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 struct btf_type; 28 29 /* map is generic key/value storage optionally accesible by eBPF programs */ 30 struct bpf_map_ops { 31 /* funcs callable from userspace (via syscall) */ 32 int (*map_alloc_check)(union bpf_attr *attr); 33 struct bpf_map *(*map_alloc)(union bpf_attr *attr); 34 void (*map_release)(struct bpf_map *map, struct file *map_file); 35 void (*map_free)(struct bpf_map *map); 36 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key); 37 void (*map_release_uref)(struct bpf_map *map); 38 39 /* funcs callable from userspace and from eBPF programs */ 40 void *(*map_lookup_elem)(struct bpf_map *map, void *key); 41 int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags); 42 int (*map_delete_elem)(struct bpf_map *map, void *key); 43 int (*map_push_elem)(struct bpf_map *map, void *value, u64 flags); 44 int (*map_pop_elem)(struct bpf_map *map, void *value); 45 int (*map_peek_elem)(struct bpf_map *map, void *value); 46 47 /* funcs called by prog_array and perf_event_array map */ 48 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file, 49 int fd); 50 void (*map_fd_put_ptr)(void *ptr); 51 u32 (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf); 52 u32 (*map_fd_sys_lookup_elem)(void *ptr); 53 void (*map_seq_show_elem)(struct bpf_map *map, void *key, 54 struct seq_file *m); 55 int (*map_check_btf)(const struct bpf_map *map, 56 const struct btf *btf, 57 const struct btf_type *key_type, 58 const struct btf_type *value_type); 59 }; 60 61 struct bpf_map { 62 /* The first two cachelines with read-mostly members of which some 63 * are also accessed in fast-path (e.g. ops, max_entries). 64 */ 65 const struct bpf_map_ops *ops ____cacheline_aligned; 66 struct bpf_map *inner_map_meta; 67 #ifdef CONFIG_SECURITY 68 void *security; 69 #endif 70 enum bpf_map_type map_type; 71 u32 key_size; 72 u32 value_size; 73 u32 max_entries; 74 u32 map_flags; 75 int spin_lock_off; /* >=0 valid offset, <0 error */ 76 u32 id; 77 int numa_node; 78 u32 btf_key_type_id; 79 u32 btf_value_type_id; 80 struct btf *btf; 81 u32 pages; 82 bool unpriv_array; 83 /* 51 bytes hole */ 84 85 /* The 3rd and 4th cacheline with misc members to avoid false sharing 86 * particularly with refcounting. 87 */ 88 struct user_struct *user ____cacheline_aligned; 89 atomic_t refcnt; 90 atomic_t usercnt; 91 struct work_struct work; 92 char name[BPF_OBJ_NAME_LEN]; 93 }; 94 95 static inline bool map_value_has_spin_lock(const struct bpf_map *map) 96 { 97 return map->spin_lock_off >= 0; 98 } 99 100 static inline void check_and_init_map_lock(struct bpf_map *map, void *dst) 101 { 102 if (likely(!map_value_has_spin_lock(map))) 103 return; 104 *(struct bpf_spin_lock *)(dst + map->spin_lock_off) = 105 (struct bpf_spin_lock){}; 106 } 107 108 /* copy everything but bpf_spin_lock */ 109 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src) 110 { 111 if (unlikely(map_value_has_spin_lock(map))) { 112 u32 off = map->spin_lock_off; 113 114 memcpy(dst, src, off); 115 memcpy(dst + off + sizeof(struct bpf_spin_lock), 116 src + off + sizeof(struct bpf_spin_lock), 117 map->value_size - off - sizeof(struct bpf_spin_lock)); 118 } else { 119 memcpy(dst, src, map->value_size); 120 } 121 } 122 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src, 123 bool lock_src); 124 125 struct bpf_offload_dev; 126 struct bpf_offloaded_map; 127 128 struct bpf_map_dev_ops { 129 int (*map_get_next_key)(struct bpf_offloaded_map *map, 130 void *key, void *next_key); 131 int (*map_lookup_elem)(struct bpf_offloaded_map *map, 132 void *key, void *value); 133 int (*map_update_elem)(struct bpf_offloaded_map *map, 134 void *key, void *value, u64 flags); 135 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key); 136 }; 137 138 struct bpf_offloaded_map { 139 struct bpf_map map; 140 struct net_device *netdev; 141 const struct bpf_map_dev_ops *dev_ops; 142 void *dev_priv; 143 struct list_head offloads; 144 }; 145 146 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map) 147 { 148 return container_of(map, struct bpf_offloaded_map, map); 149 } 150 151 static inline bool bpf_map_offload_neutral(const struct bpf_map *map) 152 { 153 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY; 154 } 155 156 static inline bool bpf_map_support_seq_show(const struct bpf_map *map) 157 { 158 return map->btf && map->ops->map_seq_show_elem; 