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