include/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 _LINUX_BPF_H
   8 #define _LINUX_BPF_H 1
   9
  10 #include <uapi/linux/bpf.h>
  11
  12 #include <linux/workqueue.h>
  13 #include <linux/file.h>
  14 #include <linux/percpu.h>
  15 #include <linux/err.h>
  16 #include <linux/rbtree_latch.h>
  17 #include <linux/numa.h>
  18 #include <linux/wait.h>
  19
  20 struct perf_event;
  21 struct bpf_prog;
  22 struct bpf_map;
  23
  24 /* map is generic key/value storage optionally accesible by eBPF programs */
  25 struct bpf_map_ops {
  26         /* funcs callable from userspace (via syscall) */
  27         struct bpf_map *(*map_alloc)(union bpf_attr *attr);
  28         void (*map_release)(struct bpf_map *map, struct file *map_file);
  29         void (*map_free)(struct bpf_map *map);
  30         int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
  31
  32         /* funcs callable from userspace and from eBPF programs */
  33         void *(*map_lookup_elem)(struct bpf_map *map, void *key);
  34         int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
  35         int (*map_delete_elem)(struct bpf_map *map, void *key);
  36
  37         /* funcs called by prog_array and perf_event_array map */
  38         void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
  39                                 int fd);
  40         void (*map_fd_put_ptr)(void *ptr);
  41         u32 (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
  42         u32 (*map_fd_sys_lookup_elem)(void *ptr);
  43 };
  44
  45 struct bpf_map {
  46         /* 1st cacheline with read-mostly members of which some
  47          * are also accessed in fast-path (e.g. ops, max_entries).
  48          */
  49         const struct bpf_map_ops *ops ____cacheline_aligned;
  50         struct bpf_map *inner_map_meta;
  51 #ifdef CONFIG_SECURITY
  52         void *security;
  53 #endif
  54         enum bpf_map_type map_type;
  55         u32 key_size;
  56         u32 value_size;
  57         u32 max_entries;
  58         u32 map_flags;
  59         u32 pages;
  60         u32 id;
  61         int numa_node;
  62         bool unpriv_array;
  63         /* 7 bytes hole */
  64
  65         /* 2nd cacheline with misc members to avoid false sharing
  66          * particularly with refcounting.
  67          */
  68         struct user_struct *user ____cacheline_aligned;
  69         atomic_t refcnt;
  70         atomic_t usercnt;
  71         struct work_struct work;
  72         char name[BPF_OBJ_NAME_LEN];
  73 };
  74
  75 /* function argument constraints */
  76 enum bpf_arg_type {
  77         ARG_DONTCARE = 0,       /* unused argument in helper function */
  78
  79         /* the following constraints used to prototype
  80          * bpf_map_lookup/update/delete_elem() functions
  81          */
  82         ARG_CONST_MAP_PTR,      /* const argument used as pointer to bpf_map */
  83         ARG_PTR_TO_MAP_KEY,     /* pointer to stack used as map key */
  84         ARG_PTR_TO_MAP_VALUE,   /* pointer to stack used as map value */
  85
  86         /* the following constraints used to prototype bpf_memcmp() and other
  87          * functions that access data on eBPF program stack
  88          */
  89         ARG_PTR_TO_MEM,         /* pointer to valid memory (stack, packet, map value) */
  90         ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */
  91         ARG_PTR_TO_UNINIT_MEM,  /* pointer to memory does not need to be initialized,
  92                                  * helper function must fill all bytes or clear
  93                                  * them in error case.
  94                                  */
  95
  96         ARG_CONST_SIZE,         /* number of bytes accessed from memory */
  97         ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
  98
  99         ARG_PTR_TO_CTX,         /* pointer to context */
 100         ARG_ANYTHING,           /* any (initialized) argument is ok */
 101 };
 102
 103 /* type of values returned from helper functions */
 104 enum bpf_return_type {
 105         RET_INTEGER,                    /* function returns integer */
 106         RET_VOID,                       /* function doesn't return anything */
 107         RET_PTR_TO_MAP_VALUE_OR_NULL,   /* returns a pointer to map elem value or NULL */
 108 };
 109
 110 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
 111  * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
 112  * instructions after verifying
 113  */
 114 struct bpf_func_proto {
 115         u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
 116         bool gpl_only;
 117         bool pkt_access;
 118         enum bpf_return_type ret_type;
 119         enum bpf_arg_type arg1_type;
 120         enum bpf_arg_type arg2_type;
 121         enum bpf_arg_type arg3_type;
 122         enum bpf_arg_type arg4_type;
 123         enum bpf_arg_type arg5_type;
 124 };
 125
 126 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
 127  * the first argument to eBPF programs.