159 } 160 161 int map_check_no_btf(const struct bpf_map *map, 162 const struct btf *btf, 163 const struct btf_type *key_type, 164 const struct btf_type *value_type); 165 166 extern const struct bpf_map_ops bpf_map_offload_ops; 167 168 /* function argument constraints */ 169 enum bpf_arg_type { 170 ARG_DONTCARE = 0, /* unused argument in helper function */ 171 172 /* the following constraints used to prototype 173 * bpf_map_lookup/update/delete_elem() functions 174 */ 175 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */ 176 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */ 177 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */ 178 ARG_PTR_TO_UNINIT_MAP_VALUE, /* pointer to valid memory used to store a map value */ 179 180 /* the following constraints used to prototype bpf_memcmp() and other 181 * functions that access data on eBPF program stack 182 */ 183 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */ 184 ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */ 185 ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized, 186 * helper function must fill all bytes or clear 187 * them in error case. 188 */ 189 190 ARG_CONST_SIZE, /* number of bytes accessed from memory */ 191 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */ 192 193 ARG_PTR_TO_CTX, /* pointer to context */ 194 ARG_ANYTHING, /* any (initialized) argument is ok */ 195 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock */ 196 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */ 197 }; 198 199 /* type of values returned from helper functions */ 200 enum bpf_return_type { 201 RET_INTEGER, /* function returns integer */ 202 RET_VOID, /* function doesn't return anything */ 203 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */ 204 RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */ 205 RET_PTR_TO_SOCKET_OR_NULL, /* returns a pointer to a socket or NULL */ 206 }; 207 208 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs 209 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL 210 * instructions after verifying 211 */ 212 struct bpf_func_proto { 213 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 214 bool gpl_only; 215 bool pkt_access; 216 enum bpf_return_type ret_type; 217 enum bpf_arg_type arg1_type; 218 enum bpf_arg_type arg2_type; 219 enum bpf_arg_type arg3_type; 220 enum bpf_arg_type arg4_type; 221 enum bpf_arg_type arg5_type; 222 }; 223 224 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is 225 * the first argument to eBPF programs. 226 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *' 227 */ 228 struct bpf_context; 229 230 enum bpf_access_type { 231 BPF_READ = 1, 232 BPF_WRITE = 2 233 }; 234 235 /* types of values stored in eBPF registers */ 236 /* Pointer types represent: 237 * pointer 238 * pointer + imm 239 * pointer + (u16) var 240 * pointer + (u16) var + imm 241 * if (range > 0) then [ptr, ptr + range - off) is safe to access 242 * if (id > 0) means that some 'var' was added 243 * if (off > 0) means that 'imm' was added 244 */ 245 enum bpf_reg_type { 246 NOT_INIT = 0, /* nothing was written into register */ 247 SCALAR_VALUE, /* reg doesn't contain a valid pointer */ 248 PTR_TO_CTX, /* reg points to bpf_context */ 249 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */ 250 PTR_TO_MAP_VALUE, /* reg points to map element value */ 251 PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */ 252 PTR_TO_STACK, /* reg == frame_pointer + offset */ 253 PTR_TO_PACKET_META, /* skb->data - meta_len */ 254 PTR_TO_PACKET, /* reg points to skb->data */ 255 PTR_TO_PACKET_END, /* skb->data + headlen */ 256 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */ 257 PTR_TO_SOCKET, /* reg points to struct bpf_sock */ 258 PTR_TO_SOCKET_OR_NULL, /* reg points to struct bpf_sock or NULL */ 259 }; 260 261 /* The information passed from prog-specific *_is_valid_access 262 * back to the verifier. 