tools/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 /* Key of an a BPF_MAP_TYPE_LPM_TRIE entry */
  67 struct bpf_lpm_trie_key {
  68         __u32   prefixlen;      /* up to 32 for AF_INET, 128 for AF_INET6 */
  69         __u8    data[0];        /* Arbitrary size */
  70 };
  71
  72 /* BPF syscall commands, see bpf(2) man-page for details. */
  73 enum bpf_cmd {
  74         BPF_MAP_CREATE,
  75         BPF_MAP_LOOKUP_ELEM,
  76         BPF_MAP_UPDATE_ELEM,
  77         BPF_MAP_DELETE_ELEM,
  78         BPF_MAP_GET_NEXT_KEY,
  79         BPF_PROG_LOAD,
  80         BPF_OBJ_PIN,
  81         BPF_OBJ_GET,
  82         BPF_PROG_ATTACH,
  83         BPF_PROG_DETACH,
  84 };
  85
  86 enum bpf_map_type {
  87         BPF_MAP_TYPE_UNSPEC,
  88         BPF_MAP_TYPE_HASH,
  89         BPF_MAP_TYPE_ARRAY,
  90         BPF_MAP_TYPE_PROG_ARRAY,
  91         BPF_MAP_TYPE_PERF_EVENT_ARRAY,
  92         BPF_MAP_TYPE_PERCPU_HASH,
  93         BPF_MAP_TYPE_PERCPU_ARRAY,
  94         BPF_MAP_TYPE_STACK_TRACE,
  95         BPF_MAP_TYPE_CGROUP_ARRAY,
  96         BPF_MAP_TYPE_LRU_HASH,
  97         BPF_MAP_TYPE_LRU_PERCPU_HASH,
  98         BPF_MAP_TYPE_LPM_TRIE,
  99         BPF_MAP_TYPE_ARRAY_OF_MAPS,
 100         BPF_MAP_TYPE_HASH_OF_MAPS,
 101 };
 102
 103 enum bpf_prog_type {
 104         BPF_PROG_TYPE_UNSPEC,
 105         BPF_PROG_TYPE_SOCKET_FILTER,
 106         BPF_PROG_TYPE_KPROBE,
 107         BPF_PROG_TYPE_SCHED_CLS,
 108         BPF_PROG_TYPE_SCHED_ACT,
 109         BPF_PROG_TYPE_TRACEPOINT,
 110         BPF_PROG_TYPE_XDP,
 111         BPF_PROG_TYPE_PERF_EVENT,
 112         BPF_PROG_TYPE_CGROUP_SKB,
 113         BPF_PROG_TYPE_CGROUP_SOCK,
 114         BPF_PROG_TYPE_LWT_IN,
 115         BPF_PROG_TYPE_LWT_OUT,
 116         BPF_PROG_TYPE_LWT_XMIT,
 117 };
 118
 119 enum bpf_attach_type {
 120         BPF_CGROUP_INET_INGRESS,
 121         BPF_CGROUP_INET_EGRESS,
 122         BPF_CGROUP_INET_SOCK_CREATE,
 123         __MAX_BPF_ATTACH_TYPE
 124 };
 125
 126 #define MAX_BPF_ATTACH_TYPE __MAX_BPF_ATTACH_TYPE
 127
 128 /* If BPF_F_ALLOW_OVERRIDE flag is used in BPF_PROG_ATTACH command
 129  * to the given target_fd cgroup the descendent cgroup will be able to
 130  * override effective bpf program that was inherited from this cgroup
 131  */
 132 #define BPF_F_ALLOW_OVERRIDE    (1U << 0)
 133
 134 #define BPF_PSEUDO_MAP_FD       1
 135
 136 /* flags for BPF_MAP_UPDATE_ELEM command */
 137 #define BPF_ANY         0 /* create new element or update existing */
 138 #define BPF_NOEXIST     1 /* create new element if it didn't exist */
 139 #define BPF_EXIST       2 /* update existing element */
 140
 141 #define BPF_F_NO_PREALLOC       (1U << 0)
 142 /* Instead of having one common LRU list in the
 143  * BPF_MAP_TYPE_LRU_[PERCPU_]HASH map, use a percpu LRU list
 144  * which can scale and perform better.
