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