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 u64 writecnt; /* writable mmap cnt; protected by freeze_mutex */ 197 }; 198 199 static inline bool map_value_has_spin_lock(const struct bpf_map *map) 200 { 201 return map->spin_lock_off >= 0; 202 } 203 204 static inline bool map_value_has_timer(const struct bpf_map *map) 205 { 206 return map->timer_off >= 0; 207 } 208 209 static inline void check_and_init_map_value(struct bpf_map *map, void *dst) 210 { 211 if (unlikely(map_value_has_spin_lock(map))) 212 *(struct bpf_spin_lock *)(dst + map->spin_lock_off) = 213 (struct bpf_spin_lock){}; 214 if (unlikely(map_value_has_timer(map))) 215 *(struct bpf_timer *)(dst + map->timer_off) = 216 (struct bpf_timer){}; 217 } 218 219 /* copy everything but bpf_spin_lock and bpf_timer. There could be one of each. */ 220 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src) 221 { 222 u32 s_off = 0, s_sz = 0, t_off = 0, t_sz = 0; 223 224 if (unlikely(map_value_has_spin_lock(map))) { 225 s_off = map->spin_lock_off; 226 s_sz = sizeof(struct bpf_spin_lock); 227 } else if (unlikely(map_value_has_timer(map))) { 228 t_off = map->timer_off; 229 t_sz = sizeof(struct bpf_timer); 230 } 231 232 if (unlikely(s_sz || t_sz)) { 233 if (s_off < t_off || !s_sz) { 234 swap(s_off, t_off); 235 swap(s_sz, t_sz); 236 } 237 memcpy(dst, src, t_off); 238 memcpy(dst + t_off + t_sz, 239 src + t_off + t_sz, 240 s_off - t_off - t_sz); 241 memcpy(dst + s_off + s_sz, 242 src + s_off + s_sz, 243 map->value_size - s_off - s_sz); 244 } else { 245 memcpy(dst, src, map->value_size); 246 } 247 } 248 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src, 249 bool lock_src); 250 void bpf_timer_cancel_and_free(void *timer); 251 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size); 252 253 struct bpf_offload_dev; 254 struct bpf_offloaded_map; 255 256 struct bpf_map_dev_ops { 257 int (*map_get_next_key)(struct bpf_offloaded_map *map, 258 void *key, void *next_key); 259 int (*map_lookup_elem)(struct bpf_offloaded_map *map, 260 void *key, void *value); 261 int (*map_update_elem)(struct bpf_offloaded_map *map, 262 void *key, void *value, u64 flags); 263 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key); 264 }; 265 266 struct bpf_offloaded_map { 267 struct bpf_map map; 268 struct net_device *netdev; 269 const struct bpf_map_dev_ops *dev_ops; 270 void *dev_priv; 271 struct list_head offloads; 272 }; 273 274 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map) 275 { 276 return container_of(map, struct bpf_offloaded_map, map); 277 } 278 279 static inline bool bpf_map_offload_neutral(const struct bpf_map *map) 280 { 281 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY; 282 } 283 284 static inline bool bpf_map_support_seq_show(const struct bpf_map *map) 285 { 286 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) && 287 map->ops->map_seq_show_elem; 288 } 289 290 int map_check_no_btf(const struct bpf_map *map, 291 const struct btf *btf, 292 const struct btf_type *key_type, 293 const struct btf_type *value_type); 294 295 bool bpf_map_meta_equal(const struct bpf_map *meta0, 296 const struct bpf_map *meta1); 297 298 extern const struct bpf_map_ops bpf_map_offload_ops; 299 300 /* function argument constraints */ 301 enum bpf_arg_type { 302 ARG_DONTCARE = 0, /* unused argument in helper function */ 303 304 /* the following constraints used to prototype 305 * bpf_map_lookup/update/delete_elem() functions 306 */ 307 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */ 308 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */ 309 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */ 310 ARG_PTR_TO_UNINIT_MAP_VALUE, /* pointer to valid memory used to store a map value */ 311 ARG_PTR_TO_MAP_VALUE_OR_NULL, /* pointer to stack used as map value or NULL */ 312 313 /* the following constraints used to prototype bpf_memcmp() and other 314 * functions that access data on eBPF program stack 315 */ 316 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */ 317 ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */ 318 ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized, 319 * helper function must fill all bytes or clear 320 * them in error case. 321 */ 322 323 ARG_CONST_SIZE, /* number of bytes accessed from memory */ 324 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */ 325 326 ARG_PTR_TO_CTX, /* pointer to context */ 327 ARG_PTR_TO_CTX_OR_NULL, /* pointer to context or NULL */ 328 ARG_ANYTHING, /* any (initialized) argument is ok */ 329 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */ 330 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */ 331 ARG_PTR_TO_INT, /* pointer to int */ 332 ARG_PTR_TO_LONG, /* pointer to long */ 333 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */ 334 ARG_PTR_TO_SOCKET_OR_NULL, /* pointer to bpf_sock (fullsock) or NULL */ 335 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */ 336 ARG_PTR_TO_ALLOC_MEM, /* pointer to dynamically allocated memory */ 337 ARG_PTR_TO_ALLOC_MEM_OR_NULL, /* pointer to dynamically allocated memory or NULL */ 338 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */ 339 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */ 340 ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */ 341 ARG_PTR_TO_FUNC, /* pointer to a bpf program function */ 342 ARG_PTR_TO_STACK_OR_NULL, /* pointer to stack or NULL */ 343 ARG_PTR_TO_CONST_STR, /* pointer to a null terminated read-only string */ 344 ARG_PTR_TO_TIMER, /* pointer to bpf_timer */ 345 __BPF_ARG_TYPE_MAX, 346 }; 347 348 /* type of values returned from helper functions */ 349 enum bpf_return_type { 350 RET_INTEGER, /* function returns integer */ 351 RET_VOID, /* function doesn't return anything */ 352 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */ 353 RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */ 354 RET_PTR_TO_SOCKET_OR_NULL, /* returns a pointer to a socket or NULL */ 355 RET_PTR_TO_TCP_SOCK_OR_NULL, /* returns a pointer to a tcp_sock or NULL */ 356 RET_PTR_TO_SOCK_COMMON_OR_NULL, /* returns a pointer to a sock_common or NULL */ 357 RET_PTR_TO_ALLOC_MEM_OR_NULL, /* returns a pointer to dynamically allocated memory or NULL */ 358 RET_PTR_TO_BTF_ID_OR_NULL, /* returns a pointer to a btf_id or NULL */ 359 RET_PTR_TO_MEM_OR_BTF_ID_OR_NULL, /* returns a pointer to a valid memory or a btf_id or NULL */ 360 RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */ 361 RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */ 362 }; 363 364 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs 365 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL 366 * instructions after verifying 367 */ 368 struct bpf_func_proto { 369 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 370 bool gpl_only; 371 bool pkt_access; 372 enum bpf_return_type ret_type; 373 union { 374 struct { 375 enum bpf_arg_type arg1_type; 376 enum bpf_arg_type arg2_type; 377 enum bpf_arg_type arg3_type; 378 enum bpf_arg_type arg4_type; 379 enum bpf_arg_type arg5_type; 380 }; 381 enum bpf_arg_type arg_type[5]; 382 }; 383 union { 384 struct { 385 u32 *arg1_btf_id; 386 u32 *arg2_btf_id; 387 u32 *arg3_btf_id; 388 u32 *arg4_btf_id; 389 u32 *arg5_btf_id; 390 }; 391 u32 *arg_btf_id[5]; 392 }; 393 int *ret_btf_id; /* return value btf_id */ 394 bool (*allowed)(const struct bpf_prog *prog); 395 }; 396 397 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is 398 * the first argument to eBPF programs. 399 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *' 400 */ 401 struct bpf_context; 402 403 enum bpf_access_type { 404 BPF_READ = 1, 405 BPF_WRITE = 2 406 }; 407 408 /* types of values stored in eBPF registers */ 409 /* Pointer types represent: 410 * pointer 411 * pointer + imm 412 * pointer + (u16) var 413 * pointer + (u16) var + imm 414 * if (range > 0) then [ptr, ptr + range - off) is safe to access 415 * if (id > 0) means that some 'var' was added 416 * if (off > 0) means that 'imm' was added 417 */ 418 enum bpf_reg_type { 419 NOT_INIT = 0, /* nothing was written into register */ 420 SCALAR_VALUE, /* reg doesn't contain a valid pointer */ 421 PTR_TO_CTX, /* reg points to bpf_context */ 422 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */ 423 PTR_TO_MAP_VALUE, /* reg points to map element value */ 424 PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */ 425 PTR_TO_STACK, /* reg == frame_pointer + offset */ 426 PTR_TO_PACKET_META, /* skb->data - meta_len */ 427 PTR_TO_PACKET, /* reg points to skb->data */ 428 PTR_TO_PACKET_END, /* skb->data + headlen */ 429 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */ 430 PTR_TO_SOCKET, /* reg points to struct bpf_sock */ 431 PTR_TO_SOCKET_OR_NULL, /* reg points to struct bpf_sock or NULL */ 432 PTR_TO_SOCK_COMMON, /* reg points to sock_common */ 433 PTR_TO_SOCK_COMMON_OR_NULL, /* reg points to sock_common or NULL */ 434 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */ 435 PTR_TO_TCP_SOCK_OR_NULL, /* reg points to struct tcp_sock or NULL */ 436 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */ 437 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */ 438 /* PTR_TO_BTF_ID points to a kernel struct that does not need 439 * to be null checked by the BPF program. This does not imply the 440 * pointer is _not_ null and in practice this can easily be a null 441 * pointer when reading pointer chains. The assumption is program 442 * context will handle null pointer dereference typically via fault 443 * handling. The verifier must keep this in mind and can make no 444 * assumptions about null or non-null when doing branch analysis. 