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 26 /* map is generic key/value storage optionally accesible by eBPF programs */ 27 struct bpf_map_ops { 28 /* funcs callable from userspace (via syscall) */ 29 int (*map_alloc_check)(union bpf_attr *attr); 30 struct bpf_map *(*map_alloc)(union bpf_attr *attr); 31 void (*map_release)(struct bpf_map *map, struct file *map_file); 32 void (*map_free)(struct bpf_map *map); 33 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key); 34 35 /* funcs callable from userspace and from eBPF programs */ 36 void *(*map_lookup_elem)(struct bpf_map *map, void *key); 37 int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags); 38 int (*map_delete_elem)(struct bpf_map *map, void *key); 39 40 /* funcs called by prog_array and perf_event_array map */ 41 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file, 42 int fd); 43 void (*map_fd_put_ptr)(void *ptr); 44 u32 (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf); 45 u32 (*map_fd_sys_lookup_elem)(void *ptr); 46 }; 47 48 struct bpf_map { 49 /* 1st cacheline with read-mostly members of which some 50 * are also accessed in fast-path (e.g. ops, max_entries). 51 */ 52 const struct bpf_map_ops *ops ____cacheline_aligned; 53 struct bpf_map *inner_map_meta; 54 #ifdef CONFIG_SECURITY 55 void *security; 56 #endif 57 enum bpf_map_type map_type; 58 u32 key_size; 59 u32 value_size; 60 u32 max_entries; 61 u32 map_flags; 62 u32 pages; 63 u32 id; 64 int numa_node; 65 bool unpriv_array; 66 /* 7 bytes hole */ 67 68 /* 2nd cacheline with misc members to avoid false sharing 69 * particularly with refcounting. 70 */ 71 struct user_struct *user ____cacheline_aligned; 72 atomic_t refcnt; 73 atomic_t usercnt; 74 struct work_struct work; 75 char name[BPF_OBJ_NAME_LEN]; 76 }; 77 78 struct bpf_offloaded_map; 79 80 struct bpf_map_dev_ops { 81 int (*map_get_next_key)(struct bpf_offloaded_map *map, 82 void *key, void *next_key); 83 int (*map_lookup_elem)(struct bpf_offloaded_map *map, 84 void *key, void *value); 85 int (*map_update_elem)(struct bpf_offloaded_map *map, 86 void *key, void *value, u64 flags); 87 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key); 88 }; 89 90 struct bpf_offloaded_map { 91 struct bpf_map map; 92 struct net_device *netdev; 93 const struct bpf_map_dev_ops *dev_ops; 94 void *dev_priv; 95 struct list_head offloads; 96 }; 97 98 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map) 99 { 100 return container_of(map, struct bpf_offloaded_map, map); 101 } 102 103 extern const struct bpf_map_ops bpf_map_offload_ops; 104 105 /* function argument constraints */ 106 enum bpf_arg_type { 107 ARG_DONTCARE = 0, /* unused argument in helper function */ 108 109 /* the following constraints used to prototype 110 * bpf_map_lookup/update/delete_elem() functions 111 */ 112 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */ 113 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */ 114 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */ 115 116 /* the following constraints used to prototype bpf_memcmp() and other 117 * functions that access data on eBPF program stack 118 */ 119 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */ 120 ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */ 121 ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized, 122 * helper function must fill all bytes or clear 123 * them in error case. 124 */ 125 126 ARG_CONST_SIZE, /* number of bytes accessed from memory */ 127 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */ 128 129 ARG_PTR_TO_CTX, /* pointer to context */ 130 ARG_ANYTHING, /* any (initialized) argument is ok */ 131 }; 132 133 /* type of values returned from helper functions */ 134 enum bpf_return_type { 135 RET_INTEGER, /* function returns integer */ 136 RET_VOID, /* function doesn't return anything */ 137 RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */ 138 }; 139 140 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs 141 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL 142 * instructions after verifying 143 */ 144 struct bpf_func_proto { 145 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 146 bool gpl_only; 147 bool pkt_access; 148 enum bpf_return_type ret_type; 149 enum bpf_arg_type arg1_type; 150 enum bpf_arg_type arg2_type; 151 enum bpf_arg_type arg3_type; 152 enum bpf_arg_type arg4_type; 153 enum bpf_arg_type arg5_type; 154 }; 155 156 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is 157 * the first argument to eBPF programs. 