Menglong Dong | ff8372a | 2022-06-06 10:24:34 +0800 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 2 | |
| 3 | #ifndef _LINUX_DROPREASON_H |
| 4 | #define _LINUX_DROPREASON_H |
| 5 | |
Menglong Dong | 9cb252c4 | 2022-09-05 11:50:15 +0800 | [diff] [blame] | 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 | FNe(MAX) |
| 72 | |
Menglong Dong | b160f72 | 2022-06-06 10:24:36 +0800 | [diff] [blame] | 73 | /** |
| 74 | * enum skb_drop_reason - the reasons of skb drops |
Menglong Dong | ff8372a | 2022-06-06 10:24:34 +0800 | [diff] [blame] | 75 | * |
Menglong Dong | b160f72 | 2022-06-06 10:24:36 +0800 | [diff] [blame] | 76 | * The reason of skb drop, which is used in kfree_skb_reason(). |
Menglong Dong | ff8372a | 2022-06-06 10:24:34 +0800 | [diff] [blame] | 77 | */ |
| 78 | enum skb_drop_reason { |
Menglong Dong | b160f72 | 2022-06-06 10:24:36 +0800 | [diff] [blame] | 79 | /** |
| 80 | * @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case) |
| 81 | */ |
Menglong Dong | ff8372a | 2022-06-06 10:24:34 +0800 | [diff] [blame] | 82 | SKB_NOT_DROPPED_YET = 0, |
Menglong Dong | b160f72 | 2022-06-06 10:24:36 +0800 | [diff] [blame] | 83 | /** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */ |
| 84 | SKB_DROP_REASON_NOT_SPECIFIED, |
| 85 | /** @SKB_DROP_REASON_NO_SOCKET: socket not found */ |
| 86 | SKB_DROP_REASON_NO_SOCKET, |
| 87 | /** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */ |
| 88 | SKB_DROP_REASON_PKT_TOO_SMALL, |
| 89 | /** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */ |
| 90 | SKB_DROP_REASON_TCP_CSUM, |
| 91 | /** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */ |
| 92 | SKB_DROP_REASON_SOCKET_FILTER, |
| 93 | /** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */ |
| 94 | SKB_DROP_REASON_UDP_CSUM, |
| 95 | /** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */ |
| 96 | SKB_DROP_REASON_NETFILTER_DROP, |
| 97 | /** |
| 98 | * @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host |
| 99 | * (interface is in promisc mode) |
| 100 | */ |
| 101 | SKB_DROP_REASON_OTHERHOST, |
| 102 | /** @SKB_DROP_REASON_IP_CSUM: IP checksum error */ |
| 103 | SKB_DROP_REASON_IP_CSUM, |
| 104 | /** |
| 105 | * @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see |
| 106 | * IPSTATS_MIB_INHDRERRORS) |
| 107 | */ |
| 108 | SKB_DROP_REASON_IP_INHDR, |
| 109 | /** |
| 110 | * @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the |
| 111 | * document for rp_filter in ip-sysctl.rst for more information |
| 112 | */ |
| 113 | SKB_DROP_REASON_IP_RPFILTER, |
| 114 | /** |
| 115 | * @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is |
| 116 | * multicast, but L3 is unicast. |
| 117 | */ |
| 118 | SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST, |
| 119 | /** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */ |
| 120 | SKB_DROP_REASON_XFRM_POLICY, |
| 121 | /** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */ |
| 122 | SKB_DROP_REASON_IP_NOPROTO, |
| 123 | /** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */ |
| 124 | SKB_DROP_REASON_SOCKET_RCVBUFF, |
| 125 | /** |
| 126 | * @SKB_DROP_REASON_PROTO_MEM: proto memory limition, such as udp packet |
| 127 | * drop out of udp_memory_allocated. |
| 128 | */ |
| 129 | SKB_DROP_REASON_PROTO_MEM, |
| 130 | /** |
| 131 | * @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected, |
| 132 | * corresponding to LINUX_MIB_TCPMD5NOTFOUND |
| 133 | */ |
| 134 | SKB_DROP_REASON_TCP_MD5NOTFOUND, |
| 135 | /** |
| 136 | * @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting |
| 137 | * one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED |
| 138 | */ |
| 139 | SKB_DROP_REASON_TCP_MD5UNEXPECTED, |
| 140 | /** |
| 141 | * @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding |
| 142 | * to LINUX_MIB_TCPMD5FAILURE |
| 143 | */ |
| 144 | SKB_DROP_REASON_TCP_MD5FAILURE, |
| 145 | /** |
