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 void *(*map_lookup_percpu_elem)(struct bpf_map *map, void *key, u32 cpu); 93 94 /* funcs called by prog_array and perf_event_array map */ 95 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file, 96 int fd); 97 void (*map_fd_put_ptr)(void *ptr); 98 int (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf); 99 u32 (*map_fd_sys_lookup_elem)(void *ptr); 100 void (*map_seq_show_elem)(struct bpf_map *map, void *key, 101 struct seq_file *m); 102 int (*map_check_btf)(const struct bpf_map *map, 103 const struct btf *btf, 104 const struct btf_type *key_type, 105 const struct btf_type *value_type); 106 107 /* Prog poke tracking helpers. */ 108 int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux); 109 void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux); 110 void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old, 111 struct bpf_prog *new); 112 113 /* Direct value access helpers. */ 114 int (*map_direct_value_addr)(const struct bpf_map *map, 115 u64 *imm, u32 off); 116 int (*map_direct_value_meta)(const struct bpf_map *map, 117 u64 imm, u32 *off); 118 int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma); 119 __poll_t (*map_poll)(struct bpf_map *map, struct file *filp, 120 struct poll_table_struct *pts); 121 122 /* Functions called by bpf_local_storage maps */ 123 int (*map_local_storage_charge)(struct bpf_local_storage_map *smap, 124 void *owner, u32 size); 125 void (*map_local_storage_uncharge)(struct bpf_local_storage_map *smap, 126 void *owner, u32 size); 127 struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner); 128 129 /* Misc helpers.*/ 130 int (*map_redirect)(struct bpf_map *map, u32 ifindex, u64 flags); 131 132 /* map_meta_equal must be implemented for maps that can be 133 * used as an inner map. It is a runtime check to ensure 134 * an inner map can be inserted to an outer map. 135 * 136 * Some properties of the inner map has been used during the 137 * verification time. When inserting an inner map at the runtime, 138 * map_meta_equal has to ensure the inserting map has the same 139 * properties that the verifier has used earlier. 140 */ 141 bool (*map_meta_equal)(const struct bpf_map *meta0, 142 const struct bpf_map *meta1); 143 144 145 int (*map_set_for_each_callback_args)(struct bpf_verifier_env *env, 146 struct bpf_func_state *caller, 147 struct bpf_func_state *callee); 148 int (*map_for_each_callback)(struct bpf_map *map, 149 bpf_callback_t callback_fn, 150 void *callback_ctx, u64 flags); 151 152 /* BTF id of struct allocated by map_alloc */ 153 int *map_btf_id; 154 155 /* bpf_iter info used to open a seq_file */ 156 const struct bpf_iter_seq_info *iter_seq_info; 157 }; 158 159 enum { 160 /* Support at most 8 pointers in a BPF map value */ 161 BPF_MAP_VALUE_OFF_MAX = 8, 162 BPF_MAP_OFF_ARR_MAX = BPF_MAP_VALUE_OFF_MAX + 163 1 + /* for bpf_spin_lock */ 164 1, /* for bpf_timer */ 165 }; 166 167 enum bpf_kptr_type { 168 BPF_KPTR_UNREF, 169 BPF_KPTR_REF, 170 }; 171 172 struct bpf_map_value_off_desc { 173 u32 offset; 174 enum bpf_kptr_type type; 175 struct { 176 struct btf *btf; 177 struct module *module; 178 btf_dtor_kfunc_t dtor; 179 u32 btf_id; 180 } kptr; 181 }; 182 183 struct bpf_map_value_off { 184 u32 nr_off; 185 struct bpf_map_value_off_desc off[]; 186 }; 187 188 struct bpf_map_off_arr { 189 u32 cnt; 190 u32 field_off[BPF_MAP_OFF_ARR_MAX]; 191 u8 field_sz[BPF_MAP_OFF_ARR_MAX]; 192 }; 193 194 struct bpf_map { 195 /* The first two cachelines with read-mostly members of which some 196 * are also accessed in fast-path (e.g. ops, max_entries). 197 */ 198 const struct bpf_map_ops *ops ____cacheline_aligned; 199 struct bpf_map *inner_map_meta; 200 #ifdef CONFIG_SECURITY 201 void *security; 202 #endif 203 enum bpf_map_type map_type; 204 u32 key_size; 205 u32 value_size; 206 u32 max_entries; 207 u64 map_extra; /* any per-map-type extra fields */ 208 u32 map_flags; 209 int spin_lock_off; /* >=0 valid offset, <0 error */ 210 struct bpf_map_value_off *kptr_off_tab; 211 int timer_off; /* >=0 valid offset, <0 error */ 212 u32 id; 213 int numa_node; 214 u32 btf_key_type_id; 215 u32 btf_value_type_id; 216 u32 btf_vmlinux_value_type_id; 217 struct btf *btf; 218 #ifdef CONFIG_MEMCG_KMEM 219 struct mem_cgroup *memcg; 220 #endif 221 char name[BPF_OBJ_NAME_LEN]; 222 struct bpf_map_off_arr *off_arr; 223 /* The 3rd and 4th cacheline with misc members to avoid false sharing 224 * particularly with refcounting. 225 */ 226 atomic64_t refcnt ____cacheline_aligned; 227 atomic64_t usercnt; 228 struct work_struct work; 229 struct mutex freeze_mutex; 230 atomic64_t writecnt; 231 /* 'Ownership' of program-containing map is claimed by the first program 232 * that is going to use this map or by the first program which FD is 233 * stored in the map to make sure that all callers and callees have the 234 * same prog type, JITed flag and xdp_has_frags flag. 235 */ 236 struct { 237 spinlock_t lock; 238 enum bpf_prog_type type; 239 bool jited; 240 bool xdp_has_frags; 241 } owner; 242 bool bypass_spec_v1; 243 bool frozen; /* write-once; write-protected by freeze_mutex */ 244 }; 245 246 static inline bool map_value_has_spin_lock(const struct bpf_map *map) 247 { 248 return map->spin_lock_off >= 0; 249 } 250 251 static inline bool map_value_has_timer(const struct bpf_map *map) 252 { 253 return map->timer_off >= 0; 254 } 255 256 static inline bool map_value_has_kptrs(const struct bpf_map *map) 257 { 258 return !IS_ERR_OR_NULL(map->kptr_off_tab); 259 } 260 261 static inline void check_and_init_map_value(struct bpf_map *map, void *dst) 262 { 263 if (unlikely(map_value_has_spin_lock(map))) 264 memset(dst + map->spin_lock_off, 0, sizeof(struct bpf_spin_lock)); 265 if (unlikely(map_value_has_timer(map))) 266 memset(dst + map->timer_off, 0, sizeof(struct bpf_timer)); 267 if (unlikely(map_value_has_kptrs(map))) { 268 struct bpf_map_value_off *tab = map->kptr_off_tab; 269 int i; 270 271 for (i = 0; i < tab->nr_off; i++) 272 *(u64 *)(dst + tab->off[i].offset) = 0; 273 } 274 } 275 276 /* copy everything but bpf_spin_lock and bpf_timer. There could be one of each. */ 277 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src) 278 { 279 u32 curr_off = 0; 280 int i; 281 282 if (likely(!map->off_arr)) { 283 memcpy(dst, src, map->value_size); 284 return; 285 } 286 287 for (i = 0; i < map->off_arr->cnt; i++) { 288 u32 next_off = map->off_arr->field_off[i]; 289 290 memcpy(dst + curr_off, src + curr_off, next_off - curr_off); 291 curr_off += map->off_arr->field_sz[i]; 292 } 293 memcpy(dst + curr_off, src + curr_off, map->value_size - curr_off); 294 } 295 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src, 296 bool lock_src); 297 void bpf_timer_cancel_and_free(void *timer); 298 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size); 299 300 struct bpf_offload_dev; 301 struct bpf_offloaded_map; 302 303 struct bpf_map_dev_ops { 304 int (*map_get_next_key)(struct bpf_offloaded_map *map, 305 void *key, void *next_key); 306 int (*map_lookup_elem)(struct bpf_offloaded_map *map, 307 void *key, void *value); 308 int (*map_update_elem)(struct bpf_offloaded_map *map, 309 void *key, void *value, u64 flags); 310 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key); 311 }; 312 313 struct bpf_offloaded_map { 314 struct bpf_map map; 315 struct net_device *netdev; 316 const struct bpf_map_dev_ops *dev_ops; 317 void *dev_priv; 318 struct list_head offloads; 319 }; 320 321 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map) 322 { 323 return container_of(map, struct bpf_offloaded_map, map); 324 } 325 326 static inline bool bpf_map_offload_neutral(const struct bpf_map *map) 327 { 328 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY; 329 } 330 331 static inline bool bpf_map_support_seq_show(const struct bpf_map *map) 332 { 333 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) && 334 map->ops->map_seq_show_elem; 335 } 336 337 int map_check_no_btf(const struct bpf_map *map, 338 const struct btf *btf, 339 const struct btf_type *key_type, 340 const struct btf_type *value_type); 341 342 bool bpf_map_meta_equal(const struct bpf_map *meta0, 343 const struct bpf_map *meta1); 344 345 extern const struct bpf_map_ops bpf_map_offload_ops; 346 347 /* bpf_type_flag contains a set of flags that are applicable to the values of 348 * arg_type, ret_type and reg_type. For example, a pointer value may be null, 349 * or a memory is read-only. We classify types into two categories: base types 350 * and extended types. Extended types are base types combined with a type flag. 351 * 352 * Currently there are no more than 32 base types in arg_type, ret_type and 353 * reg_types. 354 */ 355 #define BPF_BASE_TYPE_BITS 8 356 357 enum bpf_type_flag { 358 /* PTR may be NULL. */ 359 PTR_MAYBE_NULL = BIT(0 + BPF_BASE_TYPE_BITS), 360 361 /* MEM is read-only. When applied on bpf_arg, it indicates the arg is 362 * compatible with both mutable and immutable memory. 363 */ 364 MEM_RDONLY = BIT(1 + BPF_BASE_TYPE_BITS), 365 366 /* MEM was "allocated" from a different helper, and cannot be mixed 367 * with regular non-MEM_ALLOC'ed MEM types. 368 */ 369 MEM_ALLOC = BIT(2 + BPF_BASE_TYPE_BITS), 370 371 /* MEM is in user address space. */ 372 MEM_USER = BIT(3 + BPF_BASE_TYPE_BITS), 373 374 /* MEM is a percpu memory. MEM_PERCPU tags PTR_TO_BTF_ID. When tagged 375 * with MEM_PERCPU, PTR_TO_BTF_ID _cannot_ be directly accessed. In 376 * order to drop this tag, it must be passed into bpf_per_cpu_ptr() 377 * or bpf_this_cpu_ptr(), which will return the pointer corresponding 378 * to the specified cpu. 379 */ 380 MEM_PERCPU = BIT(4 + BPF_BASE_TYPE_BITS), 381 382 /* Indicates that the argument will be released. */ 383 OBJ_RELEASE = BIT(5 + BPF_BASE_TYPE_BITS), 384 385 /* PTR is not trusted. This is only used with PTR_TO_BTF_ID, to mark 386 * unreferenced and referenced kptr loaded from map value using a load 387 * instruction, so that they can only be dereferenced but not escape the 388 * BPF program into the kernel (i.e. cannot be passed as arguments to 389 * kfunc or bpf helpers). 