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