1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com 3 */ 4 #ifndef _LINUX_BPF_H 5 #define _LINUX_BPF_H 1 6 7 #include <uapi/linux/bpf.h> 8 #include <uapi/linux/filter.h> 9 10 #include <linux/workqueue.h> 11 #include <linux/file.h> 12 #include <linux/percpu.h> 13 #include <linux/err.h> 14 #include <linux/rbtree_latch.h> 15 #include <linux/numa.h> 16 #include <linux/mm_types.h> 17 #include <linux/wait.h> 18 #include <linux/refcount.h> 19 #include <linux/mutex.h> 20 #include <linux/module.h> 21 #include <linux/kallsyms.h> 22 #include <linux/capability.h> 23 #include <linux/sched/mm.h> 24 #include <linux/slab.h> 25 #include <linux/percpu-refcount.h> 26 #include <linux/stddef.h> 27 #include <linux/bpfptr.h> 28 #include <linux/btf.h> 29 #include <linux/rcupdate_trace.h> 30 #include <linux/static_call.h> 31 #include <linux/memcontrol.h> 32 #include <linux/cfi.h> 33 34 struct bpf_verifier_env; 35 struct bpf_verifier_log; 36 struct perf_event; 37 struct bpf_prog; 38 struct bpf_prog_aux; 39 struct bpf_map; 40 struct bpf_arena; 41 struct sock; 42 struct seq_file; 43 struct btf; 44 struct btf_type; 45 struct exception_table_entry; 46 struct seq_operations; 47 struct bpf_iter_aux_info; 48 struct bpf_local_storage; 49 struct bpf_local_storage_map; 50 struct kobject; 51 struct mem_cgroup; 52 struct module; 53 struct bpf_func_state; 54 struct ftrace_ops; 55 struct cgroup; 56 struct bpf_token; 57 struct user_namespace; 58 struct super_block; 59 struct inode; 60 61 extern struct idr btf_idr; 62 extern spinlock_t btf_idr_lock; 63 extern struct kobject *btf_kobj; 64 extern struct bpf_mem_alloc bpf_global_ma, bpf_global_percpu_ma; 65 extern bool bpf_global_ma_set; 66 67 typedef u64 (*bpf_callback_t)(u64, u64, u64, u64, u64); 68 typedef int (*bpf_iter_init_seq_priv_t)(void *private_data, 69 struct bpf_iter_aux_info *aux); 70 typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data); 71 typedef unsigned int (*bpf_func_t)(const void *, 72 const struct bpf_insn *); 73 struct bpf_iter_seq_info { 74 const struct seq_operations *seq_ops; 75 bpf_iter_init_seq_priv_t init_seq_private; 76 bpf_iter_fini_seq_priv_t fini_seq_private; 77 u32 seq_priv_size; 78 }; 79 80 /* map is generic key/value storage optionally accessible by eBPF programs */ 81 struct bpf_map_ops { 82 /* funcs callable from userspace (via syscall) */ 83 int (*map_alloc_check)(union bpf_attr *attr); 84 struct bpf_map *(*map_alloc)(union bpf_attr *attr); 85 void (*map_release)(struct bpf_map *map, struct file *map_file); 86 void (*map_free)(struct bpf_map *map); 87 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key); 88 void (*map_release_uref)(struct bpf_map *map); 89 void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key); 90 int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr, 91 union bpf_attr __user *uattr); 92 int (*map_lookup_and_delete_elem)(struct bpf_map *map, void *key, 93 void *value, u64 flags); 94 int (*map_lookup_and_delete_batch)(struct bpf_map *map, 95 const union bpf_attr *attr, 96 union bpf_attr __user *uattr); 97 int (*map_update_batch)(struct bpf_map *map, struct file *map_file, 98 const union bpf_attr *attr, 99 union bpf_attr __user *uattr); 100 int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr, 101 union bpf_attr __user *uattr); 102 103 /* funcs callable from userspace and from eBPF programs */ 104 void *(*map_lookup_elem)(struct bpf_map *map, void *key); 105 long (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags); 106 long (*map_delete_elem)(struct bpf_map *map, void *key); 107 long (*map_push_elem)(struct bpf_map *map, void *value, u64 flags); 108 long (*map_pop_elem)(struct bpf_map *map, void *value); 109 long (*map_peek_elem)(struct bpf_map *map, void *value); 110 void *(*map_lookup_percpu_elem)(struct bpf_map *map, void *key, u32 cpu); 111 112 /* funcs called by prog_array and perf_event_array map */ 113 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file, 114 int fd); 115 /* If need_defer is true, the implementation should guarantee that 116 * the to-be-put element is still alive before the bpf program, which 117 * may manipulate it, exists. 118 */ 119 void (*map_fd_put_ptr)(struct bpf_map *map, void *ptr, bool need_defer); 120 int (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf); 121 u32 (*map_fd_sys_lookup_elem)(void *ptr); 122 void (*map_seq_show_elem)(struct bpf_map *map, void *key, 123 struct seq_file *m); 124 int (*map_check_btf)(const struct bpf_map *map, 125 const struct btf *btf, 126 const struct btf_type *key_type, 127 const struct btf_type *value_type); 128 129 /* Prog poke tracking helpers. */ 130 int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux); 131 void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux); 132 void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old, 133 struct bpf_prog *new); 134 135 /* Direct value access helpers. */ 136 int (*map_direct_value_addr)(const struct bpf_map *map, 137 u64 *imm, u32 off); 138 int (*map_direct_value_meta)(const struct bpf_map *map, 139 u64 imm, u32 *off); 140 int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma); 141 __poll_t (*map_poll)(struct bpf_map *map, struct file *filp, 142 struct poll_table_struct *pts); 143 unsigned long (*map_get_unmapped_area)(struct file *filep, unsigned long addr, 144 unsigned long len, unsigned long pgoff, 145 unsigned long flags); 146 147 /* Functions called by bpf_local_storage maps */ 148 int (*map_local_storage_charge)(struct bpf_local_storage_map *smap, 149 void *owner, u32 size); 150 void (*map_local_storage_uncharge)(struct bpf_local_storage_map *smap, 151 void *owner, u32 size); 152 struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner); 153 154 /* Misc helpers.*/ 155 long (*map_redirect)(struct bpf_map *map, u64 key, u64 flags); 156 157 /* map_meta_equal must be implemented for maps that can be 158 * used as an inner map. It is a runtime check to ensure 159 * an inner map can be inserted to an outer map. 160 * 161 * Some properties of the inner map has been used during the 162 * verification time. When inserting an inner map at the runtime, 163 * map_meta_equal has to ensure the inserting map has the same 164 * properties that the verifier has used earlier. 165 */ 166 bool (*map_meta_equal)(const struct bpf_map *meta0, 167 const struct bpf_map *meta1); 168 169 170 int (*map_set_for_each_callback_args)(struct bpf_verifier_env *env, 171 struct bpf_func_state *caller, 172 struct bpf_func_state *callee); 173 long (*map_for_each_callback)(struct bpf_map *map, 174 bpf_callback_t callback_fn, 175 void *callback_ctx, u64 flags); 176 177 u64 (*map_mem_usage)(const struct bpf_map *map); 178 179 /* BTF id of struct allocated by map_alloc */ 180 int *map_btf_id; 181 182 /* bpf_iter info used to open a seq_file */ 183 const struct bpf_iter_seq_info *iter_seq_info; 184 }; 185 186 enum { 187 /* Support at most 10 fields in a BTF type */ 188 BTF_FIELDS_MAX = 10, 189 }; 190 191 enum btf_field_type { 192 BPF_SPIN_LOCK = (1 << 0), 193 BPF_TIMER = (1 << 1), 194 BPF_KPTR_UNREF = (1 << 2), 195 BPF_KPTR_REF = (1 << 3), 196 BPF_KPTR_PERCPU = (1 << 4), 197 BPF_KPTR = BPF_KPTR_UNREF | BPF_KPTR_REF | BPF_KPTR_PERCPU, 198 BPF_LIST_HEAD = (1 << 5), 199 BPF_LIST_NODE = (1 << 6), 200 BPF_RB_ROOT = (1 << 7), 201 BPF_RB_NODE = (1 << 8), 202 BPF_GRAPH_NODE = BPF_RB_NODE | BPF_LIST_NODE, 203 BPF_GRAPH_ROOT = BPF_RB_ROOT | BPF_LIST_HEAD, 204 BPF_REFCOUNT = (1 << 9), 205 }; 206 207 typedef void (*btf_dtor_kfunc_t)(void *); 208 209 struct btf_field_kptr { 210 struct btf *btf; 211 struct module *module; 212 /* dtor used if btf_is_kernel(btf), otherwise the type is 213 * program-allocated, dtor is NULL, and __bpf_obj_drop_impl is used 214 */ 215 btf_dtor_kfunc_t dtor; 216 u32 btf_id; 217 }; 218 219 struct btf_field_graph_root { 220 struct btf *btf; 221 u32 value_btf_id; 222 u32 node_offset; 223 struct btf_record *value_rec; 224 }; 225 226 struct btf_field { 227 u32 offset; 228 u32 size; 229 enum btf_field_type type; 230 union { 231 struct btf_field_kptr kptr; 232 struct btf_field_graph_root graph_root; 233 }; 234 }; 235 236 struct btf_record { 237 u32 cnt; 238 u32 field_mask; 239 int spin_lock_off; 240 int timer_off; 241 int refcount_off; 242 struct btf_field fields[]; 243 }; 244 245 /* Non-opaque version of bpf_rb_node in uapi/linux/bpf.h */ 246 struct bpf_rb_node_kern { 247 struct rb_node rb_node; 248 void *owner; 249 } __attribute__((aligned(8))); 250 251 /* Non-opaque version of bpf_list_node in uapi/linux/bpf.h */ 252 struct bpf_list_node_kern { 253 struct list_head list_head; 254 void *owner; 255 } __attribute__((aligned(8))); 256 257 struct bpf_map { 258 const struct bpf_map_ops *ops; 259 struct bpf_map *inner_map_meta; 260 #ifdef CONFIG_SECURITY 261 void *security; 262 #endif 263 enum bpf_map_type map_type; 264 u32 key_size; 265 u32 value_size; 266 u32 max_entries; 267 u64 map_extra; /* any per-map-type extra fields */ 268 u32 map_flags; 269 u32 id; 270 struct btf_record *record; 271 int numa_node; 272 u32 btf_key_type_id; 273 u32 btf_value_type_id; 274 u32 btf_vmlinux_value_type_id; 275 struct btf *btf; 276 #ifdef CONFIG_MEMCG_KMEM 277 struct obj_cgroup *objcg; 278 #endif 279 char name[BPF_OBJ_NAME_LEN]; 280 struct mutex freeze_mutex; 281 atomic64_t refcnt; 282 atomic64_t usercnt; 283 /* rcu is used before freeing and work is only used during freeing */ 284 union { 285 struct work_struct work; 286 struct rcu_head rcu; 287 }; 288 atomic64_t writecnt; 289 /* 'Ownership' of program-containing map is claimed by the first program 290 * that is going to use this map or by the first program which FD is 291 * stored in the map to make sure that all callers and callees have the 292 * same prog type, JITed flag and xdp_has_frags flag. 293 */ 294 struct { 295 spinlock_t lock; 296 enum bpf_prog_type type; 297 bool jited; 298 bool xdp_has_frags; 299 } owner; 300 bool bypass_spec_v1; 301 bool frozen; /* write-once; write-protected by freeze_mutex */ 302 bool free_after_mult_rcu_gp; 303 bool free_after_rcu_gp; 304 atomic64_t sleepable_refcnt; 305 s64 __percpu *elem_count; 306 }; 307 308 static inline const char *btf_field_type_name(enum btf_field_type type) 309 { 310 switch (type) { 311 case BPF_SPIN_LOCK: 312 return "bpf_spin_lock"; 313 case BPF_TIMER: 314 return "bpf_timer"; 315 case BPF_KPTR_UNREF: 316 case BPF_KPTR_REF: 317 return "kptr"; 318 case BPF_KPTR_PERCPU: 319 return "percpu_kptr"; 320 case BPF_LIST_HEAD: 321 return "bpf_list_head"; 322 case BPF_LIST_NODE: 323 return "bpf_list_node"; 324 case BPF_RB_ROOT: 325 return "bpf_rb_root"; 326 case BPF_RB_NODE: 327 return "bpf_rb_node"; 328 case BPF_REFCOUNT: 329 return "bpf_refcount"; 330 default: 331 WARN_ON_ONCE(1); 332 return "unknown"; 333 } 334 } 335 336 static inline u32 btf_field_type_size(enum btf_field_type type) 337 { 338 switch (type) { 339 case BPF_SPIN_LOCK: 340 return sizeof(struct bpf_spin_lock); 341 case BPF_TIMER: 342 return sizeof(struct bpf_timer); 343 case BPF_KPTR_UNREF: 344 case BPF_KPTR_REF: 345 case BPF_KPTR_PERCPU: 346 return sizeof(u64); 347 case BPF_LIST_HEAD: 348 return sizeof(struct bpf_list_head); 349 case BPF_LIST_NODE: 350 return sizeof(struct bpf_list_node); 351 case BPF_RB_ROOT: 352 return sizeof(struct bpf_rb_root); 353 case BPF_RB_NODE: 354 return sizeof(struct bpf_rb_node); 355 case BPF_REFCOUNT: 356 return sizeof(struct bpf_refcount); 357 default: 358 WARN_ON_ONCE(1); 359 return 0; 360 } 361 } 362 363 static inline u32 btf_field_type_align(enum btf_field_type type) 364 { 365 switch (type) { 366 case BPF_SPIN_LOCK: 367 return __alignof__(struct bpf_spin_lock); 368 case BPF_TIMER: 369 return __alignof__(struct bpf_timer); 370 case BPF_KPTR_UNREF: 371 case BPF_KPTR_REF: 372 case BPF_KPTR_PERCPU: 373 return __alignof__(u64); 374 case BPF_LIST_HEAD: 375 return __alignof__(struct bpf_list_head); 376 case BPF_LIST_NODE: 377 return __alignof__(struct bpf_list_node); 378 case BPF_RB_ROOT: 379 return __alignof__(struct bpf_rb_root); 380 case BPF_RB_NODE: 381 return __alignof__(struct bpf_rb_node); 382 case BPF_REFCOUNT: 383 return __alignof__(struct bpf_refcount); 384 default: 385 WARN_ON_ONCE(1); 386 return 0; 387 } 388 } 389 390 static inline void bpf_obj_init_field(const struct btf_field *field, void *addr) 391 { 392 memset(addr, 0, field->size); 393 394 switch (field->type) { 395 case BPF_REFCOUNT: 396 refcount_set((refcount_t *)addr, 1); 397 break; 398 case BPF_RB_NODE: 399 RB_CLEAR_NODE((struct rb_node *)addr); 400 break; 401 case BPF_LIST_HEAD: 402 case BPF_LIST_NODE: 403 INIT_LIST_HEAD((struct list_head *)addr); 404 break; 405 case BPF_RB_ROOT: 406 /* RB_ROOT_CACHED 0-inits, no need to do anything after memset */ 407 case BPF_SPIN_LOCK: 408 case BPF_TIMER: 409 case BPF_KPTR_UNREF: 410 case BPF_KPTR_REF: 411 case BPF_KPTR_PERCPU: 412 break; 413 default: 414 WARN_ON_ONCE(1); 415 return; 416 } 417 } 418 419 static inline bool btf_record_has_field(const struct btf_record *rec, enum btf_field_type type) 420 { 421 if (IS_ERR_OR_NULL(rec)) 422 return false; 423 return rec->field_mask & type; 424 } 425 426 static inline void bpf_obj_init(const struct btf_record *rec, void *obj) 427 { 428 int i; 429 430 if (IS_ERR_OR_NULL(rec)) 431 return; 432 for (i = 0; i < rec->cnt; i++) 433 bpf_obj_init_field(&rec->fields[i], obj + rec->fields[i].offset); 434 } 435 436 /* 'dst' must be a temporary buffer and should not point to memory that is being 437 * used in parallel by a bpf program or bpf syscall, otherwise the access from 438 * the bpf program or bpf syscall may be corrupted by the reinitialization, 439 * leading to weird problems. Even 'dst' is newly-allocated from bpf memory 440 * allocator, it is still possible for 'dst' to be used in parallel by a bpf 441 * program or bpf syscall. 442 */ 443 static inline void check_and_init_map_value(struct bpf_map *map, void *dst) 444 { 445 bpf_obj_init(map->record, dst); 446 } 447 448 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and 449 * forced to use 'long' read/writes to try to atomically copy long counters. 