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_AUTH_HDR) \ 24 FN(TCP_MD5NOTFOUND) \ 25 FN(TCP_MD5UNEXPECTED) \ 26 FN(TCP_MD5FAILURE) \ 27 FN(TCP_AONOTFOUND) \ 28 FN(TCP_AOUNEXPECTED) \ 29 FN(TCP_AOKEYNOTFOUND) \ 30 FN(TCP_AOFAILURE) \ 31 FN(SOCKET_BACKLOG) \ 32 FN(TCP_FLAGS) \ 33 FN(TCP_ZEROWINDOW) \ 34 FN(TCP_OLD_DATA) \ 35 FN(TCP_OVERWINDOW) \ 36 FN(TCP_OFOMERGE) \ 37 FN(TCP_RFC7323_PAWS) \ 38 FN(TCP_OLD_SEQUENCE) \ 39 FN(TCP_INVALID_SEQUENCE) \ 40 FN(TCP_RESET) \ 41 FN(TCP_INVALID_SYN) \ 42 FN(TCP_CLOSE) \ 43 FN(TCP_FASTOPEN) \ 44 FN(TCP_OLD_ACK) \ 45 FN(TCP_TOO_OLD_ACK) \ 46 FN(TCP_ACK_UNSENT_DATA) \ 47 FN(TCP_OFO_QUEUE_PRUNE) \ 48 FN(TCP_OFO_DROP) \ 49 FN(IP_OUTNOROUTES) \ 50 FN(BPF_CGROUP_EGRESS) \ 51 FN(IPV6DISABLED) \ 52 FN(NEIGH_CREATEFAIL) \ 53 FN(NEIGH_FAILED) \ 54 FN(NEIGH_QUEUEFULL) \ 55 FN(NEIGH_DEAD) \ 56 FN(TC_EGRESS) \ 57 FN(QDISC_DROP) \ 58 FN(CPU_BACKLOG) \ 59 FN(XDP) \ 60 FN(TC_INGRESS) \ 61 FN(UNHANDLED_PROTO) \ 62 FN(SKB_CSUM) \ 63 FN(SKB_GSO_SEG) \ 64 FN(SKB_UCOPY_FAULT) \ 65 FN(DEV_HDR) \ 66 FN(DEV_READY) \ 67 FN(FULL_RING) \ 68 FN(NOMEM) \ 69 FN(HDR_TRUNC) \ 70 FN(TAP_FILTER) \ 71 FN(TAP_TXFILTER) \ 72 FN(ICMP_CSUM) \ 73 FN(INVALID_PROTO) \ 74 FN(IP_INADDRERRORS) \ 75 FN(IP_INNOROUTES) \ 76 FN(PKT_TOO_BIG) \ 77 FN(DUP_FRAG) \ 78 FN(FRAG_REASM_TIMEOUT) \ 79 FN(FRAG_TOO_FAR) \ 80 FN(TCP_MINTTL) \ 81 FN(IPV6_BAD_EXTHDR) \ 82 FN(IPV6_NDISC_FRAG) \ 83 FN(IPV6_NDISC_HOP_LIMIT) \ 84 FN(IPV6_NDISC_BAD_CODE) \ 85 FN(IPV6_NDISC_BAD_OPTIONS) \ 86 FN(IPV6_NDISC_NS_OTHERHOST) \ 87 FN(QUEUE_PURGE) \ 88 FN(TC_ERROR) \ 89 FNe(MAX) 90 91 /** 92 * enum skb_drop_reason - the reasons of skb drops 93 * 94 * The reason of skb drop, which is used in kfree_skb_reason(). 95 */ 96 enum skb_drop_reason { 97 /** 98 * @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case) 99 */ 100 SKB_NOT_DROPPED_YET = 0, 101 /** @SKB_CONSUMED: packet has been consumed */ 102 SKB_CONSUMED, 103 /** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */ 104 SKB_DROP_REASON_NOT_SPECIFIED, 105 /** @SKB_DROP_REASON_NO_SOCKET: socket not found */ 106 SKB_DROP_REASON_NO_SOCKET, 107 /** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */ 108 SKB_DROP_REASON_PKT_TOO_SMALL, 109 /** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */ 110 SKB_DROP_REASON_TCP_CSUM, 111 /** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */ 112 SKB_DROP_REASON_SOCKET_FILTER, 113 /** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */ 114 SKB_DROP_REASON_UDP_CSUM, 115 /** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */ 116 SKB_DROP_REASON_NETFILTER_DROP, 117 /** 118 * @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host 119 * (interface is in promisc mode) 120 */ 121 SKB_DROP_REASON_OTHERHOST, 122 /** @SKB_DROP_REASON_IP_CSUM: IP checksum error */ 123 SKB_DROP_REASON_IP_CSUM, 124 /** 125 * @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see 126 * IPSTATS_MIB_INHDRERRORS) 127 */ 128 SKB_DROP_REASON_IP_INHDR, 129 /** 130 * @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the 131 * document for rp_filter in ip-sysctl.rst for more information 132 */ 133 SKB_DROP_REASON_IP_RPFILTER, 134 /** 135 * @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is 136 * multicast, but L3 is unicast. 