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 struct sock;
  25 struct seq_file;
  26 struct btf_type;
  27
  28 /* map is generic key/value storage optionally accesible by eBPF programs */
  29 struct bpf_map_ops {
  30         /* funcs callable from userspace (via syscall) */
  31         int (*map_alloc_check)(union bpf_attr *attr);
  32         struct bpf_map *(*map_alloc)(union bpf_attr *attr);
  33         void (*map_release)(struct bpf_map *map, struct file *map_file);
  34         void (*map_free)(struct bpf_map *map);
  35         int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
  36         void (*map_release_uref)(struct bpf_map *map);
  37
  38         /* funcs callable from userspace and from eBPF programs */
  39         void *(*map_lookup_elem)(struct bpf_map *map, void *key);
  40         int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
  41         int (*map_delete_elem)(struct bpf_map *map, void *key);
  42
  43         /* funcs called by prog_array and perf_event_array map */
  44         void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
  45                                 int fd);
  46         void (*map_fd_put_ptr)(void *ptr);
  47         u32 (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
  48         u32 (*map_fd_sys_lookup_elem)(void *ptr);
  49         void (*map_seq_show_elem)(struct bpf_map *map, void *key,
  50                                   struct seq_file *m);
  51         int (*map_check_btf)(const struct bpf_map *map,
  52                              const struct btf_type *key_type,
  53                              const struct btf_type *value_type);
  54 };
  55
  56 struct bpf_map {
  57         /* The first two cachelines with read-mostly members of which some
  58          * are also accessed in fast-path (e.g. ops, max_entries).
  59          */
  60         const struct bpf_map_ops *ops ____cacheline_aligned;
  61         struct bpf_map *inner_map_meta;
  62 #ifdef CONFIG_SECURITY
  63         void *security;
  64 #endif
  65         enum bpf_map_type map_type;
  66         u32 key_size;
  67         u32 value_size;
  68         u32 max_entries;
  69         u32 map_flags;
  70         u32 pages;
  71         u32 id;
  72         int numa_node;
  73         u32 btf_key_type_id;
  74         u32 btf_value_type_id;
  75         struct btf *btf;
  76         bool unpriv_array;
  77         /* 55 bytes hole */
  78
  79         /* The 3rd and 4th cacheline with misc members to avoid false sharing
  80          * particularly with refcounting.
  81          */
  82         struct user_struct *user ____cacheline_aligned;
  83         atomic_t refcnt;
  84         atomic_t usercnt;
  85         struct work_struct work;
  86         char name[BPF_OBJ_NAME_LEN];
  87 };
  88
  89 struct bpf_offload_dev;
  90 struct bpf_offloaded_map;
  91
  92 struct bpf_map_dev_ops {
  93         int (*map_get_next_key)(struct bpf_offloaded_map *map,
  94                                 void *key, void *next_key);
  95         int (*map_lookup_elem)(struct bpf_offloaded_map *map,
  96                                void *key, void *value);
  97         int (*map_update_elem)(struct bpf_offloaded_map *map,
  98                                void *key, void *value, u64 flags);
  99         int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
 100 };
 101
 102 struct bpf_offloaded_map {
 103         struct bpf_map map;
 104         struct net_device *netdev;
 105         const struct bpf_map_dev_ops *dev_ops;
 106         void *dev_priv;
 107         struct list_head offloads;
 108 };
 109
 110 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
 111 {
 112         return container_of(map, struct bpf_offloaded_map, map);
 113 }
 114
 115 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
 116 {
 117         return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
 118 }
 119
 120 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
 121 {
 122         return map->btf && map->ops->map_seq_show_elem;
 123 }
 124
 125 int map_check_no_btf(const struct bpf_map *map,
 126                      const struct btf_type *key_type,
 127                      const struct btf_type *value_type);
 128
 129 extern const struct bpf_map_ops bpf_map_offload_ops;
 130
 131 /* function argument constraints */
 132 enum bpf_arg_type {
 133         ARG_DONTCARE = 0,       /* unused argument in helper function */
 134
 135         /* the following constraints used to prototype
 136          * bpf_map_lookup/update/delete_elem() functions
 137          */
 138         ARG_CONST_MAP_PTR,      /* const argument used as pointer to bpf_map */
 139         ARG_PTR_TO_MAP_KEY,     /* pointer to stack used as map key */
 140         ARG_PTR_TO_MAP_VALUE,   /* pointer to stack used as map value */
 141
 142         /* the following constraints used to prototype bpf_memcmp() and other
 143          * functions that access data on eBPF program stack
 144          */
 145         ARG_PTR_TO_MEM,         /* pointer to valid memory (stack, packet, map value) */
 146         ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */
 147         ARG_PTR_TO_UNINIT_MEM,  /* pointer to memory does not need to be initialized,
 148                                  * helper function must fill all bytes or clear
 149                                  * them in error case.
