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