1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 3 #ifndef _LINUX_DROPREASON_H 4 #define _LINUX_DROPREASON_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_INVALID_SEQUENCE) \ 34 FN(TCP_RESET) \ 35 FN(TCP_INVALID_SYN) \ 36 FN(TCP_CLOSE) \ 37 FN(TCP_FASTOPEN) \ 38 FN(TCP_OLD_ACK) \ 39 FN(TCP_TOO_OLD_ACK) \ 40 FN(TCP_ACK_UNSENT_DATA) \ 41 FN(TCP_OFO_QUEUE_PRUNE) \ 42 FN(TCP_OFO_DROP) \ 43 FN(IP_OUTNOROUTES) \ 44 FN(BPF_CGROUP_EGRESS) \ 45 FN(IPV6DISABLED) \ 46 FN(NEIGH_CREATEFAIL) \ 47 FN(NEIGH_FAILED) \ 48 FN(NEIGH_QUEUEFULL) \ 49 FN(NEIGH_DEAD) \ 50 FN(TC_EGRESS) \ 51 FN(QDISC_DROP) \ 52 FN(CPU_BACKLOG) \ 53 FN(XDP) \ 54 FN(TC_INGRESS) \ 55 FN(UNHANDLED_PROTO) \ 56 FN(SKB_CSUM) \ 57 FN(SKB_GSO_SEG) \ 58 FN(SKB_UCOPY_FAULT) \ 59 FN(DEV_HDR) \ 60 FN(DEV_READY) \ 61 FN(FULL_RING) \ 62 FN(NOMEM) \ 63 FN(HDR_TRUNC) \ 64 FN(TAP_FILTER) \ 65 FN(TAP_TXFILTER) \ 66 FN(ICMP_CSUM) \ 67 FN(INVALID_PROTO) \ 68 FN(IP_INADDRERRORS) \ 69 FN(IP_INNOROUTES) \ 70 FN(PKT_TOO_BIG) \ 71 FN(DUP_FRAG) \ 72 FN(FRAG_REASM_TIMEOUT) \ 73 FN(FRAG_TOO_FAR) \ 74 FN(TCP_MINTTL) \ 75 FNe(MAX) 76 77 /** 78 * enum skb_drop_reason - the reasons of skb drops 79 * 80 * The reason of skb drop, which is used in kfree_skb_reason(). 81 */ 82 enum skb_drop_reason { 83 /** 84 * @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case) 85 */ 86 SKB_NOT_DROPPED_YET = 0, 87 /** @SKB_CONSUMED: packet has been consumed */ 88 SKB_CONSUMED, 89 /** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */ 90 SKB_DROP_REASON_NOT_SPECIFIED, 91 /** @SKB_DROP_REASON_NO_SOCKET: socket not found */ 92 SKB_DROP_REASON_NO_SOCKET, 93 /** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */ 94 SKB_DROP_REASON_PKT_TOO_SMALL, 95 /** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */ 96 SKB_DROP_REASON_TCP_CSUM, 97 /** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */ 98 SKB_DROP_REASON_SOCKET_FILTER, 99 /** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */ 100 SKB_DROP_REASON_UDP_CSUM, 101 /** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */ 102 SKB_DROP_REASON_NETFILTER_DROP, 103 /** 104 * @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host 105 * (interface is in promisc mode) 106 */ 107 SKB_DROP_REASON_OTHERHOST, 108 /** @SKB_DROP_REASON_IP_CSUM: IP checksum error */ 109 SKB_DROP_REASON_IP_CSUM, 110 /** 111 * @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see 112 * IPSTATS_MIB_INHDRERRORS) 113 */ 114 SKB_DROP_REASON_IP_INHDR, 115 /** 116 * @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the 117 * document for rp_filter in ip-sysctl.rst for more information 118 */ 119 SKB_DROP_REASON_IP_RPFILTER, 120 /** 121 * @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is 122 * multicast, but L3 is unicast. 123 */ 124 SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST, 125 /** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */ 126 SKB_DROP_REASON_XFRM_POLICY, 127 /** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */ 128 SKB_DROP_REASON_IP_NOPROTO, 129 /** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */ 130 SKB_DROP_REASON_SOCKET_RCVBUFF, 131 /** 132 * @SKB_DROP_REASON_PROTO_MEM: proto memory limition, such as udp packet 133 * drop out of udp_memory_allocated. 