 150                                  */
 151
 152         ARG_CONST_SIZE,         /* number of bytes accessed from memory */
 153         ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
 154
 155         ARG_PTR_TO_CTX,         /* pointer to context */
 156         ARG_ANYTHING,           /* any (initialized) argument is ok */
 157 };
 158
 159 /* type of values returned from helper functions */
 160 enum bpf_return_type {
 161         RET_INTEGER,                    /* function returns integer */
 162         RET_VOID,                       /* function doesn't return anything */
 163         RET_PTR_TO_MAP_VALUE,           /* returns a pointer to map elem value */
 164         RET_PTR_TO_MAP_VALUE_OR_NULL,   /* returns a pointer to map elem value or NULL */
 165 };
 166
 167 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
 168  * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
 169  * instructions after verifying
 170  */
 171 struct bpf_func_proto {
 172         u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
 173         bool gpl_only;
 174         bool pkt_access;
 175         enum bpf_return_type ret_type;
 176         enum bpf_arg_type arg1_type;
 177         enum bpf_arg_type arg2_type;
 178         enum bpf_arg_type arg3_type;
 179         enum bpf_arg_type arg4_type;
 180         enum bpf_arg_type arg5_type;
 181 };
 182
 183 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
 184  * the first argument to eBPF programs.
 185  * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
 186  */
 187 struct bpf_context;
 188
 189 enum bpf_access_type {
 190         BPF_READ = 1,
 191         BPF_WRITE = 2
 192 };
 193
 194 /* types of values stored in eBPF registers */
 195 /* Pointer types represent:
 196  * pointer
 197  * pointer + imm
 198  * pointer + (u16) var
 199  * pointer + (u16) var + imm
 200  * if (range > 0) then [ptr, ptr + range - off) is safe to access
 201  * if (id > 0) means that some 'var' was added
 202  * if (off > 0) means that 'imm' was added
 203  */
 204 enum bpf_reg_type {
 205         NOT_INIT = 0,            /* nothing was written into register */
 206         SCALAR_VALUE,            /* reg doesn't contain a valid pointer */
 207         PTR_TO_CTX,              /* reg points to bpf_context */
 208         CONST_PTR_TO_MAP,        /* reg points to struct bpf_map */
 209         PTR_TO_MAP_VALUE,        /* reg points to map element value */
 210         PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */
 211         PTR_TO_STACK,            /* reg == frame_pointer + offset */
 212         PTR_TO_PACKET_META,      /* skb->data - meta_len */
 213         PTR_TO_PACKET,           /* reg points to skb->data */
 214         PTR_TO_PACKET_END,       /* skb->data + headlen */
 215 };
 216
 217 /* The information passed from prog-specific *_is_valid_access
 218  * back to the verifier.