263 */ 264 struct bpf_insn_access_aux { 265 enum bpf_reg_type reg_type; 266 int ctx_field_size; 267 }; 268 269 static inline void 270 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size) 271 { 272 aux->ctx_field_size = size; 273 } 274 275 struct bpf_prog_ops { 276 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr, 277 union bpf_attr __user *uattr); 278 }; 279 280 struct bpf_verifier_ops { 281 /* return eBPF function prototype for verification */ 282 const struct bpf_func_proto * 283 (*get_func_proto)(enum bpf_func_id func_id, 284 const struct bpf_prog *prog); 285 286 /* return true if 'size' wide access at offset 'off' within bpf_context 287 * with 'type' (read or write) is allowed 288 */ 289 bool (*is_valid_access)(int off, int size, enum bpf_access_type type, 290 const struct bpf_prog *prog, 291 struct bpf_insn_access_aux *info); 292 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write, 293 const struct bpf_prog *prog); 294 int (*gen_ld_abs)(const struct bpf_insn *orig, 295 struct bpf_insn *insn_buf); 296 u32 (*convert_ctx_access)(enum bpf_access_type type, 297 const struct bpf_insn *src, 298 struct bpf_insn *dst, 299 struct bpf_prog *prog, u32 *target_size); 300 }; 301 302 struct bpf_prog_offload_ops { 303 /* verifier basic callbacks */ 304 int (*insn_hook)(struct bpf_verifier_env *env, 305 int insn_idx, int prev_insn_idx); 306 int (*finalize)(struct bpf_verifier_env *env); 307 /* verifier optimization callbacks (called after .finalize) */ 308 int (*replace_insn)(struct bpf_verifier_env *env, u32 off, 309 struct bpf_insn *insn); 310 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt); 311 /* program management callbacks */ 312 int (*prepare)(struct bpf_prog *prog); 313 int (*translate)(struct bpf_prog *prog); 314 void (*destroy)(struct bpf_prog *prog); 315 }; 316 317 struct bpf_prog_offload { 318 struct bpf_prog *prog; 319 struct net_device *netdev; 320 struct bpf_offload_dev *offdev; 321 void *dev_priv; 322 struct list_head offloads; 323 bool dev_state; 324 bool opt_failed; 325 void *jited_image; 326 u32 jited_len; 327 }; 328 329 enum bpf_cgroup_storage_type { 330 BPF_CGROUP_STORAGE_SHARED, 331 BPF_CGROUP_STORAGE_PERCPU, 332 __BPF_CGROUP_STORAGE_MAX 333 }; 334 335 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX 336 337 struct bpf_prog_aux { 338 atomic_t refcnt; 339 u32 used_map_cnt; 340 u32 max_ctx_offset; 341 u32 max_pkt_offset; 342 u32 stack_depth; 343 u32 id; 344 u32 func_cnt; /* used by non-func prog as the number of func progs */ 345 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */ 346 bool offload_requested; 347 struct bpf_prog **func; 348 void *jit_data; /* JIT specific data. arch dependent */ 349 struct latch_tree_node ksym_tnode; 350 struct list_head ksym_lnode; 351 const struct bpf_prog_ops *ops; 352 struct bpf_map **used_maps; 353 struct bpf_prog *prog; 354 struct user_struct *user; 355 u64 load_time; /* ns since boottime */ 356 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]; 357 char name[BPF_OBJ_NAME_LEN]; 358 #ifdef CONFIG_SECURITY 359 void *security; 360 #endif 361 struct bpf_prog_offload *offload; 362 struct btf *btf; 363 struct bpf_func_info *func_info; 364 /* bpf_line_info loaded from userspace. linfo->insn_off 365 * has the xlated insn offset. 366 * Both the main and sub prog share the same linfo. 367 * The subprog can access its first linfo by 368 * using the linfo_idx. 369 */ 370 struct bpf_line_info *linfo; 371 /* jited_linfo is the jited addr of the linfo. It has a 372 * one to one mapping to linfo: 373 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off. 374 * Both the main and sub prog share the same jited_linfo. 375 * The subprog can access its first jited_linfo by 376 * using the linfo_idx. 377 */ 378 void **jited_linfo; 379 u32 func_info_cnt; 380 u32 nr_linfo; 381 /* subprog can use linfo_idx to access its first linfo and 382 * jited_linfo. 383 * main prog always has linfo_idx == 0 384 */ 385 u32 linfo_idx; 386 union { 387 struct work_struct work; 388 struct rcu_head rcu; 389 }; 390 }; 391 392 struct bpf_array { 393 struct bpf_map map; 394 u32 elem_size; 395 u32 index_mask; 396 /* 'ownership' of prog_array is claimed by the first program that 397 * is going to use this map or by the first program which FD is stored 398 * in the map to make sure that all callers and callees have the same 399 * prog_type and JITed flag 400 */ 401 enum bpf_prog_type owner_prog_type; 402 bool owner_jited; 403 union { 404 char value[0] __aligned(8); 405 void *ptrs[0] __aligned(8); 406 void __percpu *pptrs[0] __aligned(8); 407 }; 408 }; 409 410 #define MAX_TAIL_CALL_CNT 32 411 412 struct bpf_event_entry { 413 struct perf_event *event; 414 struct file *perf_file; 415 struct file *map_file; 416 struct rcu_head rcu; 417 }; 418 419 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp); 