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_ABORT_ON_DATA)           \
  34         FN(TCP_ZEROWINDOW)              \
  35         FN(TCP_OLD_DATA)                \
  36         FN(TCP_OVERWINDOW)              \
  37         FN(TCP_OFOMERGE)                \
  38         FN(TCP_RFC7323_PAWS)            \
  39         FN(TCP_OLD_SEQUENCE)            \
  40         FN(TCP_INVALID_SEQUENCE)        \
  41         FN(TCP_INVALID_ACK_SEQUENCE)    \
  42         FN(TCP_RESET)                   \
  43         FN(TCP_INVALID_SYN)             \
  44         FN(TCP_CLOSE)                   \
  45         FN(TCP_FASTOPEN)                \
  46         FN(TCP_OLD_ACK)                 \
  47         FN(TCP_TOO_OLD_ACK)             \
  48         FN(TCP_ACK_UNSENT_DATA)         \
  49         FN(TCP_OFO_QUEUE_PRUNE)         \
  50         FN(TCP_OFO_DROP)                \
  51         FN(IP_OUTNOROUTES)              \
  52         FN(BPF_CGROUP_EGRESS)           \
  53         FN(IPV6DISABLED)                \
  54         FN(NEIGH_CREATEFAIL)            \
  55         FN(NEIGH_FAILED)                \
  56         FN(NEIGH_QUEUEFULL)             \
  57         FN(NEIGH_DEAD)                  \
  58         FN(TC_EGRESS)                   \
  59         FN(SECURITY_HOOK)               \
  60         FN(QDISC_DROP)                  \
  61         FN(CPU_BACKLOG)                 \
  62         FN(XDP)                         \
  63         FN(TC_INGRESS)                  \
  64         FN(UNHANDLED_PROTO)             \
  65         FN(SKB_CSUM)                    \
  66         FN(SKB_GSO_SEG)                 \
  67         FN(SKB_UCOPY_FAULT)             \
  68         FN(DEV_HDR)                     \
  69         FN(DEV_READY)                   \
  70         FN(FULL_RING)                   \
  71         FN(NOMEM)                       \
  72         FN(HDR_TRUNC)                   \
  73         FN(TAP_FILTER)                  \
  74         FN(TAP_TXFILTER)                \
  75         FN(ICMP_CSUM)                   \
  76         FN(INVALID_PROTO)               \
  77         FN(IP_INADDRERRORS)             \
  78         FN(IP_INNOROUTES)               \
  79         FN(PKT_TOO_BIG)                 \
  80         FN(DUP_FRAG)                    \
  81         FN(FRAG_REASM_TIMEOUT)          \
  82         FN(FRAG_TOO_FAR)                \
  83         FN(TCP_MINTTL)                  \
  84         FN(IPV6_BAD_EXTHDR)             \
  85         FN(IPV6_NDISC_FRAG)             \
  86         FN(IPV6_NDISC_HOP_LIMIT)        \
  87         FN(IPV6_NDISC_BAD_CODE)         \
  88         FN(IPV6_NDISC_BAD_OPTIONS)      \
  89         FN(IPV6_NDISC_NS_OTHERHOST)     \
  90         FN(QUEUE_PURGE)                 \
  91         FN(TC_COOKIE_ERROR)             \
  92         FN(PACKET_SOCK_ERROR)           \
  93         FN(TC_CHAIN_NOTFOUND)           \
  94         FN(TC_RECLASSIFY_LOOP)          \
  95         FNe(MAX)
  96
  97 /**
  98  * enum skb_drop_reason - the reasons of skb drops
  99  *
 100  * The reason of skb drop, which is used in kfree_skb_reason().
 101  */
 102 enum skb_drop_reason {
 103         /**
 104          * @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case)
 105          */
 106         SKB_NOT_DROPPED_YET = 0,
 107         /** @SKB_CONSUMED: packet has been consumed */
 108         SKB_CONSUMED,
 109         /** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */
 110         SKB_DROP_REASON_NOT_SPECIFIED,
 111         /**
 112          * @SKB_DROP_REASON_NO_SOCKET: no valid socket that can be used.
