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_COOKIE_ERROR)             \
  89         FN(PACKET_SOCK_ERROR)           \
  90         FN(TC_CHAIN_NOTFOUND)           \
  91         FN(TC_RECLASSIFY_LOOP)          \
  92         FNe(MAX)
  93
  94 /**
  95  * enum skb_drop_reason - the reasons of skb drops
  96  *
  97  * The reason of skb drop, which is used in kfree_skb_reason().
  98  */
  99 enum skb_drop_reason {
 100         /**
 101          * @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case)
 102          */
 103         SKB_NOT_DROPPED_YET = 0,
 104         /** @SKB_CONSUMED: packet has been consumed */
 105         SKB_CONSUMED,
 106         /** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */
 107         SKB_DROP_REASON_NOT_SPECIFIED,
 108         /** @SKB_DROP_REASON_NO_SOCKET: socket not found */
 109         SKB_DROP_REASON_NO_SOCKET,
 110         /** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */
 111         SKB_DROP_REASON_PKT_TOO_SMALL,
 112         /** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */
 113         SKB_DROP_REASON_TCP_CSUM,
 114         /** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */
 115         SKB_DROP_REASON_SOCKET_FILTER,
 116         /** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */
 117         SKB_DROP_REASON_UDP_CSUM,
 118         /** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */
 119         SKB_DROP_REASON_NETFILTER_DROP,
 120         /**
 121          * @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host
 122          * (interface is in promisc mode)
 123          */
 124         SKB_DROP_REASON_OTHERHOST,
 125         /** @SKB_DROP_REASON_IP_CSUM: IP checksum error */
 126         SKB_DROP_REASON_IP_CSUM,
 127         /**
 128          * @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see
 129          * IPSTATS_MIB_INHDRERRORS)
 130          */
 131         SKB_DROP_REASON_IP_INHDR,
 132         /**
 133          * @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the
 134          * document for rp_filter in ip-sysctl.rst for more information
 135          */
 136         SKB_DROP_REASON_IP_RPFILTER,
 137         /**
 138          * @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is
 139          * multicast, but L3 is unicast.
 140          */
 141         SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST,
 142         /** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */
 143         SKB_DROP_REASON_XFRM_POLICY,
 144         /** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */
 145         SKB_DROP_REASON_IP_NOPROTO,
 146         /** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */
 147         SKB_DROP_REASON_SOCKET_RCVBUFF,
 148         /**
 149          * @SKB_DROP_REASON_PROTO_MEM: proto memory limition, such as udp packet
 150          * drop out of udp_memory_allocated.
 151          */
 152         SKB_DROP_REASON_PROTO_MEM,
 153         /**
 154          * @SKB_DROP_REASON_TCP_AUTH_HDR: TCP-MD5 or TCP-AO hashes are met
 155          * twice or set incorrectly.
 156          */
 157         SKB_DROP_REASON_TCP_AUTH_HDR,
 158         /**
 159          * @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected,
 160          * corresponding to LINUX_MIB_TCPMD5NOTFOUND
 161          */
 162         SKB_DROP_REASON_TCP_MD5NOTFOUND,
 163         /**
 164          * @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting
 165          * one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED
 166          */
 167         SKB_DROP_REASON_TCP_MD5UNEXPECTED,
 168         /**
 169          * @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding
 170          * to LINUX_MIB_TCPMD5FAILURE
 171          */
 172         SKB_DROP_REASON_TCP_MD5FAILURE,
 173         /**
 174          * @SKB_DROP_REASON_TCP_AONOTFOUND: no TCP-AO hash and one was expected,
 175          * corresponding to LINUX_MIB_TCPAOREQUIRED
 176          */
 177         SKB_DROP_REASON_TCP_AONOTFOUND,
 178         /**
 179          * @SKB_DROP_REASON_TCP_AOUNEXPECTED: TCP-AO hash is present and it
 180          * was not expected, corresponding to LINUX_MIB_TCPAOKEYNOTFOUND
 181          */
 182         SKB_DROP_REASON_TCP_AOUNEXPECTED,
 183         /**
 184          * @SKB_DROP_REASON_TCP_AOKEYNOTFOUND: TCP-AO key is unknown,
 185          * corresponding to LINUX_MIB_TCPAOKEYNOTFOUND
 186          */
 187         SKB_DROP_REASON_TCP_AOKEYNOTFOUND,
 188         /**
 189          * @SKB_DROP_REASON_TCP_AOFAILURE: TCP-AO hash is wrong,
 190          * corresponding to LINUX_MIB_TCPAOBAD
 191          */
 192         SKB_DROP_REASON_TCP_AOFAILURE,
 193         /**
 194          * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog (
 195          * see LINUX_MIB_TCPBACKLOGDROP)
 196          */
 197         SKB_DROP_REASON_SOCKET_BACKLOG,
 198         /** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */
 199         SKB_DROP_REASON_TCP_FLAGS,
 200         /**
 201          * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero,
 202          * see LINUX_MIB_TCPZEROWINDOWDROP
 203          */
 204         SKB_DROP_REASON_TCP_ZEROWINDOW,
 205         /**
 206          * @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data reveived is already
 207          * received before (spurious retrans may happened), see
 208          * LINUX_MIB_DELAYEDACKLOST
 209          */
 210         SKB_DROP_REASON_TCP_OLD_DATA,
 211         /**
 212          * @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window,
 213          * the seq of the first byte exceed the right edges of receive
 214          * window
 215          */
 216         SKB_DROP_REASON_TCP_OVERWINDOW,
 217         /**
 218          * @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo
 219          * queue, corresponding to LINUX_MIB_TCPOFOMERGE
 220          */
 221         SKB_DROP_REASON_TCP_OFOMERGE,
 222         /**
 223          * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to
 224          * LINUX_MIB_PAWSESTABREJECTED
 225          */
 226         SKB_DROP_REASON_TCP_RFC7323_PAWS,
 227         /** @SKB_DROP_REASON_TCP_OLD_SEQUENCE: Old SEQ field (duplicate packet) */