158 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *' 159 */ 160 struct bpf_context; 161 162 enum bpf_access_type { 163 BPF_READ = 1, 164 BPF_WRITE = 2 165 }; 166 167 /* types of values stored in eBPF registers */ 168 /* Pointer types represent: 169 * pointer 170 * pointer + imm 171 * pointer + (u16) var 172 * pointer + (u16) var + imm 173 * if (range > 0) then [ptr, ptr + range - off) is safe to access 174 * if (id > 0) means that some 'var' was added 175 * if (off > 0) means that 'imm' was added 176 */ 177 enum bpf_reg_type { 178 NOT_INIT = 0, /* nothing was written into register */ 179 SCALAR_VALUE, /* reg doesn't contain a valid pointer */ 180 PTR_TO_CTX, /* reg points to bpf_context */ 181 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */ 182 PTR_TO_MAP_VALUE, /* reg points to map element value */ 183 PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */ 184 PTR_TO_STACK, /* reg == frame_pointer + offset */ 185 PTR_TO_PACKET_META, /* skb->data - meta_len */ 186 PTR_TO_PACKET, /* reg points to skb->data */ 187 PTR_TO_PACKET_END, /* skb->data + headlen */ 188 }; 189 190 /* The information passed from prog-specific *_is_valid_access 191 * back to the verifier. 192 */ 193 struct bpf_insn_access_aux { 194 enum bpf_reg_type reg_type; 195 int ctx_field_size; 196 }; 197 198 static inline void 199 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size) 200 { 201 aux->ctx_field_size = size; 202 } 203 204 struct bpf_prog_ops { 205 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr, 206 union bpf_attr __user *uattr); 207 }; 208 209 struct bpf_verifier_ops { 210 /* return eBPF function prototype for verification */ 211 const struct bpf_func_proto * 212 (*get_func_proto)(enum bpf_func_id func_id, 213 const struct bpf_prog *prog); 214 215 /* return true if 'size' wide access at offset 'off' within bpf_context 216 * with 'type' (read or write) is allowed 217 */ 218 bool (*is_valid_access)(int off, int size, enum bpf_access_type type, 219 const struct bpf_prog *prog, 220 struct bpf_insn_access_aux *info); 221 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write, 222 const struct bpf_prog *prog); 223 u32 (*convert_ctx_access)(enum bpf_access_type type, 224 const struct bpf_insn *src, 225 struct bpf_insn *dst, 226 struct bpf_prog *prog, u32 *target_size); 227 }; 228 229 struct bpf_prog_offload_ops { 230 int (*insn_hook)(struct bpf_verifier_env *env, 231 int insn_idx, int prev_insn_idx); 232 }; 233 234 struct bpf_prog_offload { 235 struct bpf_prog *prog; 236 struct net_device *netdev; 237 void *dev_priv; 238 struct list_head offloads; 239 bool dev_state; 240 const struct bpf_prog_offload_ops *dev_ops; 241 void *jited_image; 242 u32 jited_len; 243 }; 244 245 struct bpf_prog_aux { 246 atomic_t refcnt; 247 u32 used_map_cnt; 248 u32 max_ctx_offset; 249 u32 stack_depth; 250 u32 id; 251 u32 func_cnt; 252 bool offload_requested; 253 struct bpf_prog **func; 254 void *jit_data; /* JIT specific data. arch dependent */ 255 struct latch_tree_node ksym_tnode; 256 struct list_head ksym_lnode; 257 const struct bpf_prog_ops *ops; 258 struct bpf_map **used_maps; 259 struct bpf_prog *prog; 260 struct user_struct *user; 261 u64 load_time; /* ns since boottime */ 262 char name[BPF_OBJ_NAME_LEN]; 263 #ifdef CONFIG_SECURITY 264 void *security; 265 #endif 266 struct bpf_prog_offload *offload; 267 union { 268 struct work_struct work; 269 struct rcu_head rcu; 270 }; 271 }; 272 273 struct bpf_array { 274 struct bpf_map map; 275 u32 elem_size; 276 u32 index_mask; 277 /* 'ownership' of prog_array is claimed by the first program that 278 * is going to use this map or by the first program which FD is stored 279 * in the map to make sure that all callers and callees have the same 280 * prog_type and JITed flag 281 */ 282 enum bpf_prog_type owner_prog_type; 283 bool owner_jited; 284 union { 285 char value[0] __aligned(8); 286 void *ptrs[0] __aligned(8); 287 void __percpu *pptrs[0] __aligned(8); 288 }; 289 }; 290 291 #define MAX_TAIL_CALL_CNT 32 292 293 struct bpf_event_entry { 294 struct perf_event *event; 295 struct file *perf_file; 296 struct file *map_file; 297 struct rcu_head rcu; 298 }; 299 300 