| 146 | * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog ( |
| 147 | * see LINUX_MIB_TCPBACKLOGDROP) |
| 148 | */ |
| 149 | SKB_DROP_REASON_SOCKET_BACKLOG, |
| 150 | /** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */ |
| 151 | SKB_DROP_REASON_TCP_FLAGS, |
| 152 | /** |
| 153 | * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero, |
| 154 | * see LINUX_MIB_TCPZEROWINDOWDROP |
| 155 | */ |
| 156 | SKB_DROP_REASON_TCP_ZEROWINDOW, |
| 157 | /** |
| 158 | * @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data reveived is already |
| 159 | * received before (spurious retrans may happened), see |
| 160 | * LINUX_MIB_DELAYEDACKLOST |
| 161 | */ |
| 162 | SKB_DROP_REASON_TCP_OLD_DATA, |
| 163 | /** |
| 164 | * @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window, |
| 165 | * the seq of the first byte exceed the right edges of receive |
| 166 | * window |
| 167 | */ |
| 168 | SKB_DROP_REASON_TCP_OVERWINDOW, |
| 169 | /** |
| 170 | * @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo |
| 171 | * queue, corresponding to LINUX_MIB_TCPOFOMERGE |
| 172 | */ |
| 173 | SKB_DROP_REASON_TCP_OFOMERGE, |
| 174 | /** |
| 175 | * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to |
| 176 | * LINUX_MIB_PAWSESTABREJECTED |
| 177 | */ |
| 178 | SKB_DROP_REASON_TCP_RFC7323_PAWS, |
| 179 | /** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */ |
| 180 | SKB_DROP_REASON_TCP_INVALID_SEQUENCE, |
| 181 | /** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */ |
| 182 | SKB_DROP_REASON_TCP_RESET, |
| 183 | /** |
| 184 | * @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected |
| 185 | * SYN flag |
| 186 | */ |
| 187 | SKB_DROP_REASON_TCP_INVALID_SYN, |
| 188 | /** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */ |
| 189 | SKB_DROP_REASON_TCP_CLOSE, |
| 190 | /** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */ |
| 191 | SKB_DROP_REASON_TCP_FASTOPEN, |
| 192 | /** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */ |
| 193 | SKB_DROP_REASON_TCP_OLD_ACK, |
| 194 | /** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */ |
| 195 | SKB_DROP_REASON_TCP_TOO_OLD_ACK, |
| 196 | /** |
| 197 | * @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't |
| 198 | * sent yet |
| 199 | */ |
| 200 | SKB_DROP_REASON_TCP_ACK_UNSENT_DATA, |
| 201 | /** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */ |
| 202 | SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE, |
| 203 | /** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */ |
| 204 | SKB_DROP_REASON_TCP_OFO_DROP, |
| 205 | /** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */ |
| 206 | SKB_DROP_REASON_IP_OUTNOROUTES, |
| 207 | /** |
| 208 | * @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB |
| 209 | * eBPF program |
| 210 | */ |
| 211 | SKB_DROP_REASON_BPF_CGROUP_EGRESS, |
| 212 | /** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */ |
| 213 | SKB_DROP_REASON_IPV6DISABLED, |
| 214 | /** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */ |
| 215 | SKB_DROP_REASON_NEIGH_CREATEFAIL, |
| 216 | /** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */ |
| 217 | SKB_DROP_REASON_NEIGH_FAILED, |
| 218 | /** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */ |
| 219 | SKB_DROP_REASON_NEIGH_QUEUEFULL, |
| 220 | /** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */ |
| 221 | SKB_DROP_REASON_NEIGH_DEAD, |
| 222 | /** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */ |
| 223 | SKB_DROP_REASON_TC_EGRESS, |
| 224 | /** |
| 225 | * @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting ( |
| 226 | * failed to enqueue to current qdisc) |
| 227 | */ |
| 228 | SKB_DROP_REASON_QDISC_DROP, |
| 229 | /** |
| 230 | * @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU |
| 231 | * backlog queue. This can be caused by backlog queue full (see |
| 232 | * netdev_max_backlog in net.rst) or RPS flow limit |
| 233 | */ |
| 234 | SKB_DROP_REASON_CPU_BACKLOG, |