390 */ 391 PTR_UNTRUSTED = BIT(6 + BPF_BASE_TYPE_BITS), 392 393 MEM_UNINIT = BIT(7 + BPF_BASE_TYPE_BITS), 394 395 /* DYNPTR points to memory local to the bpf program. */ 396 DYNPTR_TYPE_LOCAL = BIT(8 + BPF_BASE_TYPE_BITS), 397 398 /* DYNPTR points to a ringbuf record. */ 399 DYNPTR_TYPE_RINGBUF = BIT(9 + BPF_BASE_TYPE_BITS), 400 401 __BPF_TYPE_FLAG_MAX, 402 __BPF_TYPE_LAST_FLAG = __BPF_TYPE_FLAG_MAX - 1, 403 }; 404 405 #define DYNPTR_TYPE_FLAG_MASK (DYNPTR_TYPE_LOCAL | DYNPTR_TYPE_RINGBUF) 406 407 /* Max number of base types. */ 408 #define BPF_BASE_TYPE_LIMIT (1UL << BPF_BASE_TYPE_BITS) 409 410 /* Max number of all types. */ 411 #define BPF_TYPE_LIMIT (__BPF_TYPE_LAST_FLAG | (__BPF_TYPE_LAST_FLAG - 1)) 412 413 /* function argument constraints */ 414 enum bpf_arg_type { 415 ARG_DONTCARE = 0, /* unused argument in helper function */ 416 417 /* the following constraints used to prototype 418 * bpf_map_lookup/update/delete_elem() functions 419 */ 420 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */ 421 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */ 422 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */ 423 424 /* Used to prototype bpf_memcmp() and other functions that access data 425 * on eBPF program stack 426 */ 427 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */ 428 429 ARG_CONST_SIZE, /* number of bytes accessed from memory */ 430 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */ 431 432 ARG_PTR_TO_CTX, /* pointer to context */ 433 ARG_ANYTHING, /* any (initialized) argument is ok */ 434 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */ 435 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */ 436 ARG_PTR_TO_INT, /* pointer to int */ 437 ARG_PTR_TO_LONG, /* pointer to long */ 438 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */ 439 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */ 440 ARG_PTR_TO_ALLOC_MEM, /* pointer to dynamically allocated memory */ 441 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */ 442 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */ 443 ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */ 444 ARG_PTR_TO_FUNC, /* pointer to a bpf program function */ 445 ARG_PTR_TO_STACK, /* pointer to stack */ 446 ARG_PTR_TO_CONST_STR, /* pointer to a null terminated read-only string */ 447 ARG_PTR_TO_TIMER, /* pointer to bpf_timer */ 448 ARG_PTR_TO_KPTR, /* pointer to referenced kptr */ 449 ARG_PTR_TO_DYNPTR, /* pointer to bpf_dynptr. See bpf_type_flag for dynptr type */ 450 __BPF_ARG_TYPE_MAX, 451 452 /* Extended arg_types. */ 453 ARG_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MAP_VALUE, 454 ARG_PTR_TO_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MEM, 455 ARG_PTR_TO_CTX_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_CTX, 456 ARG_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_SOCKET, 457 ARG_PTR_TO_ALLOC_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_ALLOC_MEM, 458 ARG_PTR_TO_STACK_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_STACK, 459 ARG_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_BTF_ID, 460 /* pointer to memory does not need to be initialized, helper function must fill 461 * all bytes or clear them in error case. 462 */ 463 ARG_PTR_TO_UNINIT_MEM = MEM_UNINIT | ARG_PTR_TO_MEM, 464 465 /* This must be the last entry. Its purpose is to ensure the enum is 466 * wide enough to hold the higher bits reserved for bpf_type_flag. 467 */ 468 __BPF_ARG_TYPE_LIMIT = BPF_TYPE_LIMIT, 469 }; 470 static_assert(__BPF_ARG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT); 471 472 /* type of values returned from helper functions */ 473 enum bpf_return_type { 474 RET_INTEGER, /* function returns integer */ 475 RET_VOID, /* function doesn't return anything */ 476 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */ 477 RET_PTR_TO_SOCKET, /* returns a pointer to a socket */ 478 RET_PTR_TO_TCP_SOCK, /* returns a pointer to a tcp_sock */ 479 RET_PTR_TO_SOCK_COMMON, /* returns a pointer to a sock_common */ 480 RET_PTR_TO_ALLOC_MEM, /* returns a pointer to dynamically allocated memory */ 481 RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */ 482 RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */ 483 __BPF_RET_TYPE_MAX, 484 485 /* Extended ret_types. */ 486 RET_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MAP_VALUE, 487 RET_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCKET, 488 RET_PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_TCP_SOCK, 489 RET_PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCK_COMMON, 490 RET_PTR_TO_ALLOC_MEM_OR_NULL = PTR_MAYBE_NULL | MEM_ALLOC | RET_PTR_TO_ALLOC_MEM, 491 RET_PTR_TO_DYNPTR_MEM_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_ALLOC_MEM, 492 RET_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_BTF_ID, 493 494 /* This must be the last entry. Its purpose is to ensure the enum is 495 * wide enough to hold the higher bits reserved for bpf_type_flag. 496 */ 497 __BPF_RET_TYPE_LIMIT = BPF_TYPE_LIMIT, 498 }; 499 static_assert(__BPF_RET_TYPE_MAX <= BPF_BASE_TYPE_LIMIT); 500 501 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs 502 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL 503 * instructions after verifying 504 */ 505 struct bpf_func_proto { 506 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 507 bool gpl_only; 508 bool pkt_access; 509 enum bpf_return_type ret_type; 510 union { 511 struct { 512 enum bpf_arg_type arg1_type; 513 enum bpf_arg_type arg2_type; 514 enum bpf_arg_type arg3_type; 515 enum bpf_arg_type arg4_type; 516 enum bpf_arg_type arg5_type; 517 }; 518 enum bpf_arg_type arg_type[5]; 519 }; 520 union { 521 struct { 522 u32 *arg1_btf_id; 523 u32 *arg2_btf_id; 524 u32 *arg3_btf_id; 525 u32 *arg4_btf_id; 526 u32 *arg5_btf_id; 527 }; 528 u32 *arg_btf_id[5]; 529 }; 530 int *ret_btf_id; /* return value btf_id */ 531 bool (*allowed)(const struct bpf_prog *prog); 532 }; 533 534 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is 535 * the first argument to eBPF programs. 536 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *' 537 */ 538 struct bpf_context; 539 540 enum bpf_access_type { 541 BPF_READ = 1, 542 BPF_WRITE = 2 543 }; 544 545 /* types of values stored in eBPF registers */ 546 /* Pointer types represent: 547 * pointer 548 * pointer + imm 549 * pointer + (u16) var 550 * pointer + (u16) var + imm 551 * if (range > 0) then [ptr, ptr + range - off) is safe to access 552 * if (id > 0) means that some 'var' was added 553 * if (off > 0) means that 'imm' was added 554 */ 555 enum bpf_reg_type { 556 NOT_INIT = 0, /* nothing was written into register */ 557 SCALAR_VALUE, /* reg doesn't contain a valid pointer */ 558 PTR_TO_CTX, /* reg points to bpf_context */ 559 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */ 560 PTR_TO_MAP_VALUE, /* reg points to map element value */ 561 PTR_TO_MAP_KEY, /* reg points to a map element key */ 562 PTR_TO_STACK, /* reg == frame_pointer + offset */ 563 PTR_TO_PACKET_META, /* skb->data - meta_len */ 564 PTR_TO_PACKET, /* reg points to skb->data */ 565 PTR_TO_PACKET_END, /* skb->data + headlen */ 566 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */ 567 PTR_TO_SOCKET, /* reg points to struct bpf_sock */ 568 PTR_TO_SOCK_COMMON, /* reg points to sock_common */ 569 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */ 570 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */ 571 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */ 572 /* PTR_TO_BTF_ID points to a kernel struct that does not need 573 * to be null checked by the BPF program. This does not imply the 574 * pointer is _not_ null and in practice this can easily be a null 575 * pointer when reading pointer chains. The assumption is program 576 * context will handle null pointer dereference typically via fault 577 * handling. The verifier must keep this in mind and can make no 578 * assumptions about null or non-null when doing branch analysis. 579 * Further, when passed into helpers the helpers can not, without 580 * additional context, assume the value is non-null. 581 */ 582 PTR_TO_BTF_ID, 583 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not 584 * been checked for null. Used primarily to inform the verifier 585 * an explicit null check is required for this struct. 586 */ 587 PTR_TO_MEM, /* reg points to valid memory region */ 588 PTR_TO_BUF, /* reg points to a read/write buffer */ 589 PTR_TO_FUNC, /* reg points to a bpf program function */ 590 __BPF_REG_TYPE_MAX, 591 592 /* Extended reg_types. */ 593 PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | PTR_TO_MAP_VALUE, 594 PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCKET, 595 PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON, 596 PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK, 597 PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | PTR_TO_BTF_ID, 598 599 /* This must be the last entry. Its purpose is to ensure the enum is 600 * wide enough to hold the higher bits reserved for bpf_type_flag. 601 */ 602 __BPF_REG_TYPE_LIMIT = BPF_TYPE_LIMIT, 603 }; 604 static_assert(__BPF_REG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT); 605 606 /* The information passed from prog-specific *_is_valid_access 607 * back to the verifier. 