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp); 301 int bpf_prog_calc_tag(struct bpf_prog *fp); 302 303 const struct bpf_func_proto *bpf_get_trace_printk_proto(void); 304 305 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src, 306 unsigned long off, unsigned long len); 307 308 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, 309 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy); 310 311 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, 312 union bpf_attr __user *uattr); 313 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, 314 union bpf_attr __user *uattr); 315 316 /* an array of programs to be executed under rcu_lock. 317 * 318 * Typical usage: 319 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN); 320 * 321 * the structure returned by bpf_prog_array_alloc() should be populated 322 * with program pointers and the last pointer must be NULL. 323 * The user has to keep refcnt on the program and make sure the program 324 * is removed from the array before bpf_prog_put(). 325 * The 'struct bpf_prog_array *' should only be replaced with xchg() 326 * since other cpus are walking the array of pointers in parallel. 327 */ 328 struct bpf_prog_array { 329 struct rcu_head rcu; 330 struct bpf_prog *progs[0]; 331 }; 332 333 struct bpf_prog_array __rcu *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags); 334 void bpf_prog_array_free(struct bpf_prog_array __rcu *progs); 335 int bpf_prog_array_length(struct bpf_prog_array __rcu *progs); 336 int bpf_prog_array_copy_to_user(struct bpf_prog_array __rcu *progs, 337 __u32 __user *prog_ids, u32 cnt); 338 339 void bpf_prog_array_delete_safe(struct bpf_prog_array __rcu *progs, 340 struct bpf_prog *old_prog); 341 int bpf_prog_array_copy_info(struct bpf_prog_array __rcu *array, 342 __u32 __user *prog_ids, u32 request_cnt, 343 __u32 __user *prog_cnt); 344 int bpf_prog_array_copy(struct bpf_prog_array __rcu *old_array, 345 struct bpf_prog *exclude_prog, 346 struct bpf_prog *include_prog, 347 struct bpf_prog_array **new_array); 348 349 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null) \ 350 ({ \ 351 struct bpf_prog **_prog, *__prog; \ 352 struct bpf_prog_array *_array; \ 353 u32 _ret = 1; \ 354 rcu_read_lock(); \ 355 _array = rcu_dereference(array); \ 356 if (unlikely(check_non_null && !_array))\ 357 goto _out; \ 358 _prog = _array->progs; \ 359 while ((__prog = READ_ONCE(*_prog))) { \ 360 _ret &= func(__prog, ctx); \ 361 _prog++; \ 362 } \ 363 _out: \ 364 rcu_read_unlock(); \ 365 _ret; \ 366 }) 367 368 #define BPF_PROG_RUN_ARRAY(array, ctx, func) \ 369 __BPF_PROG_RUN_ARRAY(array, ctx, func, false) 370 371 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \ 372 __BPF_PROG_RUN_ARRAY(array, ctx, func, true) 373 374 #ifdef CONFIG_BPF_SYSCALL 375 DECLARE_PER_CPU(int, bpf_prog_active); 376 377 extern const struct file_operations bpf_map_fops; 378 extern const struct file_operations bpf_prog_fops; 379 380 #define BPF_PROG_TYPE(_id, _name) \ 381 extern const struct bpf_prog_ops _name ## _prog_ops; \ 382 extern const struct bpf_verifier_ops _name ## _verifier_ops; 383 #define BPF_MAP_TYPE(_id, _ops) \ 384 extern const struct bpf_map_ops _ops; 385 #include <linux/bpf_types.h> 386 #undef BPF_PROG_TYPE 387 #undef BPF_MAP_TYPE 388 389 extern const struct bpf_prog_ops bpf_offload_prog_ops; 390 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops; 391 extern const struct bpf_verifier_ops xdp_analyzer_ops; 392 393 struct bpf_prog *bpf_prog_get(u32 ufd); 394 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, 395 bool attach_drv); 396 struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, int i); 397 void bpf_prog_sub(struct bpf_prog *prog, int i); 398 struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog); 399 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog); 400 void bpf_prog_put(struct bpf_prog *prog); 401 int __bpf_prog_charge(struct user_struct *user, u32 pages); 402 void __bpf_prog_uncharge(struct user_struct *user, u32 pages); 403 404 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock); 405 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock); 406 407 struct bpf_map *bpf_map_get_with_uref(u32 ufd); 408 struct bpf_map *__bpf_map_get(struct fd f); 409 struct bpf_map * __must_check bpf_map_inc(struct bpf_map *map, bool uref); 410 void bpf_map_put_with_uref(struct