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