608 */ 609 struct bpf_insn_access_aux { 610 enum bpf_reg_type reg_type; 611 union { 612 int ctx_field_size; 613 struct { 614 struct btf *btf; 615 u32 btf_id; 616 }; 617 }; 618 struct bpf_verifier_log *log; /* for verbose logs */ 619 }; 620 621 static inline void 622 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size) 623 { 624 aux->ctx_field_size = size; 625 } 626 627 static inline bool bpf_pseudo_func(const struct bpf_insn *insn) 628 { 629 return insn->code == (BPF_LD | BPF_IMM | BPF_DW) && 630 insn->src_reg == BPF_PSEUDO_FUNC; 631 } 632 633 struct bpf_prog_ops { 634 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr, 635 union bpf_attr __user *uattr); 636 }; 637 638 struct bpf_verifier_ops { 639 /* return eBPF function prototype for verification */ 640 const struct bpf_func_proto * 641 (*get_func_proto)(enum bpf_func_id func_id, 642 const struct bpf_prog *prog); 643 644 /* return true if 'size' wide access at offset 'off' within bpf_context 645 * with 'type' (read or write) is allowed 646 */ 647 bool (*is_valid_access)(int off, int size, enum bpf_access_type type, 648 const struct bpf_prog *prog, 649 struct bpf_insn_access_aux *info); 650 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write, 651 const struct bpf_prog *prog); 652 int (*gen_ld_abs)(const struct bpf_insn *orig, 653 struct bpf_insn *insn_buf); 654 u32 (*convert_ctx_access)(enum bpf_access_type type, 655 const struct bpf_insn *src, 656 struct bpf_insn *dst, 657 struct bpf_prog *prog, u32 *target_size); 658 int (*btf_struct_access)(struct bpf_verifier_log *log, 659 const struct btf *btf, 660 const struct btf_type *t, int off, int size, 661 enum bpf_access_type atype, 662 u32 *next_btf_id, enum bpf_type_flag *flag); 663 }; 664 665 struct bpf_prog_offload_ops { 666 /* verifier basic callbacks */ 667 int (*insn_hook)(struct bpf_verifier_env *env, 668 int insn_idx, int prev_insn_idx); 669 int (*finalize)(struct bpf_verifier_env *env); 670 /* verifier optimization callbacks (called after .finalize) */ 671 int (*replace_insn)(struct bpf_verifier_env *env, u32 off, 672 struct bpf_insn *insn); 673 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt); 674 /* program management callbacks */ 675 int (*prepare)(struct bpf_prog *prog); 676 int (*translate)(struct bpf_prog *prog); 677 void (*destroy)(struct bpf_prog *prog); 678 }; 679 680 struct bpf_prog_offload { 681 struct bpf_prog *prog; 682 struct net_device *netdev; 683 struct bpf_offload_dev *offdev; 684 void *dev_priv; 685 struct list_head offloads; 686 bool dev_state; 687 bool opt_failed; 688 void *jited_image; 689 u32 jited_len; 690 }; 691 692 enum bpf_cgroup_storage_type { 693 BPF_CGROUP_STORAGE_SHARED, 694 BPF_CGROUP_STORAGE_PERCPU, 695 __BPF_CGROUP_STORAGE_MAX 696 }; 697 698 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX 699 700 /* The longest tracepoint has 12 args. 701 * See include/trace/bpf_probe.h 702 */ 703 #define MAX_BPF_FUNC_ARGS 12 704 705 /* The maximum number of arguments passed through registers 706 * a single function may have. 707 */ 708 #define MAX_BPF_FUNC_REG_ARGS 5 709 710 struct btf_func_model { 711 u8 ret_size; 712 u8 nr_args; 713 u8 arg_size[MAX_BPF_FUNC_ARGS]; 714 }; 715 716 /* Restore arguments before returning from trampoline to let original function 717 * continue executing. This flag is used for fentry progs when there are no 718 * fexit progs. 719 */ 720 #define BPF_TRAMP_F_RESTORE_REGS BIT(0) 721 /* Call original function after fentry progs, but before fexit progs. 722 * Makes sense for fentry/fexit, normal calls and indirect calls. 723 */ 724 #define BPF_TRAMP_F_CALL_ORIG BIT(1) 725 /* Skip current frame and return to parent. Makes sense for fentry/fexit 726 * programs only. Should not be used with normal calls and indirect calls. 727 */ 728 #define BPF_TRAMP_F_SKIP_FRAME BIT(2) 729 /* Store IP address of the caller on the trampoline stack, 730 * so it's available for trampoline's programs. 731 */ 732 #define BPF_TRAMP_F_IP_ARG BIT(3) 733 /* Return the return value of fentry prog. Only used by bpf_struct_ops. */ 734 #define BPF_TRAMP_F_RET_FENTRY_RET BIT(4) 735 736 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50 737 * bytes on x86. 738 */ 739 #define BPF_MAX_TRAMP_LINKS 38 740 741 struct bpf_tramp_links { 742 struct bpf_tramp_link *links[BPF_MAX_TRAMP_LINKS]; 743 int nr_links; 744 }; 745 746 struct bpf_tramp_run_ctx; 747 748 /* Different use cases for BPF trampoline: 749 * 1. replace nop at the function entry (kprobe equivalent) 750 * flags = BPF_TRAMP_F_RESTORE_REGS 751 * fentry = a set of programs to run before returning from trampoline 752 * 753 * 2. replace nop at the function entry (kprobe + kretprobe equivalent) 754 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME 755 * orig_call = fentry_ip + MCOUNT_INSN_SIZE 756 * fentry = a set of program to run before calling original function 757 * fexit = a set of program to run after original function 758 * 759 * 3. replace direct call instruction anywhere in the function body 760 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid) 761 * With flags = 0 762 * fentry = a set of programs to run before returning from trampoline 763 * With flags = BPF_TRAMP_F_CALL_ORIG 764 * orig_call = original callback addr or direct function addr 765 * fentry = a set of program to run before calling original function 766 * fexit = a set of program to run after original function 767 */ 768 struct bpf_tramp_image; 769 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *tr, void *image, void *image_end, 770 const struct btf_func_model *m, u32 flags, 771 struct bpf_tramp_links *tlinks, 772 void *orig_call); 773 /* these two functions are called from generated trampoline */ 774 u64 notrace __bpf_prog_enter(struct bpf_prog *prog, struct bpf_tramp_run_ctx *run_ctx); 775 void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start, struct bpf_tramp_run_ctx *run_ctx); 776 u64 notrace __bpf_prog_enter_sleepable(struct bpf_prog *prog, struct bpf_tramp_run_ctx *run_ctx); 777 void notrace __bpf_prog_exit_sleepable(struct bpf_prog *prog, u64 start, 778 struct bpf_tramp_run_ctx *run_ctx); 779 void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr); 780 void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr); 781 782 struct bpf_ksym { 783 unsigned long start; 784 unsigned long end; 785 char name[KSYM_NAME_LEN]; 786 struct list_head lnode; 787 struct latch_tree_node tnode; 788 bool prog; 789 }; 790 791 enum bpf_tramp_prog_type { 792 BPF_TRAMP_FENTRY, 793 BPF_TRAMP_FEXIT, 794 BPF_TRAMP_MODIFY_RETURN, 795 BPF_TRAMP_MAX, 796 BPF_TRAMP_REPLACE, /* more than MAX */ 797 }; 798 799 struct bpf_tramp_image { 800 void *image; 801 struct bpf_ksym ksym; 802 struct percpu_ref pcref; 803 void *ip_after_call; 804 void *ip_epilogue; 805 union { 806 struct rcu_head rcu; 807 struct work_struct work; 808 }; 809 }; 810 811 struct bpf_trampoline { 812 /* hlist for trampoline_table */ 813 struct hlist_node hlist; 814 /* serializes access to fields of this trampoline */ 815 struct mutex mutex; 816 refcount_t refcnt; 817 u64 key; 818 struct { 819 struct btf_func_model model; 820 void *addr; 821 bool ftrace_managed; 822 } func; 823 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF 824 * program by replacing one of its functions. func.addr is the address 825 * of the function it replaced. 826 */ 827 struct bpf_prog *extension_prog; 828 /* list of BPF programs using this trampoline */ 829 struct hlist_head progs_hlist[BPF_TRAMP_MAX]; 830 /* Number of attached programs. A counter per kind. */ 831 int progs_cnt[BPF_TRAMP_MAX]; 832 /* Executable image of trampoline */ 833 struct bpf_tramp_image *cur_image; 834 u64 selector; 835 struct module *mod; 836 }; 837 838 struct bpf_attach_target_info { 839 struct btf_func_model fmodel; 840 long tgt_addr; 841 const char *tgt_name; 842 const struct btf_type *tgt_type; 843 }; 844 845 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */ 846 847 struct bpf_dispatcher_prog { 848 struct bpf_prog *prog; 849 refcount_t users; 850 }; 851 852 struct bpf_dispatcher { 853 /* dispatcher mutex */ 854 struct mutex mutex; 855 void *func; 856 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX]; 857 int num_progs; 858 void *image; 859 u32 image_off; 860 struct bpf_ksym ksym; 861 }; 862 863 static __always_inline __nocfi unsigned int bpf_dispatcher_nop_func( 864 const void *ctx, 865 const struct bpf_insn *insnsi, 866 unsigned int (*bpf_func)(const void *, 867 const struct bpf_insn *)) 868 { 869 return bpf_func(ctx, insnsi); 870 } 871 872 #ifdef CONFIG_BPF_JIT 873 int bpf_trampoline_link_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr); 874 int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr); 875 struct bpf_trampoline *bpf_trampoline_get(u64 key, 876 struct bpf_attach_target_info *tgt_info); 877 void bpf_trampoline_put(struct bpf_trampoline *tr); 878 int arch_prepare_bpf_dispatcher(void *image, s64 *funcs, int num_funcs); 879 #define BPF_DISPATCHER_INIT(_name) { \ 880 .mutex = __MUTEX_INITIALIZER(_name.mutex), \ 881 .func = &_name##_func, \ 882 .progs = {}, \ 883 .num_progs = 0, \ 884 .image = NULL, \ 885 .image_off = 0, \ 886 .ksym = { \ 887 .name = #_name, \ 888 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \ 889 }, \ 890 } 891 892 #define DEFINE_BPF_DISPATCHER(name) \ 893 noinline __nocfi unsigned int bpf_dispatcher_##name##_func( \ 894 const void *ctx, \ 895 const struct bpf_insn *insnsi, \ 896 unsigned int (*bpf_func)(const void *, \ 897 const struct bpf_insn *)) \ 898 { \ 899 return bpf_func(ctx, insnsi); \ 900 } \ 901 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \ 902 struct bpf_dispatcher bpf_dispatcher_##name = \ 903 BPF_DISPATCHER_INIT(bpf_dispatcher_##name); 904 #define DECLARE_BPF_DISPATCHER(name) \ 905 unsigned int bpf_dispatcher_##name##_func( \ 906 const void *ctx, \ 907 const struct bpf_insn *insnsi, \ 908 unsigned int (*bpf_func)(const void *, \ 909 const struct bpf_insn *)); \ 910 extern struct bpf_dispatcher bpf_dispatcher_##name; 911 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func 912 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name) 913 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from, 914 struct bpf_prog *to); 915 /* Called only from JIT-enabled code, so there's no need for stubs. */ 916 void *bpf_jit_alloc_exec_page(void); 917 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym); 918 void bpf_image_ksym_del(struct bpf_ksym *ksym); 919 void bpf_ksym_add(struct bpf_ksym *ksym); 920 void bpf_ksym_del(struct bpf_ksym *ksym); 921 int bpf_jit_charge_modmem(u32 size); 922 void bpf_jit_uncharge_modmem(u32 size); 923 bool bpf_prog_has_trampoline(const struct bpf_prog *prog); 924 #else 925 static inline int bpf_trampoline_link_prog(struct bpf_tramp_link *link, 926 struct bpf_trampoline *tr) 927 { 928 return -ENOTSUPP; 929 } 930 static inline int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link, 931 struct bpf_trampoline *tr) 932 { 933 return -ENOTSUPP; 934 } 935 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key, 936 struct bpf_attach_target_info *tgt_info) 937 { 938 return ERR_PTR(-EOPNOTSUPP); 939 } 940 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {} 941 #define DEFINE_BPF_DISPATCHER(name) 942 #define DECLARE_BPF_DISPATCHER(name) 943 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func 944 #define BPF_DISPATCHER_PTR(name) NULL 945 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, 946 struct bpf_prog *from, 947 struct bpf_prog *to) {} 948 static inline bool is_bpf_image_address(unsigned long address) 949 { 950 return false; 951 } 952 static inline bool bpf_prog_has_trampoline(const struct bpf_prog *prog) 953 { 954 return false; 955 } 956 #endif 957 958 struct bpf_func_info_aux { 959 u16 linkage; 960 bool unreliable; 961 }; 962 963 enum bpf_jit_poke_reason { 964 BPF_POKE_REASON_TAIL_CALL, 965 }; 966 967 /* Descriptor of pokes pointing /into/ the JITed image. */ 968 struct bpf_jit_poke_descriptor { 969 void *tailcall_target; 970 void *tailcall_bypass; 971 void *bypass_addr; 972 void *aux; 973 union { 974 struct { 975 struct bpf_map *map; 976 u32 key; 977 } tail_call; 978 }; 979 bool tailcall_target_stable; 980 u8 adj_off; 981 u16 reason; 982 u32 insn_idx; 983 }; 984 985 /* reg_type info for ctx arguments */ 986 struct bpf_ctx_arg_aux { 987 u32 offset; 988 enum bpf_reg_type reg_type; 989 u32 btf_id; 990 }; 991 992 struct btf_mod_pair { 993 struct btf *btf; 994 struct module *module; 995 }; 996 997 struct bpf_kfunc_desc_tab; 998 999 struct bpf_prog_aux { 1000 atomic64_t refcnt; 1001 u32 used_map_cnt; 1002 u32 used_btf_cnt; 1003 u32 max_ctx_offset; 1004 u32 max_pkt_offset; 1005 u32 max_tp_access; 1006 u32 stack_depth; 1007 u32 id; 1008 u32 func_cnt; /* used by non-func prog as the number of func progs */ 1009 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */ 1010 u32 attach_btf_id; /* in-kernel BTF type id to attach to */ 1011 u32 ctx_arg_info_size; 1012 u32 max_rdonly_access; 1013 u32 max_rdwr_access; 1014 struct btf *attach_btf; 1015 const struct bpf_ctx_arg_aux *ctx_arg_info; 1016 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */ 1017 struct bpf_prog *dst_prog; 1018 struct bpf_trampoline *dst_trampoline; 1019 enum bpf_prog_type saved_dst_prog_type; 1020 enum bpf_attach_type saved_dst_attach_type; 1021 bool verifier_zext; /* Zero extensions has been inserted by verifier. */ 1022 bool offload_requested; 1023 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */ 1024 bool func_proto_unreliable; 1025 bool sleepable; 1026 bool tail_call_reachable; 1027 bool xdp_has_frags; 1028 bool use_bpf_prog_pack; 1029 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */ 1030 const struct btf_type *attach_func_proto; 1031 /* function name for valid attach_btf_id */ 1032 const char *attach_func_name; 1033 struct bpf_prog **func; 1034 void *jit_data; /* JIT specific data. arch dependent */ 1035 struct bpf_jit_poke_descriptor *poke_tab; 1036 struct bpf_kfunc_desc_tab *kfunc_tab; 1037 struct bpf_kfunc_btf_tab *kfunc_btf_tab; 1038 u32 size_poke_tab; 1039 struct bpf_ksym ksym; 1040 const struct bpf_prog_ops *ops; 1041 struct bpf_map **used_maps; 1042 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */ 1043 struct btf_mod_pair *used_btfs; 1044 struct bpf_prog *prog; 1045 struct user_struct *user; 1046 u64 load_time; /* ns since boottime */ 1047 u32 verified_insns; 1048 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]; 1049 char name[BPF_OBJ_NAME_LEN]; 1050 #ifdef CONFIG_SECURITY 1051 void *security; 1052 #endif 1053 struct bpf_prog_offload *offload; 1054 struct btf *btf; 1055 struct bpf_func_info *func_info; 1056 struct bpf_func_info_aux *func_info_aux; 1057 /* bpf_line_info loaded from userspace. linfo->insn_off 1058 * has the xlated insn offset. 1059 * Both the main and sub prog share the same linfo. 1060 * The subprog can access its first linfo by 1061 * using the linfo_idx. 1062 */ 1063 struct bpf_line_info *linfo; 1064 /* jited_linfo is the jited addr of the linfo. It has a 1065 * one to one mapping to linfo: 1066 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off. 1067 * Both the main and sub prog share the same jited_linfo. 1068 * The subprog can access its first jited_linfo by 1069 * using the linfo_idx. 1070 */ 1071 void **jited_linfo; 1072 u32 func_info_cnt; 1073 u32 nr_linfo; 1074 /* subprog can use linfo_idx to access its first linfo and 1075 * jited_linfo. 1076 * main prog always has linfo_idx == 0 1077 */ 1078 u32 linfo_idx; 1079 u32 num_exentries; 1080 struct exception_table_entry *extable; 1081 union { 1082 struct work_struct work; 1083 struct rcu_head rcu; 1084 }; 1085 }; 1086 1087 struct bpf_array_aux { 1088 /* Programs with direct jumps into programs part of this array. */ 1089 struct list_head poke_progs; 1090 struct bpf_map *map; 1091 struct mutex poke_mutex; 1092 struct work_struct work; 1093 }; 1094 1095 struct bpf_link { 1096 atomic64_t refcnt; 1097 u32 id; 1098 enum bpf_link_type type; 1099 const struct bpf_link_ops *ops; 1100 struct bpf_prog *prog; 1101 struct work_struct work; 1102 }; 1103 1104 struct bpf_link_ops { 1105 void (*release)(struct bpf_link *link); 1106 void (*dealloc)(struct bpf_link *link); 1107 int (*detach)(struct bpf_link *link); 1108 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog, 1109 struct bpf_prog *old_prog); 1110 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq); 1111 int (*fill_link_info)(const struct bpf_link *link, 1112 struct bpf_link_info *info); 1113 }; 1114 1115 struct bpf_tramp_link { 1116 struct bpf_link link; 1117 struct hlist_node tramp_hlist; 1118 u64 cookie; 1119 }; 1120 1121 struct bpf_tracing_link { 1122 struct bpf_tramp_link link; 1123 enum bpf_attach_type attach_type; 1124 struct bpf_trampoline *trampoline; 1125 struct bpf_prog *tgt_prog; 1126 }; 1127 1128 struct bpf_link_primer { 1129 struct bpf_link *link; 1130 struct file *file; 1131 int fd; 1132 u32 id; 1133 }; 1134 1135 struct bpf_struct_ops_value; 1136 struct btf_member; 1137 1138 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64 1139 struct bpf_struct_ops { 1140 const struct bpf_verifier_ops *verifier_ops; 1141 int (*init)(struct btf *btf); 1142 int (*check_member)(const struct btf_type *t, 1143 const struct btf_member *member); 1144 int (*init_member)(const struct btf_type *t, 1145 const struct btf_member *member, 1146 void *kdata, const void *udata); 1147 int (*reg)(void *kdata); 1148 void (*unreg)(void *kdata); 1149 const struct btf_type *type; 1150 const struct btf_type *value_type; 1151 const char *name; 1152 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS]; 1153 u32 type_id; 1154 u32 value_id; 1155 }; 1156 1157 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL) 1158 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA)) 1159 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id); 1160 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log); 1161 bool bpf_struct_ops_get(const void *kdata); 1162 void bpf_struct_ops_put(const void *kdata); 1163 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key, 1164 void *value); 1165 int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_links *tlinks, 1166 struct bpf_tramp_link *link, 1167 const struct btf_func_model *model, 1168 void *image, void *image_end); 1169 static inline bool bpf_try_module_get(const void *data, struct module *owner) 1170 { 1171 if (owner == BPF_MODULE_OWNER) 1172 return bpf_struct_ops_get(data); 1173 else 1174 return try_module_get(owner); 1175 } 1176 static inline void bpf_module_put(const void *data, struct module *owner) 1177 { 1178 if (owner == BPF_MODULE_OWNER) 1179 bpf_struct_ops_put(data); 1180 else 1181 module_put(owner); 1182 } 1183 1184 #ifdef CONFIG_NET 1185 /* Define it here to avoid the use of forward declaration */ 1186 struct bpf_dummy_ops_state { 1187 int val; 1188 }; 1189 1190 struct bpf_dummy_ops { 1191 int (*test_1)(struct bpf_dummy_ops_state *cb); 1192 int (*test_2)(struct bpf_dummy_ops_state *cb, int a1, unsigned short a2, 1193 char a3, unsigned long a4); 1194 }; 1195 1196 int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr, 1197 union bpf_attr __user *uattr); 1198 #endif 1199 #else 1200 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id) 1201 { 1202 return NULL; 1203 } 1204 static inline void bpf_struct_ops_init(struct btf *btf, 1205 struct bpf_verifier_log *log) 1206 { 1207 } 1208 static inline bool bpf_try_module_get(const void *data, struct module *owner) 1209 { 1210 return try_module_get(owner); 1211 } 1212 static inline void bpf_module_put(const void *data, struct module *owner) 1213 { 1214 module_put(owner); 1215 } 1216 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, 1217 void *key, 1218 void *value) 1219 { 1220 return -EINVAL; 1221 } 1222 #endif 1223 1224 struct bpf_array { 1225 struct bpf_map map; 1226 u32 elem_size; 1227 u32 index_mask; 1228 struct bpf_array_aux *aux; 1229 union { 1230 char value[0] __aligned(8); 1231 void *ptrs[0] __aligned(8); 1232 void __percpu *pptrs[0] __aligned(8); 1233 }; 1234 }; 1235 1236 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */ 1237 #define MAX_TAIL_CALL_CNT 33 1238 1239 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \ 1240 BPF_F_RDONLY_PROG | \ 1241 BPF_F_WRONLY | \ 1242 BPF_F_WRONLY_PROG) 1243 1244 #define BPF_MAP_CAN_READ BIT(0) 1245 #define BPF_MAP_CAN_WRITE BIT(1) 1246 1247 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map) 1248 { 1249 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG); 1250 1251 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is 1252 * not possible. 