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 9 #include <linux/workqueue.h> 10 #include <linux/file.h> 11 #include <linux/percpu.h> 12 #include <linux/err.h> 13 #include <linux/rbtree_latch.h> 14 #include <linux/numa.h> 15 #include <linux/mm_types.h> 16 #include <linux/wait.h> 17 #include <linux/refcount.h> 18 #include <linux/mutex.h> 19 #include <linux/module.h> 20 #include <linux/kallsyms.h> 21 #include <linux/capability.h> 22 #include <linux/sched/mm.h> 23 #include <linux/slab.h> 24 #include <linux/percpu-refcount.h> 25 #include <linux/bpfptr.h> 26 #include <linux/btf.h> 27 28 struct bpf_verifier_env; 29 struct bpf_verifier_log; 30 struct perf_event; 31 struct bpf_prog; 32 struct bpf_prog_aux; 33 struct bpf_map; 34 struct sock; 35 struct seq_file; 36 struct btf; 37 struct btf_type; 38 struct exception_table_entry; 39 struct seq_operations; 40 struct bpf_iter_aux_info; 41 struct bpf_local_storage; 42 struct bpf_local_storage_map; 43 struct kobject; 44 struct mem_cgroup; 45 struct module; 46 struct bpf_func_state; 47 48 extern struct idr btf_idr; 49 extern spinlock_t btf_idr_lock; 50 extern struct kobject *btf_kobj; 51 52 typedef u64 (*bpf_callback_t)(u64, u64, u64, u64, u64); 53 typedef int (*bpf_iter_init_seq_priv_t)(void *private_data, 54 struct bpf_iter_aux_info *aux); 55 typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data); 56 struct bpf_iter_seq_info { 57 const struct seq_operations *seq_ops; 58 bpf_iter_init_seq_priv_t init_seq_private; 59 bpf_iter_fini_seq_priv_t fini_seq_private; 60 u32 seq_priv_size; 61 }; 62 63 /* map is generic key/value storage optionally accessible by eBPF programs */ 64 struct bpf_map_ops { 65 /* funcs callable from userspace (via syscall) */ 66 int (*map_alloc_check)(union bpf_attr *attr); 67 struct bpf_map *(*map_alloc)(union bpf_attr *attr); 68 void (*map_release)(struct bpf_map *map, struct file *map_file); 69 void (*map_free)(struct bpf_map *map); 70 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key); 71 void (*map_release_uref)(struct bpf_map *map); 72 void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key); 73 int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr, 74 union bpf_attr __user *uattr); 75 int (*map_lookup_and_delete_elem)(struct bpf_map *map, void *key, 76 void *value, u64 flags); 77 int (*map_lookup_and_delete_batch)(struct bpf_map *map, 78 const union bpf_attr *attr, 79 union bpf_attr __user *uattr); 80 int (*map_update_batch)(struct bpf_map *map, const union bpf_attr *attr, 81 union bpf_attr __user *uattr); 82 int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr, 83 union bpf_attr __user *uattr); 84 85 /* funcs callable from userspace and from eBPF programs */ 86 void *(*map_lookup_elem)(struct bpf_map *map, void *key); 87 int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags); 88 int (*map_delete_elem)(struct bpf_map *map, void *key); 89 int (*map_push_elem)(struct bpf_map *map, void *value, u64 flags); 90 int (*map_pop_elem)(struct bpf_map *map, void *value); 91 int (*map_peek_elem)(struct bpf_map *map, void *value); 92 93 /* funcs called by prog_array and perf_event_array map */ 94 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file, 95 int fd); 96 void (*map_fd_put_ptr)(void *ptr); 97 int (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf); 98 u32 (*map_fd_sys_lookup_elem)(void *ptr); 99 void (*map_seq_show_elem)(struct bpf_map *map, void *key, 100 struct seq_file *m); 101 int (*map_check_btf)(const struct bpf_map *map, 102 const struct btf *btf, 103 const struct btf_type *key_type, 104 const struct btf_type *value_type); 105 106 /* Prog poke tracking helpers. */ 107 int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux); 108 void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux); 109 void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old, 110 struct bpf_prog *new); 111 112 /* Direct value access helpers. */ 113 int (*map_direct_value_addr)(const struct bpf_map *map, 114 u64 *imm, u32 off); 115 int (*map_direct_value_meta)(const struct bpf_map *map, 116 u64 imm, u32 *off); 117 int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma); 118 __poll_t (*map_poll)(struct bpf_map *map, struct file *filp, 119 struct poll_table_struct *pts); 120 121 /* Functions called by bpf_local_storage maps */ 122 int (*map_local_storage_charge)(struct bpf_local_storage_map *smap, 123 void *owner, u32 size); 124 void (*map_local_storage_uncharge)(struct bpf_local_storage_map *smap, 125 void *owner, u32 size); 126 struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner); 127 128 /* Misc helpers.*/ 129 int (*map_redirect)(struct bpf_map *map, u32 ifindex, u64 flags); 130 131 /* map_meta_equal must be implemented for maps that can be 132 * used as an inner map. It is a runtime check to ensure 133 * an inner map can be inserted to an outer map. 134 * 135 * Some properties of the inner map has been used during the 136 * verification time. When inserting an inner map at the runtime, 137 * map_meta_equal has to ensure the inserting map has the same 138 * properties that the verifier has used earlier. 139 */ 140 bool (*map_meta_equal)(const struct bpf_map *meta0, 141 const struct bpf_map *meta1); 142 143 144 int (*map_set_for_each_callback_args)(struct bpf_verifier_env *env, 145 struct bpf_func_state *caller, 146 struct bpf_func_state *callee); 147 int (*map_for_each_callback)(struct bpf_map *map, 148 bpf_callback_t callback_fn, 149 void *callback_ctx, u64 flags); 150 151 /* BTF id of struct allocated by map_alloc */ 152 int *map_btf_id; 153 154 /* bpf_iter info used to open a seq_file */ 155 const struct bpf_iter_seq_info *iter_seq_info; 156 }; 157 158 enum { 159 /* Support at most 8 pointers in a BPF map value */ 160 BPF_MAP_VALUE_OFF_MAX = 8, 161 BPF_MAP_OFF_ARR_MAX = BPF_MAP_VALUE_OFF_MAX + 162 1 + /* for bpf_spin_lock */ 163 1, /* for bpf_timer */ 164 }; 165 166 enum bpf_kptr_type { 167 BPF_KPTR_UNREF, 168 BPF_KPTR_REF, 169 }; 170 171 struct bpf_map_value_off_desc { 172 u32 offset; 173 enum bpf_kptr_type type; 174 struct { 175 struct btf *btf; 176 struct module *module; 177 btf_dtor_kfunc_t dtor; 178 u32 btf_id; 179 } kptr; 180 }; 181 182 struct bpf_map_value_off { 183 u32 nr_off; 184 struct bpf_map_value_off_desc off[]; 185 }; 186 187 struct bpf_map_off_arr { 188 u32 cnt; 189 u32 field_off[BPF_MAP_OFF_ARR_MAX]; 190 u8 field_sz[BPF_MAP_OFF_ARR_MAX]; 191 }; 192 193 struct bpf_map { 194 /* The first two cachelines with read-mostly members of which some 195 * are also accessed in fast-path (e.g. ops, max_entries). 196 */ 197 const struct bpf_map_ops *ops ____cacheline_aligned; 198 struct bpf_map *inner_map_meta; 199 #ifdef CONFIG_SECURITY 200 void *security; 201 #endif 202 enum bpf_map_type map_type; 203 u32 key_size; 204 u32 value_size; 205 u32 max_entries; 206 u64 map_extra; /* any per-map-type extra fields */ 207 u32 map_flags; 208 int spin_lock_off; /* >=0 valid offset, <0 error */ 209 struct bpf_map_value_off *kptr_off_tab; 210 int timer_off; /* >=0 valid offset, <0 error */ 211 u32 id; 212 int numa_node; 213 u32 btf_key_type_id; 214 u32 btf_value_type_id; 215 u32 btf_vmlinux_value_type_id; 216 struct btf *btf; 217 #ifdef CONFIG_MEMCG_KMEM 218 struct mem_cgroup *memcg; 219 #endif 220 char name[BPF_OBJ_NAME_LEN]; 221 struct bpf_map_off_arr *off_arr; 222 /* The 3rd and 4th cacheline with misc members to avoid false sharing 223 * particularly with refcounting. 224 */ 225 atomic64_t refcnt ____cacheline_aligned; 226 atomic64_t usercnt; 227 struct work_struct work; 228 struct mutex freeze_mutex; 229 atomic64_t writecnt; 230 /* 'Ownership' of program-containing map is claimed by the first program 231 * that is going to use this map or by the first program which FD is 232 * stored in the map to make sure that all callers and callees have the 233 * same prog type, JITed flag and xdp_has_frags flag. 234 */ 235 struct { 236 spinlock_t lock; 237 enum bpf_prog_type type; 238 bool jited; 239 bool xdp_has_frags; 240 } owner; 241 bool bypass_spec_v1; 242 bool frozen; /* write-once; write-protected by freeze_mutex */ 243 }; 244 245 static inline bool map_value_has_spin_lock(const struct bpf_map *map) 246 { 247 return map->spin_lock_off >= 0; 248 } 249 250 static inline bool map_value_has_timer(const struct bpf_map *map) 251 { 252 return map->timer_off >= 0; 253 } 254 255 static inline bool map_value_has_kptrs(const struct bpf_map *map) 256 { 257 return !IS_ERR_OR_NULL(map->kptr_off_tab); 258 } 259 260 static inline void check_and_init_map_value(struct bpf_map *map, void *dst) 261 { 262 if (unlikely(map_value_has_spin_lock(map))) 263 memset(dst + map->spin_lock_off, 0, sizeof(struct bpf_spin_lock)); 264 if (unlikely(map_value_has_timer(map))) 265 memset(dst + map->timer_off, 0, sizeof(struct bpf_timer)); 266 if (unlikely(map_value_has_kptrs(map))) { 267 struct bpf_map_value_off *tab = map->kptr_off_tab; 268 int i; 269 270 for (i = 0; i < tab->nr_off; i++) 271 *(u64 *)(dst + tab->off[i].offset) = 0; 272 } 273 } 274 275 /* copy everything but bpf_spin_lock and bpf_timer. There could be one of each. */ 276 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src) 277 { 278 u32 curr_off = 0; 279 int i; 280 281 if (likely(!map->off_arr)) { 282 memcpy(dst, src, map->value_size); 283 return; 284 } 285 286 for (i = 0; i < map->off_arr->cnt; i++) { 287 u32 next_off = map->off_arr->field_off[i]; 288 289 memcpy(dst + curr_off, src + curr_off, next_off - curr_off); 290 curr_off += map->off_arr->field_sz[i]; 291 } 292 memcpy(dst + curr_off, src + curr_off, map->value_size - curr_off); 293 } 294 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src, 295 bool lock_src); 296 void bpf_timer_cancel_and_free(void *timer); 297 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size); 298 299 struct bpf_offload_dev; 300 struct bpf_offloaded_map; 301 302 struct bpf_map_dev_ops { 303 int (*map_get_next_key)(struct bpf_offloaded_map *map, 304 void *key, void *next_key); 305 int (*map_lookup_elem)(struct