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