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 bpf_verifier_env;
  21 struct perf_event;
  22 struct bpf_prog;
  23 struct bpf_map;
  24
  25 /* map is generic key/value storage optionally accesible by eBPF programs */
  26 struct bpf_map_ops {
  27         /* funcs callable from userspace (via syscall) */
  28         int (*map_alloc_check)(union bpf_attr *attr);
  29         struct bpf_map *(*map_alloc)(union bpf_attr *attr);
  30         void (*map_release)(struct bpf_map *map, struct file *map_file);
  31         void (*map_free)(struct bpf_map *map);
  32         int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
  33
  34         /* funcs callable from userspace and from eBPF programs */
  35         void *(*map_lookup_elem)(struct bpf_map *map, void *key);
  36         int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
  37         int (*map_delete_elem)(struct bpf_map *map, void *key);
  38
  39         /* funcs called by prog_array and perf_event_array map */
  40         void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
  41                                 int fd);
  42         void (*map_fd_put_ptr)(void *ptr);
  43         u32 (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
  44         u32 (*map_fd_sys_lookup_elem)(void *ptr);
  45 };
  46
  47 struct bpf_map {
  48         /* 1st cacheline with read-mostly members of which some
  49          * are also accessed in fast-path (e.g. ops, max_entries).
  50          */
  51         const struct bpf_map_ops *ops ____cacheline_aligned;
  52         struct bpf_map *inner_map_meta;
  53 #ifdef CONFIG_SECURITY
  54         void *security;
  55 #endif
  56         enum bpf_map_type map_type;
  57         u32 key_size;
  58         u32 value_size;
  59         u32 max_entries;
  60         u32 map_flags;
  61         u32 pages;
  62         u32 id;
  63         int numa_node;
  64         bool unpriv_array;
  65         /* 7 bytes hole */
  66
  67         /* 2nd cacheline with misc members to avoid false sharing
  68          * particularly with refcounting.
  69          */
  70         struct user_struct *user ____cacheline_aligned;
  71         atomic_t refcnt;
  72         atomic_t usercnt;
  73         struct work_struct work;
  74         char name[BPF_OBJ_NAME_LEN];
  75 };
  76
  77 struct bpf_offloaded_map;
  78
  79 struct bpf_map_dev_ops {
  80         int (*map_get_next_key)(struct bpf_offloaded_map *map,
  81                                 void *key, void *next_key);
  82         int (*map_lookup_elem)(struct bpf_offloaded_map *map,
  83                                void *key, void *value);
  84         int (*map_update_elem)(struct bpf_offloaded_map *map,
  85                                void *key, void *value, u64 flags);
  86         int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
  87 };
  88
  89 struct bpf_offloaded_map {
  90         struct bpf_map map;
  91         struct net_device *netdev;
  92         const struct bpf_map_dev_ops *dev_ops;
  93         void *dev_priv;
  94         struct list_head offloads;
  95 };
  96
  97 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
  98 {
  99         return container_of(map, struct bpf_offloaded_map, map);
 100 }
 101
 102 extern const struct bpf_map_ops bpf_map_offload_ops;
 103
 104 /* function argument constraints */
 105 enum bpf_arg_type {
 106         ARG_DONTCARE = 0,       /* unused argument in helper function */
 107
 108         /* the following constraints used to prototype
 109          * bpf_map_lookup/update/delete_elem() functions
 110          */
 111         ARG_CONST_MAP_PTR,      /* const argument used as pointer to bpf_map */
 112         ARG_PTR_TO_MAP_KEY,     /* pointer to stack used as map key */
 113         ARG_PTR_TO_MAP_VALUE,   /* pointer to stack used as map value */
 114
 115         /* the following constraints used to prototype bpf_memcmp() and other
 116          * functions that access data on eBPF program stack
 117          */
 118         ARG_PTR_TO_MEM,         /* pointer to valid memory (stack, packet, map value) */
 119         ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */
 120         ARG_PTR_TO_UNINIT_MEM,  /* pointer to memory does not need to be initialized,
 121                                  * helper function must fill all bytes or clear
 122                                  * them in error case.