445 * Further, when passed into helpers the helpers can not, without 446 * additional context, assume the value is non-null. 447 */ 448 PTR_TO_BTF_ID, 449 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not 450 * been checked for null. Used primarily to inform the verifier 451 * an explicit null check is required for this struct. 452 */ 453 PTR_TO_BTF_ID_OR_NULL, 454 PTR_TO_MEM, /* reg points to valid memory region */ 455 PTR_TO_MEM_OR_NULL, /* reg points to valid memory region or NULL */ 456 PTR_TO_RDONLY_BUF, /* reg points to a readonly buffer */ 457 PTR_TO_RDONLY_BUF_OR_NULL, /* reg points to a readonly buffer or NULL */ 458 PTR_TO_RDWR_BUF, /* reg points to a read/write buffer */ 459 PTR_TO_RDWR_BUF_OR_NULL, /* reg points to a read/write buffer or NULL */ 460 PTR_TO_PERCPU_BTF_ID, /* reg points to a percpu kernel variable */ 461 PTR_TO_FUNC, /* reg points to a bpf program function */ 462 PTR_TO_MAP_KEY, /* reg points to a map element key */ 463 __BPF_REG_TYPE_MAX, 464 }; 465 466 /* The information passed from prog-specific *_is_valid_access 467 * back to the verifier. 468 */ 469 struct bpf_insn_access_aux { 470 enum bpf_reg_type reg_type; 471 union { 472 int ctx_field_size; 473 struct { 474 struct btf *btf; 475 u32 btf_id; 476 }; 477 }; 478 struct bpf_verifier_log *log; /* for verbose logs */ 479 }; 480 481 static inline void 482 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size) 483 { 484 aux->ctx_field_size = size; 485 } 486 487 struct bpf_prog_ops { 488 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr, 489 union bpf_attr __user *uattr); 490 }; 491 492 struct bpf_verifier_ops { 493 /* return eBPF function prototype for verification */ 494 const struct bpf_func_proto * 495 (*get_func_proto)(enum bpf_func_id func_id, 496 const struct bpf_prog *prog); 497 498 /* return true if 'size' wide access at offset 'off' within bpf_context 499 * with 'type' (read or write) is allowed 500 */ 501 bool (*is_valid_access)(int off, int size, enum bpf_access_type type, 502 const struct bpf_prog *prog, 503 struct bpf_insn_access_aux *info); 504 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write, 505 const struct bpf_prog *prog); 506 int (*gen_ld_abs)(const struct bpf_insn *orig, 507 struct bpf_insn *insn_buf); 508 u32 (*convert_ctx_access)(enum bpf_access_type type, 509 const struct bpf_insn *src, 510 struct bpf_insn *dst, 511 struct bpf_prog *prog, u32 *target_size); 512 int (*btf_struct_access)(struct bpf_verifier_log *log, 513 const struct btf *btf, 514 const struct btf_type *t, int off, int size, 515 enum bpf_access_type atype, 516 u32 *next_btf_id); 517 bool (*check_kfunc_call)(u32 kfunc_btf_id, struct module *owner); 518 }; 519 520 struct bpf_prog_offload_ops { 521 /* verifier basic callbacks */ 522 int (*insn_hook)(struct bpf_verifier_env *env, 523 int insn_idx, int prev_insn_idx); 524 int (*finalize)(struct bpf_verifier_env *env); 525 /* verifier optimization callbacks (called after .finalize) */ 526 int (*replace_insn)(struct bpf_verifier_env *env, u32 off, 527 struct bpf_insn *insn); 528 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt); 529 /* program management callbacks */ 530 int (*prepare)(struct bpf_prog *prog); 531 int (*translate)(struct bpf_prog *prog); 532 void (*destroy)(struct bpf_prog *prog); 533 }; 534 535 struct bpf_prog_offload { 536 struct bpf_prog *prog; 537 struct net_device *netdev; 538 struct bpf_offload_dev *offdev; 539 void *dev_priv; 540 struct list_head offloads; 541 bool dev_state; 542 bool opt_failed; 543 void *jited_image; 544 u32 jited_len; 545 }; 546 547 enum bpf_cgroup_storage_type { 548 BPF_CGROUP_STORAGE_SHARED, 549 BPF_CGROUP_STORAGE_PERCPU, 550 __BPF_CGROUP_STORAGE_MAX 551 }; 552 553 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX 554 555 /* The longest tracepoint has 12 args. 556 * See include/trace/bpf_probe.h 557 */ 558 #define MAX_BPF_FUNC_ARGS 12 559 560 /* The maximum number of arguments passed through registers 561 * a single function may have. 562 */ 563 #define MAX_BPF_FUNC_REG_ARGS 5 564 565 struct btf_func_model { 566 u8 ret_size; 567 u8 nr_args; 568 u8 arg_size[MAX_BPF_FUNC_ARGS]; 569 }; 570 571 /* Restore arguments before returning from trampoline to let original function 572 * continue executing. This flag is used for fentry progs when there are no 573 * fexit progs. 574 */ 575 #define BPF_TRAMP_F_RESTORE_REGS BIT(0) 576 /* Call original function after fentry progs, but before fexit progs. 577 * Makes sense for fentry/fexit, normal calls and indirect calls. 578 */ 579 #define BPF_TRAMP_F_CALL_ORIG BIT(1) 580 /* Skip current frame and return to parent. Makes sense for fentry/fexit 581 * programs only. Should not be used with normal calls and indirect calls. 582 */ 583 #define BPF_TRAMP_F_SKIP_FRAME BIT(2) 584 /* Store IP address of the caller on the trampoline stack, 585 * so it's available for trampoline's programs. 586 */ 587 #define BPF_TRAMP_F_IP_ARG BIT(3) 588 /* Return the return value of fentry prog. Only used by bpf_struct_ops. */ 589 #define BPF_TRAMP_F_RET_FENTRY_RET BIT(4) 590 591 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50 592 * bytes on x86. Pick a number to fit into BPF_IMAGE_SIZE / 2 593 */ 594 #define BPF_MAX_TRAMP_PROGS 38 595 596 struct bpf_tramp_progs { 597 struct bpf_prog *progs[BPF_MAX_TRAMP_PROGS]; 598 int nr_progs; 599 }; 600 601 /* Different use cases for BPF trampoline: 602 * 1. replace nop at the function entry (kprobe equivalent) 603 * flags = BPF_TRAMP_F_RESTORE_REGS 604 * fentry = a set of programs to run before returning from trampoline 605 * 606 * 2. replace nop at the function entry (kprobe + kretprobe equivalent) 607 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME 608 * orig_call = fentry_ip + MCOUNT_INSN_SIZE 609 * fentry = a set of program to run before calling original function 610 * fexit = a set of program to run after original function 611 * 612 * 3. replace direct call instruction anywhere in the function body 613 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid) 614 * With flags = 0 615 * fentry = a set of programs to run before returning from trampoline 616 * With flags = BPF_TRAMP_F_CALL_ORIG 617 * orig_call = original callback addr or direct function addr 618 * fentry = a set of program to run before calling original function 619 * fexit = a set of program to run after original function 620 */ 621 struct bpf_tramp_image; 622 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *tr, void *image, void *image_end, 623 const struct btf_func_model *m, u32 flags, 624 struct bpf_tramp_progs *tprogs, 625 void *orig_call); 626 /* these two functions are called from generated trampoline */ 627 u64 notrace __bpf_prog_enter(struct bpf_prog *prog); 628 void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start); 629 u64 notrace __bpf_prog_enter_sleepable(struct bpf_prog *prog); 630 void notrace __bpf_prog_exit_sleepable(struct bpf_prog *prog, u64 start); 631 void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr); 632 void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr); 633 634 struct bpf_ksym { 635 unsigned long start; 636 unsigned long end; 637 char name[KSYM_NAME_LEN]; 638 struct list_head lnode; 639 struct latch_tree_node tnode; 640 bool prog; 641 }; 642 643 enum bpf_tramp_prog_type { 644 BPF_TRAMP_FENTRY, 645 BPF_TRAMP_FEXIT, 646 BPF_TRAMP_MODIFY_RETURN, 647 BPF_TRAMP_MAX, 648 BPF_TRAMP_REPLACE, /* more than MAX */ 649 }; 650 651 struct bpf_tramp_image { 652 void *image; 653 struct bpf_ksym ksym; 654 struct percpu_ref pcref; 655 void *ip_after_call; 656 void *ip_epilogue; 657 union { 658 struct rcu_head rcu; 659 struct work_struct work; 660 }; 661 }; 662 663 struct bpf_trampoline { 664 /* hlist for trampoline_table */ 665 struct hlist_node hlist; 666 /* serializes access to fields of this trampoline */ 667 struct mutex mutex; 668 refcount_t refcnt; 669 u64 key; 670 struct { 671 struct btf_func_model model; 672 void *addr; 673 bool ftrace_managed; 674 } func; 675 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF 676 * program by replacing one of its functions. func.addr is the address 677 * of the function it replaced. 