 145  * Note, the LRU nodes (including free nodes) cannot be moved
 146  * across different LRU lists.
 147  */
 148 #define BPF_F_NO_COMMON_LRU     (1U << 1)
 149
 150 union bpf_attr {
 151         struct { /* anonymous struct used by BPF_MAP_CREATE command */
 152                 __u32   map_type;       /* one of enum bpf_map_type */
 153                 __u32   key_size;       /* size of key in bytes */
 154                 __u32   value_size;     /* size of value in bytes */
 155                 __u32   max_entries;    /* max number of entries in a map */
 156                 __u32   map_flags;      /* prealloc or not */
 157                 __u32   inner_map_fd;   /* fd pointing to the inner map */
 158         };
 159
 160         struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */
 161                 __u32           map_fd;
 162                 __aligned_u64   key;
 163                 union {
 164                         __aligned_u64 value;
 165                         __aligned_u64 next_key;
 166                 };
 167                 __u64           flags;
 168         };
 169
 170         struct { /* anonymous struct used by BPF_PROG_LOAD command */
 171                 __u32           prog_type;      /* one of enum bpf_prog_type */
 172                 __u32           insn_cnt;
 173                 __aligned_u64   insns;
 174                 __aligned_u64   license;
 175                 __u32           log_level;      /* verbosity level of verifier */
 176                 __u32           log_size;       /* size of user buffer */
 177                 __aligned_u64   log_buf;        /* user supplied buffer */
 178                 __u32           kern_version;   /* checked when prog_type=kprobe */
 179         };
 180
 181         struct { /* anonymous struct used by BPF_OBJ_* commands */
 182                 __aligned_u64   pathname;
 183                 __u32           bpf_fd;
 184         };
 185
 186         struct { /* anonymous struct used by BPF_PROG_ATTACH/DETACH commands */
 187                 __u32           target_fd;      /* container object to attach to */
 188                 __u32           attach_bpf_fd;  /* eBPF program to attach */
 189                 __u32           attach_type;
 190                 __u32           attach_flags;
 191         };
 192 } __attribute__((aligned(8)));
 193
 194 /* BPF helper function descriptions:
 195  *
 196  * void *bpf_map_lookup_elem(&map, &key)
 197  *     Return: Map value or NULL
 198  *
 199  * int bpf_map_update_elem(&map, &key, &value, flags)
 200  *     Return: 0 on success or negative error
 201  *
 202  * int bpf_map_delete_elem(&map, &key)
 203  *     Return: 0 on success or negative error
 204  *
 205  * int bpf_probe_read(void *dst, int size, void *src)
 206  *     Return: 0 on success or negative error
 207  *
 208  * u64 bpf_ktime_get_ns(void)
 209  *     Return: current ktime
 210  *
 211  * int bpf_trace_printk(const char *fmt, int fmt_size, ...)
 212  *     Return: length of buffer written or negative error
 213  *
 214  * u32 bpf_prandom_u32(void)
 215  *     Return: random value
 216  *
 217  * u32 bpf_raw_smp_processor_id(void)
 218  *     Return: SMP processor ID
 219  *
 220  * int bpf_skb_store_bytes(skb, offset, from, len, flags)
 221  *     store bytes into packet
 222  *     @skb: pointer to skb
 223  *     @offset: offset within packet from skb->mac_header
 224  *     @from: pointer where to copy bytes from
 225  *     @len: number of bytes to store into packet
 226  *     @flags: bit 0 - if true, recompute skb->csum
 227  *             other bits - reserved
 228  *     Return: 0 on success or negative error
 229  *
 230  * int bpf_l3_csum_replace(skb, offset, from, to, flags)
 231  *     recompute IP checksum
 232  *     @skb: pointer to skb
 233  *     @offset: offset within packet where IP checksum is located
 234  *     @from: old value of header field
 235  *     @to: new value of header field
 236  *     @flags: bits 0-3 - size of header field
 237  *             other bits - reserved
 238  *     Return: 0 on success or negative error
 239  *
 240  * int bpf_l4_csum_replace(skb, offset, from, to, flags)
 241  *     recompute TCP/UDP checksum
 242  *     @skb: pointer to skb
 243  *     @offset: offset within packet where TCP/UDP checksum is located
 244  *     @from: old value of header field
 245  *     @to: new value of header field
 246  *     @flags: bits 0-3 - size of header field
 247  *             bit 4 - is pseudo header
 248  *             other bits - reserved