420 int bpf_prog_calc_tag(struct bpf_prog *fp); 421 422 const struct bpf_func_proto *bpf_get_trace_printk_proto(void); 423 424 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src, 425 unsigned long off, unsigned long len); 426 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type, 427 const struct bpf_insn *src, 428 struct bpf_insn *dst, 429 struct bpf_prog *prog, 430 u32 *target_size); 431 432 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, 433 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy); 434 435 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, 436 union bpf_attr __user *uattr); 437 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, 438 union bpf_attr __user *uattr); 439 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, 440 const union bpf_attr *kattr, 441 union bpf_attr __user *uattr); 442 443 /* an array of programs to be executed under rcu_lock. 444 * 445 * Typical usage: 446 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN); 447 * 448 * the structure returned by bpf_prog_array_alloc() should be populated 449 * with program pointers and the last pointer must be NULL. 450 * The user has to keep refcnt on the program and make sure the program 451 * is removed from the array before bpf_prog_put(). 452 * The 'struct bpf_prog_array *' should only be replaced with xchg() 453 * since other cpus are walking the array of pointers in parallel. 454 */ 455 struct bpf_prog_array_item { 456 struct bpf_prog *prog; 457 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]; 458 }; 459 460 struct bpf_prog_array { 461 struct rcu_head rcu; 462 struct bpf_prog_array_item items[0]; 463 }; 464 465 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags); 466 void bpf_prog_array_free(struct bpf_prog_array __rcu *progs); 467 int bpf_prog_array_length(struct bpf_prog_array __rcu *progs); 468 int bpf_prog_array_copy_to_user(struct bpf_prog_array __rcu *progs, 469 __u32 __user *prog_ids, u32 cnt); 470 471 void bpf_prog_array_delete_safe(struct bpf_prog_array __rcu *progs, 472 struct bpf_prog *old_prog); 473 int bpf_prog_array_copy_info(struct bpf_prog_array __rcu *array, 474 u32 *prog_ids, u32 request_cnt, 475 u32 *prog_cnt); 476 int bpf_prog_array_copy(struct bpf_prog_array __rcu *old_array, 477 struct bpf_prog *exclude_prog, 478 struct bpf_prog *include_prog, 479 struct bpf_prog_array **new_array); 480 481 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null) \ 482 ({ \ 483 struct bpf_prog_array_item *_item; \ 484 struct bpf_prog *_prog; \ 485 struct bpf_prog_array *_array; \ 486 u32 _ret = 1; \ 487 preempt_disable(); \ 488 rcu_read_lock(); \ 489 _array = rcu_dereference(array); \ 490 if (unlikely(check_non_null && !_array))\ 491 goto _out; \ 492 _item = &_array->items[0]; \ 493 while ((_prog = READ_ONCE(_item->prog))) { \ 494 bpf_cgroup_storage_set(_item->cgroup_storage); \ 495 _ret &= func(_prog, ctx); \ 496 _item++; \ 497 } \ 498 _out: \ 499 rcu_read_unlock(); \ 500 preempt_enable_no_resched(); \ 501 _ret; \ 502 }) 503 504 #define BPF_PROG_RUN_ARRAY(array, ctx, func) \ 505 __BPF_PROG_RUN_ARRAY(array, ctx, func, false) 506 507 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \ 508 __BPF_PROG_RUN_ARRAY(array, ctx, func, true) 509 510 #ifdef CONFIG_BPF_SYSCALL 511 DECLARE_PER_CPU(int, bpf_prog_active); 512 513 extern const struct file_operations bpf_map_fops; 514 extern const struct file_operations bpf_prog_fops; 515 516 #define BPF_PROG_TYPE(_id, _name) \ 517 extern const struct bpf_prog_ops _name ## _prog_ops; \ 518 extern const struct bpf_verifier_ops _name ## _verifier_ops; 519 #define BPF_MAP_TYPE(_id, _ops) \ 520 extern const struct bpf_map_ops _ops; 521 #include <linux/bpf_types.h> 522 #undef BPF_PROG_TYPE 523 #undef BPF_MAP_TYPE 524 525 extern const struct bpf_prog_ops bpf_offload_prog_ops; 526 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops; 527 extern const struct bpf_verifier_ops xdp_analyzer_ops; 528 529 struct bpf_prog *bpf_prog_get(u32 ufd); 530 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, 531 bool attach_drv); 532 struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, int i); 533 void bpf_prog_sub(struct bpf_prog *prog, int i); 534 struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog); 535 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog); 536 void bpf_prog_put(struct bpf_prog *prog); 537 