include/net/dropreason-core.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2
   3 #ifndef _LINUX_DROPREASON_CORE_H
   4 #define _LINUX_DROPREASON_CORE_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_AUTH_HDR)                \
  24         FN(TCP_MD5NOTFOUND)             \
  25         FN(TCP_MD5UNEXPECTED)           \
  26         FN(TCP_MD5FAILURE)              \
  27         FN(TCP_AONOTFOUND)              \
  28         FN(TCP_AOUNEXPECTED)            \
  29         FN(TCP_AOKEYNOTFOUND)           \
  30         FN(TCP_AOFAILURE)               \
  31         FN(SOCKET_BACKLOG)              \
  32         FN(TCP_FLAGS)                   \
  33         FN(TCP_ZEROWINDOW)              \
  34         FN(TCP_OLD_DATA)                \
  35         FN(TCP_OVERWINDOW)              \
  36         FN(TCP_OFOMERGE)                \
  37         FN(TCP_RFC7323_PAWS)            \
  38         FN(TCP_OLD_SEQUENCE)            \
  39         FN(TCP_INVALID_SEQUENCE)        \
  40         FN(TCP_RESET)                   \
  41         FN(TCP_INVALID_SYN)             \
  42         FN(TCP_CLOSE)                   \
  43         FN(TCP_FASTOPEN)                \
  44         FN(TCP_OLD_ACK)                 \
  45         FN(TCP_TOO_OLD_ACK)             \
  46         FN(TCP_ACK_UNSENT_DATA)         \
  47         FN(TCP_OFO_QUEUE_PRUNE)         \
  48         FN(TCP_OFO_DROP)                \
  49         FN(IP_OUTNOROUTES)              \
  50         FN(BPF_CGROUP_EGRESS)           \
  51         FN(IPV6DISABLED)                \
  52         FN(NEIGH_CREATEFAIL)            \
  53         FN(NEIGH_FAILED)                \
  54         FN(NEIGH_QUEUEFULL)             \
  55         FN(NEIGH_DEAD)                  \
  56         FN(TC_EGRESS)                   \
  57         FN(QDISC_DROP)                  \
  58         FN(CPU_BACKLOG)                 \
  59         FN(XDP)                         \
  60         FN(TC_INGRESS)                  \
  61         FN(UNHANDLED_PROTO)             \
  62         FN(SKB_CSUM)                    \
  63         FN(SKB_GSO_SEG)                 \
  64         FN(SKB_UCOPY_FAULT)             \
  65         FN(DEV_HDR)                     \
  66         FN(DEV_READY)                   \
  67         FN(FULL_RING)                   \
  68         FN(NOMEM)                       \
  69         FN(HDR_TRUNC)                   \
  70         FN(TAP_FILTER)                  \
  71         FN(TAP_TXFILTER)                \
  72         FN(ICMP_CSUM)                   \
  73         FN(INVALID_PROTO)               \
  74         FN(IP_INADDRERRORS)             \
  75         FN(IP_INNOROUTES)               \
  76         FN(PKT_TOO_BIG)                 \
  77         FN(DUP_FRAG)                    \
  78         FN(FRAG_REASM_TIMEOUT)          \
  79         FN(FRAG_TOO_FAR)                \
  80         FN(TCP_MINTTL)                  \
  81         FN(IPV6_BAD_EXTHDR)             \
  82         FN(IPV6_NDISC_FRAG)             \
  83         FN(IPV6_NDISC_HOP_LIMIT)        \
  84         FN(IPV6_NDISC_BAD_CODE)         \
  85         FN(IPV6_NDISC_BAD_OPTIONS)      \
  86         FN(IPV6_NDISC_NS_OTHERHOST)     \
  87         FN(QUEUE_PURGE)                 \
  88         FN(TC_ERROR)                    \
  89         FNe(MAX)
  90
  91 /**
  92  * enum skb_drop_reason - the reasons of skb drops
  93  *
  94  * The reason of skb drop, which is used in kfree_skb_reason().
