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