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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(CPU_BACKLOG) \
72 FN(MACVLAN_BROADCAST_BACKLOG) \
73 FN(IPVLAN_MULTICAST_BACKLOG) \
74 FN(XDP) \
75 FN(TC_INGRESS) \
76 FN(UNHANDLED_PROTO) \
77 FN(SKB_CSUM) \
78 FN(SKB_GSO_SEG) \
79 FN(SKB_BAD_GSO) \
80 FN(SKB_UCOPY_FAULT) \
81 FN(DEV_HDR) \
82 FN(DEV_READY) \
83 FN(FULL_RING) \
84 FN(NOMEM) \
85 FN(HDR_TRUNC) \
86 FN(TAP_FILTER) \
87 FN(TAP_TXFILTER) \
88 FN(ICMP_CSUM) \
89 FN(INVALID_PROTO) \
90 FN(IP_INADDRERRORS) \
91 FN(IP_INNOROUTES) \
92 FN(IP_LOCAL_SOURCE) \
93 FN(IP_INVALID_SOURCE) \
94 FN(IP_LOCALNET) \
95 FN(IP_INVALID_DEST) \
96 FN(PKT_TOO_BIG) \
97 FN(DUP_FRAG) \
98 FN(FRAG_REASM_TIMEOUT) \
99 FN(FRAG_TOO_FAR) \
100 FN(TCP_MINTTL) \
101 FN(IPV6_BAD_EXTHDR) \
102 FN(IPV6_TOO_MANY_EXTHDRS) \
103 FN(IPV6_NDISC_FRAG) \
104 FN(IPV6_NDISC_HOP_LIMIT) \
105 FN(IPV6_NDISC_BAD_CODE) \
106 FN(IPV6_NDISC_BAD_OPTIONS) \
107 FN(IPV6_NDISC_NS_OTHERHOST) \
108 FN(QUEUE_PURGE) \
109 FN(TC_COOKIE_ERROR) \
110 FN(PACKET_SOCK_ERROR) \
111 FN(TC_CHAIN_NOTFOUND) \
112 FN(TC_RECLASSIFY_LOOP) \
113 FN(VXLAN_INVALID_HDR) \
114 FN(VXLAN_VNI_NOT_FOUND) \
115 FN(MAC_INVALID_SOURCE) \
116 FN(VXLAN_ENTRY_EXISTS) \
117 FN(NO_TX_TARGET) \
118 FN(IP_TUNNEL_ECN) \
119 FN(TUNNEL_TXINFO) \
120 FN(LOCAL_MAC) \
121 FN(ARP_PVLAN_DISABLE) \
122 FN(MAC_IEEE_MAC_CONTROL) \
123 FN(BRIDGE_INGRESS_STP_STATE) \
124 FN(CAN_RX_INVALID_FRAME) \
125 FN(CANFD_RX_INVALID_FRAME) \
126 FN(CANXL_RX_INVALID_FRAME) \
127 FN(PFMEMALLOC) \
128 FN(PSP_INPUT) \
129 FN(PSP_OUTPUT) \
130 FN(RECURSION_LIMIT) \
131 FNe(MAX)
132
133/**
134 * enum skb_drop_reason - the reasons of skb drops
135 *
136 * The reason of skb drop, which is used in kfree_skb_reason().
137 */
138enum skb_drop_reason {
139 /**
140 * @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case)
141 */
142 SKB_NOT_DROPPED_YET = 0,
143 /** @SKB_CONSUMED: packet has been consumed */
144 SKB_CONSUMED,
145 /** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */
146 SKB_DROP_REASON_NOT_SPECIFIED,
147 /**
148 * @SKB_DROP_REASON_NO_SOCKET: no valid socket that can be used.
149 * Reason could be one of three cases:
150 * 1) no established/listening socket found during lookup process
151 * 2) no valid request socket during 3WHS process
152 * 3) no valid child socket during 3WHS process
153 */
154 SKB_DROP_REASON_NO_SOCKET,
155 /** @SKB_DROP_REASON_SOCKET_CLOSE: socket is close()d */
156 SKB_DROP_REASON_SOCKET_CLOSE,
157 /** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */
158 SKB_DROP_REASON_SOCKET_FILTER,
159 /** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */
160 SKB_DROP_REASON_SOCKET_RCVBUFF,
161 /**
162 * @SKB_DROP_REASON_UNIX_DISCONNECT: recv queue is purged when SOCK_DGRAM
163 * or SOCK_SEQPACKET socket re-connect()s to another socket or notices
164 * during send() that the peer has been close()d.