int __bpf_prog_charge(struct user_struct *user, u32 pages); 538 void __bpf_prog_uncharge(struct user_struct *user, u32 pages); 539 540 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock); 541 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock); 542 543 struct bpf_map *bpf_map_get_with_uref(u32 ufd); 544 struct bpf_map *__bpf_map_get(struct fd f); 545 struct bpf_map * __must_check bpf_map_inc(struct bpf_map *map, bool uref); 546 void bpf_map_put_with_uref(struct bpf_map *map); 547 void bpf_map_put(struct bpf_map *map); 548 int bpf_map_precharge_memlock(u32 pages); 549 int bpf_map_charge_memlock(struct bpf_map *map, u32 pages); 550 void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages); 551 void *bpf_map_area_alloc(size_t size, int numa_node); 552 void bpf_map_area_free(void *base); 553 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr); 554 555 extern int sysctl_unprivileged_bpf_disabled; 556 557 int bpf_map_new_fd(struct bpf_map *map, int flags); 558 int bpf_prog_new_fd(struct bpf_prog *prog); 559 560 int bpf_obj_pin_user(u32 ufd, const char __user *pathname); 561 int bpf_obj_get_user(const char __user *pathname, int flags); 562 563 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value); 564 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value); 565 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value, 566 u64 flags); 567 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value, 568 u64 flags); 569 570 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value); 571 572 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file, 573 void *key, void *value, u64 map_flags); 574 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 575 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file, 576 void *key, void *value, u64 map_flags); 577 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 578 579 int bpf_get_file_flag(int flags); 580 int bpf_check_uarg_tail_zero(void __user *uaddr, size_t expected_size, 581 size_t actual_size); 582 583 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and 584 * forced to use 'long' read/writes to try to atomically copy long counters. 585 * Best-effort only. No barriers here, since it _will_ race with concurrent 586 * updates from BPF programs. Called from bpf syscall and mostly used with 587 * size 8 or 16 bytes, so ask compiler to inline it. 588 */ 589 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size) 590 { 591 const long *lsrc = src; 592 long *ldst = dst; 593 594 size /= sizeof(long); 595 while (size--) 596 *ldst++ = *lsrc++; 597 } 598 599 /* verify correctness of eBPF program */ 600 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, 601 union bpf_attr __user *uattr); 602 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth); 603 604 /* Map specifics */ 605 struct xdp_buff; 606 struct sk_buff; 607 608 struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key); 609 void __dev_map_insert_ctx(struct bpf_map *map, u32 index); 610 void __dev_map_flush(struct bpf_map *map); 611 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, 612 struct net_device *dev_rx); 613 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb, 614 struct bpf_prog *xdp_prog); 615 616 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key); 617 void __cpu_map_insert_ctx(struct bpf_map *map, u32 index); 618 void __cpu_map_flush(struct bpf_map *map); 619 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp, 620 struct net_device *dev_rx); 621 622 /* Return map's numa specified by userspace */ 623 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr) 624 { 625 return (attr->map_flags & BPF_F_NUMA_NODE) ? 626 attr->numa_node : NUMA_NO_NODE; 627 } 628 629 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type); 630 int array_map_alloc_check(union bpf_attr *attr); 631 632 #else /* !CONFIG_BPF_SYSCALL */ 633 static inline struct bpf_prog *bpf_prog_get(u32 ufd) 634 { 635 return ERR_PTR(-EOPNOTSUPP); 636 } 637 638 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, 639 enum bpf_prog_type type, 640 bool attach_drv) 641 { 642 return ERR_PTR(-EOPNOTSUPP); 643 } 644 645 static inline struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, 646 int i) 647 { 648 return ERR_PTR(-EOPNOTSUPP); 649 } 650 651 static inline void bpf_prog_sub(struct bpf_prog *prog, int i) 652 { 653 } 654 655 static inline void bpf_prog_put(struct