1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 3 #ifndef _LINUX_DROPREASON_H 4 #define _LINUX_DROPREASON_H 5 6 /** 7 * enum skb_drop_reason - the reasons of skb drops 8 * 9 * The reason of skb drop, which is used in kfree_skb_reason(). 10 */ 11 enum skb_drop_reason { 12 /** 13 * @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case) 14 */ 15 SKB_NOT_DROPPED_YET = 0, 16 /** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */ 17 SKB_DROP_REASON_NOT_SPECIFIED, 18 /** @SKB_DROP_REASON_NO_SOCKET: socket not found */ 19 SKB_DROP_REASON_NO_SOCKET, 20 /** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */ 21 SKB_DROP_REASON_PKT_TOO_SMALL, 22 /** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */ 23 SKB_DROP_REASON_TCP_CSUM, 24 /** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */ 25 SKB_DROP_REASON_SOCKET_FILTER, 26 /** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */ 27 SKB_DROP_REASON_UDP_CSUM, 28 /** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */ 29 SKB_DROP_REASON_NETFILTER_DROP, 30 /** 31 * @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host 32 * (interface is in promisc mode) 33 */ 34 SKB_DROP_REASON_OTHERHOST, 35 /** @SKB_DROP_REASON_IP_CSUM: IP checksum error */ 36 SKB_DROP_REASON_IP_CSUM, 37 /** 38 * @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see 39 * IPSTATS_MIB_INHDRERRORS) 40 */ 41 SKB_DROP_REASON_IP_INHDR, 42 /** 43 * @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the 44 * document for rp_filter in ip-sysctl.rst for more information 45 */ 46 SKB_DROP_REASON_IP_RPFILTER, 47 /** 48 * @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is 49 * multicast, but L3 is unicast. 50 */ 51 SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST, 52 /** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */ 53 SKB_DROP_REASON_XFRM_POLICY, 54 /** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */ 55 SKB_DROP_REASON_IP_NOPROTO, 56 /** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */ 57 SKB_DROP_REASON_SOCKET_RCVBUFF, 58 /** 59 * @SKB_DROP_REASON_PROTO_MEM: proto memory limition, such as udp packet 60 * drop out of udp_memory_allocated. 61 */ 62 SKB_DROP_REASON_PROTO_MEM, 63 /** 64 * @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected, 65 * corresponding to LINUX_MIB_TCPMD5NOTFOUND 66 */ 67 SKB_DROP_REASON_TCP_MD5NOTFOUND, 68 /** 69 * @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting 70 * one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED 71 */ 72 SKB_DROP_REASON_TCP_MD5UNEXPECTED, 73 /** 74 * @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding 75 * to LINUX_MIB_TCPMD5FAILURE 76 */ 77 SKB_DROP_REASON_TCP_MD5FAILURE, 78 /** 79 * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog ( 80 * see LINUX_MIB_TCPBACKLOGDROP) 81 */ 82 SKB_DROP_REASON_SOCKET_BACKLOG, 83 /** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */ 84 SKB_DROP_REASON_TCP_FLAGS, 85 /** 86 * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero, 87 * see LINUX_MIB_TCPZEROWINDOWDROP 88 */ 89 SKB_DROP_REASON_TCP_ZEROWINDOW, 90 /** 91 * @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data reveived is already 92 * received before (spurious retrans may happened), see 93 * LINUX_MIB_DELAYEDACKLOST 94 */ 95 SKB_DROP_REASON_TCP_OLD_DATA, 96 /** 97 * @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window, 98 * the seq of the first byte exceed the right edges of receive 99 * window 100 */ 101 SKB_DROP_REASON_TCP_OVERWINDOW, 102 /** 103 * @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo 104 * queue, corresponding to LINUX_MIB_TCPOFOMERGE 105 */ 106 SKB_DROP_REASON_TCP_OFOMERGE, 107 /** 108 * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to 109 * LINUX_MIB_PAWSESTABREJECTED 110 */ 111 SKB_DROP_REASON_TCP_RFC7323_PAWS, 112 /** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */ 113 SKB_DROP_REASON_TCP_INVALID_SEQUENCE, 114 /** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */ 115 SKB_DROP_REASON_TCP_RESET, 116 /** 117 * @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected 118 * SYN flag 119 */ 120 SKB_DROP_REASON_TCP_INVALID_SYN, 121 /** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */ 122 SKB_DROP_REASON_TCP_CLOSE, 123 /** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */ 124 SKB_DROP_REASON_TCP_FASTOPEN, 125 /** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */ 126 SKB_DROP_REASON_TCP_OLD_ACK, 127 /** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */ 128 SKB_DROP_REASON_TCP_TOO_OLD_ACK, 129 /** 130 * @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't 131 * sent yet 132 */ 133 SKB_DROP_REASON_TCP_ACK_UNSENT_DATA, 134 /** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */ 135 SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE, 136 /** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */ 137 SKB_DROP_REASON_TCP_OFO_DROP, 138 /** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */ 139 SKB_DROP_REASON_IP_OUTNOROUTES, 140 /** 141 * @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB 142 * eBPF program 143 */ 144 SKB_DROP_REASON_BPF_CGROUP_EGRESS, 145 /** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */ 146 SKB_DROP_REASON_IPV6DISABLED, 147 /** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */ 148 SKB_DROP_REASON_NEIGH_CREATEFAIL, 149 /** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */ 150 SKB_DROP_REASON_NEIGH_FAILED, 151 /** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */ 152 SKB_DROP_REASON_NEIGH_QUEUEFULL, 153 /** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */ 154 SKB_DROP_REASON_NEIGH_DEAD, 155 /** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */ 156 SKB_DROP_REASON_TC_EGRESS, 157 /** 158 * @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting ( 159 * failed to enqueue to current qdisc) 160 */ 161 SKB_DROP_REASON_QDISC_DROP, 162 /** 163 * @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU 164 * backlog queue. This can be caused by backlog queue full (see 165 * netdev_max_backlog in net.rst) or RPS flow limit 166 */ 167 SKB_DROP_REASON_CPU_BACKLOG, 168 /** @SKB_DROP_REASON_XDP: dropped by XDP in input path */ 169 SKB_DROP_REASON_XDP, 170 /** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */ 171 SKB_DROP_REASON_TC_INGRESS, 172 /** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */ 173 SKB_DROP_REASON_UNHANDLED_PROTO, 174 /** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */ 175 SKB_DROP_REASON_SKB_CSUM, 176 /** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */ 177 SKB_DROP_REASON_SKB_GSO_SEG, 178 /** 179 * @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space, 180 * e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx() 181 */ 182 SKB_DROP_REASON_SKB_UCOPY_FAULT, 183 /** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */ 184 SKB_DROP_REASON_DEV_HDR, 185 /** 186 * @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to 187 * any of its data structure that is not up/ready/initialized, 188 * e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq] 189 * is not initialized 190 */ 191 SKB_DROP_REASON_DEV_READY, 192 /** @SKB_DROP_REASON_FULL_RING: ring buffer is full */ 193 SKB_DROP_REASON_FULL_RING, 194 /** @SKB_DROP_REASON_NOMEM: error due to OOM */ 195 SKB_DROP_REASON_NOMEM, 196 /** 197 * @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from 198 * networking data, e.g., failed to pull the protocol header from 199 * frags via pskb_may_pull() 200 */ 201 SKB_DROP_REASON_HDR_TRUNC, 202 /** 203 * @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached 204 * to tun/tap, e.g., via TUNSETFILTEREBPF 205 */ 206 SKB_DROP_REASON_TAP_FILTER, 207 /** 208 * @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at 209 * tun/tap, e.g., check_filter() 210 */ 211 SKB_DROP_REASON_TAP_TXFILTER, 212 /** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */ 213 SKB_DROP_REASON_ICMP_CSUM, 214 /** 215 * @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211, 216 * such as a broadcasts ICMP_TIMESTAMP 217 */ 218 SKB_DROP_REASON_INVALID_PROTO, 219 /** 220 * @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to 221 * IPSTATS_MIB_INADDRERRORS 222 */ 223 SKB_DROP_REASON_IP_INADDRERRORS, 224 /** 225 * @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to 226 * IPSTATS_MIB_INADDRERRORS 227 */ 228 SKB_DROP_REASON_IP_INNOROUTES, 229 /** 230 * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the 231 * MTU) 232 */ 233 SKB_DROP_REASON_PKT_TOO_BIG, 234 /** 235 * @SKB_DROP_REASON_MAX: the maximum of drop reason, which shouldn't be 236 * used as a real 'reason' 237 */ 238 SKB_DROP_REASON_MAX, 239 }; 240 241 #define SKB_DR_INIT(name, reason) \ 242 enum skb_drop_reason name = SKB_DROP_REASON_##reason 243 #define SKB_DR(name) \ 244 SKB_DR_INIT(name, NOT_SPECIFIED) 245 #define SKB_DR_SET(name, reason) \ 246 (name = SKB_DROP_REASON_##reason) 247 #define SKB_DR_OR(name, reason) \ 248 do { \ 249 if (name == SKB_DROP_REASON_NOT_SPECIFIED || \ 250 name == SKB_NOT_DROPPED_YET) \ 251 SKB_DR_SET(name, reason); \ 252 } while (0) 253 254 extern const char * const drop_reasons[]; 255 256 #endif 257