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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2
3#ifndef _LINUX_DROPREASON_H
4#define _LINUX_DROPREASON_H
5#include <net/dropreason-core.h>
6
7/**
8 * enum skb_drop_reason_subsys - subsystem tag for (extended) drop reasons
9 */
10enum skb_drop_reason_subsys {
11 /** @SKB_DROP_REASON_SUBSYS_CORE: core drop reasons defined above */
12 SKB_DROP_REASON_SUBSYS_CORE,
13
14 /**
15 * @SKB_DROP_REASON_SUBSYS_MAC80211_UNUSABLE: mac80211 drop reasons
16 * for unusable frames, see net/mac80211/drop.h
17 */
18 SKB_DROP_REASON_SUBSYS_MAC80211_UNUSABLE,
19
20 /**
21 * @SKB_DROP_REASON_SUBSYS_MAC80211_MONITOR: mac80211 drop reasons
22 * for frames still going to monitor, see net/mac80211/drop.h
23 */
24 SKB_DROP_REASON_SUBSYS_MAC80211_MONITOR,
25
26 /**
27 * @SKB_DROP_REASON_SUBSYS_OPENVSWITCH: openvswitch drop reasons,
28 * see net/openvswitch/drop.h
29 */
30 SKB_DROP_REASON_SUBSYS_OPENVSWITCH,
31
32 /** @SKB_DROP_REASON_SUBSYS_NUM: number of subsystems defined */
33 SKB_DROP_REASON_SUBSYS_NUM
34};
35
36struct drop_reason_list {
37 const char * const *reasons;
38 size_t n_reasons;
39};
40
41/* Note: due to dynamic registrations, access must be under RCU */
42extern const struct drop_reason_list __rcu *
43drop_reasons_by_subsys[SKB_DROP_REASON_SUBSYS_NUM];
44
45void drop_reasons_register_subsys(enum skb_drop_reason_subsys subsys,
46 const struct drop_reason_list *list);
47void drop_reasons_unregister_subsys(enum skb_drop_reason_subsys subsys);
48
49#endif
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2
3#ifndef _LINUX_DROPREASON_H
4#define _LINUX_DROPREASON_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_MD5NOTFOUND) \
24 FN(TCP_MD5UNEXPECTED) \
25 FN(TCP_MD5FAILURE) \
26 FN(SOCKET_BACKLOG) \
27 FN(TCP_FLAGS) \
28 FN(TCP_ZEROWINDOW) \
29 FN(TCP_OLD_DATA) \
30 FN(TCP_OVERWINDOW) \
31 FN(TCP_OFOMERGE) \
32 FN(TCP_RFC7323_PAWS) \
33 FN(TCP_INVALID_SEQUENCE) \
34 FN(TCP_RESET) \
35 FN(TCP_INVALID_SYN) \
36 FN(TCP_CLOSE) \
37 FN(TCP_FASTOPEN) \
38 FN(TCP_OLD_ACK) \
39 FN(TCP_TOO_OLD_ACK) \
40 FN(TCP_ACK_UNSENT_DATA) \
41 FN(TCP_OFO_QUEUE_PRUNE) \
42 FN(TCP_OFO_DROP) \
43 FN(IP_OUTNOROUTES) \
44 FN(BPF_CGROUP_EGRESS) \
45 FN(IPV6DISABLED) \
46 FN(NEIGH_CREATEFAIL) \
47 FN(NEIGH_FAILED) \
48 FN(NEIGH_QUEUEFULL) \
49 FN(NEIGH_DEAD) \
50 FN(TC_EGRESS) \
51 FN(QDISC_DROP) \
52 FN(CPU_BACKLOG) \
53 FN(XDP) \
54 FN(TC_INGRESS) \
55 FN(UNHANDLED_PROTO) \
56 FN(SKB_CSUM) \
57 FN(SKB_GSO_SEG) \
58 FN(SKB_UCOPY_FAULT) \
59 FN(DEV_HDR) \
60 FN(DEV_READY) \
61 FN(FULL_RING) \
62 FN(NOMEM) \
63 FN(HDR_TRUNC) \
64 FN(TAP_FILTER) \
65 FN(TAP_TXFILTER) \
66 FN(ICMP_CSUM) \
67 FN(INVALID_PROTO) \
68 FN(IP_INADDRERRORS) \
69 FN(IP_INNOROUTES) \
70 FN(PKT_TOO_BIG) \
71 FN(DUP_FRAG) \
72 FN(FRAG_REASM_TIMEOUT) \
73 FN(FRAG_TOO_FAR) \
74 FNe(MAX)
75
76/**
77 * enum skb_drop_reason - the reasons of skb drops
78 *
79 * The reason of skb drop, which is used in kfree_skb_reason().