bpf_prog *prog) 656 { 657 } 658 659 static inline struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog) 660 { 661 return ERR_PTR(-EOPNOTSUPP); 662 } 663 664 static inline struct bpf_prog *__must_check 665 bpf_prog_inc_not_zero(struct bpf_prog *prog) 666 { 667 return ERR_PTR(-EOPNOTSUPP); 668 } 669 670 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages) 671 { 672 return 0; 673 } 674 675 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages) 676 { 677 } 678 679 static inline int bpf_obj_get_user(const char __user *pathname, int flags) 680 { 681 return -EOPNOTSUPP; 682 } 683 684 static inline struct net_device *__dev_map_lookup_elem(struct bpf_map *map, 685 u32 key) 686 { 687 return NULL; 688 } 689 690 static inline void __dev_map_insert_ctx(struct bpf_map *map, u32 index) 691 { 692 } 693 694 static inline void __dev_map_flush(struct bpf_map *map) 695 { 696 } 697 698 struct xdp_buff; 699 struct bpf_dtab_netdev; 700 701 static inline 702 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, 703 struct net_device *dev_rx) 704 { 705 return 0; 706 } 707 708 struct sk_buff; 709 710 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, 711 struct sk_buff *skb, 712 struct bpf_prog *xdp_prog) 713 { 714 return 0; 715 } 716 717 static inline 718 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key) 719 { 720 return NULL; 721 } 722 723 static inline void __cpu_map_insert_ctx(struct bpf_map *map, u32 index) 724 { 725 } 726 727 static inline void __cpu_map_flush(struct bpf_map *map) 728 { 729 } 730 731 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, 732 struct xdp_buff *xdp, 733 struct net_device *dev_rx) 734 { 735 return 0; 736 } 737 738 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name, 739 enum bpf_prog_type type) 740 { 741 return ERR_PTR(-EOPNOTSUPP); 742 } 743 #endif /* CONFIG_BPF_SYSCALL */ 744 745 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd, 746 enum bpf_prog_type type) 747 { 748 return bpf_prog_get_type_dev(ufd, type, false); 749 } 750 751 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool); 752 753 int bpf_prog_offload_compile(struct bpf_prog *prog); 754 void bpf_prog_offload_destroy(struct bpf_prog *prog); 755 int bpf_prog_offload_info_fill(struct bpf_prog_info *info, 756 struct bpf_prog *prog); 757 758 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map); 759 760 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value); 761 int bpf_map_offload_update_elem(struct bpf_map *map, 762 void *key, void *value, u64 flags); 763 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key); 764 int bpf_map_offload_get_next_key(struct bpf_map *map, 765 void *key, void *next_key); 766 767 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map); 768 769 struct bpf_offload_dev * 770 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops); 771 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev); 772 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev, 773 struct net_device *netdev); 774 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev, 775 struct net_device *netdev); 776 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev); 777 778 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL) 779 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr); 780 781 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux) 782 { 783 return aux->offload_requested; 784 } 785 786 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 787 { 788 return unlikely(map->ops == &bpf_map_offload_ops); 789 } 790 791 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr); 792 void bpf_map_offload_map_free(struct bpf_map *map); 793 #else 794 static inline int bpf_prog_offload_init(struct bpf_prog *prog, 795 union bpf_attr *attr) 796 { 797 return -EOPNOTSUPP; 798 } 799 800 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux) 801 { 802 return false; 803 } 804 805 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 806 { 807 return false; 808 } 809 810 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr) 811 { 812 return ERR_PTR(-EOPNOTSUPP); 813 } 814 815 static inline void bpf_map_offload_map_free(struct bpf_map *map) 816 { 817 } 818 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */ 819 820 #if defined(CONFIG_BPF_STREAM_PARSER) 821 int sock_map_prog_update(struct bpf_map *map, struct bpf_prog *prog, u32 which); 822 