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_id; 73 u32 btf_value_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); 466 467 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and 468 * forced to use 'long' read/writes to try to atomically copy long counters. 469 * Best-effort only. No barriers here, since it _will_ race with concurrent 470 * updates from BPF programs. Called from bpf syscall and mostly used with 471 * size 8 or 16 bytes, so ask compiler to inline it. 472 */ 473 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size) 474 { 475 const long *lsrc = src; 476 long *ldst = dst; 477 478 size /= sizeof(long); 479 while (size--) 480 *ldst++ = *lsrc++; 481 } 482 483 /* verify correctness of eBPF program */ 484 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr); 485 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth); 486 487 /* Map specifics */ 488 struct net_device *__dev_map_lookup_elem(struct bpf_map *map, u32 key); 489 void __dev_map_insert_ctx(struct bpf_map *map, u32 index); 490 void __dev_map_flush(struct bpf_map *map); 491 492 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key); 493 void __cpu_map_insert_ctx(struct bpf_map *map, u32 index); 494 void __cpu_map_flush(struct bpf_map *map); 495 struct xdp_buff; 496 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp, 497 struct net_device *dev_rx); 498 499 /* Return map's numa specified by userspace */ 500 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr) 501 { 502 return (attr->map_flags & BPF_F_NUMA_NODE) ? 503 attr->numa_node : NUMA_NO_NODE; 504 } 505 506 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type); 507 508 #else /* !CONFIG_BPF_SYSCALL */ 509 static inline struct bpf_prog *bpf_prog_get(u32 ufd) 510 { 511 return ERR_PTR(-EOPNOTSUPP); 512 } 513 514 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, 515 enum bpf_prog_type type, 516 bool attach_drv) 517 { 518 return ERR_PTR(-EOPNOTSUPP); 519 } 520 521 static inline struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, 522 int i) 523 { 524 return ERR_PTR(-EOPNOTSUPP); 525 } 526 527 static inline void bpf_prog_sub(struct bpf_prog *prog, int i) 528 { 529 } 530 531 static inline void bpf_prog_put(struct bpf_prog *prog) 532 { 533 } 534 535 static inline struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog) 536 { 537 return ERR_PTR(-EOPNOTSUPP); 538 } 539 540 static inline struct bpf_prog *__must_check 541 bpf_prog_inc_not_zero(struct bpf_prog *prog) 542 { 543 return ERR_PTR(-EOPNOTSUPP); 544 } 545 546 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages) 547 { 548 return 0; 549 } 550 551 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages) 552 { 553 } 554 555 static inline int bpf_obj_get_user(const char __user *pathname, int flags) 556 { 557 return -EOPNOTSUPP; 558 } 559 560 static inline struct net_device *__dev_map_lookup_elem(struct bpf_map *map, 561 u32 key) 562 { 563 return NULL; 564 } 565 566 static inline void __dev_map_insert_ctx(struct bpf_map *map, u32 index) 567 { 568 } 569 570 static inline void __dev_map_flush(struct bpf_map *map) 571 { 572 } 573 574 static inline 575 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key) 576 { 577 return NULL; 578 } 579 580 static inline void __cpu_map_insert_ctx(struct bpf_map *map, u32 index) 581 { 582 } 583 584 static inline void __cpu_map_flush(struct bpf_map *map) 585 { 586 } 587 588 struct xdp_buff; 589 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, 590 struct xdp_buff *xdp, 591 struct net_device *dev_rx) 592 { 593 return 0; 594 } 595 596 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name, 597 enum bpf_prog_type type) 598 { 599 return ERR_PTR(-EOPNOTSUPP); 600 } 601 #endif /* CONFIG_BPF_SYSCALL */ 602 603 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd, 604 enum bpf_prog_type type) 605 { 606 return bpf_prog_get_type_dev(ufd, type, false); 607 } 608 609 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool); 610 611 int bpf_prog_offload_compile(struct bpf_prog *prog); 612 void bpf_prog_offload_destroy(struct bpf_prog *prog); 613 int bpf_prog_offload_info_fill(struct bpf_prog_info *info, 614 struct bpf_prog *prog); 615 616 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map); 617 618 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value); 619 int bpf_map_offload_update_elem(struct bpf_map *map, 620 void *key, void *value, u64 flags); 621 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key); 622 int bpf_map_offload_get_next_key(struct bpf_map *map, 623 void *key, void *next_key); 624 625 bool bpf_offload_dev_match(struct bpf_prog *prog, struct bpf_map *map); 626 627 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL) 628 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr); 629 630 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux) 631 { 632 return aux->offload_requested; 633 } 634 635 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 636 { 637 return unlikely(map->ops == &bpf_map_offload_ops); 638 } 639 640 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr); 641 void bpf_map_offload_map_free(struct bpf_map *map); 642 #else 643 static inline int bpf_prog_offload_init(struct bpf_prog *prog, 644 union bpf_attr *attr) 645 { 646 return -EOPNOTSUPP; 647 } 648 649 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux) 650 { 651 return false; 652 } 653 654 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 655 { 656 return false; 657 } 658 659 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr) 660 { 661 return ERR_PTR(-EOPNOTSUPP); 662 } 663 664 static inline void bpf_map_offload_map_free(struct bpf_map *map) 665 { 666 } 667 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */ 668 669 #if defined(CONFIG_STREAM_PARSER) && defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_INET) 670 struct sock *__sock_map_lookup_elem(struct bpf_map *map, u32 key); 671 int sock_map_prog(struct bpf_map *map, struct bpf_prog *prog, u32 type); 672 #else 673 static inline struct sock *__sock_map_lookup_elem(struct bpf_map *map, u32 key) 674 { 675 return NULL; 676 } 677 678 static inline int sock_map_prog(struct bpf_map *map, 679 struct bpf_prog *prog, 680 u32 type) 681 { 682 return -EOPNOTSUPP; 683 } 684 #endif 685 686 #if defined(CONFIG_XDP_SOCKETS) 687 struct xdp_sock; 688 struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, u32 key); 689 int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp, 690 struct xdp_sock *xs); 691 void __xsk_map_flush(struct bpf_map *map); 692 #else 693 struct xdp_sock; 694 static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, 695 u32 key) 696 { 697 return NULL; 698 } 699 700 static inline int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp, 701 struct xdp_sock *xs) 702 { 703 return -EOPNOTSUPP; 704 } 705 706 static inline void __xsk_map_flush(struct bpf_map *map) 707 { 708 } 709 #endif 710 711 /* verifier prototypes for helper functions called from eBPF programs */ 712 extern const struct bpf_func_proto bpf_map_lookup_elem_proto; 713 extern const struct bpf_func_proto bpf_map_update_elem_proto; 714 extern const struct bpf_func_proto bpf_map_delete_elem_proto; 715 716 extern const struct bpf_func_proto bpf_get_prandom_u32_proto; 717 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto; 718 extern const struct bpf_func_proto bpf_get_numa_node_id_proto; 719 extern const struct bpf_func_proto bpf_tail_call_proto; 720 extern const struct bpf_func_proto bpf_ktime_get_ns_proto; 721 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto; 722 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto; 723 extern const struct bpf_func_proto bpf_get_current_comm_proto; 724 extern const struct bpf_func_proto bpf_get_stackid_proto; 725 extern const struct bpf_func_proto bpf_get_stack_proto; 726 extern const struct bpf_func_proto bpf_sock_map_update_proto; 727 728 /* Shared helpers among cBPF and eBPF. */ 729 void bpf_user_rnd_init_once(void); 730 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 731 732 #endif /* _LINUX_BPF_H */ 733