 219  */
 220 struct bpf_insn_access_aux {
 221         enum bpf_reg_type reg_type;
 222         int ctx_field_size;
 223 };
 224
 225 static inline void
 226 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
 227 {
 228         aux->ctx_field_size = size;
 229 }
 230
 231 struct bpf_prog_ops {
 232         int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
 233                         union bpf_attr __user *uattr);
 234 };
 235
 236 struct bpf_verifier_ops {
 237         /* return eBPF function prototype for verification */
 238         const struct bpf_func_proto *
 239         (*get_func_proto)(enum bpf_func_id func_id,
 240                           const struct bpf_prog *prog);
 241
 242         /* return true if 'size' wide access at offset 'off' within bpf_context
 243          * with 'type' (read or write) is allowed
 244          */
 245         bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
 246                                 const struct bpf_prog *prog,
 247                                 struct bpf_insn_access_aux *info);
 248         int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
 249                             const struct bpf_prog *prog);
 250         int (*gen_ld_abs)(const struct bpf_insn *orig,
 251                           struct bpf_insn *insn_buf);
 252         u32 (*convert_ctx_access)(enum bpf_access_type type,
 253                                   const struct bpf_insn *src,
 254                                   struct bpf_insn *dst,
 255                                   struct bpf_prog *prog, u32 *target_size);
 256 };
 257
 258 struct bpf_prog_offload_ops {
 259         int (*insn_hook)(struct bpf_verifier_env *env,
 260                          int insn_idx, int prev_insn_idx);
 261 };
 262
 263 struct bpf_prog_offload {
 264         struct bpf_prog         *prog;
 265         struct net_device       *netdev;
 266         void                    *dev_priv;
 267         struct list_head        offloads;
 268         bool                    dev_state;
 269         const struct bpf_prog_offload_ops *dev_ops;
 270         void                    *jited_image;
 271         u32                     jited_len;
 272 };
 273
 274 struct bpf_prog_aux {
 275         atomic_t refcnt;
 276         u32 used_map_cnt;
 277         u32 max_ctx_offset;
 278         u32 stack_depth;
 279         u32 id;
 280         u32 func_cnt;
 281         bool offload_requested;
 282         struct bpf_prog **func;
 283         void *jit_data; /* JIT specific data. arch dependent */
 284         struct latch_tree_node ksym_tnode;
 285         struct list_head ksym_lnode;
 286         const struct bpf_prog_ops *ops;
 287         struct bpf_map **used_maps;
 288         struct bpf_prog *prog;
 289         struct user_struct *user;
 290         u64 load_time; /* ns since boottime */
 291         struct bpf_map *cgroup_storage;
 292         char name[BPF_OBJ_NAME_LEN];
 293 #ifdef CONFIG_SECURITY
 294         void *security;
 295 #endif
 296         struct bpf_prog_offload *offload;
 297         union {
 298                 struct work_struct work;
 299                 struct rcu_head rcu;
 300         };
 301 };
 302
 303 struct bpf_array {
 304         struct bpf_map map;
 305         u32 elem_size;
 306         u32 index_mask;
 307         /* 'ownership' of prog_array is claimed by the first program that
 308          * is going to use this map or by the first program which FD is stored
 309          * in the map to make sure that all callers and callees have the same
 310          * prog_type and JITed flag
 311          */
 312         enum bpf_prog_type owner_prog_type;
 313         bool owner_jited;
 314         union {
 315                 char value[0] __aligned(8);
 316                 void *ptrs[0] __aligned(8);
 317                 void __percpu *pptrs[0] __aligned(8);
 318         };
 319 };
 320
 321 #define MAX_TAIL_CALL_CNT 32
 322
 323 struct bpf_event_entry {
 324         struct perf_event *event;
 325         struct file *perf_file;
 326         struct file *map_file;
 327         struct rcu_head rcu;
 328 };
 329
 330 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);
 331 int bpf_prog_calc_tag(struct bpf_prog *fp);
 332
 333 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
 334
 335 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
 336                                         unsigned long off, unsigned long len);
 337
 338 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
 339                      void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
 340
 341 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
 342                           union bpf_attr __user *uattr);
 343 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
 344                           union bpf_attr __user *uattr);
 345
 346 /* an array of programs to be executed under rcu_lock.
