fragment reassembly timeout */
503 SKB_DROP_REASON_FRAG_REASM_TIMEOUT,
504 /**
505 * @SKB_DROP_REASON_FRAG_TOO_FAR: ipv4 fragment too far.
506 * (/proc/sys/net/ipv4/ipfrag_max_dist)
507 */
508 SKB_DROP_REASON_FRAG_TOO_FAR,
509 /**
510 * @SKB_DROP_REASON_TCP_MINTTL: ipv4 ttl or ipv6 hoplimit below
511 * the threshold (IP_MINTTL or IPV6_MINHOPCOUNT).
512 */
513 SKB_DROP_REASON_TCP_MINTTL,
514 /** @SKB_DROP_REASON_IPV6_BAD_EXTHDR: Bad IPv6 extension header. */
515 SKB_DROP_REASON_IPV6_BAD_EXTHDR,
516 /** @SKB_DROP_REASON_IPV6_NDISC_FRAG: invalid frag (suppress_frag_ndisc). */
517 SKB_DROP_REASON_IPV6_NDISC_FRAG,
518 /** @SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT: invalid hop limit. */
519 SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT,
520 /** @SKB_DROP_REASON_IPV6_NDISC_BAD_CODE: invalid NDISC icmp6 code. */
521 SKB_DROP_REASON_IPV6_NDISC_BAD_CODE,
522 /** @SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS: invalid NDISC options. */
523 SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS,
524 /**
525 * @SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST: NEIGHBOUR SOLICITATION
526 * for another host.
527 */
528 SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST,
529 /** @SKB_DROP_REASON_QUEUE_PURGE: bulk free. */
530 SKB_DROP_REASON_QUEUE_PURGE,
531 /**
532 * @SKB_DROP_REASON_TC_COOKIE_ERROR: An error occurred whilst
533 * processing a tc ext cookie.
534 */
535 SKB_DROP_REASON_TC_COOKIE_ERROR,
536 /**
537 * @SKB_DROP_REASON_PACKET_SOCK_ERROR: generic packet socket errors
538 * after its filter matches an incoming packet.
539 */
540 SKB_DROP_REASON_PACKET_SOCK_ERROR,
541 /** @SKB_DROP_REASON_TC_CHAIN_NOTFOUND: tc chain lookup failed. */
542 SKB_DROP_REASON_TC_CHAIN_NOTFOUND,
543 /**
544 * @SKB_DROP_REASON_TC_RECLASSIFY_LOOP: tc exceeded max reclassify loop
545 * iterations.
546 */
547 SKB_DROP_REASON_TC_RECLASSIFY_LOOP,
548 /**
549 * @SKB_DROP_REASON_VXLAN_INVALID_HDR: VXLAN header is invalid. E.g.:
550 * 1) reserved fields are not zero
551 * 2) "I" flag is not set
552 */
553 SKB_DROP_REASON_VXLAN_INVALID_HDR,
554 /** @SKB_DROP_REASON_VXLAN_VNI_NOT_FOUND: no VXLAN device found for VNI */
555 SKB_DROP_REASON_VXLAN_VNI_NOT_FOUND,
556 /** @SKB_DROP_REASON_MAC_INVALID_SOURCE: source mac is invalid */
557 SKB_DROP_REASON_MAC_INVALID_SOURCE,
558 /**
559 * @SKB_DROP_REASON_VXLAN_ENTRY_EXISTS: trying to migrate a static
560 * entry or an entry pointing to a nexthop.
561 */
562 SKB_DROP_REASON_VXLAN_ENTRY_EXISTS,
563 /** @SKB_DROP_REASON_NO_TX_TARGET: no target found for xmit */
564 SKB_DROP_REASON_NO_TX_TARGET,
565 /**
566 * @SKB_DROP_REASON_IP_TUNNEL_ECN: skb is dropped according to
567 * RFC 6040 4.2, see __INET_ECN_decapsulate() for detail.
568 */
569 SKB_DROP_REASON_IP_TUNNEL_ECN,
570 /**
571 * @SKB_DROP_REASON_TUNNEL_TXINFO: packet without necessary metadata
572 * reached a device which is in "external" mode.