450 * Best-effort only. No barriers here, since it _will_ race with concurrent 451 * updates from BPF programs. Called from bpf syscall and mostly used with 452 * size 8 or 16 bytes, so ask compiler to inline it. 453 */ 454 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size) 455 { 456 const long *lsrc = src; 457 long *ldst = dst; 458 459 size /= sizeof(long); 460 while (size--) 461 data_race(*ldst++ = *lsrc++); 462 } 463 464 /* copy everything but bpf_spin_lock, bpf_timer, and kptrs. There could be one of each. */ 465 static inline void bpf_obj_memcpy(struct btf_record *rec, 466 void *dst, void *src, u32 size, 467 bool long_memcpy) 468 { 469 u32 curr_off = 0; 470 int i; 471 472 if (IS_ERR_OR_NULL(rec)) { 473 if (long_memcpy) 474 bpf_long_memcpy(dst, src, round_up(size, 8)); 475 else 476 memcpy(dst, src, size); 477 return; 478 } 479 480 for (i = 0; i < rec->cnt; i++) { 481 u32 next_off = rec->fields[i].offset; 482 u32 sz = next_off - curr_off; 483 484 memcpy(dst + curr_off, src + curr_off, sz); 485 curr_off += rec->fields[i].size + sz; 486 } 487 memcpy(dst + curr_off, src + curr_off, size - curr_off); 488 } 489 490 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src) 491 { 492 bpf_obj_memcpy(map->record, dst, src, map->value_size, false); 493 } 494 495 static inline void copy_map_value_long(struct bpf_map *map, void *dst, void *src) 496 { 497 bpf_obj_memcpy(map->record, dst, src, map->value_size, true); 498 } 499 500 static inline void bpf_obj_memzero(struct btf_record *rec, void *dst, u32 size) 501 { 502 u32 curr_off = 0; 503 int i; 504 505 if (IS_ERR_OR_NULL(rec)) { 506 memset(dst, 0, size); 507 return; 508 } 509 510 for (i = 0; i < rec->cnt; i++) { 511 u32 next_off = rec->fields[i].offset; 512 u32 sz = next_off - curr_off; 513 514 memset(dst + curr_off, 0, sz); 515 curr_off += rec->fields[i].size + sz; 516 } 517 memset(dst + curr_off, 0, size - curr_off); 518 } 519 520 static inline void zero_map_value(struct bpf_map *map, void *dst) 521 { 522 bpf_obj_memzero(map->record, dst, map->value_size); 523 } 524 525 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src, 526 bool lock_src); 527 void bpf_timer_cancel_and_free(void *timer); 528 void bpf_list_head_free(const struct btf_field *field, void *list_head, 529 struct bpf_spin_lock *spin_lock); 530 void bpf_rb_root_free(const struct btf_field *field, void *rb_root, 531 struct bpf_spin_lock *spin_lock); 532 u64 bpf_arena_get_kern_vm_start(struct bpf_arena *arena); 533 u64 bpf_arena_get_user_vm_start(struct bpf_arena *arena); 534 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size); 535 536 struct bpf_offload_dev; 537 struct bpf_offloaded_map; 538 539 struct bpf_map_dev_ops { 540 int (*map_get_next_key)(struct bpf_offloaded_map *map, 541 void *key, void *next_key); 542 int (*map_lookup_elem)(struct bpf_offloaded_map *map, 543 void *key, void *value); 544 int (*map_update_elem)(struct bpf_offloaded_map *map, 545 void *key, void *value, u64 flags); 546 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key); 547 }; 548 549 struct bpf_offloaded_map { 550 struct bpf_map map; 551 struct net_device *netdev; 552 const struct bpf_map_dev_ops *dev_ops; 553 void *dev_priv; 554 struct list_head offloads; 555 }; 556 557 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map) 558 { 559 return container_of(map, struct bpf_offloaded_map, map); 560 } 561 562 static inline bool bpf_map_offload_neutral(const struct bpf_map *map) 563 { 564 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY; 565 } 566 567 static inline bool bpf_map_support_seq_show(const struct bpf_map *map) 568 { 569 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) && 570 map->ops->map_seq_show_elem; 571 } 572 573 int map_check_no_btf(const struct bpf_map *map, 574 const struct btf *btf, 575 const struct btf_type *key_type, 576 const struct btf_type *value_type); 577 578 bool bpf_map_meta_equal(const struct bpf_map *meta0, 579 const struct bpf_map *meta1); 580 581 extern const struct bpf_map_ops bpf_map_offload_ops; 582 583 /* bpf_type_flag contains a set of flags that are applicable to the values of 584 * arg_type, ret_type and reg_type. For example, a pointer value may be null, 585 * or a memory is read-only. We classify types into two categories: base types 586 * and extended types. Extended types are base types combined with a type flag. 587 * 588 * Currently there are no more than 32 base types in arg_type, ret_type and 589 * reg_types. 590 */ 591 #define BPF_BASE_TYPE_BITS 8 592 593 enum bpf_type_flag { 594 /* PTR may be NULL. */ 595 PTR_MAYBE_NULL = BIT(0 + BPF_BASE_TYPE_BITS), 596 597 /* MEM is read-only. When applied on bpf_arg, it indicates the arg is 598 * compatible with both mutable and immutable memory. 599 */ 600 MEM_RDONLY = BIT(1 + BPF_BASE_TYPE_BITS), 601 602 /* MEM points to BPF ring buffer reservation. */ 603 MEM_RINGBUF = BIT(2 + BPF_BASE_TYPE_BITS), 604 605 /* MEM is in user address space. */ 606 MEM_USER = BIT(3 + BPF_BASE_TYPE_BITS), 607 608 /* MEM is a percpu memory. MEM_PERCPU tags PTR_TO_BTF_ID. When tagged 609 * with MEM_PERCPU, PTR_TO_BTF_ID _cannot_ be directly accessed. In 610 * order to drop this tag, it must be passed into bpf_per_cpu_ptr() 611 * or bpf_this_cpu_ptr(), which will return the pointer corresponding 612 * to the specified cpu. 613 */ 614 MEM_PERCPU = BIT(4 + BPF_BASE_TYPE_BITS), 615 616 /* Indicates that the argument will be released. */ 617 OBJ_RELEASE = BIT(5 + BPF_BASE_TYPE_BITS), 618 619 /* PTR is not trusted. This is only used with PTR_TO_BTF_ID, to mark 620 * unreferenced and referenced kptr loaded from map value using a load 621 * instruction, so that they can only be dereferenced but not escape the 622 * BPF program into the kernel (i.e. cannot be passed as arguments to 623 * kfunc or bpf helpers). 624 */ 625 PTR_UNTRUSTED = BIT(6 + BPF_BASE_TYPE_BITS), 626 627 MEM_UNINIT = BIT(7 + BPF_BASE_TYPE_BITS), 628 629 /* DYNPTR points to memory local to the bpf program. */ 630 DYNPTR_TYPE_LOCAL = BIT(8 + BPF_BASE_TYPE_BITS), 631 632 /* DYNPTR points to a kernel-produced ringbuf record. */ 633 DYNPTR_TYPE_RINGBUF = BIT(9 + BPF_BASE_TYPE_BITS), 634 635 /* Size is known at compile time. */ 636 MEM_FIXED_SIZE = BIT(10 + BPF_BASE_TYPE_BITS), 637 638 /* MEM is of an allocated object of type in program BTF. This is used to 639 * tag PTR_TO_BTF_ID allocated using bpf_obj_new. 640 */ 641 MEM_ALLOC = BIT(11 + BPF_BASE_TYPE_BITS), 642 643 /* PTR was passed from the kernel in a trusted context, and may be 644 * passed to KF_TRUSTED_ARGS kfuncs or BPF helper functions. 645 * Confusingly, this is _not_ the opposite of PTR_UNTRUSTED above. 646 * PTR_UNTRUSTED refers to a kptr that was read directly from a map 647 * without invoking bpf_kptr_xchg(). What we really need to know is 648 * whether a pointer is safe to pass to a kfunc or BPF helper function. 649 * While PTR_UNTRUSTED pointers are unsafe to pass to kfuncs and BPF 650 * helpers, they do not cover all possible instances of unsafe 651 * pointers. For example, a pointer that was obtained from walking a 652 * struct will _not_ get the PTR_UNTRUSTED type modifier, despite the 653 * fact that it may be NULL, invalid, etc. This is due to backwards 654 * compatibility requirements, as this was the behavior that was first 655 * introduced when kptrs were added. The behavior is now considered 656 * deprecated, and PTR_UNTRUSTED will eventually be removed. 657 * 658 * PTR_TRUSTED, on the other hand, is a pointer that the kernel 659 * guarantees to be valid and safe to pass to kfuncs and BPF helpers. 660 * For example, pointers passed to tracepoint arguments are considered 661 * PTR_TRUSTED, as are pointers that are passed to struct_ops 662 * callbacks. As alluded to above, pointers that are obtained from 663 * walking PTR_TRUSTED pointers are _not_ trusted. For example, if a 664 * struct task_struct *task is PTR_TRUSTED, then accessing 665 * task->last_wakee will lose the PTR_TRUSTED modifier when it's stored 666 * in a BPF register. Similarly, pointers passed to certain programs 667 * types such as kretprobes are not guaranteed to be valid, as they may 668 * for example contain an object that was recently freed. 669 */ 670 PTR_TRUSTED = BIT(12 + BPF_BASE_TYPE_BITS), 671 672 /* MEM is tagged with rcu and memory access needs rcu_read_lock protection. */ 673 MEM_RCU = BIT(13 + BPF_BASE_TYPE_BITS), 674 675 /* Used to tag PTR_TO_BTF_ID | MEM_ALLOC references which are non-owning. 676 * Currently only valid for linked-list and rbtree nodes. If the nodes 677 * have a bpf_refcount_field, they must be tagged MEM_RCU as well. 678 */ 679 NON_OWN_REF = BIT(14 + BPF_BASE_TYPE_BITS), 680 681 /* DYNPTR points to sk_buff */ 682 DYNPTR_TYPE_SKB = BIT(15 + BPF_BASE_TYPE_BITS), 683 684 /* DYNPTR points to xdp_buff */ 685 DYNPTR_TYPE_XDP = BIT(16 + BPF_BASE_TYPE_BITS), 686 687 __BPF_TYPE_FLAG_MAX, 688 __BPF_TYPE_LAST_FLAG = __BPF_TYPE_FLAG_MAX - 1, 689 }; 690 691 #define DYNPTR_TYPE_FLAG_MASK (DYNPTR_TYPE_LOCAL | DYNPTR_TYPE_RINGBUF | DYNPTR_TYPE_SKB \ 692 | DYNPTR_TYPE_XDP) 693 694 /* Max number of base types. */ 695 #define BPF_BASE_TYPE_LIMIT (1UL << BPF_BASE_TYPE_BITS) 696 697 /* Max number of all types. */ 698 #define BPF_TYPE_LIMIT (__BPF_TYPE_LAST_FLAG | (__BPF_TYPE_LAST_FLAG - 1)) 699 700 /* function argument constraints */ 701 enum bpf_arg_type { 702 ARG_DONTCARE = 0, /* unused argument in helper function */ 703 704 /* the following constraints used to prototype 705 * bpf_map_lookup/update/delete_elem() functions 706 */ 707 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */ 708 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */ 709 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */ 710 711 /* Used to prototype bpf_memcmp() and other functions that access data 712 * on eBPF program stack 713 */ 714 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */ 715 ARG_PTR_TO_ARENA, 716 717 ARG_CONST_SIZE, /* number of bytes accessed from memory */ 718 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */ 719 720 ARG_PTR_TO_CTX, /* pointer to context */ 721 ARG_ANYTHING, /* any (initialized) argument is ok */ 722 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */ 723 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */ 724 ARG_PTR_TO_INT, /* pointer to int */ 725 ARG_PTR_TO_LONG, /* pointer to long */ 726 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */ 727 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */ 728 ARG_PTR_TO_RINGBUF_MEM, /* pointer to dynamically reserved ringbuf memory */ 729 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */ 730 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */ 731 ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */ 732 ARG_PTR_TO_FUNC, /* pointer to a bpf program function */ 733 ARG_PTR_TO_STACK, /* pointer to stack */ 734 ARG_PTR_TO_CONST_STR, /* pointer to a null terminated read-only string */ 735 ARG_PTR_TO_TIMER, /* pointer to bpf_timer */ 736 ARG_PTR_TO_KPTR, /* pointer to referenced kptr */ 737 ARG_PTR_TO_DYNPTR, /* pointer to bpf_dynptr. See bpf_type_flag for dynptr type */ 738 __BPF_ARG_TYPE_MAX, 739 740 /* Extended arg_types. */ 741 ARG_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MAP_VALUE, 742 ARG_PTR_TO_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MEM, 743 ARG_PTR_TO_CTX_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_CTX, 744 ARG_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_SOCKET, 745 ARG_PTR_TO_STACK_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_STACK, 746 ARG_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_BTF_ID, 747 /* pointer to memory does not need to be initialized, helper function must fill 748 * all bytes or clear them in error case. 749 */ 750 ARG_PTR_TO_UNINIT_MEM = MEM_UNINIT | ARG_PTR_TO_MEM, 751 /* Pointer to valid memory of size known at compile time. */ 752 ARG_PTR_TO_FIXED_SIZE_MEM = MEM_FIXED_SIZE | ARG_PTR_TO_MEM, 753 754 /* This must be the last entry. Its purpose is to ensure the enum is 755 * wide enough to hold the higher bits reserved for bpf_type_flag. 756 */ 757 __BPF_ARG_TYPE_LIMIT = BPF_TYPE_LIMIT, 758 }; 759 static_assert(__BPF_ARG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT); 760 761 /* type of values returned from helper functions */ 762 enum bpf_return_type { 763 RET_INTEGER, /* function returns integer */ 764 RET_VOID, /* function doesn't return anything */ 765 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */ 766 RET_PTR_TO_SOCKET, /* returns a pointer to a socket */ 767 RET_PTR_TO_TCP_SOCK, /* returns a pointer to a tcp_sock */ 768 RET_PTR_TO_SOCK_COMMON, /* returns a pointer to a sock_common */ 769 RET_PTR_TO_MEM, /* returns a pointer to memory */ 770 RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */ 771 RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */ 772 __BPF_RET_TYPE_MAX, 773 774 /* Extended ret_types. */ 775 RET_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MAP_VALUE, 776 RET_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCKET, 777 RET_PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_TCP_SOCK, 778 RET_PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCK_COMMON, 779 RET_PTR_TO_RINGBUF_MEM_OR_NULL = PTR_MAYBE_NULL | MEM_RINGBUF | RET_PTR_TO_MEM, 780 RET_PTR_TO_DYNPTR_MEM_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MEM, 781 RET_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_BTF_ID, 782 RET_PTR_TO_BTF_ID_TRUSTED = PTR_TRUSTED | RET_PTR_TO_BTF_ID, 783 784 /* This must be the last entry. Its purpose is to ensure the enum is 785 * wide enough to hold the higher bits reserved for bpf_type_flag. 786 */ 787 __BPF_RET_TYPE_LIMIT = BPF_TYPE_LIMIT, 788 }; 789 static_assert(__BPF_RET_TYPE_MAX <= BPF_BASE_TYPE_LIMIT); 790 791 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs 792 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL 793 * instructions after verifying 794 */ 795 struct bpf_func_proto { 796 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 797 bool gpl_only; 798 bool pkt_access; 799 bool might_sleep; 800 enum bpf_return_type ret_type; 801 union { 802 struct { 803 enum bpf_arg_type arg1_type; 804 enum bpf_arg_type arg2_type; 805 enum bpf_arg_type arg3_type; 806 enum bpf_arg_type arg4_type; 807 enum bpf_arg_type arg5_type; 808 }; 809 enum bpf_arg_type arg_type[5]; 810 }; 811 union { 812 struct { 813 u32 *arg1_btf_id; 814 u32 *arg2_btf_id; 815 u32 *arg3_btf_id; 816 u32 *arg4_btf_id; 817 u32 *arg5_btf_id; 818 }; 819 u32 *arg_btf_id[5]; 820 struct { 821 size_t arg1_size; 822 size_t arg2_size; 823 size_t arg3_size; 824 size_t arg4_size; 825 size_t arg5_size; 826 }; 827 size_t arg_size[5]; 828 }; 829 int *ret_btf_id; /* return value btf_id */ 830 bool (*allowed)(const struct bpf_prog *prog); 831 }; 832 833 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is 834 * the first argument to eBPF programs. 