678 */ 679 struct bpf_prog *extension_prog; 680 /* list of BPF programs using this trampoline */ 681 struct hlist_head progs_hlist[BPF_TRAMP_MAX]; 682 /* Number of attached programs. A counter per kind. */ 683 int progs_cnt[BPF_TRAMP_MAX]; 684 /* Executable image of trampoline */ 685 struct bpf_tramp_image *cur_image; 686 u64 selector; 687 struct module *mod; 688 }; 689 690 struct bpf_attach_target_info { 691 struct btf_func_model fmodel; 692 long tgt_addr; 693 const char *tgt_name; 694 const struct btf_type *tgt_type; 695 }; 696 697 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */ 698 699 struct bpf_dispatcher_prog { 700 struct bpf_prog *prog; 701 refcount_t users; 702 }; 703 704 struct bpf_dispatcher { 705 /* dispatcher mutex */ 706 struct mutex mutex; 707 void *func; 708 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX]; 709 int num_progs; 710 void *image; 711 u32 image_off; 712 struct bpf_ksym ksym; 713 }; 714 715 static __always_inline __nocfi unsigned int bpf_dispatcher_nop_func( 716 const void *ctx, 717 const struct bpf_insn *insnsi, 718 unsigned int (*bpf_func)(const void *, 719 const struct bpf_insn *)) 720 { 721 return bpf_func(ctx, insnsi); 722 } 723 #ifdef CONFIG_BPF_JIT 724 int bpf_trampoline_link_prog(struct bpf_prog *prog, struct bpf_trampoline *tr); 725 int bpf_trampoline_unlink_prog(struct bpf_prog *prog, struct bpf_trampoline *tr); 726 struct bpf_trampoline *bpf_trampoline_get(u64 key, 727 struct bpf_attach_target_info *tgt_info); 728 void bpf_trampoline_put(struct bpf_trampoline *tr); 729 #define BPF_DISPATCHER_INIT(_name) { \ 730 .mutex = __MUTEX_INITIALIZER(_name.mutex), \ 731 .func = &_name##_func, \ 732 .progs = {}, \ 733 .num_progs = 0, \ 734 .image = NULL, \ 735 .image_off = 0, \ 736 .ksym = { \ 737 .name = #_name, \ 738 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \ 739 }, \ 740 } 741 742 #define DEFINE_BPF_DISPATCHER(name) \ 743 noinline __nocfi unsigned int bpf_dispatcher_##name##_func( \ 744 const void *ctx, \ 745 const struct bpf_insn *insnsi, \ 746 unsigned int (*bpf_func)(const void *, \ 747 const struct bpf_insn *)) \ 748 { \ 749 return bpf_func(ctx, insnsi); \ 750 } \ 751 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \ 752 struct bpf_dispatcher bpf_dispatcher_##name = \ 753 BPF_DISPATCHER_INIT(bpf_dispatcher_##name); 754 #define DECLARE_BPF_DISPATCHER(name) \ 755 unsigned int bpf_dispatcher_##name##_func( \ 756 const void *ctx, \ 757 const struct bpf_insn *insnsi, \ 758 unsigned int (*bpf_func)(const void *, \ 759 const struct bpf_insn *)); \ 760 extern struct bpf_dispatcher bpf_dispatcher_##name; 761 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func 762 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name) 763 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from, 764 struct bpf_prog *to); 765 /* Called only from JIT-enabled code, so there's no need for stubs. */ 766 void *bpf_jit_alloc_exec_page(void); 767 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym); 768 void bpf_image_ksym_del(struct bpf_ksym *ksym); 769 void bpf_ksym_add(struct bpf_ksym *ksym); 770 void bpf_ksym_del(struct bpf_ksym *ksym); 771 int bpf_jit_charge_modmem(u32 pages); 772 void bpf_jit_uncharge_modmem(u32 pages); 773 #else 774 static inline int bpf_trampoline_link_prog(struct bpf_prog *prog, 775 struct bpf_trampoline *tr) 776 { 777 return -ENOTSUPP; 778 } 779 static inline int bpf_trampoline_unlink_prog(struct bpf_prog *prog, 780 struct bpf_trampoline *tr) 781 { 782 return -ENOTSUPP; 783 } 784 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key, 785 struct bpf_attach_target_info *tgt_info) 786 { 787 return ERR_PTR(-EOPNOTSUPP); 788 } 789 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {} 790 #define DEFINE_BPF_DISPATCHER(name) 791 #define DECLARE_BPF_DISPATCHER(name) 792 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func 793 #define BPF_DISPATCHER_PTR(name) NULL 794 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, 795 struct bpf_prog *from, 796 struct bpf_prog *to) {} 797 static inline bool is_bpf_image_address(unsigned long address) 798 { 799 return false; 800 } 801 #endif 802 803 struct bpf_func_info_aux { 804 u16 linkage; 805 bool unreliable; 806 }; 807 808 enum bpf_jit_poke_reason { 809 BPF_POKE_REASON_TAIL_CALL, 810 }; 811 812 /* Descriptor of pokes pointing /into/ the JITed image. */ 813 struct bpf_jit_poke_descriptor { 814 void *tailcall_target; 815 void *tailcall_bypass; 816 void *bypass_addr; 817 void *aux; 818 union { 819 struct { 820 struct bpf_map *map; 821 u32 key; 822 } tail_call; 823 }; 824 bool tailcall_target_stable; 825 u8 adj_off; 826 u16 reason; 827 u32 insn_idx; 828 }; 829 830 /* reg_type info for ctx arguments */ 831 struct bpf_ctx_arg_aux { 832 u32 offset; 833 enum bpf_reg_type reg_type; 834 u32 btf_id; 835 }; 836 837 struct btf_mod_pair { 838 struct btf *btf; 839 struct module *module; 840 }; 841 842 struct bpf_kfunc_desc_tab; 843 844 struct bpf_prog_aux { 845 atomic64_t refcnt; 846 u32 used_map_cnt; 847 u32 used_btf_cnt; 848 u32 max_ctx_offset; 849 u32 max_pkt_offset; 850 u32 max_tp_access; 851 u32 stack_depth; 852 u32 id; 853 u32 func_cnt; /* used by non-func prog as the number of func progs */ 854 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */ 855 u32 attach_btf_id; /* in-kernel BTF type id to attach to */ 856 u32 ctx_arg_info_size; 857 u32 max_rdonly_access; 858 u32 max_rdwr_access; 859 struct btf *attach_btf; 860 const struct bpf_ctx_arg_aux *ctx_arg_info; 861 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */ 862 struct bpf_prog *dst_prog; 863 struct bpf_trampoline *dst_trampoline; 864 enum bpf_prog_type saved_dst_prog_type; 865 enum bpf_attach_type saved_dst_attach_type; 866 bool verifier_zext; /* Zero extensions has been inserted by verifier. */ 867 bool offload_requested; 868 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */ 869 bool func_proto_unreliable; 870 bool sleepable; 871 bool tail_call_reachable; 872 struct hlist_node tramp_hlist; 873 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */ 874 const struct btf_type *attach_func_proto; 875 /* function name for valid attach_btf_id */ 876 const char *attach_func_name; 877 struct bpf_prog **func; 878 void *jit_data; /* JIT specific data. arch dependent */ 879 struct bpf_jit_poke_descriptor *poke_tab; 880 struct bpf_kfunc_desc_tab *kfunc_tab; 881 struct bpf_kfunc_btf_tab *kfunc_btf_tab; 882 u32 size_poke_tab; 883 struct bpf_ksym ksym; 884 const struct bpf_prog_ops *ops; 885 struct bpf_map **used_maps; 886 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */ 887 struct btf_mod_pair *used_btfs; 888 struct bpf_prog *prog; 889 struct user_struct *user; 890 u64 load_time; /* ns since boottime */ 891 u32 verified_insns; 892 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]; 893 char name[BPF_OBJ_NAME_LEN]; 894 #ifdef CONFIG_SECURITY 895 void *security; 896 #endif 897 struct bpf_prog_offload *offload; 898 struct btf *btf; 899 struct bpf_func_info *func_info; 900 struct bpf_func_info_aux *func_info_aux; 901 /* bpf_line_info loaded from userspace. linfo->insn_off 902 * has the xlated insn offset. 903 * Both the main and sub prog share the same linfo. 904 * The subprog can access its first linfo by 905 * using the linfo_idx. 906 */ 907 struct bpf_line_info *linfo; 908 /* jited_linfo is the jited addr of the linfo. It has a 909 * one to one mapping to linfo: 910 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off. 911 * Both the main and sub prog share the same jited_linfo. 912 * The subprog can access its first jited_linfo by 913 * using the linfo_idx. 914 */ 915 void **jited_linfo; 916 u32 func_info_cnt; 917 u32 nr_linfo; 918 /* subprog can use linfo_idx to access its first linfo and 919 * jited_linfo. 