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 /* jmp encodings */
  34 #define BPF_JNE         0x50    /* jump != */
  35 #define BPF_JLT         0xa0    /* LT is unsigned, '<' */
  36 #define BPF_JLE         0xb0    /* LE is unsigned, '<=' */
  37 #define BPF_JSGT        0x60    /* SGT is signed '>', GT in x86 */
  38 #define BPF_JSGE        0x70    /* SGE is signed '>=', GE in x86 */
  39 #define BPF_JSLT        0xc0    /* SLT is signed, '<' */
  40 #define BPF_JSLE        0xd0    /* SLE is signed, '<=' */
  41 #define BPF_CALL        0x80    /* function call */
  42 #define BPF_EXIT        0x90    /* function return */
  43
  44 /* Register numbers */
  45 enum {
  46         BPF_REG_0 = 0,
  47         BPF_REG_1,
  48         BPF_REG_2,
  49         BPF_REG_3,
  50         BPF_REG_4,
  51         BPF_REG_5,
  52         BPF_REG_6,
  53         BPF_REG_7,
  54         BPF_REG_8,
  55         BPF_REG_9,
  56         BPF_REG_10,
  57         __MAX_BPF_REG,
  58 };
  59
  60 /* BPF has 10 general purpose 64-bit registers and stack frame. */
  61 #define MAX_BPF_REG     __MAX_BPF_REG
  62
  63 struct bpf_insn {
  64         __u8    code;           /* opcode */
  65         __u8    dst_reg:4;      /* dest register */
  66         __u8    src_reg:4;      /* source register */
  67         __s16   off;            /* signed offset */
  68         __s32   imm;            /* signed immediate constant */
  69 };
  70
  71 /* Key of an a BPF_MAP_TYPE_LPM_TRIE entry */
  72 struct bpf_lpm_trie_key {
  73         __u32   prefixlen;      /* up to 32 for AF_INET, 128 for AF_INET6 */
  74         __u8    data[0];        /* Arbitrary size */
  75 };
  76
  77 /* BPF syscall commands, see bpf(2) man-page for details. */
  78 enum bpf_cmd {
  79         BPF_MAP_CREATE,
  80         BPF_MAP_LOOKUP_ELEM,
  81         BPF_MAP_UPDATE_ELEM,
  82         BPF_MAP_DELETE_ELEM,
  83         BPF_MAP_GET_NEXT_KEY,
  84         BPF_PROG_LOAD,
  85         BPF_OBJ_PIN,
  86         BPF_OBJ_GET,
  87         BPF_PROG_ATTACH,
  88         BPF_PROG_DETACH,
  89         BPF_PROG_TEST_RUN,
  90         BPF_PROG_GET_NEXT_ID,
  91         BPF_MAP_GET_NEXT_ID,
  92         BPF_PROG_GET_FD_BY_ID,
  93         BPF_MAP_GET_FD_BY_ID,
  94         BPF_OBJ_GET_INFO_BY_FD,
  95 };
  96
  97 enum bpf_map_type {
  98         BPF_MAP_TYPE_UNSPEC,
  99         BPF_MAP_TYPE_HASH,
 100         BPF_MAP_TYPE_ARRAY,
 101         BPF_MAP_TYPE_PROG_ARRAY,
 102         BPF_MAP_TYPE_PERF_EVENT_ARRAY,
 103         BPF_MAP_TYPE_PERCPU_HASH,
 104         BPF_MAP_TYPE_PERCPU_ARRAY,
 105         BPF_MAP_TYPE_STACK_TRACE,
 106         BPF_MAP_TYPE_CGROUP_ARRAY,
 107         BPF_MAP_TYPE_LRU_HASH,
 108         BPF_MAP_TYPE_LRU_PERCPU_HASH,
 109         BPF_MAP_TYPE_LPM_TRIE,
 110         BPF_MAP_TYPE_ARRAY_OF_MAPS,
 111         BPF_MAP_TYPE_HASH_OF_MAPS,
 112         BPF_MAP_TYPE_DEVMAP,
 113         BPF_MAP_TYPE_SOCKMAP,
 114 };
 115
 116 enum bpf_prog_type {
 117         BPF_PROG_TYPE_UNSPEC,
 118         BPF_PROG_TYPE_SOCKET_FILTER,
 119         BPF_PROG_TYPE_KPROBE,
 120         BPF_PROG_TYPE_SCHED_CLS,
 121         BPF_PROG_TYPE_SCHED_ACT,