  95  */
  96 enum skb_drop_reason {
  97         /**
  98          * @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case)
  99          */
 100         SKB_NOT_DROPPED_YET = 0,
 101         /** @SKB_CONSUMED: packet has been consumed */
 102         SKB_CONSUMED,
 103         /** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */
 104         SKB_DROP_REASON_NOT_SPECIFIED,
 105         /** @SKB_DROP_REASON_NO_SOCKET: socket not found */
 106         SKB_DROP_REASON_NO_SOCKET,
 107         /** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */
 108         SKB_DROP_REASON_PKT_TOO_SMALL,
 109         /** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */
 110         SKB_DROP_REASON_TCP_CSUM,
 111         /** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */
 112         SKB_DROP_REASON_SOCKET_FILTER,
 113         /** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */
 114         SKB_DROP_REASON_UDP_CSUM,
 115         /** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */
 116         SKB_DROP_REASON_NETFILTER_DROP,
 117         /**
 118          * @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host
 119          * (interface is in promisc mode)
 120          */
 121         SKB_DROP_REASON_OTHERHOST,
 122         /** @SKB_DROP_REASON_IP_CSUM: IP checksum error */
 123         SKB_DROP_REASON_IP_CSUM,
 124         /**
 125          * @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see
 126          * IPSTATS_MIB_INHDRERRORS)
 127          */
 128         SKB_DROP_REASON_IP_INHDR,
 129         /**
 130          * @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the
 131          * document for rp_filter in ip-sysctl.rst for more information
 132          */
 133         SKB_DROP_REASON_IP_RPFILTER,
 134         /**
 135          * @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is
 136          * multicast, but L3 is unicast.
 137          */
 138         SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST,
 139         /** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */
 140         SKB_DROP_REASON_XFRM_POLICY,
 141         /** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */
 142         SKB_DROP_REASON_IP_NOPROTO,
 143         /** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */
 144         SKB_DROP_REASON_SOCKET_RCVBUFF,
 145         /**
 146          * @SKB_DROP_REASON_PROTO_MEM: proto memory limition, such as udp packet
 147          * drop out of udp_memory_allocated.
 148          */
 149         SKB_DROP_REASON_PROTO_MEM,
 150         /**
 151          * @SKB_DROP_REASON_TCP_AUTH_HDR: TCP-MD5 or TCP-AO hashes are met
 152          * twice or set incorrectly.
 153          */
 154         SKB_DROP_REASON_TCP_AUTH_HDR,
 155         /**
 156          * @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected,
 157          * corresponding to LINUX_MIB_TCPMD5NOTFOUND
 158          */
 159         SKB_DROP_REASON_TCP_MD5NOTFOUND,
 160         /**
 161          * @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting
 162          * one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED
 163          */
 164         SKB_DROP_REASON_TCP_MD5UNEXPECTED,
 165         /**
 166          * @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding
 167          * to LINUX_MIB_TCPMD5FAILURE
 168          */
 169         SKB_DROP_REASON_TCP_MD5FAILURE,
 170         /**
 171          * @SKB_DROP_REASON_TCP_AONOTFOUND: no TCP-AO hash and one was expected,
 172          * corresponding to LINUX_MIB_TCPAOREQUIRED
 173          */
 174         SKB_DROP_REASON_TCP_AONOTFOUND,
 175         /**
 176          * @SKB_DROP_REASON_TCP_AOUNEXPECTED: TCP-AO hash is present and it
 177          * was not expected, corresponding to LINUX_MIB_TCPAOKEYNOTFOUND
 178          */
 179         SKB_DROP_REASON_TCP_AOUNEXPECTED,
 180         /**
 181          * @SKB_DROP_REASON_TCP_AOKEYNOTFOUND: TCP-AO key is unknown,
 182          * corresponding to LINUX_MIB_TCPAOKEYNOTFOUND
 183          */
 184         SKB_DROP_REASON_TCP_AOKEYNOTFOUND,
 185         /**
 186          * @SKB_DROP_REASON_TCP_AOFAILURE: TCP-AO hash is wrong,
 187          * corresponding to LINUX_MIB_TCPAOBAD
 188          */
 189         SKB_DROP_REASON_TCP_AOFAILURE,
 190         /**
 191          * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog (
 192          * see LINUX_MIB_TCPBACKLOGDROP)
 193          */
 194         SKB_DROP_REASON_SOCKET_BACKLOG,
 195         /** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */
 196         SKB_DROP_REASON_TCP_FLAGS,
 197         /**
 198          * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero,
 199          * see LINUX_MIB_TCPZEROWINDOWDROP
 200          */
 201         SKB_DROP_REASON_TCP_ZEROWINDOW,
 202         /**
 203          * @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data reveived is already