1253 */ 1254 if (access_flags & BPF_F_RDONLY_PROG) 1255 return BPF_MAP_CAN_READ; 1256 else if (access_flags & BPF_F_WRONLY_PROG) 1257 return BPF_MAP_CAN_WRITE; 1258 else 1259 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE; 1260 } 1261 1262 static inline bool bpf_map_flags_access_ok(u32 access_flags) 1263 { 1264 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) != 1265 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG); 1266 } 1267 1268 struct bpf_event_entry { 1269 struct perf_event *event; 1270 struct file *perf_file; 1271 struct file *map_file; 1272 struct rcu_head rcu; 1273 }; 1274 1275 static inline bool map_type_contains_progs(struct bpf_map *map) 1276 { 1277 return map->map_type == BPF_MAP_TYPE_PROG_ARRAY || 1278 map->map_type == BPF_MAP_TYPE_DEVMAP || 1279 map->map_type == BPF_MAP_TYPE_CPUMAP; 1280 } 1281 1282 bool bpf_prog_map_compatible(struct bpf_map *map, const struct bpf_prog *fp); 1283 int bpf_prog_calc_tag(struct bpf_prog *fp); 1284 1285 const struct bpf_func_proto *bpf_get_trace_printk_proto(void); 1286 const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void); 1287 1288 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src, 1289 unsigned long off, unsigned long len); 1290 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type, 1291 const struct bpf_insn *src, 1292 struct bpf_insn *dst, 1293 struct bpf_prog *prog, 1294 u32 *target_size); 1295 1296 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, 1297 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy); 1298 1299 /* an array of programs to be executed under rcu_lock. 1300 * 1301 * Typical usage: 1302 * ret = bpf_prog_run_array(rcu_dereference(&bpf_prog_array), ctx, bpf_prog_run); 1303 * 1304 * the structure returned by bpf_prog_array_alloc() should be populated 1305 * with program pointers and the last pointer must be NULL. 1306 * The user has to keep refcnt on the program and make sure the program 1307 * is removed from the array before bpf_prog_put(). 1308 * The 'struct bpf_prog_array *' should only be replaced with xchg() 1309 * since other cpus are walking the array of pointers in parallel. 1310 */ 1311 struct bpf_prog_array_item { 1312 struct bpf_prog *prog; 1313 union { 1314 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]; 1315 u64 bpf_cookie; 1316 }; 1317 }; 1318 1319 struct bpf_prog_array { 1320 struct rcu_head rcu; 1321 struct bpf_prog_array_item items[]; 1322 }; 1323 1324 struct bpf_empty_prog_array { 1325 struct bpf_prog_array hdr; 1326 struct bpf_prog *null_prog; 1327 }; 1328 1329 /* to avoid allocating empty bpf_prog_array for cgroups that 1330 * don't have bpf program attached use one global 'bpf_empty_prog_array' 1331 * It will not be modified the caller of bpf_prog_array_alloc() 1332 * (since caller requested prog_cnt == 0) 1333 * that pointer should be 'freed' by bpf_prog_array_free() 1334 */ 1335 extern struct bpf_empty_prog_array bpf_empty_prog_array; 1336 1337 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags); 1338 void bpf_prog_array_free(struct bpf_prog_array *progs); 1339 int bpf_prog_array_length(struct bpf_prog_array *progs); 1340 bool bpf_prog_array_is_empty(struct bpf_prog_array *array); 1341 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs, 1342 __u32 __user *prog_ids, u32 cnt); 1343 1344 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs, 1345 struct bpf_prog *old_prog); 1346 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index); 1347 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index, 1348 struct bpf_prog *prog); 1349 int bpf_prog_array_copy_info(struct bpf_prog_array *array, 1350 u32 *prog_ids, u32 request_cnt, 1351 u32 *prog_cnt); 1352 int bpf_prog_array_copy(struct bpf_prog_array *old_array, 1353 struct bpf_prog *exclude_prog, 1354 struct bpf_prog *include_prog, 1355 u64 bpf_cookie, 1356 struct bpf_prog_array **new_array); 1357 1358 struct bpf_run_ctx {}; 1359 1360 struct bpf_cg_run_ctx { 1361 struct bpf_run_ctx run_ctx; 1362 const struct bpf_prog_array_item *prog_item; 1363 int retval; 1364 }; 1365 1366 struct bpf_trace_run_ctx { 1367 struct bpf_run_ctx run_ctx; 1368 u64 bpf_cookie; 1369 }; 1370 1371 struct bpf_tramp_run_ctx { 1372 struct bpf_run_ctx run_ctx; 1373 u64 bpf_cookie; 1374 struct bpf_run_ctx *saved_run_ctx; 1375 }; 1376 1377 static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx) 1378 { 1379 struct bpf_run_ctx *old_ctx = NULL; 1380 1381 #ifdef CONFIG_BPF_SYSCALL 1382 old_ctx = current->bpf_ctx; 1383 current->bpf_ctx = new_ctx; 1384 #endif 1385 return old_ctx; 1386 } 1387 1388 static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx) 1389 { 1390 #ifdef CONFIG_BPF_SYSCALL 1391 current->bpf_ctx = old_ctx; 1392 #endif 1393 } 1394 1395 /* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */ 1396 #define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE (1 << 0) 1397 /* BPF program asks to set CN on the packet. */ 1398 #define BPF_RET_SET_CN (1 << 0) 1399 1400 typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx); 1401 1402 static __always_inline u32 1403 bpf_prog_run_array(const struct bpf_prog_array *array, 1404 const void *ctx, bpf_prog_run_fn run_prog) 1405 { 1406 const struct bpf_prog_array_item *item; 1407 const struct bpf_prog *prog; 1408 struct bpf_run_ctx *old_run_ctx; 1409 struct bpf_trace_run_ctx run_ctx; 1410 u32 ret = 1; 1411 1412 RCU_LOCKDEP_WARN(!rcu_read_lock_held(), "no rcu lock held"); 1413 1414 if (unlikely(!array)) 1415 return ret; 1416 1417 migrate_disable(); 1418 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx); 1419 item = &array->items[0]; 1420 while ((prog = READ_ONCE(item->prog))) { 1421 run_ctx.bpf_cookie = item->bpf_cookie; 1422 ret &= run_prog(prog, ctx); 1423 item++; 1424 } 1425 bpf_reset_run_ctx(old_run_ctx); 1426 migrate_enable(); 1427 return ret; 1428 } 1429 1430 #ifdef CONFIG_BPF_SYSCALL 1431 DECLARE_PER_CPU(int, bpf_prog_active); 1432 extern struct mutex bpf_stats_enabled_mutex; 1433 1434 /* 1435 * Block execution of BPF programs attached to instrumentation (perf, 1436 * kprobes, tracepoints) to prevent deadlocks on map operations as any of 1437 * these events can happen inside a region which holds a map bucket lock 1438 * and can deadlock on it. 1439 */ 1440 static inline void bpf_disable_instrumentation(void) 1441 { 1442 migrate_disable(); 1443 this_cpu_inc(bpf_prog_active); 1444 } 1445 1446 static inline void bpf_enable_instrumentation(void) 1447 { 1448 this_cpu_dec(bpf_prog_active); 1449 migrate_enable(); 1450 } 1451 1452 extern const struct file_operations bpf_map_fops; 1453 extern const struct file_operations bpf_prog_fops; 1454 extern const struct file_operations bpf_iter_fops; 1455 1456 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \ 1457 extern const struct bpf_prog_ops _name ## _prog_ops; \ 1458 extern const struct bpf_verifier_ops _name ## _verifier_ops; 1459 #define BPF_MAP_TYPE(_id, _ops) \ 1460 extern const struct bpf_map_ops _ops; 1461 #define BPF_LINK_TYPE(_id, _name) 1462 #include <linux/bpf_types.h> 1463 #undef BPF_PROG_TYPE 1464 #undef BPF_MAP_TYPE 1465 #undef BPF_LINK_TYPE 1466 1467 extern const struct bpf_prog_ops bpf_offload_prog_ops; 1468 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops; 1469 extern const struct bpf_verifier_ops xdp_analyzer_ops; 1470 1471 struct bpf_prog *bpf_prog_get(u32 ufd); 1472 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, 1473 bool attach_drv); 1474 void bpf_prog_add(struct bpf_prog *prog, int i); 1475 void bpf_prog_sub(struct bpf_prog *prog, int i); 1476 void bpf_prog_inc(struct bpf_prog *prog); 1477 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog); 1478 void bpf_prog_put(struct bpf_prog *prog); 1479 1480 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock); 1481 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock); 1482 1483 struct bpf_map_value_off_desc *bpf_map_kptr_off_contains(struct bpf_map *map, u32 offset); 1484 void bpf_map_free_kptr_off_tab(struct bpf_map *map); 1485 struct bpf_map_value_off *bpf_map_copy_kptr_off_tab(const struct bpf_map *map); 1486 bool bpf_map_equal_kptr_off_tab(const struct bpf_map *map_a, const struct bpf_map *map_b); 1487 void bpf_map_free_kptrs(struct bpf_map *map, void *map_value); 1488 1489 struct bpf_map *bpf_map_get(u32 ufd); 1490 struct bpf_map *bpf_map_get_with_uref(u32 ufd); 1491 struct bpf_map *__bpf_map_get(struct fd f); 1492 void bpf_map_inc(struct bpf_map *map); 1493 void bpf_map_inc_with_uref(struct bpf_map *map); 1494 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map); 1495 void bpf_map_put_with_uref(struct bpf_map *map); 1496 void bpf_map_put(struct bpf_map *map); 1497 void *bpf_map_area_alloc(u64 size, int numa_node); 1498 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node); 1499 void bpf_map_area_free(void *base); 1500 bool bpf_map_write_active(const struct bpf_map *map); 1501 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr); 1502 int generic_map_lookup_batch(struct bpf_map *map, 1503 const union bpf_attr *attr, 1504 union bpf_attr __user *uattr); 1505 int generic_map_update_batch(struct bpf_map *map, 1506 const union bpf_attr *attr, 1507 union bpf_attr __user *uattr); 1508 int generic_map_delete_batch(struct bpf_map *map, 1509 const union bpf_attr *attr, 1510 union bpf_attr __user *uattr); 1511 struct bpf_map *bpf_map_get_curr_or_next(u32 *id); 1512 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id); 1513 1514 #ifdef CONFIG_MEMCG_KMEM 1515 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags, 1516 int node); 1517 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags); 1518 void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, 1519 size_t align, gfp_t flags); 1520 #else 1521 static inline void * 1522 bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags, 1523 int node) 1524 { 1525 return kmalloc_node(size, flags, node); 1526 } 1527 1528 static