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0001 /* SPDX-License-Identifier: GPL-2.0-or-later */ 0002 0003 #ifndef _LINUX_DROPREASON_H 0004 #define _LINUX_DROPREASON_H 0005 0006 #define DEFINE_DROP_REASON(FN, FNe) \ 0007 FN(NOT_SPECIFIED) \ 0008 FN(NO_SOCKET) \ 0009 FN(PKT_TOO_SMALL) \ 0010 FN(TCP_CSUM) \ 0011 FN(SOCKET_FILTER) \ 0012 FN(UDP_CSUM) \ 0013 FN(NETFILTER_DROP) \ 0014 FN(OTHERHOST) \ 0015 FN(IP_CSUM) \ 0016 FN(IP_INHDR) \ 0017 FN(IP_RPFILTER) \ 0018 FN(UNICAST_IN_L2_MULTICAST) \ 0019 FN(XFRM_POLICY) \ 0020 FN(IP_NOPROTO) \ 0021 FN(SOCKET_RCVBUFF) \ 0022 FN(PROTO_MEM) \ 0023 FN(TCP_MD5NOTFOUND) \ 0024 FN(TCP_MD5UNEXPECTED) \ 0025 FN(TCP_MD5FAILURE) \ 0026 FN(SOCKET_BACKLOG) \ 0027 FN(TCP_FLAGS) \ 0028 FN(TCP_ZEROWINDOW) \ 0029 FN(TCP_OLD_DATA) \ 0030 FN(TCP_OVERWINDOW) \ 0031 FN(TCP_OFOMERGE) \ 0032 FN(TCP_RFC7323_PAWS) \ 0033 FN(TCP_INVALID_SEQUENCE) \ 0034 FN(TCP_RESET) \ 0035 FN(TCP_INVALID_SYN) \ 0036 FN(TCP_CLOSE) \ 0037 FN(TCP_FASTOPEN) \ 0038 FN(TCP_OLD_ACK) \ 0039 FN(TCP_TOO_OLD_ACK) \ 0040 FN(TCP_ACK_UNSENT_DATA) \ 0041 FN(TCP_OFO_QUEUE_PRUNE) \ 0042 FN(TCP_OFO_DROP) \ 0043 FN(IP_OUTNOROUTES) \ 0044 FN(BPF_CGROUP_EGRESS) \ 0045 FN(IPV6DISABLED) \ 0046 FN(NEIGH_CREATEFAIL) \ 0047 FN(NEIGH_FAILED) \ 0048 FN(NEIGH_QUEUEFULL) \ 0049 FN(NEIGH_DEAD) \ 0050 FN(TC_EGRESS) \ 0051 FN(QDISC_DROP) \ 0052 FN(CPU_BACKLOG) \ 0053 FN(XDP) \ 0054 FN(TC_INGRESS) \ 0055 FN(UNHANDLED_PROTO) \ 0056 FN(SKB_CSUM) \ 0057 FN(SKB_GSO_SEG) \ 0058 FN(SKB_UCOPY_FAULT) \ 0059 FN(DEV_HDR) \ 0060 FN(DEV_READY) \ 0061 FN(FULL_RING) \ 0062 FN(NOMEM) \ 0063 FN(HDR_TRUNC) \ 0064 FN(TAP_FILTER) \ 0065 FN(TAP_TXFILTER) \ 0066 FN(ICMP_CSUM) \ 0067 FN(INVALID_PROTO) \ 0068 FN(IP_INADDRERRORS) \ 0069 FN(IP_INNOROUTES) \ 0070 FN(PKT_TOO_BIG) \ 0071 FNe(MAX) 0072 0073 /** 0074 * enum skb_drop_reason - the reasons of skb drops 0075 * 0076 * The reason of skb drop, which is used in kfree_skb_reason(). 0077 */ 0078 enum skb_drop_reason { 0079 /** 0080 * @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case) 0081 */ 0082 SKB_NOT_DROPPED_YET = 0, 0083 /** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */ 0084 SKB_DROP_REASON_NOT_SPECIFIED, 0085 /** @SKB_DROP_REASON_NO_SOCKET: socket not found */ 0086 SKB_DROP_REASON_NO_SOCKET, 0087 /** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */ 0088 SKB_DROP_REASON_PKT_TOO_SMALL, 0089 /** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */ 0090 SKB_DROP_REASON_TCP_CSUM, 0091 /** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */ 0092 SKB_DROP_REASON_SOCKET_FILTER, 0093 /** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */ 0094 SKB_DROP_REASON_UDP_CSUM, 0095 /** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */ 0096 SKB_DROP_REASON_NETFILTER_DROP, 0097 /** 0098 * @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host 0099 * (interface is in promisc mode) 0100 */ 0101 SKB_DROP_REASON_OTHERHOST, 0102 /** @SKB_DROP_REASON_IP_CSUM: IP checksum error */ 0103 SKB_DROP_REASON_IP_CSUM, 0104 /** 0105 * @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see 0106 * IPSTATS_MIB_INHDRERRORS) 0107 */ 0108 SKB_DROP_REASON_IP_INHDR, 0109 /** 0110 * @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the 0111 * document for rp_filter in ip-sysctl.rst for more information 0112 */ 0113 SKB_DROP_REASON_IP_RPFILTER, 0114 /** 0115 * @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is 0116 * multicast, but L3 is unicast. 0117 */ 0118 SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST, 0119 /** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */ 0120 SKB_DROP_REASON_XFRM_POLICY, 0121 /** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */ 0122 SKB_DROP_REASON_IP_NOPROTO, 0123 /** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */ 0124 SKB_DROP_REASON_SOCKET_RCVBUFF, 0125 /** 0126 * @SKB_DROP_REASON_PROTO_MEM: proto memory limition, such as udp packet 0127 * drop out of udp_memory_allocated. 