| 235 | /** @SKB_DROP_REASON_XDP: dropped by XDP in input path */ |
| 236 | SKB_DROP_REASON_XDP, |
| 237 | /** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */ |
| 238 | SKB_DROP_REASON_TC_INGRESS, |
| 239 | /** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */ |
| 240 | SKB_DROP_REASON_UNHANDLED_PROTO, |
| 241 | /** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */ |
| 242 | SKB_DROP_REASON_SKB_CSUM, |
| 243 | /** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */ |
| 244 | SKB_DROP_REASON_SKB_GSO_SEG, |
| 245 | /** |
| 246 | * @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space, |
| 247 | * e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx() |
| 248 | */ |
| 249 | SKB_DROP_REASON_SKB_UCOPY_FAULT, |
| 250 | /** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */ |
| 251 | SKB_DROP_REASON_DEV_HDR, |
| 252 | /** |
| 253 | * @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to |
| 254 | * any of its data structure that is not up/ready/initialized, |
| 255 | * e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq] |
| 256 | * is not initialized |
Menglong Dong | ff8372a | 2022-06-06 10:24:34 +0800 | [diff] [blame] | 257 | */ |
| 258 | SKB_DROP_REASON_DEV_READY, |
Menglong Dong | b160f72 | 2022-06-06 10:24:36 +0800 | [diff] [blame] | 259 | /** @SKB_DROP_REASON_FULL_RING: ring buffer is full */ |
| 260 | SKB_DROP_REASON_FULL_RING, |
| 261 | /** @SKB_DROP_REASON_NOMEM: error due to OOM */ |
| 262 | SKB_DROP_REASON_NOMEM, |
| 263 | /** |
| 264 | * @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from |
| 265 | * networking data, e.g., failed to pull the protocol header from |
| 266 | * frags via pskb_may_pull() |
| 267 | */ |
| 268 | SKB_DROP_REASON_HDR_TRUNC, |
| 269 | /** |
| 270 | * @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached |
| 271 | * to tun/tap, e.g., via TUNSETFILTEREBPF |
| 272 | */ |
| 273 | SKB_DROP_REASON_TAP_FILTER, |
| 274 | /** |
| 275 | * @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at |
| 276 | * tun/tap, e.g., check_filter() |
| 277 | */ |
| 278 | SKB_DROP_REASON_TAP_TXFILTER, |
| 279 | /** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */ |
| 280 | SKB_DROP_REASON_ICMP_CSUM, |
| 281 | /** |
| 282 | * @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211, |
| 283 | * such as a broadcasts ICMP_TIMESTAMP |
| 284 | */ |
| 285 | SKB_DROP_REASON_INVALID_PROTO, |
| 286 | /** |
| 287 | * @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to |
| 288 | * IPSTATS_MIB_INADDRERRORS |
| 289 | */ |
| 290 | SKB_DROP_REASON_IP_INADDRERRORS, |
| 291 | /** |
| 292 | * @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to |
| 293 | * IPSTATS_MIB_INADDRERRORS |
| 294 | */ |
| 295 | SKB_DROP_REASON_IP_INNOROUTES, |
| 296 | /** |
| 297 | * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the |
| 298 | * MTU) |
| 299 | */ |
| 300 | SKB_DROP_REASON_PKT_TOO_BIG, |
| 301 | /** |
| 302 | * @SKB_DROP_REASON_MAX: the maximum of drop reason, which shouldn't be |
| 303 | * used as a real 'reason' |
| 304 | */ |
Menglong Dong | ff8372a | 2022-06-06 10:24:34 +0800 | [diff] [blame] | 305 | SKB_DROP_REASON_MAX, |
| 306 | }; |
| 307 | |
| 308 | #define SKB_DR_INIT(name, reason) \ |
| 309 | enum skb_drop_reason name = SKB_DROP_REASON_##reason |
| 310 | #define SKB_DR(name) \ |
| 311 | SKB_DR_INIT(name, NOT_SPECIFIED) |
| 312 | #define SKB_DR_SET(name, reason) \ |
| 313 | (name = SKB_DROP_REASON_##reason) |
| 314 | #define SKB_DR_OR(name, reason) \ |
| 315 | do { \ |
| 316 | if (name == SKB_DROP_REASON_NOT_SPECIFIED || \ |
| 317 | name == SKB_NOT_DROPPED_YET) \ |
| 318 | SKB_DR_SET(name, reason); \ |
| 319 | } while (0) |
| 320 | |
Menglong Dong | ec43908 | 2022-06-06 10:24:35 +0800 | [diff] [blame] | 321 | extern const char * const drop_reasons[]; |
| 322 | |
Menglong Dong | ff8372a | 2022-06-06 10:24:34 +0800 | [diff] [blame] | 323 | #endif |