80 */
81enum skb_drop_reason {
82 /**
83 * @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case)
84 */
85 SKB_NOT_DROPPED_YET = 0,
86 /** @SKB_CONSUMED: packet has been consumed */
87 SKB_CONSUMED,
88 /** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */
89 SKB_DROP_REASON_NOT_SPECIFIED,
90 /** @SKB_DROP_REASON_NO_SOCKET: socket not found */
91 SKB_DROP_REASON_NO_SOCKET,
92 /** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */
93 SKB_DROP_REASON_PKT_TOO_SMALL,
94 /** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */
95 SKB_DROP_REASON_TCP_CSUM,
96 /** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */
97 SKB_DROP_REASON_SOCKET_FILTER,
98 /** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */
99 SKB_DROP_REASON_UDP_CSUM,
100 /** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */
101 SKB_DROP_REASON_NETFILTER_DROP,
102 /**
103 * @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host
104 * (interface is in promisc mode)
105 */
106 SKB_DROP_REASON_OTHERHOST,
107 /** @SKB_DROP_REASON_IP_CSUM: IP checksum error */
108 SKB_DROP_REASON_IP_CSUM,
109 /**
110 * @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see
111 * IPSTATS_MIB_INHDRERRORS)
112 */
113 SKB_DROP_REASON_IP_INHDR,
114 /**
115 * @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the
116 * document for rp_filter in ip-sysctl.rst for more information
117 */
118 SKB_DROP_REASON_IP_RPFILTER,
119 /**
120 * @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is
121 * multicast, but L3 is unicast.
122 */
123 SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST,
124 /** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */
125 SKB_DROP_REASON_XFRM_POLICY,
126 /** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */
127 SKB_DROP_REASON_IP_NOPROTO,
128 /** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */
129 SKB_DROP_REASON_SOCKET_RCVBUFF,
130 /**
131 * @SKB_DROP_REASON_PROTO_MEM: proto memory limition, such as udp packet
132 * drop out of udp_memory_allocated.
133 */
134 SKB_DROP_REASON_PROTO_MEM,
135 /**
136 * @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected,
137 * corresponding to LINUX_MIB_TCPMD5NOTFOUND
138 */
139 SKB_DROP_REASON_TCP_MD5NOTFOUND,
140 /**
141 * @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting
142 * one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED
143 */
144 SKB_DROP_REASON_TCP_MD5UNEXPECTED,
145 /**
146 * @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding
147 * to LINUX_MIB_TCPMD5FAILURE
148 */
149 SKB_DROP_REASON_TCP_MD5FAILURE,
150 /**
151 * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog (
152 * see LINUX_MIB_TCPBACKLOGDROP)
153 */
154 SKB_DROP_REASON_SOCKET_BACKLOG,
155 /** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */
156 SKB_DROP_REASON_TCP_FLAGS,
157 /**
158 * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero,
159 * see LINUX_MIB_TCPZEROWINDOWDROP
160 */
161 SKB_DROP_REASON_TCP_ZEROWINDOW,
162 /**
163 * @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data reveived is already
164 * received before (spurious retrans may happened), see
165 * LINUX_MIB_DELAYEDACKLOST
166 */
167 SKB_DROP_REASON_TCP_OLD_DATA,
168 /**
169 * @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window,
170 * the seq of the first byte exceed the right edges of receive
171 * window
172 */
173 SKB_DROP_REASON_TCP_OVERWINDOW,
174 /**
175 * @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo
176 * queue, corresponding to LINUX_MIB_TCPOFOMERGE
177 */
178 SKB_DROP_REASON_TCP_OFOMERGE,
179 /**
180 * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to
181 * LINUX_MIB_PAWSESTABREJECTED
182 */
183 SKB_DROP_REASON_TCP_RFC7323_PAWS,
184 /** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */
185 SKB_DROP_REASON_TCP_INVALID_SEQUENCE,
186 /** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */
187 SKB_DROP_REASON_TCP_RESET,
188 /**
189 * @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected
190 * SYN flag
191 */
192 SKB_DROP_REASON_TCP_INVALID_SYN,
193 /** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */
194 SKB_DROP_REASON_TCP_CLOSE,
195 /** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */
196 SKB_DROP_REASON_TCP_FASTOPEN,
197 /** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */
198 SKB_DROP_REASON_TCP_OLD_ACK,
199 /** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */
200 SKB_DROP_REASON_TCP_TOO_OLD_ACK,
201 /**
202 * @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't
203 * sent yet
204 */
205 SKB_DROP_REASON_TCP_ACK_UNSENT_DATA,
206 /** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */
207 SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE,