 113          * Reason could be one of three cases:
 114          * 1) no established/listening socket found during lookup process
 115          * 2) no valid request socket during 3WHS process
 116          * 3) no valid child socket during 3WHS process
 117          */
 118         SKB_DROP_REASON_NO_SOCKET,
 119         /** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */
 120         SKB_DROP_REASON_PKT_TOO_SMALL,
 121         /** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */
 122         SKB_DROP_REASON_TCP_CSUM,
 123         /** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */
 124         SKB_DROP_REASON_SOCKET_FILTER,
 125         /** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */
 126         SKB_DROP_REASON_UDP_CSUM,
 127         /** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */
 128         SKB_DROP_REASON_NETFILTER_DROP,
 129         /**
 130          * @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host
 131          * (interface is in promisc mode)
 132          */
 133         SKB_DROP_REASON_OTHERHOST,
 134         /** @SKB_DROP_REASON_IP_CSUM: IP checksum error */
 135         SKB_DROP_REASON_IP_CSUM,
 136         /**
 137          * @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see
 138          * IPSTATS_MIB_INHDRERRORS)
 139          */
 140         SKB_DROP_REASON_IP_INHDR,
 141         /**
 142          * @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the
 143          * document for rp_filter in ip-sysctl.rst for more information
 144          */
 145         SKB_DROP_REASON_IP_RPFILTER,
 146         /**
 147          * @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is
 148          * multicast, but L3 is unicast.
 149          */
 150         SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST,
 151         /** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */
 152         SKB_DROP_REASON_XFRM_POLICY,
 153         /** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */
 154         SKB_DROP_REASON_IP_NOPROTO,
 155         /** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */
 156         SKB_DROP_REASON_SOCKET_RCVBUFF,
 157         /**
 158          * @SKB_DROP_REASON_PROTO_MEM: proto memory limition, such as udp packet
 159          * drop out of udp_memory_allocated.
 160          */
 161         SKB_DROP_REASON_PROTO_MEM,
 162         /**
 163          * @SKB_DROP_REASON_TCP_AUTH_HDR: TCP-MD5 or TCP-AO hashes are met
 164          * twice or set incorrectly.
 165          */
 166         SKB_DROP_REASON_TCP_AUTH_HDR,
 167         /**
 168          * @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected,
 169          * corresponding to LINUX_MIB_TCPMD5NOTFOUND
 170          */
 171         SKB_DROP_REASON_TCP_MD5NOTFOUND,
 172         /**
 173          * @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting
 174          * one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED
 175          */
 176         SKB_DROP_REASON_TCP_MD5UNEXPECTED,
 177         /**
 178          * @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding
 179          * to LINUX_MIB_TCPMD5FAILURE
 180          */
 181         SKB_DROP_REASON_TCP_MD5FAILURE,
 182         /**
 183          * @SKB_DROP_REASON_TCP_AONOTFOUND: no TCP-AO hash and one was expected,
 184          * corresponding to LINUX_MIB_TCPAOREQUIRED
 185          */
 186         SKB_DROP_REASON_TCP_AONOTFOUND,
 187         /**
 188          * @SKB_DROP_REASON_TCP_AOUNEXPECTED: TCP-AO hash is present and it
 189          * was not expected, corresponding to LINUX_MIB_TCPAOKEYNOTFOUND
 190          */
 191         SKB_DROP_REASON_TCP_AOUNEXPECTED,
 192         /**
 193          * @SKB_DROP_REASON_TCP_AOKEYNOTFOUND: TCP-AO key is unknown,
 194          * corresponding to LINUX_MIB_TCPAOKEYNOTFOUND
 195          */
 196         SKB_DROP_REASON_TCP_AOKEYNOTFOUND,
 197         /**
 198          * @SKB_DROP_REASON_TCP_AOFAILURE: TCP-AO hash is wrong,
 199          * corresponding to LINUX_MIB_TCPAOBAD
 200          */
 201         SKB_DROP_REASON_TCP_AOFAILURE,
 202         /**
