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(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 | FN(TCP_MINTTL) \ |
75 | FN(IPV6_BAD_EXTHDR) \ |
76 | FN(IPV6_NDISC_FRAG) \ |
77 | FN(IPV6_NDISC_HOP_LIMIT) \ |
78 | FN(IPV6_NDISC_BAD_CODE) \ |
79 | FN(IPV6_NDISC_BAD_OPTIONS) \ |
80 | FN(IPV6_NDISC_NS_OTHERHOST) \ |
81 | FNe(MAX) |
82 | |
83 | /** |
84 | * enum skb_drop_reason - the reasons of skb drops |
85 | * |
86 | * The reason of skb drop, which is used in kfree_skb_reason(). |
87 | */ |
88 | enum skb_drop_reason { |
89 | /** |
90 | * @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case) |
91 | */ |
92 | SKB_NOT_DROPPED_YET = 0, |
93 | /** @SKB_CONSUMED: packet has been consumed */ |
94 | SKB_CONSUMED, |
95 | /** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */ |
96 | SKB_DROP_REASON_NOT_SPECIFIED, |
97 | /** @SKB_DROP_REASON_NO_SOCKET: socket not found */ |
98 | SKB_DROP_REASON_NO_SOCKET, |
99 | /** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */ |
100 | SKB_DROP_REASON_PKT_TOO_SMALL, |
101 | /** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */ |
102 | SKB_DROP_REASON_TCP_CSUM, |
103 | /** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */ |
104 | SKB_DROP_REASON_SOCKET_FILTER, |
105 | /** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */ |
106 | SKB_DROP_REASON_UDP_CSUM, |
107 | /** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */ |
108 | SKB_DROP_REASON_NETFILTER_DROP, |
109 | /** |
110 | * @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host |
111 | * (interface is in promisc mode) |
112 | */ |
113 | SKB_DROP_REASON_OTHERHOST, |
114 | /** @SKB_DROP_REASON_IP_CSUM: IP checksum error */ |
115 | SKB_DROP_REASON_IP_CSUM, |
116 | /** |
117 | * @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see |
118 | * IPSTATS_MIB_INHDRERRORS) |
119 | */ |
120 | SKB_DROP_REASON_IP_INHDR, |
121 | /** |
122 | * @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the |
123 | * document for rp_filter in ip-sysctl.rst for more information |
124 | */ |
125 | SKB_DROP_REASON_IP_RPFILTER, |
126 | /** |
127 | * @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is |
128 | * multicast, but L3 is unicast. |
129 | */ |
130 | SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST, |
131 | /** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */ |
132 | SKB_DROP_REASON_XFRM_POLICY, |
133 | /** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */ |
134 | SKB_DROP_REASON_IP_NOPROTO, |
135 | /** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */ |
136 | SKB_DROP_REASON_SOCKET_RCVBUFF, |
137 | /** |
138 | * @SKB_DROP_REASON_PROTO_MEM: proto memory limition, such as udp packet |
139 | * drop out of udp_memory_allocated. |
140 | */ |
141 | SKB_DROP_REASON_PROTO_MEM, |
142 | /** |
143 | * @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected, |
144 | * corresponding to LINUX_MIB_TCPMD5NOTFOUND |
145 | */ |
146 | SKB_DROP_REASON_TCP_MD5NOTFOUND, |
147 | /** |
148 | * @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting |
149 | * one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED |
150 | */ |
151 | SKB_DROP_REASON_TCP_MD5UNEXPECTED, |
152 | /** |
153 | * @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding |
154 | * to LINUX_MIB_TCPMD5FAILURE |
155 | */ |
156 | SKB_DROP_REASON_TCP_MD5FAILURE, |
157 | /** |
158 | * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog ( |
159 | * see LINUX_MIB_TCPBACKLOGDROP) |
160 | */ |
161 | SKB_DROP_REASON_SOCKET_BACKLOG, |
162 | /** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */ |
163 | SKB_DROP_REASON_TCP_FLAGS, |
164 | /** |
165 | * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero, |
166 | * see LINUX_MIB_TCPZEROWINDOWDROP |
167 | */ |
168 | SKB_DROP_REASON_TCP_ZEROWINDOW, |
169 | /** |
170 | * @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data reveived is already |
171 | * received before (spurious retrans may happened), see |
172 | * LINUX_MIB_DELAYEDACKLOST |
173 | */ |
174 | SKB_DROP_REASON_TCP_OLD_DATA, |
175 | /** |