 122         BPF_PROG_TYPE_TRACEPOINT,
 123         BPF_PROG_TYPE_XDP,
 124         BPF_PROG_TYPE_PERF_EVENT,
 125         BPF_PROG_TYPE_CGROUP_SKB,
 126         BPF_PROG_TYPE_CGROUP_SOCK,
 127         BPF_PROG_TYPE_LWT_IN,
 128         BPF_PROG_TYPE_LWT_OUT,
 129         BPF_PROG_TYPE_LWT_XMIT,
 130         BPF_PROG_TYPE_SOCK_OPS,
 131         BPF_PROG_TYPE_SK_SKB,
 132 };
 133
 134 enum bpf_attach_type {
 135         BPF_CGROUP_INET_INGRESS,
 136         BPF_CGROUP_INET_EGRESS,
 137         BPF_CGROUP_INET_SOCK_CREATE,
 138         BPF_CGROUP_SOCK_OPS,
 139         BPF_SK_SKB_STREAM_PARSER,
 140         BPF_SK_SKB_STREAM_VERDICT,
 141         __MAX_BPF_ATTACH_TYPE
 142 };
 143
 144 #define MAX_BPF_ATTACH_TYPE __MAX_BPF_ATTACH_TYPE
 145
 146 enum bpf_sockmap_flags {
 147         BPF_SOCKMAP_UNSPEC,
 148         BPF_SOCKMAP_STRPARSER,
 149         __MAX_BPF_SOCKMAP_FLAG
 150 };
 151
 152 /* If BPF_F_ALLOW_OVERRIDE flag is used in BPF_PROG_ATTACH command
 153  * to the given target_fd cgroup the descendent cgroup will be able to
 154  * override effective bpf program that was inherited from this cgroup
 155  */
 156 #define BPF_F_ALLOW_OVERRIDE    (1U << 0)
 157
 158 /* If BPF_F_STRICT_ALIGNMENT is used in BPF_PROG_LOAD command, the
 159  * verifier will perform strict alignment checking as if the kernel
 160  * has been built with CONFIG_EFFICIENT_UNALIGNED_ACCESS not set,
 161  * and NET_IP_ALIGN defined to 2.
 162  */
 163 #define BPF_F_STRICT_ALIGNMENT  (1U << 0)
 164
 165 #define BPF_PSEUDO_MAP_FD       1
 166
 167 /* flags for BPF_MAP_UPDATE_ELEM command */
 168 #define BPF_ANY         0 /* create new element or update existing */
 169 #define BPF_NOEXIST     1 /* create new element if it didn't exist */
 170 #define BPF_EXIST       2 /* update existing element */
 171
 172 /* flags for BPF_MAP_CREATE command */
 173 #define BPF_F_NO_PREALLOC       (1U << 0)
 174 /* Instead of having one common LRU list in the
 175  * BPF_MAP_TYPE_LRU_[PERCPU_]HASH map, use a percpu LRU list
 176  * which can scale and perform better.
 177  * Note, the LRU nodes (including free nodes) cannot be moved
 178  * across different LRU lists.
 179  */
 180 #define BPF_F_NO_COMMON_LRU     (1U << 1)
 181 /* Specify numa node during map creation */
 182 #define BPF_F_NUMA_NODE         (1U << 2)
 183
 184 union bpf_attr {
 185         struct { /* anonymous struct used by BPF_MAP_CREATE command */
 186                 __u32   map_type;       /* one of enum bpf_map_type */
 187                 __u32   key_size;       /* size of key in bytes */
 188                 __u32   value_size;     /* size of value in bytes */
 189                 __u32   max_entries;    /* max number of entries in a map */
 190                 __u32   map_flags;      /* BPF_MAP_CREATE related
 191                                          * flags defined above.
 192                                          */
 193                 __u32   inner_map_fd;   /* fd pointing to the inner map */
 194                 __u32   numa_node;      /* numa node (effective only if
 195                                          * BPF_F_NUMA_NODE is set).