835 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *' 836 */ 837 struct bpf_context; 838 839 enum bpf_access_type { 840 BPF_READ = 1, 841 BPF_WRITE = 2 842 }; 843 844 /* types of values stored in eBPF registers */ 845 /* Pointer types represent: 846 * pointer 847 * pointer + imm 848 * pointer + (u16) var 849 * pointer + (u16) var + imm 850 * if (range > 0) then [ptr, ptr + range - off) is safe to access 851 * if (id > 0) means that some 'var' was added 852 * if (off > 0) means that 'imm' was added 853 */ 854 enum bpf_reg_type { 855 NOT_INIT = 0, /* nothing was written into register */ 856 SCALAR_VALUE, /* reg doesn't contain a valid pointer */ 857 PTR_TO_CTX, /* reg points to bpf_context */ 858 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */ 859 PTR_TO_MAP_VALUE, /* reg points to map element value */ 860 PTR_TO_MAP_KEY, /* reg points to a map element key */ 861 PTR_TO_STACK, /* reg == frame_pointer + offset */ 862 PTR_TO_PACKET_META, /* skb->data - meta_len */ 863 PTR_TO_PACKET, /* reg points to skb->data */ 864 PTR_TO_PACKET_END, /* skb->data + headlen */ 865 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */ 866 PTR_TO_SOCKET, /* reg points to struct bpf_sock */ 867 PTR_TO_SOCK_COMMON, /* reg points to sock_common */ 868 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */ 869 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */ 870 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */ 871 /* PTR_TO_BTF_ID points to a kernel struct that does not need 872 * to be null checked by the BPF program. This does not imply the 873 * pointer is _not_ null and in practice this can easily be a null 874 * pointer when reading pointer chains. The assumption is program 875 * context will handle null pointer dereference typically via fault 876 * handling. The verifier must keep this in mind and can make no 877 * assumptions about null or non-null when doing branch analysis. 878 * Further, when passed into helpers the helpers can not, without 879 * additional context, assume the value is non-null. 880 */ 881 PTR_TO_BTF_ID, 882 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not 883 * been checked for null. Used primarily to inform the verifier 884 * an explicit null check is required for this struct. 885 */ 886 PTR_TO_MEM, /* reg points to valid memory region */ 887 PTR_TO_ARENA, 888 PTR_TO_BUF, /* reg points to a read/write buffer */ 889 PTR_TO_FUNC, /* reg points to a bpf program function */ 890 CONST_PTR_TO_DYNPTR, /* reg points to a const struct bpf_dynptr */ 891 __BPF_REG_TYPE_MAX, 892 893 /* Extended reg_types. */ 894 PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | PTR_TO_MAP_VALUE, 895 PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCKET, 896 PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON, 897 PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK, 898 PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | PTR_TO_BTF_ID, 899 900 /* This must be the last entry. Its purpose is to ensure the enum is 901 * wide enough to hold the higher bits reserved for bpf_type_flag. 902 */ 903 __BPF_REG_TYPE_LIMIT = BPF_TYPE_LIMIT, 904 }; 905 static_assert(__BPF_REG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT); 906 907 /* The information passed from prog-specific *_is_valid_access 908 * back to the verifier. 909 */ 910 struct bpf_insn_access_aux { 911 enum bpf_reg_type reg_type; 912 union { 913 int ctx_field_size; 914 struct { 915 struct btf *btf; 916 u32 btf_id; 917 }; 918 }; 919 struct bpf_verifier_log *log; /* for verbose logs */ 920 }; 921 922 static inline void 923 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size) 924 { 925 aux->ctx_field_size = size; 926 } 927 928 static bool bpf_is_ldimm64(const struct bpf_insn *insn) 929 { 930 return insn->code == (BPF_LD | BPF_IMM | BPF_DW); 931 } 932 933 static inline bool bpf_pseudo_func(const struct bpf_insn *insn) 934 { 935 return bpf_is_ldimm64(insn) && insn->src_reg == BPF_PSEUDO_FUNC; 936 } 937 938 struct bpf_prog_ops { 939 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr, 940 union bpf_attr __user *uattr); 941 }; 942 943 struct bpf_reg_state; 944 struct bpf_verifier_ops { 945 /* return eBPF function prototype for verification */ 946 const struct bpf_func_proto * 947 (*get_func_proto)(enum bpf_func_id func_id, 948 const struct bpf_prog *prog); 949 950 /* return true if 'size' wide access at offset 'off' within bpf_context 951 * with 'type' (read or write) is allowed 952 */ 953 bool (*is_valid_access)(int off, int size, enum bpf_access_type type, 954 const struct bpf_prog *prog, 955 struct bpf_insn_access_aux *info); 956 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write, 957 const struct bpf_prog *prog); 958 int (*gen_ld_abs)(const struct bpf_insn *orig, 959 struct bpf_insn *insn_buf); 960 u32 (*convert_ctx_access)(enum bpf_access_type type, 961 const struct bpf_insn *src, 962 struct bpf_insn *dst, 963 struct bpf_prog *prog, u32 *target_size); 964 int (*btf_struct_access)(struct bpf_verifier_log *log, 965 const struct bpf_reg_state *reg, 966 int off, int size); 967 }; 968 969 struct bpf_prog_offload_ops { 970 /* verifier basic callbacks */ 971 int (*insn_hook)(struct bpf_verifier_env *env, 972 int insn_idx, int prev_insn_idx); 973 int (*finalize)(struct bpf_verifier_env *env); 974 /* verifier optimization callbacks (called after .finalize) */ 975 int (*replace_insn)(struct bpf_verifier_env *env, u32 off, 976 struct bpf_insn *insn); 977 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt); 978 /* program management callbacks */ 979 int (*prepare)(struct bpf_prog *prog); 980 int (*translate)(struct bpf_prog *prog); 981 void (*destroy)(struct bpf_prog *prog); 982 }; 983 984 struct bpf_prog_offload { 985 struct bpf_prog *prog; 986 struct net_device *netdev; 987 struct bpf_offload_dev *offdev; 988 void *dev_priv; 989 struct list_head offloads; 990 bool dev_state; 991 bool opt_failed; 992 void *jited_image; 993 u32 jited_len; 994 }; 995 996 enum bpf_cgroup_storage_type { 997 BPF_CGROUP_STORAGE_SHARED, 998 BPF_CGROUP_STORAGE_PERCPU, 999 __BPF_CGROUP_STORAGE_MAX 1000 }; 1001 1002 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX 1003 1004 /* The longest tracepoint has 12 args. 1005 * See include/trace/bpf_probe.h 1006 */ 1007 #define MAX_BPF_FUNC_ARGS 12 1008 1009 /* The maximum number of arguments passed through registers 1010 * a single function may have. 1011 */ 1012 #define MAX_BPF_FUNC_REG_ARGS 5 1013 1014 /* The argument is a structure. */ 1015 #define BTF_FMODEL_STRUCT_ARG BIT(0) 1016 1017 /* The argument is signed. */ 1018 #define BTF_FMODEL_SIGNED_ARG BIT(1) 1019 1020 struct btf_func_model { 1021 u8 ret_size; 1022 u8 ret_flags; 1023 u8 nr_args; 1024 u8 arg_size[MAX_BPF_FUNC_ARGS]; 1025 u8 arg_flags[MAX_BPF_FUNC_ARGS]; 1026 }; 1027 1028 /* Restore arguments before returning from trampoline to let original function 1029 * continue executing. This flag is used for fentry progs when there are no 1030 * fexit progs. 1031 */ 1032 #define BPF_TRAMP_F_RESTORE_REGS BIT(0) 1033 /* Call original function after fentry progs, but before fexit progs. 1034 * Makes sense for fentry/fexit, normal calls and indirect calls. 1035 */ 1036 #define BPF_TRAMP_F_CALL_ORIG BIT(1) 1037 /* Skip current frame and return to parent. Makes sense for fentry/fexit 1038 * programs only. Should not be used with normal calls and indirect calls. 1039 */ 1040 #define BPF_TRAMP_F_SKIP_FRAME BIT(2) 1041 /* Store IP address of the caller on the trampoline stack, 1042 * so it's available for trampoline's programs. 1043 */ 1044 #define BPF_TRAMP_F_IP_ARG BIT(3) 1045 /* Return the return value of fentry prog. Only used by bpf_struct_ops. */ 1046 #define BPF_TRAMP_F_RET_FENTRY_RET BIT(4) 1047 1048 /* Get original function from stack instead of from provided direct address. 1049 * Makes sense for trampolines with fexit or fmod_ret programs. 1050 */ 1051 #define BPF_TRAMP_F_ORIG_STACK BIT(5) 1052 1053 /* This trampoline is on a function with another ftrace_ops with IPMODIFY, 1054 * e.g., a live patch. This flag is set and cleared by ftrace call backs, 1055 */ 1056 #define BPF_TRAMP_F_SHARE_IPMODIFY BIT(6) 1057 1058 /* Indicate that current trampoline is in a tail call context. Then, it has to 1059 * cache and restore tail_call_cnt to avoid infinite tail call loop. 1060 */ 1061 #define BPF_TRAMP_F_TAIL_CALL_CTX BIT(7) 1062 1063 /* 1064 * Indicate the trampoline should be suitable to receive indirect calls; 1065 * without this indirectly calling the generated code can result in #UD/#CP, 1066 * depending on the CFI options. 1067 * 1068 * Used by bpf_struct_ops. 1069 * 1070 * Incompatible with FENTRY usage, overloads @func_addr argument. 1071 */ 1072 #define BPF_TRAMP_F_INDIRECT BIT(8) 1073 1074 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50 1075 * bytes on x86. 1076 */ 1077 enum { 1078 #if defined(__s390x__) 1079 BPF_MAX_TRAMP_LINKS = 27, 1080 #else 1081 BPF_MAX_TRAMP_LINKS = 38, 1082 #endif 1083 }; 1084 1085 struct bpf_tramp_links { 1086 struct bpf_tramp_link *links[BPF_MAX_TRAMP_LINKS]; 1087 int nr_links; 1088 }; 1089 1090 struct bpf_tramp_run_ctx; 1091 1092 /* Different use cases for BPF trampoline: 1093 * 1. replace nop at the function entry (kprobe equivalent) 1094 * flags = BPF_TRAMP_F_RESTORE_REGS 1095 * fentry = a set of programs to run before returning from trampoline 1096 * 1097 * 2. replace nop at the function entry (kprobe + kretprobe equivalent) 1098 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME 1099 * orig_call = fentry_ip + MCOUNT_INSN_SIZE 1100 * fentry = a set of program to run before calling original function 1101 * fexit = a set of program to run after original function 1102 * 1103 * 3. replace direct call instruction anywhere in the function body 1104 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid) 1105 * With flags = 0 1106 * fentry = a set of programs to run before returning from trampoline 1107 * With flags = BPF_TRAMP_F_CALL_ORIG 1108 * orig_call = original callback addr or direct function addr 1109 * fentry = a set of program to run before calling original function 1110 * fexit = a set of program to run after original function 1111 */ 1112 struct bpf_tramp_image; 1113 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *image_end, 1114 const struct btf_func_model *m, u32 flags, 1115 struct bpf_tramp_links *tlinks, 1116 void *func_addr); 1117 void *arch_alloc_bpf_trampoline(unsigned int size); 1118 void arch_free_bpf_trampoline(void *image, unsigned int size); 1119 void arch_protect_bpf_trampoline(void *image, unsigned int size); 1120 void arch_unprotect_bpf_trampoline(void *image, unsigned int size); 1121 int arch_bpf_trampoline_size(const struct btf_func_model *m, u32 flags, 1122 struct bpf_tramp_links *tlinks, void *func_addr); 1123 1124 u64 notrace __bpf_prog_enter_sleepable_recur(struct bpf_prog *prog, 1125 struct bpf_tramp_run_ctx *run_ctx); 1126 void notrace __bpf_prog_exit_sleepable_recur(struct bpf_prog *prog, u64 start, 1127 struct bpf_tramp_run_ctx *run_ctx); 1128 void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr); 1129 void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr); 1130 typedef u64 (*bpf_trampoline_enter_t)(struct bpf_prog *prog, 1131 struct bpf_tramp_run_ctx *run_ctx); 1132 typedef void (*bpf_trampoline_exit_t)(struct bpf_prog *prog, u64 start, 1133 struct bpf_tramp_run_ctx *run_ctx); 1134 bpf_trampoline_enter_t bpf_trampoline_enter(const struct bpf_prog *prog); 1135 bpf_trampoline_exit_t bpf_trampoline_exit(const struct bpf_prog *prog); 1136 1137 struct bpf_ksym { 1138 unsigned long start; 1139 unsigned long end; 1140 char name[KSYM_NAME_LEN]; 1141 struct list_head lnode; 1142 struct latch_tree_node tnode; 1143 bool prog; 1144 }; 1145 1146 enum bpf_tramp_prog_type { 1147 BPF_TRAMP_FENTRY, 1148 BPF_TRAMP_FEXIT, 1149 BPF_TRAMP_MODIFY_RETURN, 1150 BPF_TRAMP_MAX, 1151 BPF_TRAMP_REPLACE, /* more than MAX */ 1152 }; 1153 1154 struct bpf_tramp_image { 1155 void *image; 1156 int size; 1157 struct bpf_ksym ksym; 1158 struct percpu_ref pcref; 1159 void *ip_after_call; 1160 void *ip_epilogue; 1161 union { 1162 struct rcu_head rcu; 1163 struct work_struct work; 1164 }; 1165 }; 1166 1167 struct bpf_trampoline { 1168 /* hlist for trampoline_table */ 1169 struct hlist_node hlist; 1170 struct ftrace_ops *fops; 1171 /* serializes access to fields of this trampoline */ 1172 struct mutex mutex; 1173 refcount_t refcnt; 1174 u32 flags; 1175 u64 key; 1176 struct { 1177 struct btf_func_model model; 1178 void *addr; 1179 bool ftrace_managed; 1180 } func; 1181 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF 1182 * program by replacing one of its functions. func.addr is the address 1183 * of the function it replaced. 1184 */ 1185 struct bpf_prog *extension_prog; 1186 /* list of BPF programs using this trampoline */ 1187 struct hlist_head progs_hlist[BPF_TRAMP_MAX]; 1188 /* Number of attached programs. A counter per kind. */ 1189 int progs_cnt[BPF_TRAMP_MAX]; 1190 /* Executable image of trampoline */ 1191 struct bpf_tramp_image *cur_image; 1192 }; 1193 1194 struct bpf_attach_target_info { 1195 struct btf_func_model fmodel; 1196 long tgt_addr; 1197 struct module *tgt_mod; 1198 const char *tgt_name; 1199 const struct btf_type *tgt_type; 1200 }; 1201 1202 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */ 1203 1204 struct bpf_dispatcher_prog { 1205 struct bpf_prog *prog; 1206 refcount_t users; 1207 }; 1208 1209 struct bpf_dispatcher { 1210 /* dispatcher mutex */ 1211 struct mutex mutex; 1212 void *func; 1213 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX]; 1214 int num_progs; 1215 void *image; 1216 void *rw_image; 1217 u32 image_off; 1218 struct bpf_ksym ksym; 1219 #ifdef CONFIG_HAVE_STATIC_CALL 1220 struct static_call_key *sc_key; 1221 void *sc_tramp; 1222 #endif 1223 }; 1224 1225 #ifndef __bpfcall 1226 #define __bpfcall __nocfi 1227 #endif 1228 1229 static __always_inline __bpfcall unsigned int bpf_dispatcher_nop_func( 1230 const void *ctx, 1231 const struct bpf_insn *insnsi, 1232 bpf_func_t bpf_func) 1233 { 1234 return bpf_func(ctx, insnsi); 1235 } 1236 1237 /* the implementation of the opaque uapi struct bpf_dynptr */ 1238 struct bpf_dynptr_kern { 1239 void *data; 1240 /* Size represents the number of usable bytes of dynptr data. 1241 * If for example the offset is at 4 for a local dynptr whose data is 1242 * of type u64, the number of usable bytes is 4. 