134 */ 135 SKB_DROP_REASON_PROTO_MEM, 136 /** 137 * @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected, 138 * corresponding to LINUX_MIB_TCPMD5NOTFOUND 139 */ 140 SKB_DROP_REASON_TCP_MD5NOTFOUND, 141 /** 142 * @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting 143 * one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED 144 */ 145 SKB_DROP_REASON_TCP_MD5UNEXPECTED, 146 /** 147 * @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding 148 * to LINUX_MIB_TCPMD5FAILURE 149 */ 150 SKB_DROP_REASON_TCP_MD5FAILURE, 151 /** 152 * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog ( 153 * see LINUX_MIB_TCPBACKLOGDROP) 154 */ 155 SKB_DROP_REASON_SOCKET_BACKLOG, 156 /** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */ 157 SKB_DROP_REASON_TCP_FLAGS, 158 /** 159 * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero, 160 * see LINUX_MIB_TCPZEROWINDOWDROP 161 */ 162 SKB_DROP_REASON_TCP_ZEROWINDOW, 163 /** 164 * @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data reveived is already 165 * received before (spurious retrans may happened), see 166 * LINUX_MIB_DELAYEDACKLOST 167 */ 168 SKB_DROP_REASON_TCP_OLD_DATA, 169 /** 170 * @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window, 171 * the seq of the first byte exceed the right edges of receive 172 * window 173 */ 174 SKB_DROP_REASON_TCP_OVERWINDOW, 175 /** 176 * @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo 177 * queue, corresponding to LINUX_MIB_TCPOFOMERGE 178 */ 179 SKB_DROP_REASON_TCP_OFOMERGE, 180 /** 181 * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to 182 * LINUX_MIB_PAWSESTABREJECTED 183 */ 184 SKB_DROP_REASON_TCP_RFC7323_PAWS, 185 /** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */ 186 SKB_DROP_REASON_TCP_INVALID_SEQUENCE, 187 /** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */ 188 SKB_DROP_REASON_TCP_RESET, 189 /** 190 * @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected 191 * SYN flag 192 */ 193 SKB_DROP_REASON_TCP_INVALID_SYN, 194 /** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */ 195 SKB_DROP_REASON_TCP_CLOSE, 196 /** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */ 197 SKB_DROP_REASON_TCP_FASTOPEN, 198 /** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */ 199 SKB_DROP_REASON_TCP_OLD_ACK, 200 /** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */ 201 SKB_DROP_REASON_TCP_TOO_OLD_ACK, 202 /** 203 * @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't 204 * sent yet 205 */ 206 SKB_DROP_REASON_TCP_ACK_UNSENT_DATA, 207 /** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */ 208 SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE, 209 /** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */ 210 SKB_DROP_REASON_TCP_OFO_DROP, 211 /** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */ 212 SKB_DROP_REASON_IP_OUTNOROUTES, 213 /** 214 * @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB 215 * eBPF program 216 */ 217 SKB_DROP_REASON_BPF_CGROUP_EGRESS, 218 /** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */ 219 SKB_DROP_REASON_IPV6DISABLED, 220 /** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */ 221 SKB_DROP_REASON_NEIGH_CREATEFAIL, 222 /** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */ 223 SKB_DROP_REASON_NEIGH_FAILED, 224 /** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */ 225 SKB_DROP_REASON_NEIGH_QUEUEFULL, 226 /** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */ 227 SKB_DROP_REASON_NEIGH_DEAD, 228 /** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */ 229 SKB_DROP_REASON_TC_EGRESS, 230 /** 231 * @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting ( 232 * failed to enqueue to current qdisc) 233 */ 234 SKB_DROP_REASON_QDISC_DROP, 235 /** 236 * @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU 237 * backlog queue. This can be caused by backlog queue full (see 238 * netdev_max_backlog in net.rst) or RPS flow limit 