176 | * @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window, |
177 | * the seq of the first byte exceed the right edges of receive |
178 | * window |
179 | */ |
180 | SKB_DROP_REASON_TCP_OVERWINDOW, |
181 | /** |
182 | * @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo |
183 | * queue, corresponding to LINUX_MIB_TCPOFOMERGE |
184 | */ |
185 | SKB_DROP_REASON_TCP_OFOMERGE, |
186 | /** |
187 | * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to |
188 | * LINUX_MIB_PAWSESTABREJECTED |
189 | */ |
190 | SKB_DROP_REASON_TCP_RFC7323_PAWS, |
191 | /** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */ |
192 | SKB_DROP_REASON_TCP_INVALID_SEQUENCE, |
193 | /** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */ |
194 | SKB_DROP_REASON_TCP_RESET, |
195 | /** |
196 | * @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected |
197 | * SYN flag |
198 | */ |
199 | SKB_DROP_REASON_TCP_INVALID_SYN, |
200 | /** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */ |
201 | SKB_DROP_REASON_TCP_CLOSE, |
202 | /** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */ |
203 | SKB_DROP_REASON_TCP_FASTOPEN, |
204 | /** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */ |
205 | SKB_DROP_REASON_TCP_OLD_ACK, |
206 | /** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */ |
207 | SKB_DROP_REASON_TCP_TOO_OLD_ACK, |
208 | /** |
209 | * @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't |
210 | * sent yet |
211 | */ |
212 | SKB_DROP_REASON_TCP_ACK_UNSENT_DATA, |
213 | /** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */ |
214 | SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE, |
215 | /** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */ |
216 | SKB_DROP_REASON_TCP_OFO_DROP, |
217 | /** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */ |
218 | SKB_DROP_REASON_IP_OUTNOROUTES, |
219 | /** |
220 | * @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB |
221 | * eBPF program |
222 | */ |
223 | SKB_DROP_REASON_BPF_CGROUP_EGRESS, |
224 | /** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */ |
225 | SKB_DROP_REASON_IPV6DISABLED, |
226 | /** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */ |
227 | SKB_DROP_REASON_NEIGH_CREATEFAIL, |
228 | /** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */ |
229 | SKB_DROP_REASON_NEIGH_FAILED, |
230 | /** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */ |
231 | SKB_DROP_REASON_NEIGH_QUEUEFULL, |
232 | /** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */ |
233 | SKB_DROP_REASON_NEIGH_DEAD, |
234 | /** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */ |
235 | SKB_DROP_REASON_TC_EGRESS, |
236 | /** |
237 | * @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting ( |
238 | * failed to enqueue to current qdisc) |
239 | */ |
240 | SKB_DROP_REASON_QDISC_DROP, |
241 | /** |
242 | * @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU |
243 | * backlog queue. This can be caused by backlog queue full (see |
244 | * netdev_max_backlog in net.rst) or RPS flow limit |
245 | */ |
246 | SKB_DROP_REASON_CPU_BACKLOG, |
247 | /** @SKB_DROP_REASON_XDP: dropped by XDP in input path */ |
248 | SKB_DROP_REASON_XDP, |
249 | /** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */ |
250 | SKB_DROP_REASON_TC_INGRESS, |
251 | /** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */ |
252 | SKB_DROP_REASON_UNHANDLED_PROTO, |
253 | /** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */ |
254 | SKB_DROP_REASON_SKB_CSUM, |
255 | /** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */ |
256 | SKB_DROP_REASON_SKB_GSO_SEG, |
257 | /** |
258 | * @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space, |
259 | * e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx() |
260 | */ |
261 | SKB_DROP_REASON_SKB_UCOPY_FAULT, |
262 | /** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */ |
263 | SKB_DROP_REASON_DEV_HDR, |
264 | /** |
265 | * @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to |
266 | * any of its data structure that is not up/ready/initialized, |
267 | * e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq] |
