include/uapi/linux/bpf.h

   1 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
   2  *
   3  * This program is free software; you can redistribute it and/or
   4  * modify it under the terms of version 2 of the GNU General Public
   5  * License as published by the Free Software Foundation.
   6  */
   7 #ifndef _UAPI__LINUX_BPF_H__
   8 #define _UAPI__LINUX_BPF_H__
   9
  10 #include <linux/types.h>
  11 #include <linux/bpf_common.h>
  12
  13 /* Extended instruction set based on top of classic BPF */
  14
  15 /* instruction classes */
  16 #define BPF_ALU64       0x07    /* alu mode in double word width */
  17
  18 /* ld/ldx fields */
  19 #define BPF_DW          0x18    /* double word */
  20 #define BPF_XADD        0xc0    /* exclusive add */
  21
  22 /* alu/jmp fields */
  23 #define BPF_MOV         0xb0    /* mov reg to reg */
  24 #define BPF_ARSH        0xc0    /* sign extending arithmetic shift right */
  25
  26 /* change endianness of a register */
  27 #define BPF_END         0xd0    /* flags for endianness conversion: */
  28 #define BPF_TO_LE       0x00    /* convert to little-endian */
  29 #define BPF_TO_BE       0x08    /* convert to big-endian */
  30 #define BPF_FROM_LE     BPF_TO_LE
  31 #define BPF_FROM_BE     BPF_TO_BE
  32
  33 #define BPF_JNE         0x50    /* jump != */
  34 #define BPF_JSGT        0x60    /* SGT is signed '>', GT in x86 */
  35 #define BPF_JSGE        0x70    /* SGE is signed '>=', GE in x86 */
  36 #define BPF_CALL        0x80    /* function call */
  37 #define BPF_EXIT        0x90    /* function return */
  38
  39 /* Register numbers */
  40 enum {
  41         BPF_REG_0 = 0,
  42         BPF_REG_1,
  43         BPF_REG_2,
  44         BPF_REG_3,
  45         BPF_REG_4,
  46         BPF_REG_5,
  47         BPF_REG_6,
  48         BPF_REG_7,
  49         BPF_REG_8,
  50         BPF_REG_9,
  51         BPF_REG_10,
  52         __MAX_BPF_REG,
  53 };
  54
  55 /* BPF has 10 general purpose 64-bit registers and stack frame. */
  56 #define MAX_BPF_REG     __MAX_BPF_REG
  57
  58 struct bpf_insn {
  59         __u8    code;           /* opcode */
  60         __u8    dst_reg:4;      /* dest register */
  61         __u8    src_reg:4;      /* source register */
  62         __s16   off;            /* signed offset */
  63         __s32   imm;            /* signed immediate constant */
  64 };
  65
  66 /* BPF syscall commands, see bpf(2) man-page for details. */
  67 enum bpf_cmd {
  68         BPF_MAP_CREATE,
  69         BPF_MAP_LOOKUP_ELEM,
  70         BPF_MAP_UPDATE_ELEM,
  71         BPF_MAP_DELETE_ELEM,
  72         BPF_MAP_GET_NEXT_KEY,
  73         BPF_PROG_LOAD,
  74         BPF_OBJ_PIN,
  75         BPF_OBJ_GET,
  76         BPF_PROG_ATTACH,
  77         BPF_PROG_DETACH,
  78 };
  79
  80 enum bpf_map_type {
  81         BPF_MAP_TYPE_UNSPEC,
  82         BPF_MAP_TYPE_HASH,
  83         BPF_MAP_TYPE_ARRAY,
  84         BPF_MAP_TYPE_PROG_ARRAY,
  85         BPF_MAP_TYPE_PERF_EVENT_ARRAY,
  86         BPF_MAP_TYPE_PERCPU_HASH,
  87         BPF_MAP_TYPE_PERCPU_ARRAY,
  88         BPF_MAP_TYPE_STACK_TRACE,
  89         BPF_MAP_TYPE_CGROUP_ARRAY,
  90         BPF_MAP_TYPE_LRU_HASH,
  91         BPF_MAP_TYPE_LRU_PERCPU_HASH,
  92 };
  93
  94 enum bpf_prog_type {
  95         BPF_PROG_TYPE_UNSPEC,
  96         BPF_PROG_TYPE_SOCKET_FILTER,
  97         BPF_PROG_TYPE_KPROBE,
  98         BPF_PROG_TYPE_SCHED_CLS,
  99         BPF_PROG_TYPE_SCHED_ACT,
 100         BPF_PROG_TYPE_TRACEPOINT,
 101         BPF_PROG_TYPE_XDP,
 102         BPF_PROG_TYPE_PERF_EVENT,
 103         BPF_PROG_TYPE_CGROUP_SKB,
 104         BPF_PROG_TYPE_CGROUP_SOCK,
 105         BPF_PROG_TYPE_LWT_IN,