 203          * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog (
 204          * see LINUX_MIB_TCPBACKLOGDROP)
 205          */
 206         SKB_DROP_REASON_SOCKET_BACKLOG,
 207         /** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */
 208         SKB_DROP_REASON_TCP_FLAGS,
 209         /**
 210          * @SKB_DROP_REASON_TCP_ABORT_ON_DATA: abort on data, corresponding to
 211          * LINUX_MIB_TCPABORTONDATA
 212          */
 213         SKB_DROP_REASON_TCP_ABORT_ON_DATA,
 214         /**
 215          * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero,
 216          * see LINUX_MIB_TCPZEROWINDOWDROP
 217          */
 218         SKB_DROP_REASON_TCP_ZEROWINDOW,
 219         /**
 220          * @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data reveived is already
 221          * received before (spurious retrans may happened), see
 222          * LINUX_MIB_DELAYEDACKLOST
 223          */
 224         SKB_DROP_REASON_TCP_OLD_DATA,
 225         /**
 226          * @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window,
 227          * the seq of the first byte exceed the right edges of receive
 228          * window
 229          */
 230         SKB_DROP_REASON_TCP_OVERWINDOW,
 231         /**
 232          * @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo
 233          * queue, corresponding to LINUX_MIB_TCPOFOMERGE
 234          */
 235         SKB_DROP_REASON_TCP_OFOMERGE,
 236         /**
 237          * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to
 238          * LINUX_MIB_PAWSESTABREJECTED, LINUX_MIB_PAWSACTIVEREJECTED
 239          */
 240         SKB_DROP_REASON_TCP_RFC7323_PAWS,
 241         /** @SKB_DROP_REASON_TCP_OLD_SEQUENCE: Old SEQ field (duplicate packet) */
 242         SKB_DROP_REASON_TCP_OLD_SEQUENCE,
 243         /** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */
 244         SKB_DROP_REASON_TCP_INVALID_SEQUENCE,
 245         /**
 246          * @SKB_DROP_REASON_TCP_INVALID_ACK_SEQUENCE: Not acceptable ACK SEQ
 247          * field because ack sequence is not in the window between snd_una
 248          * and snd_nxt
 249          */
 250         SKB_DROP_REASON_TCP_INVALID_ACK_SEQUENCE,
 251         /** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */
 252         SKB_DROP_REASON_TCP_RESET,
 253         /**
 254          * @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected
 255          * SYN flag
 256          */
 257         SKB_DROP_REASON_TCP_INVALID_SYN,
 258         /** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */
 259         SKB_DROP_REASON_TCP_CLOSE,
 260         /** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */
 261         SKB_DROP_REASON_TCP_FASTOPEN,
 262         /** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */
 263         SKB_DROP_REASON_TCP_OLD_ACK,
 264         /** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */
 265         SKB_DROP_REASON_TCP_TOO_OLD_ACK,
 266         /**
 267          * @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't
 268          * sent yet
 269          */
 270         SKB_DROP_REASON_TCP_ACK_UNSENT_DATA,
 271         /** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */
 272         SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE,
 273         /** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */
 274         SKB_DROP_REASON_TCP_OFO_DROP,
 275         /** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */
 276         SKB_DROP_REASON_IP_OUTNOROUTES,
 277         /**
 278          * @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB
 279          * eBPF program
 280          */
 281         SKB_DROP_REASON_BPF_CGROUP_EGRESS,
 282         /** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */
 283         SKB_DROP_REASON_IPV6DISABLED,
 284         /** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */
 285         SKB_DROP_REASON_NEIGH_CREATEFAIL,
 286         /** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */
 287         SKB_DROP_REASON_NEIGH_FAILED,
 288         /** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */
 289         SKB_DROP_REASON_NEIGH_QUEUEFULL,