920 * main prog always has linfo_idx == 0 921 */ 922 u32 linfo_idx; 923 u32 num_exentries; 924 struct exception_table_entry *extable; 925 union { 926 struct work_struct work; 927 struct rcu_head rcu; 928 }; 929 }; 930 931 struct bpf_array_aux { 932 /* 'Ownership' of prog array is claimed by the first program that 933 * is going to use this map or by the first program which FD is 934 * stored in the map to make sure that all callers and callees have 935 * the same prog type and JITed flag. 936 */ 937 struct { 938 spinlock_t lock; 939 enum bpf_prog_type type; 940 bool jited; 941 } owner; 942 /* Programs with direct jumps into programs part of this array. */ 943 struct list_head poke_progs; 944 struct bpf_map *map; 945 struct mutex poke_mutex; 946 struct work_struct work; 947 }; 948 949 struct bpf_link { 950 atomic64_t refcnt; 951 u32 id; 952 enum bpf_link_type type; 953 const struct bpf_link_ops *ops; 954 struct bpf_prog *prog; 955 struct work_struct work; 956 }; 957 958 struct bpf_link_ops { 959 void (*release)(struct bpf_link *link); 960 void (*dealloc)(struct bpf_link *link); 961 int (*detach)(struct bpf_link *link); 962 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog, 963 struct bpf_prog *old_prog); 964 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq); 965 int (*fill_link_info)(const struct bpf_link *link, 966 struct bpf_link_info *info); 967 }; 968 969 struct bpf_link_primer { 970 struct bpf_link *link; 971 struct file *file; 972 int fd; 973 u32 id; 974 }; 975 976 struct bpf_struct_ops_value; 977 struct btf_member; 978 979 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64 980 struct bpf_struct_ops { 981 const struct bpf_verifier_ops *verifier_ops; 982 int (*init)(struct btf *btf); 983 int (*check_member)(const struct btf_type *t, 984 const struct btf_member *member); 985 int (*init_member)(const struct btf_type *t, 986 const struct btf_member *member, 987 void *kdata, const void *udata); 988 int (*reg)(void *kdata); 989 void (*unreg)(void *kdata); 990 const struct btf_type *type; 991 const struct btf_type *value_type; 992 const char *name; 993 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS]; 994 u32 type_id; 995 u32 value_id; 996 }; 997 998 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL) 999 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA)) 1000 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id); 1001 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log); 1002 bool bpf_struct_ops_get(const void *kdata); 1003 void bpf_struct_ops_put(const void *kdata); 1004 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key, 1005 void *value); 1006 int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_progs *tprogs, 1007 struct bpf_prog *prog, 1008 const struct btf_func_model *model, 1009 void *image, void *image_end); 1010 static inline bool bpf_try_module_get(const void *data, struct module *owner) 1011 { 1012 if (owner == BPF_MODULE_OWNER) 1013 return bpf_struct_ops_get(data); 1014 else 1015 return try_module_get(owner); 1016 } 1017 static inline void bpf_module_put(const void *data, struct module *owner) 1018 { 1019 if (owner == BPF_MODULE_OWNER) 1020 bpf_struct_ops_put(data); 1021 else 1022 module_put(owner); 1023 } 1024 1025 #ifdef CONFIG_NET 1026 /* Define it here to avoid the use of forward declaration */ 1027 struct bpf_dummy_ops_state { 1028 int val; 1029 }; 1030 1031 struct bpf_dummy_ops { 1032 int (*test_1)(struct bpf_dummy_ops_state *cb); 1033 int (*test_2)(struct bpf_dummy_ops_state *cb, int a1, unsigned short a2, 1034 char a3, unsigned long a4); 1035 }; 1036 1037 int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr, 1038 union bpf_attr __user *uattr); 1039 #endif 1040 #else 1041 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id) 1042 { 1043 return NULL; 1044 } 1045 static inline void bpf_struct_ops_init(struct btf *btf, 1046 struct bpf_verifier_log *log) 1047 { 1048 } 1049 static inline bool bpf_try_module_get(const void *data, struct module *owner) 1050 { 1051 return try_module_get(owner); 1052 } 1053 static inline void bpf_module_put(const void *data, struct module *owner) 1054 { 1055 module_put(owner); 1056 } 1057 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, 1058 void *key, 1059 void *value) 1060 { 1061 return -EINVAL; 1062 } 1063 #endif 1064 1065 struct bpf_array { 1066 struct bpf_map map; 1067 u32 elem_size; 1068 u32 index_mask; 1069 struct bpf_array_aux *aux; 1070 union { 1071 char value[0] __aligned(8); 1072 void *ptrs[0] __aligned(8); 1073 void __percpu *pptrs[0] __aligned(8); 1074 }; 1075 }; 1076 1077 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */ 1078 #define MAX_TAIL_CALL_CNT 32 1079 1080 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \ 1081 BPF_F_RDONLY_PROG | \ 1082 BPF_F_WRONLY | \ 1083 BPF_F_WRONLY_PROG) 1084 1085 #define BPF_MAP_CAN_READ BIT(0) 1086 #define BPF_MAP_CAN_WRITE BIT(1) 1087 1088 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map) 1089 { 1090 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG); 1091 1092 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is 1093 * not possible. 1094 */ 1095 if (access_flags & BPF_F_RDONLY_PROG) 1096 return BPF_MAP_CAN_READ; 1097 else if (access_flags & BPF_F_WRONLY_PROG) 1098 return BPF_MAP_CAN_WRITE; 1099 else 1100 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE; 1101 } 1102 1103 static inline bool bpf_map_flags_access_ok(u32 access_flags) 1104 { 1105 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) != 1106 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG); 1107 } 1108 1109 struct bpf_event_entry { 1110 struct perf_event *event; 1111 struct file *perf_file; 1112 struct file *map_file; 1113 struct rcu_head rcu; 1114 }; 1115 1116 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp); 1117 int bpf_prog_calc_tag(struct bpf_prog *fp); 1118 1119 const struct bpf_func_proto *bpf_get_trace_printk_proto(void); 1120 const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void); 1121 1122 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src, 1123 unsigned long off, unsigned long len); 1124 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type, 1125 const struct bpf_insn *src, 1126 struct bpf_insn *dst, 1127 struct bpf_prog *prog, 1128 u32 *target_size); 1129 1130 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, 1131 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy); 1132 1133 /* an array of programs to be executed under rcu_lock. 1134 * 1135 * Typical usage: 1136 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, bpf_prog_run); 1137 * 1138 * the structure returned by bpf_prog_array_alloc() should be populated 1139 * with program pointers and the last pointer must be NULL. 1140 * The user has to keep refcnt on the program and make sure the program 1141 * is removed from the array before bpf_prog_put(). 1142 * The 'struct bpf_prog_array *' should only be replaced with xchg() 1143 * since other cpus are walking the array of pointers in parallel. 1144 */ 1145 struct bpf_prog_array_item { 1146 struct bpf_prog *prog; 1147 union { 1148 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]; 1149 u64 bpf_cookie; 1150 }; 1151 }; 1152 1153 struct bpf_prog_array { 1154 struct rcu_head rcu; 1155 struct bpf_prog_array_item items[]; 1156 }; 1157 1158 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags); 1159 void bpf_prog_array_free(struct bpf_prog_array *progs); 1160 int bpf_prog_array_length(struct bpf_prog_array *progs); 1161 bool bpf_prog_array_is_empty(struct bpf_prog_array *array); 1162 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs, 1163 __u32 __user *prog_ids, u32 cnt); 1164 1165 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs, 1166 struct bpf_prog *old_prog); 1167 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index); 1168 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index, 1169 struct bpf_prog *prog); 1170 int bpf_prog_array_copy_info(struct bpf_prog_array *array, 1171 u32 *prog_ids, u32 request_cnt, 1172 u32 *prog_cnt); 1173 int bpf_prog_array_copy(struct bpf_prog_array *old_array, 1174 struct bpf_prog *exclude_prog, 1175 struct bpf_prog *include_prog, 1176 u64 bpf_cookie, 1177 struct bpf_prog_array **new_array); 1178 1179 struct bpf_run_ctx {}; 1180 1181 struct bpf_cg_run_ctx { 1182 struct bpf_run_ctx run_ctx; 1183 const struct bpf_prog_array_item *prog_item; 1184 }; 1185 1186 struct bpf_trace_run_ctx { 1187 struct bpf_run_ctx run_ctx; 1188 u64 bpf_cookie; 1189 }; 1190 1191 static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx) 1192 { 1193 struct bpf_run_ctx *old_ctx = NULL; 1194 1195 #ifdef CONFIG_BPF_SYSCALL 1196 old_ctx = current->bpf_ctx; 1197 current->bpf_ctx = new_ctx; 1198 #endif 1199 return old_ctx; 1200 } 1201 1202 static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx) 1203 { 1204 #ifdef CONFIG_BPF_SYSCALL 1205 current->bpf_ctx = old_ctx; 1206 #endif 1207 } 1208 1209 /* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */ 1210 #define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE (1 << 0) 1211 /* BPF program asks to set CN on the packet. */ 1212 #define BPF_RET_SET_CN (1 << 0) 1213 1214 typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx); 1215 1216 static __always_inline u32 1217 BPF_PROG_RUN_ARRAY_CG_FLAGS(const struct bpf_prog_array __rcu *array_rcu, 1218 const void *ctx, bpf_prog_run_fn run_prog, 1219 u32 *ret_flags) 1220 { 1221 const struct bpf_prog_array_item *item; 1222 const struct bpf_prog *prog; 1223 const struct bpf_prog_array *array; 1224 struct bpf_run_ctx *old_run_ctx; 1225 struct bpf_cg_run_ctx run_ctx; 1226 u32 ret = 1; 1227 u32 func_ret; 1228 1229 migrate_disable(); 1230 rcu_read_lock(); 1231 array = rcu_dereference(array_rcu); 1232 item = &array->items[0]; 