 106         BPF_PROG_TYPE_LWT_OUT,
 107         BPF_PROG_TYPE_LWT_XMIT,
 108 };
 109
 110 enum bpf_attach_type {
 111         BPF_CGROUP_INET_INGRESS,
 112         BPF_CGROUP_INET_EGRESS,
 113         BPF_CGROUP_INET_SOCK_CREATE,
 114         __MAX_BPF_ATTACH_TYPE
 115 };
 116
 117 #define MAX_BPF_ATTACH_TYPE __MAX_BPF_ATTACH_TYPE
 118
 119 #define BPF_PSEUDO_MAP_FD       1
 120
 121 /* flags for BPF_MAP_UPDATE_ELEM command */
 122 #define BPF_ANY         0 /* create new element or update existing */
 123 #define BPF_NOEXIST     1 /* create new element if it didn't exist */
 124 #define BPF_EXIST       2 /* update existing element */
 125
 126 #define BPF_F_NO_PREALLOC       (1U << 0)
 127 /* Instead of having one common LRU list in the
 128  * BPF_MAP_TYPE_LRU_[PERCPU_]HASH map, use a percpu LRU list
 129  * which can scale and perform better.
 130  * Note, the LRU nodes (including free nodes) cannot be moved
 131  * across different LRU lists.
 132  */
 133 #define BPF_F_NO_COMMON_LRU     (1U << 1)
 134
 135 union bpf_attr {
 136         struct { /* anonymous struct used by BPF_MAP_CREATE command */
 137                 __u32   map_type;       /* one of enum bpf_map_type */
 138                 __u32   key_size;       /* size of key in bytes */
 139                 __u32   value_size;     /* size of value in bytes */
 140                 __u32   max_entries;    /* max number of entries in a map */
 141                 __u32   map_flags;      /* prealloc or not */
 142         };
 143
 144         struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */
 145                 __u32           map_fd;
 146                 __aligned_u64   key;
 147                 union {
 148                         __aligned_u64 value;
 149                         __aligned_u64 next_key;
 150                 };
 151                 __u64           flags;
 152         };
 153
 154         struct { /* anonymous struct used by BPF_PROG_LOAD command */
 155                 __u32           prog_type;      /* one of enum bpf_prog_type */
 156                 __u32           insn_cnt;
 157                 __aligned_u64   insns;
 158                 __aligned_u64   license;
 159                 __u32           log_level;      /* verbosity level of verifier */
 160                 __u32           log_size;       /* size of user buffer */
 161                 __aligned_u64   log_buf;        /* user supplied buffer */
 162                 __u32           kern_version;   /* checked when prog_type=kprobe */
 163         };
 164
 165         struct { /* anonymous struct used by BPF_OBJ_* commands */
 166                 __aligned_u64   pathname;
 167                 __u32           bpf_fd;
 168         };
 169
 170         struct { /* anonymous struct used by BPF_PROG_ATTACH/DETACH commands */
 171                 __u32           target_fd;      /* container object to attach to */
 172                 __u32           attach_bpf_fd;  /* eBPF program to attach */
 173                 __u32           attach_type;
 174         };
 175 } __attribute__((aligned(8)));
 176
 177 /* BPF helper function descriptions:
 178  *
 179  * void *bpf_map_lookup_elem(&map, &key)
 180  *     Return: Map value or NULL
 181  *
 182  * int bpf_map_update_elem(&map, &key, &value, flags)
 183  *     Return: 0 on success or negative error
 184  *
 185  * int bpf_map_delete_elem(&map, &key)
 186  *     Return: 0 on success or negative error
 187  *
 188  * int bpf_probe_read(void *dst, int size, void *src)
 189  *     Return: 0 on success or negative error
 190  *
 191  * u64 bpf_ktime_get_ns(void)
 192  *     Return: current ktime
 193  *
 194  * int bpf_trace_printk(const char *fmt, int fmt_size, ...)
