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