 196                                          */
 197         };
 198
 199         struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */
 200                 __u32           map_fd;
 201                 __aligned_u64   key;
 202                 union {
 203                         __aligned_u64 value;
 204                         __aligned_u64 next_key;
 205                 };
 206                 __u64           flags;
 207         };
 208
 209         struct { /* anonymous struct used by BPF_PROG_LOAD command */
 210                 __u32           prog_type;      /* one of enum bpf_prog_type */
 211                 __u32           insn_cnt;
 212                 __aligned_u64   insns;
 213                 __aligned_u64   license;
 214                 __u32           log_level;      /* verbosity level of verifier */
 215                 __u32           log_size;       /* size of user buffer */
 216                 __aligned_u64   log_buf;        /* user supplied buffer */
 217                 __u32           kern_version;   /* checked when prog_type=kprobe */
 218                 __u32           prog_flags;
 219         };
 220
 221         struct { /* anonymous struct used by BPF_OBJ_* commands */
 222                 __aligned_u64   pathname;
 223                 __u32           bpf_fd;
 224         };
 225
 226         struct { /* anonymous struct used by BPF_PROG_ATTACH/DETACH commands */
 227                 __u32           target_fd;      /* container object to attach to */
 228                 __u32           attach_bpf_fd;  /* eBPF program to attach */
 229                 __u32           attach_type;
 230                 __u32           attach_flags;
 231         };
 232
 233         struct { /* anonymous struct used by BPF_PROG_TEST_RUN command */
 234                 __u32           prog_fd;
 235                 __u32           retval;
 236                 __u32           data_size_in;
 237                 __u32           data_size_out;
 238                 __aligned_u64   data_in;
 239                 __aligned_u64   data_out;
 240                 __u32           repeat;
 241                 __u32           duration;
 242         } test;
 243
 244         struct { /* anonymous struct used by BPF_*_GET_*_ID */
 245                 union {
 246                         __u32           start_id;
 247                         __u32           prog_id;
 248                         __u32           map_id;
 249                 };
 250                 __u32           next_id;
 251         };
 252
 253         struct { /* anonymous struct used by BPF_OBJ_GET_INFO_BY_FD */
 254                 __u32           bpf_fd;
 255                 __u32           info_len;
 256                 __aligned_u64   info;
 257         } info;
 258 } __attribute__((aligned(8)));
 259
 260 /* BPF helper function descriptions:
 261  *
 262  * void *bpf_map_lookup_elem(&map, &key)
 263  *     Return: Map value or NULL
 264  *
 265  * int bpf_map_update_elem(&map, &key, &value, flags)
 266  *     Return: 0 on success or negative error
 267  *
 268  * int bpf_map_delete_elem(&map, &key)
 269  *     Return: 0 on success or negative error
 270  *
 271  * int bpf_probe_read(void *dst, int size, void *src)
 272  *     Return: 0 on success or negative error
 273  *
 274  * u64 bpf_ktime_get_ns(void)
 275  *     Return: current ktime
 276  *
 277  * int bpf_trace_printk(const char *fmt, int fmt_size, ...)
 278  *     Return: length of buffer written or negative error
 279  *
 280  * u32 bpf_prandom_u32(void)
 281  *     Return: random value
 282  *
 283  * u32 bpf_raw_smp_processor_id(void)
 284  *     Return: SMP processor ID
 285  *
 286  * int bpf_skb_store_bytes(skb, offset, from, len, flags)
 287  *     store bytes into packet
 288  *     @skb: pointer to skb
 289  *     @offset: offset within packet from skb->mac_header
 290  *     @from: pointer where to copy bytes from
 291  *     @len: number of bytes to store into packet
 292  *     @flags: bit 0 - if true, recompute skb->csum
 293  *             other bits - reserved
 294  *     Return: 0 on success or negative error
 295  *
 296  * int bpf_l3_csum_replace(skb, offset, from, to, flags)
 297  *     recompute IP checksum
 298  *     @skb: pointer to skb
 299  *     @offset: offset within packet where IP checksum is located
 300  *     @from: old value of header field
 301  *     @to: new value of header field
 302  *     @flags: bits 0-3 - size of header field
 303  *             other bits - reserved
 304  *     Return: 0 on success or negative error
 305  *
 306  * int bpf_l4_csum_replace(skb, offset, from, to, flags)
 307  *     recompute TCP/UDP checksum
 308  *     @skb: pointer to skb
 309  *     @offset: offset within packet where TCP/UDP checksum is located
 310  *     @from: old value of header field
 311  *     @to: new value of header field
 312  *     @flags: bits 0-3 - size of header field