bpf_map *map); 411 void bpf_map_put(struct bpf_map *map); 412 int bpf_map_precharge_memlock(u32 pages); 413 void *bpf_map_area_alloc(size_t size, int numa_node); 414 void bpf_map_area_free(void *base); 415 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr); 416 417 extern int sysctl_unprivileged_bpf_disabled; 418 419 int bpf_map_new_fd(struct bpf_map *map, int flags); 420 int bpf_prog_new_fd(struct bpf_prog *prog); 421 422 int bpf_obj_pin_user(u32 ufd, const char __user *pathname); 423 int bpf_obj_get_user(const char __user *pathname, int flags); 424 425 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value); 426 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value); 427 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value, 428 u64 flags); 429 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value, 430 u64 flags); 431 432 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value); 433 434 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file, 435 void *key, void *value, u64 map_flags); 436 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 437 void bpf_fd_array_map_clear(struct bpf_map *map); 438 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file, 439 void *key, void *value, u64 map_flags); 440 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 441 442 int bpf_get_file_flag(int flags); 443 444 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and 445 * forced to use 'long' read/writes to try to atomically copy long counters. 446 * Best-effort only. No barriers here, since it _will_ race with concurrent 447 * updates from BPF programs. Called from bpf syscall and mostly used with 448 * size 8 or 16 bytes, so ask compiler to inline it. 449 */ 450 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size) 451 { 452 const long *lsrc = src; 453 long *ldst = dst; 454 455 size /= sizeof(long); 456 while (size--) 457 *ldst++ = *lsrc++; 458 } 459 460 /* verify correctness of eBPF program */ 461 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr); 462 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth); 463 464 /* Map specifics */ 465 struct net_device *__dev_map_lookup_elem(struct bpf_map *map, u32 key); 466 void __dev_map_insert_ctx(struct bpf_map *map, u32 index); 467 void __dev_map_flush(struct bpf_map *map); 468 469 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key); 470 void __cpu_map_insert_ctx(struct bpf_map *map, u32 index); 471 void __cpu_map_flush(struct bpf_map *map); 472 struct xdp_buff; 473 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp, 474 struct net_device *dev_rx); 475 476 /* Return map's numa specified by userspace */ 477 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr) 478 { 479 return (attr->map_flags & BPF_F_NUMA_NODE) ? 480 attr->numa_node : NUMA_NO_NODE; 481 } 482 483 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type); 484 485 #else /* !CONFIG_BPF_SYSCALL */ 486 static inline struct bpf_prog *bpf_prog_get(u32 ufd) 487 { 488 return ERR_PTR(-EOPNOTSUPP); 489 } 490 491 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, 492 enum bpf_prog_type type, 493 bool attach_drv) 494 { 495 return ERR_PTR(-EOPNOTSUPP); 496 } 497 498 static inline struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, 499 int i) 500 { 501 return ERR_PTR(-EOPNOTSUPP); 502 } 503 504 static inline void bpf_prog_sub(struct bpf_prog *prog, int i) 505 { 506 } 507 508 static inline void bpf_prog_put(struct bpf_prog *prog) 509 { 510 } 511 512 static inline struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog) 513 { 514 return ERR_PTR(-EOPNOTSUPP); 515 } 516 517 static inline struct bpf_prog *__must_check 518 bpf_prog_inc_not_zero(struct bpf_prog *prog) 519 { 520 return ERR_PTR(-EOPNOTSUPP); 521 } 522 523 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages) 524 { 525 return 0; 526 } 527 528 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages) 529 { 530 } 531 532 static inline int bpf_obj_get_user(const char __user *pathname, int flags) 533 { 534 return -EOPNOTSUPP; 535 } 536 537 static inline struct net_device *__dev_map_lookup_elem(struct bpf_map *map, 538 u32 key) 539 { 540 return NULL; 541 } 542 543 static inline void __dev_map_insert_ctx(struct bpf_map *map, u32 index) 544 { 545 } 546 547 static inline void __dev_map_flush(struct bpf_map *map) 548 { 549 } 550 551 static