bpf_offloaded_map *map, 306 void *key, void *value); 307 int (*map_update_elem)(struct bpf_offloaded_map *map, 308 void *key, void *value, u64 flags); 309 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key); 310 }; 311 312 struct bpf_offloaded_map { 313 struct bpf_map map; 314 struct net_device *netdev; 315 const struct bpf_map_dev_ops *dev_ops; 316 void *dev_priv; 317 struct list_head offloads; 318 }; 319 320 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map) 321 { 322 return container_of(map, struct bpf_offloaded_map, map); 323 } 324 325 static inline bool bpf_map_offload_neutral(const struct bpf_map *map) 326 { 327 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY; 328 } 329 330 static inline bool bpf_map_support_seq_show(const struct bpf_map *map) 331 { 332 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) && 333 map->ops->map_seq_show_elem; 334 } 335 336 int map_check_no_btf(const struct bpf_map *map, 337 const struct btf *btf, 338 const struct btf_type *key_type, 339 const struct btf_type *value_type); 340 341 bool bpf_map_meta_equal(const struct bpf_map *meta0, 342 const struct bpf_map *meta1); 343 344 extern const struct bpf_map_ops bpf_map_offload_ops; 345 346 /* bpf_type_flag contains a set of flags that are applicable to the values of 347 * arg_type, ret_type and reg_type. For example, a pointer value may be null, 348 * or a memory is read-only. We classify types into two categories: base types 349 * and extended types. Extended types are base types combined with a type flag. 350 * 351 * Currently there are no more than 32 base types in arg_type, ret_type and 352 * reg_types. 353 */ 354 #define BPF_BASE_TYPE_BITS 8 355 356 enum bpf_type_flag { 357 /* PTR may be NULL. */ 358 PTR_MAYBE_NULL = BIT(0 + BPF_BASE_TYPE_BITS), 359 360 /* MEM is read-only. When applied on bpf_arg, it indicates the arg is 361 * compatible with both mutable and immutable memory. 362 */ 363 MEM_RDONLY = BIT(1 + BPF_BASE_TYPE_BITS), 364 365 /* MEM was "allocated" from a different helper, and cannot be mixed 366 * with regular non-MEM_ALLOC'ed MEM types. 367 */ 368 MEM_ALLOC = BIT(2 + BPF_BASE_TYPE_BITS), 369 370 /* MEM is in user address space. */ 371 MEM_USER = BIT(3 + BPF_BASE_TYPE_BITS), 372 373 /* MEM is a percpu memory. MEM_PERCPU tags PTR_TO_BTF_ID. When tagged 374 * with MEM_PERCPU, PTR_TO_BTF_ID _cannot_ be directly accessed. In 375 * order to drop this tag, it must be passed into bpf_per_cpu_ptr() 376 * or bpf_this_cpu_ptr(), which will return the pointer corresponding 377 * to the specified cpu. 378 */ 379 MEM_PERCPU = BIT(4 + BPF_BASE_TYPE_BITS), 380 381 /* Indicates that the argument will be released. */ 382 OBJ_RELEASE = BIT(5 + BPF_BASE_TYPE_BITS), 383 384 /* PTR is not trusted. This is only used with PTR_TO_BTF_ID, to mark 385 * unreferenced and referenced kptr loaded from map value using a load 386 * instruction, so that they can only be dereferenced but not escape the 387 * BPF program into the kernel (i.e. cannot be passed as arguments to 388 * kfunc or bpf helpers). 389 */ 390 PTR_UNTRUSTED = BIT(6 + BPF_BASE_TYPE_BITS), 391 392 __BPF_TYPE_LAST_FLAG = PTR_UNTRUSTED, 393 }; 394 395 /* Max number of base types. */ 396 #define BPF_BASE_TYPE_LIMIT (1UL << BPF_BASE_TYPE_BITS) 397 398 /* Max number of all types. */ 399 #define BPF_TYPE_LIMIT (__BPF_TYPE_LAST_FLAG | (__BPF_TYPE_LAST_FLAG - 1)) 400 401 /* function argument constraints */ 402 enum bpf_arg_type { 403 ARG_DONTCARE = 0, /* unused argument in helper function */ 404 405 /* the following constraints used to prototype 406 * bpf_map_lookup/update/delete_elem() functions 407 */ 408 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */ 409 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */ 410 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */ 411 ARG_PTR_TO_UNINIT_MAP_VALUE, /* pointer to valid memory used to store a map value */ 412 413 /* the following constraints used to prototype bpf_memcmp() and other 414 * functions that access data on eBPF program stack 415 */ 416 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */ 417 ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized, 418 * helper function must fill all bytes or clear 419 * them in error case. 420 */ 421 422 ARG_CONST_SIZE, /* number of bytes accessed from memory */ 423 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */ 424 425 ARG_PTR_TO_CTX, /* pointer to context */ 426 ARG_ANYTHING, /* any (initialized) argument is ok */ 427 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */ 428 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */ 429 ARG_PTR_TO_INT, /* pointer to int */ 430 ARG_PTR_TO_LONG, /* pointer to long */ 431 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */ 432 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */ 433 ARG_PTR_TO_ALLOC_MEM, /* pointer to dynamically allocated memory */ 434 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */ 435 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */ 436 ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */ 437 ARG_PTR_TO_FUNC, /* pointer to a bpf program function */ 438 ARG_PTR_TO_STACK, /* pointer to stack */ 439 ARG_PTR_TO_CONST_STR, /* pointer to a null terminated read-only string */ 440 ARG_PTR_TO_TIMER, /* pointer to bpf_timer */ 441 ARG_PTR_TO_KPTR, /* pointer to referenced kptr */ 442 __BPF_ARG_TYPE_MAX, 443 444 /* Extended arg_types. */ 445 ARG_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MAP_VALUE, 446 ARG_PTR_TO_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MEM, 447 ARG_PTR_TO_CTX_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_CTX, 448 ARG_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_SOCKET, 449 ARG_PTR_TO_ALLOC_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_ALLOC_MEM, 450 ARG_PTR_TO_STACK_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_STACK, 451 ARG_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_BTF_ID, 452 453 /* This must be the last entry. Its purpose is to ensure the enum is 454 * wide enough to hold the higher bits reserved for bpf_type_flag. 455 */ 456 __BPF_ARG_TYPE_LIMIT = BPF_TYPE_LIMIT, 457 }; 458 static_assert(__BPF_ARG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT); 459 460 /* type of values returned from helper functions */ 461 enum bpf_return_type { 462 RET_INTEGER, /* function returns integer */ 463 RET_VOID, /* function doesn't return anything */ 464 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */ 465 RET_PTR_TO_SOCKET, /* returns a pointer to a socket */ 466 RET_PTR_TO_TCP_SOCK, /* returns a pointer to a tcp_sock */ 467 RET_PTR_TO_SOCK_COMMON, /* returns a pointer to a sock_common */ 468 RET_PTR_TO_ALLOC_MEM, /* returns a pointer to dynamically allocated memory */ 469 RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */ 470 RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */ 471 __BPF_RET_TYPE_MAX, 472 473 /* Extended ret_types. */ 474 RET_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MAP_VALUE, 475 RET_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCKET, 476 RET_PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_TCP_SOCK, 477 RET_PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCK_COMMON, 478 RET_PTR_TO_ALLOC_MEM_OR_NULL = PTR_MAYBE_NULL | MEM_ALLOC | RET_PTR_TO_ALLOC_MEM, 479 RET_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_BTF_ID, 480 481 /* This must be the last entry. Its purpose is to ensure the enum is 482 * wide enough to hold the higher bits reserved for bpf_type_flag. 483 */ 484 __BPF_RET_TYPE_LIMIT = BPF_TYPE_LIMIT, 485 }; 486 static_assert(__BPF_RET_TYPE_MAX <= BPF_BASE_TYPE_LIMIT); 487 488 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs 489 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL 490 * instructions after verifying 491 */ 492 struct bpf_func_proto { 493 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 494 bool gpl_only; 495 bool pkt_access; 496 enum bpf_return_type ret_type; 497 union { 498 struct { 499 enum bpf_arg_type arg1_type; 500 enum bpf_arg_type arg2_type; 501 enum bpf_arg_type arg3_type; 502 enum bpf_arg_type arg4_type; 503 enum bpf_arg_type arg5_type; 504 }; 505 enum bpf_arg_type arg_type[5]; 506 }; 507 union { 508 struct { 509 u32 *arg1_btf_id; 510 u32 *arg2_btf_id; 511 u32 *arg3_btf_id; 512 u32 *arg4_btf_id; 513 u32 *arg5_btf_id; 514 }; 515 u32 *arg_btf_id[5]; 516 }; 517 int *ret_btf_id; /* return value btf_id */ 518 bool (*allowed)(const struct bpf_prog *prog); 519 }; 520 521 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is 522 * the first argument to eBPF programs. 523 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *' 524 */ 525 struct bpf_context; 526 527 enum bpf_access_type { 528 BPF_READ = 1, 529 BPF_WRITE = 2 530 }; 531 532 /* types of values stored in eBPF registers */ 533 /* Pointer types represent: 534 * pointer 535 * pointer + imm 536 * pointer + (u16) var 537 * pointer + (u16) var + imm 538 * if (range > 0) then [ptr, ptr + range - off) is safe to access 539 * if (id > 0) means that some 'var' was added 540 * if (off > 0) means that 'imm' was added 541 */ 542 enum bpf_reg_type { 543 NOT_INIT = 0, /* nothing was written into register */ 544 SCALAR_VALUE, /* reg doesn't contain a valid pointer */ 545 PTR_TO_CTX, /* reg points to bpf_context */ 546 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */ 547 PTR_TO_MAP_VALUE, /* reg points to map element value */ 548 PTR_TO_MAP_KEY, /* reg points to a map element key */ 549 PTR_TO_STACK, /* reg == frame_pointer + offset */ 550 PTR_TO_PACKET_META, /* skb->data - meta_len */ 551 PTR_TO_PACKET, /* reg points to skb->data */ 552 PTR_TO_PACKET_END, /* skb->data + headlen */ 553 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */ 554 PTR_TO_SOCKET, /* reg points to struct bpf_sock */ 555 PTR_TO_SOCK_COMMON, /* reg points to sock_common */ 556 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */ 557 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */ 558 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */ 559 /* PTR_TO_BTF_ID points to a kernel struct that does not need 560 * to be null checked by the BPF program. This does not imply the 561 * pointer is _not_ null and in practice this can easily be a null 562 * pointer when reading pointer chains. The assumption is program 563 * context will handle null pointer dereference typically via fault 564 * handling. The verifier must keep this in mind and can make no 565 * assumptions about null or non-null when doing branch analysis. 