 123                                  */
 124
 125         ARG_CONST_SIZE,         /* number of bytes accessed from memory */
 126         ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
 127
 128         ARG_PTR_TO_CTX,         /* pointer to context */
 129         ARG_ANYTHING,           /* any (initialized) argument is ok */
 130 };
 131
 132 /* type of values returned from helper functions */
 133 enum bpf_return_type {
 134         RET_INTEGER,                    /* function returns integer */
 135         RET_VOID,                       /* function doesn't return anything */
 136         RET_PTR_TO_MAP_VALUE_OR_NULL,   /* returns a pointer to map elem value or NULL */
 137 };
 138
 139 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
 140  * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
 141  * instructions after verifying
 142  */
 143 struct bpf_func_proto {
 144         u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
 145         bool gpl_only;
 146         bool pkt_access;
 147         enum bpf_return_type ret_type;
 148         enum bpf_arg_type arg1_type;
 149         enum bpf_arg_type arg2_type;
 150         enum bpf_arg_type arg3_type;
 151         enum bpf_arg_type arg4_type;
 152         enum bpf_arg_type arg5_type;
 153 };
 154
 155 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
 156  * the first argument to eBPF programs.
 157  * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
 158  */
 159 struct bpf_context;
 160
 161 enum bpf_access_type {
 162         BPF_READ = 1,
 163         BPF_WRITE = 2
 164 };
 165
 166 /* types of values stored in eBPF registers */
 167 /* Pointer types represent:
 168  * pointer
 169  * pointer + imm
 170  * pointer + (u16) var
 171  * pointer + (u16) var + imm
 172  * if (range > 0) then [ptr, ptr + range - off) is safe to access
 173  * if (id > 0) means that some 'var' was added
 174  * if (off > 0) means that 'imm' was added
 175  */
 176 enum bpf_reg_type {
 177         NOT_INIT = 0,            /* nothing was written into register */
 178         SCALAR_VALUE,            /* reg doesn't contain a valid pointer */
 179         PTR_TO_CTX,              /* reg points to bpf_context */
 180         CONST_PTR_TO_MAP,        /* reg points to struct bpf_map */
 181         PTR_TO_MAP_VALUE,        /* reg points to map element value */
 182         PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */
 183         PTR_TO_STACK,            /* reg == frame_pointer + offset */
 184         PTR_TO_PACKET_META,      /* skb->data - meta_len */
 185         PTR_TO_PACKET,           /* reg points to skb->data */
 186         PTR_TO_PACKET_END,       /* skb->data + headlen */
 187 };
 188
 189 /* The information passed from prog-specific *_is_valid_access
 190  * back to the verifier.
 191  */
 192 struct bpf_insn_access_aux {
 193         enum bpf_reg_type reg_type;
 194         int ctx_field_size;
 195 };
 196
 197 static inline void
 198 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
 199 {
 200         aux->ctx_field_size = size;
 201 }
 202
 203 struct bpf_prog_ops {
 204         int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
 205                         union bpf_attr __user *uattr);
 206 };
 207
 208 struct bpf_verifier_ops {
 209         /* return eBPF function prototype for verification */
 210         const struct bpf_func_proto *(*get_func_proto)(enum bpf_func_id func_id);
 211
 212         /* return true if 'size' wide access at offset 'off' within bpf_context
 213          * with 'type' (read or write) is allowed
 214          */
 215         bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
 216                                 struct bpf_insn_access_aux *info);
 217         int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
 218                             const struct bpf_prog *prog);
 219         u32 (*convert_ctx_access)(enum bpf_access_type type,
 220                                   const struct bpf_insn *src,
 221                                   struct bpf_insn *dst,
 222                                   struct bpf_prog *prog, u32 *target_size);
 223 };
 224
 225 struct bpf_prog_offload_ops {
 226         int (*insn_hook)(struct bpf_verifier_env *env,
 227                          int insn_idx, int prev_insn_idx);
 228 };
 229
 230 struct bpf_prog_offload {
 231         struct bpf_prog         *prog;
 232         struct net_device       *netdev;
 233         void                    *dev_priv;
 234         struct list_head        offloads;
 235         bool                    dev_state;
 236         const struct bpf_prog_offload_ops *dev_ops;
 237         void                    *jited_image;
 238         u32                     jited_len;
 239 };
 240
 241 struct bpf_prog_aux {
 242         atomic_t refcnt;
 243         u32 used_map_cnt;
 244         u32 max_ctx_offset;
 245         u32 stack_depth;
 246         u32 id;
 247         u32 func_cnt;
 248         bool offload_requested;
 249         struct bpf_prog **func;