1243 * 1244 * The upper 8 bits are reserved. It is as follows: 1245 * Bits 0 - 23 = size 1246 * Bits 24 - 30 = dynptr type 1247 * Bit 31 = whether dynptr is read-only 1248 */ 1249 u32 size; 1250 u32 offset; 1251 } __aligned(8); 1252 1253 enum bpf_dynptr_type { 1254 BPF_DYNPTR_TYPE_INVALID, 1255 /* Points to memory that is local to the bpf program */ 1256 BPF_DYNPTR_TYPE_LOCAL, 1257 /* Underlying data is a ringbuf record */ 1258 BPF_DYNPTR_TYPE_RINGBUF, 1259 /* Underlying data is a sk_buff */ 1260 BPF_DYNPTR_TYPE_SKB, 1261 /* Underlying data is a xdp_buff */ 1262 BPF_DYNPTR_TYPE_XDP, 1263 }; 1264 1265 int bpf_dynptr_check_size(u32 size); 1266 u32 __bpf_dynptr_size(const struct bpf_dynptr_kern *ptr); 1267 const void *__bpf_dynptr_data(const struct bpf_dynptr_kern *ptr, u32 len); 1268 void *__bpf_dynptr_data_rw(const struct bpf_dynptr_kern *ptr, u32 len); 1269 1270 #ifdef CONFIG_BPF_JIT 1271 int bpf_trampoline_link_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr); 1272 int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr); 1273 struct bpf_trampoline *bpf_trampoline_get(u64 key, 1274 struct bpf_attach_target_info *tgt_info); 1275 void bpf_trampoline_put(struct bpf_trampoline *tr); 1276 int arch_prepare_bpf_dispatcher(void *image, void *buf, s64 *funcs, int num_funcs); 1277 1278 /* 1279 * When the architecture supports STATIC_CALL replace the bpf_dispatcher_fn 1280 * indirection with a direct call to the bpf program. If the architecture does 1281 * not have STATIC_CALL, avoid a double-indirection. 1282 */ 1283 #ifdef CONFIG_HAVE_STATIC_CALL 1284 1285 #define __BPF_DISPATCHER_SC_INIT(_name) \ 1286 .sc_key = &STATIC_CALL_KEY(_name), \ 1287 .sc_tramp = STATIC_CALL_TRAMP_ADDR(_name), 1288 1289 #define __BPF_DISPATCHER_SC(name) \ 1290 DEFINE_STATIC_CALL(bpf_dispatcher_##name##_call, bpf_dispatcher_nop_func) 1291 1292 #define __BPF_DISPATCHER_CALL(name) \ 1293 static_call(bpf_dispatcher_##name##_call)(ctx, insnsi, bpf_func) 1294 1295 #define __BPF_DISPATCHER_UPDATE(_d, _new) \ 1296 __static_call_update((_d)->sc_key, (_d)->sc_tramp, (_new)) 1297 1298 #else 1299 #define __BPF_DISPATCHER_SC_INIT(name) 1300 #define __BPF_DISPATCHER_SC(name) 1301 #define __BPF_DISPATCHER_CALL(name) bpf_func(ctx, insnsi) 1302 #define __BPF_DISPATCHER_UPDATE(_d, _new) 1303 #endif 1304 1305 #define BPF_DISPATCHER_INIT(_name) { \ 1306 .mutex = __MUTEX_INITIALIZER(_name.mutex), \ 1307 .func = &_name##_func, \ 1308 .progs = {}, \ 1309 .num_progs = 0, \ 1310 .image = NULL, \ 1311 .image_off = 0, \ 1312 .ksym = { \ 1313 .name = #_name, \ 1314 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \ 1315 }, \ 1316 __BPF_DISPATCHER_SC_INIT(_name##_call) \ 1317 } 1318 1319 #define DEFINE_BPF_DISPATCHER(name) \ 1320 __BPF_DISPATCHER_SC(name); \ 1321 noinline __bpfcall unsigned int bpf_dispatcher_##name##_func( \ 1322 const void *ctx, \ 1323 const struct bpf_insn *insnsi, \ 1324 bpf_func_t bpf_func) \ 1325 { \ 1326 return __BPF_DISPATCHER_CALL(name); \ 1327 } \ 1328 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \ 1329 struct bpf_dispatcher bpf_dispatcher_##name = \ 1330 BPF_DISPATCHER_INIT(bpf_dispatcher_##name); 1331 1332 #define DECLARE_BPF_DISPATCHER(name) \ 1333 unsigned int bpf_dispatcher_##name##_func( \ 1334 const void *ctx, \ 1335 const struct bpf_insn *insnsi, \ 1336 bpf_func_t bpf_func); \ 1337 extern struct bpf_dispatcher bpf_dispatcher_##name; 1338 1339 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func 1340 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name) 1341 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from, 1342 struct bpf_prog *to); 1343 /* Called only from JIT-enabled code, so there's no need for stubs. */ 1344 void bpf_image_ksym_add(void *data, unsigned int size, struct bpf_ksym *ksym); 1345 void bpf_image_ksym_del(struct bpf_ksym *ksym); 1346 void bpf_ksym_add(struct bpf_ksym *ksym); 1347 void bpf_ksym_del(struct bpf_ksym *ksym); 1348 int bpf_jit_charge_modmem(u32 size); 1349 void bpf_jit_uncharge_modmem(u32 size); 1350 bool bpf_prog_has_trampoline(const struct bpf_prog *prog); 1351 #else 1352 static inline int bpf_trampoline_link_prog(struct bpf_tramp_link *link, 1353 struct bpf_trampoline *tr) 1354 { 1355 return -ENOTSUPP; 1356 } 1357 static inline int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link, 1358 struct bpf_trampoline *tr) 1359 { 1360 return -ENOTSUPP; 1361 } 1362 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key, 1363 struct bpf_attach_target_info *tgt_info) 1364 { 1365 return NULL; 1366 } 1367 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {} 1368 #define DEFINE_BPF_DISPATCHER(name) 1369 #define DECLARE_BPF_DISPATCHER(name) 1370 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func 1371 #define BPF_DISPATCHER_PTR(name) NULL 1372 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, 1373 struct bpf_prog *from, 1374 struct bpf_prog *to) {} 1375 static inline bool is_bpf_image_address(unsigned long address) 1376 { 1377 return false; 1378 } 1379 static inline bool bpf_prog_has_trampoline(const struct bpf_prog *prog) 1380 { 1381 return false; 1382 } 1383 #endif 1384 1385 struct bpf_func_info_aux { 1386 u16 linkage; 1387 bool unreliable; 1388 bool called : 1; 1389 bool verified : 1; 1390 }; 1391 1392 enum bpf_jit_poke_reason { 1393 BPF_POKE_REASON_TAIL_CALL, 1394 }; 1395 1396 /* Descriptor of pokes pointing /into/ the JITed image. */ 1397 struct bpf_jit_poke_descriptor { 1398 void *tailcall_target; 1399 void *tailcall_bypass; 1400 void *bypass_addr; 1401 void *aux; 1402 union { 1403 struct { 1404 struct bpf_map *map; 1405 u32 key; 1406 } tail_call; 1407 }; 1408 bool tailcall_target_stable; 1409 u8 adj_off; 1410 u16 reason; 1411 u32 insn_idx; 1412 }; 1413 1414 /* reg_type info for ctx arguments */ 1415 struct bpf_ctx_arg_aux { 1416 u32 offset; 1417 enum bpf_reg_type reg_type; 1418 struct btf *btf; 1419 u32 btf_id; 1420 }; 1421 1422 struct btf_mod_pair { 1423 struct btf *btf; 1424 struct module *module; 1425 }; 1426 1427 struct bpf_kfunc_desc_tab; 1428 1429 struct bpf_prog_aux { 1430 atomic64_t refcnt; 1431 u32 used_map_cnt; 1432 u32 used_btf_cnt; 1433 u32 max_ctx_offset; 1434 u32 max_pkt_offset; 1435 u32 max_tp_access; 1436 u32 stack_depth; 1437 u32 id; 1438 u32 func_cnt; /* used by non-func prog as the number of func progs */ 1439 u32 real_func_cnt; /* includes hidden progs, only used for JIT and freeing progs */ 1440 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */ 1441 u32 attach_btf_id; /* in-kernel BTF type id to attach to */ 1442 u32 ctx_arg_info_size; 1443 u32 max_rdonly_access; 1444 u32 max_rdwr_access; 1445 struct btf *attach_btf; 1446 const struct bpf_ctx_arg_aux *ctx_arg_info; 1447 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */ 1448 struct bpf_prog *dst_prog; 1449 struct bpf_trampoline *dst_trampoline; 1450 enum bpf_prog_type saved_dst_prog_type; 1451 enum bpf_attach_type saved_dst_attach_type; 1452 bool verifier_zext; /* Zero extensions has been inserted by verifier. */ 1453 bool dev_bound; /* Program is bound to the netdev. */ 1454 bool offload_requested; /* Program is bound and offloaded to the netdev. */ 1455 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */ 1456 bool attach_tracing_prog; /* true if tracing another tracing program */ 1457 bool func_proto_unreliable; 1458 bool tail_call_reachable; 1459 bool xdp_has_frags; 1460 bool exception_cb; 1461 bool exception_boundary; 1462 struct bpf_arena *arena; 1463 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */ 1464 const struct btf_type *attach_func_proto; 1465 /* function name for valid attach_btf_id */ 1466 const char *attach_func_name; 1467 struct bpf_prog **func; 1468 void *jit_data; /* JIT specific data. arch dependent */ 1469 struct bpf_jit_poke_descriptor *poke_tab; 1470 struct bpf_kfunc_desc_tab *kfunc_tab; 1471 struct bpf_kfunc_btf_tab *kfunc_btf_tab; 1472 u32 size_poke_tab; 1473 #ifdef CONFIG_FINEIBT 1474 struct bpf_ksym ksym_prefix; 1475 #endif 1476 struct bpf_ksym ksym; 1477 const struct bpf_prog_ops *ops; 1478 struct bpf_map **used_maps; 1479 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */ 1480 struct btf_mod_pair *used_btfs; 1481 struct bpf_prog *prog; 1482 struct user_struct *user; 1483 u64 load_time; /* ns since boottime */ 1484 u32 verified_insns; 1485 int cgroup_atype; /* enum cgroup_bpf_attach_type */ 1486 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]; 1487 char name[BPF_OBJ_NAME_LEN]; 1488 u64 (*bpf_exception_cb)(u64 cookie, u64 sp, u64 bp, u64, u64); 1489 #ifdef CONFIG_SECURITY 1490 void *security; 1491 #endif 1492 struct bpf_token *token; 1493 struct bpf_prog_offload *offload; 1494 struct btf *btf; 1495 struct bpf_func_info *func_info; 1496 struct bpf_func_info_aux *func_info_aux; 1497 /* bpf_line_info loaded from userspace. linfo->insn_off 1498 * has the xlated insn offset. 1499 * Both the main and sub prog share the same linfo. 1500 * The subprog can access its first linfo by 1501 * using the linfo_idx. 1502 */ 1503 struct bpf_line_info *linfo; 1504 /* jited_linfo is the jited addr of the linfo. It has a 1505 * one to one mapping to linfo: 1506 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off. 1507 * Both the main and sub prog share the same jited_linfo. 1508 * The subprog can access its first jited_linfo by 1509 * using the linfo_idx. 1510 */ 1511 void **jited_linfo; 1512 u32 func_info_cnt; 1513 u32 nr_linfo; 1514 /* subprog can use linfo_idx to access its first linfo and 1515 * jited_linfo. 1516 * main prog always has linfo_idx == 0 1517 */ 1518 u32 linfo_idx; 1519 struct module *mod; 1520 u32 num_exentries; 1521 struct exception_table_entry *extable; 1522 union { 1523 struct work_struct work; 1524 struct rcu_head rcu; 1525 }; 1526 }; 1527 1528 struct bpf_prog { 1529 u16 pages; /* Number of allocated pages */ 1530 u16 jited:1, /* Is our filter JIT'ed? */ 1531 jit_requested:1,/* archs need to JIT the prog */ 1532 gpl_compatible:1, /* Is filter GPL compatible? */ 1533 cb_access:1, /* Is control block accessed? */ 1534 dst_needed:1, /* Do we need dst entry? */ 1535 blinding_requested:1, /* needs constant blinding */ 1536 blinded:1, /* Was blinded */ 1537 is_func:1, /* program is a bpf function */ 1538 kprobe_override:1, /* Do we override a kprobe? */ 1539 has_callchain_buf:1, /* callchain buffer allocated? */ 1540 enforce_expected_attach_type:1, /* Enforce expected_attach_type checking at attach time */ 1541 call_get_stack:1, /* Do we call bpf_get_stack() or bpf_get_stackid() */ 1542 call_get_func_ip:1, /* Do we call get_func_ip() */ 1543 tstamp_type_access:1, /* Accessed __sk_buff->tstamp_type */ 1544 sleepable:1; /* BPF program is sleepable */ 1545 enum bpf_prog_type type; /* Type of BPF program */ 1546 enum bpf_attach_type expected_attach_type; /* For some prog types */ 1547 u32 len; /* Number of filter blocks */ 1548 u32 jited_len; /* Size of jited insns in bytes */ 1549 u8 tag[BPF_TAG_SIZE]; 1550 struct bpf_prog_stats __percpu *stats; 1551 int __percpu *active; 1552 unsigned int (*bpf_func)(const void *ctx, 1553 const struct bpf_insn *insn); 1554 struct bpf_prog_aux *aux; /* Auxiliary fields */ 1555 struct sock_fprog_kern *orig_prog; /* Original BPF program */ 1556 /* Instructions for interpreter */ 1557 union { 1558 DECLARE_FLEX_ARRAY(struct sock_filter, insns); 1559 DECLARE_FLEX_ARRAY(struct bpf_insn, insnsi); 1560 }; 1561 }; 1562 1563 struct bpf_array_aux { 1564 /* Programs with direct jumps into programs part of this array. */ 1565 struct list_head poke_progs; 1566 struct bpf_map *map; 1567 struct mutex poke_mutex; 1568 struct work_struct work; 1569 }; 1570 1571 struct bpf_link { 1572 atomic64_t refcnt; 1573 u32 id; 1574 enum bpf_link_type type; 1575 const struct bpf_link_ops *ops; 1576 struct bpf_prog *prog; 1577 /* rcu is used before freeing, work can be used to schedule that 1578 * RCU-based freeing before that, so they never overlap 1579 */ 1580 union { 1581 struct rcu_head rcu; 1582 struct work_struct work; 1583 }; 1584 }; 1585 1586 struct bpf_link_ops { 1587 void (*release)(struct bpf_link *link); 1588 /* deallocate link resources callback, called without RCU grace period 1589 * waiting 1590 */ 1591 void (*dealloc)(struct bpf_link *link); 1592 /* deallocate link resources callback, called after RCU grace period; 1593 * if underlying BPF program is sleepable we go through tasks trace 1594 * RCU GP and then "classic" RCU GP 1595 */ 1596 void (*dealloc_deferred)(struct bpf_link *link); 1597 int (*detach)(struct bpf_link *link); 1598 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog, 1599 struct bpf_prog *old_prog); 1600 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq); 1601 int (*fill_link_info)(const struct bpf_link *link, 1602 struct bpf_link_info *info); 1603 int (*update_map)(struct bpf_link *link, struct bpf_map *new_map, 1604 struct bpf_map *old_map); 1605 }; 1606 1607 struct bpf_tramp_link { 1608 struct bpf_link link; 1609 struct hlist_node tramp_hlist; 1610 u64 cookie; 1611 }; 1612 1613 struct bpf_shim_tramp_link { 1614 struct bpf_tramp_link link; 1615 struct bpf_trampoline *trampoline; 1616 }; 1617 1618 struct bpf_tracing_link { 1619 struct bpf_tramp_link link; 1620 enum bpf_attach_type attach_type; 1621 struct bpf_trampoline *trampoline; 1622 struct bpf_prog *tgt_prog; 1623 }; 1624 1625 struct bpf_link_primer { 1626 struct bpf_link *link; 1627 struct file *file; 1628 int fd; 1629 u32 id; 1630 }; 1631 1632 struct bpf_mount_opts { 1633 kuid_t uid; 1634 kgid_t gid; 1635 umode_t mode; 1636 1637 /* BPF token-related delegation options */ 1638 u64 delegate_cmds; 1639 u64 delegate_maps; 1640 u64 delegate_progs; 1641 u64 delegate_attachs; 1642 }; 1643 1644 struct bpf_token { 1645 struct work_struct work; 1646 atomic64_t refcnt; 1647 struct user_namespace *userns; 1648 u64 allowed_cmds; 1649 u64 allowed_maps; 1650 u64 allowed_progs; 1651 u64 allowed_attachs; 1652 #ifdef CONFIG_SECURITY 1653 void *security; 1654 #endif 1655 }; 1656 1657 struct bpf_struct_ops_value; 1658 struct btf_member; 1659 1660 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64 1661 /** 1662 * struct bpf_struct_ops - A structure of callbacks allowing a subsystem to 1663 * define a BPF_MAP_TYPE_STRUCT_OPS map type composed 1664 * of BPF_PROG_TYPE_STRUCT_OPS progs. 1665 * @verifier_ops: A structure of callbacks that are invoked by the verifier 1666 * when determining whether the struct_ops progs in the 1667 * struct_ops map are valid. 1668 * @init: A callback that is invoked a single time, and before any other 1669 * callback, to initialize the structure. A nonzero return value means 1670 * the subsystem could not be initialized. 1671 * @check_member: When defined, a callback invoked by the verifier to allow 1672 * the subsystem to determine if an entry in the struct_ops map 1673 * is valid. A nonzero return value means that the map is 1674 * invalid and should be rejected by the verifier. 1675 * @init_member: A callback that is invoked for each member of the struct_ops 1676 * map to allow the subsystem to initialize the member. A nonzero 1677 * value means the member could not be initialized. This callback 1678 * is exclusive with the @type, @type_id, @value_type, and 1679 * @value_id fields. 