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