1233 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx); 1234 while ((prog = READ_ONCE(item->prog))) { 1235 run_ctx.prog_item = item; 1236 func_ret = run_prog(prog, ctx); 1237 ret &= (func_ret & 1); 1238 *(ret_flags) |= (func_ret >> 1); 1239 item++; 1240 } 1241 bpf_reset_run_ctx(old_run_ctx); 1242 rcu_read_unlock(); 1243 migrate_enable(); 1244 return ret; 1245 } 1246 1247 static __always_inline u32 1248 BPF_PROG_RUN_ARRAY_CG(const struct bpf_prog_array __rcu *array_rcu, 1249 const void *ctx, bpf_prog_run_fn run_prog) 1250 { 1251 const struct bpf_prog_array_item *item; 1252 const struct bpf_prog *prog; 1253 const struct bpf_prog_array *array; 1254 struct bpf_run_ctx *old_run_ctx; 1255 struct bpf_cg_run_ctx run_ctx; 1256 u32 ret = 1; 1257 1258 migrate_disable(); 1259 rcu_read_lock(); 1260 array = rcu_dereference(array_rcu); 1261 item = &array->items[0]; 1262 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx); 1263 while ((prog = READ_ONCE(item->prog))) { 1264 run_ctx.prog_item = item; 1265 ret &= run_prog(prog, ctx); 1266 item++; 1267 } 1268 bpf_reset_run_ctx(old_run_ctx); 1269 rcu_read_unlock(); 1270 migrate_enable(); 1271 return ret; 1272 } 1273 1274 static __always_inline u32 1275 BPF_PROG_RUN_ARRAY(const struct bpf_prog_array __rcu *array_rcu, 1276 const void *ctx, bpf_prog_run_fn run_prog) 1277 { 1278 const struct bpf_prog_array_item *item; 1279 const struct bpf_prog *prog; 1280 const struct bpf_prog_array *array; 1281 struct bpf_run_ctx *old_run_ctx; 1282 struct bpf_trace_run_ctx run_ctx; 1283 u32 ret = 1; 1284 1285 migrate_disable(); 1286 rcu_read_lock(); 1287 array = rcu_dereference(array_rcu); 1288 if (unlikely(!array)) 1289 goto out; 1290 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx); 1291 item = &array->items[0]; 1292 while ((prog = READ_ONCE(item->prog))) { 1293 run_ctx.bpf_cookie = item->bpf_cookie; 1294 ret &= run_prog(prog, ctx); 1295 item++; 1296 } 1297 bpf_reset_run_ctx(old_run_ctx); 1298 out: 1299 rcu_read_unlock(); 1300 migrate_enable(); 1301 return ret; 1302 } 1303 1304 /* To be used by __cgroup_bpf_run_filter_skb for EGRESS BPF progs 1305 * so BPF programs can request cwr for TCP packets. 1306 * 1307 * Current cgroup skb programs can only return 0 or 1 (0 to drop the 1308 * packet. This macro changes the behavior so the low order bit 1309 * indicates whether the packet should be dropped (0) or not (1) 1310 * and the next bit is a congestion notification bit. This could be 1311 * used by TCP to call tcp_enter_cwr() 1312 * 1313 * Hence, new allowed return values of CGROUP EGRESS BPF programs are: 1314 * 0: drop packet 1315 * 1: keep packet 1316 * 2: drop packet and cn 1317 * 3: keep packet and cn 1318 * 1319 * This macro then converts it to one of the NET_XMIT or an error 1320 * code that is then interpreted as drop packet (and no cn): 1321 * 0: NET_XMIT_SUCCESS skb should be transmitted 1322 * 1: NET_XMIT_DROP skb should be dropped and cn 1323 * 2: NET_XMIT_CN skb should be transmitted and cn 1324 * 3: -EPERM skb should be dropped 1325 */ 1326 #define BPF_PROG_CGROUP_INET_EGRESS_RUN_ARRAY(array, ctx, func) \ 1327 ({ \ 1328 u32 _flags = 0; \ 1329 bool _cn; \ 1330 u32 _ret; \ 1331 _ret = BPF_PROG_RUN_ARRAY_CG_FLAGS(array, ctx, func, &_flags); \ 1332 _cn = _flags & BPF_RET_SET_CN; \ 1333 if (_ret) \ 1334 _ret = (_cn ? NET_XMIT_CN : NET_XMIT_SUCCESS); \ 1335 else \ 1336 _ret = (_cn ? NET_XMIT_DROP : -EPERM); \ 1337 _ret; \ 1338 }) 1339 1340 #ifdef CONFIG_BPF_SYSCALL 1341 DECLARE_PER_CPU(int, bpf_prog_active); 1342 extern struct mutex bpf_stats_enabled_mutex; 1343 1344 /* 1345 * Block execution of BPF programs attached to instrumentation (perf, 1346 * kprobes, tracepoints) to prevent deadlocks on map operations as any of 1347 * these events can happen inside a region which holds a map bucket lock 1348 * and can deadlock on it. 1349 * 1350 * Use the preemption safe inc/dec variants on RT because migrate disable 1351 * is preemptible on RT and preemption in the middle of the RMW operation 1352 * might lead to inconsistent state. Use the raw variants for non RT 1353 * kernels as migrate_disable() maps to preempt_disable() so the slightly 1354 * more expensive save operation can be avoided. 1355 */ 1356 static inline void bpf_disable_instrumentation(void) 1357 { 1358 migrate_disable(); 1359 if (IS_ENABLED(CONFIG_PREEMPT_RT)) 1360 this_cpu_inc(bpf_prog_active); 1361 else 1362 __this_cpu_inc(bpf_prog_active); 1363 } 1364 1365 static inline void bpf_enable_instrumentation(void) 1366 { 1367 if (IS_ENABLED(CONFIG_PREEMPT_RT)) 1368 this_cpu_dec(bpf_prog_active); 1369 else 1370 __this_cpu_dec(bpf_prog_active); 1371 migrate_enable(); 1372 } 1373 1374 extern const struct file_operations bpf_map_fops; 1375 extern const struct file_operations bpf_prog_fops; 1376 extern const struct file_operations bpf_iter_fops; 1377 1378 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \ 1379 extern const struct bpf_prog_ops _name ## _prog_ops; \ 1380 extern const struct bpf_verifier_ops _name ## _verifier_ops; 1381 #define BPF_MAP_TYPE(_id, _ops) \ 1382 extern const struct bpf_map_ops _ops; 1383 #define BPF_LINK_TYPE(_id, _name) 1384 #include <linux/bpf_types.h> 1385 #undef BPF_PROG_TYPE 1386 #undef BPF_MAP_TYPE 1387 #undef BPF_LINK_TYPE 1388 1389 extern const struct bpf_prog_ops bpf_offload_prog_ops; 1390 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops; 1391 extern const struct bpf_verifier_ops xdp_analyzer_ops; 1392 1393 struct bpf_prog *bpf_prog_get(u32 ufd); 1394 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, 1395 bool attach_drv); 1396 void bpf_prog_add(struct bpf_prog *prog, int i); 1397 void bpf_prog_sub(struct bpf_prog *prog, int i); 1398 void bpf_prog_inc(struct bpf_prog *prog); 1399 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog); 1400 void bpf_prog_put(struct bpf_prog *prog); 1401 1402 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock); 1403 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock); 1404 1405 struct bpf_map *bpf_map_get(u32 ufd); 1406 struct bpf_map *bpf_map_get_with_uref(u32 ufd); 1407 struct bpf_map *__bpf_map_get(struct fd f); 1408 void bpf_map_inc(struct bpf_map *map); 1409 void bpf_map_inc_with_uref(struct bpf_map *map); 1410 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map); 1411 void bpf_map_put_with_uref(struct bpf_map *map); 1412 void bpf_map_put(struct bpf_map *map); 1413 void *bpf_map_area_alloc(u64 size, int numa_node); 1414 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node); 1415 void bpf_map_area_free(void *base); 1416 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr); 1417 int generic_map_lookup_batch(struct bpf_map *map, 1418 const union bpf_attr *attr, 1419 union bpf_attr __user *uattr); 1420 int generic_map_update_batch(struct bpf_map *map, 1421 const union bpf_attr *attr, 1422 union bpf_attr __user *uattr); 1423 int generic_map_delete_batch(struct bpf_map *map, 1424 const union bpf_attr *attr, 1425 union bpf_attr __user *uattr); 1426 struct bpf_map *bpf_map_get_curr_or_next(u32 *id); 1427 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id); 1428 1429 #ifdef CONFIG_MEMCG_KMEM 1430 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags, 1431 int node); 1432 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags); 1433 void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, 1434 size_t align, gfp_t flags); 1435 #else 1436 static inline void * 1437 bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags, 1438 int node) 1439 { 1440 return kmalloc_node(size, flags, node); 1441 } 1442 1443 static inline void * 1444 bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags) 1445 { 1446 return kzalloc(size, flags); 1447 } 1448 1449 static inline void __percpu * 1450 bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, size_t align, 1451 gfp_t flags) 1452 { 1453 return __alloc_percpu_gfp(size, align, flags); 1454 } 1455 #endif 1456 1457 extern int sysctl_unprivileged_bpf_disabled; 1458 1459 static inline bool bpf_allow_ptr_leaks(void) 1460 { 1461 return perfmon_capable(); 1462 } 1463 1464 static inline bool bpf_allow_uninit_stack(void) 1465 { 1466 return perfmon_capable(); 1467 } 1468 1469 static inline bool bpf_allow_ptr_to_map_access(void) 1470 { 1471 return perfmon_capable(); 1472 } 1473 1474 static inline bool bpf_bypass_spec_v1(void) 1475 { 1476 return perfmon_capable(); 1477 } 1478 1479 static inline bool bpf_bypass_spec_v4(void) 1480 { 1481 return perfmon_capable(); 1482 } 1483 1484 int bpf_map_new_fd(struct bpf_map *map, int flags); 1485 int bpf_prog_new_fd(struct bpf_prog *prog); 1486 1487 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type, 1488 const struct bpf_link_ops *ops, struct bpf_prog *prog); 1489 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer); 1490 int bpf_link_settle(struct