inline void * 1529 bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags) 1530 { 1531 return kzalloc(size, flags); 1532 } 1533 1534 static inline void __percpu * 1535 bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, size_t align, 1536 gfp_t flags) 1537 { 1538 return __alloc_percpu_gfp(size, align, flags); 1539 } 1540 #endif 1541 1542 extern int sysctl_unprivileged_bpf_disabled; 1543 1544 static inline bool bpf_allow_ptr_leaks(void) 1545 { 1546 return perfmon_capable(); 1547 } 1548 1549 static inline bool bpf_allow_uninit_stack(void) 1550 { 1551 return perfmon_capable(); 1552 } 1553 1554 static inline bool bpf_allow_ptr_to_map_access(void) 1555 { 1556 return perfmon_capable(); 1557 } 1558 1559 static inline bool bpf_bypass_spec_v1(void) 1560 { 1561 return perfmon_capable(); 1562 } 1563 1564 static inline bool bpf_bypass_spec_v4(void) 1565 { 1566 return perfmon_capable(); 1567 } 1568 1569 int bpf_map_new_fd(struct bpf_map *map, int flags); 1570 int bpf_prog_new_fd(struct bpf_prog *prog); 1571 1572 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type, 1573 const struct bpf_link_ops *ops, struct bpf_prog *prog); 1574 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer); 1575 int bpf_link_settle(struct bpf_link_primer *primer); 1576 void bpf_link_cleanup(struct bpf_link_primer *primer); 1577 void bpf_link_inc(struct bpf_link *link); 1578 void bpf_link_put(struct bpf_link *link); 1579 int bpf_link_new_fd(struct bpf_link *link); 1580 struct file *bpf_link_new_file(struct bpf_link *link, int *reserved_fd); 1581 struct bpf_link *bpf_link_get_from_fd(u32 ufd); 1582 struct bpf_link *bpf_link_get_curr_or_next(u32 *id); 1583 1584 int bpf_obj_pin_user(u32 ufd, const char __user *pathname); 1585 int bpf_obj_get_user(const char __user *pathname, int flags); 1586 1587 #define BPF_ITER_FUNC_PREFIX "bpf_iter_" 1588 #define DEFINE_BPF_ITER_FUNC(target, args...) \ 1589 extern int bpf_iter_ ## target(args); \ 1590 int __init bpf_iter_ ## target(args) { return 0; } 1591 1592 struct bpf_iter_aux_info { 1593 struct bpf_map *map; 1594 }; 1595 1596 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog, 1597 union bpf_iter_link_info *linfo, 1598 struct bpf_iter_aux_info *aux); 1599 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux); 1600 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux, 1601 struct seq_file *seq); 1602 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux, 1603 struct bpf_link_info *info); 1604 typedef const struct bpf_func_proto * 1605 (*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id, 1606 const struct bpf_prog *prog); 1607 1608 enum bpf_iter_feature { 1609 BPF_ITER_RESCHED = BIT(0), 1610 }; 1611 1612 #define BPF_ITER_CTX_ARG_MAX 2 1613 struct bpf_iter_reg { 1614 const char *target; 1615 bpf_iter_attach_target_t attach_target; 1616 bpf_iter_detach_target_t detach_target; 1617 bpf_iter_show_fdinfo_t show_fdinfo; 1618 bpf_iter_fill_link_info_t fill_link_info; 1619 bpf_iter_get_func_proto_t get_func_proto; 1620 u32 ctx_arg_info_size; 1621 u32 feature; 1622 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX]; 1623 const struct bpf_iter_seq_info *seq_info; 1624 }; 1625 1626 struct bpf_iter_meta { 1627 __bpf_md_ptr(struct seq_file *, seq); 1628 u64 session_id; 1629 u64 seq_num; 1630 }; 1631 1632 struct bpf_iter__bpf_map_elem { 1633 __bpf_md_ptr(struct bpf_iter_meta *, meta); 1634 __bpf_md_ptr(struct bpf_map *, map); 1635 __bpf_md_ptr(void *, key); 1636 __bpf_md_ptr(void *, value); 1637 }; 1638 1639 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info); 1640 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info); 1641 bool bpf_iter_prog_supported(struct bpf_prog *prog); 1642 const struct bpf_func_proto * 1643 bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog); 1644 int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog); 1645 int bpf_iter_new_fd(struct bpf_link *link); 1646 bool bpf_link_is_iter(struct bpf_link *link); 1647 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop); 1648 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx); 1649 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux, 1650 struct seq_file *seq); 1651 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux, 1652 struct bpf_link_info *info); 1653 1654 int map_set_for_each_callback_args(struct bpf_verifier_env *env, 1655 struct bpf_func_state *caller, 1656 struct bpf_func_state *callee); 1657 1658 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value); 1659 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value); 1660 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value, 1661 u64 flags); 1662 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value, 1663 u64 flags); 1664 1665 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value); 1666 1667 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file, 1668 void *key, void *value, u64 map_flags); 1669 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 1670 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file, 1671 void *key, void *value, u64 map_flags); 1672 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 1673 1674 int bpf_get_file_flag(int flags); 1675 int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size, 1676 size_t actual_size); 1677 1678 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and 1679 * forced to use 'long' read/writes to try to atomically copy long counters. 1680 * Best-effort only. No barriers here, since it _will_ race with concurrent 1681 * updates from BPF programs. Called from bpf syscall and mostly used with 1682 * size 8 or 16 bytes, so ask compiler to inline it. 1683 */ 1684 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size) 1685 { 1686 const long *lsrc = src; 1687 long *ldst = dst; 1688 1689 size /= sizeof(long); 1690 while (size--) 1691 *ldst++ = *lsrc++; 1692 } 1693 1694 /* verify correctness of eBPF program */ 1695 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr); 1696 1697 #ifndef CONFIG_BPF_JIT_ALWAYS_ON 1698 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth); 1699 #endif 1700 1701 struct btf *bpf_get_btf_vmlinux(void); 1702 1703 /* Map specifics */ 1704 struct xdp_frame; 1705 struct sk_buff; 1706 struct bpf_dtab_netdev; 1707 struct bpf_cpu_map_entry; 1708 1709 void __dev_flush(void); 1710 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf, 1711 struct net_device *dev_rx); 1712 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf, 1713 struct net_device *dev_rx); 1714 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx, 1715 struct bpf_map *map, bool exclude_ingress); 1716 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb, 1717 struct bpf_prog *xdp_prog); 1718 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb, 1719 struct bpf_prog *xdp_prog, struct bpf_map *map, 1720 bool exclude_ingress); 1721 1722 void __cpu_map_flush(void); 1723 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf, 1724 struct net_device *dev_rx); 1725 int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu, 1726 struct sk_buff *skb); 1727 1728 /* Return map's numa specified by userspace */ 1729 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr) 1730 { 1731 return (attr->map_flags & BPF_F_NUMA_NODE) ? 1732 attr->numa_node : NUMA_NO_NODE; 1733 } 1734 1735 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type); 1736 int array_map_alloc_check(union bpf_attr *attr); 1737 1738 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, 1739 union bpf_attr __user *uattr); 1740 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, 1741 union bpf_attr __user *uattr); 1742 int bpf_prog_test_run_tracing(struct bpf_prog *prog, 1743 const union bpf_attr *kattr, 1744 union bpf_attr __user *uattr); 1745 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, 1746 const union bpf_attr *kattr, 1747 union bpf_attr __user *uattr); 1748 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog, 1749 const union bpf_attr *kattr, 1750 union bpf_attr __user *uattr); 1751 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog, 1752 const union bpf_attr *kattr, 1753 union bpf_attr __user *uattr); 1754 bool btf_ctx_access(int off, int size, enum bpf_access_type type, 1755 const struct bpf_prog *prog, 1756 struct bpf_insn_access_aux *info); 1757 1758 static inline bool bpf_tracing_ctx_access(int off, int size, 1759 enum bpf_access_type type) 1760 { 1761 if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS) 1762 return false; 1763 if (type != BPF_READ) 1764 return false; 1765 if (off % size != 0) 1766 return false; 1767 return true; 1768 } 1769 1770 static inline bool bpf_tracing_btf_ctx_access(int off, int size, 1771 enum bpf_access_type type, 1772 const struct bpf_prog *prog, 1773 struct bpf_insn_access_aux *info) 1774 { 1775 if (!bpf_tracing_ctx_access(off, size, type)) 1776 return false; 1777 return btf_ctx_access(off, size, type, prog, info); 1778 } 1779 1780 int btf_struct_access(struct bpf_verifier_log *log, const struct btf *btf, 1781 const struct btf_type *t, int off, int size, 1782 enum bpf_access_type atype, 1783 u32 *next_btf_id, enum bpf_type_flag *flag); 1784 bool btf_struct_ids_match(struct bpf_verifier_log *log, 1785 const struct btf *btf, u32 id, int off, 1786 const struct btf *need_btf, u32 need_type_id, 1787 bool strict); 1788 1789 int btf_distill_func_proto(struct bpf_verifier_log *log, 1790 struct btf *btf, 1791 const struct btf_type *func_proto, 1792 const char *func_name, 1793 struct btf_func_model *m); 1794 1795 struct bpf_reg_state; 1796 int btf_check_subprog_arg_match(struct bpf_verifier_env *env, int subprog, 1797 struct bpf_reg_state *regs); 1798 int btf_check_kfunc_arg_match(struct bpf_verifier_env *env, 1799 const struct btf *btf, u32 func_id, 1800 struct bpf_reg_state *regs); 1801 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog, 1802 struct bpf_reg_state *reg); 1803 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog, 1804 struct btf *btf, const struct