 204          * received before (spurious retrans may happened), see
 205          * LINUX_MIB_DELAYEDACKLOST
 206          */
 207         SKB_DROP_REASON_TCP_OLD_DATA,
 208         /**
 209          * @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window,
 210          * the seq of the first byte exceed the right edges of receive
 211          * window
 212          */
 213         SKB_DROP_REASON_TCP_OVERWINDOW,
 214         /**
 215          * @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo
 216          * queue, corresponding to LINUX_MIB_TCPOFOMERGE
 217          */
 218         SKB_DROP_REASON_TCP_OFOMERGE,
 219         /**
 220          * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to
 221          * LINUX_MIB_PAWSESTABREJECTED
 222          */
 223         SKB_DROP_REASON_TCP_RFC7323_PAWS,
 224         /** @SKB_DROP_REASON_TCP_OLD_SEQUENCE: Old SEQ field (duplicate packet) */
 225         SKB_DROP_REASON_TCP_OLD_SEQUENCE,
 226         /** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */
 227         SKB_DROP_REASON_TCP_INVALID_SEQUENCE,
 228         /** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */
 229         SKB_DROP_REASON_TCP_RESET,
 230         /**
 231          * @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected
 232          * SYN flag
 233          */
 234         SKB_DROP_REASON_TCP_INVALID_SYN,
 235         /** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */
 236         SKB_DROP_REASON_TCP_CLOSE,
 237         /** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */
 238         SKB_DROP_REASON_TCP_FASTOPEN,
 239         /** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */
 240         SKB_DROP_REASON_TCP_OLD_ACK,
 241         /** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */
 242         SKB_DROP_REASON_TCP_TOO_OLD_ACK,
 243         /**
 244          * @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't
 245          * sent yet
 246          */
 247         SKB_DROP_REASON_TCP_ACK_UNSENT_DATA,
 248         /** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */
 249         SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE,
 250         /** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */
 251         SKB_DROP_REASON_TCP_OFO_DROP,
 252         /** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */
 253         SKB_DROP_REASON_IP_OUTNOROUTES,
 254         /**
 255          * @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB
 256          * eBPF program
 257          */
 258         SKB_DROP_REASON_BPF_CGROUP_EGRESS,
 259         /** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */
 260         SKB_DROP_REASON_IPV6DISABLED,
 261         /** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */
 262         SKB_DROP_REASON_NEIGH_CREATEFAIL,
 263         /** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */
 264         SKB_DROP_REASON_NEIGH_FAILED,
 265         /** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */
 266         SKB_DROP_REASON_NEIGH_QUEUEFULL,
 267         /** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */
 268         SKB_DROP_REASON_NEIGH_DEAD,
 269         /** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */
 270         SKB_DROP_REASON_TC_EGRESS,
 271         /**
 272          * @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting (
 273          * failed to enqueue to current qdisc)
 274          */
 275         SKB_DROP_REASON_QDISC_DROP,
 276         /**
 277          * @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU
 278          * backlog queue. This can be caused by backlog queue full (see
 279          * netdev_max_backlog in net.rst) or RPS flow limit
 280          */
 281         SKB_DROP_REASON_CPU_BACKLOG,
 282         /** @SKB_DROP_REASON_XDP: dropped by XDP in input path */
 283         SKB_DROP_REASON_XDP,
 284         /** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */
 285         SKB_DROP_REASON_TC_INGRESS,
 286         /** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */
 287         SKB_DROP_REASON_UNHANDLED_PROTO,
 288         /** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */
 289         SKB_DROP_REASON_SKB_CSUM,
 290         /** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */
 291         SKB_DROP_REASON_SKB_GSO_SEG,
 292         /**
 293          * @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space,
 294          * e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx()
 295          */
 296         SKB_DROP_REASON_SKB_UCOPY_FAULT,
 297         /** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */
 298         SKB_DROP_REASON_DEV_HDR,
 299         /**
 300          * @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to
 301          * any of its data structure that is not up/ready/initialized,
 302          * e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq]
 303          * is not initialized
