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 FN(PACKET_SOCK_ERROR) \ 90 FNe(MAX) 91 92 /** 93 * enum skb_drop_reason - the reasons of skb drops 94 * 95 * The reason of skb drop, which is used in kfree_skb_reason(). 96 */ 97 enum skb_drop_reason { 98 /** 99 * @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case) 100 */ 101 SKB_NOT_DROPPED_YET = 0, 102 /** @SKB_CONSUMED: packet has been consumed */ 103 SKB_CONSUMED, 104 /** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */ 105 SKB_DROP_REASON_NOT_SPECIFIED, 106 /** @SKB_DROP_REASON_NO_SOCKET: socket not found */ 107 SKB_DROP_REASON_NO_SOCKET, 108 /** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */ 109 SKB_DROP_REASON_PKT_TOO_SMALL, 110 /** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */ 111 SKB_DROP_REASON_TCP_CSUM, 112 /** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */ 113 SKB_DROP_REASON_SOCKET_FILTER, 114 /** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */ 115 SKB_DROP_REASON_UDP_CSUM, 116 /** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */ 117 SKB_DROP_REASON_NETFILTER_DROP, 118 /** 119 * @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host 120 * (interface is in promisc mode) 121 */ 122 SKB_DROP_REASON_OTHERHOST, 123 /** @SKB_DROP_REASON_IP_CSUM: IP checksum error */ 124 SKB_DROP_REASON_IP_CSUM, 125 /** 126 * @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see 127 * IPSTATS_MIB_INHDRERRORS) 128 */ 129 SKB_DROP_REASON_IP_INHDR, 130 /** 131 * @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the 132 * document for rp_filter in ip-sysctl.rst for more information 133 */ 134 SKB_DROP_REASON_IP_RPFILTER, 135 /** 136 * @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is 137 * multicast, but L3 is unicast. 138 */ 139 SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST, 140 /** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */ 141 SKB_DROP_REASON_XFRM_POLICY, 142 /** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */ 143 SKB_DROP_REASON_IP_NOPROTO, 144 /** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */ 145 SKB_DROP_REASON_SOCKET_RCVBUFF, 146 /** 147 * @SKB_DROP_REASON_PROTO_MEM: proto memory limition, such as udp packet 148 * drop out of udp_memory_allocated. 149 */ 150 SKB_DROP_REASON_PROTO_MEM, 151 /** 152 * @SKB_DROP_REASON_TCP_AUTH_HDR: TCP-MD5 or TCP-AO hashes are met 153 * twice or set incorrectly. 154 */ 155 SKB_DROP_REASON_TCP_AUTH_HDR, 156 /** 157 * @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected, 158 * corresponding to LINUX_MIB_TCPMD5NOTFOUND 159 */ 160 SKB_DROP_REASON_TCP_MD5NOTFOUND, 161 /** 162 * @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting 163 * one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED 164 */ 165 SKB_DROP_REASON_TCP_MD5UNEXPECTED, 166 /** 167 * @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding 168 * to LINUX_MIB_TCPMD5FAILURE 169 */ 170 SKB_DROP_REASON_TCP_MD5FAILURE, 171 /** 172 * @SKB_DROP_REASON_TCP_AONOTFOUND: no TCP-AO hash and one was expected, 173 * corresponding to LINUX_MIB_TCPAOREQUIRED 174 */ 175 SKB_DROP_REASON_TCP_AONOTFOUND, 176 /** 177 * @SKB_DROP_REASON_TCP_AOUNEXPECTED: TCP-AO hash is present and it 178 * was not expected, corresponding to LINUX_MIB_TCPAOKEYNOTFOUND 179 */ 180 SKB_DROP_REASON_TCP_AOUNEXPECTED, 181 /** 182 * @SKB_DROP_REASON_TCP_AOKEYNOTFOUND: TCP-AO key is unknown, 183 * corresponding to LINUX_MIB_TCPAOKEYNOTFOUND 184 */ 185 SKB_DROP_REASON_TCP_AOKEYNOTFOUND, 186 /** 187 * @SKB_DROP_REASON_TCP_AOFAILURE: TCP-AO hash is wrong, 188 * corresponding to LINUX_MIB_TCPAOBAD 189 */ 190 SKB_DROP_REASON_TCP_AOFAILURE, 191 /** 192 * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog ( 193 * see LINUX_MIB_TCPBACKLOGDROP) 194 */ 195 SKB_DROP_REASON_SOCKET_BACKLOG, 196 /** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */ 197 SKB_DROP_REASON_TCP_FLAGS, 198 /** 199 * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero, 200 * see LINUX_MIB_TCPZEROWINDOWDROP 201 */ 202 SKB_DROP_REASON_TCP_ZEROWINDOW, 203 /** 