btf_type *t); 1805 1806 struct bpf_prog *bpf_prog_by_id(u32 id); 1807 struct bpf_link *bpf_link_by_id(u32 id); 1808 1809 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id); 1810 void bpf_task_storage_free(struct task_struct *task); 1811 bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog); 1812 const struct btf_func_model * 1813 bpf_jit_find_kfunc_model(const struct bpf_prog *prog, 1814 const struct bpf_insn *insn); 1815 struct bpf_core_ctx { 1816 struct bpf_verifier_log *log; 1817 const struct btf *btf; 1818 }; 1819 1820 int bpf_core_apply(struct bpf_core_ctx *ctx, const struct bpf_core_relo *relo, 1821 int relo_idx, void *insn); 1822 1823 static inline bool unprivileged_ebpf_enabled(void) 1824 { 1825 return !sysctl_unprivileged_bpf_disabled; 1826 } 1827 1828 #else /* !CONFIG_BPF_SYSCALL */ 1829 static inline struct bpf_prog *bpf_prog_get(u32 ufd) 1830 { 1831 return ERR_PTR(-EOPNOTSUPP); 1832 } 1833 1834 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, 1835 enum bpf_prog_type type, 1836 bool attach_drv) 1837 { 1838 return ERR_PTR(-EOPNOTSUPP); 1839 } 1840 1841 static inline void bpf_prog_add(struct bpf_prog *prog, int i) 1842 { 1843 } 1844 1845 static inline void bpf_prog_sub(struct bpf_prog *prog, int i) 1846 { 1847 } 1848 1849 static inline void bpf_prog_put(struct bpf_prog *prog) 1850 { 1851 } 1852 1853 static inline void bpf_prog_inc(struct bpf_prog *prog) 1854 { 1855 } 1856 1857 static inline struct bpf_prog *__must_check 1858 bpf_prog_inc_not_zero(struct bpf_prog *prog) 1859 { 1860 return ERR_PTR(-EOPNOTSUPP); 1861 } 1862 1863 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type, 1864 const struct bpf_link_ops *ops, 1865 struct bpf_prog *prog) 1866 { 1867 } 1868 1869 static inline int bpf_link_prime(struct bpf_link *link, 1870 struct bpf_link_primer *primer) 1871 { 1872 return -EOPNOTSUPP; 1873 } 1874 1875 static inline int bpf_link_settle(struct bpf_link_primer *primer) 1876 { 1877 return -EOPNOTSUPP; 1878 } 1879 1880 static inline void bpf_link_cleanup(struct bpf_link_primer *primer) 1881 { 1882 } 1883 1884 static inline void bpf_link_inc(struct bpf_link *link) 1885 { 1886 } 1887 1888 static inline void bpf_link_put(struct bpf_link *link) 1889 { 1890 } 1891 1892 static inline int bpf_obj_get_user(const char __user *pathname, int flags) 1893 { 1894 return -EOPNOTSUPP; 1895 } 1896 1897 static inline void __dev_flush(void) 1898 { 1899 } 1900 1901 struct xdp_frame; 1902 struct bpf_dtab_netdev; 1903 struct bpf_cpu_map_entry; 1904 1905 static inline 1906 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf, 1907 struct net_device *dev_rx) 1908 { 1909 return 0; 1910 } 1911 1912 static inline 1913 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf, 1914 struct net_device *dev_rx) 1915 { 1916 return 0; 1917 } 1918 1919 static inline 1920 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx, 1921 struct bpf_map *map, bool exclude_ingress) 1922 { 1923 return 0; 1924 } 1925 1926 struct sk_buff; 1927 1928 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, 1929 struct sk_buff *skb, 1930 struct bpf_prog *xdp_prog) 1931 { 1932 return 0; 1933 } 1934 1935 static inline 1936 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb, 1937 struct bpf_prog *xdp_prog, struct bpf_map *map, 1938 bool exclude_ingress) 1939 { 1940 return 0; 1941 } 1942 1943 static inline void __cpu_map_flush(void) 1944 { 1945 } 1946 1947 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, 1948 struct xdp_frame *xdpf, 1949 struct net_device *dev_rx) 1950 { 1951 return 0; 1952 } 1953 1954 static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu, 1955 struct sk_buff *skb) 1956 { 1957 return -EOPNOTSUPP; 1958 } 1959 1960 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name, 1961 enum bpf_prog_type type) 1962 { 1963 return ERR_PTR(-EOPNOTSUPP); 1964 } 1965 1966 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog, 1967 const union bpf_attr *kattr, 1968 union bpf_attr __user *uattr) 1969 { 1970 return -ENOTSUPP; 1971 } 1972 1973 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog, 1974 const union bpf_attr *kattr, 1975 union bpf_attr __user *uattr) 1976 { 1977 return -ENOTSUPP; 1978 } 1979 1980 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog, 1981 const union bpf_attr *kattr, 1982 union bpf_attr __user *uattr) 1983 { 1984 return -ENOTSUPP; 1985 } 1986 1987 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, 1988 const union bpf_attr *kattr, 1989 union bpf_attr __user *uattr) 1990 { 1991 return -ENOTSUPP; 1992 } 1993 1994 static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog, 1995 const union bpf_attr *kattr, 1996 union bpf_attr __user *uattr) 1997 { 1998 return -ENOTSUPP; 1999 } 2000 2001 static inline void bpf_map_put(struct bpf_map *map) 2002 { 2003 } 2004 2005 static inline struct bpf_prog *bpf_prog_by_id(u32 id) 2006 { 2007 return ERR_PTR(-ENOTSUPP); 2008 } 2009 2010 static inline const struct bpf_func_proto * 2011 bpf_base_func_proto(enum bpf_func_id func_id) 2012 { 2013 return NULL; 2014 } 2015 2016 static inline void bpf_task_storage_free(struct task_struct *task) 2017 { 2018 } 2019 2020 static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog) 2021 { 2022 return false; 2023 } 2024 2025 static inline const struct btf_func_model * 2026 bpf_jit_find_kfunc_model(const struct bpf_prog *prog, 2027 const struct bpf_insn *insn) 2028 { 2029 return NULL; 2030 } 2031 2032 static inline bool unprivileged_ebpf_enabled(void) 2033 { 2034 return false; 2035 } 2036 2037 #endif /* CONFIG_BPF_SYSCALL */ 2038 2039 void __bpf_free_used_btfs(struct bpf_prog_aux *aux, 2040 struct btf_mod_pair *used_btfs, u32 len); 2041 2042 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd, 2043 enum bpf_prog_type type) 2044 { 2045 return bpf_prog_get_type_dev(ufd, type, false); 2046 } 2047 2048 void __bpf_free_used_maps(struct bpf_prog_aux *aux, 2049 struct bpf_map **used_maps, u32 len); 2050 2051 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool); 2052 2053 int bpf_prog_offload_compile(struct bpf_prog *prog); 2054 void bpf_prog_offload_destroy(struct bpf_prog *prog); 2055 int bpf_prog_offload_info_fill(struct bpf_prog_info *info, 2056 struct bpf_prog *prog); 2057 2058 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map); 2059 2060 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value); 2061 int bpf_map_offload_update_elem(struct bpf_map *map, 2062 void *key, void *value, u64 flags); 2063 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key); 2064 int bpf_map_offload_get_next_key(struct bpf_map *map, 2065 void *key, void *next_key); 2066 2067 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map); 2068 2069 struct bpf_offload_dev * 2070 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv); 2071 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev); 2072 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev); 2073 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev, 2074 struct net_device *netdev); 2075 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev, 2076 struct net_device *netdev); 2077 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev); 2078 2079 void unpriv_ebpf_notify(int new_state); 2080 2081 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL) 2082 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr); 2083 2084 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux) 2085 { 2086 return aux->offload_requested; 2087 } 2088 2089 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 2090 { 2091 return unlikely(map->ops == &bpf_map_offload_ops); 2092 } 2093 2094 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr); 2095 void bpf_map_offload_map_free(struct bpf_map *map); 2096 int bpf_prog_test_run_syscall(struct bpf_prog *prog, 2097 const union bpf_attr *kattr, 2098 union bpf_attr __user *uattr); 2099 2100 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog); 2101 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype); 2102 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags); 2103 int sock_map_bpf_prog_query(const union bpf_attr *attr, 2104 union bpf_attr __user *uattr); 2105 2106 void sock_map_unhash(struct sock *sk); 2107 void sock_map_close(struct sock *sk, long timeout); 2108 #else 2109 static inline int bpf_prog_offload_init(struct bpf_prog *prog, 2110 union bpf_attr *attr) 2111 { 2112 return -EOPNOTSUPP; 2113 } 2114 2115 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux) 2116 { 2117 return false; 2118 } 2119 2120 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 2121 { 2122 return false; 2123 } 2124 2125 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr) 2126 { 2127 return ERR_PTR(-EOPNOTSUPP); 2128 } 2129 2130 static inline void bpf_map_offload_map_free(struct bpf_map *map) 2131 { 2132 } 2133 2134 static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog, 2135 const union bpf_attr *kattr, 2136 union bpf_attr __user *uattr) 2137 { 2138 return -ENOTSUPP; 2139 } 2140 2141 #ifdef CONFIG_BPF_SYSCALL 2142 static inline int sock_map_get_from_fd(const union bpf_attr *attr, 2143 struct bpf_prog *prog) 2144 { 2145 return -EINVAL; 2146 } 2147 2148 static inline int sock_map_prog_detach(const union bpf_attr *attr, 2149 enum bpf_prog_type ptype) 2150 { 2151 return -EOPNOTSUPP; 2152 } 2153 2154 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, 2155 u64 flags) 2156 { 2157 return -EOPNOTSUPP; 2158 } 2159 2160 static inline int sock_map_bpf_prog_query(const union bpf_attr *attr, 2161 union bpf_attr __user *uattr) 2162 { 2163 return -EINVAL; 2164 } 2165 #endif /* CONFIG_BPF_SYSCALL */ 2166 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */ 2167 2168 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) 2169 void bpf_sk_reuseport_detach(struct sock *sk); 2170 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key, 2171 void *value); 2172 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key, 2173 void *value, u64 map_flags); 2174 #else 2175 static