bpf_link_primer *primer); 1491 void bpf_link_cleanup(struct bpf_link_primer *primer); 1492 void bpf_link_inc(struct bpf_link *link); 1493 void bpf_link_put(struct bpf_link *link); 1494 int bpf_link_new_fd(struct bpf_link *link); 1495 struct file *bpf_link_new_file(struct bpf_link *link, int *reserved_fd); 1496 struct bpf_link *bpf_link_get_from_fd(u32 ufd); 1497 1498 int bpf_obj_pin_user(u32 ufd, const char __user *pathname); 1499 int bpf_obj_get_user(const char __user *pathname, int flags); 1500 1501 #define BPF_ITER_FUNC_PREFIX "bpf_iter_" 1502 #define DEFINE_BPF_ITER_FUNC(target, args...) \ 1503 extern int bpf_iter_ ## target(args); \ 1504 int __init bpf_iter_ ## target(args) { return 0; } 1505 1506 struct bpf_iter_aux_info { 1507 struct bpf_map *map; 1508 }; 1509 1510 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog, 1511 union bpf_iter_link_info *linfo, 1512 struct bpf_iter_aux_info *aux); 1513 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux); 1514 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux, 1515 struct seq_file *seq); 1516 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux, 1517 struct bpf_link_info *info); 1518 typedef const struct bpf_func_proto * 1519 (*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id, 1520 const struct bpf_prog *prog); 1521 1522 enum bpf_iter_feature { 1523 BPF_ITER_RESCHED = BIT(0), 1524 }; 1525 1526 #define BPF_ITER_CTX_ARG_MAX 2 1527 struct bpf_iter_reg { 1528 const char *target; 1529 bpf_iter_attach_target_t attach_target; 1530 bpf_iter_detach_target_t detach_target; 1531 bpf_iter_show_fdinfo_t show_fdinfo; 1532 bpf_iter_fill_link_info_t fill_link_info; 1533 bpf_iter_get_func_proto_t get_func_proto; 1534 u32 ctx_arg_info_size; 1535 u32 feature; 1536 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX]; 1537 const struct bpf_iter_seq_info *seq_info; 1538 }; 1539 1540 struct bpf_iter_meta { 1541 __bpf_md_ptr(struct seq_file *, seq); 1542 u64 session_id; 1543 u64 seq_num; 1544 }; 1545 1546 struct bpf_iter__bpf_map_elem { 1547 __bpf_md_ptr(struct bpf_iter_meta *, meta); 1548 __bpf_md_ptr(struct bpf_map *, map); 1549 __bpf_md_ptr(void *, key); 1550 __bpf_md_ptr(void *, value); 1551 }; 1552 1553 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info); 1554 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info); 1555 bool bpf_iter_prog_supported(struct bpf_prog *prog); 1556 const struct bpf_func_proto * 1557 bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog); 1558 int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog); 1559 int bpf_iter_new_fd(struct bpf_link *link); 1560 bool bpf_link_is_iter(struct bpf_link *link); 1561 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop); 1562 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx); 1563 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux, 1564 struct seq_file *seq); 1565 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux, 1566 struct bpf_link_info *info); 1567 1568 int map_set_for_each_callback_args(struct bpf_verifier_env *env, 1569 struct bpf_func_state *caller, 1570 struct bpf_func_state *callee); 1571 1572 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value); 1573 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value); 1574 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value, 1575 u64 flags); 1576 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value, 1577 u64 flags); 1578 1579 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value); 1580 1581 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file, 1582 void *key, void *value, u64 map_flags); 1583 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 1584 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file, 1585 void *key, void *value, u64 map_flags); 1586 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 1587 1588 int bpf_get_file_flag(int flags); 1589 int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size, 1590 size_t actual_size); 1591 1592 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and 1593 * forced to use 'long' read/writes to try to atomically copy long counters. 1594 * Best-effort only. No barriers here, since it _will_ race with concurrent 1595 * updates from BPF programs. Called from bpf syscall and mostly used with 1596 * size 8 or 16 bytes, so ask compiler to inline it. 1597 */ 1598 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size) 1599 { 1600 const long *lsrc = src; 1601 long *ldst = dst; 1602 1603 size /= sizeof(long); 1604 while (size--) 1605 *ldst++ = *lsrc++; 1606 } 1607 1608 /* verify correctness of eBPF program */ 1609 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr); 1610 1611 #ifndef CONFIG_BPF_JIT_ALWAYS_ON 1612 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth); 1613 #endif 1614 1615 struct btf *bpf_get_btf_vmlinux(void); 1616 1617 /* Map specifics */ 1618 struct xdp_buff; 1619 struct sk_buff; 1620 struct bpf_dtab_netdev; 1621 struct bpf_cpu_map_entry; 1622 1623 void __dev_flush(void); 1624 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp, 1625 struct net_device *dev_rx); 1626 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, 1627 struct net_device *dev_rx); 1628 int dev_map_enqueue_multi(struct xdp_buff *xdp, struct net_device *dev_rx, 1629 struct bpf_map *map, bool exclude_ingress); 1630 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb, 1631 struct bpf_prog *xdp_prog); 1632 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb, 1633 struct bpf_prog *xdp_prog, struct bpf_map *map, 1634 bool exclude_ingress); 1635 1636 void __cpu_map_flush(void); 1637 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp, 1638 struct net_device *dev_rx); 1639 int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu, 1640 struct sk_buff *skb); 1641 1642 /* Return map's numa specified by userspace */ 1643 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr) 1644 { 1645 return (attr->map_flags & BPF_F_NUMA_NODE) ? 1646 attr->numa_node : NUMA_NO_NODE; 1647 } 1648 1649 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type); 1650 int array_map_alloc_check(union bpf_attr *attr); 1651 1652 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, 1653 union bpf_attr __user *uattr); 1654 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, 1655 union bpf_attr __user *uattr); 1656 int bpf_prog_test_run_tracing(struct bpf_prog *prog, 1657 const union bpf_attr *kattr, 1658 union bpf_attr __user *uattr); 1659 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, 1660 const union bpf_attr *kattr, 1661 union bpf_attr __user *uattr); 1662 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog, 1663 const union bpf_attr *kattr, 1664 union bpf_attr __user *uattr); 1665 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog, 1666 const union bpf_attr *kattr, 1667 union bpf_attr __user *uattr); 1668 bool bpf_prog_test_check_kfunc_call(u32 kfunc_id, struct module *owner); 1669 bool btf_ctx_access(int off, int size, enum bpf_access_type type, 1670 const struct bpf_prog *prog, 1671 struct bpf_insn_access_aux *info); 1672 1673 static inline bool bpf_tracing_ctx_access(int off, int size, 1674 enum bpf_access_type type) 1675 { 1676 if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS) 1677 return false; 1678 if (type != BPF_READ) 1679 return false; 1680 if (off % size != 0) 1681 return false; 1682 return true; 1683 } 1684 1685 static inline bool bpf_tracing_btf_ctx_access(int off, int size, 1686 enum bpf_access_type type, 1687 const struct bpf_prog *prog, 1688 struct bpf_insn_access_aux *info) 1689 { 1690 if (!bpf_tracing_ctx_access(off, size, type)) 1691 return false; 1692 return btf_ctx_access(off, size, type, prog, info); 1693 } 1694 1695 int btf_struct_access(struct bpf_verifier_log *log, const struct btf *btf, 1696 const struct btf_type *t, int off, int size, 1697 enum bpf_access_type atype, 1698 u32 *next_btf_id); 1699 bool btf_struct_ids_match(struct bpf_verifier_log *log, 1700 const struct btf *btf, u32 id, int off, 1701 const struct btf *need_btf, u32 need_type_id); 1702 1703 int btf_distill_func_proto(struct bpf_verifier_log *log, 1704 struct btf *btf, 1705 const struct btf_type *func_proto, 1706 const char *func_name, 1707 struct btf_func_model *m); 1708 1709 struct bpf_reg_state; 1710 int btf_check_subprog_arg_match(struct bpf_verifier_env *env, int subprog, 1711 struct bpf_reg_state *regs); 1712 int btf_check_kfunc_arg_match(struct bpf_verifier_env *env, 1713 const struct btf *btf, u32 func_id, 1714 struct bpf_reg_state *regs); 1715 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog, 1716 struct bpf_reg_state *reg); 1717 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog, 1718 struct btf *btf, const struct btf_type *t); 1719 1720 struct bpf_prog *bpf_prog_by_id(u32 id); 1721 struct bpf_link *bpf_link_by_id(u32 id); 1722 1723 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id); 1724 void bpf_task_storage_free(struct task_struct *task); 1725 bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog); 1726 const struct btf_func_model * 1727 bpf_jit_find_kfunc_model(const struct bpf_prog *prog, 1728 const struct bpf_insn *insn); 1729 #else /* !CONFIG_BPF_SYSCALL */ 1730 static inline struct bpf_prog *bpf_prog_get(u32 ufd) 1731 { 1732 return ERR_PTR(-EOPNOTSUPP); 1733 } 1734 1735 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, 1736 enum bpf_prog_type type, 1737 bool attach_drv) 1738 { 1739 return ERR_PTR(-EOPNOTSUPP); 1740 } 1741 1742 static inline void bpf_prog_add(struct bpf_prog *prog, int i) 1743 { 1744 } 1745 1746 static inline void bpf_prog_sub(struct bpf_prog *prog, int i) 1747 { 1748 } 1749 1750 static inline void bpf_prog_put(struct bpf_prog *prog) 1751 { 1752 } 1753 1754 static inline void bpf_prog_inc(struct bpf_prog *prog) 1755 { 1756 } 1757 1758 static inline struct bpf_prog *__must_check 1759 bpf_prog_inc_not_zero(struct bpf_prog *prog) 1760 { 1761 return ERR_PTR(-EOPNOTSUPP); 1762 } 1763 1764 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type, 1765 const struct bpf_link_ops *ops, 1766 struct bpf_prog *prog) 1767 { 1768 } 1769 1770 static inline int bpf_link_prime(struct bpf_link *link, 1771 struct bpf_link_primer *primer) 1772 { 1773 return -EOPNOTSUPP; 1774 } 1775 1776 static inline int bpf_link_settle(struct bpf_link_primer *primer) 1777 { 1778 return -EOPNOTSUPP; 1779 } 1780 1781 static inline void bpf_link_cleanup(struct bpf_link_primer *primer) 1782 { 1783 } 1784 1785 static inline void bpf_link_inc(struct bpf_link *link) 1786 { 1787 } 1788 1789 static inline void bpf_link_put(struct bpf_link *link) 1790 { 1791 } 1792 1793 static inline int bpf_obj_get_user(const char __user *pathname, int flags) 1794 { 1795 return -EOPNOTSUPP; 1796 } 1797 1798 static inline bool dev_map_can_have_prog(struct bpf_map *map) 1799 { 1800 return false; 1801 } 1802 1803 static inline void __dev_flush(void) 1804 { 1805 } 1806 1807 struct xdp_buff; 1808 struct bpf_dtab_netdev; 1809 struct bpf_cpu_map_entry; 1810 1811 static inline 1812 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp, 1813 struct net_device *dev_rx) 1814 { 1815 return 0; 1816 } 1817 1818 static inline 1819 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, 1820 struct net_device *dev_rx) 1821 { 1822 return 0; 1823 } 1824 1825 static inline 1826 int dev_map_enqueue_multi(struct xdp_buff *xdp, struct net_device *dev_rx, 1827 struct bpf_map *map, bool exclude_ingress) 1828 { 1829 return 0; 1830 } 1831 1832 struct sk_buff; 1833 1834 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, 1835 struct sk_buff *skb, 1836 struct bpf_prog *xdp_prog) 1837 { 1838 return 0; 1839 } 1840 1841 static inline 1842 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb, 1843 struct bpf_prog *xdp_prog, struct bpf_map *map, 1844 bool exclude_ingress) 1845 { 1846 return 0; 1847 } 1848 1849 static inline void __cpu_map_flush(void) 1850 { 1851 } 1852 1853 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, 1854 struct xdp_buff *xdp, 1855 struct net_device *dev_rx) 1856 { 1857 return 0; 1858 } 1859 1860 static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu, 1861 struct sk_buff *skb) 1862 { 1863 return -EOPNOTSUPP; 1864 } 1865 1866 static inline bool cpu_map_prog_allowed(struct bpf_map *map) 1867 { 1868 return false; 1869 } 1870 1871 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name, 1872 enum bpf_prog_type type) 1873 { 1874 return ERR_PTR(-EOPNOTSUPP); 1875 } 1876 1877 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog, 1878 const union bpf_attr *kattr, 1879 union bpf_attr __user *uattr) 1880 { 1881 return -ENOTSUPP; 1882 } 1883 1884 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog, 1885 const union bpf_attr *kattr, 1886 union bpf_attr __user *uattr) 1887 { 1888 return -ENOTSUPP; 1889 } 1890 1891 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog, 1892 const union bpf_attr *kattr, 1893 union bpf_attr __user *uattr) 1894 { 1895 return -ENOTSUPP; 1896 } 1897 1898 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, 1899 const union bpf_attr *kattr, 1900 union bpf_attr __user *uattr) 1901 { 1902 return -ENOTSUPP; 1903 } 1904 1905 static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog, 1906 const union bpf_attr *kattr, 1907 union bpf_attr __user *uattr) 1908 { 1909 return -ENOTSUPP; 1910 } 1911 1912 static inline bool bpf_prog_test_check_kfunc_call(u32 kfunc_id, 1913 struct module *owner) 1914 { 1915 return false; 1916 } 1917 1918 static inline void bpf_map_put(struct bpf_map *map) 1919 { 1920 } 1921 1922 static inline struct bpf_prog *bpf_prog_by_id(u32 id) 1923 { 1924 return ERR_PTR(-ENOTSUPP); 1925 } 1926 1927 static inline const struct bpf_func_proto * 1928 bpf_base_func_proto(enum bpf_func_id func_id) 1929 { 1930 return NULL; 1931 } 1932 1933 static inline void bpf_task_storage_free(struct task_struct *task) 1934 { 1935 } 1936 1937 static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog) 1938 { 1939 return false; 1940 } 1941 1942 static inline const struct btf_func_model * 1943 bpf_jit_find_kfunc_model(const struct bpf_prog *prog, 1944 const struct bpf_insn *insn) 1945 { 1946 return NULL; 1947 } 1948 #endif /* CONFIG_BPF_SYSCALL */ 1949 1950 void __bpf_free_used_btfs(struct bpf_prog_aux *aux, 1951 struct btf_mod_pair *used_btfs, u32 len); 1952 1953 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd, 1954 enum bpf_prog_type type) 1955 { 1956 return bpf_prog_get_type_dev(ufd, type, false); 1957 } 1958 1959 void __bpf_free_used_maps(struct bpf_prog_aux *aux, 1960 struct bpf_map **used_maps, u32 len); 1961 1962 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool); 1963 1964 int bpf_prog_offload_compile(struct bpf_prog *prog); 1965 void bpf_prog_offload_destroy(struct bpf_prog *prog); 1966 int bpf_prog_offload_info_fill(struct bpf_prog_info *info, 1967 struct bpf_prog *prog); 1968 1969 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map); 1970 1971 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value); 1972 int bpf_map_offload_update_elem(struct bpf_map *map, 1973 void *key, void *value, u64 flags); 1974 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key); 1975 int bpf_map_offload_get_next_key(struct bpf_map *map, 1976 void *key, void *next_key); 1977 1978 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map); 1979 1980 struct bpf_offload_dev * 1981 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv); 1982 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev); 1983 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev); 1984 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev, 1985 struct net_device *netdev); 1986 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev, 1987 struct net_device *netdev); 1988 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev); 1989 1990 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL) 1991 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr); 1992 1993 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux) 1994 { 1995 return aux->offload_requested; 1996 } 1997 1998 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 1999 { 2000 return unlikely(map->ops == &bpf_map_offload_ops); 2001 } 2002 2003 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr); 2004 void bpf_map_offload_map_free(struct bpf_map *map); 2005 int bpf_prog_test_run_syscall(struct bpf_prog *prog, 2006 const union bpf_attr *kattr, 2007 union bpf_attr __user *uattr); 2008 2009 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog); 2010 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype); 2011 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags); 2012 void sock_map_unhash(struct sock *sk); 2013 void sock_map_close(struct sock *sk, long timeout); 2014 #else 2015 static inline int bpf_prog_offload_init(struct bpf_prog *prog, 2016 union bpf_attr *attr) 2017 { 2018 return -EOPNOTSUPP; 2019 } 2020 2021 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux) 2022 { 2023 return false; 2024 } 2025 2026 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 2027 { 2028 return false; 2029 } 2030 2031 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr) 2032 { 2033 return ERR_PTR(-EOPNOTSUPP); 2034 } 2035 2036 static inline void bpf_map_offload_map_free(struct bpf_map *map) 2037 { 2038 } 2039 2040 static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog, 2041 const union bpf_attr *kattr, 2042 union bpf_attr __user *uattr) 2043 { 2044 return -ENOTSUPP; 2045 } 2046 2047 #ifdef CONFIG_BPF_SYSCALL 2048 static inline int sock_map_get_from_fd(const union bpf_attr *attr, 2049 struct bpf_prog *prog) 2050 { 2051 return -EINVAL; 2052 } 2053 2054 static