 249  *     Return: 0 on success or negative error
 250  *
 251  * int bpf_tail_call(ctx, prog_array_map, index)
 252  *     jump into another BPF program
 253  *     @ctx: context pointer passed to next program
 254  *     @prog_array_map: pointer to map which type is BPF_MAP_TYPE_PROG_ARRAY
 255  *     @index: index inside array that selects specific program to run
 256  *     Return: 0 on success or negative error
 257  *
 258  * int bpf_clone_redirect(skb, ifindex, flags)
 259  *     redirect to another netdev
 260  *     @skb: pointer to skb
 261  *     @ifindex: ifindex of the net device
 262  *     @flags: bit 0 - if set, redirect to ingress instead of egress
 263  *             other bits - reserved
 264  *     Return: 0 on success or negative error
 265  *
 266  * u64 bpf_get_current_pid_tgid(void)
 267  *     Return: current->tgid << 32 | current->pid
 268  *
 269  * u64 bpf_get_current_uid_gid(void)
 270  *     Return: current_gid << 32 | current_uid
 271  *
 272  * int bpf_get_current_comm(char *buf, int size_of_buf)
 273  *     stores current->comm into buf
 274  *     Return: 0 on success or negative error
 275  *
 276  * u32 bpf_get_cgroup_classid(skb)
 277  *     retrieve a proc's classid
 278  *     @skb: pointer to skb
 279  *     Return: classid if != 0
 280  *
 281  * int bpf_skb_vlan_push(skb, vlan_proto, vlan_tci)
 282  *     Return: 0 on success or negative error
 283  *
 284  * int bpf_skb_vlan_pop(skb)
 285  *     Return: 0 on success or negative error
 286  *
 287  * int bpf_skb_get_tunnel_key(skb, key, size, flags)
 288  * int bpf_skb_set_tunnel_key(skb, key, size, flags)
 289  *     retrieve or populate tunnel metadata
 290  *     @skb: pointer to skb
 291  *     @key: pointer to 'struct bpf_tunnel_key'
 292  *     @size: size of 'struct bpf_tunnel_key'
 293  *     @flags: room for future extensions
 294  *     Return: 0 on success or negative error
 295  *
 296  * u64 bpf_perf_event_read(&map, index)
 297  *     Return: Number events read or error code
 298  *
 299  * int bpf_redirect(ifindex, flags)
 300  *     redirect to another netdev
 301  *     @ifindex: ifindex of the net device
 302  *     @flags: bit 0 - if set, redirect to ingress instead of egress
 303  *             other bits - reserved
 304  *     Return: TC_ACT_REDIRECT
 305  *
 306  * u32 bpf_get_route_realm(skb)
 307  *     retrieve a dst's tclassid
 308  *     @skb: pointer to skb
 309  *     Return: realm if != 0
 310  *
 311  * int bpf_perf_event_output(ctx, map, index, data, size)
 312  *     output perf raw sample
 313  *     @ctx: struct pt_regs*
 314  *     @map: pointer to perf_event_array map
 315  *     @index: index of event in the map
 316  *     @data: data on stack to be output as raw data
 317  *     @size: size of data
 318  *     Return: 0 on success or negative error
 319  *
 320  * int bpf_get_stackid(ctx, map, flags)
 321  *     walk user or kernel stack and return id
 322  *     @ctx: struct pt_regs*
 323  *     @map: pointer to stack_trace map
 324  *     @flags: bits 0-7 - numer of stack frames to skip
 325  *             bit 8 - collect user stack instead of kernel
 326  *             bit 9 - compare stacks by hash only
 327  *             bit 10 - if two different stacks hash into the same stackid
 328  *                      discard old
 329  *             other bits - reserved
 330  *     Return: >= 0 stackid on success or negative error
 331  *
 332  * s64 bpf_csum_diff(from, from_size, to, to_size, seed)
 333  *     calculate csum diff
 334  *     @from: raw from buffer
 335  *     @from_size: length of from buffer
 336  *     @to: raw to buffer
 337  *     @to_size: length of to buffer
 338  *     @seed: optional seed
 339  *     Return: csum result or negative error code
 340  *
 341  * int bpf_skb_get_tunnel_opt(skb, opt, size)
 342  *     retrieve tunnel options metadata
 343  *     @skb: pointer to skb
 344  *     @opt: pointer to raw tunnel option data
 345  *     @size: size of @opt
 346  *     Return: option size
 347  *
 348  * int bpf_skb_set_tunnel_opt(skb, opt, size)
 349  *     populate tunnel options metadata
 350  *     @skb: pointer to skb
 351  *     @opt: pointer to raw tunnel option data
 352  *     @size: size of @opt
 353  *     Return: 0 on success or negative error
 354  *
 355  * int bpf_skb_change_proto(skb, proto, flags)
 356  *     Change protocol of the skb. Currently supported is v4 -> v6,
 357  *     v6 -> v4 transitions. The helper will also resize the skb. eBPF
 358  *     program is expected to fill the new headers via skb_store_bytes
 359  *     and lX_csum_replace.