 228         SKB_DROP_REASON_TCP_OLD_SEQUENCE,
 229         /** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */
 230         SKB_DROP_REASON_TCP_INVALID_SEQUENCE,
 231         /** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */
 232         SKB_DROP_REASON_TCP_RESET,
 233         /**
 234          * @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected
 235          * SYN flag
 236          */
 237         SKB_DROP_REASON_TCP_INVALID_SYN,
 238         /** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */
 239         SKB_DROP_REASON_TCP_CLOSE,
 240         /** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */
 241         SKB_DROP_REASON_TCP_FASTOPEN,
 242         /** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */
 243         SKB_DROP_REASON_TCP_OLD_ACK,
 244         /** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */
 245         SKB_DROP_REASON_TCP_TOO_OLD_ACK,
 246         /**
 247          * @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't
 248          * sent yet
 249          */
 250         SKB_DROP_REASON_TCP_ACK_UNSENT_DATA,
 251         /** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */
 252         SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE,
 253         /** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */
 254         SKB_DROP_REASON_TCP_OFO_DROP,
 255         /** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */
 256         SKB_DROP_REASON_IP_OUTNOROUTES,
 257         /**
 258          * @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB
 259          * eBPF program
 260          */
 261         SKB_DROP_REASON_BPF_CGROUP_EGRESS,
 262         /** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */
 263         SKB_DROP_REASON_IPV6DISABLED,
 264         /** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */
 265         SKB_DROP_REASON_NEIGH_CREATEFAIL,
 266         /** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */
 267         SKB_DROP_REASON_NEIGH_FAILED,
 268         /** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */
 269         SKB_DROP_REASON_NEIGH_QUEUEFULL,
 270         /** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */
 271         SKB_DROP_REASON_NEIGH_DEAD,
 272         /** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */
 273         SKB_DROP_REASON_TC_EGRESS,
 274         /**
 275          * @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting (
 276          * failed to enqueue to current qdisc)
 277          */
 278         SKB_DROP_REASON_QDISC_DROP,
 279         /**
 280          * @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU
 281          * backlog queue. This can be caused by backlog queue full (see
 282          * netdev_max_backlog in net.rst) or RPS flow limit
 283          */
 284         SKB_DROP_REASON_CPU_BACKLOG,
 285         /** @SKB_DROP_REASON_XDP: dropped by XDP in input path */
 286         SKB_DROP_REASON_XDP,
 287         /** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */
 288         SKB_DROP_REASON_TC_INGRESS,
 289         /** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */
 290         SKB_DROP_REASON_UNHANDLED_PROTO,
 291         /** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */
 292         SKB_DROP_REASON_SKB_CSUM,
 293         /** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */
 294         SKB_DROP_REASON_SKB_GSO_SEG,
 295         /**
 296          * @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space,
 297          * e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx()
 298          */
 299         SKB_DROP_REASON_SKB_UCOPY_FAULT,
 300         /** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */
 301         SKB_DROP_REASON_DEV_HDR,
 302         /**
 303          * @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to
 304          * any of its data structure that is not up/ready/initialized,
 305          * e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq]
 306          * is not initialized
 307          */
 308         SKB_DROP_REASON_DEV_READY,
 309         /** @SKB_DROP_REASON_FULL_RING: ring buffer is full */
 310         SKB_DROP_REASON_FULL_RING,
 311         /** @SKB_DROP_REASON_NOMEM: error due to OOM */
 312         SKB_DROP_REASON_NOMEM,
 313         /**
 314          * @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from
 315          * networking data, e.g., failed to pull the protocol header from
 316          * frags via pskb_may_pull()
 317          */
 318         SKB_DROP_REASON_HDR_TRUNC,
 319         /**
 320          * @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached
 321          * to tun/tap, e.g., via TUNSETFILTEREBPF
 322          */
 323         SKB_DROP_REASON_TAP_FILTER,
 324         /**
 325          * @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at
 326          * tun/tap, e.g., check_filter()
 327          */
 328         SKB_DROP_REASON_TAP_TXFILTER,
 329         /** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */
 330         SKB_DROP_REASON_ICMP_CSUM,
 331         /**
 332          * @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211,
 333          * such as a broadcasts ICMP_TIMESTAMP
 334          */
 335         SKB_DROP_REASON_INVALID_PROTO,
 336         /**
 337          * @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to
 338          * IPSTATS_MIB_INADDRERRORS
 339          */
 340         SKB_DROP_REASON_IP_INADDRERRORS,
 341         /**
 342          * @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to
 343          * IPSTATS_MIB_INADDRERRORS
 344          */
 345         SKB_DROP_REASON_IP_INNOROUTES,
 346         /**
 347          * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the
 348          * MTU)
 349          */
 350         SKB_DROP_REASON_PKT_TOO_BIG,
 351         /** @SKB_DROP_REASON_DUP_FRAG: duplicate fragment */
 352         SKB_DROP_REASON_DUP_FRAG,
 353         /** @SKB_DROP_REASON_FRAG_REASM_TIMEOUT: fragment reassembly timeout */
 354         SKB_DROP_REASON_FRAG_REASM_TIMEOUT,
 355         /**
 356          * @SKB_DROP_REASON_FRAG_TOO_FAR: ipv4 fragment too far.