 250         void *jit_data; /* JIT specific data. arch dependent */
 251         struct latch_tree_node ksym_tnode;
 252         struct list_head ksym_lnode;
 253         const struct bpf_prog_ops *ops;
 254         struct bpf_map **used_maps;
 255         struct bpf_prog *prog;
 256         struct user_struct *user;
 257         u64 load_time; /* ns since boottime */
 258         char name[BPF_OBJ_NAME_LEN];
 259 #ifdef CONFIG_SECURITY
 260         void *security;
 261 #endif
 262         struct bpf_prog_offload *offload;
 263         union {
 264                 struct work_struct work;
 265                 struct rcu_head rcu;
 266         };
 267 };
 268
 269 struct bpf_array {
 270         struct bpf_map map;
 271         u32 elem_size;
 272         u32 index_mask;
 273         /* 'ownership' of prog_array is claimed by the first program that
 274          * is going to use this map or by the first program which FD is stored
 275          * in the map to make sure that all callers and callees have the same
 276          * prog_type and JITed flag
 277          */
 278         enum bpf_prog_type owner_prog_type;
 279         bool owner_jited;
 280         union {
 281                 char value[0] __aligned(8);
 282                 void *ptrs[0] __aligned(8);
 283                 void __percpu *pptrs[0] __aligned(8);
 284         };
 285 };
 286
 287 #define MAX_TAIL_CALL_CNT 32
 288
 289 struct bpf_event_entry {
 290         struct perf_event *event;
 291         struct file *perf_file;
 292         struct file *map_file;
 293         struct rcu_head rcu;
 294 };
 295
 296 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);
 297 int bpf_prog_calc_tag(struct bpf_prog *fp);
 298
 299 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
 300
 301 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
 302                                         unsigned long off, unsigned long len);
 303
 304 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
 305                      void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
 306
 307 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
 308                           union bpf_attr __user *uattr);
 309 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
 310                           union bpf_attr __user *uattr);
 311
 312 /* an array of programs to be executed under rcu_lock.
 313  *
 314  * Typical usage:
 315  * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN);
 316  *
 317  * the structure returned by bpf_prog_array_alloc() should be populated
 318  * with program pointers and the last pointer must be NULL.
 319  * The user has to keep refcnt on the program and make sure the program
 320  * is removed from the array before bpf_prog_put().
 321  * The 'struct bpf_prog_array *' should only be replaced with xchg()
 322  * since other cpus are walking the array of pointers in parallel.
 323  */
 324 struct bpf_prog_array {
 325         struct rcu_head rcu;
 326         struct bpf_prog *progs[0];
 327 };
 328
 329 struct bpf_prog_array __rcu *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
 330 void bpf_prog_array_free(struct bpf_prog_array __rcu *progs);
 331 int bpf_prog_array_length(struct bpf_prog_array __rcu *progs);
 332 int bpf_prog_array_copy_to_user(struct bpf_prog_array __rcu *progs,
 333                                 __u32 __user *prog_ids, u32 cnt);
 334
 335 void bpf_prog_array_delete_safe(struct bpf_prog_array __rcu *progs,
 336                                 struct bpf_prog *old_prog);
 337 int bpf_prog_array_copy_info(struct bpf_prog_array __rcu *array,
 338                              __u32 __user *prog_ids, u32 request_cnt,
 339                              __u32 __user *prog_cnt);
 340 int bpf_prog_array_copy(struct bpf_prog_array __rcu *old_array,
 341                         struct bpf_prog *exclude_prog,
 342                         struct bpf_prog *include_prog,
 343                         struct bpf_prog_array **new_array);
 344
 345 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null)  \
 346         ({                                              \
 347                 struct bpf_prog **_prog, *__prog;       \
 348                 struct bpf_prog_array *_array;          \
 349                 u32 _ret = 1;                           \
 350                 rcu_read_lock();                        \
 351                 _array = rcu_dereference(array);        \
 352                 if (unlikely(check_non_null && !_array))\
 353                         goto _out;                      \
 354                 _prog = _array->progs;                  \
 355                 while ((__prog = READ_ONCE(*_prog))) {  \
 356                         _ret &= func(__prog, ctx);      \
 357                         _prog++;                        \
 358                 }                                       \
 359 _out:                                                   \
 360                 rcu_read_unlock();                      \