1680 * @reg: A callback that is invoked when the struct_ops map has been 1681 * initialized and is being attached to. Zero means the struct_ops map 1682 * has been successfully registered and is live. A nonzero return value 1683 * means the struct_ops map could not be registered. 1684 * @unreg: A callback that is invoked when the struct_ops map should be 1685 * unregistered. 1686 * @update: A callback that is invoked when the live struct_ops map is being 1687 * updated to contain new values. This callback is only invoked when 1688 * the struct_ops map is loaded with BPF_F_LINK. If not defined, the 1689 * it is assumed that the struct_ops map cannot be updated. 1690 * @validate: A callback that is invoked after all of the members have been 1691 * initialized. This callback should perform static checks on the 1692 * map, meaning that it should either fail or succeed 1693 * deterministically. A struct_ops map that has been validated may 1694 * not necessarily succeed in being registered if the call to @reg 1695 * fails. For example, a valid struct_ops map may be loaded, but 1696 * then fail to be registered due to there being another active 1697 * struct_ops map on the system in the subsystem already. For this 1698 * reason, if this callback is not defined, the check is skipped as 1699 * the struct_ops map will have final verification performed in 1700 * @reg. 1701 * @type: BTF type. 1702 * @value_type: Value type. 1703 * @name: The name of the struct bpf_struct_ops object. 1704 * @func_models: Func models 1705 * @type_id: BTF type id. 1706 * @value_id: BTF value id. 1707 */ 1708 struct bpf_struct_ops { 1709 const struct bpf_verifier_ops *verifier_ops; 1710 int (*init)(struct btf *btf); 1711 int (*check_member)(const struct btf_type *t, 1712 const struct btf_member *member, 1713 const struct bpf_prog *prog); 1714 int (*init_member)(const struct btf_type *t, 1715 const struct btf_member *member, 1716 void *kdata, const void *udata); 1717 int (*reg)(void *kdata); 1718 void (*unreg)(void *kdata); 1719 int (*update)(void *kdata, void *old_kdata); 1720 int (*validate)(void *kdata); 1721 void *cfi_stubs; 1722 struct module *owner; 1723 const char *name; 1724 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS]; 1725 }; 1726 1727 /* Every member of a struct_ops type has an instance even a member is not 1728 * an operator (function pointer). The "info" field will be assigned to 1729 * prog->aux->ctx_arg_info of BPF struct_ops programs to provide the 1730 * argument information required by the verifier to verify the program. 1731 * 1732 * btf_ctx_access() will lookup prog->aux->ctx_arg_info to find the 1733 * corresponding entry for an given argument. 1734 */ 1735 struct bpf_struct_ops_arg_info { 1736 struct bpf_ctx_arg_aux *info; 1737 u32 cnt; 1738 }; 1739 1740 struct bpf_struct_ops_desc { 1741 struct bpf_struct_ops *st_ops; 1742 1743 const struct btf_type *type; 1744 const struct btf_type *value_type; 1745 u32 type_id; 1746 u32 value_id; 1747 1748 /* Collection of argument information for each member */ 1749 struct bpf_struct_ops_arg_info *arg_info; 1750 }; 1751 1752 enum bpf_struct_ops_state { 1753 BPF_STRUCT_OPS_STATE_INIT, 1754 BPF_STRUCT_OPS_STATE_INUSE, 1755 BPF_STRUCT_OPS_STATE_TOBEFREE, 1756 BPF_STRUCT_OPS_STATE_READY, 1757 }; 1758 1759 struct bpf_struct_ops_common_value { 1760 refcount_t refcnt; 1761 enum bpf_struct_ops_state state; 1762 }; 1763 1764 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL) 1765 /* This macro helps developer to register a struct_ops type and generate 1766 * type information correctly. Developers should use this macro to register 1767 * a struct_ops type instead of calling __register_bpf_struct_ops() directly. 1768 */ 1769 #define register_bpf_struct_ops(st_ops, type) \ 1770 ({ \ 1771 struct bpf_struct_ops_##type { \ 1772 struct bpf_struct_ops_common_value common; \ 1773 struct type data ____cacheline_aligned_in_smp; \ 1774 }; \ 1775 BTF_TYPE_EMIT(struct bpf_struct_ops_##type); \ 1776 __register_bpf_struct_ops(st_ops); \ 1777 }) 1778 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA)) 1779 bool bpf_struct_ops_get(const void *kdata); 1780 void bpf_struct_ops_put(const void *kdata); 1781 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key, 1782 void *value); 1783 int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_links *tlinks, 1784 struct bpf_tramp_link *link, 1785 const struct btf_func_model *model, 1786 void *stub_func, 1787 void **image, u32 *image_off, 1788 bool allow_alloc); 1789 void bpf_struct_ops_image_free(void *image); 1790 static inline bool bpf_try_module_get(const void *data, struct module *owner) 1791 { 1792 if (owner == BPF_MODULE_OWNER) 1793 return bpf_struct_ops_get(data); 1794 else 1795 return try_module_get(owner); 1796 } 1797 static inline void bpf_module_put(const void *data, struct module *owner) 1798 { 1799 if (owner == BPF_MODULE_OWNER) 1800 bpf_struct_ops_put(data); 1801 else 1802 module_put(owner); 1803 } 1804 int bpf_struct_ops_link_create(union bpf_attr *attr); 1805 1806 #ifdef CONFIG_NET 1807 /* Define it here to avoid the use of forward declaration */ 1808 struct bpf_dummy_ops_state { 1809 int val; 1810 }; 1811 1812 struct bpf_dummy_ops { 1813 int (*test_1)(struct bpf_dummy_ops_state *cb); 1814 int (*test_2)(struct bpf_dummy_ops_state *cb, int a1, unsigned short a2, 1815 char a3, unsigned long a4); 1816 int (*test_sleepable)(struct bpf_dummy_ops_state *cb); 1817 }; 1818 1819 int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr, 1820 union bpf_attr __user *uattr); 1821 #endif 1822 int bpf_struct_ops_desc_init(struct bpf_struct_ops_desc *st_ops_desc, 1823 struct btf *btf, 1824 struct bpf_verifier_log *log); 1825 void bpf_map_struct_ops_info_fill(struct bpf_map_info *info, struct bpf_map *map); 1826 void bpf_struct_ops_desc_release(struct bpf_struct_ops_desc *st_ops_desc); 1827 #else 1828 #define register_bpf_struct_ops(st_ops, type) ({ (void *)(st_ops); 0; }) 1829 static inline bool bpf_try_module_get(const void *data, struct module *owner) 1830 { 1831 return try_module_get(owner); 1832 } 1833 static inline void bpf_module_put(const void *data, struct module *owner) 1834 { 1835 module_put(owner); 1836 } 1837 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, 1838 void *key, 1839 void *value) 1840 { 1841 return -EINVAL; 1842 } 1843 static inline int bpf_struct_ops_link_create(union bpf_attr *attr) 1844 { 1845 return -EOPNOTSUPP; 1846 } 1847 static inline void bpf_map_struct_ops_info_fill(struct bpf_map_info *info, struct bpf_map *map) 1848 { 1849 } 1850 1851 static inline void bpf_struct_ops_desc_release(struct bpf_struct_ops_desc *st_ops_desc) 1852 { 1853 } 1854 1855 #endif 1856 1857 #if defined(CONFIG_CGROUP_BPF) && defined(CONFIG_BPF_LSM) 1858 int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog, 1859 int cgroup_atype); 1860 void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog); 1861 #else 1862 static inline int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog, 1863 int cgroup_atype) 1864 { 1865 return -EOPNOTSUPP; 1866 } 1867 static inline void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog) 1868 { 1869 } 1870 #endif 1871 1872 struct bpf_array { 1873 struct bpf_map map; 1874 u32 elem_size; 1875 u32 index_mask; 1876 struct bpf_array_aux *aux; 1877 union { 1878 DECLARE_FLEX_ARRAY(char, value) __aligned(8); 1879 DECLARE_FLEX_ARRAY(void *, ptrs) __aligned(8); 1880 DECLARE_FLEX_ARRAY(void __percpu *, pptrs) __aligned(8); 1881 }; 1882 }; 1883 1884 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */ 1885 #define MAX_TAIL_CALL_CNT 33 1886 1887 /* Maximum number of loops for bpf_loop and bpf_iter_num. 1888 * It's enum to expose it (and thus make it discoverable) through BTF. 1889 */ 1890 enum { 1891 BPF_MAX_LOOPS = 8 * 1024 * 1024, 1892 }; 1893 1894 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \ 1895 BPF_F_RDONLY_PROG | \ 1896 BPF_F_WRONLY | \ 1897 BPF_F_WRONLY_PROG) 1898 1899 #define BPF_MAP_CAN_READ BIT(0) 1900 #define BPF_MAP_CAN_WRITE BIT(1) 1901 1902 /* Maximum number of user-producer ring buffer samples that can be drained in 1903 * a call to bpf_user_ringbuf_drain(). 1904 */ 1905 #define BPF_MAX_USER_RINGBUF_SAMPLES (128 * 1024) 1906 1907 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map) 1908 { 1909 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG); 1910 1911 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is 1912 * not possible. 1913 */ 1914 if (access_flags & BPF_F_RDONLY_PROG) 1915 return BPF_MAP_CAN_READ; 1916 else if (access_flags & BPF_F_WRONLY_PROG) 1917 return BPF_MAP_CAN_WRITE; 1918 else 1919 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE; 1920 } 1921 1922 static inline bool bpf_map_flags_access_ok(u32 access_flags) 1923 { 1924 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) != 1925 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG); 1926 } 1927 1928 struct bpf_event_entry { 1929 struct perf_event *event; 1930 struct file *perf_file; 1931 struct file *map_file; 1932 struct rcu_head rcu; 1933 }; 1934 1935 static inline bool map_type_contains_progs(struct bpf_map *map) 1936 { 1937 return map->map_type == BPF_MAP_TYPE_PROG_ARRAY || 1938 map->map_type == BPF_MAP_TYPE_DEVMAP || 1939 map->map_type == BPF_MAP_TYPE_CPUMAP; 1940 } 1941 1942 bool bpf_prog_map_compatible(struct bpf_map *map, const struct bpf_prog *fp); 1943 int bpf_prog_calc_tag(struct bpf_prog *fp); 1944 1945 const struct bpf_func_proto *bpf_get_trace_printk_proto(void); 1946 const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void); 1947 1948 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src, 1949 unsigned long off, unsigned long len); 1950 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type, 1951 const struct bpf_insn *src, 1952 struct bpf_insn *dst, 1953 struct bpf_prog *prog, 1954 u32 *target_size); 1955 1956 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, 1957 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy); 1958 1959 /* an array of programs to be executed under rcu_lock. 1960 * 1961 * Typical usage: 1962 * ret = bpf_prog_run_array(rcu_dereference(&bpf_prog_array), ctx, bpf_prog_run); 1963 * 1964 * the structure returned by bpf_prog_array_alloc() should be populated 1965 * with program pointers and the last pointer must be NULL. 1966 * The user has to keep refcnt on the program and make sure the program 1967 * is removed from the array before bpf_prog_put(). 1968 * The 'struct bpf_prog_array *' should only be replaced with xchg() 1969 * since other cpus are walking the array of pointers in parallel. 1970 */ 1971 struct bpf_prog_array_item { 1972 struct bpf_prog *prog; 1973 union { 1974 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]; 1975 u64 bpf_cookie; 1976 }; 1977 }; 1978 1979 struct bpf_prog_array { 1980 struct rcu_head rcu; 1981 struct bpf_prog_array_item items[]; 1982 }; 1983 1984 struct bpf_empty_prog_array { 1985 struct bpf_prog_array hdr; 1986 struct bpf_prog *null_prog; 1987 }; 1988 1989 /* to avoid allocating empty bpf_prog_array for cgroups that 1990 * don't have bpf program attached use one global 'bpf_empty_prog_array' 1991 * It will not be modified the caller of bpf_prog_array_alloc() 1992 * (since caller requested prog_cnt == 0) 1993 * that pointer should be 'freed' by bpf_prog_array_free() 1994 */ 1995 extern struct bpf_empty_prog_array bpf_empty_prog_array; 1996 1997 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags); 1998 void bpf_prog_array_free(struct bpf_prog_array *progs); 1999 /* Use when traversal over the bpf_prog_array uses tasks_trace rcu */ 2000 void bpf_prog_array_free_sleepable(struct bpf_prog_array *progs); 2001 int bpf_prog_array_length(struct bpf_prog_array *progs); 2002 bool bpf_prog_array_is_empty(struct bpf_prog_array *array); 2003 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs, 2004 __u32 __user *prog_ids, u32 cnt); 2005 2006 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs, 2007 struct bpf_prog *old_prog); 2008 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index); 2009 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index, 2010 struct bpf_prog *prog); 2011 int bpf_prog_array_copy_info(struct bpf_prog_array *array, 2012 u32 *prog_ids, u32 request_cnt, 2013 u32 *prog_cnt); 2014 int bpf_prog_array_copy(struct bpf_prog_array *old_array, 2015 struct bpf_prog *exclude_prog, 2016 struct bpf_prog *include_prog, 2017 u64 bpf_cookie, 2018 struct bpf_prog_array **new_array); 2019 2020 struct bpf_run_ctx {}; 2021 2022 struct bpf_cg_run_ctx { 2023 struct bpf_run_ctx run_ctx; 2024 const struct bpf_prog_array_item *prog_item; 2025 int retval; 2026 }; 2027 2028 struct bpf_trace_run_ctx { 2029 struct bpf_run_ctx run_ctx; 2030 u64 bpf_cookie; 2031 bool is_uprobe; 2032 }; 2033 2034 struct bpf_tramp_run_ctx { 2035 struct bpf_run_ctx run_ctx; 2036 u64 bpf_cookie; 2037 struct bpf_run_ctx *saved_run_ctx; 2038 }; 2039 2040 static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx) 2041 { 2042 struct bpf_run_ctx *old_ctx = NULL; 2043 2044 #ifdef CONFIG_BPF_SYSCALL 2045 old_ctx = current->bpf_ctx; 2046 current->bpf_ctx = new_ctx; 2047 #endif 2048 return old_ctx; 2049 } 2050 2051 static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx) 2052 { 2053 #ifdef CONFIG_BPF_SYSCALL 2054 current->bpf_ctx = old_ctx; 2055 #endif 2056 } 2057 2058 /* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */ 2059 #define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE (1 << 0) 2060 /* BPF program asks to set CN on the packet. */ 2061 #define BPF_RET_SET_CN (1 << 0) 2062 2063 typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx); 2064 2065 static __always_inline u32 2066 bpf_prog_run_array(const struct bpf_prog_array *array, 2067 const void *ctx, bpf_prog_run_fn run_prog) 2068 { 2069 const struct bpf_prog_array_item *item; 2070 const struct bpf_prog *prog; 2071 struct bpf_run_ctx *old_run_ctx; 2072 struct bpf_trace_run_ctx run_ctx; 2073 u32 ret = 1; 2074 2075 RCU_LOCKDEP_WARN(!rcu_read_lock_held(), "no rcu lock held"); 2076 2077 if (unlikely(!array)) 2078 return ret; 2079 2080 run_ctx.is_uprobe = false; 2081 2082 migrate_disable(); 2083 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx); 2084 item = &array->items[0]; 2085 while ((prog = READ_ONCE(item->prog))) { 2086 run_ctx.bpf_cookie = item->bpf_cookie; 2087 ret &= run_prog(prog, ctx); 2088 item++; 2089 } 2090 bpf_reset_run_ctx(old_run_ctx); 2091 migrate_enable(); 2092 return ret; 2093 } 2094 2095 /* Notes on RCU design for bpf_prog_arrays containing sleepable programs: 2096 * 2097 * We use the tasks_trace rcu flavor read section to protect the bpf_prog_array 2098 * overall. As a result, we must use the bpf_prog_array_free_sleepable 2099 * in order to use the tasks_trace rcu grace period. 