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog); 823 #else 824 static inline int sock_map_prog_update(struct bpf_map *map, 825 struct bpf_prog *prog, u32 which) 826 { 827 return -EOPNOTSUPP; 828 } 829 830 static inline int sock_map_get_from_fd(const union bpf_attr *attr, 831 struct bpf_prog *prog) 832 { 833 return -EINVAL; 834 } 835 #endif 836 837 #if defined(CONFIG_XDP_SOCKETS) 838 struct xdp_sock; 839 struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, u32 key); 840 int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp, 841 struct xdp_sock *xs); 842 void __xsk_map_flush(struct bpf_map *map); 843 #else 844 struct xdp_sock; 845 static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, 846 u32 key) 847 { 848 return NULL; 849 } 850 851 static inline int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp, 852 struct xdp_sock *xs) 853 { 854 return -EOPNOTSUPP; 855 } 856 857 static inline void __xsk_map_flush(struct bpf_map *map) 858 { 859 } 860 #endif 861 862 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) 863 void bpf_sk_reuseport_detach(struct sock *sk); 864 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key, 865 void *value); 866 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key, 867 void *value, u64 map_flags); 868 #else 869 static inline void bpf_sk_reuseport_detach(struct sock *sk) 870 { 871 } 872 873 #ifdef CONFIG_BPF_SYSCALL 874 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, 875 void *key, void *value) 876 { 877 return -EOPNOTSUPP; 878 } 879 880 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, 881 void *key, void *value, 882 u64 map_flags) 883 { 884 return -EOPNOTSUPP; 885 } 886 #endif /* CONFIG_BPF_SYSCALL */ 887 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */ 888 889 /* verifier prototypes for helper functions called from eBPF programs */ 890 extern const struct bpf_func_proto bpf_map_lookup_elem_proto; 891 extern const struct bpf_func_proto bpf_map_update_elem_proto; 892 extern const struct bpf_func_proto bpf_map_delete_elem_proto; 893 extern const struct bpf_func_proto bpf_map_push_elem_proto; 894 extern const struct bpf_func_proto bpf_map_pop_elem_proto; 895 extern const struct bpf_func_proto bpf_map_peek_elem_proto; 896 897 extern const struct bpf_func_proto bpf_get_prandom_u32_proto; 898 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto; 899 extern const struct bpf_func_proto bpf_get_numa_node_id_proto; 900 extern const struct bpf_func_proto bpf_tail_call_proto; 901 extern const struct bpf_func_proto bpf_ktime_get_ns_proto; 902 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto; 903 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto; 904 extern const struct bpf_func_proto bpf_get_current_comm_proto; 905 extern const struct bpf_func_proto bpf_get_stackid_proto; 906 extern const struct bpf_func_proto bpf_get_stack_proto; 907 extern const struct bpf_func_proto bpf_sock_map_update_proto; 908 extern const struct bpf_func_proto bpf_sock_hash_update_proto; 909 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto; 910 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto; 911 extern const struct bpf_func_proto bpf_msg_redirect_map_proto; 912 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto; 913 extern const struct bpf_func_proto bpf_sk_redirect_map_proto; 914 extern const struct bpf_func_proto bpf_spin_lock_proto; 915 extern const struct bpf_func_proto bpf_spin_unlock_proto; 916 extern const struct bpf_func_proto bpf_get_local_storage_proto; 917 918 /* Shared helpers among cBPF and eBPF. */ 919 void bpf_user_rnd_init_once(void); 920 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 921 922 #if defined(CONFIG_NET) 923 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type, 924 struct bpf_insn_access_aux *info); 925 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 926 const struct bpf_insn *si, 927 struct bpf_insn *insn_buf, 928 struct bpf_prog *prog, 929 u32 *target_size); 930 #else 931 static inline bool bpf_sock_is_valid_access(int off, int size, 932 enum bpf_access_type type, 933 struct bpf_insn_access_aux *info) 934 { 935 return false; 936 } 937 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 938 const struct bpf_insn *si, 939 struct bpf_insn *insn_buf, 940 struct bpf_prog *prog, 941 u32 *target_size) 942 { 943 return 0; 944 } 945 #endif 946 947 #endif /* _LINUX_BPF_H */ 948