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