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 }; 238 239 struct bpf_prog_aux { 240 atomic_t refcnt; 241 u32 used_map_cnt; 242 u32 max_ctx_offset; 243 u32 stack_depth; 244 u32 id; 245 u32 func_cnt; 246 bool offload_requested; 247 struct bpf_prog **func; 248 void *jit_data; /* JIT specific data. arch dependent */ 249 struct latch_tree_node ksym_tnode; 250 struct list_head ksym_lnode; 251 const struct bpf_prog_ops *ops; 252 struct bpf_map **used_maps; 253 struct bpf_prog *prog; 254 struct user_struct *user; 255 u64 load_time; /* ns since boottime */ 256 char name[BPF_OBJ_NAME_LEN]; 257 #ifdef CONFIG_SECURITY 258 void *security; 259 #endif 260 struct bpf_prog_offload *offload; 261 union { 262 struct work_struct work; 263 struct rcu_head rcu; 264 }; 265 }; 266 267 struct bpf_array { 268 struct bpf_map map; 269 u32 elem_size; 270 u32 index_mask; 271 /* 'ownership' of prog_array is claimed by the first program that 272 * is going to use this map or by the first program which FD is stored 273 * in the map to make sure that all callers and callees have the same 274 * prog_type and JITed flag 275 */ 276 enum bpf_prog_type owner_prog_type; 277 bool owner_jited; 278 union { 279 char value[0] __aligned(8); 280 void *ptrs[0] __aligned(8); 281 void __percpu *pptrs[0] __aligned(8); 282 }; 283 }; 284 285 #define MAX_TAIL_CALL_CNT 32 286 287 struct bpf_event_entry { 288 struct perf_event *event; 289 struct file *perf_file; 290 struct file *map_file; 291 struct rcu_head rcu; 292 }; 293 294 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp); 295 int bpf_prog_calc_tag(struct bpf_prog *fp); 296 297 const struct bpf_func_proto *bpf_get_trace_printk_proto(void); 298 299 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src, 300 unsigned long off, unsigned long len); 301 302 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, 303 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy); 304 305 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, 306 union bpf_attr __user *uattr); 307 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, 308 union bpf_attr __user *uattr); 309 310 /* an array of programs to be executed under rcu_lock. 311 * 312 * Typical usage: 313 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN); 314 * 315 * the structure returned by bpf_prog_array_alloc() should be populated 316 * with program pointers and the last pointer must be NULL. 317 * The user has to keep refcnt on the program and make sure the program 318 * is removed from the array before bpf_prog_put(). 319 * The 'struct bpf_prog_array *' should only be replaced with xchg() 320 * since other cpus are walking the array of pointers in parallel. 321 */ 322 struct bpf_prog_array { 323 struct rcu_head rcu; 324 struct bpf_prog *progs[0]; 325 }; 326 327 struct bpf_prog_array __rcu *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags); 328 void bpf_prog_array_free(struct bpf_prog_array __rcu *progs); 329 int bpf_prog_array_length(struct bpf_prog_array __rcu *progs); 330 int bpf_prog_array_copy_to_user(struct bpf_prog_array __rcu *progs, 331 __u32 __user *prog_ids, u32 cnt); 332 333 void bpf_prog_array_delete_safe(struct bpf_prog_array __rcu *progs, 334 struct bpf_prog *old_prog); 335 int bpf_prog_array_copy_info(struct bpf_prog_array __rcu *array, 336 __u32 __user *prog_ids, u32 request_cnt, 337 __u32 __user *prog_cnt); 338 int bpf_prog_array_copy(struct bpf_prog_array __rcu *old_array, 339 struct bpf_prog *exclude_prog, 340 struct bpf_prog *include_prog, 341 struct bpf_prog_array **new_array); 342 343 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null) \ 344 ({ \ 345 struct bpf_prog **_prog, *__prog; \ 346 struct bpf_prog_array *_array; \ 347 u32 _ret = 1; \ 348 rcu_read_lock(); \ 349 _array = rcu_dereference(array); \ 350 if (unlikely(check_non_null && !_array))\ 351 goto _out; \ 352 _prog = _array->progs; \ 353 while ((__prog = READ_ONCE(*_prog))) { \ 354 _ret &= func(__prog, ctx); \ 355 _prog++; \ 356 } \ 357 _out: \ 358 rcu_read_unlock(); \ 359 _ret; \ 360 }) 361 362 #define BPF_PROG_RUN_ARRAY(array, ctx, func) \ 363 __BPF_PROG_RUN_ARRAY(array, ctx, func, false) 364 365 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \ 366 __BPF_PROG_RUN_ARRAY(array, ctx, func, true) 367 368 #ifdef CONFIG_BPF_SYSCALL 369 DECLARE_PER_CPU(int, bpf_prog_active); 370 371 extern const struct file_operations bpf_map_fops; 372 extern const struct file_operations bpf_prog_fops; 373 374 #define BPF_PROG_TYPE(_id, _name) \ 375 extern const struct bpf_prog_ops _name ## _prog_ops; \ 376 extern const struct bpf_verifier_ops _name ## _verifier_ops; 377 #define BPF_MAP_TYPE(_id, _ops) \ 378 extern const struct bpf_map_ops _ops; 379 #include <linux/bpf_types.h> 380 #undef BPF_PROG_TYPE 381 #undef BPF_MAP_TYPE 382 383 extern const struct bpf_prog_ops bpf_offload_prog_ops; 