 357          * (/proc/sys/net/ipv4/ipfrag_max_dist)
 358          */
 359         SKB_DROP_REASON_FRAG_TOO_FAR,
 360         /**
 361          * @SKB_DROP_REASON_TCP_MINTTL: ipv4 ttl or ipv6 hoplimit below
 362          * the threshold (IP_MINTTL or IPV6_MINHOPCOUNT).
 363          */
 364         SKB_DROP_REASON_TCP_MINTTL,
 365         /** @SKB_DROP_REASON_IPV6_BAD_EXTHDR: Bad IPv6 extension header. */
 366         SKB_DROP_REASON_IPV6_BAD_EXTHDR,
 367         /** @SKB_DROP_REASON_IPV6_NDISC_FRAG: invalid frag (suppress_frag_ndisc). */
 368         SKB_DROP_REASON_IPV6_NDISC_FRAG,
 369         /** @SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT: invalid hop limit. */
 370         SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT,
 371         /** @SKB_DROP_REASON_IPV6_NDISC_BAD_CODE: invalid NDISC icmp6 code. */
 372         SKB_DROP_REASON_IPV6_NDISC_BAD_CODE,
 373         /** @SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS: invalid NDISC options. */
 374         SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS,
 375         /**
 376          * @SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST: NEIGHBOUR SOLICITATION
 377          * for another host.
 378          */
 379         SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST,
 380         /** @SKB_DROP_REASON_QUEUE_PURGE: bulk free. */
 381         SKB_DROP_REASON_QUEUE_PURGE,
 382         /**
 383          * @SKB_DROP_REASON_TC_COOKIE_ERROR: An error occurred whilst
 384          * processing a tc ext cookie.
 385          */
 386         SKB_DROP_REASON_TC_COOKIE_ERROR,
 387         /**
 388          * @SKB_DROP_REASON_PACKET_SOCK_ERROR: generic packet socket errors
 389          * after its filter matches an incoming packet.
 390          */
 391         SKB_DROP_REASON_PACKET_SOCK_ERROR,
 392         /** @SKB_DROP_REASON_TC_CHAIN_NOTFOUND: tc chain lookup failed. */
 393         SKB_DROP_REASON_TC_CHAIN_NOTFOUND,
 394         /**
 395          * @SKB_DROP_REASON_TC_RECLASSIFY_LOOP: tc exceeded max reclassify loop
 396          * iterations.
 397          */
 398         SKB_DROP_REASON_TC_RECLASSIFY_LOOP,
 399         /**
 400          * @SKB_DROP_REASON_MAX: the maximum of core drop reasons, which
 401          * shouldn't be used as a real 'reason' - only for tracing code gen
 402          */
 403         SKB_DROP_REASON_MAX,
 404
 405         /**
 406          * @SKB_DROP_REASON_SUBSYS_MASK: subsystem mask in drop reasons,
 407          * see &enum skb_drop_reason_subsys
 408          */
 409         SKB_DROP_REASON_SUBSYS_MASK = 0xffff0000,
 410 };
 411
 412 #define SKB_DROP_REASON_SUBSYS_SHIFT    16
 413
 414 #define SKB_DR_INIT(name, reason)                               \
 415         enum skb_drop_reason name = SKB_DROP_REASON_##reason
 416 #define SKB_DR(name)                                            \
 417         SKB_DR_INIT(name, NOT_SPECIFIED)
 418 #define SKB_DR_SET(name, reason)                                \
 419         (name = SKB_DROP_REASON_##reason)
 420 #define SKB_DR_OR(name, reason)                                 \
 421         do {                                                    \
 422                 if (name == SKB_DROP_REASON_NOT_SPECIFIED ||    \
 423                     name == SKB_NOT_DROPPED_YET)                \
 424                         SKB_DR_SET(name, reason);               \
 425         } while (0)
 426
 427 #endif