include/net/dropreason.h

   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         FNe(MAX)
  72
  73 /**
  74  * enum skb_drop_reason - the reasons of skb drops
  75  *
  76  * The reason of skb drop, which is used in kfree_skb_reason().
  77  */
  78 enum skb_drop_reason {
  79         /**
  80          * @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case)
  81          */
  82         SKB_NOT_DROPPED_YET = 0,
  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
 257          */
 258         SKB_DROP_REASON_DEV_READY,
 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          */
 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
 321 extern const char * const drop_reasons[];
 322
 323 #endif