dropreason-core.h

  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