 313  *             bit 4 - is pseudo header
 314  *             other bits - reserved
 315  *     Return: 0 on success or negative error
 316  *
 317  * int bpf_tail_call(ctx, prog_array_map, index)
 318  *     jump into another BPF program
 319  *     @ctx: context pointer passed to next program
 320  *     @prog_array_map: pointer to map which type is BPF_MAP_TYPE_PROG_ARRAY
 321  *     @index: index inside array that selects specific program to run
 322  *     Return: 0 on success or negative error
 323  *
 324  * int bpf_clone_redirect(skb, ifindex, flags)
 325  *     redirect to another netdev
 326  *     @skb: pointer to skb
 327  *     @ifindex: ifindex of the net device
 328  *     @flags: bit 0 - if set, redirect to ingress instead of egress
 329  *             other bits - reserved
 330  *     Return: 0 on success or negative error
 331  *
 332  * u64 bpf_get_current_pid_tgid(void)
 333  *     Return: current->tgid << 32 | current->pid
 334  *
 335  * u64 bpf_get_current_uid_gid(void)
 336  *     Return: current_gid << 32 | current_uid
 337  *
 338  * int bpf_get_current_comm(char *buf, int size_of_buf)
 339  *     stores current->comm into buf
 340  *     Return: 0 on success or negative error
 341  *
 342  * u32 bpf_get_cgroup_classid(skb)
 343  *     retrieve a proc's classid
 344  *     @skb: pointer to skb
 345  *     Return: classid if != 0
 346  *
 347  * int bpf_skb_vlan_push(skb, vlan_proto, vlan_tci)
 348  *     Return: 0 on success or negative error
 349  *
 350  * int bpf_skb_vlan_pop(skb)
 351  *     Return: 0 on success or negative error
 352  *
 353  * int bpf_skb_get_tunnel_key(skb, key, size, flags)
 354  * int bpf_skb_set_tunnel_key(skb, key, size, flags)
 355  *     retrieve or populate tunnel metadata
 356  *     @skb: pointer to skb
 357  *     @key: pointer to 'struct bpf_tunnel_key'
 358  *     @size: size of 'struct bpf_tunnel_key'
 359  *     @flags: room for future extensions
 360  *     Return: 0 on success or negative error
 361  *
 362  * u64 bpf_perf_event_read(map, flags)
 363  *     read perf event counter value
 364  *     @map: pointer to perf_event_array map
 365  *     @flags: index of event in the map or bitmask flags
 366  *     Return: value of perf event counter read or error code
 367  *
 368  * int bpf_redirect(ifindex, flags)
 369  *     redirect to another netdev
 370  *     @ifindex: ifindex of the net device
 371  *     @flags: bit 0 - if set, redirect to ingress instead of egress
 372  *             other bits - reserved
 373  *     Return: TC_ACT_REDIRECT
 374  *
 375  * u32 bpf_get_route_realm(skb)
 376  *     retrieve a dst's tclassid
 377  *     @skb: pointer to skb
 378  *     Return: realm if != 0
 379  *
 380  * int bpf_perf_event_output(ctx, map, flags, data, size)
 381  *     output perf raw sample
 382  *     @ctx: struct pt_regs*
 383  *     @map: pointer to perf_event_array map
 384  *     @flags: index of event in the map or bitmask flags
 385  *     @data: data on stack to be output as raw data
 386  *     @size: size of data
 387  *     Return: 0 on success or negative error
 388  *
 389  * int bpf_get_stackid(ctx, map, flags)
 390  *     walk user or kernel stack and return id
 391  *     @ctx: struct pt_regs*
 392  *     @map: pointer to stack_trace map
 393  *     @flags: bits 0-7 - numer of stack frames to skip
 394  *             bit 8 - collect user stack instead of kernel
 395  *             bit 9 - compare stacks by hash only
 396  *             bit 10 - if two different stacks hash into the same stackid
 397  *                      discard old
 398  *             other bits - reserved
 399  *     Return: >= 0 stackid on success or negative error
 400  *
 401  * s64 bpf_csum_diff(from, from_size, to, to_size, seed)
 402  *     calculate csum diff
 403  *     @from: raw from buffer
 404  *     @from_size: length of from buffer
 405  *     @to: raw to buffer
 406  *     @to_size: length of to buffer
 407  *     @seed: optional seed
 408  *     Return: csum result or negative error code
 409  *
 410  * int bpf_skb_get_tunnel_opt(skb, opt, size)
 411  *     retrieve tunnel options metadata
 412  *     @skb: pointer to skb
 413  *     @opt: pointer to raw tunnel option data
 414  *     @size: size of @opt
 415  *     Return: option size
 416  *
 417  * int bpf_skb_set_tunnel_opt(skb, opt, size)
 418  *     populate tunnel options metadata
 419  *     @skb: pointer to skb
 420  *     @opt: pointer to raw tunnel option data
 421  *     @size: size of @opt
 422  *     Return: 0 on success or negative error
 423  *
 424  * int bpf_skb_change_proto(skb, proto, flags)
 425  *     Change protocol of the skb. Currently supported is v4 -> v6,
 426  *     v6 -> v4 transitions. The helper will also resize the skb. eBPF
 427  *     program is expected to fill the new headers via skb_store_bytes
 428  *     and lX_csum_replace.