208 /** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */
209 SKB_DROP_REASON_TCP_OFO_DROP,
210 /** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */
211 SKB_DROP_REASON_IP_OUTNOROUTES,
212 /**
213 * @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB
214 * eBPF program
215 */
216 SKB_DROP_REASON_BPF_CGROUP_EGRESS,
217 /** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */
218 SKB_DROP_REASON_IPV6DISABLED,
219 /** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */
220 SKB_DROP_REASON_NEIGH_CREATEFAIL,
221 /** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */
222 SKB_DROP_REASON_NEIGH_FAILED,
223 /** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */
224 SKB_DROP_REASON_NEIGH_QUEUEFULL,
225 /** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */
226 SKB_DROP_REASON_NEIGH_DEAD,
227 /** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */
228 SKB_DROP_REASON_TC_EGRESS,
229 /**
230 * @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting (
231 * failed to enqueue to current qdisc)
232 */
233 SKB_DROP_REASON_QDISC_DROP,
234 /**
235 * @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU
236 * backlog queue. This can be caused by backlog queue full (see
237 * netdev_max_backlog in net.rst) or RPS flow limit
238 */
239 SKB_DROP_REASON_CPU_BACKLOG,
240 /** @SKB_DROP_REASON_XDP: dropped by XDP in input path */
241 SKB_DROP_REASON_XDP,
242 /** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */
243 SKB_DROP_REASON_TC_INGRESS,
244 /** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */
245 SKB_DROP_REASON_UNHANDLED_PROTO,
246 /** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */
247 SKB_DROP_REASON_SKB_CSUM,
248 /** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */
249 SKB_DROP_REASON_SKB_GSO_SEG,
250 /**
251 * @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space,
252 * e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx()
253 */
254 SKB_DROP_REASON_SKB_UCOPY_FAULT,
255 /** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */
256 SKB_DROP_REASON_DEV_HDR,
257 /**
258 * @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to
259 * any of its data structure that is not up/ready/initialized,
260 * e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq]
261 * is not initialized
262 */
263 SKB_DROP_REASON_DEV_READY,
264 /** @SKB_DROP_REASON_FULL_RING: ring buffer is full */
265 SKB_DROP_REASON_FULL_RING,
266 /** @SKB_DROP_REASON_NOMEM: error due to OOM */
267 SKB_DROP_REASON_NOMEM,
268 /**
269 * @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from
270 * networking data, e.g., failed to pull the protocol header from
271 * frags via pskb_may_pull()
272 */
273 SKB_DROP_REASON_HDR_TRUNC,
274 /**
275 * @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached
276 * to tun/tap, e.g., via TUNSETFILTEREBPF
277 */
278 SKB_DROP_REASON_TAP_FILTER,
279 /**
280 * @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at
281 * tun/tap, e.g., check_filter()
282 */
283 SKB_DROP_REASON_TAP_TXFILTER,
284 /** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */
285 SKB_DROP_REASON_ICMP_CSUM,
286 /**
287 * @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211,
288 * such as a broadcasts ICMP_TIMESTAMP
289 */
290 SKB_DROP_REASON_INVALID_PROTO,
291 /**
292 * @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to
293 * IPSTATS_MIB_INADDRERRORS
294 */
295 SKB_DROP_REASON_IP_INADDRERRORS,
296 /**
297 * @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to
298 * IPSTATS_MIB_INADDRERRORS
299 */
300 SKB_DROP_REASON_IP_INNOROUTES,
301 /**
302 * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the
303 * MTU)
304 */
305 SKB_DROP_REASON_PKT_TOO_BIG,
306 /** @SKB_DROP_REASON_DUP_FRAG: duplicate fragment */
307 SKB_DROP_REASON_DUP_FRAG,
308 /** @SKB_DROP_REASON_FRAG_REASM_TIMEOUT: fragment reassembly timeout */
309 SKB_DROP_REASON_FRAG_REASM_TIMEOUT,
310 /**
311 * @SKB_DROP_REASON_FRAG_TOO_FAR: ipv4 fragment too far.
312 * (/proc/sys/net/ipv4/ipfrag_max_dist)
313 */
314 SKB_DROP_REASON_FRAG_TOO_FAR,
315 /**
316 * @SKB_DROP_REASON_MAX: the maximum of drop reason, which shouldn't be
317 * used as a real 'reason'
318 */
319 SKB_DROP_REASON_MAX,
320};
321
322#define SKB_DR_INIT(name, reason) \
323 enum skb_drop_reason name = SKB_DROP_REASON_##reason
324#define SKB_DR(name) \
325 SKB_DR_INIT(name, NOT_SPECIFIED)
326#define SKB_DR_SET(name, reason) \
327 (name = SKB_DROP_REASON_##reason)
328#define SKB_DR_OR(name, reason) \
329 do { \
330 if (name == SKB_DROP_REASON_NOT_SPECIFIED || \
331 name == SKB_NOT_DROPPED_YET) \
332 SKB_DR_SET(name, reason); \
333 } while (0)
334
335extern const char * const drop_reasons[];
336
337#endif