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