 347  *
 348  * Typical usage:
 349  * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN);
 350  *
 351  * the structure returned by bpf_prog_array_alloc() should be populated
 352  * with program pointers and the last pointer must be NULL.
 353  * The user has to keep refcnt on the program and make sure the program
 354  * is removed from the array before bpf_prog_put().
 355  * The 'struct bpf_prog_array *' should only be replaced with xchg()
 356  * since other cpus are walking the array of pointers in parallel.
 357  */
 358 struct bpf_prog_array_item {
 359         struct bpf_prog *prog;
 360         struct bpf_cgroup_storage *cgroup_storage;
 361 };
 362
 363 struct bpf_prog_array {
 364         struct rcu_head rcu;
 365         struct bpf_prog_array_item items[0];
 366 };
 367
 368 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
 369 void bpf_prog_array_free(struct bpf_prog_array __rcu *progs);
 370 int bpf_prog_array_length(struct bpf_prog_array __rcu *progs);
 371 int bpf_prog_array_copy_to_user(struct bpf_prog_array __rcu *progs,
 372                                 __u32 __user *prog_ids, u32 cnt);
 373
 374 void bpf_prog_array_delete_safe(struct bpf_prog_array __rcu *progs,
 375                                 struct bpf_prog *old_prog);
 376 int bpf_prog_array_copy_info(struct bpf_prog_array __rcu *array,
 377                              u32 *prog_ids, u32 request_cnt,
 378                              u32 *prog_cnt);
 379 int bpf_prog_array_copy(struct bpf_prog_array __rcu *old_array,
 380                         struct bpf_prog *exclude_prog,
 381                         struct bpf_prog *include_prog,
 382                         struct bpf_prog_array **new_array);
 383
 384 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null)  \
 385         ({                                              \
 386                 struct bpf_prog_array_item *_item;      \
 387                 struct bpf_prog *_prog;                 \
 388                 struct bpf_prog_array *_array;          \
 389                 u32 _ret = 1;                           \
 390                 preempt_disable();                      \
 391                 rcu_read_lock();                        \
 392                 _array = rcu_dereference(array);        \
 393                 if (unlikely(check_non_null && !_array))\
 394                         goto _out;                      \
 395                 _item = &_array->items[0];              \
 396                 while ((_prog = READ_ONCE(_item->prog))) {              \
 397                         bpf_cgroup_storage_set(_item->cgroup_storage);  \
 398                         _ret &= func(_prog, ctx);       \
 399                         _item++;                        \
 400                 }                                       \
 401 _out:                                                   \
 402                 rcu_read_unlock();                      \
 403                 preempt_enable_no_resched();            \
 404                 _ret;                                   \
 405          })
 406
 407 #define BPF_PROG_RUN_ARRAY(array, ctx, func)            \
 408         __BPF_PROG_RUN_ARRAY(array, ctx, func, false)
 409
 410 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func)      \
 411         __BPF_PROG_RUN_ARRAY(array, ctx, func, true)
 412
 413 #ifdef CONFIG_BPF_SYSCALL
 414 DECLARE_PER_CPU(int, bpf_prog_active);
 415
 416 extern const struct file_operations bpf_map_fops;
 417 extern const struct file_operations bpf_prog_fops;
 418
 419 #define BPF_PROG_TYPE(_id, _name) \
 420         extern const struct bpf_prog_ops _name ## _prog_ops; \
 421         extern const struct bpf_verifier_ops _name ## _verifier_ops;
 422 #define BPF_MAP_TYPE(_id, _ops) \
 423         extern const struct bpf_map_ops _ops;
 424 #include <linux/bpf_types.h>
 425 #undef BPF_PROG_TYPE
 426 #undef BPF_MAP_TYPE
 427
 428 extern const struct bpf_prog_ops bpf_offload_prog_ops;
 429 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
 430 extern const struct bpf_verifier_ops xdp_analyzer_ops;
 431
 432 struct bpf_prog *bpf_prog_get(u32 ufd);
 433 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
 434                                        bool attach_drv);
