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