268 | * is not initialized |
269 | */ |
270 | SKB_DROP_REASON_DEV_READY, |
271 | /** @SKB_DROP_REASON_FULL_RING: ring buffer is full */ |
272 | SKB_DROP_REASON_FULL_RING, |
273 | /** @SKB_DROP_REASON_NOMEM: error due to OOM */ |
274 | SKB_DROP_REASON_NOMEM, |
275 | /** |
276 | * @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from |
277 | * networking data, e.g., failed to pull the protocol header from |
278 | * frags via pskb_may_pull() |
279 | */ |
280 | SKB_DROP_REASON_HDR_TRUNC, |
281 | /** |
282 | * @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached |
283 | * to tun/tap, e.g., via TUNSETFILTEREBPF |
284 | */ |
285 | SKB_DROP_REASON_TAP_FILTER, |
286 | /** |
287 | * @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at |
288 | * tun/tap, e.g., check_filter() |
289 | */ |
290 | SKB_DROP_REASON_TAP_TXFILTER, |
291 | /** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */ |
292 | SKB_DROP_REASON_ICMP_CSUM, |
293 | /** |
294 | * @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211, |
295 | * such as a broadcasts ICMP_TIMESTAMP |
296 | */ |
297 | SKB_DROP_REASON_INVALID_PROTO, |
298 | /** |
299 | * @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to |
300 | * IPSTATS_MIB_INADDRERRORS |
301 | */ |
302 | SKB_DROP_REASON_IP_INADDRERRORS, |
303 | /** |
304 | * @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to |
305 | * IPSTATS_MIB_INADDRERRORS |
306 | */ |
307 | SKB_DROP_REASON_IP_INNOROUTES, |
308 | /** |
309 | * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the |
310 | * MTU) |
311 | */ |
312 | SKB_DROP_REASON_PKT_TOO_BIG, |
313 | /** @SKB_DROP_REASON_DUP_FRAG: duplicate fragment */ |
314 | SKB_DROP_REASON_DUP_FRAG, |
315 | /** @SKB_DROP_REASON_FRAG_REASM_TIMEOUT: fragment reassembly timeout */ |
316 | SKB_DROP_REASON_FRAG_REASM_TIMEOUT, |
317 | /** |
318 | * @SKB_DROP_REASON_FRAG_TOO_FAR: ipv4 fragment too far. |
319 | * (/proc/sys/net/ipv4/ipfrag_max_dist) |
320 | */ |
321 | SKB_DROP_REASON_FRAG_TOO_FAR, |
322 | /** |
323 | * @SKB_DROP_REASON_TCP_MINTTL: ipv4 ttl or ipv6 hoplimit below |
324 | * the threshold (IP_MINTTL or IPV6_MINHOPCOUNT). |
325 | */ |
326 | SKB_DROP_REASON_TCP_MINTTL, |
327 | /** @SKB_DROP_REASON_IPV6_BAD_EXTHDR: Bad IPv6 extension header. */ |
328 | SKB_DROP_REASON_IPV6_BAD_EXTHDR, |
329 | /** @SKB_DROP_REASON_IPV6_NDISC_FRAG: invalid frag (suppress_frag_ndisc). */ |
330 | SKB_DROP_REASON_IPV6_NDISC_FRAG, |
331 | /** @SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT: invalid hop limit. */ |
332 | SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT, |
333 | /** @SKB_DROP_REASON_IPV6_NDISC_BAD_CODE: invalid NDISC icmp6 code. */ |
334 | SKB_DROP_REASON_IPV6_NDISC_BAD_CODE, |
335 | /** @SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS: invalid NDISC options. */ |
336 | SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS, |
337 | /** |
338 | * @SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST: NEIGHBOUR SOLICITATION |
339 | * for another host. |
340 | */ |
341 | SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST, |
342 | /** |
343 | * @SKB_DROP_REASON_MAX: the maximum of core drop reasons, which |
344 | * shouldn't be used as a real 'reason' - only for tracing code gen |
345 | */ |
346 | SKB_DROP_REASON_MAX, |
347 | |
348 | /** |
349 | * @SKB_DROP_REASON_SUBSYS_MASK: subsystem mask in drop reasons, |
350 | * see &enum skb_drop_reason_subsys |
351 | */ |
352 | SKB_DROP_REASON_SUBSYS_MASK = 0xffff0000, |
353 | }; |
354 | |
355 | #define SKB_DROP_REASON_SUBSYS_SHIFT 16 |
356 | |
357 | #define SKB_DR_INIT(name, reason) \ |
358 | enum skb_drop_reason name = SKB_DROP_REASON_##reason |
359 | #define SKB_DR(name) \ |
360 | SKB_DR_INIT(name, NOT_SPECIFIED) |
361 | #define SKB_DR_SET(name, reason) \ |
362 | (name = SKB_DROP_REASON_##reason) |
363 | #define SKB_DR_OR(name, reason) \ |
364 | do { \ |
365 | if (name == SKB_DROP_REASON_NOT_SPECIFIED || \ |
366 | name == SKB_NOT_DROPPED_YET) \ |
367 | SKB_DR_SET(name, reason); \ |
368 | } while (0) |
369 | |
370 | #endif |
371 | |