 435 struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, int i);
 436 void bpf_prog_sub(struct bpf_prog *prog, int i);
 437 struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog);
 438 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
 439 void bpf_prog_put(struct bpf_prog *prog);
 440 int __bpf_prog_charge(struct user_struct *user, u32 pages);
 441 void __bpf_prog_uncharge(struct user_struct *user, u32 pages);
 442
 443 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock);
 444 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);
 445
 446 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
 447 struct bpf_map *__bpf_map_get(struct fd f);
 448 struct bpf_map * __must_check bpf_map_inc(struct bpf_map *map, bool uref);
 449 void bpf_map_put_with_uref(struct bpf_map *map);
 450 void bpf_map_put(struct bpf_map *map);
 451 int bpf_map_precharge_memlock(u32 pages);
 452 int bpf_map_charge_memlock(struct bpf_map *map, u32 pages);
 453 void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages);
 454 void *bpf_map_area_alloc(size_t size, int numa_node);
 455 void bpf_map_area_free(void *base);
 456 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
 457
 458 extern int sysctl_unprivileged_bpf_disabled;
 459
 460 int bpf_map_new_fd(struct bpf_map *map, int flags);
 461 int bpf_prog_new_fd(struct bpf_prog *prog);
 462
 463 int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
 464 int bpf_obj_get_user(const char __user *pathname, int flags);
 465
 466 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
 467 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
 468 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
 469                            u64 flags);
 470 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
 471                             u64 flags);
 472
 473 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
 474
 475 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
 476                                  void *key, void *value, u64 map_flags);
 477 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
 478 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
 479                                 void *key, void *value, u64 map_flags);
 480 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
 481
 482 int bpf_get_file_flag(int flags);
 483 int bpf_check_uarg_tail_zero(void __user *uaddr, size_t expected_size,
 484                              size_t actual_size);
 485
 486 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
 487  * forced to use 'long' read/writes to try to atomically copy long counters.
 488  * Best-effort only.  No barriers here, since it _will_ race with concurrent
 489  * updates from BPF programs. Called from bpf syscall and mostly used with
 490  * size 8 or 16 bytes, so ask compiler to inline it.
 491  */
 492 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
 493 {
 494         const long *lsrc = src;
 495         long *ldst = dst;
 496
 497         size /= sizeof(long);
 498         while (size--)
 499                 *ldst++ = *lsrc++;
 500 }
 501
 502 /* verify correctness of eBPF program */
 503 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr);
 504 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
 505
 506 /* Map specifics */
 507 struct xdp_buff;
 508 struct sk_buff;
 509
 510 struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key);
 511 void __dev_map_insert_ctx(struct bpf_map *map, u32 index);
 512 void __dev_map_flush(struct bpf_map *map);
 513 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
 514                     struct net_device *dev_rx);
 515 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
 516                              struct bpf_prog *xdp_prog);
 517
 518 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key);
 519 void __cpu_map_insert_ctx(struct bpf_map *map, u32 index);
 520 void __cpu_map_flush(struct bpf_map *map);
 521 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,
 522                     struct net_device *dev_rx);
 523
 524 /* Return map's numa specified by userspace */
 525 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
 526 {
 527         return (attr->map_flags & BPF_F_NUMA_NODE) ?
