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