204 * @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data reveived is already 205 * received before (spurious retrans may happened), see 206 * LINUX_MIB_DELAYEDACKLOST 207 */ 208 SKB_DROP_REASON_TCP_OLD_DATA, 209 /** 210 * @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window, 211 * the seq of the first byte exceed the right edges of receive 212 * window 213 */ 214 SKB_DROP_REASON_TCP_OVERWINDOW, 215 /** 216 * @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo 217 * queue, corresponding to LINUX_MIB_TCPOFOMERGE 218 */ 219 SKB_DROP_REASON_TCP_OFOMERGE, 220 /** 221 * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to 222 * LINUX_MIB_PAWSESTABREJECTED 223 */ 224 SKB_DROP_REASON_TCP_RFC7323_PAWS, 225 /** @SKB_DROP_REASON_TCP_OLD_SEQUENCE: Old SEQ field (duplicate packet) */ 226 SKB_DROP_REASON_TCP_OLD_SEQUENCE, 227 /** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */ 228 SKB_DROP_REASON_TCP_INVALID_SEQUENCE, 229 /** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */ 230 SKB_DROP_REASON_TCP_RESET, 231 /** 232 * @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected 233 * SYN flag 234 */ 235 SKB_DROP_REASON_TCP_INVALID_SYN, 236 /** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */ 237 SKB_DROP_REASON_TCP_CLOSE, 238 /** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */ 239 SKB_DROP_REASON_TCP_FASTOPEN, 240 /** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */ 241 SKB_DROP_REASON_TCP_OLD_ACK, 242 /** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */ 243 SKB_DROP_REASON_TCP_TOO_OLD_ACK, 244 /** 245 * @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't 246 * sent yet 247 */ 248 SKB_DROP_REASON_TCP_ACK_UNSENT_DATA, 249 /** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */ 250 SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE, 251 /** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */ 252 SKB_DROP_REASON_TCP_OFO_DROP, 253 /** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */ 254 SKB_DROP_REASON_IP_OUTNOROUTES, 255 /** 256 * @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB 257 * eBPF program 258 */ 259 SKB_DROP_REASON_BPF_CGROUP_EGRESS, 260 /** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */ 261 SKB_DROP_REASON_IPV6DISABLED, 262 /** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */ 263 SKB_DROP_REASON_NEIGH_CREATEFAIL, 264 /** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */ 265 SKB_DROP_REASON_NEIGH_FAILED, 266 /** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */ 267 SKB_DROP_REASON_NEIGH_QUEUEFULL, 268 /** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */ 269 SKB_DROP_REASON_NEIGH_DEAD, 270 /** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */ 271 SKB_DROP_REASON_TC_EGRESS, 272 /** 273 * @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting ( 274 * failed to enqueue to current qdisc) 275 */ 276 SKB_DROP_REASON_QDISC_DROP, 277 /** 278 * @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU 279 * backlog queue. This can be caused by backlog queue full (see 280 * netdev_max_backlog in net.rst) or RPS flow limit 281 */ 282 SKB_DROP_REASON_CPU_BACKLOG, 283 /** @SKB_DROP_REASON_XDP: dropped by XDP in input path */ 284 SKB_DROP_REASON_XDP, 285 /** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */ 286 SKB_DROP_REASON_TC_INGRESS, 287 /** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */ 288 SKB_DROP_REASON_UNHANDLED_PROTO, 289 /** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */ 290 SKB_DROP_REASON_SKB_CSUM, 291 /** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */ 292 SKB_DROP_REASON_SKB_GSO_SEG, 293 /** 294 * @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space, 295 * e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx() 296 */ 297 SKB_DROP_REASON_SKB_UCOPY_FAULT, 298 /** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */ 299 SKB_DROP_REASON_DEV_HDR, 300 /** 301 * @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to 302 * any of its data structure that is not up/ready/initialized, 303 * e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq] 304 * is not initialized 305 */ 306 SKB_DROP_REASON_DEV_READY, 307 /** @SKB_DROP_REASON_FULL_RING: ring buffer is full */ 308 SKB_DROP_REASON_FULL_RING, 309 /** @SKB_DROP_REASON_NOMEM: error due to OOM */ 310 SKB_DROP_REASON_NOMEM, 311 /** 312 * @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from 313 * networking data, e.g., failed to pull the protocol header from 314 * frags via pskb_may_pull() 315 */ 316 SKB_DROP_REASON_HDR_TRUNC, 317 /** 318 * @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached 319 * to tun/tap, e.g., via TUNSETFILTEREBPF 320 */ 321 SKB_DROP_REASON_TAP_FILTER, 322 /** 323 * @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at 324 * tun/tap, e.g., check_filter() 325 */ 326 SKB_DROP_REASON_TAP_TXFILTER, 327 /** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */ 328 SKB_DROP_REASON_ICMP_CSUM, 329 /** 330 * @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211, 331 * such as a broadcasts ICMP_TIMESTAMP 332 */ 333 SKB_DROP_REASON_INVALID_PROTO, 334 /** 335 * @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to 336 * IPSTATS_MIB_INADDRERRORS 337 */ 338 SKB_DROP_REASON_IP_INADDRERRORS, 339 /** 340 * @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to 341 * IPSTATS_MIB_INADDRERRORS 342 */ 343 SKB_DROP_REASON_IP_INNOROUTES, 344 /** 345 * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the 346 * MTU) 347 */ 348 SKB_DROP_REASON_PKT_TOO_BIG, 349 /** @SKB_DROP_REASON_DUP_FRAG: duplicate fragment */ 350 SKB_DROP_REASON_DUP_FRAG, 351 /** @SKB_DROP_REASON_FRAG_REASM_TIMEOUT: fragment reassembly timeout */ 352 SKB_DROP_REASON_FRAG_REASM_TIMEOUT, 353 /** 354 * @SKB_DROP_REASON_FRAG_TOO_FAR: ipv4 fragment too far. 355 * (/proc/sys/net/ipv4/ipfrag_max_dist) 356 */ 357 SKB_DROP_REASON_FRAG_TOO_FAR, 358 /** 359 * @SKB_DROP_REASON_TCP_MINTTL: ipv4 ttl or ipv6 hoplimit below 360 * the threshold (IP_MINTTL or IPV6_MINHOPCOUNT). 361 */ 362 SKB_DROP_REASON_TCP_MINTTL, 363 /** @SKB_DROP_REASON_IPV6_BAD_EXTHDR: Bad IPv6 extension header. */ 364 SKB_DROP_REASON_IPV6_BAD_EXTHDR, 365 /** @SKB_DROP_REASON_IPV6_NDISC_FRAG: invalid frag (suppress_frag_ndisc). */ 366 SKB_DROP_REASON_IPV6_NDISC_FRAG, 367 /** @SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT: invalid hop limit. */ 368 SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT, 369 /** @SKB_DROP_REASON_IPV6_NDISC_BAD_CODE: invalid NDISC icmp6 code. */ 370 SKB_DROP_REASON_IPV6_NDISC_BAD_CODE, 371 /** @SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS: invalid NDISC options. */ 372 SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS, 373 /** 374 * @SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST: NEIGHBOUR SOLICITATION 375 * for another host. 376 */ 377 SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST, 378 /** @SKB_DROP_REASON_QUEUE_PURGE: bulk free. */ 379 SKB_DROP_REASON_QUEUE_PURGE, 380 /** @SKB_DROP_REASON_TC_ERROR: generic internal tc error. */ 381 SKB_DROP_REASON_TC_ERROR, 382 /** 383 * @SKB_DROP_REASON_PACKET_SOCK_ERROR: generic packet socket errors 384 * after its filter matches an incoming packet. 385 */ 386 SKB_DROP_REASON_PACKET_SOCK_ERROR, 387 /** 388 * @SKB_DROP_REASON_MAX: the maximum of core drop reasons, which 389 * shouldn't be used as a real 'reason' - only for tracing code gen 390 */ 391 SKB_DROP_REASON_MAX, 392 393 /** 394 * @SKB_DROP_REASON_SUBSYS_MASK: subsystem mask in drop reasons, 395 * see &enum skb_drop_reason_subsys 396 */ 397 SKB_DROP_REASON_SUBSYS_MASK = 0xffff0000, 398 }; 399 400 #define SKB_DROP_REASON_SUBSYS_SHIFT 16 401 402 #define SKB_DR_INIT(name, reason) \ 403 enum skb_drop_reason name = SKB_DROP_REASON_##reason 404 #define SKB_DR(name) \ 405 SKB_DR_INIT(name, NOT_SPECIFIED) 406 #define SKB_DR_SET(name, reason) \ 407 (name = SKB_DROP_REASON_##reason) 408 #define SKB_DR_OR(name, reason) \ 409 do { \ 410 if (name == SKB_DROP_REASON_NOT_SPECIFIED || \ 411 name == SKB_NOT_DROPPED_YET) \ 412 SKB_DR_SET(name, reason); \ 413 } while (0) 414 415 #endif 416