165 */
166 SKB_DROP_REASON_UNIX_DISCONNECT,
167 /**
168 * @SKB_DROP_REASON_UNIX_SKIP_OOB: Out-Of-Band data is skipped by
169 * recv() without MSG_OOB so dropped.
170 */
171 SKB_DROP_REASON_UNIX_SKIP_OOB,
172 /** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */
173 SKB_DROP_REASON_PKT_TOO_SMALL,
174 /** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */
175 SKB_DROP_REASON_TCP_CSUM,
176 /** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */
177 SKB_DROP_REASON_UDP_CSUM,
178 /** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */
179 SKB_DROP_REASON_NETFILTER_DROP,
180 /**
181 * @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host
182 * (interface is in promisc mode)
183 */
184 SKB_DROP_REASON_OTHERHOST,
185 /** @SKB_DROP_REASON_IP_CSUM: IP checksum error */
186 SKB_DROP_REASON_IP_CSUM,
187 /**
188 * @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see
189 * IPSTATS_MIB_INHDRERRORS)
190 */
191 SKB_DROP_REASON_IP_INHDR,
192 /**
193 * @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the
194 * document for rp_filter in ip-sysctl.rst for more information
195 */
196 SKB_DROP_REASON_IP_RPFILTER,
197 /**
198 * @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is
199 * multicast, but L3 is unicast.
200 */
201 SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST,
202 /** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */
203 SKB_DROP_REASON_XFRM_POLICY,
204 /** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */
205 SKB_DROP_REASON_IP_NOPROTO,
206 /**
207 * @SKB_DROP_REASON_PROTO_MEM: proto memory limitation, such as
208 * udp packet drop out of udp_memory_allocated.
209 */
210 SKB_DROP_REASON_PROTO_MEM,
211 /**
212 * @SKB_DROP_REASON_TCP_AUTH_HDR: TCP-MD5 or TCP-AO hashes are met
213 * twice or set incorrectly.
214 */
215 SKB_DROP_REASON_TCP_AUTH_HDR,
216 /**
217 * @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected,
218 * corresponding to LINUX_MIB_TCPMD5NOTFOUND
219 */
220 SKB_DROP_REASON_TCP_MD5NOTFOUND,
221 /**
222 * @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting
223 * one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED
224 */
225 SKB_DROP_REASON_TCP_MD5UNEXPECTED,
226 /**
227 * @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding
228 * to LINUX_MIB_TCPMD5FAILURE
229 */
230 SKB_DROP_REASON_TCP_MD5FAILURE,
231 /**
232 * @SKB_DROP_REASON_TCP_AONOTFOUND: no TCP-AO hash and one was expected,
233 * corresponding to LINUX_MIB_TCPAOREQUIRED
234 */
235 SKB_DROP_REASON_TCP_AONOTFOUND,
236 /**
237 * @SKB_DROP_REASON_TCP_AOUNEXPECTED: TCP-AO hash is present and it
238 * was not expected, corresponding to LINUX_MIB_TCPAOKEYNOTFOUND
239 */
240 SKB_DROP_REASON_TCP_AOUNEXPECTED,
241 /**
242 * @SKB_DROP_REASON_TCP_AOKEYNOTFOUND: TCP-AO key is unknown,
243 * corresponding to LINUX_MIB_TCPAOKEYNOTFOUND
244 */
245 SKB_DROP_REASON_TCP_AOKEYNOTFOUND,
246 /**
247 * @SKB_DROP_REASON_TCP_AOFAILURE: TCP-AO hash is wrong,
248 * corresponding to LINUX_MIB_TCPAOBAD
249 */
250 SKB_DROP_REASON_TCP_AOFAILURE,
251 /**
252 * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog (
253 * see LINUX_MIB_TCPBACKLOGDROP)
254 */
255 SKB_DROP_REASON_SOCKET_BACKLOG,
256 /** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */
257 SKB_DROP_REASON_TCP_FLAGS,
258 /**
259 * @SKB_DROP_REASON_TCP_ABORT_ON_DATA: abort on data, corresponding to
260 * LINUX_MIB_TCPABORTONDATA
261 */
262 SKB_DROP_REASON_TCP_ABORT_ON_DATA,
263 /**
264 * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero,
265 * see LINUX_MIB_TCPZEROWINDOWDROP
266 */
267 SKB_DROP_REASON_TCP_ZEROWINDOW,
268 /**
269 * @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data received is already
270 * received before (spurious retrans may happened), see
271 * LINUX_MIB_DELAYEDACKLOST
272 */
273 SKB_DROP_REASON_TCP_OLD_DATA,
274 /**
275 * @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window,
276 * the seq of the first byte exceed the right edges of receive
277 * window
278 */
279 SKB_DROP_REASON_TCP_OVERWINDOW,
280 /**
281 * @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo
282 * queue, corresponding to LINUX_MIB_TCPOFOMERGE
283 */
284 SKB_DROP_REASON_TCP_OFOMERGE,
285 /**
286 * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to
287 * LINUX_MIB_PAWSESTABREJECTED, LINUX_MIB_PAWSACTIVEREJECTED
288 */
289 SKB_DROP_REASON_TCP_RFC7323_PAWS,
290 /**
291 * @SKB_DROP_REASON_TCP_RFC7323_PAWS_ACK: PAWS check, old ACK packet.