 361                 _ret;                                   \
 362          })
 363
 364 #define BPF_PROG_RUN_ARRAY(array, ctx, func)            \
 365         __BPF_PROG_RUN_ARRAY(array, ctx, func, false)
 366
 367 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func)      \
 368         __BPF_PROG_RUN_ARRAY(array, ctx, func, true)
 369
 370 #ifdef CONFIG_BPF_SYSCALL
 371 DECLARE_PER_CPU(int, bpf_prog_active);
 372
 373 extern const struct file_operations bpf_map_fops;
 374 extern const struct file_operations bpf_prog_fops;
 375
 376 #define BPF_PROG_TYPE(_id, _name) \
 377         extern const struct bpf_prog_ops _name ## _prog_ops; \
 378         extern const struct bpf_verifier_ops _name ## _verifier_ops;
 379 #define BPF_MAP_TYPE(_id, _ops) \
 380         extern const struct bpf_map_ops _ops;
 381 #include <linux/bpf_types.h>
 382 #undef BPF_PROG_TYPE
 383 #undef BPF_MAP_TYPE
 384
 385 extern const struct bpf_prog_ops bpf_offload_prog_ops;
 386 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
 387 extern const struct bpf_verifier_ops xdp_analyzer_ops;
 388
 389 struct bpf_prog *bpf_prog_get(u32 ufd);
 390 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
 391                                        bool attach_drv);
 392 struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, int i);
 393 void bpf_prog_sub(struct bpf_prog *prog, int i);
 394 struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog);
 395 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
 396 void bpf_prog_put(struct bpf_prog *prog);
 397 int __bpf_prog_charge(struct user_struct *user, u32 pages);
 398 void __bpf_prog_uncharge(struct user_struct *user, u32 pages);
 399
 400 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock);
 401 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);
 402
 403 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
 404 struct bpf_map *__bpf_map_get(struct fd f);
 405 struct bpf_map * __must_check bpf_map_inc(struct bpf_map *map, bool uref);
 406 void bpf_map_put_with_uref(struct bpf_map *map);
 407 void bpf_map_put(struct bpf_map *map);
 408 int bpf_map_precharge_memlock(u32 pages);
 409 void *bpf_map_area_alloc(size_t size, int numa_node);
 410 void bpf_map_area_free(void *base);
 411 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
 412
 413 extern int sysctl_unprivileged_bpf_disabled;
 414
 415 int bpf_map_new_fd(struct bpf_map *map, int flags);
 416 int bpf_prog_new_fd(struct bpf_prog *prog);
 417
 418 int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
 419 int bpf_obj_get_user(const char __user *pathname, int flags);
 420
 421 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
 422 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
 423 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
 424                            u64 flags);
 425 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
 426                             u64 flags);
 427
 428 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
 429
 430 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
 431                                  void *key, void *value, u64 map_flags);
 432 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
 433 void bpf_fd_array_map_clear(struct bpf_map *map);
 434 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
 435                                 void *key, void *value, u64 map_flags);
 436 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
 437
 438 int bpf_get_file_flag(int flags);
 439
 440 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
 441  * forced to use 'long' read/writes to try to atomically copy long counters.
 442  * Best-effort only.  No barriers here, since it _will_ race with concurrent
 443  * updates from BPF programs. Called from bpf syscall and mostly used with
 444  * size 8 or 16 bytes, so ask compiler to inline it.
 445  */
 446 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
 447 {
 448         const long *lsrc = src;
 449         long *ldst = dst;
 450
 451         size /= sizeof(long);
 452         while (size--)
 453                 *ldst++ = *lsrc++;
 454 }
 455
 456 /* verify correctness of eBPF program */
 457 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr);
 458 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
 459
 460 /* Map specifics */
 461 struct net_device  *__dev_map_lookup_elem(struct bpf_map *map, u32 key);
 462 void __dev_map_insert_ctx(struct bpf_map *map, u32 index);
 463 void __dev_map_flush(struct bpf_map *map);
 464
 465 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key);
 466 void __cpu_map_insert_ctx(struct bpf_map *map, u32 index);
 467 void __cpu_map_flush(struct bpf_map *map);
 468 struct xdp_buff;
 469 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,
 470                     struct net_device *dev_rx);
 471
 472 /* Return map's numa specified by userspace */
 473 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
 474 {
 475         return (attr->map_flags & BPF_F_NUMA_NODE) ?