566 * Further, when passed into helpers the helpers can not, without 567 * additional context, assume the value is non-null. 568 */ 569 PTR_TO_BTF_ID, 570 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not 571 * been checked for null. Used primarily to inform the verifier 572 * an explicit null check is required for this struct. 573 */ 574 PTR_TO_MEM, /* reg points to valid memory region */ 575 PTR_TO_BUF, /* reg points to a read/write buffer */ 576 PTR_TO_FUNC, /* reg points to a bpf program function */ 577 __BPF_REG_TYPE_MAX, 578 579 /* Extended reg_types. */ 580 PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | PTR_TO_MAP_VALUE, 581 PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCKET, 582 PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON, 583 PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK, 584 PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | PTR_TO_BTF_ID, 585 586 /* This must be the last entry. Its purpose is to ensure the enum is 587 * wide enough to hold the higher bits reserved for bpf_type_flag. 588 */ 589 __BPF_REG_TYPE_LIMIT = BPF_TYPE_LIMIT, 590 }; 591 static_assert(__BPF_REG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT); 592 593 /* The information passed from prog-specific *_is_valid_access 594 * back to the verifier. 595 */ 596 struct bpf_insn_access_aux { 597 enum bpf_reg_type reg_type; 598 union { 599 int ctx_field_size; 600 struct { 601 struct btf *btf; 602 u32 btf_id; 603 }; 604 }; 605 struct bpf_verifier_log *log; /* for verbose logs */ 606 }; 607 608 static inline void 609 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size) 610 { 611 aux->ctx_field_size = size; 612 } 613 614 static inline bool bpf_pseudo_func(const struct bpf_insn *insn) 615 { 616 return insn->code == (BPF_LD | BPF_IMM | BPF_DW) && 617 insn->src_reg == BPF_PSEUDO_FUNC; 618 } 619 620 struct bpf_prog_ops { 621 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr, 622 union bpf_attr __user *uattr); 623 }; 624 625 struct bpf_verifier_ops { 626 /* return eBPF function prototype for verification */ 627 const struct bpf_func_proto * 628 (*get_func_proto)(enum bpf_func_id func_id, 629 const struct bpf_prog *prog); 630 631 /* return true if 'size' wide access at offset 'off' within bpf_context 632 * with 'type' (read or write) is allowed 633 */ 634 bool (*is_valid_access)(int off, int size, enum bpf_access_type type, 635 const struct bpf_prog *prog, 636 struct bpf_insn_access_aux *info); 637 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write, 638 const struct bpf_prog *prog); 639 int (*gen_ld_abs)(const struct bpf_insn *orig, 640 struct bpf_insn *insn_buf); 641 u32 (*convert_ctx_access)(enum bpf_access_type type, 642 const struct bpf_insn *src, 643 struct bpf_insn *dst, 644 struct bpf_prog *prog, u32 *target_size); 645 int (*btf_struct_access)(struct bpf_verifier_log *log, 646 const struct btf *btf, 647 const struct btf_type *t, int off, int size, 648 enum bpf_access_type atype, 649 u32 *next_btf_id, enum bpf_type_flag *flag); 650 }; 651 652 struct bpf_prog_offload_ops { 653 /* verifier basic callbacks */ 654 int (*insn_hook)(struct bpf_verifier_env *env, 655 int insn_idx, int prev_insn_idx); 656 int (*finalize)(struct bpf_verifier_env *env); 657 /* verifier optimization callbacks (called after .finalize) */ 658 int (*replace_insn)(struct bpf_verifier_env *env, u32 off, 659 struct bpf_insn *insn); 660 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt); 661 /* program management callbacks */ 662 int (*prepare)(struct bpf_prog *prog); 663 int (*translate)(struct bpf_prog *prog); 664 void (*destroy)(struct bpf_prog *prog); 665 }; 666 667 struct bpf_prog_offload { 668 struct bpf_prog *prog; 669 struct net_device *netdev; 670 struct bpf_offload_dev *offdev; 671 void *dev_priv; 672 struct list_head offloads; 673 bool dev_state; 674 bool opt_failed; 675 void *jited_image; 676 u32 jited_len; 677 }; 678 679 enum bpf_cgroup_storage_type { 680 BPF_CGROUP_STORAGE_SHARED, 681 BPF_CGROUP_STORAGE_PERCPU, 682 __BPF_CGROUP_STORAGE_MAX 683 }; 684 685 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX 686 687 /* The longest tracepoint has 12 args. 688 * See include/trace/bpf_probe.h 689 */ 690 #define MAX_BPF_FUNC_ARGS 12 691 692 /* The maximum number of arguments passed through registers 693 * a single function may have. 694 */ 695 #define MAX_BPF_FUNC_REG_ARGS 5 696 697 struct btf_func_model { 698 u8 ret_size; 699 u8 nr_args; 700 u8 arg_size[MAX_BPF_FUNC_ARGS]; 701 }; 702 703 /* Restore arguments before returning from trampoline to let original function 704 * continue executing. This flag is used for fentry progs when there are no 705 * fexit progs. 706 */ 707 #define BPF_TRAMP_F_RESTORE_REGS BIT(0) 708 /* Call original function after fentry progs, but before fexit progs. 709 * Makes sense for fentry/fexit, normal calls and indirect calls. 710 */ 711 #define BPF_TRAMP_F_CALL_ORIG BIT(1) 712 /* Skip current frame and return to parent. Makes sense for fentry/fexit 713 * programs only. Should not be used with normal calls and indirect calls. 714 */ 715 #define BPF_TRAMP_F_SKIP_FRAME BIT(2) 716 /* Store IP address of the caller on the trampoline stack, 717 * so it's available for trampoline's programs. 718 */ 719 #define BPF_TRAMP_F_IP_ARG BIT(3) 720 /* Return the return value of fentry prog. Only used by bpf_struct_ops. */ 721 #define BPF_TRAMP_F_RET_FENTRY_RET BIT(4) 722 723 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50 724 * bytes on x86. Pick a number to fit into BPF_IMAGE_SIZE / 2 725 */ 726 #define BPF_MAX_TRAMP_PROGS 38 727 728 struct bpf_tramp_progs { 729 struct bpf_prog *progs[BPF_MAX_TRAMP_PROGS]; 730 int nr_progs; 731 }; 732 733 /* Different use cases for BPF trampoline: 734 * 1. replace nop at the function entry (kprobe equivalent) 735 * flags = BPF_TRAMP_F_RESTORE_REGS 736 * fentry = a set of programs to run before returning from trampoline 737 * 738 * 2. replace nop at the function entry (kprobe + kretprobe equivalent) 739 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME 740 * orig_call = fentry_ip + MCOUNT_INSN_SIZE 741 * fentry = a set of program to run before calling original function 742 * fexit = a set of program to run after original function 743 * 744 * 3. replace direct call instruction anywhere in the function body 745 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid) 746 * With flags = 0 747 * fentry = a set of programs to run before returning from trampoline 748 * With flags = BPF_TRAMP_F_CALL_ORIG 749 * orig_call = original callback addr or direct function addr 750 * fentry = a set of program to run before calling original function 751 * fexit = a set of program to run after original function 752 */ 753 struct bpf_tramp_image; 754 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *tr, void *image, void *image_end, 755 const struct btf_func_model *m, u32 flags, 756 struct bpf_tramp_progs *tprogs, 757 void *orig_call); 758 /* these two functions are called from generated trampoline */ 759 u64 notrace __bpf_prog_enter(struct bpf_prog *prog); 760 void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start); 761 u64 notrace __bpf_prog_enter_sleepable(struct bpf_prog *prog); 762 void notrace __bpf_prog_exit_sleepable(struct bpf_prog *prog, u64 start); 763 void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr); 764 void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr); 765 766 struct bpf_ksym { 767 unsigned long start; 768 unsigned long end; 769 char name[KSYM_NAME_LEN]; 770 struct list_head lnode; 771 struct latch_tree_node tnode; 772 bool prog; 773 }; 774 775 enum bpf_tramp_prog_type { 776 BPF_TRAMP_FENTRY, 777 BPF_TRAMP_FEXIT, 778 BPF_TRAMP_MODIFY_RETURN, 779 BPF_TRAMP_MAX, 780 BPF_TRAMP_REPLACE, /* more than MAX */ 781 }; 782 783 struct bpf_tramp_image { 784 void *image; 785 struct bpf_ksym ksym; 786 struct percpu_ref pcref; 787 void *ip_after_call; 788 void *ip_epilogue; 789 union { 790 struct rcu_head rcu; 791 struct work_struct work; 792 }; 793 }; 794 795 struct bpf_trampoline { 796 /* hlist for trampoline_table */ 797 struct hlist_node hlist; 798 /* serializes access to fields of this trampoline */ 799 struct mutex mutex; 800 refcount_t refcnt; 801 u64 key; 802 struct { 803 struct btf_func_model model; 804 void *addr; 805 bool ftrace_managed; 806 } func; 807 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF 808 * program by replacing one of its functions. func.addr is the address 809 * of the function it replaced. 