 195  *     Return: length of buffer written or negative error
 196  *
 197  * u32 bpf_prandom_u32(void)
 198  *     Return: random value
 199  *
 200  * u32 bpf_raw_smp_processor_id(void)
 201  *     Return: SMP processor ID
 202  *
 203  * int bpf_skb_store_bytes(skb, offset, from, len, flags)
 204  *     store bytes into packet
 205  *     @skb: pointer to skb
 206  *     @offset: offset within packet from skb->mac_header
 207  *     @from: pointer where to copy bytes from
 208  *     @len: number of bytes to store into packet
 209  *     @flags: bit 0 - if true, recompute skb->csum
 210  *             other bits - reserved
 211  *     Return: 0 on success or negative error
 212  *
 213  * int bpf_l3_csum_replace(skb, offset, from, to, flags)
 214  *     recompute IP checksum
 215  *     @skb: pointer to skb
 216  *     @offset: offset within packet where IP checksum is located
 217  *     @from: old value of header field
 218  *     @to: new value of header field
 219  *     @flags: bits 0-3 - size of header field
 220  *             other bits - reserved
 221  *     Return: 0 on success or negative error
 222  *
 223  * int bpf_l4_csum_replace(skb, offset, from, to, flags)
 224  *     recompute TCP/UDP checksum
 225  *     @skb: pointer to skb
 226  *     @offset: offset within packet where TCP/UDP checksum is located
 227  *     @from: old value of header field
 228  *     @to: new value of header field
 229  *     @flags: bits 0-3 - size of header field
 230  *             bit 4 - is pseudo header
 231  *             other bits - reserved
 232  *     Return: 0 on success or negative error
 233  *
 234  * int bpf_tail_call(ctx, prog_array_map, index)
 235  *     jump into another BPF program
 236  *     @ctx: context pointer passed to next program
 237  *     @prog_array_map: pointer to map which type is BPF_MAP_TYPE_PROG_ARRAY
 238  *     @index: index inside array that selects specific program to run
 239  *     Return: 0 on success or negative error
 240  *
 241  * int bpf_clone_redirect(skb, ifindex, flags)
 242  *     redirect to another netdev
 243  *     @skb: pointer to skb
 244  *     @ifindex: ifindex of the net device
 245  *     @flags: bit 0 - if set, redirect to ingress instead of egress
 246  *             other bits - reserved
 247  *     Return: 0 on success or negative error
 248  *
 249  * u64 bpf_get_current_pid_tgid(void)
 250  *     Return: current->tgid << 32 | current->pid
 251  *
 252  * u64 bpf_get_current_uid_gid(void)
 253  *     Return: current_gid << 32 | current_uid
 254  *
 255  * int bpf_get_current_comm(char *buf, int size_of_buf)
 256  *     stores current->comm into buf
 257  *     Return: 0 on success or negative error
 258  *
 259  * u32 bpf_get_cgroup_classid(skb)
 260  *     retrieve a proc's classid
 261  *     @skb: pointer to skb
 262  *     Return: classid if != 0
 263  *
 264  * int bpf_skb_vlan_push(skb, vlan_proto, vlan_tci)
 265  *     Return: 0 on success or negative error
 266  *
 267  * int bpf_skb_vlan_pop(skb)
 268  *     Return: 0 on success or negative error
 269  *
 270  * int bpf_skb_get_tunnel_key(skb, key, size, flags)
 271  * int bpf_skb_set_tunnel_key(skb, key, size, flags)
 272  *     retrieve or populate tunnel metadata
 273  *     @skb: pointer to skb
 274  *     @key: pointer to 'struct bpf_tunnel_key'
 275  *     @size: size of 'struct bpf_tunnel_key'
 276  *     @flags: room for future extensions
 277  *     Return: 0 on success or negative error
 278  *
 279  * u64 bpf_perf_event_read(&map, index)
 280  *     Return: Number events read or error code
 281  *
 282  * int bpf_redirect(ifindex, flags)
 283  *     redirect to another netdev
 284  *     @ifindex: ifindex of the net device
 285  *     @flags: bit 0 - if set, redirect to ingress instead of egress
 286  *             other bits - reserved
 287  *     Return: TC_ACT_REDIRECT
 288  *
 289  * u32 bpf_get_route_realm(skb)
 290  *     retrieve a dst's tclassid
 291  *     @skb: pointer to skb
 292  *     Return: realm if != 0
 293  *