 476                 attr->numa_node : NUMA_NO_NODE;
 477 }
 478
 479 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
 480
 481 #else /* !CONFIG_BPF_SYSCALL */
 482 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
 483 {
 484         return ERR_PTR(-EOPNOTSUPP);
 485 }
 486
 487 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
 488                                                      enum bpf_prog_type type,
 489                                                      bool attach_drv)
 490 {
 491         return ERR_PTR(-EOPNOTSUPP);
 492 }
 493
 494 static inline struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog,
 495                                                           int i)
 496 {
 497         return ERR_PTR(-EOPNOTSUPP);
 498 }
 499
 500 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
 501 {
 502 }
 503
 504 static inline void bpf_prog_put(struct bpf_prog *prog)
 505 {
 506 }
 507
 508 static inline struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog)
 509 {
 510         return ERR_PTR(-EOPNOTSUPP);
 511 }
 512
 513 static inline struct bpf_prog *__must_check
 514 bpf_prog_inc_not_zero(struct bpf_prog *prog)
 515 {
 516         return ERR_PTR(-EOPNOTSUPP);
 517 }
 518
 519 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages)
 520 {
 521         return 0;
 522 }
 523
 524 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
 525 {
 526 }
 527
 528 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
 529 {
 530         return -EOPNOTSUPP;
 531 }
 532
 533 static inline struct net_device  *__dev_map_lookup_elem(struct bpf_map *map,
 534                                                        u32 key)
 535 {
 536         return NULL;
 537 }
 538
 539 static inline void __dev_map_insert_ctx(struct bpf_map *map, u32 index)
 540 {
 541 }
 542
 543 static inline void __dev_map_flush(struct bpf_map *map)
 544 {
 545 }
 546
 547 static inline
 548 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key)
 549 {
 550         return NULL;
 551 }
 552
 553 static inline void __cpu_map_insert_ctx(struct bpf_map *map, u32 index)
 554 {
 555 }
 556
 557 static inline void __cpu_map_flush(struct bpf_map *map)
 558 {
 559 }
 560
 561 struct xdp_buff;
 562 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
 563                                   struct xdp_buff *xdp,
 564                                   struct net_device *dev_rx)
 565 {
 566         return 0;
 567 }
 568
 569 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
 570                                 enum bpf_prog_type type)
 571 {
 572         return ERR_PTR(-EOPNOTSUPP);
 573 }
 574 #endif /* CONFIG_BPF_SYSCALL */
 575
 576 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
 577                                                  enum bpf_prog_type type)
 578 {
 579         return bpf_prog_get_type_dev(ufd, type, false);
 580 }
 581
 582 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
 583
 584 int bpf_prog_offload_compile(struct bpf_prog *prog);
 585 void bpf_prog_offload_destroy(struct bpf_prog *prog);
 586 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
 587                                struct bpf_prog *prog);
 588
 589 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
 590
 591 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
 592 int bpf_map_offload_update_elem(struct bpf_map *map,
 593                                 void *key, void *value, u64 flags);
 594 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
 595 int bpf_map_offload_get_next_key(struct bpf_map *map,
 596                                  void *key, void *next_key);
 597
 598 bool bpf_offload_dev_match(struct bpf_prog *prog, struct bpf_map *map);
 599
 600 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
 601 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
 602
 603 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
 604 {
 605         return aux->offload_requested;
 606 }
 607
 608 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
 609 {
 610         return unlikely(map->ops == &bpf_map_offload_ops);
 611 }
 612
 613 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
 614 void bpf_map_offload_map_free(struct bpf_map *map);
 615 #else
 616 static inline int bpf_prog_offload_init(struct bpf_prog *prog,
 617                                         union bpf_attr *attr)
 618 {
 619         return -EOPNOTSUPP;
 620 }
 621
 622 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
 623 {
 624         return false;
 625 }
 626
 627 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
 628 {
 629         return false;
 630 }
 631
 632 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
 633 {
 634         return ERR_PTR(-EOPNOTSUPP);
 635 }
 636
 637 static inline void bpf_map_offload_map_free(struct bpf_map *map)
 638 {
 639 }
 640 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
 641
 642 #if defined(CONFIG_STREAM_PARSER) && defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_INET)
 643 struct sock  *__sock_map_lookup_elem(struct bpf_map *map, u32 key);
 644 int sock_map_prog(struct bpf_map *map, struct bpf_prog *prog, u32 type);
 645 #else
 646 static inline struct sock  *__sock_map_lookup_elem(struct bpf_map *map, u32 key)
 647 {
 648         return NULL;
 649 }
 650
 651 static inline int sock_map_prog(struct bpf_map *map,
 652                                 struct bpf_prog *prog,
 653                                 u32 type)
 654 {
 655         return -EOPNOTSUPP;
 656 }
 657 #endif
 658
 659 /* verifier prototypes for helper functions called from eBPF programs */
 660 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
 661 extern const struct bpf_func_proto bpf_map_update_elem_proto;
 662 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
 663
 664 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
 665 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
 666 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
 667 extern const struct bpf_func_proto bpf_tail_call_proto;
 668 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
 669 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
 670 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
 671 extern const struct bpf_func_proto bpf_get_current_comm_proto;
 672 extern const struct bpf_func_proto bpf_skb_vlan_push_proto;
 673 extern const struct bpf_func_proto bpf_skb_vlan_pop_proto;
 674 extern const struct bpf_func_proto bpf_get_stackid_proto;
 675 extern const struct bpf_func_proto bpf_sock_map_update_proto;
 676
 677 /* Shared helpers among cBPF and eBPF. */
 678 void bpf_user_rnd_init_once(void);
 679 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
 680
 681 #endif /* _LINUX_BPF_H */