 128  * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
 129  */
 130 struct bpf_context;
 131
 132 enum bpf_access_type {
 133         BPF_READ = 1,
 134         BPF_WRITE = 2
 135 };
 136
 137 /* types of values stored in eBPF registers */
 138 /* Pointer types represent:
 139  * pointer
 140  * pointer + imm
 141  * pointer + (u16) var
 142  * pointer + (u16) var + imm
 143  * if (range > 0) then [ptr, ptr + range - off) is safe to access
 144  * if (id > 0) means that some 'var' was added
 145  * if (off > 0) means that 'imm' was added
 146  */
 147 enum bpf_reg_type {
 148         NOT_INIT = 0,            /* nothing was written into register */
 149         SCALAR_VALUE,            /* reg doesn't contain a valid pointer */
 150         PTR_TO_CTX,              /* reg points to bpf_context */
 151         CONST_PTR_TO_MAP,        /* reg points to struct bpf_map */
 152         PTR_TO_MAP_VALUE,        /* reg points to map element value */
 153         PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */
 154         PTR_TO_STACK,            /* reg == frame_pointer + offset */
 155         PTR_TO_PACKET_META,      /* skb->data - meta_len */
 156         PTR_TO_PACKET,           /* reg points to skb->data */
 157         PTR_TO_PACKET_END,       /* skb->data + headlen */
 158 };
 159
 160 /* The information passed from prog-specific *_is_valid_access
 161  * back to the verifier.
 162  */
 163 struct bpf_insn_access_aux {
 164         enum bpf_reg_type reg_type;
 165         int ctx_field_size;
 166 };
 167
 168 static inline void
 169 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
 170 {
 171         aux->ctx_field_size = size;
 172 }
 173
 174 struct bpf_prog_ops {
 175         int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
 176                         union bpf_attr __user *uattr);
 177 };
 178
 179 struct bpf_verifier_ops {
 180         /* return eBPF function prototype for verification */
 181         const struct bpf_func_proto *(*get_func_proto)(enum bpf_func_id func_id);
 182
 183         /* return true if 'size' wide access at offset 'off' within bpf_context
 184          * with 'type' (read or write) is allowed
 185          */
 186         bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
 187                                 struct bpf_insn_access_aux *info);
 188         int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
 189                             const struct bpf_prog *prog);
 190         u32 (*convert_ctx_access)(enum bpf_access_type type,
 191                                   const struct bpf_insn *src,
 192                                   struct bpf_insn *dst,
 193                                   struct bpf_prog *prog, u32 *target_size);
 194 };
 195
 196 struct bpf_dev_offload {
 197         struct bpf_prog         *prog;
 198         struct net_device       *netdev;
 199         void                    *dev_priv;
 200         struct list_head        offloads;
 201         bool                    dev_state;
 202         bool                    verifier_running;
 203         wait_queue_head_t       verifier_done;
 204 };
 205
 206 struct bpf_prog_aux {
 207         atomic_t refcnt;
 208         u32 used_map_cnt;
 209         u32 max_ctx_offset;
 210         u32 stack_depth;
 211         u32 id;
 212         struct latch_tree_node ksym_tnode;
 213         struct list_head ksym_lnode;
 214         const struct bpf_prog_ops *ops;
 215         struct bpf_map **used_maps;
 216         struct bpf_prog *prog;
 217         struct user_struct *user;
 218         u64 load_time; /* ns since boottime */
 219         char name[BPF_OBJ_NAME_LEN];
 220 #ifdef CONFIG_SECURITY
 221         void *security;
 222 #endif
 223         struct bpf_dev_offload *offload;
 224         union {
 225                 struct work_struct work;
 226                 struct rcu_head rcu;
 227         };
 228 };
 229
 230 struct bpf_array {
 231         struct bpf_map map;
 232         u32 elem_size;
 233         u32 index_mask;
 234         /* 'ownership' of prog_array is claimed by the first program that
 235          * is going to use this map or by the first program which FD is stored
 236          * in the map to make sure that all callers and callees have the same