810 */ 811 struct bpf_prog *extension_prog; 812 /* list of BPF programs using this trampoline */ 813 struct hlist_head progs_hlist[BPF_TRAMP_MAX]; 814 /* Number of attached programs. A counter per kind. */ 815 int progs_cnt[BPF_TRAMP_MAX]; 816 /* Executable image of trampoline */ 817 struct bpf_tramp_image *cur_image; 818 u64 selector; 819 struct module *mod; 820 }; 821 822 struct bpf_attach_target_info { 823 struct btf_func_model fmodel; 824 long tgt_addr; 825 const char *tgt_name; 826 const struct btf_type *tgt_type; 827 }; 828 829 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */ 830 831 struct bpf_dispatcher_prog { 832 struct bpf_prog *prog; 833 refcount_t users; 834 }; 835 836 struct bpf_dispatcher { 837 /* dispatcher mutex */ 838 struct mutex mutex; 839 void *func; 840 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX]; 841 int num_progs; 842 void *image; 843 u32 image_off; 844 struct bpf_ksym ksym; 845 }; 846 847 static __always_inline __nocfi unsigned int bpf_dispatcher_nop_func( 848 const void *ctx, 849 const struct bpf_insn *insnsi, 850 unsigned int (*bpf_func)(const void *, 851 const struct bpf_insn *)) 852 { 853 return bpf_func(ctx, insnsi); 854 } 855 #ifdef CONFIG_BPF_JIT 856 int bpf_trampoline_link_prog(struct bpf_prog *prog, struct bpf_trampoline *tr); 857 int bpf_trampoline_unlink_prog(struct bpf_prog *prog, struct bpf_trampoline *tr); 858 struct bpf_trampoline *bpf_trampoline_get(u64 key, 859 struct bpf_attach_target_info *tgt_info); 860 void bpf_trampoline_put(struct bpf_trampoline *tr); 861 int arch_prepare_bpf_dispatcher(void *image, s64 *funcs, int num_funcs); 862 #define BPF_DISPATCHER_INIT(_name) { \ 863 .mutex = __MUTEX_INITIALIZER(_name.mutex), \ 864 .func = &_name##_func, \ 865 .progs = {}, \ 866 .num_progs = 0, \ 867 .image = NULL, \ 868 .image_off = 0, \ 869 .ksym = { \ 870 .name = #_name, \ 871 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \ 872 }, \ 873 } 874 875 #define DEFINE_BPF_DISPATCHER(name) \ 876 noinline __nocfi unsigned int bpf_dispatcher_##name##_func( \ 877 const void *ctx, \ 878 const struct bpf_insn *insnsi, \ 879 unsigned int (*bpf_func)(const void *, \ 880 const struct bpf_insn *)) \ 881 { \ 882 return bpf_func(ctx, insnsi); \ 883 } \ 884 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \ 885 struct bpf_dispatcher bpf_dispatcher_##name = \ 886 BPF_DISPATCHER_INIT(bpf_dispatcher_##name); 887 #define DECLARE_BPF_DISPATCHER(name) \ 888 unsigned int bpf_dispatcher_##name##_func( \ 889 const void *ctx, \ 890 const struct bpf_insn *insnsi, \ 891 unsigned int (*bpf_func)(const void *, \ 892 const struct bpf_insn *)); \ 893 extern struct bpf_dispatcher bpf_dispatcher_##name; 894 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func 895 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name) 896 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from, 897 struct bpf_prog *to); 898 /* Called only from JIT-enabled code, so there's no need for stubs. */ 899 void *bpf_jit_alloc_exec_page(void); 900 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym); 901 void bpf_image_ksym_del(struct bpf_ksym *ksym); 902 void bpf_ksym_add(struct bpf_ksym *ksym); 903 void bpf_ksym_del(struct bpf_ksym *ksym); 904 int bpf_jit_charge_modmem(u32 size); 905 void bpf_jit_uncharge_modmem(u32 size); 906 bool bpf_prog_has_trampoline(const struct bpf_prog *prog); 907 #else 908 static inline int bpf_trampoline_link_prog(struct bpf_prog *prog, 909 struct bpf_trampoline *tr) 910 { 911 return -ENOTSUPP; 912 } 913 static inline int bpf_trampoline_unlink_prog(struct bpf_prog *prog, 914 struct bpf_trampoline *tr) 915 { 916 return -ENOTSUPP; 917 } 918 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key, 919 struct bpf_attach_target_info *tgt_info) 920 { 921 return ERR_PTR(-EOPNOTSUPP); 922 } 923 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {} 924 #define DEFINE_BPF_DISPATCHER(name) 925 #define DECLARE_BPF_DISPATCHER(name) 926 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func 927 #define BPF_DISPATCHER_PTR(name) NULL 928 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, 929 struct bpf_prog *from, 930 struct bpf_prog *to) {} 931 static inline bool is_bpf_image_address(unsigned long address) 932 { 933 return false; 934 } 935 static inline bool bpf_prog_has_trampoline(const struct bpf_prog *prog) 936 { 937 return false; 938 } 939 #endif 940 941 struct bpf_func_info_aux { 942 u16 linkage; 943 bool unreliable; 944 }; 945 946 enum bpf_jit_poke_reason { 947 BPF_POKE_REASON_TAIL_CALL, 948 }; 949 950 /* Descriptor of pokes pointing /into/ the JITed image. */ 951 struct bpf_jit_poke_descriptor { 952 void *tailcall_target; 953 void *tailcall_bypass; 954 void *bypass_addr; 955 void *aux; 956 union { 957 struct { 958 struct bpf_map *map; 959 u32 key; 960 } tail_call; 961 }; 962 bool tailcall_target_stable; 963 u8 adj_off; 964 u16 reason; 965 u32 insn_idx; 966 }; 967 968 /* reg_type info for ctx arguments */ 969 struct bpf_ctx_arg_aux { 970 u32 offset; 971 enum bpf_reg_type reg_type; 972 u32 btf_id; 973 }; 974 975 struct btf_mod_pair { 976 struct btf *btf; 977 struct module *module; 978 }; 979 980 struct bpf_kfunc_desc_tab; 981 982 struct bpf_prog_aux { 983 atomic64_t refcnt; 984 u32 used_map_cnt; 985 u32 used_btf_cnt; 986 u32 max_ctx_offset; 987 u32 max_pkt_offset; 988 u32 max_tp_access; 989 u32 stack_depth; 990 u32 id; 991 u32 func_cnt; /* used by non-func prog as the number of func progs */ 992 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */ 993 u32 attach_btf_id; /* in-kernel BTF type id to attach to */ 994 u32 ctx_arg_info_size; 995 u32 max_rdonly_access; 996 u32 max_rdwr_access; 997 struct btf *attach_btf; 998 const struct bpf_ctx_arg_aux *ctx_arg_info; 999 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */ 1000 struct bpf_prog *dst_prog; 1001 struct bpf_trampoline *dst_trampoline; 1002 enum bpf_prog_type saved_dst_prog_type; 1003 enum bpf_attach_type saved_dst_attach_type; 1004 bool verifier_zext; /* Zero extensions has been inserted by verifier. */ 1005 bool offload_requested; 1006 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */ 1007 bool func_proto_unreliable; 1008 bool sleepable; 1009 bool tail_call_reachable; 1010 bool xdp_has_frags; 1011 bool use_bpf_prog_pack; 1012 struct hlist_node tramp_hlist; 1013 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */ 1014 const struct btf_type *attach_func_proto; 1015 /* function name for valid attach_btf_id */ 1016 const char *attach_func_name; 1017 struct bpf_prog **func; 1018 void *jit_data; /* JIT specific data. arch dependent */ 1019 struct bpf_jit_poke_descriptor *poke_tab; 1020 struct bpf_kfunc_desc_tab *kfunc_tab; 1021 struct bpf_kfunc_btf_tab *kfunc_btf_tab; 1022 u32 size_poke_tab; 1023 struct bpf_ksym ksym; 1024 const struct bpf_prog_ops *ops; 1025 struct bpf_map **used_maps; 1026 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */ 1027 struct btf_mod_pair *used_btfs; 1028 struct bpf_prog *prog; 1029 struct user_struct *user; 1030 u64 load_time; /* ns since boottime */ 1031 u32 verified_insns; 1032 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]; 1033 char name[BPF_OBJ_NAME_LEN]; 1034 #ifdef CONFIG_SECURITY 1035 void *security; 1036 #endif 1037 struct bpf_prog_offload *offload; 1038 struct btf *btf; 1039 struct bpf_func_info *func_info; 1040 struct bpf_func_info_aux *func_info_aux; 1041 /* bpf_line_info loaded from userspace. linfo->insn_off 1042 * has the xlated insn offset. 1043 * Both the main and sub prog share the same linfo. 1044 * The subprog can access its first linfo by 1045 * using the linfo_idx. 1046 */ 1047 struct bpf_line_info *linfo; 1048 /* jited_linfo is the jited addr of the linfo. It has a 1049 * one to one mapping to linfo: 1050 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off. 1051 * Both the main and sub prog share the same jited_linfo. 1052 * The subprog can access its first jited_linfo by 1053 * using the linfo_idx. 1054 */ 1055 void **jited_linfo; 1056 u32 func_info_cnt; 1057 u32 nr_linfo; 1058 /* subprog can use linfo_idx to access its first linfo and 1059 * jited_linfo. 1060 * main prog always has linfo_idx == 0 1061 */ 1062 u32 linfo_idx; 1063 u32 num_exentries; 1064 struct exception_table_entry *extable; 1065 union { 1066 struct work_struct work; 1067 struct rcu_head rcu; 1068 }; 1069 }; 1070 1071 struct bpf_array_aux { 1072 /* Programs with direct jumps into programs part of this array. */ 1073 struct list_head poke_progs; 1074 struct bpf_map *map; 1075 struct mutex poke_mutex; 1076 struct work_struct work; 1077 }; 1078 1079 struct bpf_link { 1080 atomic64_t refcnt; 1081 u32 id; 1082 enum bpf_link_type type; 1083 const struct bpf_link_ops *ops; 1084 struct bpf_prog *prog; 1085 struct work_struct work; 1086 }; 1087 1088 struct bpf_link_ops { 1089 void (*release)(struct bpf_link *link); 1090 void (*dealloc)(struct bpf_link *link); 1091 int (*detach)(struct bpf_link *link); 1092 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog, 1093 struct bpf_prog *old_prog); 1094 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq); 1095 int (*fill_link_info)(const struct bpf_link *link, 1096 struct bpf_link_info *info); 1097 }; 1098 1099 struct bpf_link_primer { 1100 struct bpf_link *link; 1101 struct file *file; 1102 int fd; 1103 u32 id; 1104 }; 1105 1106 struct bpf_struct_ops_value; 1107 struct btf_member; 1108 1109 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64 1110 struct bpf_struct_ops { 1111 const struct bpf_verifier_ops *verifier_ops; 1112 int (*init)(struct btf *btf); 1113 int (*check_member)(const struct btf_type *t, 1114 const struct btf_member *member); 1115 int (*init_member)(const struct btf_type *t, 1116 const struct btf_member *member, 1117 void *kdata, const void *udata); 1118 int (*reg)(void *kdata); 1119 void (*unreg)(void *kdata); 1120 const struct btf_type *type; 1121 const struct btf_type *value_type; 1122 const char *name; 1123 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS]; 1124 u32 type_id; 1125 u32 value_id; 1126 }; 1127 1128 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL) 1129 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA)) 1130 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id); 1131 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log); 1132 bool bpf_struct_ops_get(const void *kdata); 1133 void bpf_struct_ops_put(const void *kdata); 1134 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key, 1135 void *value); 1136 int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_progs *tprogs, 1137 struct bpf_prog *prog, 1138 const struct btf_func_model *model, 1139 void *image, void *image_end); 1140 static inline bool bpf_try_module_get(const void *data, struct module *owner) 1141 { 1142 if (owner == BPF_MODULE_OWNER) 1143 return bpf_struct_ops_get(data); 1144 else 1145 return try_module_get(owner); 1146 } 1147 static inline void bpf_module_put(const void *data, struct module *owner) 1148 { 1149 if (owner == BPF_MODULE_OWNER) 1150 bpf_struct_ops_put(data); 1151 else 1152 module_put(owner); 1153 } 1154 1155 #ifdef CONFIG_NET 1156 /* Define it here to avoid the use of forward declaration */ 1157 struct bpf_dummy_ops_state { 1158 int val; 1159 }; 1160 1161 struct bpf_dummy_ops { 1162 int (*test_1)(struct bpf_dummy_ops_state *cb); 1163 int (*test_2)(struct bpf_dummy_ops_state *cb, int a1, unsigned short a2, 1164 char a3, unsigned long a4); 1165 }; 1166 1167 int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr, 1168 union bpf_attr __user *uattr); 1169 #endif 1170 #else 1171 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id) 1172 { 1173 return NULL; 1174 } 1175 static inline void bpf_struct_ops_init(struct btf *btf, 1176 struct bpf_verifier_log *log) 1177 { 1178 } 1179 static inline bool bpf_try_module_get(const void *data, struct module *owner) 1180 { 1181 return try_module_get(owner); 1182 } 1183 static inline void bpf_module_put(const void *data, struct module *owner) 1184 { 1185 module_put(owner); 1186 } 1187 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, 1188 void *key, 1189 void *value) 1190 { 1191 return -EINVAL; 1192 } 1193 #endif 1194 1195 struct bpf_array { 1196 struct bpf_map map; 1197 u32 elem_size; 1198 u32 index_mask; 1199 struct bpf_array_aux *aux; 1200 union { 1201 char value[0] __aligned(8); 1202 void *ptrs[0] __aligned(8); 1203 void __percpu *pptrs[0] __aligned(8); 1204 }; 1205 }; 1206 1207 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */ 1208 #define MAX_TAIL_CALL_CNT 33 1209 1210 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \ 1211 BPF_F_RDONLY_PROG | \ 1212 BPF_F_WRONLY | \ 1213 BPF_F_WRONLY_PROG) 1214 1215 #define BPF_MAP_CAN_READ BIT(0) 1216 #define BPF_MAP_CAN_WRITE BIT(1) 1217 1218 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map) 1219 { 1220 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG); 1221 1222 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is 1223 * not possible. 1224 */ 1225 if (access_flags & BPF_F_RDONLY_PROG) 1226 return BPF_MAP_CAN_READ; 1227 else if (access_flags & BPF_F_WRONLY_PROG) 1228 return BPF_MAP_CAN_WRITE; 1229 else 1230 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE; 1231 } 1232 1233 static inline bool bpf_map_flags_access_ok(u32 access_flags) 1234 { 1235 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) != 1236 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG); 1237 } 1238 1239 struct bpf_event_entry { 1240 struct perf_event *event; 1241 struct file *perf_file; 1242 struct file *map_file; 1243 struct rcu_head rcu; 1244 }; 1245 1246 static inline bool map_type_contains_progs(struct bpf_map *map) 1247 { 1248 return map->map_type == BPF_MAP_TYPE_PROG_ARRAY || 1249 map->map_type == BPF_MAP_TYPE_DEVMAP || 1250 map->map_type == BPF_MAP_TYPE_CPUMAP; 1251 } 1252 1253 bool bpf_prog_map_compatible(struct bpf_map *map, const struct bpf_prog *fp); 1254 int bpf_prog_calc_tag(struct bpf_prog *fp); 1255 1256 const struct bpf_func_proto *bpf_get_trace_printk_proto(void); 1257 const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void); 1258 1259 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src, 1260 unsigned long off, unsigned long len); 1261 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type, 1262 const struct bpf_insn *src, 1263 struct bpf_insn *dst, 1264 struct bpf_prog *prog, 1265 u32 *target_size); 1266 1267 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, 1268 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy); 1269 1270 /* an array of programs to be executed under rcu_lock. 1271 * 1272 * Typical usage: 1273 * ret = bpf_prog_run_array(rcu_dereference(&bpf_prog_array), ctx, bpf_prog_run); 1274 * 1275 * the structure returned by bpf_prog_array_alloc() should be populated 1276 * with program pointers and the last pointer must be NULL. 1277 * The user has to keep refcnt on the program and make sure the program 1278 * is removed from the array before bpf_prog_put(). 1279 * The 'struct bpf_prog_array *' should only be replaced with xchg() 1280 * since other cpus are walking the array of pointers in parallel. 1281 */ 1282 struct bpf_prog_array_item { 1283 struct bpf_prog *prog; 1284 union { 1285 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]; 1286 u64 bpf_cookie; 1287 }; 1288 }; 1289 1290 struct bpf_prog_array { 1291 struct rcu_head rcu; 1292 struct bpf_prog_array_item items[]; 1293 }; 1294 1295 struct bpf_empty_prog_array { 1296 struct bpf_prog_array hdr; 1297 struct bpf_prog *null_prog; 1298 }; 1299 1300 /* to avoid allocating empty bpf_prog_array for cgroups that 1301 * don't have bpf program attached use one global 'bpf_empty_prog_array' 1302 * It will not be modified the caller of bpf_prog_array_alloc() 1303 * (since caller requested prog_cnt == 0) 1304 * that pointer should be 'freed' by bpf_prog_array_free() 1305 */ 1306 extern struct bpf_empty_prog_array bpf_empty_prog_array; 1307 1308 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags); 1309 void bpf_prog_array_free(struct bpf_prog_array *progs); 1310 int bpf_prog_array_length(struct bpf_prog_array *progs); 1311 bool bpf_prog_array_is_empty(struct bpf_prog_array *array); 1312 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs, 1313 __u32 __user *prog_ids, u32 cnt); 1314 1315 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs, 1316 struct bpf_prog *old_prog); 1317 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index); 1318 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index, 1319 struct bpf_prog *prog); 1320 int bpf_prog_array_copy_info(struct bpf_prog_array *array, 1321 u32 *prog_ids, u32 request_cnt, 1322 u32 *prog_cnt); 1323 int bpf_prog_array_copy(struct bpf_prog_array *old_array, 1324 struct bpf_prog *exclude_prog, 1325 struct bpf_prog *include_prog, 1326 u64 bpf_cookie, 1327 struct bpf_prog_array **new_array); 1328 1329 struct bpf_run_ctx {}; 1330 1331 struct bpf_cg_run_ctx { 1332 struct bpf_run_ctx run_ctx; 1333 const struct bpf_prog_array_item *prog_item; 1334 int retval; 1335 }; 1336 1337 struct bpf_trace_run_ctx { 1338 struct bpf_run_ctx run_ctx; 1339 u64 bpf_cookie; 1340 }; 1341 1342 static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx) 1343 { 1344 struct bpf_run_ctx *old_ctx = NULL; 1345 1346 #ifdef CONFIG_BPF_SYSCALL 1347 old_ctx = current->bpf_ctx; 1348 current->bpf_ctx = new_ctx; 1349 #endif 1350 return old_ctx; 1351 } 1352 1353 static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx) 1354 { 1355 #ifdef CONFIG_BPF_SYSCALL 1356 current->bpf_ctx = old_ctx; 1357 #endif 1358 } 1359 1360 /* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */ 1361 #define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE (1 << 0) 1362 /* BPF program asks to set CN on the packet. */ 1363 #define BPF_RET_SET_CN (1 << 0) 1364 1365 typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx); 1366 1367 static __always_inline u32 1368 bpf_prog_run_array(const struct bpf_prog_array *array, 1369 const void *ctx, bpf_prog_run_fn run_prog) 1370 { 1371 const struct bpf_prog_array_item *item; 1372 const struct bpf_prog *prog; 1373 struct bpf_run_ctx *old_run_ctx; 1374 struct bpf_trace_run_ctx run_ctx; 1375 u32 ret = 1; 1376 1377 RCU_LOCKDEP_WARN(!rcu_read_lock_held(), "no rcu lock held"); 1378 1379 if (unlikely(!array)) 1380 return ret; 1381 1382 migrate_disable(); 1383 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx); 1384 item = &array->items[0]; 1385 while ((prog = READ_ONCE(item->prog))) { 1386 run_ctx.bpf_cookie = item->bpf_cookie; 1387 ret &= run_prog(prog, ctx); 1388 item++; 1389 } 1390 bpf_reset_run_ctx(old_run_ctx); 1391 migrate_enable(); 1392 return ret; 1393 } 1394 1395 #ifdef CONFIG_BPF_SYSCALL 1396 DECLARE_PER_CPU(int, bpf_prog_active); 1397 extern struct mutex bpf_stats_enabled_mutex; 1398 1399 /* 1400 * Block execution of BPF programs attached to instrumentation (perf, 1401 * kprobes, tracepoints) to prevent deadlocks on map operations as any of 1402 * these events can happen inside a region which holds a map bucket lock 1403 * and can deadlock on it. 1404 */ 1405 static inline void bpf_disable_instrumentation(void) 1406 { 1407 migrate_disable(); 1408 this_cpu_inc(bpf_prog_active); 1409 } 1410 1411 static inline void bpf_enable_instrumentation(void) 1412 { 1413 this_cpu_dec(bpf_prog_active); 1414 migrate_enable(); 1415 } 1416 1417 extern const struct file_operations bpf_map_fops; 1418 extern const struct file_operations bpf_prog_fops; 1419 extern const struct file_operations bpf_iter_fops; 1420 1421 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \ 1422 extern const struct bpf_prog_ops _name ## _prog_ops; \ 1423 extern const struct bpf_verifier_ops _name ## _verifier_ops; 1424 #define BPF_MAP_TYPE(_id, _ops) \ 1425 extern const struct bpf_map_ops _ops; 1426 #define BPF_LINK_TYPE(_id, _name) 1427 #include <linux/bpf_types.h> 1428 #undef BPF_PROG_TYPE 1429 #undef BPF_MAP_TYPE 1430 #undef BPF_LINK_TYPE 1431 1432 extern const struct bpf_prog_ops bpf_offload_prog_ops; 1433 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops; 1434 extern const struct bpf_verifier_ops xdp_analyzer_ops; 1435 1436 struct bpf_prog *bpf_prog_get(u32 ufd); 1437 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, 1438 bool attach_drv); 1439 void bpf_prog_add(struct bpf_prog *prog, int i); 1440 void bpf_prog_sub(struct bpf_prog *prog, int i); 1441 void bpf_prog_inc(struct bpf_prog *prog); 1442 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog); 1443 void bpf_prog_put(struct bpf_prog *prog); 1444 1445 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock); 1446 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock); 1447 1448 struct bpf_map_value_off_desc *bpf_map_kptr_off_contains(struct bpf_map *map, u32 offset); 1449 void bpf_map_free_kptr_off_tab(struct bpf_map *map); 1450 struct bpf_map_value_off *bpf_map_copy_kptr_off_tab(const struct bpf_map *map); 1451 bool bpf_map_equal_kptr_off_tab(const struct bpf_map *map_a, const struct bpf_map *map_b); 1452 