573 */
574 SKB_DROP_REASON_TUNNEL_TXINFO,
575 /**
576 * @SKB_DROP_REASON_LOCAL_MAC: the source MAC address is equal to
577 * the MAC address of the local netdev.
578 */
579 SKB_DROP_REASON_LOCAL_MAC,
580 /**
581 * @SKB_DROP_REASON_ARP_PVLAN_DISABLE: packet which is not IP is
582 * forwarded to the in_dev, and the proxy_arp_pvlan is not
583 * enabled.
584 */
585 SKB_DROP_REASON_ARP_PVLAN_DISABLE,
586 /**
587 * @SKB_DROP_REASON_MAC_IEEE_MAC_CONTROL: the destination MAC address
588 * is an IEEE MAC Control address.
589 */
590 SKB_DROP_REASON_MAC_IEEE_MAC_CONTROL,
591 /**
592 * @SKB_DROP_REASON_BRIDGE_INGRESS_STP_STATE: the STP state of the
593 * ingress bridge port does not allow frames to be forwarded.
594 */
595 SKB_DROP_REASON_BRIDGE_INGRESS_STP_STATE,
596 /**
597 * @SKB_DROP_REASON_CAN_RX_INVALID_FRAME: received
598 * non conform CAN frame (or device is unable to receive CAN frames)
599 */
600 SKB_DROP_REASON_CAN_RX_INVALID_FRAME,
601 /**
602 * @SKB_DROP_REASON_CANFD_RX_INVALID_FRAME: received
603 * non conform CAN-FD frame (or device is unable to receive CAN frames)
604 */
605 SKB_DROP_REASON_CANFD_RX_INVALID_FRAME,
606 /**
607 * @SKB_DROP_REASON_CANXL_RX_INVALID_FRAME: received
608 * non conform CAN-XL frame (or device is unable to receive CAN frames)
609 */
610 SKB_DROP_REASON_CANXL_RX_INVALID_FRAME,
611 /**
612 * @SKB_DROP_REASON_PFMEMALLOC: packet allocated from memory reserve
613 * reached a path or socket not eligible for use of memory reserves
614 */
615 SKB_DROP_REASON_PFMEMALLOC,
616 /**
617 * @SKB_DROP_REASON_DUALPI2_STEP_DROP: dropped by the step drop
618 * threshold of DualPI2 qdisc.
619 */
620 SKB_DROP_REASON_DUALPI2_STEP_DROP,
621 /** @SKB_DROP_REASON_PSP_INPUT: PSP input checks failed */
622 SKB_DROP_REASON_PSP_INPUT,
623 /** @SKB_DROP_REASON_PSP_OUTPUT: PSP output checks failed */
624 SKB_DROP_REASON_PSP_OUTPUT,
625 /**
626 * @SKB_DROP_REASON_MAX: the maximum of core drop reasons, which
627 * shouldn't be used as a real 'reason' - only for tracing code gen
628 */
629 SKB_DROP_REASON_MAX,
630
631 /**
632 * @SKB_DROP_REASON_SUBSYS_MASK: subsystem mask in drop reasons,
633 * see &enum skb_drop_reason_subsys
634 */
635 SKB_DROP_REASON_SUBSYS_MASK = 0xffff0000,
636};
637
638#define SKB_DROP_REASON_SUBSYS_SHIFT 16
639
640#define SKB_DR_INIT(name, reason) \
641 enum skb_drop_reason name = SKB_DROP_REASON_##reason
642#define SKB_DR(name) \
643 SKB_DR_INIT(name, NOT_SPECIFIED)
644#define SKB_DR_SET(name, reason) \
645 (name = SKB_DROP_REASON_##reason)
646#define SKB_DR_OR(name, reason) \
647 do { \
648 if (name == SKB_DROP_REASON_NOT_SPECIFIED || \
649 name == SKB_NOT_DROPPED_YET) \
650 SKB_DR_SET(name, reason); \
651 } while (0)
652
653#endif
654

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