2100 * 2101 * When a non-sleepable program is inside the array, we take the rcu read 2102 * section and disable preemption for that program alone, so it can access 2103 * rcu-protected dynamically sized maps. 2104 */ 2105 static __always_inline u32 2106 bpf_prog_run_array_uprobe(const struct bpf_prog_array __rcu *array_rcu, 2107 const void *ctx, bpf_prog_run_fn run_prog) 2108 { 2109 const struct bpf_prog_array_item *item; 2110 const struct bpf_prog *prog; 2111 const struct bpf_prog_array *array; 2112 struct bpf_run_ctx *old_run_ctx; 2113 struct bpf_trace_run_ctx run_ctx; 2114 u32 ret = 1; 2115 2116 might_fault(); 2117 2118 rcu_read_lock_trace(); 2119 migrate_disable(); 2120 2121 run_ctx.is_uprobe = true; 2122 2123 array = rcu_dereference_check(array_rcu, rcu_read_lock_trace_held()); 2124 if (unlikely(!array)) 2125 goto out; 2126 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx); 2127 item = &array->items[0]; 2128 while ((prog = READ_ONCE(item->prog))) { 2129 if (!prog->sleepable) 2130 rcu_read_lock(); 2131 2132 run_ctx.bpf_cookie = item->bpf_cookie; 2133 ret &= run_prog(prog, ctx); 2134 item++; 2135 2136 if (!prog->sleepable) 2137 rcu_read_unlock(); 2138 } 2139 bpf_reset_run_ctx(old_run_ctx); 2140 out: 2141 migrate_enable(); 2142 rcu_read_unlock_trace(); 2143 return ret; 2144 } 2145 2146 #ifdef CONFIG_BPF_SYSCALL 2147 DECLARE_PER_CPU(int, bpf_prog_active); 2148 extern struct mutex bpf_stats_enabled_mutex; 2149 2150 /* 2151 * Block execution of BPF programs attached to instrumentation (perf, 2152 * kprobes, tracepoints) to prevent deadlocks on map operations as any of 2153 * these events can happen inside a region which holds a map bucket lock 2154 * and can deadlock on it. 2155 */ 2156 static inline void bpf_disable_instrumentation(void) 2157 { 2158 migrate_disable(); 2159 this_cpu_inc(bpf_prog_active); 2160 } 2161 2162 static inline void bpf_enable_instrumentation(void) 2163 { 2164 this_cpu_dec(bpf_prog_active); 2165 migrate_enable(); 2166 } 2167 2168 extern const struct super_operations bpf_super_ops; 2169 extern const struct file_operations bpf_map_fops; 2170 extern const struct file_operations bpf_prog_fops; 2171 extern const struct file_operations bpf_iter_fops; 2172 2173 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \ 2174 extern const struct bpf_prog_ops _name ## _prog_ops; \ 2175 extern const struct bpf_verifier_ops _name ## _verifier_ops; 2176 #define BPF_MAP_TYPE(_id, _ops) \ 2177 extern const struct bpf_map_ops _ops; 2178 #define BPF_LINK_TYPE(_id, _name) 2179 #include <linux/bpf_types.h> 2180 #undef BPF_PROG_TYPE 2181 #undef BPF_MAP_TYPE 2182 #undef BPF_LINK_TYPE 2183 2184 extern const struct bpf_prog_ops bpf_offload_prog_ops; 2185 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops; 2186 extern const struct bpf_verifier_ops xdp_analyzer_ops; 2187 2188 struct bpf_prog *bpf_prog_get(u32 ufd); 2189 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, 2190 bool attach_drv); 2191 void bpf_prog_add(struct bpf_prog *prog, int i); 2192 void bpf_prog_sub(struct bpf_prog *prog, int i); 2193 void bpf_prog_inc(struct bpf_prog *prog); 2194 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog); 2195 void bpf_prog_put(struct bpf_prog *prog); 2196 2197 void bpf_prog_free_id(struct bpf_prog *prog); 2198 void bpf_map_free_id(struct bpf_map *map); 2199 2200 struct btf_field *btf_record_find(const struct btf_record *rec, 2201 u32 offset, u32 field_mask); 2202 void btf_record_free(struct btf_record *rec); 2203 void bpf_map_free_record(struct bpf_map *map); 2204 struct btf_record *btf_record_dup(const struct btf_record *rec); 2205 bool btf_record_equal(const struct btf_record *rec_a, const struct btf_record *rec_b); 2206 void bpf_obj_free_timer(const struct btf_record *rec, void *obj); 2207 void bpf_obj_free_fields(const struct btf_record *rec, void *obj); 2208 void __bpf_obj_drop_impl(void *p, const struct btf_record *rec, bool percpu); 2209 2210 struct bpf_map *bpf_map_get(u32 ufd); 2211 struct bpf_map *bpf_map_get_with_uref(u32 ufd); 2212 struct bpf_map *__bpf_map_get(struct fd f); 2213 void bpf_map_inc(struct bpf_map *map); 2214 void bpf_map_inc_with_uref(struct bpf_map *map); 2215 struct bpf_map *__bpf_map_inc_not_zero(struct bpf_map *map, bool uref); 2216 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map); 2217 void bpf_map_put_with_uref(struct bpf_map *map); 2218 void bpf_map_put(struct bpf_map *map); 2219 void *bpf_map_area_alloc(u64 size, int numa_node); 2220 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node); 2221 void bpf_map_area_free(void *base); 2222 bool bpf_map_write_active(const struct bpf_map *map); 2223 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr); 2224 int generic_map_lookup_batch(struct bpf_map *map, 2225 const union bpf_attr *attr, 2226 union bpf_attr __user *uattr); 2227 int generic_map_update_batch(struct bpf_map *map, struct file *map_file, 2228 const union bpf_attr *attr, 2229 union bpf_attr __user *uattr); 2230 int generic_map_delete_batch(struct bpf_map *map, 2231 const union bpf_attr *attr, 2232 union bpf_attr __user *uattr); 2233 struct bpf_map *bpf_map_get_curr_or_next(u32 *id); 2234 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id); 2235 2236 int bpf_map_alloc_pages(const struct bpf_map *map, gfp_t gfp, int nid, 2237 unsigned long nr_pages, struct page **page_array); 2238 #ifdef CONFIG_MEMCG_KMEM 2239 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags, 2240 int node); 2241 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags); 2242 void *bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size, 2243 gfp_t flags); 2244 void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, 2245 size_t align, gfp_t flags); 2246 #else 2247 #define bpf_map_kmalloc_node(_map, _size, _flags, _node) \ 2248 kmalloc_node(_size, _flags, _node) 2249 #define bpf_map_kzalloc(_map, _size, _flags) \ 2250 kzalloc(_size, _flags) 2251 #define bpf_map_kvcalloc(_map, _n, _size, _flags) \ 2252 kvcalloc(_n, _size, _flags) 2253 #define bpf_map_alloc_percpu(_map, _size, _align, _flags) \ 2254 __alloc_percpu_gfp(_size, _align, _flags) 2255 #endif 2256 2257 static inline int 2258 bpf_map_init_elem_count(struct bpf_map *map) 2259 { 2260 size_t size = sizeof(*map->elem_count), align = size; 2261 gfp_t flags = GFP_USER | __GFP_NOWARN; 2262 2263 map->elem_count = bpf_map_alloc_percpu(map, size, align, flags); 2264 if (!map->elem_count) 2265 return -ENOMEM; 2266 2267 return 0; 2268 } 2269 2270 static inline void 2271 bpf_map_free_elem_count(struct bpf_map *map) 2272 { 2273 free_percpu(map->elem_count); 2274 } 2275 2276 static inline void bpf_map_inc_elem_count(struct bpf_map *map) 2277 { 2278 this_cpu_inc(*map->elem_count); 2279 } 2280 2281 static inline void bpf_map_dec_elem_count(struct bpf_map *map) 2282 { 2283 this_cpu_dec(*map->elem_count); 2284 } 2285 2286 extern int sysctl_unprivileged_bpf_disabled; 2287 2288 bool bpf_token_capable(const struct bpf_token *token, int cap); 2289 2290 static inline bool bpf_allow_ptr_leaks(const struct bpf_token *token) 2291 { 2292 return bpf_token_capable(token, CAP_PERFMON); 2293 } 2294 2295 static inline bool bpf_allow_uninit_stack(const struct bpf_token *token) 2296 { 2297 return bpf_token_capable(token, CAP_PERFMON); 2298 } 2299 2300 static inline bool bpf_bypass_spec_v1(const struct bpf_token *token) 2301 { 2302 return cpu_mitigations_off() || bpf_token_capable(token, CAP_PERFMON); 2303 } 2304 2305 static inline bool bpf_bypass_spec_v4(const struct bpf_token *token) 2306 { 2307 return cpu_mitigations_off() || bpf_token_capable(token, CAP_PERFMON); 2308 } 2309 2310 int bpf_map_new_fd(struct bpf_map *map, int flags); 2311 int bpf_prog_new_fd(struct bpf_prog *prog); 2312 2313 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type, 2314 const struct bpf_link_ops *ops, struct bpf_prog *prog); 2315 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer); 2316 int bpf_link_settle(struct bpf_link_primer *primer); 2317 void bpf_link_cleanup(struct bpf_link_primer *primer); 2318 void bpf_link_inc(struct bpf_link *link); 2319 void bpf_link_put(struct bpf_link *link); 2320 int bpf_link_new_fd(struct bpf_link *link); 2321 struct bpf_link *bpf_link_get_from_fd(u32 ufd); 2322 struct bpf_link *bpf_link_get_curr_or_next(u32 *id); 2323 2324 void bpf_token_inc(struct bpf_token *token); 2325 void bpf_token_put(struct bpf_token *token); 2326 int bpf_token_create(union bpf_attr *attr); 2327 struct bpf_token *bpf_token_get_from_fd(u32 ufd); 2328 2329 bool bpf_token_allow_cmd(const struct bpf_token *token, enum bpf_cmd cmd); 2330 bool bpf_token_allow_map_type(const struct bpf_token *token, enum bpf_map_type type); 2331 bool bpf_token_allow_prog_type(const struct bpf_token *token, 2332 enum bpf_prog_type prog_type, 2333 enum bpf_attach_type attach_type); 2334 2335 int bpf_obj_pin_user(u32 ufd, int path_fd, const char __user *pathname); 2336 int bpf_obj_get_user(int path_fd, const char __user *pathname, int flags); 2337 struct inode *bpf_get_inode(struct super_block *sb, const struct inode *dir, 2338 umode_t mode); 2339 2340 #define BPF_ITER_FUNC_PREFIX "bpf_iter_" 2341 #define DEFINE_BPF_ITER_FUNC(target, args...) \ 2342 extern int bpf_iter_ ## target(args); \ 2343 int __init bpf_iter_ ## target(args) { return 0; } 2344 2345 /* 2346 * The task type of iterators. 2347 * 2348 * For BPF task iterators, they can be parameterized with various 2349 * parameters to visit only some of tasks. 2350 * 2351 * BPF_TASK_ITER_ALL (default) 2352 * Iterate over resources of every task. 2353 * 2354 * BPF_TASK_ITER_TID 2355 * Iterate over resources of a task/tid. 2356 * 2357 * BPF_TASK_ITER_TGID 2358 * Iterate over resources of every task of a process / task group. 2359 */ 2360 enum bpf_iter_task_type { 2361 BPF_TASK_ITER_ALL = 0, 2362 BPF_TASK_ITER_TID, 2363 BPF_TASK_ITER_TGID, 2364 }; 2365 2366 struct bpf_iter_aux_info { 2367 /* for map_elem iter */ 2368 struct bpf_map *map; 2369 2370 /* for cgroup iter */ 2371 struct { 2372 struct cgroup *start; /* starting cgroup */ 2373 enum bpf_cgroup_iter_order order; 2374 } cgroup; 2375 struct { 2376 enum bpf_iter_task_type type; 2377 u32 pid; 2378 } task; 2379 }; 2380 2381 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog, 2382 union bpf_iter_link_info *linfo, 2383 struct bpf_iter_aux_info *aux); 2384 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux); 2385 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux, 2386 struct seq_file *seq); 2387 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux, 2388 struct bpf_link_info *info); 2389 typedef const struct bpf_func_proto * 2390 (*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id, 2391 const struct bpf_prog *prog); 2392 2393 enum bpf_iter_feature { 2394 BPF_ITER_RESCHED = BIT(0), 2395 }; 2396 2397 #define BPF_ITER_CTX_ARG_MAX 2 2398 struct bpf_iter_reg { 2399 const char *target; 2400 bpf_iter_attach_target_t attach_target; 2401 bpf_iter_detach_target_t detach_target; 2402 bpf_iter_show_fdinfo_t show_fdinfo; 2403 bpf_iter_fill_link_info_t fill_link_info; 2404 bpf_iter_get_func_proto_t get_func_proto; 2405 u32 ctx_arg_info_size; 2406 u32 feature; 2407 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX]; 2408 const struct bpf_iter_seq_info *seq_info; 2409 }; 2410 2411 struct bpf_iter_meta { 2412 __bpf_md_ptr(struct seq_file *, seq); 2413 u64 session_id; 2414 u64 seq_num; 2415 }; 2416 2417 struct bpf_iter__bpf_map_elem { 2418 __bpf_md_ptr(struct bpf_iter_meta *, meta); 2419 __bpf_md_ptr(struct bpf_map *, map); 2420 __bpf_md_ptr(void *, key); 2421 __bpf_md_ptr(void *, value); 2422 }; 2423 2424 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info); 2425 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info); 2426 bool bpf_iter_prog_supported(struct bpf_prog *prog); 2427 const struct bpf_func_proto * 2428 bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog); 2429 int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog); 2430 int bpf_iter_new_fd(struct bpf_link *link); 2431 bool bpf_link_is_iter(struct bpf_link *link); 2432 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop); 2433 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx); 2434 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux, 2435 struct seq_file *seq); 2436 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux, 2437 struct bpf_link_info *info); 2438 2439 int map_set_for_each_callback_args(struct bpf_verifier_env *env, 2440 struct bpf_func_state *caller, 2441 struct bpf_func_state *callee); 2442 2443 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value); 2444 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value); 2445 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value, 2446 u64 flags); 2447 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value, 2448 u64 flags); 2449 2450 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value); 2451 2452 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file, 2453 void *key, void *value, u64 map_flags); 2454 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 2455 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file, 2456 void *key, void *value, u64 map_flags); 2457 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 2458 2459 int bpf_get_file_flag(int flags); 2460 int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size, 2461 size_t actual_size); 2462 2463 /* verify correctness of eBPF program */ 2464 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr, u32 uattr_size); 2465 2466 #ifndef CONFIG_BPF_JIT_ALWAYS_ON 2467 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth); 2468 #endif 2469 2470 struct btf *bpf_get_btf_vmlinux(void); 2471 2472 /* Map specifics */ 2473 struct xdp_frame; 2474 struct sk_buff; 2475 struct bpf_dtab_netdev; 2476 struct bpf_cpu_map_entry; 2477 2478 void __dev_flush(void); 2479 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf, 2480 struct net_device *dev_rx); 2481 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf, 2482 struct net_device *dev_rx); 2483 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx, 2484 struct bpf_map *map, bool exclude_ingress); 2485 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb, 2486 struct bpf_prog *xdp_prog); 2487 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb, 2488 struct bpf_prog *xdp_prog, struct bpf_map *map, 2489 bool exclude_ingress); 2490 2491 void __cpu_map_flush(void); 2492 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf, 2493 struct net_device *dev_rx); 2494 int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu, 2495 struct sk_buff *skb); 2496 2497 /* Return map's numa specified by userspace */ 2498 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr) 2499 { 2500 return (attr->map_flags & BPF_F_NUMA_NODE) ? 