384 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops; 385 extern const struct bpf_verifier_ops xdp_analyzer_ops; 386 387 struct bpf_prog *bpf_prog_get(u32 ufd); 388 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, 389 bool attach_drv); 390 struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, int i); 391 void bpf_prog_sub(struct bpf_prog *prog, int i); 392 struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog); 393 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog); 394 void bpf_prog_put(struct bpf_prog *prog); 395 int __bpf_prog_charge(struct user_struct *user, u32 pages); 396 void __bpf_prog_uncharge(struct user_struct *user, u32 pages); 397 398 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock); 399 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock); 400 401 struct bpf_map *bpf_map_get_with_uref(u32 ufd); 402 struct bpf_map *__bpf_map_get(struct fd f); 403 struct bpf_map * __must_check bpf_map_inc(struct bpf_map *map, bool uref); 404 void bpf_map_put_with_uref(struct bpf_map *map); 405 void bpf_map_put(struct bpf_map *map); 406 int bpf_map_precharge_memlock(u32 pages); 407 void *bpf_map_area_alloc(size_t size, int numa_node); 408 void bpf_map_area_free(void *base); 409 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr); 410 411 extern int sysctl_unprivileged_bpf_disabled; 412 413 int bpf_map_new_fd(struct bpf_map *map, int flags); 414 int bpf_prog_new_fd(struct bpf_prog *prog); 415 416 int bpf_obj_pin_user(u32 ufd, const char __user *pathname); 417 int bpf_obj_get_user(const char __user *pathname, int flags); 418 419 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value); 420 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value); 421 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value, 422 u64 flags); 423 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value, 424 u64 flags); 425 426 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value); 427 428 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file, 429 void *key, void *value, u64 map_flags); 430 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 431 void bpf_fd_array_map_clear(struct bpf_map *map); 432 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file, 433 void *key, void *value, u64 map_flags); 434 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 435 436 int bpf_get_file_flag(int flags); 437 438 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and 439 * forced to use 'long' read/writes to try to atomically copy long counters. 440 * Best-effort only. No barriers here, since it _will_ race with concurrent 441 * updates from BPF programs. Called from bpf syscall and mostly used with 442 * size 8 or 16 bytes, so ask compiler to inline it. 443 */ 444 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size) 445 { 446 const long *lsrc = src; 447 long *ldst = dst; 448 449 size /= sizeof(long); 450 while (size--) 451 *ldst++ = *lsrc++; 452 } 453 454 /* verify correctness of eBPF program */ 455 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr); 456 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth); 457 458 /* Map specifics */ 459 struct net_device *__dev_map_lookup_elem(struct bpf_map *map, u32 key); 460 void __dev_map_insert_ctx(struct bpf_map *map, u32 index); 461 void __dev_map_flush(struct bpf_map *map); 462 463 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key); 464 void __cpu_map_insert_ctx(struct bpf_map *map, u32 index); 465 void __cpu_map_flush(struct bpf_map *map); 466 struct xdp_buff; 467 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp, 468 struct net_device *dev_rx); 469 470 /* Return map's numa specified by userspace */ 471 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr) 472 { 473 return (attr->map_flags & BPF_F_NUMA_NODE) ? 474 attr->numa_node : NUMA_NO_NODE; 475 } 476 477 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type); 478 479 #else /* !CONFIG_BPF_SYSCALL */ 480 static inline struct bpf_prog *bpf_prog_get(u32 ufd) 481 { 482 return ERR_PTR(-EOPNOTSUPP); 483 } 484 485 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, 486 enum bpf_prog_type type, 487 bool attach_drv) 488 { 489 return ERR_PTR(-EOPNOTSUPP); 490 } 491 492 static inline struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, 493 int i) 494 { 495 return ERR_PTR(-EOPNOTSUPP); 496 } 497 498 static inline void bpf_prog_sub(struct bpf_prog *prog, int i) 499 { 500 } 501 502 static inline void bpf_prog_put(struct bpf_prog *prog) 503 { 504 } 505 506 static inline struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog) 507 { 508 return ERR_PTR(-EOPNOTSUPP); 509 } 510 511 static inline struct bpf_prog *__must_check 512 bpf_prog_inc_not_zero(struct bpf_prog *prog) 513 { 514 return ERR_PTR(-EOPNOTSUPP); 515 } 516 517 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages) 