 429  *     @skb: pointer to skb
 430  *     @proto: new skb->protocol type
 431  *     @flags: reserved
 432  *     Return: 0 on success or negative error
 433  *
 434  * int bpf_skb_change_type(skb, type)
 435  *     Change packet type of skb.
 436  *     @skb: pointer to skb
 437  *     @type: new skb->pkt_type type
 438  *     Return: 0 on success or negative error
 439  *
 440  * int bpf_skb_under_cgroup(skb, map, index)
 441  *     Check cgroup2 membership of skb
 442  *     @skb: pointer to skb
 443  *     @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type
 444  *     @index: index of the cgroup in the bpf_map
 445  *     Return:
 446  *       == 0 skb failed the cgroup2 descendant test
 447  *       == 1 skb succeeded the cgroup2 descendant test
 448  *        < 0 error
 449  *
 450  * u32 bpf_get_hash_recalc(skb)
 451  *     Retrieve and possibly recalculate skb->hash.
 452  *     @skb: pointer to skb
 453  *     Return: hash
 454  *
 455  * u64 bpf_get_current_task(void)
 456  *     Returns current task_struct
 457  *     Return: current
 458  *
 459  * int bpf_probe_write_user(void *dst, void *src, int len)
 460  *     safely attempt to write to a location
 461  *     @dst: destination address in userspace
 462  *     @src: source address on stack
 463  *     @len: number of bytes to copy
 464  *     Return: 0 on success or negative error
 465  *
 466  * int bpf_current_task_under_cgroup(map, index)
 467  *     Check cgroup2 membership of current task
 468  *     @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type
 469  *     @index: index of the cgroup in the bpf_map
 470  *     Return:
 471  *       == 0 current failed the cgroup2 descendant test
 472  *       == 1 current succeeded the cgroup2 descendant test
 473  *        < 0 error
 474  *
 475  * int bpf_skb_change_tail(skb, len, flags)
 476  *     The helper will resize the skb to the given new size, to be used f.e.
 477  *     with control messages.
 478  *     @skb: pointer to skb
 479  *     @len: new skb length
 480  *     @flags: reserved
 481  *     Return: 0 on success or negative error
 482  *
 483  * int bpf_skb_pull_data(skb, len)
 484  *     The helper will pull in non-linear data in case the skb is non-linear
 485  *     and not all of len are part of the linear section. Only needed for
 486  *     read/write with direct packet access.
 487  *     @skb: pointer to skb
 488  *     @len: len to make read/writeable
 489  *     Return: 0 on success or negative error
 490  *
 491  * s64 bpf_csum_update(skb, csum)
 492  *     Adds csum into skb->csum in case of CHECKSUM_COMPLETE.
 493  *     @skb: pointer to skb
 494  *     @csum: csum to add
 495  *     Return: csum on success or negative error
 496  *
 497  * void bpf_set_hash_invalid(skb)
 498  *     Invalidate current skb->hash.
 499  *     @skb: pointer to skb
 500  *
 501  * int bpf_get_numa_node_id()
 502  *     Return: Id of current NUMA node.
 503  *
 504  * int bpf_skb_change_head()
 505  *     Grows headroom of skb and adjusts MAC header offset accordingly.
 506  *     Will extends/reallocae as required automatically.
 507  *     May change skb data pointer and will thus invalidate any check
 508  *     performed for direct packet access.
 509  *     @skb: pointer to skb
 510  *     @len: length of header to be pushed in front
 511  *     @flags: Flags (unused for now)
 512  *     Return: 0 on success or negative error
 513  *
 514  * int bpf_xdp_adjust_head(xdp_md, delta)
 515  *     Adjust the xdp_md.data by delta
 516  *     @xdp_md: pointer to xdp_md
 517  *     @delta: An positive/negative integer to be added to xdp_md.data
 518  *     Return: 0 on success or negative on error
 519  *
 520  * int bpf_probe_read_str(void *dst, int size, const void *unsafe_ptr)
 521  *     Copy a NUL terminated string from unsafe address. In case the string
 522  *     length is smaller than size, the target is not padded with further NUL
 523  *     bytes. In case the string length is larger than size, just count-1
 524  *     bytes are copied and the last byte is set to NUL.
 525  *     @dst: destination address
 526  *     @size: maximum number of bytes to copy, including the trailing NUL
 527  *     @unsafe_ptr: unsafe address
 528  *     Return:
 529  *       > 0 length of the string including the trailing NUL on success
 530  *       < 0 error
 531  *
 532  * u64 bpf_get_socket_cookie(skb)
 533  *     Get the cookie for the socket stored inside sk_buff.