 237          * prog_type and JITed flag
 238          */
 239         enum bpf_prog_type owner_prog_type;
 240         bool owner_jited;
 241         union {
 242                 char value[0] __aligned(8);
 243                 void *ptrs[0] __aligned(8);
 244                 void __percpu *pptrs[0] __aligned(8);
 245         };
 246 };
 247
 248 #define MAX_TAIL_CALL_CNT 32
 249
 250 struct bpf_event_entry {
 251         struct perf_event *event;
 252         struct file *perf_file;
 253         struct file *map_file;
 254         struct rcu_head rcu;
 255 };
 256
 257 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);
 258 int bpf_prog_calc_tag(struct bpf_prog *fp);
 259
 260 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
 261
 262 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
 263                                         unsigned long off, unsigned long len);
 264
 265 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
 266                      void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
 267
 268 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
 269                           union bpf_attr __user *uattr);
 270 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
 271                           union bpf_attr __user *uattr);
 272
 273 /* an array of programs to be executed under rcu_lock.
 274  *
 275  * Typical usage:
 276  * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN);
 277  *
 278  * the structure returned by bpf_prog_array_alloc() should be populated
 279  * with program pointers and the last pointer must be NULL.
 280  * The user has to keep refcnt on the program and make sure the program
 281  * is removed from the array before bpf_prog_put().
 282  * The 'struct bpf_prog_array *' should only be replaced with xchg()
 283  * since other cpus are walking the array of pointers in parallel.
 284  */
 285 struct bpf_prog_array {
 286         struct rcu_head rcu;
 287         struct bpf_prog *progs[0];
 288 };
 289
 290 struct bpf_prog_array __rcu *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
 291 void bpf_prog_array_free(struct bpf_prog_array __rcu *progs);
 292 int bpf_prog_array_length(struct bpf_prog_array __rcu *progs);
 293 int bpf_prog_array_copy_to_user(struct bpf_prog_array __rcu *progs,
 294                                 __u32 __user *prog_ids, u32 cnt);
 295
 296 void bpf_prog_array_delete_safe(struct bpf_prog_array __rcu *progs,
 297                                 struct bpf_prog *old_prog);
 298 int bpf_prog_array_copy(struct bpf_prog_array __rcu *old_array,
 299                         struct bpf_prog *exclude_prog,
 300                         struct bpf_prog *include_prog,
 301                         struct bpf_prog_array **new_array);
 302
 303 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null)  \
 304         ({                                              \
 305                 struct bpf_prog **_prog, *__prog;       \
 306                 struct bpf_prog_array *_array;          \
 307                 u32 _ret = 1;                           \
 308                 rcu_read_lock();                        \
 309                 _array = rcu_dereference(array);        \
 310                 if (unlikely(check_non_null && !_array))\
 311                         goto _out;                      \
 312                 _prog = _array->progs;                  \
 313                 while ((__prog = READ_ONCE(*_prog))) {  \
 314                         _ret &= func(__prog, ctx);      \
 315                         _prog++;                        \
 316                 }                                       \
 317 _out:                                                   \
 318                 rcu_read_unlock();                      \
 319                 _ret;                                   \
 320          })
 321
 322 #define BPF_PROG_RUN_ARRAY(array, ctx, func)            \
 323         __BPF_PROG_RUN_ARRAY(array, ctx, func, false)
 324
 325 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func)      \
 326         __BPF_PROG_RUN_ARRAY(array, ctx, func, true)
 327
 328 #ifdef CONFIG_BPF_SYSCALL
 329 DECLARE_PER_CPU(int, bpf_prog_active);
 330
 331 extern const struct file_operations bpf_map_fops;