2501 attr->numa_node : NUMA_NO_NODE; 2502 } 2503 2504 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type); 2505 int array_map_alloc_check(union bpf_attr *attr); 2506 2507 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, 2508 union bpf_attr __user *uattr); 2509 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, 2510 union bpf_attr __user *uattr); 2511 int bpf_prog_test_run_tracing(struct bpf_prog *prog, 2512 const union bpf_attr *kattr, 2513 union bpf_attr __user *uattr); 2514 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, 2515 const union bpf_attr *kattr, 2516 union bpf_attr __user *uattr); 2517 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog, 2518 const union bpf_attr *kattr, 2519 union bpf_attr __user *uattr); 2520 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog, 2521 const union bpf_attr *kattr, 2522 union bpf_attr __user *uattr); 2523 int bpf_prog_test_run_nf(struct bpf_prog *prog, 2524 const union bpf_attr *kattr, 2525 union bpf_attr __user *uattr); 2526 bool btf_ctx_access(int off, int size, enum bpf_access_type type, 2527 const struct bpf_prog *prog, 2528 struct bpf_insn_access_aux *info); 2529 2530 static inline bool bpf_tracing_ctx_access(int off, int size, 2531 enum bpf_access_type type) 2532 { 2533 if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS) 2534 return false; 2535 if (type != BPF_READ) 2536 return false; 2537 if (off % size != 0) 2538 return false; 2539 return true; 2540 } 2541 2542 static inline bool bpf_tracing_btf_ctx_access(int off, int size, 2543 enum bpf_access_type type, 2544 const struct bpf_prog *prog, 2545 struct bpf_insn_access_aux *info) 2546 { 2547 if (!bpf_tracing_ctx_access(off, size, type)) 2548 return false; 2549 return btf_ctx_access(off, size, type, prog, info); 2550 } 2551 2552 int btf_struct_access(struct bpf_verifier_log *log, 2553 const struct bpf_reg_state *reg, 2554 int off, int size, enum bpf_access_type atype, 2555 u32 *next_btf_id, enum bpf_type_flag *flag, const char **field_name); 2556 bool btf_struct_ids_match(struct bpf_verifier_log *log, 2557 const struct btf *btf, u32 id, int off, 2558 const struct btf *need_btf, u32 need_type_id, 2559 bool strict); 2560 2561 int btf_distill_func_proto(struct bpf_verifier_log *log, 2562 struct btf *btf, 2563 const struct btf_type *func_proto, 2564 const char *func_name, 2565 struct btf_func_model *m); 2566 2567 struct bpf_reg_state; 2568 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog); 2569 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog, 2570 struct btf *btf, const struct btf_type *t); 2571 const char *btf_find_decl_tag_value(const struct btf *btf, const struct btf_type *pt, 2572 int comp_idx, const char *tag_key); 2573 int btf_find_next_decl_tag(const struct btf *btf, const struct btf_type *pt, 2574 int comp_idx, const char *tag_key, int last_id); 2575 2576 struct bpf_prog *bpf_prog_by_id(u32 id); 2577 struct bpf_link *bpf_link_by_id(u32 id); 2578 2579 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id, 2580 const struct bpf_prog *prog); 2581 void bpf_task_storage_free(struct task_struct *task); 2582 void bpf_cgrp_storage_free(struct cgroup *cgroup); 2583 bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog); 2584 const struct btf_func_model * 2585 bpf_jit_find_kfunc_model(const struct bpf_prog *prog, 2586 const struct bpf_insn *insn); 2587 int bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id, 2588 u16 btf_fd_idx, u8 **func_addr); 2589 2590 struct bpf_core_ctx { 2591 struct bpf_verifier_log *log; 2592 const struct btf *btf; 2593 }; 2594 2595 bool btf_nested_type_is_trusted(struct bpf_verifier_log *log, 2596 const struct bpf_reg_state *reg, 2597 const char *field_name, u32 btf_id, const char *suffix); 2598 2599 bool btf_type_ids_nocast_alias(struct bpf_verifier_log *log, 2600 const struct btf *reg_btf, u32 reg_id, 2601 const struct btf *arg_btf, u32 arg_id); 2602 2603 int bpf_core_apply(struct bpf_core_ctx *ctx, const struct bpf_core_relo *relo, 2604 int relo_idx, void *insn); 2605 2606 static inline bool unprivileged_ebpf_enabled(void) 2607 { 2608 return !sysctl_unprivileged_bpf_disabled; 2609 } 2610 2611 /* Not all bpf prog type has the bpf_ctx. 2612 * For the bpf prog type that has initialized the bpf_ctx, 2613 * this function can be used to decide if a kernel function 2614 * is called by a bpf program. 2615 */ 2616 static inline bool has_current_bpf_ctx(void) 2617 { 2618 return !!current->bpf_ctx; 2619 } 2620 2621 void notrace bpf_prog_inc_misses_counter(struct bpf_prog *prog); 2622 2623 void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data, 2624 enum bpf_dynptr_type type, u32 offset, u32 size); 2625 void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr); 2626 void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr); 2627 2628 bool dev_check_flush(void); 2629 bool cpu_map_check_flush(void); 2630 #else /* !CONFIG_BPF_SYSCALL */ 2631 static inline struct bpf_prog *bpf_prog_get(u32 ufd) 2632 { 2633 return ERR_PTR(-EOPNOTSUPP); 2634 } 2635 2636 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, 2637 enum bpf_prog_type type, 2638 bool attach_drv) 2639 { 2640 return ERR_PTR(-EOPNOTSUPP); 2641 } 2642 2643 static inline void bpf_prog_add(struct bpf_prog *prog, int i) 2644 { 2645 } 2646 2647 static inline void bpf_prog_sub(struct bpf_prog *prog, int i) 2648 { 2649 } 2650 2651 static inline void bpf_prog_put(struct bpf_prog *prog) 2652 { 2653 } 2654 2655 static inline void bpf_prog_inc(struct bpf_prog *prog) 2656 { 2657 } 2658 2659 static inline struct bpf_prog *__must_check 2660 bpf_prog_inc_not_zero(struct bpf_prog *prog) 2661 { 2662 return ERR_PTR(-EOPNOTSUPP); 2663 } 2664 2665 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type, 2666 const struct bpf_link_ops *ops, 2667 struct bpf_prog *prog) 2668 { 2669 } 2670 2671 static inline int bpf_link_prime(struct bpf_link *link, 2672 struct bpf_link_primer *primer) 2673 { 2674 return -EOPNOTSUPP; 2675 } 2676 2677 static inline int bpf_link_settle(struct bpf_link_primer *primer) 2678 { 2679 return -EOPNOTSUPP; 2680 } 2681 2682 static inline void bpf_link_cleanup(struct bpf_link_primer *primer) 2683 { 2684 } 2685 2686 static inline void bpf_link_inc(struct bpf_link *link) 2687 { 2688 } 2689 2690 static inline void bpf_link_put(struct bpf_link *link) 2691 { 2692 } 2693 2694 static inline int bpf_obj_get_user(const char __user *pathname, int flags) 2695 { 2696 return -EOPNOTSUPP; 2697 } 2698 2699 static inline bool bpf_token_capable(const struct bpf_token *token, int cap) 2700 { 2701 return capable(cap) || (cap != CAP_SYS_ADMIN && capable(CAP_SYS_ADMIN)); 2702 } 2703 2704 static inline void bpf_token_inc(struct bpf_token *token) 2705 { 2706 } 2707 2708 static inline void bpf_token_put(struct bpf_token *token) 2709 { 2710 } 2711 2712 static inline struct bpf_token *bpf_token_get_from_fd(u32 ufd) 2713 { 2714 return ERR_PTR(-EOPNOTSUPP); 2715 } 2716 2717 static inline void __dev_flush(void) 2718 { 2719 } 2720 2721 struct xdp_frame; 2722 struct bpf_dtab_netdev; 2723 struct bpf_cpu_map_entry; 2724 2725 static inline 2726 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf, 2727 struct net_device *dev_rx) 2728 { 2729 return 0; 2730 } 2731 2732 static inline 2733 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf, 2734 struct net_device *dev_rx) 2735 { 2736 return 0; 2737 } 2738 2739 static inline 2740 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx, 2741 struct bpf_map *map, bool exclude_ingress) 2742 { 2743 return 0; 2744 } 2745 2746 struct sk_buff; 2747 2748 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, 2749 struct sk_buff *skb, 2750 struct bpf_prog *xdp_prog) 2751 { 2752 return 0; 2753 } 2754 2755 static inline 2756 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb, 2757 struct bpf_prog *xdp_prog, struct bpf_map *map, 2758 bool exclude_ingress) 2759 { 2760 return 0; 2761 } 2762 2763 static inline void __cpu_map_flush(void) 2764 { 2765 } 2766 2767 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, 2768 struct xdp_frame *xdpf, 2769 struct net_device *dev_rx) 2770 { 2771 return 0; 2772 } 2773 2774 static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu, 2775 struct sk_buff *skb) 2776 { 2777 return -EOPNOTSUPP; 2778 } 2779 2780 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name, 2781 enum bpf_prog_type type) 2782 { 2783 return ERR_PTR(-EOPNOTSUPP); 2784 } 2785 2786 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog, 2787 const union bpf_attr *kattr, 2788 union bpf_attr __user *uattr) 2789 { 2790 return -ENOTSUPP; 2791 } 2792 2793 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog, 2794 const union bpf_attr *kattr, 2795 union bpf_attr __user *uattr) 2796 { 2797 return -ENOTSUPP; 2798 } 2799 2800 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog, 2801 const union bpf_attr *kattr, 2802 union bpf_attr __user *uattr) 2803 { 2804 return -ENOTSUPP; 2805 } 2806 2807 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, 2808 const union bpf_attr *kattr, 2809 union bpf_attr __user *uattr) 2810 { 2811 return -ENOTSUPP; 2812 } 2813 2814 static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog, 2815 const union bpf_attr *kattr, 2816 union bpf_attr __user *uattr) 2817 { 2818 return -ENOTSUPP; 2819 } 2820 2821 static inline void bpf_map_put(struct bpf_map *map) 2822 { 2823 } 2824 2825 static inline struct bpf_prog *bpf_prog_by_id(u32 id) 2826 { 2827 return ERR_PTR(-ENOTSUPP); 2828 } 2829 2830 static inline int btf_struct_access(struct bpf_verifier_log *log, 2831 const struct bpf_reg_state *reg, 2832 int off, int size, enum bpf_access_type atype, 2833 u32 *next_btf_id, enum bpf_type_flag *flag, 2834 const char **field_name) 2835 { 2836 return -EACCES; 2837 } 2838 2839 static inline const struct bpf_func_proto * 2840 bpf_base_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 2841 { 2842 return NULL; 2843 } 2844 2845 static inline void bpf_task_storage_free(struct task_struct *task) 2846 { 2847 } 2848 2849 static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog) 2850 { 2851 return false; 2852 } 2853 2854 static inline const struct btf_func_model * 2855 bpf_jit_find_kfunc_model(const struct bpf_prog *prog, 2856 const struct bpf_insn *insn) 2857 { 2858 return NULL; 2859 } 2860 2861 static inline int 2862 bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id, 2863 u16 btf_fd_idx, u8 **func_addr) 2864 { 2865 return -ENOTSUPP; 2866 } 2867 2868 static inline bool unprivileged_ebpf_enabled(void) 2869 { 2870 return false; 2871 } 2872 2873 static inline bool has_current_bpf_ctx(void) 2874 { 2875 return false; 2876 } 2877 2878 static inline void bpf_prog_inc_misses_counter(struct bpf_prog *prog) 2879 { 2880 } 2881 2882 static inline void bpf_cgrp_storage_free(struct cgroup *cgroup) 2883 { 2884 } 2885 2886 static inline void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data, 2887 enum bpf_dynptr_type type, u32 offset, u32 size) 2888 { 2889 } 2890 2891 static inline void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr) 2892 { 2893 } 2894 2895 static inline void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr) 2896 { 2897 } 2898 #endif /* CONFIG_BPF_SYSCALL */ 2899 2900 static __always_inline int 2901 bpf_probe_read_kernel_common(void *dst, u32 size, const void *unsafe_ptr) 2902 { 2903 int ret = -EFAULT; 2904 2905 if (IS_ENABLED(CONFIG_BPF_EVENTS)) 2906 ret = copy_from_kernel_nofault(dst, unsafe_ptr, size); 2907 if (unlikely(ret < 0)) 2908 memset(dst, 0, size); 2909 return ret; 2910 } 2911 2912 void __bpf_free_used_btfs(struct bpf_prog_aux *aux, 2913 struct btf_mod_pair *used_btfs, u32 len); 2914 2915 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd, 2916 enum bpf_prog_type type) 2917 { 2918 return bpf_prog_get_type_dev(ufd, type, false); 2919 } 2920 2921 void __bpf_free_used_maps(struct bpf_prog_aux *aux, 2922 struct bpf_map **used_maps, u32 len); 2923 2924 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool); 2925 2926 int bpf_prog_offload_compile(struct bpf_prog *prog); 2927 void bpf_prog_dev_bound_destroy(struct bpf_prog *prog); 2928 int bpf_prog_offload_info_fill(struct bpf_prog_info *info, 2929 struct bpf_prog *prog); 2930 2931 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map); 2932 2933 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value); 2934 int bpf_map_offload_update_elem(struct bpf_map *map, 2935 void *key, void *value, u64 flags); 2936 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key); 2937 int bpf_map_offload_get_next_key(struct bpf_map *map, 2938 void *key, void *next_key); 2939 2940 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map); 2941 2942 struct bpf_offload_dev * 2943 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv); 2944 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev); 2945 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev); 2946 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev, 2947 struct net_device *netdev); 2948 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev, 2949 struct net_device *netdev); 2950 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev); 2951 2952 void unpriv_ebpf_notify(int new_state); 2953 2954 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL) 2955 int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log, 2956 struct bpf_prog_aux *prog_aux); 2957 void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id); 2958 int bpf_prog_dev_bound_init(struct bpf_prog *prog, union bpf_attr *attr); 2959 int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog, struct bpf_prog *old_prog); 2960 void bpf_dev_bound_netdev_unregister(struct net_device *dev); 2961 2962 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux) 2963 { 2964 return aux->dev_bound; 2965 } 2966 2967 static inline bool bpf_prog_is_offloaded(const struct bpf_prog_aux *aux) 2968 { 2969 return aux->offload_requested; 2970 } 2971 2972 bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs); 2973 2974 static inline bool bpf_map_is_offloaded(struct bpf_map *map) 2975 { 2976 return unlikely(map->ops == &bpf_map_offload_ops); 2977 } 2978 2979 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr); 2980 void bpf_map_offload_map_free(struct bpf_map *map); 2981 