 534  *     @skb: pointer to skb
 535  *     Return: 8 Bytes non-decreasing number on success or 0 if the socket
 536  *     field is missing inside sk_buff
 537  *
 538  * u32 bpf_get_socket_uid(skb)
 539  *     Get the owner uid of the socket stored inside sk_buff.
 540  *     @skb: pointer to skb
 541  *     Return: uid of the socket owner on success or overflowuid if failed.
 542  *
 543  * u32 bpf_set_hash(skb, hash)
 544  *     Set full skb->hash.
 545  *     @skb: pointer to skb
 546  *     @hash: hash to set
 547  *
 548  * int bpf_setsockopt(bpf_socket, level, optname, optval, optlen)
 549  *     Calls setsockopt. Not all opts are available, only those with
 550  *     integer optvals plus TCP_CONGESTION.
 551  *     Supported levels: SOL_SOCKET and IPROTO_TCP
 552  *     @bpf_socket: pointer to bpf_socket
 553  *     @level: SOL_SOCKET or IPROTO_TCP
 554  *     @optname: option name
 555  *     @optval: pointer to option value
 556  *     @optlen: length of optval in byes
 557  *     Return: 0 or negative error
 558  *
 559  * int bpf_skb_adjust_room(skb, len_diff, mode, flags)
 560  *     Grow or shrink room in sk_buff.
 561  *     @skb: pointer to skb
 562  *     @len_diff: (signed) amount of room to grow/shrink
 563  *     @mode: operation mode (enum bpf_adj_room_mode)
 564  *     @flags: reserved for future use
 565  *     Return: 0 on success or negative error code
 566  *
 567  * int bpf_sk_redirect_map(map, key, flags)
 568  *     Redirect skb to a sock in map using key as a lookup key for the
 569  *     sock in map.
 570  *     @map: pointer to sockmap
 571  *     @key: key to lookup sock in map
 572  *     @flags: reserved for future use
 573  *     Return: SK_REDIRECT
 574  *
 575  * int bpf_sock_map_update(skops, map, key, flags)
 576  *      @skops: pointer to bpf_sock_ops
 577  *      @map: pointer to sockmap to update
 578  *      @key: key to insert/update sock in map
 579  *      @flags: same flags as map update elem
 580  */
 581 #define __BPF_FUNC_MAPPER(FN)           \
 582         FN(unspec),                     \
 583         FN(map_lookup_elem),            \
 584         FN(map_update_elem),            \
 585         FN(map_delete_elem),            \
 586         FN(probe_read),                 \
 587         FN(ktime_get_ns),               \
 588         FN(trace_printk),               \
 589         FN(get_prandom_u32),            \
 590         FN(get_smp_processor_id),       \
 591         FN(skb_store_bytes),            \
 592         FN(l3_csum_replace),            \
 593         FN(l4_csum_replace),            \
 594         FN(tail_call),                  \
 595         FN(clone_redirect),             \
 596         FN(get_current_pid_tgid),       \
 597         FN(get_current_uid_gid),        \
 598         FN(get_current_comm),           \
 599         FN(get_cgroup_classid),         \
 600         FN(skb_vlan_push),              \
 601         FN(skb_vlan_pop),               \
 602         FN(skb_get_tunnel_key),         \
 603         FN(skb_set_tunnel_key),         \
 604         FN(perf_event_read),            \
 605         FN(redirect),                   \
 606         FN(get_route_realm),            \
 607         FN(perf_event_output),          \
 608         FN(skb_load_bytes),             \
 609         FN(get_stackid),                \
 610         FN(csum_diff),                  \
 611         FN(skb_get_tunnel_opt),         \
 612         FN(skb_set_tunnel_opt),         \
 613         FN(skb_change_proto),           \
 614         FN(skb_change_type),            \
 615         FN(skb_under_cgroup),           \
 616         FN(get_hash_recalc),            \
 617         FN(get_current_task),           \
 618         FN(probe_write_user),           \
 619         FN(current_task_under_cgroup),  \
 620         FN(skb_change_tail),            \
 621         FN(skb_pull_data),              \
 622         FN(csum_update),                \
 623         FN(set_hash_invalid),           \
 624         FN(get_numa_node_id),           \
 625         FN(skb_change_head),            \
 626         FN(xdp_adjust_head),            \
 627         FN(probe_read_str),             \
 628         FN(get_socket_cookie),          \
 629         FN(get_socket_uid),             \
 630         FN(set_hash),                   \
 631         FN(setsockopt),                 \
 632         FN(skb_adjust_room),            \
 633         FN(redirect_map),               \
 634         FN(sk_redirect_map),            \
 635         FN(sock_map_update),
 636
 637 /* integer value in 'imm' field of BPF_CALL instruction selects which helper
 638  * function eBPF program intends to call
 639  */
 640 #define __BPF_ENUM_FN(x) BPF_FUNC_ ## x
 641 enum bpf_func_id {
 642         __BPF_FUNC_MAPPER(__BPF_ENUM_FN)
 643         __BPF_FUNC_MAX_ID,
 644 };
 645 #undef __BPF_ENUM_FN
 646
 647 /* All flags used by eBPF helper functions, placed here. */
 648
 649 /* BPF_FUNC_skb_store_bytes flags. */
 650 #define BPF_F_RECOMPUTE_CSUM            (1ULL << 0)
 651 #define BPF_F_INVALIDATE_HASH           (1ULL << 1)
 652
 653 /* BPF_FUNC_l3_csum_replace and BPF_FUNC_l4_csum_replace flags.