 290         /** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */
 291         SKB_DROP_REASON_NEIGH_DEAD,
 292         /** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */
 293         SKB_DROP_REASON_TC_EGRESS,
 294         /** @SKB_DROP_REASON_SECURITY_HOOK: dropped due to security HOOK */
 295         SKB_DROP_REASON_SECURITY_HOOK,
 296         /**
 297          * @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting (
 298          * failed to enqueue to current qdisc)
 299          */
 300         SKB_DROP_REASON_QDISC_DROP,
 301         /**
 302          * @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU
 303          * backlog queue. This can be caused by backlog queue full (see
 304          * netdev_max_backlog in net.rst) or RPS flow limit
 305          */
 306         SKB_DROP_REASON_CPU_BACKLOG,
 307         /** @SKB_DROP_REASON_XDP: dropped by XDP in input path */
 308         SKB_DROP_REASON_XDP,
 309         /** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */
 310         SKB_DROP_REASON_TC_INGRESS,
 311         /** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */
 312         SKB_DROP_REASON_UNHANDLED_PROTO,
 313         /** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */
 314         SKB_DROP_REASON_SKB_CSUM,
 315         /** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */
 316         SKB_DROP_REASON_SKB_GSO_SEG,
 317         /**
 318          * @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space,
 319          * e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx()
 320          */
 321         SKB_DROP_REASON_SKB_UCOPY_FAULT,
 322         /** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */
 323         SKB_DROP_REASON_DEV_HDR,
 324         /**
 325          * @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to
 326          * any of its data structure that is not up/ready/initialized,
 327          * e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq]
 328          * is not initialized
 329          */
 330         SKB_DROP_REASON_DEV_READY,
 331         /** @SKB_DROP_REASON_FULL_RING: ring buffer is full */
 332         SKB_DROP_REASON_FULL_RING,
 333         /** @SKB_DROP_REASON_NOMEM: error due to OOM */
 334         SKB_DROP_REASON_NOMEM,
 335         /**
 336          * @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from
 337          * networking data, e.g., failed to pull the protocol header from
 338          * frags via pskb_may_pull()
 339          */
 340         SKB_DROP_REASON_HDR_TRUNC,
 341         /**
 342          * @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached
 343          * to tun/tap, e.g., via TUNSETFILTEREBPF
 344          */
 345         SKB_DROP_REASON_TAP_FILTER,
 346         /**
 347          * @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at
 348          * tun/tap, e.g., check_filter()
 349          */
 350         SKB_DROP_REASON_TAP_TXFILTER,
 351         /** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */
 352         SKB_DROP_REASON_ICMP_CSUM,
 353         /**
 354          * @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211,
 355          * such as a broadcasts ICMP_TIMESTAMP
 356          */
 357         SKB_DROP_REASON_INVALID_PROTO,
 358         /**
 359          * @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to
 360          * IPSTATS_MIB_INADDRERRORS
 361          */
 362         SKB_DROP_REASON_IP_INADDRERRORS,
 363         /**
 364          * @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to
 365          * IPSTATS_MIB_INADDRERRORS
 366          */
 367         SKB_DROP_REASON_IP_INNOROUTES,
 368         /**
 369          * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the
 370          * MTU)
 371          */
 372         SKB_DROP_REASON_PKT_TOO_BIG,
 373         /** @SKB_DROP_REASON_DUP_FRAG: duplicate fragment */
 374         SKB_DROP_REASON_DUP_FRAG,
 375         /** @SKB_DROP_REASON_FRAG_REASM_TIMEOUT: fragment reassembly timeout */
 376         SKB_DROP_REASON_FRAG_REASM_TIMEOUT,
 377         /**
 378          * @SKB_DROP_REASON_FRAG_TOO_FAR: ipv4 fragment too far.