inline int sock_map_prog_detach(const union bpf_attr *attr, 2055 enum bpf_prog_type ptype) 2056 { 2057 return -EOPNOTSUPP; 2058 } 2059 2060 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, 2061 u64 flags) 2062 { 2063 return -EOPNOTSUPP; 2064 } 2065 #endif /* CONFIG_BPF_SYSCALL */ 2066 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */ 2067 2068 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) 2069 void bpf_sk_reuseport_detach(struct sock *sk); 2070 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key, 2071 void *value); 2072 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key, 2073 void *value, u64 map_flags); 2074 #else 2075 static inline void bpf_sk_reuseport_detach(struct sock *sk) 2076 { 2077 } 2078 2079 #ifdef CONFIG_BPF_SYSCALL 2080 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, 2081 void *key, void *value) 2082 { 2083 return -EOPNOTSUPP; 2084 } 2085 2086 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, 2087 void *key, void *value, 2088 u64 map_flags) 2089 { 2090 return -EOPNOTSUPP; 2091 } 2092 #endif /* CONFIG_BPF_SYSCALL */ 2093 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */ 2094 2095 /* verifier prototypes for helper functions called from eBPF programs */ 2096 extern const struct bpf_func_proto bpf_map_lookup_elem_proto; 2097 extern const struct bpf_func_proto bpf_map_update_elem_proto; 2098 extern const struct bpf_func_proto bpf_map_delete_elem_proto; 2099 extern const struct bpf_func_proto bpf_map_push_elem_proto; 2100 extern const struct bpf_func_proto bpf_map_pop_elem_proto; 2101 extern const struct bpf_func_proto bpf_map_peek_elem_proto; 2102 2103 extern const struct bpf_func_proto bpf_get_prandom_u32_proto; 2104 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto; 2105 extern const struct bpf_func_proto bpf_get_numa_node_id_proto; 2106 extern const struct bpf_func_proto bpf_tail_call_proto; 2107 extern const struct bpf_func_proto bpf_ktime_get_ns_proto; 2108 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto; 2109 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto; 2110 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto; 2111 extern const struct bpf_func_proto bpf_get_current_comm_proto; 2112 extern const struct bpf_func_proto bpf_get_stackid_proto; 2113 extern const struct bpf_func_proto bpf_get_stack_proto; 2114 extern const struct bpf_func_proto bpf_get_task_stack_proto; 2115 extern const struct bpf_func_proto bpf_get_stackid_proto_pe; 2116 extern const struct bpf_func_proto bpf_get_stack_proto_pe; 2117 extern const struct bpf_func_proto bpf_sock_map_update_proto; 2118 extern const struct bpf_func_proto bpf_sock_hash_update_proto; 2119 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto; 2120 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto; 2121 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto; 2122 extern const struct bpf_func_proto bpf_msg_redirect_map_proto; 2123 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto; 2124 extern const struct bpf_func_proto bpf_sk_redirect_map_proto; 2125 extern const struct bpf_func_proto bpf_spin_lock_proto; 2126 extern const struct bpf_func_proto bpf_spin_unlock_proto; 2127 extern const struct bpf_func_proto bpf_get_local_storage_proto; 2128 extern const struct bpf_func_proto bpf_strtol_proto; 2129 extern const struct bpf_func_proto bpf_strtoul_proto; 2130 extern const struct bpf_func_proto bpf_tcp_sock_proto; 2131 extern const struct bpf_func_proto bpf_jiffies64_proto; 2132 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto; 2133 extern const struct bpf_func_proto bpf_event_output_data_proto; 2134 extern const struct bpf_func_proto bpf_ringbuf_output_proto; 2135 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto; 2136 extern const struct bpf_func_proto bpf_ringbuf_submit_proto; 2137 extern const struct bpf_func_proto bpf_ringbuf_discard_proto; 2138 extern const struct bpf_func_proto bpf_ringbuf_query_proto; 2139 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto; 2140 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto; 2141 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto; 2142 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto; 2143 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto; 2144 extern const struct bpf_func_proto bpf_skc_to_unix_sock_proto; 2145 extern const struct bpf_func_proto bpf_copy_from_user_proto; 2146 extern const struct bpf_func_proto bpf_snprintf_btf_proto; 2147 extern const struct bpf_func_proto bpf_snprintf_proto; 2148 extern const struct bpf_func_proto bpf_per_cpu_ptr_proto; 2149 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto; 2150 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto; 2151 extern const struct bpf_func_proto bpf_sock_from_file_proto; 2152 extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto; 2153 extern const struct bpf_func_proto bpf_task_storage_get_proto; 2154 extern const struct bpf_func_proto bpf_task_storage_delete_proto; 2155 extern const struct bpf_func_proto bpf_for_each_map_elem_proto; 2156 extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto; 2157 extern const struct bpf_func_proto bpf_sk_setsockopt_proto; 2158 extern const struct bpf_func_proto bpf_sk_getsockopt_proto; 2159 extern const struct bpf_func_proto bpf_kallsyms_lookup_name_proto; 2160 2161 const struct bpf_func_proto *tracing_prog_func_proto( 2162 enum bpf_func_id func_id, const struct bpf_prog *prog); 2163 2164 /* Shared helpers among cBPF and eBPF. */ 2165 void bpf_user_rnd_init_once(void); 2166 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 2167 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 2168 2169 #if defined(CONFIG_NET) 2170 bool bpf_sock_common_is_valid_access(int off, int size, 2171 enum bpf_access_type type, 2172 struct bpf_insn_access_aux *info); 2173 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type, 2174 struct bpf_insn_access_aux *info); 2175 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 2176 const struct bpf_insn *si, 2177 struct bpf_insn *insn_buf, 2178 struct bpf_prog *prog, 2179 u32 *target_size); 2180 #else 2181 static inline bool bpf_sock_common_is_valid_access(int off, int size, 2182 enum bpf_access_type type, 2183 struct bpf_insn_access_aux *info) 2184 { 2185 return false; 2186 } 2187 static inline bool bpf_sock_is_valid_access(int off, int size, 2188 enum bpf_access_type type, 2189 struct bpf_insn_access_aux *info) 2190 { 2191 return false; 2192 } 2193 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 2194 const struct bpf_insn *si, 2195 struct bpf_insn *insn_buf, 2196 struct bpf_prog *prog, 2197 u32 *target_size) 2198 { 2199 return 0; 2200 } 2201 #endif 2202 2203 #ifdef CONFIG_INET 2204 struct sk_reuseport_kern { 2205 struct sk_buff *skb; 2206 struct sock *sk; 2207 struct sock *selected_sk; 2208 struct sock *migrating_sk; 2209 void *data_end; 2210 u32 hash; 2211 u32 reuseport_id; 2212 bool bind_inany; 2213 }; 2214 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 2215 struct bpf_insn_access_aux *info); 2216 2217 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, 2218 const struct bpf_insn *si, 2219 struct bpf_insn *insn_buf, 2220 struct bpf_prog *prog, 2221 u32 *target_size); 2222 2223 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 2224 struct bpf_insn_access_aux *info); 2225 2226 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, 2227 const struct bpf_insn *si, 2228 struct bpf_insn *insn_buf, 2229 struct bpf_prog *prog, 2230 u32 *target_size); 2231 #else 2232 static inline bool bpf_tcp_sock_is_valid_access(int off, int size, 2233 enum bpf_access_type type, 2234 struct bpf_insn_access_aux *info) 2235 { 2236 return false; 2237 } 2238 2239 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, 2240 const struct bpf_insn *si, 2241 struct bpf_insn *insn_buf, 2242 struct bpf_prog *prog, 2243 u32 *target_size) 2244 { 2245 return 0; 2246 } 2247 static inline bool bpf_xdp_sock_is_valid_access(int off, int size, 2248 enum bpf_access_type type, 2249 struct bpf_insn_access_aux *info) 2250 { 2251 return false; 2252 } 2253 2254 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, 2255 const struct bpf_insn *si, 2256 struct bpf_insn *insn_buf, 2257 struct bpf_prog *prog, 2258 u32 *target_size) 2259 { 2260 return 0; 2261 } 2262 #endif /* CONFIG_INET */ 2263 2264 enum bpf_text_poke_type { 2265 BPF_MOD_CALL, 2266 BPF_MOD_JUMP, 2267 }; 2268 2269 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t, 2270 void *addr1, void *addr2); 2271 2272 struct btf_id_set; 2273 bool btf_id_set_contains(const struct btf_id_set *set, u32 id); 2274 2275 #define MAX_BPRINTF_VARARGS 12 2276 2277 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args, 2278 u32 **bin_buf, u32 num_args); 2279 void bpf_bprintf_cleanup(void); 2280 2281 #endif /* _LINUX_BPF_H */ 2282