239 */ 240 SKB_DROP_REASON_CPU_BACKLOG, 241 /** @SKB_DROP_REASON_XDP: dropped by XDP in input path */ 242 SKB_DROP_REASON_XDP, 243 /** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */ 244 SKB_DROP_REASON_TC_INGRESS, 245 /** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */ 246 SKB_DROP_REASON_UNHANDLED_PROTO, 247 /** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */ 248 SKB_DROP_REASON_SKB_CSUM, 249 /** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */ 250 SKB_DROP_REASON_SKB_GSO_SEG, 251 /** 252 * @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space, 253 * e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx() 254 */ 255 SKB_DROP_REASON_SKB_UCOPY_FAULT, 256 /** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */ 257 SKB_DROP_REASON_DEV_HDR, 258 /** 259 * @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to 260 * any of its data structure that is not up/ready/initialized, 261 * e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq] 262 * is not initialized 263 */ 264 SKB_DROP_REASON_DEV_READY, 265 /** @SKB_DROP_REASON_FULL_RING: ring buffer is full */ 266 SKB_DROP_REASON_FULL_RING, 267 /** @SKB_DROP_REASON_NOMEM: error due to OOM */ 268 SKB_DROP_REASON_NOMEM, 269 /** 270 * @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from 271 * networking data, e.g., failed to pull the protocol header from 272 * frags via pskb_may_pull() 273 */ 274 SKB_DROP_REASON_HDR_TRUNC, 275 /** 276 * @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached 277 * to tun/tap, e.g., via TUNSETFILTEREBPF 278 */ 279 SKB_DROP_REASON_TAP_FILTER, 280 /** 281 * @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at 282 * tun/tap, e.g., check_filter() 283 */ 284 SKB_DROP_REASON_TAP_TXFILTER, 285 /** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */ 286 SKB_DROP_REASON_ICMP_CSUM, 287 /** 288 * @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211, 289 * such as a broadcasts ICMP_TIMESTAMP 290 */ 291 SKB_DROP_REASON_INVALID_PROTO, 292 /** 293 * @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to 294 * IPSTATS_MIB_INADDRERRORS 295 */ 296 SKB_DROP_REASON_IP_INADDRERRORS, 297 /** 298 * @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to 299 * IPSTATS_MIB_INADDRERRORS 300 */ 301 SKB_DROP_REASON_IP_INNOROUTES, 302 /** 303 * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the 304 * MTU) 305 */ 306 SKB_DROP_REASON_PKT_TOO_BIG, 307 /** @SKB_DROP_REASON_DUP_FRAG: duplicate fragment */ 308 SKB_DROP_REASON_DUP_FRAG, 309 /** @SKB_DROP_REASON_FRAG_REASM_TIMEOUT: fragment reassembly timeout */ 310 SKB_DROP_REASON_FRAG_REASM_TIMEOUT, 311 /** 312 * @SKB_DROP_REASON_FRAG_TOO_FAR: ipv4 fragment too far. 313 * (/proc/sys/net/ipv4/ipfrag_max_dist) 314 */ 315 SKB_DROP_REASON_FRAG_TOO_FAR, 316 /** 317 * @SKB_DROP_REASON_TCP_MINTTL: ipv4 ttl or ipv6 hoplimit below 318 * the threshold (IP_MINTTL or IPV6_MINHOPCOUNT). 319 */ 320 SKB_DROP_REASON_TCP_MINTTL, 321 /** 322 * @SKB_DROP_REASON_MAX: the maximum of drop reason, which shouldn't be 323 * used as a real 'reason' 324 */ 325 SKB_DROP_REASON_MAX, 326 }; 327 328 #define SKB_DR_INIT(name, reason) \ 329 enum skb_drop_reason name = SKB_DROP_REASON_##reason 330 #define SKB_DR(name) \ 331 SKB_DR_INIT(name, NOT_SPECIFIED) 332 #define SKB_DR_SET(name, reason) \ 333 (name = SKB_DROP_REASON_##reason) 334 #define SKB_DR_OR(name, reason) \ 335 do { \ 336 if (name == SKB_DROP_REASON_NOT_SPECIFIED || \ 337 name == SKB_NOT_DROPPED_YET) \ 338 SKB_DR_SET(name, reason); \ 339 } while (0) 340 341 extern const char * const drop_reasons[]; 342 343 #endif 344