 332 extern const struct file_operations bpf_prog_fops;
 333
 334 #define BPF_PROG_TYPE(_id, _name) \
 335         extern const struct bpf_prog_ops _name ## _prog_ops; \
 336         extern const struct bpf_verifier_ops _name ## _verifier_ops;
 337 #define BPF_MAP_TYPE(_id, _ops) \
 338         extern const struct bpf_map_ops _ops;
 339 #include <linux/bpf_types.h>
 340 #undef BPF_PROG_TYPE
 341 #undef BPF_MAP_TYPE
 342
 343 extern const struct bpf_prog_ops bpf_offload_prog_ops;
 344 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
 345 extern const struct bpf_verifier_ops xdp_analyzer_ops;
 346
 347 struct bpf_prog *bpf_prog_get(u32 ufd);
 348 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
 349                                        bool attach_drv);
 350 struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, int i);
 351 void bpf_prog_sub(struct bpf_prog *prog, int i);
 352 struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog);
 353 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
 354 void bpf_prog_put(struct bpf_prog *prog);
 355 int __bpf_prog_charge(struct user_struct *user, u32 pages);
 356 void __bpf_prog_uncharge(struct user_struct *user, u32 pages);
 357
 358 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
 359 struct bpf_map *__bpf_map_get(struct fd f);
 360 struct bpf_map * __must_check bpf_map_inc(struct bpf_map *map, bool uref);
 361 void bpf_map_put_with_uref(struct bpf_map *map);
 362 void bpf_map_put(struct bpf_map *map);
 363 int bpf_map_precharge_memlock(u32 pages);
 364 void *bpf_map_area_alloc(size_t size, int numa_node);
 365 void bpf_map_area_free(void *base);
 366
 367 extern int sysctl_unprivileged_bpf_disabled;
 368
 369 int bpf_map_new_fd(struct bpf_map *map, int flags);
 370 int bpf_prog_new_fd(struct bpf_prog *prog);
 371
 372 int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
 373 int bpf_obj_get_user(const char __user *pathname, int flags);
 374
 375 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
 376 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
 377 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
 378                            u64 flags);
 379 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
 380                             u64 flags);
 381
 382 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
 383
 384 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
 385                                  void *key, void *value, u64 map_flags);
 386 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
 387 void bpf_fd_array_map_clear(struct bpf_map *map);
 388 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
 389                                 void *key, void *value, u64 map_flags);
 390 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
 391
 392 int bpf_get_file_flag(int flags);
 393
 394 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
 395  * forced to use 'long' read/writes to try to atomically copy long counters.
 396  * Best-effort only.  No barriers here, since it _will_ race with concurrent
 397  * updates from BPF programs. Called from bpf syscall and mostly used with
 398  * size 8 or 16 bytes, so ask compiler to inline it.
 399  */
 400 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
 401 {
 402         const long *lsrc = src;
 403         long *ldst = dst;
 404
 405         size /= sizeof(long);
 406         while (size--)
 407                 *ldst++ = *lsrc++;
 408 }
 409
 410 /* verify correctness of eBPF program */
 411 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr);
 412
 413 /* Map specifics */
 414 struct net_device  *__dev_map_lookup_elem(struct bpf_map *map, u32 key);
 415 void __dev_map_insert_ctx(struct bpf_map *map, u32 index);
 416 void __dev_map_flush(struct bpf_map *map);
 417
 418 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key);
 419 void __cpu_map_insert_ctx(struct bpf_map *map, u32 index);
 420 void __cpu_map_flush(struct bpf_map *map);
 421 struct xdp_buff;
 422 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,
 423                     struct net_device *dev_rx);
 424
 425 /* Return map's numa specified by userspace */
 426 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
 427 {
 428         return (attr->map_flags & BPF_F_NUMA_NODE) ?