0128 */ 0129 SKB_DROP_REASON_PROTO_MEM, 0130 /** 0131 * @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected, 0132 * corresponding to LINUX_MIB_TCPMD5NOTFOUND 0133 */ 0134 SKB_DROP_REASON_TCP_MD5NOTFOUND, 0135 /** 0136 * @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting 0137 * one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED 0138 */ 0139 SKB_DROP_REASON_TCP_MD5UNEXPECTED, 0140 /** 0141 * @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding 0142 * to LINUX_MIB_TCPMD5FAILURE 0143 */ 0144 SKB_DROP_REASON_TCP_MD5FAILURE, 0145 /** 0146 * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog ( 0147 * see LINUX_MIB_TCPBACKLOGDROP) 0148 */ 0149 SKB_DROP_REASON_SOCKET_BACKLOG, 0150 /** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */ 0151 SKB_DROP_REASON_TCP_FLAGS, 0152 /** 0153 * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero, 0154 * see LINUX_MIB_TCPZEROWINDOWDROP 0155 */ 0156 SKB_DROP_REASON_TCP_ZEROWINDOW, 0157 /** 0158 * @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data reveived is already 0159 * received before (spurious retrans may happened), see 0160 * LINUX_MIB_DELAYEDACKLOST 0161 */ 0162 SKB_DROP_REASON_TCP_OLD_DATA, 0163 /** 0164 * @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window, 0165 * the seq of the first byte exceed the right edges of receive 0166 * window 0167 */ 0168 SKB_DROP_REASON_TCP_OVERWINDOW, 0169 /** 0170 * @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo 0171 * queue, corresponding to LINUX_MIB_TCPOFOMERGE 0172 */ 0173 SKB_DROP_REASON_TCP_OFOMERGE, 0174 /** 0175 * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to 0176 * LINUX_MIB_PAWSESTABREJECTED 0177 */ 0178 SKB_DROP_REASON_TCP_RFC7323_PAWS, 0179 /** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */ 0180 SKB_DROP_REASON_TCP_INVALID_SEQUENCE, 0181 /** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */ 0182 SKB_DROP_REASON_TCP_RESET, 0183 /** 0184 * @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected 0185 * SYN flag 0186 */ 0187 SKB_DROP_REASON_TCP_INVALID_SYN, 0188 /** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */ 0189 SKB_DROP_REASON_TCP_CLOSE, 0190 /** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */ 0191 SKB_DROP_REASON_TCP_FASTOPEN, 0192 /** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */ 0193 SKB_DROP_REASON_TCP_OLD_ACK, 0194 /** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */ 0195 SKB_DROP_REASON_TCP_TOO_OLD_ACK, 0196 /** 0197 * @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't 0198 * sent yet 0199 */ 0200 SKB_DROP_REASON_TCP_ACK_UNSENT_DATA, 0201 /** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */ 0202 SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE, 0203 /** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */ 0204 SKB_DROP_REASON_TCP_OFO_DROP, 0205 /** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */ 0206 SKB_DROP_REASON_IP_OUTNOROUTES, 0207 /** 0208 * @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB 0209 * eBPF program 0210 */ 0211 SKB_DROP_REASON_BPF_CGROUP_EGRESS, 0212 /** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */ 0213 SKB_DROP_REASON_IPV6DISABLED, 0214 /** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */ 0215 SKB_DROP_REASON_NEIGH_CREATEFAIL, 0216 /** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */ 0217 SKB_DROP_REASON_NEIGH_FAILED, 0218 /** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */ 0219 SKB_DROP_REASON_NEIGH_QUEUEFULL, 0220 /** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */ 0221 SKB_DROP_REASON_NEIGH_DEAD, 0222 /** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */ 0223 SKB_DROP_REASON_TC_EGRESS, 0224 /** 0225 * @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting ( 0226 * failed to enqueue to current qdisc) 0227 */ 0228 SKB_DROP_REASON_QDISC_DROP, 0229 /** 0230 * @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU 0231 * backlog queue. This can be caused by backlog queue full (see 0232 * netdev_max_backlog in net.rst) or RPS flow limit 0233 */ 0234 SKB_DROP_REASON_CPU_BACKLOG, 0235 /** @SKB_DROP_REASON_XDP: dropped by XDP in input path */ 0236 SKB_DROP_REASON_XDP, 0237 /** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */ 0238 SKB_DROP_REASON_TC_INGRESS, 0239 /** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */ 0240 SKB_DROP_REASON_UNHANDLED_PROTO, 0241 /** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */ 0242 SKB_DROP_REASON_SKB_CSUM, 0243 /** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */ 0244 SKB_DROP_REASON_SKB_GSO_SEG, 0245 /** 0246 * @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space, 0247 * e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx() 0248 */ 0249 SKB_DROP_REASON_SKB_UCOPY_FAULT, 0250 /** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */ 0251 SKB_DROP_REASON_DEV_HDR, 0252 /** 0253 * @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to 0254 * any of its data structure that is not up/ready/initialized, 0255 * e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq] 0256 * is not initialized 0257 */ 0258 SKB_DROP_REASON_DEV_READY, 0259 /** @SKB_DROP_REASON_FULL_RING: ring buffer is full */ 0260 SKB_DROP_REASON_FULL_RING, 0261 /** @SKB_DROP_REASON_NOMEM: error due to OOM */ 0262 SKB_DROP_REASON_NOMEM, 0263 /** 0264 * @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from 0265 * networking data, e.g., failed to pull the protocol header from 0266 * frags via pskb_may_pull() 0267 */ 0268 SKB_DROP_REASON_HDR_TRUNC, 0269 /** 0270 * @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached 0271 * to tun/tap, e.g., via TUNSETFILTEREBPF 0272 */ 0273 SKB_DROP_REASON_TAP_FILTER, 0274 /** 0275 * @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at 0276 * tun/tap, e.g., check_filter() 0277 */ 0278 SKB_DROP_REASON_TAP_TXFILTER, 0279 /** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */ 0280 SKB_DROP_REASON_ICMP_CSUM, 0281 /** 0282 * @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211, 0283 * such as a broadcasts ICMP_TIMESTAMP 0284 */ 0285 SKB_DROP_REASON_INVALID_PROTO, 0286 /** 0287 * @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to 0288 * IPSTATS_MIB_INADDRERRORS 0289 */ 0290 SKB_DROP_REASON_IP_INADDRERRORS, 0291 /** 0292 * @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to 0293 * IPSTATS_MIB_INADDRERRORS 0294 */ 0295 SKB_DROP_REASON_IP_INNOROUTES, 0296 /** 0297 * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the 0298 * MTU) 0299 */ 0300 SKB_DROP_REASON_PKT_TOO_BIG, 0301 /** 0302 * @SKB_DROP_REASON_MAX: the maximum of drop reason, which shouldn't be 0303 * used as a real 'reason' 0304 */ 0305 SKB_DROP_REASON_MAX, 0306 }; 0307 0308 #define SKB_DR_INIT(name, reason) \ 0309 enum skb_drop_reason name = SKB_DROP_REASON_##reason 0310 #define SKB_DR(name) \ 0311 SKB_DR_INIT(name, NOT_SPECIFIED) 0312 #define SKB_DR_SET(name, reason) \ 0313 (name = SKB_DROP_REASON_##reason) 0314 #define SKB_DR_OR(name, reason) \ 0315 do { \ 0316 if (name == SKB_DROP_REASON_NOT_SPECIFIED || \ 0317 name == SKB_NOT_DROPPED_YET) \ 0318 SKB_DR_SET(name, reason); \ 0319 } while (0) 0320 0321 extern const char * const drop_reasons[]; 0322 0323 #endif
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