 379          * (/proc/sys/net/ipv4/ipfrag_max_dist)
 380          */
 381         SKB_DROP_REASON_FRAG_TOO_FAR,
 382         /**
 383          * @SKB_DROP_REASON_TCP_MINTTL: ipv4 ttl or ipv6 hoplimit below
 384          * the threshold (IP_MINTTL or IPV6_MINHOPCOUNT).
 385          */
 386         SKB_DROP_REASON_TCP_MINTTL,
 387         /** @SKB_DROP_REASON_IPV6_BAD_EXTHDR: Bad IPv6 extension header. */
 388         SKB_DROP_REASON_IPV6_BAD_EXTHDR,
 389         /** @SKB_DROP_REASON_IPV6_NDISC_FRAG: invalid frag (suppress_frag_ndisc). */
 390         SKB_DROP_REASON_IPV6_NDISC_FRAG,
 391         /** @SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT: invalid hop limit. */
 392         SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT,
 393         /** @SKB_DROP_REASON_IPV6_NDISC_BAD_CODE: invalid NDISC icmp6 code. */
 394         SKB_DROP_REASON_IPV6_NDISC_BAD_CODE,
 395         /** @SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS: invalid NDISC options. */
 396         SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS,
 397         /**
 398          * @SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST: NEIGHBOUR SOLICITATION
 399          * for another host.
 400          */
 401         SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST,
 402         /** @SKB_DROP_REASON_QUEUE_PURGE: bulk free. */
 403         SKB_DROP_REASON_QUEUE_PURGE,
 404         /**
 405          * @SKB_DROP_REASON_TC_COOKIE_ERROR: An error occurred whilst
 406          * processing a tc ext cookie.
 407          */
 408         SKB_DROP_REASON_TC_COOKIE_ERROR,
 409         /**
 410          * @SKB_DROP_REASON_PACKET_SOCK_ERROR: generic packet socket errors
 411          * after its filter matches an incoming packet.
 412          */
 413         SKB_DROP_REASON_PACKET_SOCK_ERROR,
 414         /** @SKB_DROP_REASON_TC_CHAIN_NOTFOUND: tc chain lookup failed. */
 415         SKB_DROP_REASON_TC_CHAIN_NOTFOUND,
 416         /**
 417          * @SKB_DROP_REASON_TC_RECLASSIFY_LOOP: tc exceeded max reclassify loop
 418          * iterations.
 419          */
 420         SKB_DROP_REASON_TC_RECLASSIFY_LOOP,
 421         /**
 422          * @SKB_DROP_REASON_MAX: the maximum of core drop reasons, which
 423          * shouldn't be used as a real 'reason' - only for tracing code gen
 424          */
 425         SKB_DROP_REASON_MAX,
 426
 427         /**
 428          * @SKB_DROP_REASON_SUBSYS_MASK: subsystem mask in drop reasons,
 429          * see &enum skb_drop_reason_subsys
 430          */
 431         SKB_DROP_REASON_SUBSYS_MASK = 0xffff0000,
 432 };
 433
 434 #define SKB_DROP_REASON_SUBSYS_SHIFT    16
 435
 436 #define SKB_DR_INIT(name, reason)                               \
 437         enum skb_drop_reason name = SKB_DROP_REASON_##reason
 438 #define SKB_DR(name)                                            \
 439         SKB_DR_INIT(name, NOT_SPECIFIED)
 440 #define SKB_DR_SET(name, reason)                                \
 441         (name = SKB_DROP_REASON_##reason)
 442 #define SKB_DR_OR(name, reason)                                 \
 443         do {                                                    \
 444                 if (name == SKB_DROP_REASON_NOT_SPECIFIED ||    \
 445                     name == SKB_NOT_DROPPED_YET)                \
 446                         SKB_DR_SET(name, reason);               \
 447         } while (0)
 448
 449 #endif