 429                 attr->numa_node : NUMA_NO_NODE;
 430 }
 431
 432 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
 433
 434 #else /* !CONFIG_BPF_SYSCALL */
 435 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
 436 {
 437         return ERR_PTR(-EOPNOTSUPP);
 438 }
 439
 440 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
 441                                                      enum bpf_prog_type type,
 442                                                      bool attach_drv)
 443 {
 444         return ERR_PTR(-EOPNOTSUPP);
 445 }
 446
 447 static inline struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog,
 448                                                           int i)
 449 {
 450         return ERR_PTR(-EOPNOTSUPP);
 451 }
 452
 453 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
 454 {
 455 }
 456
 457 static inline void bpf_prog_put(struct bpf_prog *prog)
 458 {
 459 }
 460
 461 static inline struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog)
 462 {
 463         return ERR_PTR(-EOPNOTSUPP);
 464 }
 465
 466 static inline struct bpf_prog *__must_check
 467 bpf_prog_inc_not_zero(struct bpf_prog *prog)
 468 {
 469         return ERR_PTR(-EOPNOTSUPP);
 470 }
 471
 472 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages)
 473 {
 474         return 0;
 475 }
 476
 477 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
 478 {
 479 }
 480
 481 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
 482 {
 483         return -EOPNOTSUPP;
 484 }
 485
 486 static inline struct net_device  *__dev_map_lookup_elem(struct bpf_map *map,
 487                                                        u32 key)
 488 {
 489         return NULL;
 490 }
 491
 492 static inline void __dev_map_insert_ctx(struct bpf_map *map, u32 index)
 493 {
 494 }
 495
 496 static inline void __dev_map_flush(struct bpf_map *map)
 497 {
 498 }
 499
 500 static inline
 501 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key)
 502 {
 503         return NULL;
 504 }
 505
 506 static inline void __cpu_map_insert_ctx(struct bpf_map *map, u32 index)
 507 {
 508 }
 509
 510 static inline void __cpu_map_flush(struct bpf_map *map)
 511 {
 512 }
 513
 514 struct xdp_buff;
 515 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
 516                                   struct xdp_buff *xdp,
 517                                   struct net_device *dev_rx)
 518 {
 519         return 0;
 520 }
 521
 522 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
 523                                 enum bpf_prog_type type)
 524 {
 525         return ERR_PTR(-EOPNOTSUPP);
 526 }
 527 #endif /* CONFIG_BPF_SYSCALL */
 528
 529 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
 530                                                  enum bpf_prog_type type)
 531 {
 532         return bpf_prog_get_type_dev(ufd, type, false);
 533 }
 534
 535 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
 536
 537 int bpf_prog_offload_compile(struct bpf_prog *prog);
 538 void bpf_prog_offload_destroy(struct bpf_prog *prog);
 539
 540 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
 541 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
 542
 543 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
 544 {
 545         return aux->offload;
 546 }
 547 #else
 548 static inline int bpf_prog_offload_init(struct bpf_prog *prog,
 549                                         union bpf_attr *attr)
 550 {
 551         return -EOPNOTSUPP;
 552 }
 553
 554 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
 555 {
 556         return false;
 557 }
 558 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
 559
 560 #if defined(CONFIG_STREAM_PARSER) && defined(CONFIG_BPF_SYSCALL)
 561 struct sock  *__sock_map_lookup_elem(struct bpf_map *map, u32 key);
 562 int sock_map_prog(struct bpf_map *map, struct bpf_prog *prog, u32 type);
 563 #else
 564 static inline struct sock  *__sock_map_lookup_elem(struct bpf_map *map, u32 key)
 565 {
 566         return NULL;
 567 }
 568
 569 static inline int sock_map_prog(struct bpf_map *map,
 570                                 struct bpf_prog *prog,
 571                                 u32 type)
 572 {
 573         return -EOPNOTSUPP;
 574 }
 575 #endif
 576
 577 /* verifier prototypes for helper functions called from eBPF programs */
 578 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
 579 extern const struct bpf_func_proto bpf_map_update_elem_proto;
 580 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
 581
 582 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
 583 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
 584 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
 585 extern const struct bpf_func_proto bpf_tail_call_proto;
 586 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
 587 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
 588 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
 589 extern const struct bpf_func_proto bpf_get_current_comm_proto;
 590 extern const struct bpf_func_proto bpf_skb_vlan_push_proto;
 591 extern const struct bpf_func_proto bpf_skb_vlan_pop_proto;
 592 extern const struct bpf_func_proto bpf_get_stackid_proto;
 593 extern const struct bpf_func_proto bpf_sock_map_update_proto;
 594
 595 /* Shared helpers among cBPF and eBPF. */
 596 void bpf_user_rnd_init_once(void);
 597 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
 598
 599 #endif /* _LINUX_BPF_H */