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