292 * Corresponds to LINUX_MIB_PAWS_OLD_ACK.
293 */
294 SKB_DROP_REASON_TCP_RFC7323_PAWS_ACK,
295 /**
296 * @SKB_DROP_REASON_TCP_RFC7323_TW_PAWS: PAWS check, socket is in
297 * TIME_WAIT state.
298 * Corresponds to LINUX_MIB_PAWS_TW_REJECTED.
299 */
300 SKB_DROP_REASON_TCP_RFC7323_TW_PAWS,
301 /**
302 * @SKB_DROP_REASON_TCP_RFC7323_TSECR: PAWS check, invalid TSEcr.
303 * Corresponds to LINUX_MIB_TSECRREJECTED.
304 */
305 SKB_DROP_REASON_TCP_RFC7323_TSECR,
306 /** @SKB_DROP_REASON_TCP_LISTEN_OVERFLOW: listener queue full. */
307 SKB_DROP_REASON_TCP_LISTEN_OVERFLOW,
308 /** @SKB_DROP_REASON_TCP_OLD_SEQUENCE: Old SEQ field (duplicate packet) */
309 SKB_DROP_REASON_TCP_OLD_SEQUENCE,
310 /** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field. */
311 SKB_DROP_REASON_TCP_INVALID_SEQUENCE,
312 /**
313 * @SKB_DROP_REASON_TCP_INVALID_END_SEQUENCE:
314 * Not acceptable END_SEQ field.
315 * Corresponds to LINUX_MIB_BEYOND_WINDOW.
316 */
317 SKB_DROP_REASON_TCP_INVALID_END_SEQUENCE,
318 /**
319 * @SKB_DROP_REASON_TCP_INVALID_ACK_SEQUENCE: Not acceptable ACK SEQ
320 * field because ack sequence is not in the window between snd_una
321 * and snd_nxt
322 */
323 SKB_DROP_REASON_TCP_INVALID_ACK_SEQUENCE,
324 /** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */
325 SKB_DROP_REASON_TCP_RESET,
326 /**
327 * @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected
328 * SYN flag
329 */
330 SKB_DROP_REASON_TCP_INVALID_SYN,
331 /** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */
332 SKB_DROP_REASON_TCP_CLOSE,
333 /** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */
334 SKB_DROP_REASON_TCP_FASTOPEN,
335 /** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */
336 SKB_DROP_REASON_TCP_OLD_ACK,
337 /** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */
338 SKB_DROP_REASON_TCP_TOO_OLD_ACK,
339 /**
340 * @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't
341 * sent yet
342 */
343 SKB_DROP_REASON_TCP_ACK_UNSENT_DATA,
344 /** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */
345 SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE,
346 /** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */
347 SKB_DROP_REASON_TCP_OFO_DROP,
348 /** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */
349 SKB_DROP_REASON_IP_OUTNOROUTES,
350 /**
351 * @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB
352 * eBPF program
353 */
354 SKB_DROP_REASON_BPF_CGROUP_EGRESS,
355 /** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */
356 SKB_DROP_REASON_IPV6DISABLED,
357 /** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */
358 SKB_DROP_REASON_NEIGH_CREATEFAIL,
359 /** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */
360 SKB_DROP_REASON_NEIGH_FAILED,
361 /** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */
362 SKB_DROP_REASON_NEIGH_QUEUEFULL,
363 /** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */
364 SKB_DROP_REASON_NEIGH_DEAD,
365 /** @SKB_DROP_REASON_NEIGH_HH_FILLFAIL: failed to fill the device hard header */
366 SKB_DROP_REASON_NEIGH_HH_FILLFAIL,
367 /** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */
368 SKB_DROP_REASON_TC_EGRESS,
369 /** @SKB_DROP_REASON_SECURITY_HOOK: dropped due to security HOOK */
370 SKB_DROP_REASON_SECURITY_HOOK,
371 /**
372 * @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc during enqueue or
373 * dequeue. More specific drop reasons are available via the
374 * qdisc:qdisc_drop tracepoint, which also provides qdisc handle
375 * and name for identifying the source.