void bpf_map_free_kptrs(struct bpf_map *map, void *map_value); 1453 1454 struct bpf_map *bpf_map_get(u32 ufd); 1455 struct bpf_map *bpf_map_get_with_uref(u32 ufd); 1456 struct bpf_map *__bpf_map_get(struct fd f); 1457 void bpf_map_inc(struct bpf_map *map); 1458 void bpf_map_inc_with_uref(struct bpf_map *map); 1459 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map); 1460 void bpf_map_put_with_uref(struct bpf_map *map); 1461 void bpf_map_put(struct bpf_map *map); 1462 void *bpf_map_area_alloc(u64 size, int numa_node); 1463 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node); 1464 void bpf_map_area_free(void *base); 1465 bool bpf_map_write_active(const struct bpf_map *map); 1466 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr); 1467 int generic_map_lookup_batch(struct bpf_map *map, 1468 const union bpf_attr *attr, 1469 union bpf_attr __user *uattr); 1470 int generic_map_update_batch(struct bpf_map *map, 1471 const union bpf_attr *attr, 1472 union bpf_attr __user *uattr); 1473 int generic_map_delete_batch(struct bpf_map *map, 1474 const union bpf_attr *attr, 1475 union bpf_attr __user *uattr); 1476 struct bpf_map *bpf_map_get_curr_or_next(u32 *id); 1477 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id); 1478 1479 #ifdef CONFIG_MEMCG_KMEM 1480 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags, 1481 int node); 1482 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags); 1483 void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, 1484 size_t align, gfp_t flags); 1485 #else 1486 static inline void * 1487 bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags, 1488 int node) 1489 { 1490 return kmalloc_node(size, flags, node); 1491 } 1492 1493 static inline void * 1494 bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags) 1495 { 1496 return kzalloc(size, flags); 1497 } 1498 1499 static inline void __percpu * 1500 bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, size_t align, 1501 gfp_t flags) 1502 { 1503 return __alloc_percpu_gfp(size, align, flags); 1504 } 1505 #endif 1506 1507 extern int sysctl_unprivileged_bpf_disabled; 1508 1509 static inline bool bpf_allow_ptr_leaks(void) 1510 { 1511 return perfmon_capable(); 1512 } 1513 1514 static inline bool bpf_allow_uninit_stack(void) 1515 { 1516 return perfmon_capable(); 1517 } 1518 1519 static inline bool bpf_allow_ptr_to_map_access(void) 1520 { 1521 return perfmon_capable(); 1522 } 1523 1524 static inline bool bpf_bypass_spec_v1(void) 1525 { 1526 return perfmon_capable(); 1527 } 1528 1529 static inline bool bpf_bypass_spec_v4(void) 1530 { 1531 return perfmon_capable(); 1532 } 1533 1534 int bpf_map_new_fd(struct bpf_map *map, int flags); 1535 int bpf_prog_new_fd(struct bpf_prog *prog); 1536 1537 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type, 1538 const struct bpf_link_ops *ops, struct bpf_prog *prog); 1539 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer); 1540 int bpf_link_settle(struct bpf_link_primer *primer); 1541 void bpf_link_cleanup(struct bpf_link_primer *primer); 1542 void bpf_link_inc(struct bpf_link *link); 1543 void bpf_link_put(struct bpf_link *link); 1544 int bpf_link_new_fd(struct bpf_link *link); 1545 struct file *bpf_link_new_file(struct bpf_link *link, int *reserved_fd); 1546 struct bpf_link *bpf_link_get_from_fd(u32 ufd); 1547 1548 int bpf_obj_pin_user(u32 ufd, const char __user *pathname); 1549 int bpf_obj_get_user(const char __user *pathname, int flags); 1550 1551 #define BPF_ITER_FUNC_PREFIX "bpf_iter_" 1552 #define DEFINE_BPF_ITER_FUNC(target, args...) \ 1553 extern int bpf_iter_ ## target(args); \ 1554 int __init bpf_iter_ ## target(args) { return 0; } 1555 1556 struct bpf_iter_aux_info { 1557 struct bpf_map *map; 1558 }; 1559 1560 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog, 1561 union bpf_iter_link_info *linfo, 1562 struct bpf_iter_aux_info *aux); 1563 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux); 1564 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux, 1565 struct seq_file *seq); 1566 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux, 1567 struct bpf_link_info *info); 1568 typedef const struct bpf_func_proto * 1569 (*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id, 1570 const struct bpf_prog *prog); 1571 1572 enum bpf_iter_feature { 1573 BPF_ITER_RESCHED = BIT(0), 1574 }; 1575 1576 #define BPF_ITER_CTX_ARG_MAX 2 1577 struct bpf_iter_reg { 1578 const char *target; 1579 bpf_iter_attach_target_t attach_target; 1580 bpf_iter_detach_target_t detach_target; 1581 bpf_iter_show_fdinfo_t show_fdinfo; 1582 bpf_iter_fill_link_info_t fill_link_info; 1583 bpf_iter_get_func_proto_t get_func_proto; 1584 u32 ctx_arg_info_size; 1585 u32 feature; 1586 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX]; 1587 const struct bpf_iter_seq_info *seq_info; 1588 }; 1589 1590 struct bpf_iter_meta { 1591 __bpf_md_ptr(struct seq_file *, seq); 1592 u64 session_id; 1593 u64 seq_num; 1594 }; 1595 1596 struct bpf_iter__bpf_map_elem { 1597 __bpf_md_ptr(struct bpf_iter_meta *, meta); 1598 __bpf_md_ptr(struct bpf_map *, map); 1599 __bpf_md_ptr(void *, key); 1600 __bpf_md_ptr(void *, value); 1601 }; 1602 1603 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info); 1604 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info); 1605 bool bpf_iter_prog_supported(struct bpf_prog *prog); 1606 const struct bpf_func_proto * 1607 bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog); 1608 int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog); 1609 int bpf_iter_new_fd(struct bpf_link *link); 1610 bool bpf_link_is_iter(struct bpf_link *link); 1611 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop); 1612 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx); 1613 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux, 1614 struct seq_file *seq); 1615 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux, 1616 struct bpf_link_info *info); 1617 1618 int map_set_for_each_callback_args(struct bpf_verifier_env *env, 1619 struct bpf_func_state *caller, 1620 struct bpf_func_state *callee); 1621 1622 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value); 1623 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value); 1624 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value, 1625 u64 flags); 1626 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value, 1627 u64 flags); 1628 1629 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value); 1630 1631 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file, 1632 void *key, void *value, u64 map_flags); 1633 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 1634 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file, 1635 void *key, void *value, u64 map_flags); 1636 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 1637 1638 int bpf_get_file_flag(int flags); 1639 int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size, 1640 size_t actual_size); 1641 1642 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and 1643 * forced to use 'long' read/writes to try to atomically copy long counters. 1644 * Best-effort only. No barriers here, since it _will_ race with concurrent 1645 * updates from BPF programs. Called from bpf syscall and mostly used with 1646 * size 8 or 16 bytes, so ask compiler to inline it. 1647 */ 1648 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size) 1649 { 1650 const long *lsrc = src; 1651 long *ldst = dst; 1652 1653 size /= sizeof(long); 1654 while (size--) 1655 *ldst++ = *lsrc++; 1656 } 1657 1658 /* verify correctness of eBPF program */ 1659 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr); 1660 1661 #ifndef CONFIG_BPF_JIT_ALWAYS_ON 1662 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth); 1663 #endif 1664 1665 struct btf *bpf_get_btf_vmlinux(void); 1666 1667 /* Map specifics */ 1668 struct xdp_frame; 1669 struct sk_buff; 1670 struct bpf_dtab_netdev; 1671 struct bpf_cpu_map_entry; 1672 1673 void __dev_flush(void); 1674 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf, 1675 struct net_device *dev_rx); 1676 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf, 1677 struct net_device *dev_rx); 1678 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx, 1679 struct bpf_map *map, bool exclude_ingress); 1680 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb, 1681 struct bpf_prog *xdp_prog); 1682 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb, 1683 struct bpf_prog *xdp_prog, struct bpf_map *map, 1684 bool exclude_ingress); 1685 1686 void __cpu_map_flush(void); 1687 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf, 1688 struct net_device *dev_rx); 1689 int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu, 1690 struct sk_buff *skb); 1691 1692 /* Return map's numa specified by userspace */ 1693 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr) 1694 { 1695 return (attr->map_flags & BPF_F_NUMA_NODE) ? 