 528                 attr->numa_node : NUMA_NO_NODE;
 529 }
 530
 531 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
 532 int array_map_alloc_check(union bpf_attr *attr);
 533
 534 #else /* !CONFIG_BPF_SYSCALL */
 535 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
 536 {
 537         return ERR_PTR(-EOPNOTSUPP);
 538 }
 539
 540 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
 541                                                      enum bpf_prog_type type,
 542                                                      bool attach_drv)
 543 {
 544         return ERR_PTR(-EOPNOTSUPP);
 545 }
 546
 547 static inline struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog,
 548                                                           int i)
 549 {
 550         return ERR_PTR(-EOPNOTSUPP);
 551 }
 552
 553 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
 554 {
 555 }
 556
 557 static inline void bpf_prog_put(struct bpf_prog *prog)
 558 {
 559 }
 560
 561 static inline struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog)
 562 {
 563         return ERR_PTR(-EOPNOTSUPP);
 564 }
 565
 566 static inline struct bpf_prog *__must_check
 567 bpf_prog_inc_not_zero(struct bpf_prog *prog)
 568 {
 569         return ERR_PTR(-EOPNOTSUPP);
 570 }
 571
 572 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages)
 573 {
 574         return 0;
 575 }
 576
 577 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
 578 {
 579 }
 580
 581 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
 582 {
 583         return -EOPNOTSUPP;
 584 }
 585
 586 static inline struct net_device  *__dev_map_lookup_elem(struct bpf_map *map,
 587                                                        u32 key)
 588 {
 589         return NULL;
 590 }
 591
 592 static inline void __dev_map_insert_ctx(struct bpf_map *map, u32 index)
 593 {
 594 }
 595
 596 static inline void __dev_map_flush(struct bpf_map *map)
 597 {
 598 }
 599
 600 struct xdp_buff;
 601 struct bpf_dtab_netdev;
 602
 603 static inline
 604 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
 605                     struct net_device *dev_rx)
 606 {
 607         return 0;
 608 }
 609
 610 struct sk_buff;
 611
 612 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
 613                                            struct sk_buff *skb,
 614                                            struct bpf_prog *xdp_prog)
 615 {
 616         return 0;
 617 }
 618
 619 static inline
 620 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key)
 621 {
 622         return NULL;
 623 }
 624
 625 static inline void __cpu_map_insert_ctx(struct bpf_map *map, u32 index)
 626 {
 627 }
 628
 629 static inline void __cpu_map_flush(struct bpf_map *map)
 630 {
 631 }
 632
 633 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
 634                                   struct xdp_buff *xdp,
 635                                   struct net_device *dev_rx)
 636 {
 637         return 0;
 638 }
 639
 640 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
 641                                 enum bpf_prog_type type)
 642 {
 643         return ERR_PTR(-EOPNOTSUPP);
 644 }
 645 #endif /* CONFIG_BPF_SYSCALL */
 646
 647 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
 648                                                  enum bpf_prog_type type)
 649 {
 650         return bpf_prog_get_type_dev(ufd, type, false);
 651 }
 652
 653 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
 654
 655 int bpf_prog_offload_compile(struct bpf_prog *prog);
 656 void bpf_prog_offload_destroy(struct bpf_prog *prog);
 657 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
 658                                struct bpf_prog *prog);
 659
 660 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
 661
 662 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
 663 int bpf_map_offload_update_elem(struct bpf_map *map,
 664                                 void *key, void *value, u64 flags);
 665 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
 666 int bpf_map_offload_get_next_key(struct bpf_map *map,
 667                                  void *key, void *next_key);
 668
 669 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
 670
 671 struct bpf_offload_dev *bpf_offload_dev_create(void);
 672 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
 673 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
 674                                     struct net_device *netdev);
 675 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
 676                                        struct net_device *netdev);
 677 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
 678
 679 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
 680 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
 681
 682 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
 683 {
 684         return aux->offload_requested;
 685 }
 686
 687 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
 688 {
 689         return unlikely(map->ops == &bpf_map_offload_ops);
 690 }
 691
 692 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