 294  * int bpf_perf_event_output(ctx, map, index, data, size)
 295  *     output perf raw sample
 296  *     @ctx: struct pt_regs*
 297  *     @map: pointer to perf_event_array map
 298  *     @index: index of event in the map
 299  *     @data: data on stack to be output as raw data
 300  *     @size: size of data
 301  *     Return: 0 on success or negative error
 302  *
 303  * int bpf_get_stackid(ctx, map, flags)
 304  *     walk user or kernel stack and return id
 305  *     @ctx: struct pt_regs*
 306  *     @map: pointer to stack_trace map
 307  *     @flags: bits 0-7 - numer of stack frames to skip
 308  *             bit 8 - collect user stack instead of kernel
 309  *             bit 9 - compare stacks by hash only
 310  *             bit 10 - if two different stacks hash into the same stackid
 311  *                      discard old
 312  *             other bits - reserved
 313  *     Return: >= 0 stackid on success or negative error
 314  *
 315  * s64 bpf_csum_diff(from, from_size, to, to_size, seed)
 316  *     calculate csum diff
 317  *     @from: raw from buffer
 318  *     @from_size: length of from buffer
 319  *     @to: raw to buffer
 320  *     @to_size: length of to buffer
 321  *     @seed: optional seed
 322  *     Return: csum result or negative error code
 323  *
 324  * int bpf_skb_get_tunnel_opt(skb, opt, size)
 325  *     retrieve tunnel options metadata
 326  *     @skb: pointer to skb
 327  *     @opt: pointer to raw tunnel option data
 328  *     @size: size of @opt
 329  *     Return: option size
 330  *
 331  * int bpf_skb_set_tunnel_opt(skb, opt, size)
 332  *     populate tunnel options metadata
 333  *     @skb: pointer to skb
 334  *     @opt: pointer to raw tunnel option data
 335  *     @size: size of @opt
 336  *     Return: 0 on success or negative error
 337  *
 338  * int bpf_skb_change_proto(skb, proto, flags)
 339  *     Change protocol of the skb. Currently supported is v4 -> v6,
 340  *     v6 -> v4 transitions. The helper will also resize the skb. eBPF
 341  *     program is expected to fill the new headers via skb_store_bytes
 342  *     and lX_csum_replace.
 343  *     @skb: pointer to skb
 344  *     @proto: new skb->protocol type
 345  *     @flags: reserved
 346  *     Return: 0 on success or negative error
 347  *
 348  * int bpf_skb_change_type(skb, type)
 349  *     Change packet type of skb.
 350  *     @skb: pointer to skb
 351  *     @type: new skb->pkt_type type
 352  *     Return: 0 on success or negative error
 353  *
 354  * int bpf_skb_under_cgroup(skb, map, index)
 355  *     Check cgroup2 membership of skb
 356  *     @skb: pointer to skb
 357  *     @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type
 358  *     @index: index of the cgroup in the bpf_map
 359  *     Return:
 360  *       == 0 skb failed the cgroup2 descendant test
 361  *       == 1 skb succeeded the cgroup2 descendant test
 362  *        < 0 error
 363  *
 364  * u32 bpf_get_hash_recalc(skb)
 365  *     Retrieve and possibly recalculate skb->hash.
 366  *     @skb: pointer to skb
 367  *     Return: hash
 368  *
 369  * u64 bpf_get_current_task(void)
 370  *     Returns current task_struct
 371  *     Return: current
 372  *
 373  * int bpf_probe_write_user(void *dst, void *src, int len)
 374  *     safely attempt to write to a location
 375  *     @dst: destination address in userspace
 376  *     @src: source address on stack
 377  *     @len: number of bytes to copy
 378  *     Return: 0 on success or negative error
 379  *
 380  * int bpf_current_task_under_cgroup(map, index)
 381  *     Check cgroup2 membership of current task
 382  *     @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type
 383  *     @index: index of the cgroup in the bpf_map
 384  *     Return:
 385  *       == 0 current failed the cgroup2 descendant test
 386  *       == 1 current succeeded the cgroup2 descendant test
 387  *        < 0 error
 388  *
 389  * int bpf_skb_change_tail(skb, len, flags)
 390  *     The helper will resize the skb to the given new size, to be used f.e.