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_CPU_BACKLOG: failed to enqueue the skb to the per CPU
385 * backlog queue. This can be caused by backlog queue full (see
386 * netdev_max_backlog in net.rst) or RPS flow limit
387 */
388 SKB_DROP_REASON_CPU_BACKLOG,
389 /**
390 * @SKB_DROP_REASON_MACVLAN_BROADCAST_BACKLOG: failed to enqueue the skb
391 * to macvlan broadcast queue.
392 */
393 SKB_DROP_REASON_MACVLAN_BROADCAST_BACKLOG,
394 /**
395 * @SKB_DROP_REASON_IPVLAN_MULTICAST_BACKLOG: failed to enqueue the skb
396 * to ipvlan multicast queue.
397 */
398 SKB_DROP_REASON_IPVLAN_MULTICAST_BACKLOG,
399 /** @SKB_DROP_REASON_XDP: dropped by XDP in input path */
400 SKB_DROP_REASON_XDP,
401 /** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */
402 SKB_DROP_REASON_TC_INGRESS,
403 /** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */
404 SKB_DROP_REASON_UNHANDLED_PROTO,
405 /** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */
406 SKB_DROP_REASON_SKB_CSUM,
407 /** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */
408 SKB_DROP_REASON_SKB_GSO_SEG,
409 /** @SKB_DROP_REASON_SKB_BAD_GSO: malicious gso packet. */
410 SKB_DROP_REASON_SKB_BAD_GSO,
411 /**
412 * @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space,
413 * e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx()
414 */
415 SKB_DROP_REASON_SKB_UCOPY_FAULT,
416 /** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */
417 SKB_DROP_REASON_DEV_HDR,
418 /**
419 * @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to
420 * any of its data structure that is not up/ready/initialized,
421 * e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq]
422 * is not initialized
423 */
424 SKB_DROP_REASON_DEV_READY,
425 /** @SKB_DROP_REASON_FULL_RING: ring buffer is full */
426 SKB_DROP_REASON_FULL_RING,
427 /** @SKB_DROP_REASON_NOMEM: error due to OOM */
428 SKB_DROP_REASON_NOMEM,
429 /**
430 * @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from
431 * networking data, e.g., failed to pull the protocol header from
432 * frags via pskb_may_pull()
433 */
434 SKB_DROP_REASON_HDR_TRUNC,
435 /**
436 * @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached
437 * to tun/tap, e.g., via TUNSETFILTEREBPF
438 */
439 SKB_DROP_REASON_TAP_FILTER,
440 /**
441 * @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at
442 * tun/tap, e.g., check_filter()
443 */
444 SKB_DROP_REASON_TAP_TXFILTER,
445 /** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */
446 SKB_DROP_REASON_ICMP_CSUM,
447 /**
448 * @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211,
449 * such as a broadcasts ICMP_TIMESTAMP
450 */
451 SKB_DROP_REASON_INVALID_PROTO,
452 /**
453 * @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to
454 * IPSTATS_MIB_INADDRERRORS
455 */
456 SKB_DROP_REASON_IP_INADDRERRORS,
457 /**
458 * @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to
459 * IPSTATS_MIB_INADDRERRORS
460 */
461 SKB_DROP_REASON_IP_INNOROUTES,
462 /** @SKB_DROP_REASON_IP_LOCAL_SOURCE: the source ip is local */
463 SKB_DROP_REASON_IP_LOCAL_SOURCE,
464 /**
465 * @SKB_DROP_REASON_IP_INVALID_SOURCE: the source ip is invalid:
466 * 1) source ip is multicast or limited broadcast
467 * 2) source ip is zero and not IGMP
468 */
469 SKB_DROP_REASON_IP_INVALID_SOURCE,
470 /** @SKB_DROP_REASON_IP_LOCALNET: source or dest ip is local net */
471 SKB_DROP_REASON_IP_LOCALNET,
472 /**
473 * @SKB_DROP_REASON_IP_INVALID_DEST: the dest ip is invalid:
474 * 1) dest ip is 0
475 */
476 SKB_DROP_REASON_IP_INVALID_DEST,
477 /**
478 * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the
479 * MTU)
480 */
481 SKB_DROP_REASON_PKT_TOO_BIG,
482 /** @SKB_DROP_REASON_DUP_FRAG: duplicate fragment */
483 SKB_DROP_REASON_DUP_FRAG,
484 /** @SKB_DROP_REASON_FRAG_REASM_TIMEOUT: fragment reassembly timeout */
485 SKB_DROP_REASON_FRAG_REASM_TIMEOUT,
486 /**
487 * @SKB_DROP_REASON_FRAG_TOO_FAR: ipv4 fragment too far.