518 { 519 return 0; 520 } 521 522 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages) 523 { 524 } 525 526 static inline int bpf_obj_get_user(const char __user *pathname, int flags) 527 { 528 return -EOPNOTSUPP; 529 } 530 531 static inline struct net_device *__dev_map_lookup_elem(struct bpf_map *map, 532 u32 key) 533 { 534 return NULL; 535 } 536 537 static inline void __dev_map_insert_ctx(struct bpf_map *map, u32 index) 538 { 539 } 540 541 static inline void __dev_map_flush(struct bpf_map *map) 542 { 543 } 544 545 static inline 546 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key) 547 { 548 return NULL; 549 } 550 551 static inline void __cpu_map_insert_ctx(struct bpf_map *map, u32 index) 552 { 553 } 554 555 static inline void __cpu_map_flush(struct bpf_map *map) 556 { 557 } 558 559 struct xdp_buff; 560 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, 561 struct xdp_buff *xdp, 562 struct net_device *dev_rx) 563 { 564 return 0; 565 } 566 567 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name, 568 enum bpf_prog_type type) 569 { 570 return ERR_PTR(-EOPNOTSUPP); 571 } 572 #endif /* CONFIG_BPF_SYSCALL */ 573 574 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd, 575 enum bpf_prog_type type) 576 { 577 return bpf_prog_get_type_dev(ufd, type, false); 578 } 579 580 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool); 581 582 int bpf_prog_offload_compile(struct bpf_prog *prog); 583 void bpf_prog_offload_destroy(struct bpf_prog *prog); 584 int bpf_prog_offload_info_fill(struct bpf_prog_info *info, 585 struct bpf_prog *prog); 586 587 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value); 588 int bpf_map_offload_update_elem(struct bpf_map *map, 589 void *key, void *value, u64 flags); 590 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key); 591 int bpf_map_offload_get_next_key(struct bpf_map *map, 592 void *key, void *next_key); 593 594 bool bpf_offload_dev_match(struct bpf_prog *prog, struct bpf_map *map); 595 596 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL) 597 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr); 598 599 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux) 600 { 601 return aux->offload_requested; 602 } 603 604 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 605 { 606 return unlikely(map->ops == &bpf_map_offload_ops); 607 } 608 609 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr); 610 void bpf_map_offload_map_free(struct bpf_map *map); 611 #else 612 static inline int bpf_prog_offload_init(struct bpf_prog *prog, 613 union bpf_attr *attr) 614 { 615 return -EOPNOTSUPP; 616 } 617 618 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux) 619 { 620 return false; 621 } 622 623 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 624 { 625 return false; 626 } 627 628 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr) 629 { 630 return ERR_PTR(-EOPNOTSUPP); 631 } 632 633 static inline void bpf_map_offload_map_free(struct bpf_map *map) 634 { 635 } 636 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */ 637 638 #if defined(CONFIG_STREAM_PARSER) && defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_INET) 639 struct sock *__sock_map_lookup_elem(struct bpf_map *map, u32 key); 640 int sock_map_prog(struct bpf_map *map, struct bpf_prog *prog, u32 type); 641 #else 642 static inline struct sock *__sock_map_lookup_elem(struct bpf_map *map, u32 key) 643 { 644 return NULL; 645 } 646 647 static inline int sock_map_prog(struct bpf_map *map, 648 struct bpf_prog *prog, 649 u32 type) 650 { 651 return -EOPNOTSUPP; 652 } 653 #endif 654 655 /* verifier prototypes for helper functions called from eBPF programs */ 656 extern const struct bpf_func_proto bpf_map_lookup_elem_proto; 657 extern const struct bpf_func_proto bpf_map_update_elem_proto; 658 extern const struct bpf_func_proto bpf_map_delete_elem_proto; 659 660 extern const struct bpf_func_proto bpf_get_prandom_u32_proto; 661 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto; 662 extern const struct bpf_func_proto bpf_get_numa_node_id_proto; 663 extern const struct bpf_func_proto bpf_tail_call_proto; 664 extern const struct bpf_func_proto bpf_ktime_get_ns_proto; 665 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto; 666 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto; 667 extern const struct bpf_func_proto bpf_get_current_comm_proto; 668 extern const struct bpf_func_proto bpf_skb_vlan_push_proto; 669 extern const struct bpf_func_proto bpf_skb_vlan_pop_proto; 670 extern const struct bpf_func_proto bpf_get_stackid_proto; 671 extern const struct bpf_func_proto bpf_sock_map_update_proto; 672 673 /* Shared helpers among cBPF and eBPF. */ 674 void bpf_user_rnd_init_once(void); 675 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 676 677 #endif /* _LINUX_BPF_H */ 678