 360  *     @skb: pointer to skb
 361  *     @proto: new skb->protocol type
 362  *     @flags: reserved
 363  *     Return: 0 on success or negative error
 364  *
 365  * int bpf_skb_change_type(skb, type)
 366  *     Change packet type of skb.
 367  *     @skb: pointer to skb
 368  *     @type: new skb->pkt_type type
 369  *     Return: 0 on success or negative error
 370  *
 371  * int bpf_skb_under_cgroup(skb, map, index)
 372  *     Check cgroup2 membership of skb
 373  *     @skb: pointer to skb
 374  *     @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type
 375  *     @index: index of the cgroup in the bpf_map
 376  *     Return:
 377  *       == 0 skb failed the cgroup2 descendant test
 378  *       == 1 skb succeeded the cgroup2 descendant test
 379  *        < 0 error
 380  *
 381  * u32 bpf_get_hash_recalc(skb)
 382  *     Retrieve and possibly recalculate skb->hash.
 383  *     @skb: pointer to skb
 384  *     Return: hash
 385  *
 386  * u64 bpf_get_current_task(void)
 387  *     Returns current task_struct
 388  *     Return: current
 389  *
 390  * int bpf_probe_write_user(void *dst, void *src, int len)
 391  *     safely attempt to write to a location
 392  *     @dst: destination address in userspace
 393  *     @src: source address on stack
 394  *     @len: number of bytes to copy
 395  *     Return: 0 on success or negative error
 396  *
 397  * int bpf_current_task_under_cgroup(map, index)
 398  *     Check cgroup2 membership of current task
 399  *     @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type
 400  *     @index: index of the cgroup in the bpf_map
 401  *     Return:
 402  *       == 0 current failed the cgroup2 descendant test
 403  *       == 1 current succeeded the cgroup2 descendant test
 404  *        < 0 error
 405  *
 406  * int bpf_skb_change_tail(skb, len, flags)
 407  *     The helper will resize the skb to the given new size, to be used f.e.
 408  *     with control messages.
 409  *     @skb: pointer to skb
 410  *     @len: new skb length
 411  *     @flags: reserved
 412  *     Return: 0 on success or negative error
 413  *
 414  * int bpf_skb_pull_data(skb, len)
 415  *     The helper will pull in non-linear data in case the skb is non-linear
 416  *     and not all of len are part of the linear section. Only needed for
 417  *     read/write with direct packet access.
 418  *     @skb: pointer to skb
 419  *     @len: len to make read/writeable
 420  *     Return: 0 on success or negative error
 421  *
 422  * s64 bpf_csum_update(skb, csum)
 423  *     Adds csum into skb->csum in case of CHECKSUM_COMPLETE.
 424  *     @skb: pointer to skb
 425  *     @csum: csum to add
 426  *     Return: csum on success or negative error
 427  *
 428  * void bpf_set_hash_invalid(skb)
 429  *     Invalidate current skb->hash.
 430  *     @skb: pointer to skb
 431  *
 432  * int bpf_get_numa_node_id()
 433  *     Return: Id of current NUMA node.
 434  *
 435  * int bpf_skb_change_head()
 436  *     Grows headroom of skb and adjusts MAC header offset accordingly.
 437  *     Will extends/reallocae as required automatically.
 438  *     May change skb data pointer and will thus invalidate any check
 439  *     performed for direct packet access.