1696 attr->numa_node : NUMA_NO_NODE; 1697 } 1698 1699 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type); 1700 int array_map_alloc_check(union bpf_attr *attr); 1701 1702 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, 1703 union bpf_attr __user *uattr); 1704 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, 1705 union bpf_attr __user *uattr); 1706 int bpf_prog_test_run_tracing(struct bpf_prog *prog, 1707 const union bpf_attr *kattr, 1708 union bpf_attr __user *uattr); 1709 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, 1710 const union bpf_attr *kattr, 1711 union bpf_attr __user *uattr); 1712 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog, 1713 const union bpf_attr *kattr, 1714 union bpf_attr __user *uattr); 1715 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog, 1716 const union bpf_attr *kattr, 1717 union bpf_attr __user *uattr); 1718 bool btf_ctx_access(int off, int size, enum bpf_access_type type, 1719 const struct bpf_prog *prog, 1720 struct bpf_insn_access_aux *info); 1721 1722 static inline bool bpf_tracing_ctx_access(int off, int size, 1723 enum bpf_access_type type) 1724 { 1725 if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS) 1726 return false; 1727 if (type != BPF_READ) 1728 return false; 1729 if (off % size != 0) 1730 return false; 1731 return true; 1732 } 1733 1734 static inline bool bpf_tracing_btf_ctx_access(int off, int size, 1735 enum bpf_access_type type, 1736 const struct bpf_prog *prog, 1737 struct bpf_insn_access_aux *info) 1738 { 1739 if (!bpf_tracing_ctx_access(off, size, type)) 1740 return false; 1741 return btf_ctx_access(off, size, type, prog, info); 1742 } 1743 1744 int btf_struct_access(struct bpf_verifier_log *log, const struct btf *btf, 1745 const struct btf_type *t, int off, int size, 1746 enum bpf_access_type atype, 1747 u32 *next_btf_id, enum bpf_type_flag *flag); 1748 bool btf_struct_ids_match(struct bpf_verifier_log *log, 1749 const struct btf *btf, u32 id, int off, 1750 const struct btf *need_btf, u32 need_type_id, 1751 bool strict); 1752 1753 int btf_distill_func_proto(struct bpf_verifier_log *log, 1754 struct btf *btf, 1755 const struct btf_type *func_proto, 1756 const char *func_name, 1757 struct btf_func_model *m); 1758 1759 struct bpf_reg_state; 1760 int btf_check_subprog_arg_match(struct bpf_verifier_env *env, int subprog, 1761 struct bpf_reg_state *regs); 1762 int btf_check_kfunc_arg_match(struct bpf_verifier_env *env, 1763 const struct btf *btf, u32 func_id, 1764 struct bpf_reg_state *regs); 1765 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog, 1766 struct bpf_reg_state *reg); 1767 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog, 1768 struct btf *btf, const struct btf_type *t); 1769 1770 struct bpf_prog *bpf_prog_by_id(u32 id); 1771 struct bpf_link *bpf_link_by_id(u32 id); 1772 1773 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id); 1774 void bpf_task_storage_free(struct task_struct *task); 1775 bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog); 1776 const struct btf_func_model * 1777 bpf_jit_find_kfunc_model(const struct bpf_prog *prog, 1778 const struct bpf_insn *insn); 1779 struct bpf_core_ctx { 1780 struct bpf_verifier_log *log; 1781 const struct btf *btf; 1782 }; 1783 1784 int bpf_core_apply(struct bpf_core_ctx *ctx, const struct bpf_core_relo *relo, 1785 int relo_idx, void *insn); 1786 1787 static inline bool unprivileged_ebpf_enabled(void) 1788 { 1789 return !sysctl_unprivileged_bpf_disabled; 1790 } 1791 1792 #else /* !CONFIG_BPF_SYSCALL */ 1793 static inline struct bpf_prog *bpf_prog_get(u32 ufd) 1794 { 1795 return ERR_PTR(-EOPNOTSUPP); 1796 } 1797 1798 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, 1799 enum bpf_prog_type type, 1800 bool attach_drv) 1801 { 1802 return ERR_PTR(-EOPNOTSUPP); 1803 } 1804 1805 static inline void bpf_prog_add(struct bpf_prog *prog, int i) 1806 { 1807 } 1808 1809 static inline void bpf_prog_sub(struct bpf_prog *prog, int i) 1810 { 1811 } 1812 1813 static inline void bpf_prog_put(struct bpf_prog *prog) 1814 { 1815 } 1816 1817 static inline void bpf_prog_inc(struct bpf_prog *prog) 1818 { 1819 } 1820 1821 static inline struct bpf_prog *__must_check 1822 bpf_prog_inc_not_zero(struct bpf_prog *prog) 1823 { 1824 return ERR_PTR(-EOPNOTSUPP); 1825 } 1826 1827 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type, 1828 const struct bpf_link_ops *ops, 1829 struct bpf_prog *prog) 1830 { 1831 } 1832 1833 static inline int bpf_link_prime(struct bpf_link *link, 1834 struct bpf_link_primer *primer) 1835 { 1836 return -EOPNOTSUPP; 1837 } 1838 1839 static inline int bpf_link_settle(struct bpf_link_primer *primer) 1840 { 1841 return -EOPNOTSUPP; 1842 } 1843 1844 static inline void bpf_link_cleanup(struct bpf_link_primer *primer) 1845 { 1846 } 1847 1848 static inline void bpf_link_inc(struct bpf_link *link) 1849 { 1850 } 1851 1852 static inline void bpf_link_put(struct bpf_link *link) 1853 { 1854 } 1855 1856 static inline int bpf_obj_get_user(const char __user *pathname, int flags) 1857 { 1858 return -EOPNOTSUPP; 1859 } 1860 1861 static inline void __dev_flush(void) 1862 { 1863 } 1864 1865 struct xdp_frame; 1866 struct bpf_dtab_netdev; 1867 struct bpf_cpu_map_entry; 1868 1869 static inline 1870 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf, 1871 struct net_device *dev_rx) 1872 { 1873 return 0; 1874 } 1875 1876 static inline 1877 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf, 1878 struct net_device *dev_rx) 1879 { 1880 return 0; 1881 } 1882 1883 static inline 1884 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx, 1885 struct bpf_map *map, bool exclude_ingress) 1886 { 1887 return 0; 1888 } 1889 1890 struct sk_buff; 1891 1892 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, 1893 struct sk_buff *skb, 1894 struct bpf_prog *xdp_prog) 1895 { 1896 return 0; 1897 } 1898 1899 static inline 1900 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb, 1901 struct bpf_prog *xdp_prog, struct bpf_map *map, 1902 bool exclude_ingress) 1903 { 1904 return 0; 1905 } 1906 1907 static inline void __cpu_map_flush(void) 1908 { 1909 } 1910 1911 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, 1912 struct xdp_frame *xdpf, 1913 struct net_device *dev_rx) 1914 { 1915 return 0; 1916 } 1917 1918 static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu, 1919 struct sk_buff *skb) 1920 { 1921 return -EOPNOTSUPP; 1922 } 1923 1924 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name, 1925 enum bpf_prog_type type) 1926 { 1927 return ERR_PTR(-EOPNOTSUPP); 1928 } 1929 1930 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog, 1931 const union bpf_attr *kattr, 1932 union bpf_attr __user *uattr) 1933 { 1934 return -ENOTSUPP; 1935 } 1936 1937 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog, 1938 const union bpf_attr *kattr, 1939 union bpf_attr __user *uattr) 1940 { 1941 return -ENOTSUPP; 1942 } 1943 1944 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog, 1945 const union bpf_attr *kattr, 1946 union bpf_attr __user *uattr) 1947 { 1948 return -ENOTSUPP; 1949 } 1950 1951 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, 1952 const union bpf_attr *kattr, 1953 union bpf_attr __user *uattr) 1954 { 1955 return -ENOTSUPP; 1956 } 1957 1958 static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog, 1959 const union bpf_attr *kattr, 1960 union bpf_attr __user *uattr) 1961 { 1962 return -ENOTSUPP; 1963 } 1964 1965 static inline void bpf_map_put(struct bpf_map *map) 1966 { 1967 } 1968 1969 static inline struct bpf_prog *bpf_prog_by_id(u32 id) 1970 { 1971 return ERR_PTR(-ENOTSUPP); 1972 } 1973 1974 static inline const struct bpf_func_proto * 1975 bpf_base_func_proto(enum bpf_func_id func_id) 1976 { 1977 return NULL; 1978 } 1979 1980 static inline void bpf_task_storage_free(struct task_struct *task) 1981 { 1982 } 1983 1984 static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog) 1985 { 1986 return false; 1987 } 1988 1989 static inline const struct btf_func_model * 1990 bpf_jit_find_kfunc_model(const struct bpf_prog *prog, 1991 const struct bpf_insn *insn) 1992 { 1993 return NULL; 1994 } 1995 1996 static inline bool unprivileged_ebpf_enabled(void) 1997 { 1998 return false; 1999 } 2000 2001 #endif /* CONFIG_BPF_SYSCALL */ 2002 2003 void __bpf_free_used_btfs(struct bpf_prog_aux *aux, 2004 struct btf_mod_pair *used_btfs, u32 len); 2005 2006 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd, 2007 enum bpf_prog_type type) 2008 { 2009 return bpf_prog_get_type_dev(ufd, type, false); 2010 } 2011 2012 void __bpf_free_used_maps(struct bpf_prog_aux *aux, 2013 struct bpf_map **used_maps, u32 len); 2014 2015 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool); 2016 2017 int bpf_prog_offload_compile(struct bpf_prog *prog); 2018 void bpf_prog_offload_destroy(struct bpf_prog *prog); 2019 int bpf_prog_offload_info_fill(struct bpf_prog_info *info, 2020 struct bpf_prog *prog); 2021 2022 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map); 2023 2024 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value); 2025 int bpf_map_offload_update_elem(struct bpf_map *map, 2026 void *key, void *value, u64 flags); 2027 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key); 2028 int bpf_map_offload_get_next_key(struct bpf_map *map, 2029 void *key, void *next_key); 2030 2031 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map); 2032 2033 struct bpf_offload_dev * 2034 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv); 2035 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev); 2036 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev); 2037 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev, 2038 struct net_device *netdev); 2039 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev, 2040 struct net_device *netdev); 2041 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev); 2042 2043 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL) 2044 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr); 2045 2046 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux) 2047 { 2048 return aux->offload_requested; 2049 } 2050 2051 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 2052 { 2053 return unlikely(map->ops == &bpf_map_offload_ops); 2054 } 2055 2056 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr); 2057 void bpf_map_offload_map_free(struct bpf_map *map); 2058 int bpf_prog_test_run_syscall(struct bpf_prog *prog, 2059 const union bpf_attr *kattr, 2060 union bpf_attr __user *uattr); 2061 2062 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog); 2063 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype); 2064 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags); 2065 int sock_map_bpf_prog_query(const union bpf_attr *attr, 2066 union bpf_attr __user *uattr); 2067 2068 void sock_map_unhash(struct sock *sk); 2069 void sock_map_close(struct sock *sk, long timeout); 2070 #else 2071 static inline int bpf_prog_offload_init(struct bpf_prog *prog, 2072 union bpf_attr *attr) 2073 { 2074 return -EOPNOTSUPP; 2075 } 2076 2077 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux) 