488 * (/proc/sys/net/ipv4/ipfrag_max_dist)
489 */
490 SKB_DROP_REASON_FRAG_TOO_FAR,
491 /**
492 * @SKB_DROP_REASON_TCP_MINTTL: ipv4 ttl or ipv6 hoplimit below
493 * the threshold (IP_MINTTL or IPV6_MINHOPCOUNT).
494 */
495 SKB_DROP_REASON_TCP_MINTTL,
496 /** @SKB_DROP_REASON_IPV6_BAD_EXTHDR: Bad IPv6 extension header. */
497 SKB_DROP_REASON_IPV6_BAD_EXTHDR,
498 /**
499 * @SKB_DROP_REASON_IPV6_TOO_MANY_EXTHDRS: Number of IPv6 extension
500 * headers in the packet exceeds IP6_MAX_EXT_HDRS_CNT.
501 */
502 SKB_DROP_REASON_IPV6_TOO_MANY_EXTHDRS,
503 /** @SKB_DROP_REASON_IPV6_NDISC_FRAG: invalid frag (suppress_frag_ndisc). */
504 SKB_DROP_REASON_IPV6_NDISC_FRAG,
505 /** @SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT: invalid hop limit. */
506 SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT,
507 /** @SKB_DROP_REASON_IPV6_NDISC_BAD_CODE: invalid NDISC icmp6 code. */
508 SKB_DROP_REASON_IPV6_NDISC_BAD_CODE,
509 /** @SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS: invalid NDISC options. */
510 SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS,
511 /**
512 * @SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST: NEIGHBOUR SOLICITATION
513 * for another host.
514 */
515 SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST,
516 /** @SKB_DROP_REASON_QUEUE_PURGE: bulk free. */
517 SKB_DROP_REASON_QUEUE_PURGE,
518 /**
519 * @SKB_DROP_REASON_TC_COOKIE_ERROR: An error occurred whilst
520 * processing a tc ext cookie.
521 */
522 SKB_DROP_REASON_TC_COOKIE_ERROR,
523 /**
524 * @SKB_DROP_REASON_PACKET_SOCK_ERROR: generic packet socket errors
525 * after its filter matches an incoming packet.
526 */
527 SKB_DROP_REASON_PACKET_SOCK_ERROR,
528 /** @SKB_DROP_REASON_TC_CHAIN_NOTFOUND: tc chain lookup failed. */
529 SKB_DROP_REASON_TC_CHAIN_NOTFOUND,
530 /**
531 * @SKB_DROP_REASON_TC_RECLASSIFY_LOOP: tc exceeded max reclassify loop
532 * iterations.
533 */
534 SKB_DROP_REASON_TC_RECLASSIFY_LOOP,
535 /**
536 * @SKB_DROP_REASON_VXLAN_INVALID_HDR: VXLAN header is invalid. E.g.:
537 * 1) reserved fields are not zero
538 * 2) "I" flag is not set
539 */
540 SKB_DROP_REASON_VXLAN_INVALID_HDR,
541 /** @SKB_DROP_REASON_VXLAN_VNI_NOT_FOUND: no VXLAN device found for VNI */
542 SKB_DROP_REASON_VXLAN_VNI_NOT_FOUND,
543 /** @SKB_DROP_REASON_MAC_INVALID_SOURCE: source mac is invalid */
544 SKB_DROP_REASON_MAC_INVALID_SOURCE,
545 /**
546 * @SKB_DROP_REASON_VXLAN_ENTRY_EXISTS: trying to migrate a static
547 * entry or an entry pointing to a nexthop.