inline 552 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key) 553 { 554 return NULL; 555 } 556 557 static inline void __cpu_map_insert_ctx(struct bpf_map *map, u32 index) 558 { 559 } 560 561 static inline void __cpu_map_flush(struct bpf_map *map) 562 { 563 } 564 565 struct xdp_buff; 566 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, 567 struct xdp_buff *xdp, 568 struct net_device *dev_rx) 569 { 570 return 0; 571 } 572 573 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name, 574 enum bpf_prog_type type) 575 { 576 return ERR_PTR(-EOPNOTSUPP); 577 } 578 #endif /* CONFIG_BPF_SYSCALL */ 579 580 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd, 581 enum bpf_prog_type type) 582 { 583 return bpf_prog_get_type_dev(ufd, type, false); 584 } 585 586 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool); 587 588 int bpf_prog_offload_compile(struct bpf_prog *prog); 589 void bpf_prog_offload_destroy(struct bpf_prog *prog); 590 int bpf_prog_offload_info_fill(struct bpf_prog_info *info, 591 struct bpf_prog *prog); 592 593 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map); 594 595 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value); 596 int bpf_map_offload_update_elem(struct bpf_map *map, 597 void *key, void *value, u64 flags); 598 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key); 599 int bpf_map_offload_get_next_key(struct bpf_map *map, 600 void *key, void *next_key); 601 602 bool bpf_offload_dev_match(struct bpf_prog *prog, struct bpf_map *map); 603 604 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL) 605 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr); 606 607 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux) 608 { 609 return aux->offload_requested; 610 } 611 612 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 613 { 614 return unlikely(map->ops == &bpf_map_offload_ops); 615 } 616 617 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr); 618 void bpf_map_offload_map_free(struct bpf_map *map); 619 #else 620 static inline int bpf_prog_offload_init(struct bpf_prog *prog, 621 union bpf_attr *attr) 622 { 623 return -EOPNOTSUPP; 624 } 625 626 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux) 627 { 628 return false; 629 } 630 631 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 632 { 633 return false; 634 } 635 636 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr) 637 { 638 return ERR_PTR(-EOPNOTSUPP); 639 } 640 641 static inline void bpf_map_offload_map_free(struct bpf_map *map) 642 { 643 } 644 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */ 645 646 #if defined(CONFIG_STREAM_PARSER) && defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_INET) 647 struct sock *__sock_map_lookup_elem(struct bpf_map *map, u32 key); 648 int sock_map_prog(struct bpf_map *map, struct bpf_prog *prog, u32 type); 649 #else 650 static inline struct sock *__sock_map_lookup_elem(struct bpf_map *map, u32 key) 651 { 652 return NULL; 653 } 654 655 static inline int sock_map_prog(struct bpf_map *map, 656 struct bpf_prog *prog, 657 u32 type) 658 { 659 return -EOPNOTSUPP; 660 } 661 #endif 662 663 /* verifier prototypes for helper functions called from eBPF programs */ 664 extern const struct bpf_func_proto bpf_map_lookup_elem_proto; 665 extern const struct bpf_func_proto bpf_map_update_elem_proto; 666 extern const struct bpf_func_proto bpf_map_delete_elem_proto; 667 668 extern const struct bpf_func_proto bpf_get_prandom_u32_proto; 669 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto; 670 extern const struct bpf_func_proto bpf_get_numa_node_id_proto; 671 extern const struct bpf_func_proto bpf_tail_call_proto; 672 extern const struct bpf_func_proto bpf_ktime_get_ns_proto; 673 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto; 674 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto; 675 extern const struct bpf_func_proto bpf_get_current_comm_proto; 676 extern const struct bpf_func_proto bpf_skb_vlan_push_proto; 677 extern const struct bpf_func_proto bpf_skb_vlan_pop_proto; 678 extern const struct bpf_func_proto bpf_get_stackid_proto; 679 extern const struct bpf_func_proto bpf_sock_map_update_proto; 680 681 /* Shared helpers among cBPF and eBPF. */ 682 void bpf_user_rnd_init_once(void); 683 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 684 685 #endif /* _LINUX_BPF_H */ 686