2078 { 2079 return false; 2080 } 2081 2082 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 2083 { 2084 return false; 2085 } 2086 2087 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr) 2088 { 2089 return ERR_PTR(-EOPNOTSUPP); 2090 } 2091 2092 static inline void bpf_map_offload_map_free(struct bpf_map *map) 2093 { 2094 } 2095 2096 static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog, 2097 const union bpf_attr *kattr, 2098 union bpf_attr __user *uattr) 2099 { 2100 return -ENOTSUPP; 2101 } 2102 2103 #ifdef CONFIG_BPF_SYSCALL 2104 static inline int sock_map_get_from_fd(const union bpf_attr *attr, 2105 struct bpf_prog *prog) 2106 { 2107 return -EINVAL; 2108 } 2109 2110 static inline int sock_map_prog_detach(const union bpf_attr *attr, 2111 enum bpf_prog_type ptype) 2112 { 2113 return -EOPNOTSUPP; 2114 } 2115 2116 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, 2117 u64 flags) 2118 { 2119 return -EOPNOTSUPP; 2120 } 2121 2122 static inline int sock_map_bpf_prog_query(const union bpf_attr *attr, 2123 union bpf_attr __user *uattr) 2124 { 2125 return -EINVAL; 2126 } 2127 #endif /* CONFIG_BPF_SYSCALL */ 2128 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */ 2129 2130 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) 2131 void bpf_sk_reuseport_detach(struct sock *sk); 2132 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key, 2133 void *value); 2134 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key, 2135 void *value, u64 map_flags); 2136 #else 2137 static inline void bpf_sk_reuseport_detach(struct sock *sk) 2138 { 2139 } 2140 2141 #ifdef CONFIG_BPF_SYSCALL 2142 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, 2143 void *key, void *value) 2144 { 2145 return -EOPNOTSUPP; 2146 } 2147 2148 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, 2149 void *key, void *value, 2150 u64 map_flags) 2151 { 2152 return -EOPNOTSUPP; 2153 } 2154 #endif /* CONFIG_BPF_SYSCALL */ 2155 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */ 2156 2157 /* verifier prototypes for helper functions called from eBPF programs */ 2158 extern const struct bpf_func_proto bpf_map_lookup_elem_proto; 2159 extern const struct bpf_func_proto bpf_map_update_elem_proto; 2160 extern const struct bpf_func_proto bpf_map_delete_elem_proto; 2161 extern const struct bpf_func_proto bpf_map_push_elem_proto; 2162 extern const struct bpf_func_proto bpf_map_pop_elem_proto; 2163 extern const struct bpf_func_proto bpf_map_peek_elem_proto; 2164 2165 extern const struct bpf_func_proto bpf_get_prandom_u32_proto; 2166 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto; 2167 extern const struct bpf_func_proto bpf_get_numa_node_id_proto; 2168 extern const struct bpf_func_proto bpf_tail_call_proto; 2169 extern const struct bpf_func_proto bpf_ktime_get_ns_proto; 2170 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto; 2171 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto; 2172 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto; 2173 extern const struct bpf_func_proto bpf_get_current_comm_proto; 2174 extern const struct bpf_func_proto bpf_get_stackid_proto; 2175 extern const struct bpf_func_proto bpf_get_stack_proto; 2176 extern const struct bpf_func_proto bpf_get_task_stack_proto; 2177 extern const struct bpf_func_proto bpf_get_stackid_proto_pe; 2178 extern const struct bpf_func_proto bpf_get_stack_proto_pe; 2179 extern const struct bpf_func_proto bpf_sock_map_update_proto; 2180 extern const struct bpf_func_proto bpf_sock_hash_update_proto; 2181 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto; 2182 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto; 2183 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto; 2184 extern const struct bpf_func_proto bpf_msg_redirect_map_proto; 2185 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto; 2186 extern const struct bpf_func_proto bpf_sk_redirect_map_proto; 2187 extern const struct bpf_func_proto bpf_spin_lock_proto; 2188 extern const struct bpf_func_proto bpf_spin_unlock_proto; 2189 extern const struct bpf_func_proto bpf_get_local_storage_proto; 2190 extern const struct bpf_func_proto bpf_strtol_proto; 2191 extern const struct bpf_func_proto bpf_strtoul_proto; 2192 extern const struct bpf_func_proto bpf_tcp_sock_proto; 2193 extern const struct bpf_func_proto bpf_jiffies64_proto; 2194 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto; 2195 extern const struct bpf_func_proto bpf_event_output_data_proto; 2196 extern const struct bpf_func_proto bpf_ringbuf_output_proto; 2197 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto; 2198 extern const struct bpf_func_proto bpf_ringbuf_submit_proto; 2199 extern const struct bpf_func_proto bpf_ringbuf_discard_proto; 2200 extern const struct bpf_func_proto bpf_ringbuf_query_proto; 2201 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto; 2202 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto; 2203 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto; 2204 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto; 2205 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto; 2206 extern const struct bpf_func_proto bpf_skc_to_unix_sock_proto; 2207 extern const struct bpf_func_proto bpf_copy_from_user_proto; 2208 extern const struct bpf_func_proto bpf_snprintf_btf_proto; 2209 extern const struct bpf_func_proto bpf_snprintf_proto; 2210 extern const struct bpf_func_proto bpf_per_cpu_ptr_proto; 2211 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto; 2212 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto; 2213 extern const struct bpf_func_proto bpf_sock_from_file_proto; 2214 extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto; 2215 extern const struct bpf_func_proto bpf_task_storage_get_proto; 2216 extern const struct bpf_func_proto bpf_task_storage_delete_proto; 2217 extern const struct bpf_func_proto bpf_for_each_map_elem_proto; 2218 extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto; 2219 extern const struct bpf_func_proto bpf_sk_setsockopt_proto; 2220 extern const struct bpf_func_proto bpf_sk_getsockopt_proto; 2221 extern const struct bpf_func_proto bpf_kallsyms_lookup_name_proto; 2222 extern const struct bpf_func_proto bpf_find_vma_proto; 2223 extern const struct bpf_func_proto bpf_loop_proto; 2224 extern const struct bpf_func_proto bpf_strncmp_proto; 2225 extern const struct bpf_func_proto bpf_copy_from_user_task_proto; 2226 2227 const struct bpf_func_proto *tracing_prog_func_proto( 2228 enum bpf_func_id func_id, const struct bpf_prog *prog); 2229 2230 /* Shared helpers among cBPF and eBPF. */ 2231 void bpf_user_rnd_init_once(void); 2232 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 2233 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 2234 2235 #if defined(CONFIG_NET) 2236 bool bpf_sock_common_is_valid_access(int off, int size, 2237 enum bpf_access_type type, 2238 struct bpf_insn_access_aux *info); 2239 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type, 2240 struct bpf_insn_access_aux *info); 2241 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 2242 const struct bpf_insn *si, 2243 struct bpf_insn *insn_buf, 2244 struct bpf_prog *prog, 2245 u32 *target_size); 2246 #else 2247 static inline bool bpf_sock_common_is_valid_access(int off, int size, 2248 enum bpf_access_type type, 2249 struct bpf_insn_access_aux *info) 2250 { 2251 return false; 2252 } 2253 static inline bool bpf_sock_is_valid_access(int off, int size, 2254 enum bpf_access_type type, 2255 struct bpf_insn_access_aux *info) 2256 { 2257 return false; 2258 } 2259 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 2260 const struct bpf_insn *si, 2261 struct bpf_insn *insn_buf, 2262 struct bpf_prog *prog, 2263 u32 *target_size) 2264 { 2265 return 0; 2266 } 2267 #endif 2268 2269 #ifdef CONFIG_INET 2270 struct sk_reuseport_kern { 2271 struct sk_buff *skb; 2272 struct sock *sk; 2273 struct sock *selected_sk; 2274 struct sock *migrating_sk; 2275 void *data_end; 2276 u32 hash; 2277 u32 reuseport_id; 2278 bool bind_inany; 2279 }; 2280 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 2281 struct bpf_insn_access_aux *info); 2282 2283 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, 2284 const struct bpf_insn *si, 2285 struct bpf_insn *insn_buf, 2286 struct bpf_prog *prog, 2287 u32 *target_size); 2288 2289 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 2290 struct bpf_insn_access_aux *info); 2291 2292 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, 2293 const struct bpf_insn *si, 2294 struct bpf_insn *insn_buf, 2295 struct bpf_prog *prog, 2296 u32 *target_size); 2297 #else 2298 static inline bool bpf_tcp_sock_is_valid_access(int off, int size, 2299 enum bpf_access_type type, 2300 struct bpf_insn_access_aux *info) 2301 { 2302 return false; 2303 } 2304 2305 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, 2306 const struct bpf_insn *si, 2307 struct bpf_insn *insn_buf, 2308 struct bpf_prog *prog, 2309 u32 *target_size) 2310 { 2311 return 0; 2312 } 2313 static inline bool bpf_xdp_sock_is_valid_access(int off, int size, 2314 enum bpf_access_type type, 2315 struct bpf_insn_access_aux *info) 2316 { 2317 return false; 2318 } 2319 2320 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, 2321 const struct bpf_insn *si, 2322 struct bpf_insn *insn_buf, 2323 struct bpf_prog *prog, 2324 u32 *target_size) 2325 { 2326 return 0; 2327 } 2328 #endif /* CONFIG_INET */ 2329 2330 enum bpf_text_poke_type { 2331 BPF_MOD_CALL, 2332 BPF_MOD_JUMP, 2333 }; 2334 2335 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t, 2336 void *addr1, void *addr2); 2337 2338 void *bpf_arch_text_copy(void *dst, void *src, size_t len); 2339 2340 struct btf_id_set; 2341 bool btf_id_set_contains(const struct btf_id_set *set, u32 id); 2342 2343 #define MAX_BPRINTF_VARARGS 12 2344 2345 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args, 2346 u32 **bin_buf, u32 num_args); 2347 void bpf_bprintf_cleanup(void); 2348 2349 #endif /* _LINUX_BPF_H */ 2350