 391  *     with control messages.
 392  *     @skb: pointer to skb
 393  *     @len: new skb length
 394  *     @flags: reserved
 395  *     Return: 0 on success or negative error
 396  *
 397  * int bpf_skb_pull_data(skb, len)
 398  *     The helper will pull in non-linear data in case the skb is non-linear
 399  *     and not all of len are part of the linear section. Only needed for
 400  *     read/write with direct packet access.
 401  *     @skb: pointer to skb
 402  *     @len: len to make read/writeable
 403  *     Return: 0 on success or negative error
 404  *
 405  * s64 bpf_csum_update(skb, csum)
 406  *     Adds csum into skb->csum in case of CHECKSUM_COMPLETE.
 407  *     @skb: pointer to skb
 408  *     @csum: csum to add
 409  *     Return: csum on success or negative error
 410  *
 411  * void bpf_set_hash_invalid(skb)
 412  *     Invalidate current skb->hash.
 413  *     @skb: pointer to skb
 414  *
 415  * int bpf_get_numa_node_id()
 416  *     Return: Id of current NUMA node.
 417  *
 418  * int bpf_skb_change_head()
 419  *     Grows headroom of skb and adjusts MAC header offset accordingly.
 420  *     Will extends/reallocae as required automatically.
 421  *     May change skb data pointer and will thus invalidate any check
 422  *     performed for direct packet access.
 423  *     @skb: pointer to skb
 424  *     @len: length of header to be pushed in front
 425  *     @flags: Flags (unused for now)
 426  *     Return: 0 on success or negative error
 427  */
 428 #define __BPF_FUNC_MAPPER(FN)           \
 429         FN(unspec),                     \
 430         FN(map_lookup_elem),            \
 431         FN(map_update_elem),            \
 432         FN(map_delete_elem),            \
 433         FN(probe_read),                 \
 434         FN(ktime_get_ns),               \
 435         FN(trace_printk),               \
 436         FN(get_prandom_u32),            \
 437         FN(get_smp_processor_id),       \
 438         FN(skb_store_bytes),            \
 439         FN(l3_csum_replace),            \
 440         FN(l4_csum_replace),            \
 441         FN(tail_call),                  \
 442         FN(clone_redirect),             \
 443         FN(get_current_pid_tgid),       \
 444         FN(get_current_uid_gid),        \
 445         FN(get_current_comm),           \
 446         FN(get_cgroup_classid),         \
 447         FN(skb_vlan_push),              \
 448         FN(skb_vlan_pop),               \
 449         FN(skb_get_tunnel_key),         \
 450         FN(skb_set_tunnel_key),         \
 451         FN(perf_event_read),            \
 452         FN(redirect),                   \
 453         FN(get_route_realm),            \
 454         FN(perf_event_output),          \
 455         FN(skb_load_bytes),             \
 456         FN(get_stackid),                \
 457         FN(csum_diff),                  \
 458         FN(skb_get_tunnel_opt),         \
 459         FN(skb_set_tunnel_opt),         \
 460         FN(skb_change_proto),           \
 461         FN(skb_change_type),            \
 462         FN(skb_under_cgroup),           \
 463         FN(get_hash_recalc),            \
 464         FN(get_current_task),           \
 465         FN(probe_write_user),           \
 466         FN(current_task_under_cgroup),  \
 467         FN(skb_change_tail),            \
 468         FN(skb_pull_data),              \
 469         FN(csum_update),                \
 470         FN(set_hash_invalid),           \
 471         FN(get_numa_node_id),           \
 472         FN(skb_change_head),
 473
 474 /* integer value in 'imm' field of BPF_CALL instruction selects which helper
 475  * function eBPF program intends to call
 476  */
 477 #define __BPF_ENUM_FN(x) BPF_FUNC_ ## x
 478 enum bpf_func_id {
 479         __BPF_FUNC_MAPPER(__BPF_ENUM_FN)
 480         __BPF_FUNC_MAX_ID,
 481 };
 482 #undef __BPF_ENUM_FN
 483
 484 /* All flags used by eBPF helper functions, placed here. */
 485
 486 /* BPF_FUNC_skb_store_bytes flags. */
 487 #define BPF_F_RECOMPUTE_CSUM            (1ULL << 0)
 488 #define BPF_F_INVALIDATE_HASH           (1ULL << 1)
 489
 490 /* BPF_FUNC_l3_csum_replace and BPF_FUNC_l4_csum_replace flags.