 440  *     @skb: pointer to skb
 441  *     @len: length of header to be pushed in front
 442  *     @flags: Flags (unused for now)
 443  *     Return: 0 on success or negative error
 444  *
 445  * int bpf_xdp_adjust_head(xdp_md, delta)
 446  *     Adjust the xdp_md.data by delta
 447  *     @xdp_md: pointer to xdp_md
 448  *     @delta: An positive/negative integer to be added to xdp_md.data
 449  *     Return: 0 on success or negative on error
 450  *
 451  * int bpf_probe_read_str(void *dst, int size, const void *unsafe_ptr)
 452  *     Copy a NUL terminated string from unsafe address. In case the string
 453  *     length is smaller than size, the target is not padded with further NUL
 454  *     bytes. In case the string length is larger than size, just count-1
 455  *     bytes are copied and the last byte is set to NUL.
 456  *     @dst: destination address
 457  *     @size: maximum number of bytes to copy, including the trailing NUL
 458  *     @unsafe_ptr: unsafe address
 459  *     Return:
 460  *       > 0 length of the string including the trailing NUL on success
 461  *       < 0 error
 462  */
 463 #define __BPF_FUNC_MAPPER(FN)           \
 464         FN(unspec),                     \
 465         FN(map_lookup_elem),            \
 466         FN(map_update_elem),            \
 467         FN(map_delete_elem),            \
 468         FN(probe_read),                 \
 469         FN(ktime_get_ns),               \
 470         FN(trace_printk),               \
 471         FN(get_prandom_u32),            \
 472         FN(get_smp_processor_id),       \
 473         FN(skb_store_bytes),            \
 474         FN(l3_csum_replace),            \
 475         FN(l4_csum_replace),            \
 476         FN(tail_call),                  \
 477         FN(clone_redirect),             \
 478         FN(get_current_pid_tgid),       \
 479         FN(get_current_uid_gid),        \
 480         FN(get_current_comm),           \
 481         FN(get_cgroup_classid),         \
 482         FN(skb_vlan_push),              \
 483         FN(skb_vlan_pop),               \
 484         FN(skb_get_tunnel_key),         \
 485         FN(skb_set_tunnel_key),         \
 486         FN(perf_event_read),            \
 487         FN(redirect),                   \
 488         FN(get_route_realm),            \
 489         FN(perf_event_output),          \
 490         FN(skb_load_bytes),             \
 491         FN(get_stackid),                \
 492         FN(csum_diff),                  \
 493         FN(skb_get_tunnel_opt),         \
 494         FN(skb_set_tunnel_opt),         \
 495         FN(skb_change_proto),           \
 496         FN(skb_change_type),            \
 497         FN(skb_under_cgroup),           \
 498         FN(get_hash_recalc),            \
 499         FN(get_current_task),           \
 500         FN(probe_write_user),           \
 501         FN(current_task_under_cgroup),  \
 502         FN(skb_change_tail),            \
 503         FN(skb_pull_data),              \
 504         FN(csum_update),                \
 505         FN(set_hash_invalid),           \
 506         FN(get_numa_node_id),           \
 507         FN(skb_change_head),            \
 508         FN(xdp_adjust_head),            \
 509         FN(probe_read_str),             \
 510         FN(get_socket_cookie),
 511
 512 /* integer value in 'imm' field of BPF_CALL instruction selects which helper
 513  * function eBPF program intends to call
 514  */
 515 #define __BPF_ENUM_FN(x) BPF_FUNC_ ## x
 516 enum bpf_func_id {
 517         __BPF_FUNC_MAPPER(__BPF_ENUM_FN)
 518         __BPF_FUNC_MAX_ID,
 519 };
 520 #undef __BPF_ENUM_FN
 521
 522 /* All flags used by eBPF helper functions, placed here. */
 523
 524 /* BPF_FUNC_skb_store_bytes flags. */
 525 #define BPF_F_RECOMPUTE_CSUM            (1ULL << 0)
 526 #define BPF_F_INVALIDATE_HASH           (1ULL << 1)
 527
 528 /* BPF_FUNC_l3_csum_replace and BPF_FUNC_l4_csum_replace flags.
 529  * First 4 bits are for passing the header field size.