inline void bpf_sk_reuseport_detach(struct sock *sk) 2176 { 2177 } 2178 2179 #ifdef CONFIG_BPF_SYSCALL 2180 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, 2181 void *key, void *value) 2182 { 2183 return -EOPNOTSUPP; 2184 } 2185 2186 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, 2187 void *key, void *value, 2188 u64 map_flags) 2189 { 2190 return -EOPNOTSUPP; 2191 } 2192 #endif /* CONFIG_BPF_SYSCALL */ 2193 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */ 2194 2195 /* verifier prototypes for helper functions called from eBPF programs */ 2196 extern const struct bpf_func_proto bpf_map_lookup_elem_proto; 2197 extern const struct bpf_func_proto bpf_map_update_elem_proto; 2198 extern const struct bpf_func_proto bpf_map_delete_elem_proto; 2199 extern const struct bpf_func_proto bpf_map_push_elem_proto; 2200 extern const struct bpf_func_proto bpf_map_pop_elem_proto; 2201 extern const struct bpf_func_proto bpf_map_peek_elem_proto; 2202 extern const struct bpf_func_proto bpf_map_lookup_percpu_elem_proto; 2203 2204 extern const struct bpf_func_proto bpf_get_prandom_u32_proto; 2205 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto; 2206 extern const struct bpf_func_proto bpf_get_numa_node_id_proto; 2207 extern const struct bpf_func_proto bpf_tail_call_proto; 2208 extern const struct bpf_func_proto bpf_ktime_get_ns_proto; 2209 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto; 2210 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto; 2211 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto; 2212 extern const struct bpf_func_proto bpf_get_current_comm_proto; 2213 extern const struct bpf_func_proto bpf_get_stackid_proto; 2214 extern const struct bpf_func_proto bpf_get_stack_proto; 2215 extern const struct bpf_func_proto bpf_get_task_stack_proto; 2216 extern const struct bpf_func_proto bpf_get_stackid_proto_pe; 2217 extern const struct bpf_func_proto bpf_get_stack_proto_pe; 2218 extern const struct bpf_func_proto bpf_sock_map_update_proto; 2219 extern const struct bpf_func_proto bpf_sock_hash_update_proto; 2220 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto; 2221 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto; 2222 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto; 2223 extern const struct bpf_func_proto bpf_msg_redirect_map_proto; 2224 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto; 2225 extern const struct bpf_func_proto bpf_sk_redirect_map_proto; 2226 extern const struct bpf_func_proto bpf_spin_lock_proto; 2227 extern const struct bpf_func_proto bpf_spin_unlock_proto; 2228 extern const struct bpf_func_proto bpf_get_local_storage_proto; 2229 extern const struct bpf_func_proto bpf_strtol_proto; 2230 extern const struct bpf_func_proto bpf_strtoul_proto; 2231 extern const struct bpf_func_proto bpf_tcp_sock_proto; 2232 extern const struct bpf_func_proto bpf_jiffies64_proto; 2233 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto; 2234 extern const struct bpf_func_proto bpf_event_output_data_proto; 2235 extern const struct bpf_func_proto bpf_ringbuf_output_proto; 2236 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto; 2237 extern const struct bpf_func_proto bpf_ringbuf_submit_proto; 2238 extern const struct bpf_func_proto bpf_ringbuf_discard_proto; 2239 extern const struct bpf_func_proto bpf_ringbuf_query_proto; 2240 extern const struct bpf_func_proto bpf_ringbuf_reserve_dynptr_proto; 2241 extern const struct bpf_func_proto bpf_ringbuf_submit_dynptr_proto; 2242 extern const struct bpf_func_proto bpf_ringbuf_discard_dynptr_proto; 2243 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto; 2244 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto; 2245 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto; 2246 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto; 2247 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto; 2248 extern const struct bpf_func_proto bpf_skc_to_unix_sock_proto; 2249 extern const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto; 2250 extern const struct bpf_func_proto bpf_copy_from_user_proto; 2251 extern const struct bpf_func_proto bpf_snprintf_btf_proto; 2252 extern const struct bpf_func_proto bpf_snprintf_proto; 2253 extern const struct bpf_func_proto bpf_per_cpu_ptr_proto; 2254 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto; 2255 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto; 2256 extern const struct bpf_func_proto bpf_sock_from_file_proto; 2257 extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto; 2258 extern const struct bpf_func_proto bpf_task_storage_get_proto; 2259 extern const struct bpf_func_proto bpf_task_storage_delete_proto; 2260 extern const struct bpf_func_proto bpf_for_each_map_elem_proto; 2261 extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto; 2262 extern const struct bpf_func_proto bpf_sk_setsockopt_proto; 2263 extern const struct bpf_func_proto bpf_sk_getsockopt_proto; 2264 extern const struct bpf_func_proto bpf_kallsyms_lookup_name_proto; 2265 extern const struct bpf_func_proto bpf_find_vma_proto; 2266 extern const struct bpf_func_proto bpf_loop_proto; 2267 extern const struct bpf_func_proto bpf_strncmp_proto; 2268 extern const struct bpf_func_proto bpf_copy_from_user_task_proto; 2269 extern const struct bpf_func_proto bpf_kptr_xchg_proto; 2270 2271 const struct bpf_func_proto *tracing_prog_func_proto( 2272 enum bpf_func_id func_id, const struct bpf_prog *prog); 2273 2274 /* Shared helpers among cBPF and eBPF. */ 2275 void bpf_user_rnd_init_once(void); 2276 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 2277 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 2278 2279 #if defined(CONFIG_NET) 2280 bool bpf_sock_common_is_valid_access(int off, int size, 2281 enum bpf_access_type type, 2282 struct bpf_insn_access_aux *info); 2283 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type, 2284 struct bpf_insn_access_aux *info); 2285 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 2286 const struct bpf_insn *si, 2287 struct bpf_insn *insn_buf, 2288 struct bpf_prog *prog, 2289 u32 *target_size); 2290 #else 2291 static inline bool bpf_sock_common_is_valid_access(int off, int size, 2292 enum bpf_access_type type, 2293 struct bpf_insn_access_aux *info) 2294 { 2295 return false; 2296 } 2297 static inline bool bpf_sock_is_valid_access(int off, int size, 2298 enum bpf_access_type type, 2299 struct bpf_insn_access_aux *info) 2300 { 2301 return false; 2302 } 2303 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 2304 const struct bpf_insn *si, 2305 struct bpf_insn *insn_buf, 2306 struct bpf_prog *prog, 2307 u32 *target_size) 2308 { 2309 return 0; 2310 } 2311 #endif 2312 2313 #ifdef CONFIG_INET 2314 struct sk_reuseport_kern { 2315 struct sk_buff *skb; 2316 struct sock *sk; 2317 struct sock *selected_sk; 2318 struct sock *migrating_sk; 2319 void *data_end; 2320 u32 hash; 2321 u32 reuseport_id; 2322 bool bind_inany; 2323 }; 2324 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 2325 struct bpf_insn_access_aux *info); 2326 2327 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, 2328 const struct bpf_insn *si, 2329 struct bpf_insn *insn_buf, 2330 struct bpf_prog *prog, 2331 u32 *target_size); 2332 2333 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 2334 struct bpf_insn_access_aux *info); 2335 2336 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, 2337 const struct bpf_insn *si, 2338 struct bpf_insn *insn_buf, 2339 struct bpf_prog *prog, 2340 u32 *target_size); 2341 #else 2342 static inline bool bpf_tcp_sock_is_valid_access(int off, int size, 2343 enum bpf_access_type type, 2344 struct bpf_insn_access_aux *info) 2345 { 2346 return false; 2347 } 2348 2349 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, 2350 const struct bpf_insn *si, 2351 struct bpf_insn *insn_buf, 2352 struct bpf_prog *prog, 2353 u32 *target_size) 2354 { 2355 return 0; 2356 } 2357 static inline bool bpf_xdp_sock_is_valid_access(int off, int size, 2358 enum bpf_access_type type, 2359 struct bpf_insn_access_aux *info) 2360 { 2361 return false; 2362 } 2363 2364 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, 2365 const struct bpf_insn *si, 2366 struct bpf_insn *insn_buf, 2367 struct bpf_prog *prog, 2368 u32 *target_size) 2369 { 2370 return 0; 2371 } 2372 #endif /* CONFIG_INET */ 2373 2374 enum bpf_text_poke_type { 2375 BPF_MOD_CALL, 2376 BPF_MOD_JUMP, 2377 }; 2378 2379 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t, 2380 void *addr1, void *addr2); 2381 2382 void *bpf_arch_text_copy(void *dst, void *src, size_t len); 2383 int bpf_arch_text_invalidate(void *dst, size_t len); 2384 2385 struct btf_id_set; 2386 bool btf_id_set_contains(const struct btf_id_set *set, u32 id); 2387 2388 #define MAX_BPRINTF_VARARGS 12 2389 2390 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args, 2391 u32 **bin_buf, u32 num_args); 2392 void bpf_bprintf_cleanup(void); 2393 2394 /* the implementation of the opaque uapi struct bpf_dynptr */ 2395 struct bpf_dynptr_kern { 2396 void *data; 2397 /* Size represents the number of usable bytes of dynptr data. 2398 * If for example the offset is at 4 for a local dynptr whose data is 2399 * of type u64, the number of usable bytes is 4. 2400 * 2401 * The upper 8 bits are reserved. It is as follows: 2402 * Bits 0 - 23 = size 2403 * Bits 24 - 30 = dynptr type 2404 * Bit 31 = whether dynptr is read-only 2405 */ 2406 u32 size; 2407 u32 offset; 2408 } __aligned(8); 2409 2410 enum bpf_dynptr_type { 2411 BPF_DYNPTR_TYPE_INVALID, 2412 /* Points to memory that is local to the bpf program */ 2413 BPF_DYNPTR_TYPE_LOCAL, 2414 /* Underlying data is a ringbuf record */ 2415 BPF_DYNPTR_TYPE_RINGBUF, 2416 }; 2417 2418 void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data, 2419 enum bpf_dynptr_type type, u32 offset, u32 size); 2420 void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr); 2421 int bpf_dynptr_check_size(u32 size); 2422 2423 #endif /* _LINUX_BPF_H */ 2424