 654  * First 4 bits are for passing the header field size.
 655  */
 656 #define BPF_F_HDR_FIELD_MASK            0xfULL
 657
 658 /* BPF_FUNC_l4_csum_replace flags. */
 659 #define BPF_F_PSEUDO_HDR                (1ULL << 4)
 660 #define BPF_F_MARK_MANGLED_0            (1ULL << 5)
 661 #define BPF_F_MARK_ENFORCE              (1ULL << 6)
 662
 663 /* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */
 664 #define BPF_F_INGRESS                   (1ULL << 0)
 665
 666 /* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */
 667 #define BPF_F_TUNINFO_IPV6              (1ULL << 0)
 668
 669 /* BPF_FUNC_get_stackid flags. */
 670 #define BPF_F_SKIP_FIELD_MASK           0xffULL
 671 #define BPF_F_USER_STACK                (1ULL << 8)
 672 #define BPF_F_FAST_STACK_CMP            (1ULL << 9)
 673 #define BPF_F_REUSE_STACKID             (1ULL << 10)
 674
 675 /* BPF_FUNC_skb_set_tunnel_key flags. */
 676 #define BPF_F_ZERO_CSUM_TX              (1ULL << 1)
 677 #define BPF_F_DONT_FRAGMENT             (1ULL << 2)
 678
 679 /* BPF_FUNC_perf_event_output and BPF_FUNC_perf_event_read flags. */
 680 #define BPF_F_INDEX_MASK                0xffffffffULL
 681 #define BPF_F_CURRENT_CPU               BPF_F_INDEX_MASK
 682 /* BPF_FUNC_perf_event_output for sk_buff input context. */
 683 #define BPF_F_CTXLEN_MASK               (0xfffffULL << 32)
 684
 685 /* Mode for BPF_FUNC_skb_adjust_room helper. */
 686 enum bpf_adj_room_mode {
 687         BPF_ADJ_ROOM_NET,
 688 };
 689
 690 /* user accessible mirror of in-kernel sk_buff.
 691  * new fields can only be added to the end of this structure
 692  */
 693 struct __sk_buff {
 694         __u32 len;
 695         __u32 pkt_type;
 696         __u32 mark;
 697         __u32 queue_mapping;
 698         __u32 protocol;
 699         __u32 vlan_present;
 700         __u32 vlan_tci;
 701         __u32 vlan_proto;
 702         __u32 priority;
 703         __u32 ingress_ifindex;
 704         __u32 ifindex;
 705         __u32 tc_index;
 706         __u32 cb[5];
 707         __u32 hash;
 708         __u32 tc_classid;
 709         __u32 data;
 710         __u32 data_end;
 711         __u32 napi_id;
 712
 713         /* accessed by BPF_PROG_TYPE_sk_skb types */
 714         __u32 family;
 715         __u32 remote_ip4;       /* Stored in network byte order */
 716         __u32 local_ip4;        /* Stored in network byte order */
 717         __u32 remote_ip6[4];    /* Stored in network byte order */
 718         __u32 local_ip6[4];     /* Stored in network byte order */
 719         __u32 remote_port;      /* Stored in network byte order */
 720         __u32 local_port;       /* stored in host byte order */
 721 };
 722
 723 struct bpf_tunnel_key {
 724         __u32 tunnel_id;
 725         union {
 726                 __u32 remote_ipv4;
 727                 __u32 remote_ipv6[4];
 728         };
 729         __u8 tunnel_tos;
 730         __u8 tunnel_ttl;
 731         __u16 tunnel_ext;
 732         __u32 tunnel_label;
 733 };
 734
 735 /* Generic BPF return codes which all BPF program types may support.