 304          */
 305         SKB_DROP_REASON_DEV_READY,
 306         /** @SKB_DROP_REASON_FULL_RING: ring buffer is full */
 307         SKB_DROP_REASON_FULL_RING,
 308         /** @SKB_DROP_REASON_NOMEM: error due to OOM */
 309         SKB_DROP_REASON_NOMEM,
 310         /**
 311          * @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from
 312          * networking data, e.g., failed to pull the protocol header from
 313          * frags via pskb_may_pull()
 314          */
 315         SKB_DROP_REASON_HDR_TRUNC,
 316         /**
 317          * @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached
 318          * to tun/tap, e.g., via TUNSETFILTEREBPF
 319          */
 320         SKB_DROP_REASON_TAP_FILTER,
 321         /**
 322          * @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at
 323          * tun/tap, e.g., check_filter()
 324          */
 325         SKB_DROP_REASON_TAP_TXFILTER,
 326         /** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */
 327         SKB_DROP_REASON_ICMP_CSUM,
 328         /**
 329          * @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211,
 330          * such as a broadcasts ICMP_TIMESTAMP
 331          */
 332         SKB_DROP_REASON_INVALID_PROTO,
 333         /**
 334          * @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to
 335          * IPSTATS_MIB_INADDRERRORS
 336          */
 337         SKB_DROP_REASON_IP_INADDRERRORS,
 338         /**
 339          * @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to
 340          * IPSTATS_MIB_INADDRERRORS
 341          */
 342         SKB_DROP_REASON_IP_INNOROUTES,
 343         /**
 344          * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the
 345          * MTU)
 346          */
 347         SKB_DROP_REASON_PKT_TOO_BIG,
 348         /** @SKB_DROP_REASON_DUP_FRAG: duplicate fragment */
 349         SKB_DROP_REASON_DUP_FRAG,
 350         /** @SKB_DROP_REASON_FRAG_REASM_TIMEOUT: fragment reassembly timeout */
 351         SKB_DROP_REASON_FRAG_REASM_TIMEOUT,
 352         /**
 353          * @SKB_DROP_REASON_FRAG_TOO_FAR: ipv4 fragment too far.
 354          * (/proc/sys/net/ipv4/ipfrag_max_dist)
 355          */
 356         SKB_DROP_REASON_FRAG_TOO_FAR,
 357         /**
 358          * @SKB_DROP_REASON_TCP_MINTTL: ipv4 ttl or ipv6 hoplimit below
 359          * the threshold (IP_MINTTL or IPV6_MINHOPCOUNT).
 360          */
 361         SKB_DROP_REASON_TCP_MINTTL,
 362         /** @SKB_DROP_REASON_IPV6_BAD_EXTHDR: Bad IPv6 extension header. */
 363         SKB_DROP_REASON_IPV6_BAD_EXTHDR,
 364         /** @SKB_DROP_REASON_IPV6_NDISC_FRAG: invalid frag (suppress_frag_ndisc). */
 365         SKB_DROP_REASON_IPV6_NDISC_FRAG,
 366         /** @SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT: invalid hop limit. */
 367         SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT,
 368         /** @SKB_DROP_REASON_IPV6_NDISC_BAD_CODE: invalid NDISC icmp6 code. */
 369         SKB_DROP_REASON_IPV6_NDISC_BAD_CODE,
 370         /** @SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS: invalid NDISC options. */
 371         SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS,
 372         /**
 373          * @SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST: NEIGHBOUR SOLICITATION
 374          * for another host.
 375          */
 376         SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST,
 377         /** @SKB_DROP_REASON_QUEUE_PURGE: bulk free. */
 378         SKB_DROP_REASON_QUEUE_PURGE,
 379         /** @SKB_DROP_REASON_TC_ERROR: generic internal tc error. */
 380         SKB_DROP_REASON_TC_ERROR,
 381         /**
 382          * @SKB_DROP_REASON_MAX: the maximum of core drop reasons, which
 383          * shouldn't be used as a real 'reason' - only for tracing code gen
 384          */
 385         SKB_DROP_REASON_MAX,
 386
 387         /**
 388          * @SKB_DROP_REASON_SUBSYS_MASK: subsystem mask in drop reasons,
 389          * see &enum skb_drop_reason_subsys
 390          */
 391         SKB_DROP_REASON_SUBSYS_MASK = 0xffff0000,
 392 };
 393
 394 #define SKB_DROP_REASON_SUBSYS_SHIFT    16
 395
 396 #define SKB_DR_INIT(name, reason)                               \
 397         enum skb_drop_reason name = SKB_DROP_REASON_##reason
 398 #define SKB_DR(name)                                            \
 399         SKB_DR_INIT(name, NOT_SPECIFIED)
 400 #define SKB_DR_SET(name, reason)                                \
 401         (name = SKB_DROP_REASON_##reason)
 402 #define SKB_DR_OR(name, reason)                                 \
 403         do {                                                    \
 404                 if (name == SKB_DROP_REASON_NOT_SPECIFIED ||    \
 405                     name == SKB_NOT_DROPPED_YET)                \
 406                         SKB_DR_SET(name, reason);               \
 407         } while (0)
 408
 409 #endif