 693 void bpf_map_offload_map_free(struct bpf_map *map);
 694 #else
 695 static inline int bpf_prog_offload_init(struct bpf_prog *prog,
 696                                         union bpf_attr *attr)
 697 {
 698         return -EOPNOTSUPP;
 699 }
 700
 701 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
 702 {
 703         return false;
 704 }
 705
 706 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
 707 {
 708         return false;
 709 }
 710
 711 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
 712 {
 713         return ERR_PTR(-EOPNOTSUPP);
 714 }
 715
 716 static inline void bpf_map_offload_map_free(struct bpf_map *map)
 717 {
 718 }
 719 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
 720
 721 #if defined(CONFIG_STREAM_PARSER) && defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_INET)
 722 struct sock  *__sock_map_lookup_elem(struct bpf_map *map, u32 key);
 723 struct sock  *__sock_hash_lookup_elem(struct bpf_map *map, void *key);
 724 int sock_map_prog(struct bpf_map *map, struct bpf_prog *prog, u32 type);
 725 int sockmap_get_from_fd(const union bpf_attr *attr, int type,
 726                         struct bpf_prog *prog);
 727 #else
 728 static inline struct sock  *__sock_map_lookup_elem(struct bpf_map *map, u32 key)
 729 {
 730         return NULL;
 731 }
 732
 733 static inline struct sock  *__sock_hash_lookup_elem(struct bpf_map *map,
 734                                                     void *key)
 735 {
 736         return NULL;
 737 }
 738
 739 static inline int sock_map_prog(struct bpf_map *map,
 740                                 struct bpf_prog *prog,
 741                                 u32 type)
 742 {
 743         return -EOPNOTSUPP;
 744 }
 745
 746 static inline int sockmap_get_from_fd(const union bpf_attr *attr, int type,
 747                                       struct bpf_prog *prog)
 748 {
 749         return -EINVAL;
 750 }
 751 #endif
 752
 753 #if defined(CONFIG_XDP_SOCKETS)
 754 struct xdp_sock;
 755 struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, u32 key);
 756 int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp,
 757                        struct xdp_sock *xs);
 758 void __xsk_map_flush(struct bpf_map *map);
 759 #else
 760 struct xdp_sock;
 761 static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map,
 762                                                      u32 key)
 763 {
 764         return NULL;
 765 }
 766
 767 static inline int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp,
 768                                      struct xdp_sock *xs)
 769 {
 770         return -EOPNOTSUPP;
 771 }
 772
 773 static inline void __xsk_map_flush(struct bpf_map *map)
 774 {
 775 }
 776 #endif
 777
 778 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
 779 void bpf_sk_reuseport_detach(struct sock *sk);
 780 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
 781                                        void *value);
 782 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
 783                                        void *value, u64 map_flags);
 784 #else
 785 static inline void bpf_sk_reuseport_detach(struct sock *sk)
 786 {
 787 }
 788
 789 #ifdef CONFIG_BPF_SYSCALL
 790 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
 791                                                      void *key, void *value)
 792 {
 793         return -EOPNOTSUPP;
 794 }
 795
 796 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
 797                                                      void *key, void *value,
 798                                                      u64 map_flags)
 799 {
 800         return -EOPNOTSUPP;
 801 }
 802 #endif /* CONFIG_BPF_SYSCALL */
 803 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
 804
 805 /* verifier prototypes for helper functions called from eBPF programs */
 806 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
 807 extern const struct bpf_func_proto bpf_map_update_elem_proto;
 808 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
 809
 810 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
 811 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
 812 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
 813 extern const struct bpf_func_proto bpf_tail_call_proto;
 814 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
 815 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
 816 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
 817 extern const struct bpf_func_proto bpf_get_current_comm_proto;
 818 extern const struct bpf_func_proto bpf_get_stackid_proto;
 819 extern const struct bpf_func_proto bpf_get_stack_proto;
 820 extern const struct bpf_func_proto bpf_sock_map_update_proto;
 821 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
 822 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
 823
 824 extern const struct bpf_func_proto bpf_get_local_storage_proto;
 825
 826 /* Shared helpers among cBPF and eBPF. */
 827 void bpf_user_rnd_init_once(void);
 828 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
 829
 830 #endif /* _LINUX_BPF_H */