 736  * The values are binary compatible with their TC_ACT_* counter-part to
 737  * provide backwards compatibility with existing SCHED_CLS and SCHED_ACT
 738  * programs.
 739  *
 740  * XDP is handled seprately, see XDP_*.
 741  */
 742 enum bpf_ret_code {
 743         BPF_OK = 0,
 744         /* 1 reserved */
 745         BPF_DROP = 2,
 746         /* 3-6 reserved */
 747         BPF_REDIRECT = 7,
 748         /* >127 are reserved for prog type specific return codes */
 749 };
 750
 751 struct bpf_sock {
 752         __u32 bound_dev_if;
 753         __u32 family;
 754         __u32 type;
 755         __u32 protocol;
 756 };
 757
 758 #define XDP_PACKET_HEADROOM 256
 759
 760 /* User return codes for XDP prog type.
 761  * A valid XDP program must return one of these defined values. All other
 762  * return codes are reserved for future use. Unknown return codes will result
 763  * in packet drop.
 764  */
 765 enum xdp_action {
 766         XDP_ABORTED = 0,
 767         XDP_DROP,
 768         XDP_PASS,
 769         XDP_TX,
 770 };
 771
 772 /* user accessible metadata for XDP packet hook
 773  * new fields must be added to the end of this structure
 774  */
 775 struct xdp_md {
 776         __u32 data;
 777         __u32 data_end;
 778 };
 779
 780 enum sk_action {
 781         SK_ABORTED = 0,
 782         SK_DROP,
 783         SK_REDIRECT,
 784 };
 785
 786 #define BPF_TAG_SIZE    8
 787
 788 struct bpf_prog_info {
 789         __u32 type;
 790         __u32 id;
 791         __u8  tag[BPF_TAG_SIZE];
 792         __u32 jited_prog_len;
 793         __u32 xlated_prog_len;
 794         __aligned_u64 jited_prog_insns;
 795         __aligned_u64 xlated_prog_insns;
 796 } __attribute__((aligned(8)));
 797
 798 struct bpf_map_info {
 799         __u32 type;
 800         __u32 id;
 801         __u32 key_size;
 802         __u32 value_size;
 803         __u32 max_entries;
 804         __u32 map_flags;
 805 } __attribute__((aligned(8)));
 806
 807 /* User bpf_sock_ops struct to access socket values and specify request ops
 808  * and their replies.
 809  * Some of this fields are in network (bigendian) byte order and may need
 810  * to be converted before use (bpf_ntohl() defined in samples/bpf/bpf_endian.h).
 811  * New fields can only be added at the end of this structure
 812  */
 813 struct bpf_sock_ops {
 814         __u32 op;
 815         union {
 816                 __u32 reply;
 817                 __u32 replylong[4];
 818         };
 819         __u32 family;
 820         __u32 remote_ip4;       /* Stored in network byte order */
 821         __u32 local_ip4;        /* Stored in network byte order */
 822         __u32 remote_ip6[4];    /* Stored in network byte order */
 823         __u32 local_ip6[4];     /* Stored in network byte order */
 824         __u32 remote_port;      /* Stored in network byte order */
 825         __u32 local_port;       /* stored in host byte order */
 826 };
 827
 828 /* List of known BPF sock_ops operators.
 829  * New entries can only be added at the end
 830  */
 831 enum {
 832         BPF_SOCK_OPS_VOID,
 833         BPF_SOCK_OPS_TIMEOUT_INIT,      /* Should return SYN-RTO value to use or
 834                                          * -1 if default value should be used
 835                                          */
 836         BPF_SOCK_OPS_RWND_INIT,         /* Should return initial advertized
 837                                          * window (in packets) or -1 if default
 838                                          * value should be used
 839                                          */
 840         BPF_SOCK_OPS_TCP_CONNECT_CB,    /* Calls BPF program right before an
 841                                          * active connection is initialized
 842                                          */
 843         BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB,     /* Calls BPF program when an
 844                                                  * active connection is
 845                                                  * established
 846                                                  */
 847         BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB,    /* Calls BPF program when a
 848                                                  * passive connection is
 849                                                  * established
 850                                                  */
 851         BPF_SOCK_OPS_NEEDS_ECN,         /* If connection's congestion control
 852                                          * needs ECN
 853                                          */
 854 };
 855
 856 #define TCP_BPF_IW              1001    /* Set TCP initial congestion window */
 857 #define TCP_BPF_SNDCWND_CLAMP   1002    /* Set sndcwnd_clamp */
 858
 859 #endif /* _UAPI__LINUX_BPF_H__ */