 491  * First 4 bits are for passing the header field size.
 492  */
 493 #define BPF_F_HDR_FIELD_MASK            0xfULL
 494
 495 /* BPF_FUNC_l4_csum_replace flags. */
 496 #define BPF_F_PSEUDO_HDR                (1ULL << 4)
 497 #define BPF_F_MARK_MANGLED_0            (1ULL << 5)
 498
 499 /* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */
 500 #define BPF_F_INGRESS                   (1ULL << 0)
 501
 502 /* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */
 503 #define BPF_F_TUNINFO_IPV6              (1ULL << 0)
 504
 505 /* BPF_FUNC_get_stackid flags. */
 506 #define BPF_F_SKIP_FIELD_MASK           0xffULL
 507 #define BPF_F_USER_STACK                (1ULL << 8)
 508 #define BPF_F_FAST_STACK_CMP            (1ULL << 9)
 509 #define BPF_F_REUSE_STACKID             (1ULL << 10)
 510
 511 /* BPF_FUNC_skb_set_tunnel_key flags. */
 512 #define BPF_F_ZERO_CSUM_TX              (1ULL << 1)
 513 #define BPF_F_DONT_FRAGMENT             (1ULL << 2)
 514
 515 /* BPF_FUNC_perf_event_output and BPF_FUNC_perf_event_read flags. */
 516 #define BPF_F_INDEX_MASK                0xffffffffULL
 517 #define BPF_F_CURRENT_CPU               BPF_F_INDEX_MASK
 518 /* BPF_FUNC_perf_event_output for sk_buff input context. */
 519 #define BPF_F_CTXLEN_MASK               (0xfffffULL << 32)
 520
 521 /* user accessible mirror of in-kernel sk_buff.
 522  * new fields can only be added to the end of this structure
 523  */
 524 struct __sk_buff {
 525         __u32 len;
 526         __u32 pkt_type;
 527         __u32 mark;
 528         __u32 queue_mapping;
 529         __u32 protocol;
 530         __u32 vlan_present;
 531         __u32 vlan_tci;
 532         __u32 vlan_proto;
 533         __u32 priority;
 534         __u32 ingress_ifindex;
 535         __u32 ifindex;
 536         __u32 tc_index;
 537         __u32 cb[5];
 538         __u32 hash;
 539         __u32 tc_classid;
 540         __u32 data;
 541         __u32 data_end;
 542 };
 543
 544 struct bpf_tunnel_key {
 545         __u32 tunnel_id;
 546         union {
 547                 __u32 remote_ipv4;
 548                 __u32 remote_ipv6[4];
 549         };
 550         __u8 tunnel_tos;
 551         __u8 tunnel_ttl;
 552         __u16 tunnel_ext;
 553         __u32 tunnel_label;
 554 };
 555
 556 /* Generic BPF return codes which all BPF program types may support.
 557  * The values are binary compatible with their TC_ACT_* counter-part to
 558  * provide backwards compatibility with existing SCHED_CLS and SCHED_ACT
 559  * programs.
 560  *
 561  * XDP is handled seprately, see XDP_*.
 562  */
 563 enum bpf_ret_code {
 564         BPF_OK = 0,
 565         /* 1 reserved */
 566         BPF_DROP = 2,
 567         /* 3-6 reserved */
 568         BPF_REDIRECT = 7,
 569         /* >127 are reserved for prog type specific return codes */
 570 };
 571
 572 struct bpf_sock {
 573         __u32 bound_dev_if;
 574 };
 575
 576 /* User return codes for XDP prog type.
 577  * A valid XDP program must return one of these defined values. All other
 578  * return codes are reserved for future use. Unknown return codes will result
 579  * in packet drop.
 580  */
 581 enum xdp_action {
 582         XDP_ABORTED = 0,
 583         XDP_DROP,
 584         XDP_PASS,
 585         XDP_TX,
 586 };
 587
 588 /* user accessible metadata for XDP packet hook
 589  * new fields must be added to the end of this structure
 590  */
 591 struct xdp_md {
 592         __u32 data;
 593         __u32 data_end;
 594 };
 595
 596 #endif /* _UAPI__LINUX_BPF_H__ */