u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map); 2982 int bpf_prog_test_run_syscall(struct bpf_prog *prog, 2983 const union bpf_attr *kattr, 2984 union bpf_attr __user *uattr); 2985 2986 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog); 2987 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype); 2988 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags); 2989 int sock_map_bpf_prog_query(const union bpf_attr *attr, 2990 union bpf_attr __user *uattr); 2991 2992 void sock_map_unhash(struct sock *sk); 2993 void sock_map_destroy(struct sock *sk); 2994 void sock_map_close(struct sock *sk, long timeout); 2995 #else 2996 static inline int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log, 2997 struct bpf_prog_aux *prog_aux) 2998 { 2999 return -EOPNOTSUPP; 3000 } 3001 3002 static inline void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, 3003 u32 func_id) 3004 { 3005 return NULL; 3006 } 3007 3008 static inline int bpf_prog_dev_bound_init(struct bpf_prog *prog, 3009 union bpf_attr *attr) 3010 { 3011 return -EOPNOTSUPP; 3012 } 3013 3014 static inline int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog, 3015 struct bpf_prog *old_prog) 3016 { 3017 return -EOPNOTSUPP; 3018 } 3019 3020 static inline void bpf_dev_bound_netdev_unregister(struct net_device *dev) 3021 { 3022 } 3023 3024 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux) 3025 { 3026 return false; 3027 } 3028 3029 static inline bool bpf_prog_is_offloaded(struct bpf_prog_aux *aux) 3030 { 3031 return false; 3032 } 3033 3034 static inline bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs) 3035 { 3036 return false; 3037 } 3038 3039 static inline bool bpf_map_is_offloaded(struct bpf_map *map) 3040 { 3041 return false; 3042 } 3043 3044 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr) 3045 { 3046 return ERR_PTR(-EOPNOTSUPP); 3047 } 3048 3049 static inline void bpf_map_offload_map_free(struct bpf_map *map) 3050 { 3051 } 3052 3053 static inline u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map) 3054 { 3055 return 0; 3056 } 3057 3058 static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog, 3059 const union bpf_attr *kattr, 3060 union bpf_attr __user *uattr) 3061 { 3062 return -ENOTSUPP; 3063 } 3064 3065 #ifdef CONFIG_BPF_SYSCALL 3066 static inline int sock_map_get_from_fd(const union bpf_attr *attr, 3067 struct bpf_prog *prog) 3068 { 3069 return -EINVAL; 3070 } 3071 3072 static inline int sock_map_prog_detach(const union bpf_attr *attr, 3073 enum bpf_prog_type ptype) 3074 { 3075 return -EOPNOTSUPP; 3076 } 3077 3078 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, 3079 u64 flags) 3080 { 3081 return -EOPNOTSUPP; 3082 } 3083 3084 static inline int sock_map_bpf_prog_query(const union bpf_attr *attr, 3085 union bpf_attr __user *uattr) 3086 { 3087 return -EINVAL; 3088 } 3089 #endif /* CONFIG_BPF_SYSCALL */ 3090 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */ 3091 3092 static __always_inline void 3093 bpf_prog_inc_misses_counters(const struct bpf_prog_array *array) 3094 { 3095 const struct bpf_prog_array_item *item; 3096 struct bpf_prog *prog; 3097 3098 if (unlikely(!array)) 3099 return; 3100 3101 item = &array->items[0]; 3102 while ((prog = READ_ONCE(item->prog))) { 3103 bpf_prog_inc_misses_counter(prog); 3104 item++; 3105 } 3106 } 3107 3108 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) 3109 void bpf_sk_reuseport_detach(struct sock *sk); 3110 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key, 3111 void *value); 3112 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key, 3113 void *value, u64 map_flags); 3114 #else 3115 static inline void bpf_sk_reuseport_detach(struct sock *sk) 3116 { 3117 } 3118 3119 #ifdef CONFIG_BPF_SYSCALL 3120 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, 3121 void *key, void *value) 3122 { 3123 return -EOPNOTSUPP; 3124 } 3125 3126 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, 3127 void *key, void *value, 3128 u64 map_flags) 3129 { 3130 return -EOPNOTSUPP; 3131 } 3132 #endif /* CONFIG_BPF_SYSCALL */ 3133 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */ 3134 3135 /* verifier prototypes for helper functions called from eBPF programs */ 3136 extern const struct bpf_func_proto bpf_map_lookup_elem_proto; 3137 extern const struct bpf_func_proto bpf_map_update_elem_proto; 3138 extern const struct bpf_func_proto bpf_map_delete_elem_proto; 3139 extern const struct bpf_func_proto bpf_map_push_elem_proto; 3140 extern const struct bpf_func_proto bpf_map_pop_elem_proto; 3141 extern const struct bpf_func_proto bpf_map_peek_elem_proto; 3142 extern const struct bpf_func_proto bpf_map_lookup_percpu_elem_proto; 3143 3144 extern const struct bpf_func_proto bpf_get_prandom_u32_proto; 3145 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto; 3146 extern const struct bpf_func_proto bpf_get_numa_node_id_proto; 3147 extern const struct bpf_func_proto bpf_tail_call_proto; 3148 extern const struct bpf_func_proto bpf_ktime_get_ns_proto; 3149 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto; 3150 extern const struct bpf_func_proto bpf_ktime_get_tai_ns_proto; 3151 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto; 3152 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto; 3153 extern const struct bpf_func_proto bpf_get_current_comm_proto; 3154 extern const struct bpf_func_proto bpf_get_stackid_proto; 3155 extern const struct bpf_func_proto bpf_get_stack_proto; 3156 extern const struct bpf_func_proto bpf_get_task_stack_proto; 3157 extern const struct bpf_func_proto bpf_get_stackid_proto_pe; 3158 extern const struct bpf_func_proto bpf_get_stack_proto_pe; 3159 extern const struct bpf_func_proto bpf_sock_map_update_proto; 3160 extern const struct bpf_func_proto bpf_sock_hash_update_proto; 3161 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto; 3162 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto; 3163 extern const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto; 3164 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto; 3165 extern const struct bpf_func_proto bpf_msg_redirect_map_proto; 3166 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto; 3167 extern const struct bpf_func_proto bpf_sk_redirect_map_proto; 3168 extern const struct bpf_func_proto bpf_spin_lock_proto; 3169 extern const struct bpf_func_proto bpf_spin_unlock_proto; 3170 extern const struct bpf_func_proto bpf_get_local_storage_proto; 3171 extern const struct bpf_func_proto bpf_strtol_proto; 3172 extern const struct bpf_func_proto bpf_strtoul_proto; 3173 extern const struct bpf_func_proto bpf_tcp_sock_proto; 3174 extern const struct bpf_func_proto bpf_jiffies64_proto; 3175 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto; 3176 extern const struct bpf_func_proto bpf_event_output_data_proto; 3177 extern const struct bpf_func_proto bpf_ringbuf_output_proto; 3178 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto; 3179 extern const struct bpf_func_proto bpf_ringbuf_submit_proto; 3180 extern const struct bpf_func_proto bpf_ringbuf_discard_proto; 3181 extern const struct bpf_func_proto bpf_ringbuf_query_proto; 3182 extern const struct bpf_func_proto bpf_ringbuf_reserve_dynptr_proto; 3183 extern const struct bpf_func_proto bpf_ringbuf_submit_dynptr_proto; 3184 extern const struct bpf_func_proto bpf_ringbuf_discard_dynptr_proto; 3185 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto; 3186 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto; 3187 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto; 3188 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto; 3189 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto; 3190 extern const struct bpf_func_proto bpf_skc_to_unix_sock_proto; 3191 extern const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto; 3192 extern const struct bpf_func_proto bpf_copy_from_user_proto; 3193 extern const struct bpf_func_proto bpf_snprintf_btf_proto; 3194 extern const struct bpf_func_proto bpf_snprintf_proto; 3195 extern const struct bpf_func_proto bpf_per_cpu_ptr_proto; 3196 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto; 3197 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto; 3198 extern const struct bpf_func_proto bpf_sock_from_file_proto; 3199 extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto; 3200 extern const struct bpf_func_proto bpf_task_storage_get_recur_proto; 3201 extern const struct bpf_func_proto bpf_task_storage_get_proto; 3202 extern const struct bpf_func_proto bpf_task_storage_delete_recur_proto; 3203 extern const struct bpf_func_proto bpf_task_storage_delete_proto; 3204 extern const struct bpf_func_proto bpf_for_each_map_elem_proto; 3205 extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto; 3206 extern const struct bpf_func_proto bpf_sk_setsockopt_proto; 3207 extern const struct bpf_func_proto bpf_sk_getsockopt_proto; 3208 extern const struct bpf_func_proto bpf_unlocked_sk_setsockopt_proto; 3209 extern const struct bpf_func_proto bpf_unlocked_sk_getsockopt_proto; 3210 extern const struct bpf_func_proto bpf_find_vma_proto; 3211 extern const struct bpf_func_proto bpf_loop_proto; 3212 extern const struct bpf_func_proto bpf_copy_from_user_task_proto; 3213 extern const struct bpf_func_proto bpf_set_retval_proto; 3214 extern const struct bpf_func_proto bpf_get_retval_proto; 3215 extern const struct bpf_func_proto bpf_user_ringbuf_drain_proto; 3216 extern const struct bpf_func_proto bpf_cgrp_storage_get_proto; 3217 extern const struct bpf_func_proto bpf_cgrp_storage_delete_proto; 3218 3219 const struct bpf_func_proto *tracing_prog_func_proto( 3220 enum bpf_func_id func_id, const struct bpf_prog *prog); 3221 3222 /* Shared helpers among cBPF and eBPF. */ 3223 void bpf_user_rnd_init_once(void); 3224 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 3225 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 3226 3227 #if defined(CONFIG_NET) 3228 bool bpf_sock_common_is_valid_access(int off, int size, 3229 enum bpf_access_type type, 3230 struct bpf_insn_access_aux *info); 3231 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type, 3232 struct bpf_insn_access_aux *info); 3233 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 3234 const struct bpf_insn *si, 3235 struct bpf_insn *insn_buf, 3236 struct bpf_prog *prog, 3237 u32 *target_size); 3238 int bpf_dynptr_from_skb_rdonly(struct sk_buff *skb, u64 flags, 3239 struct bpf_dynptr_kern *ptr); 3240 #else 3241 static inline bool bpf_sock_common_is_valid_access(int off, int size, 3242 enum bpf_access_type type, 3243 struct bpf_insn_access_aux *info) 3244 { 3245 return false; 3246 } 3247 static inline bool bpf_sock_is_valid_access(int off, int size, 3248 enum bpf_access_type type, 3249 struct bpf_insn_access_aux *info) 3250 { 3251 return false; 3252 } 3253 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 3254 const struct bpf_insn *si, 3255 struct bpf_insn *insn_buf, 3256 struct bpf_prog *prog, 3257 u32 *target_size) 3258 { 3259 return 0; 3260 } 3261 static inline int bpf_dynptr_from_skb_rdonly(struct sk_buff *skb, u64 flags, 3262 struct bpf_dynptr_kern *ptr) 3263 { 3264 return -EOPNOTSUPP; 3265 } 3266 #endif 3267 3268 #ifdef CONFIG_INET 3269 struct sk_reuseport_kern { 3270 struct sk_buff *skb; 3271 struct sock *sk; 3272 struct sock *selected_sk; 3273 struct sock *migrating_sk; 3274 void *data_end; 3275 u32 hash; 3276 u32 reuseport_id; 3277 bool bind_inany; 3278 }; 3279 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 3280 struct bpf_insn_access_aux *info); 3281 3282 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, 3283 const struct bpf_insn *si, 3284 struct bpf_insn *insn_buf, 3285 struct bpf_prog *prog, 3286 u32 *target_size); 3287 3288 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 3289 struct bpf_insn_access_aux *info); 3290 3291 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, 3292 const struct bpf_insn *si, 3293 struct bpf_insn *insn_buf, 3294 struct bpf_prog *prog, 3295 u32 *target_size); 3296 #else 3297 static inline bool bpf_tcp_sock_is_valid_access(int off, int size, 3298 enum bpf_access_type type, 3299 struct bpf_insn_access_aux *info) 3300 { 3301 return false; 3302 } 3303 3304 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, 3305 const struct bpf_insn *si, 3306 struct bpf_insn *insn_buf, 3307 struct bpf_prog *prog, 3308 u32 *target_size) 3309 { 3310 return 0; 3311 } 3312 static inline bool bpf_xdp_sock_is_valid_access(int off, int size, 3313 enum bpf_access_type type, 3314 struct bpf_insn_access_aux *info) 3315 { 3316 return false; 3317 } 3318 3319 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, 3320 const struct bpf_insn *si, 3321 struct bpf_insn *insn_buf, 3322 struct bpf_prog *prog, 3323 u32 *target_size) 3324 { 3325 return 0; 3326 } 3327 #endif /* CONFIG_INET */ 3328 3329 enum bpf_text_poke_type { 3330 BPF_MOD_CALL, 3331 BPF_MOD_JUMP, 3332 }; 3333 3334 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t, 3335 void *addr1, void *addr2); 3336 3337 void bpf_arch_poke_desc_update(struct bpf_jit_poke_descriptor *poke, 3338 struct bpf_prog *new, struct bpf_prog *old); 3339 3340 void *bpf_arch_text_copy(void *dst, void *src, size_t len); 3341 int bpf_arch_text_invalidate(void *dst, size_t len); 3342 3343 struct btf_id_set; 3344 bool btf_id_set_contains(const struct btf_id_set *set, u32 id); 3345 3346 #define MAX_BPRINTF_VARARGS 12 3347 #define MAX_BPRINTF_BUF 1024 3348 3349 struct bpf_bprintf_data { 3350 u32 *bin_args; 3351 char *buf; 3352 bool get_bin_args; 3353 bool get_buf; 3354 }; 3355 3356 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args, 3357 u32 num_args, struct bpf_bprintf_data *data); 3358 void bpf_bprintf_cleanup(struct bpf_bprintf_data *data); 3359 3360 #ifdef CONFIG_BPF_LSM 3361 void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype); 3362 void bpf_cgroup_atype_put(int cgroup_atype); 3363 #else 3364 static inline void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype) {} 3365 static inline void bpf_cgroup_atype_put(int cgroup_atype) {} 3366 #endif /* CONFIG_BPF_LSM */ 3367 3368 struct key; 3369 3370 #ifdef CONFIG_KEYS 3371 struct bpf_key { 3372 struct key *key; 3373 bool has_ref; 3374 }; 3375 #endif /* CONFIG_KEYS */ 3376 3377 static inline bool type_is_alloc(u32 type) 3378 { 3379 return type & MEM_ALLOC; 3380 } 3381 3382 static inline gfp_t bpf_memcg_flags(gfp_t flags) 3383 { 3384 if (memcg_bpf_enabled()) 3385 return flags | __GFP_ACCOUNT; 3386 return flags; 3387 } 3388 3389 static inline bool bpf_is_subprog(const struct bpf_prog *prog) 3390 { 3391 return prog->aux->func_idx != 0; 3392 } 3393 3394 #endif /* _LINUX_BPF_H */ 3395