548 */
549 SKB_DROP_REASON_VXLAN_ENTRY_EXISTS,
550 /** @SKB_DROP_REASON_NO_TX_TARGET: no target found for xmit */
551 SKB_DROP_REASON_NO_TX_TARGET,
552 /**
553 * @SKB_DROP_REASON_IP_TUNNEL_ECN: skb is dropped according to
554 * RFC 6040 4.2, see __INET_ECN_decapsulate() for detail.
555 */
556 SKB_DROP_REASON_IP_TUNNEL_ECN,
557 /**
558 * @SKB_DROP_REASON_TUNNEL_TXINFO: packet without necessary metadata
559 * reached a device which is in "external" mode.
560 */
561 SKB_DROP_REASON_TUNNEL_TXINFO,
562 /**
563 * @SKB_DROP_REASON_LOCAL_MAC: the source MAC address is equal to
564 * the MAC address of the local netdev.
565 */
566 SKB_DROP_REASON_LOCAL_MAC,
567 /**
568 * @SKB_DROP_REASON_ARP_PVLAN_DISABLE: packet which is not IP is
569 * forwarded to the in_dev, and the proxy_arp_pvlan is not
570 * enabled.
571 */
572 SKB_DROP_REASON_ARP_PVLAN_DISABLE,
573 /**
574 * @SKB_DROP_REASON_MAC_IEEE_MAC_CONTROL: the destination MAC address
575 * is an IEEE MAC Control address.
576 */
577 SKB_DROP_REASON_MAC_IEEE_MAC_CONTROL,
578 /**
579 * @SKB_DROP_REASON_BRIDGE_INGRESS_STP_STATE: the STP state of the
580 * ingress bridge port does not allow frames to be forwarded.
581 */
582 SKB_DROP_REASON_BRIDGE_INGRESS_STP_STATE,
583 /**
584 * @SKB_DROP_REASON_CAN_RX_INVALID_FRAME: received
585 * non conform CAN frame (or device is unable to receive CAN frames)
586 */
587 SKB_DROP_REASON_CAN_RX_INVALID_FRAME,
588 /**
589 * @SKB_DROP_REASON_CANFD_RX_INVALID_FRAME: received
590 * non conform CAN-FD frame (or device is unable to receive CAN frames)
591 */
592 SKB_DROP_REASON_CANFD_RX_INVALID_FRAME,
593 /**
594 * @SKB_DROP_REASON_CANXL_RX_INVALID_FRAME: received
595 * non conform CAN-XL frame (or device is unable to receive CAN frames)
596 */
597 SKB_DROP_REASON_CANXL_RX_INVALID_FRAME,
598 /**
599 * @SKB_DROP_REASON_PFMEMALLOC: packet allocated from memory reserve
600 * reached a path or socket not eligible for use of memory reserves
601 */
602 SKB_DROP_REASON_PFMEMALLOC,
603 /** @SKB_DROP_REASON_PSP_INPUT: PSP input checks failed */
604 SKB_DROP_REASON_PSP_INPUT,
605 /** @SKB_DROP_REASON_PSP_OUTPUT: PSP output checks failed */
606 SKB_DROP_REASON_PSP_OUTPUT,
607 /** @SKB_DROP_REASON_RECURSION_LIMIT: Dead loop on virtual device. */
608 SKB_DROP_REASON_RECURSION_LIMIT,
609 /**
610 * @SKB_DROP_REASON_MAX: the maximum of core drop reasons, which
611 * shouldn't be used as a real 'reason' - only for tracing code gen
612 */
613 SKB_DROP_REASON_MAX,
614
615 /**
616 * @SKB_DROP_REASON_SUBSYS_MASK: subsystem mask in drop reasons,
617 * see &enum skb_drop_reason_subsys
618 */
619 SKB_DROP_REASON_SUBSYS_MASK = 0xffff0000,
620};
621
622#define SKB_DROP_REASON_SUBSYS_SHIFT 16
623
624#define SKB_DR_INIT(name, reason) \
625 enum skb_drop_reason name = SKB_DROP_REASON_##reason
626#define SKB_DR(name) \
627 SKB_DR_INIT(name, NOT_SPECIFIED)
628#define SKB_DR_SET(name, reason) \
629 (name = SKB_DROP_REASON_##reason)
630#define SKB_DR_OR(name, reason) \
631 do { \
632 if (name == SKB_DROP_REASON_NOT_SPECIFIED || \
633 name == SKB_NOT_DROPPED_YET) \
634 SKB_DR_SET(name, reason); \
635 } while (0)
636
637#endif