137 */ 138 SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST, 139 /** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */ 140 SKB_DROP_REASON_XFRM_POLICY, 141 /** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */ 142 SKB_DROP_REASON_IP_NOPROTO, 143 /** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */ 144 SKB_DROP_REASON_SOCKET_RCVBUFF, 145 /** 146 * @SKB_DROP_REASON_PROTO_MEM: proto memory limition, such as udp packet 147 * drop out of udp_memory_allocated. 148 */ 149 SKB_DROP_REASON_PROTO_MEM, 150 /** 151 * @SKB_DROP_REASON_TCP_AUTH_HDR: TCP-MD5 or TCP-AO hashes are met 152 * twice or set incorrectly. 153 */ 154 SKB_DROP_REASON_TCP_AUTH_HDR, 155 /** 156 * @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected, 157 * corresponding to LINUX_MIB_TCPMD5NOTFOUND 158 */ 159 SKB_DROP_REASON_TCP_MD5NOTFOUND, 160 /** 161 * @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting 162 * one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED 163 */ 164 SKB_DROP_REASON_TCP_MD5UNEXPECTED, 165 /** 166 * @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding 167 * to LINUX_MIB_TCPMD5FAILURE 168 */ 169 SKB_DROP_REASON_TCP_MD5FAILURE, 170 /** 171 * @SKB_DROP_REASON_TCP_AONOTFOUND: no TCP-AO hash and one was expected, 172 * corresponding to LINUX_MIB_TCPAOREQUIRED 173 */ 174 SKB_DROP_REASON_TCP_AONOTFOUND, 175 /** 176 * @SKB_DROP_REASON_TCP_AOUNEXPECTED: TCP-AO hash is present and it 177 * was not expected, corresponding to LINUX_MIB_TCPAOKEYNOTFOUND 178 */ 179 SKB_DROP_REASON_TCP_AOUNEXPECTED, 180 /** 181 * @SKB_DROP_REASON_TCP_AOKEYNOTFOUND: TCP-AO key is unknown, 182 * corresponding to LINUX_MIB_TCPAOKEYNOTFOUND 183 */ 184 SKB_DROP_REASON_TCP_AOKEYNOTFOUND, 185 /** 186 * @SKB_DROP_REASON_TCP_AOFAILURE: TCP-AO hash is wrong, 187 * corresponding to LINUX_MIB_TCPAOBAD 188 */ 189 SKB_DROP_REASON_TCP_AOFAILURE, 190 /** 191 * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog ( 192 * see LINUX_MIB_TCPBACKLOGDROP) 193 */ 194 SKB_DROP_REASON_SOCKET_BACKLOG, 195 /** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */ 196 SKB_DROP_REASON_TCP_FLAGS, 197 /** 198 * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero, 199 * see LINUX_MIB_TCPZEROWINDOWDROP 200 */ 201 SKB_DROP_REASON_TCP_ZEROWINDOW, 202 /** 203 * @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data reveived is already 204 * received before (spurious retrans may happened), see 205 * LINUX_MIB_DELAYEDACKLOST 206 */ 207 SKB_DROP_REASON_TCP_OLD_DATA, 208 /** 209 * @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window, 210 * the seq of the first byte exceed the right edges of receive 211 * window 212 */ 213 SKB_DROP_REASON_TCP_OVERWINDOW, 214 /** 215 * @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo 216 * queue, corresponding to LINUX_MIB_TCPOFOMERGE 217 */ 218 SKB_DROP_REASON_TCP_OFOMERGE, 219 /** 220 * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to 221 * LINUX_MIB_PAWSESTABREJECTED 222 */ 223 SKB_DROP_REASON_TCP_RFC7323_PAWS, 224 /** @SKB_DROP_REASON_TCP_OLD_SEQUENCE: Old SEQ field (duplicate packet) */ 225 SKB_DROP_REASON_TCP_OLD_SEQUENCE, 226 /** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */ 227 SKB_DROP_REASON_TCP_INVALID_SEQUENCE, 228 /** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */ 229 SKB_DROP_REASON_TCP_RESET, 230 /** 231 * @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected 232 * SYN flag 233 */ 234 SKB_DROP_REASON_TCP_INVALID_SYN, 235 /** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */ 236 SKB_DROP_REASON_TCP_CLOSE, 237 /** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */ 238 SKB_DROP_REASON_TCP_FASTOPEN, 239 /** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */ 240 SKB_DROP_REASON_TCP_OLD_ACK, 241 /** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */ 242 SKB_DROP_REASON_TCP_TOO_OLD_ACK, 243 /** 244 * @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't 245 * sent yet 246 */ 247 SKB_DROP_REASON_TCP_ACK_UNSENT_DATA, 248 /** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */ 249 SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE, 250 /** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */ 251 SKB_DROP_REASON_TCP_OFO_DROP, 252 /** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */ 253 SKB_DROP_REASON_IP_OUTNOROUTES, 254 /** 255 * @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB 256 * eBPF program 257 */ 258 SKB_DROP_REASON_BPF_CGROUP_EGRESS, 259 /** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */ 260 SKB_DROP_REASON_IPV6DISABLED, 261 /** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */ 262 SKB_DROP_REASON_NEIGH_CREATEFAIL, 263 /** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */ 264 SKB_DROP_REASON_NEIGH_FAILED, 265 /** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */ 266 SKB_DROP_REASON_NEIGH_QUEUEFULL, 267 /** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */ 268 SKB_DROP_REASON_NEIGH_DEAD, 269 /** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */ 270 SKB_DROP_REASON_TC_EGRESS, 271 /** 272 * @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting ( 273 * failed to enqueue to current qdisc) 274 */ 275 SKB_DROP_REASON_QDISC_DROP, 276 /** 277 * @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU 278 * backlog queue. This can be caused by backlog queue full (see 279 * netdev_max_backlog in net.rst) or RPS flow limit 280 */ 281 SKB_DROP_REASON_CPU_BACKLOG, 282 /** @SKB_DROP_REASON_XDP: dropped by XDP in input path */ 283 SKB_DROP_REASON_XDP, 284 /** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */ 285 SKB_DROP_REASON_TC_INGRESS, 286 /** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */ 287 SKB_DROP_REASON_UNHANDLED_PROTO, 288 /** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */ 289 SKB_DROP_REASON_SKB_CSUM, 290 /** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */ 291 SKB_DROP_REASON_SKB_GSO_SEG, 292 /** 293 * @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space, 294 * e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx() 295 */ 296 SKB_DROP_REASON_SKB_UCOPY_FAULT, 297 /** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */ 298 SKB_DROP_REASON_DEV_HDR, 299 /** 300 * @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to 301 * any of its data structure that is not up/ready/initialized, 302 * e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq] 303 * is not initialized 304 */ 305 SKB_DROP_REASON_DEV_READY, 306 /** @SKB_DROP_REASON_FULL_RING: ring buffer is full */ 307 SKB_DROP_REASON_FULL_RING, 308 /** @SKB_DROP_REASON_NOMEM: error due to OOM */ 309 SKB_DROP_REASON_NOMEM, 310 /** 311 * @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from 312 * networking data, e.g., failed to pull the protocol header from 313 * frags via pskb_may_pull() 314 */ 315 SKB_DROP_REASON_HDR_TRUNC, 316 /** 317 * @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached 318 * to tun/tap, e.g., via TUNSETFILTEREBPF 319 */ 320 SKB_DROP_REASON_TAP_FILTER, 321 /** 322 * @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at 323 * tun/tap, e.g., check_filter() 324 */ 325 SKB_DROP_REASON_TAP_TXFILTER, 326 /** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */ 327 SKB_DROP_REASON_ICMP_CSUM, 328 /** 329 * @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211, 330 * such as a broadcasts ICMP_TIMESTAMP 331 */ 332 SKB_DROP_REASON_INVALID_PROTO, 333 /** 334 * @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to 335 * IPSTATS_MIB_INADDRERRORS 336 */ 337 SKB_DROP_REASON_IP_INADDRERRORS, 338 /** 339 * @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to 340 * IPSTATS_MIB_INADDRERRORS 341 */ 342 SKB_DROP_REASON_IP_INNOROUTES, 343 /** 344 * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the 345 * MTU) 346 */ 347 SKB_DROP_REASON_PKT_TOO_BIG, 348 /** @SKB_DROP_REASON_DUP_FRAG: duplicate fragment */ 349 SKB_DROP_REASON_DUP_FRAG, 350 /** @SKB_DROP_REASON_FRAG_REASM_TIMEOUT: fragment reassembly timeout */ 351 SKB_DROP_REASON_FRAG_REASM_TIMEOUT, 352 /** 353 * @SKB_DROP_REASON_FRAG_TOO_FAR: ipv4 fragment too far. 354 * (/proc/sys/net/ipv4/ipfrag_max_dist) 355 */ 356 SKB_DROP_REASON_FRAG_TOO_FAR, 357 /** 358 * @SKB_DROP_REASON_TCP_MINTTL: ipv4 ttl or ipv6 hoplimit below 359 * the threshold (IP_MINTTL or IPV6_MINHOPCOUNT). 360 */ 361 SKB_DROP_REASON_TCP_MINTTL, 362 /** @SKB_DROP_REASON_IPV6_BAD_EXTHDR: Bad IPv6 extension header. */ 363 SKB_DROP_REASON_IPV6_BAD_EXTHDR, 364 /** @SKB_DROP_REASON_IPV6_NDISC_FRAG: invalid frag (suppress_frag_ndisc). */ 365 SKB_DROP_REASON_IPV6_NDISC_FRAG, 366 /** @SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT: invalid hop limit. */ 367 SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT, 368 /** @SKB_DROP_REASON_IPV6_NDISC_BAD_CODE: invalid NDISC icmp6 code. */ 369 SKB_DROP_REASON_IPV6_NDISC_BAD_CODE, 370 /** @SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS: invalid NDISC options. */ 371 SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS, 372 /** 373 * @SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST: NEIGHBOUR SOLICITATION 374 * for another host. 375 */ 376 SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST, 377 /** @SKB_DROP_REASON_QUEUE_PURGE: bulk free. */ 378 SKB_DROP_REASON_QUEUE_PURGE, 379 /** @SKB_DROP_REASON_TC_ERROR: generic internal tc error. */ 380 SKB_DROP_REASON_TC_ERROR, 381 /** 382 * @SKB_DROP_REASON_MAX: the maximum of core drop reasons, which 383 * shouldn't be used as a real 'reason' - only for tracing code gen 384 */ 385 SKB_DROP_REASON_MAX, 386 387 /** 388 * @SKB_DROP_REASON_SUBSYS_MASK: subsystem mask in drop reasons, 389 * see &enum skb_drop_reason_subsys 390 */ 391 SKB_DROP_REASON_SUBSYS_MASK = 0xffff0000, 392 }; 393 394 #define SKB_DROP_REASON_SUBSYS_SHIFT 16 395 396 #define SKB_DR_INIT(name, reason) \ 397 enum skb_drop_reason name = SKB_DROP_REASON_##reason 398 #define SKB_DR(name) \ 399 SKB_DR_INIT(name, NOT_SPECIFIED) 400 #define SKB_DR_SET(name, reason) \ 401 (name = SKB_DROP_REASON_##reason) 402 #define SKB_DR_OR(name, reason) \ 403 do { \ 404 if (name == SKB_DROP_REASON_NOT_SPECIFIED || \ 405 name == SKB_NOT_DROPPED_YET) \ 406 SKB_DR_SET(name, reason); \ 407 } while (0) 408 409 #endif 410