 530  */
 531 #define BPF_F_HDR_FIELD_MASK            0xfULL
 532
 533 /* BPF_FUNC_l4_csum_replace flags. */
 534 #define BPF_F_PSEUDO_HDR                (1ULL << 4)
 535 #define BPF_F_MARK_MANGLED_0            (1ULL << 5)
 536 #define BPF_F_MARK_ENFORCE              (1ULL << 6)
 537
 538 /* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */
 539 #define BPF_F_INGRESS                   (1ULL << 0)
 540
 541 /* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */
 542 #define BPF_F_TUNINFO_IPV6              (1ULL << 0)
 543
 544 /* BPF_FUNC_get_stackid flags. */
 545 #define BPF_F_SKIP_FIELD_MASK           0xffULL
 546 #define BPF_F_USER_STACK                (1ULL << 8)
 547 #define BPF_F_FAST_STACK_CMP            (1ULL << 9)
 548 #define BPF_F_REUSE_STACKID             (1ULL << 10)
 549
 550 /* BPF_FUNC_skb_set_tunnel_key flags. */
 551 #define BPF_F_ZERO_CSUM_TX              (1ULL << 1)
 552 #define BPF_F_DONT_FRAGMENT             (1ULL << 2)
 553
 554 /* BPF_FUNC_perf_event_output and BPF_FUNC_perf_event_read flags. */
 555 #define BPF_F_INDEX_MASK                0xffffffffULL
 556 #define BPF_F_CURRENT_CPU               BPF_F_INDEX_MASK
 557 /* BPF_FUNC_perf_event_output for sk_buff input context. */
 558 #define BPF_F_CTXLEN_MASK               (0xfffffULL << 32)
 559
 560 /* user accessible mirror of in-kernel sk_buff.
 561  * new fields can only be added to the end of this structure
 562  */
 563 struct __sk_buff {
 564         __u32 len;
 565         __u32 pkt_type;
 566         __u32 mark;
 567         __u32 queue_mapping;
 568         __u32 protocol;
 569         __u32 vlan_present;
 570         __u32 vlan_tci;
 571         __u32 vlan_proto;
 572         __u32 priority;
 573         __u32 ingress_ifindex;
 574         __u32 ifindex;
 575         __u32 tc_index;
 576         __u32 cb[5];
 577         __u32 hash;
 578         __u32 tc_classid;
 579         __u32 data;
 580         __u32 data_end;
 581 };
 582
 583 struct bpf_tunnel_key {
 584         __u32 tunnel_id;
 585         union {
 586                 __u32 remote_ipv4;
 587                 __u32 remote_ipv6[4];
 588         };
 589         __u8 tunnel_tos;
 590         __u8 tunnel_ttl;
 591         __u16 tunnel_ext;
 592         __u32 tunnel_label;
 593 };
 594
 595 /* Generic BPF return codes which all BPF program types may support.
 596  * The values are binary compatible with their TC_ACT_* counter-part to
 597  * provide backwards compatibility with existing SCHED_CLS and SCHED_ACT
 598  * programs.
 599  *
 600  * XDP is handled seprately, see XDP_*.
 601  */
 602 enum bpf_ret_code {
 603         BPF_OK = 0,
 604         /* 1 reserved */
 605         BPF_DROP = 2,
 606         /* 3-6 reserved */
 607         BPF_REDIRECT = 7,
 608         /* >127 are reserved for prog type specific return codes */
 609 };
 610
 611 struct bpf_sock {
 612         __u32 bound_dev_if;
 613         __u32 family;
 614         __u32 type;
 615         __u32 protocol;
 616 };
 617
 618 #define XDP_PACKET_HEADROOM 256
 619
 620 /* User return codes for XDP prog type.
 621  * A valid XDP program must return one of these defined values. All other
 622  * return codes are reserved for future use. Unknown return codes will result
 623  * in packet drop.
 624  */
 625 enum xdp_action {
 626         XDP_ABORTED = 0,
 627         XDP_DROP,
 628         XDP_PASS,
 629         XDP_TX,
 630 };
 631
 632 /* user accessible metadata for XDP packet hook
 633  * new fields must be added to the end of this structure
 634  */
 635 struct xdp_md {
 636         __u32 data;
 637         __u32 data_end;
 638 };
 639
 640 #endif /* _UAPI__LINUX_BPF_H__ */