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