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/u64_stats_sync.h> 18 #include <linux/refcount.h> 19 #include <linux/mutex.h> 20 #include <linux/module.h> 21 22 struct bpf_verifier_env; 23 struct bpf_verifier_log; 24 struct perf_event; 25 struct bpf_prog; 26 struct bpf_prog_aux; 27 struct bpf_map; 28 struct sock; 29 struct seq_file; 30 struct btf; 31 struct btf_type; 32 struct exception_table_entry; 33 34 extern struct idr btf_idr; 35 extern spinlock_t btf_idr_lock; 36 37 /* map is generic key/value storage optionally accesible by eBPF programs */ 38 struct bpf_map_ops { 39 /* funcs callable from userspace (via syscall) */ 40 int (*map_alloc_check)(union bpf_attr *attr); 41 struct bpf_map *(*map_alloc)(union bpf_attr *attr); 42 void (*map_release)(struct bpf_map *map, struct file *map_file); 43 void (*map_free)(struct bpf_map *map); 44 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key); 45 void (*map_release_uref)(struct bpf_map *map); 46 void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key); 47 int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr, 48 union bpf_attr __user *uattr); 49 int (*map_lookup_and_delete_batch)(struct bpf_map *map, 50 const union bpf_attr *attr, 51 union bpf_attr __user *uattr); 52 int (*map_update_batch)(struct bpf_map *map, const union bpf_attr *attr, 53 union bpf_attr __user *uattr); 54 int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr, 55 union bpf_attr __user *uattr); 56 57 /* funcs callable from userspace and from eBPF programs */ 58 void *(*map_lookup_elem)(struct bpf_map *map, void *key); 59 int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags); 60 int (*map_delete_elem)(struct bpf_map *map, void *key); 61 int (*map_push_elem)(struct bpf_map *map, void *value, u64 flags); 62 int (*map_pop_elem)(struct bpf_map *map, void *value); 63 int (*map_peek_elem)(struct bpf_map *map, void *value); 64 65 /* funcs called by prog_array and perf_event_array map */ 66 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file, 67 int fd); 68 void (*map_fd_put_ptr)(void *ptr); 69 u32 (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf); 70 u32 (*map_fd_sys_lookup_elem)(void *ptr); 71 void (*map_seq_show_elem)(struct bpf_map *map, void *key, 72 struct seq_file *m); 73 int (*map_check_btf)(const struct bpf_map *map, 74 const struct btf *btf, 75 const struct btf_type *key_type, 76 const struct btf_type *value_type); 77 78 /* Prog poke tracking helpers. */ 79 int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux); 80 void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux); 81 void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old, 82 struct bpf_prog *new); 83 84 /* Direct value access helpers. */ 85 int (*map_direct_value_addr)(const struct bpf_map *map, 86 u64 *imm, u32 off); 87 int (*map_direct_value_meta)(const struct bpf_map *map, 88 u64 imm, u32 *off); 89 int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma); 90 }; 91 92 struct bpf_map_memory { 93 u32 pages; 94 struct user_struct *user; 95 }; 96 97 struct bpf_map { 98 /* The first two cachelines with read-mostly members of which some 99 * are also accessed in fast-path (e.g. ops, max_entries). 100 */ 101 const struct bpf_map_ops *ops ____cacheline_aligned; 102 struct bpf_map *inner_map_meta; 103 #ifdef CONFIG_SECURITY 104 void *security; 105 #endif 106 enum bpf_map_type map_type; 107 u32 key_size; 108 u32 value_size; 109 u32 max_entries; 110 u32 map_flags; 111 int spin_lock_off; /* >=0 valid offset, <0 error */ 112 u32 id; 113 int numa_node; 114 u32 btf_key_type_id; 115 u32 btf_value_type_id; 116 struct btf *btf; 117 struct bpf_map_memory memory; 118 char name[BPF_OBJ_NAME_LEN]; 119 u32 btf_vmlinux_value_type_id; 120 bool unpriv_array; 121 bool frozen; /* write-once; write-protected by freeze_mutex */ 122 /* 22 bytes hole */ 123 124 /* The 3rd and 4th cacheline with misc members to avoid false sharing 125 * particularly with refcounting. 126 */ 127 atomic64_t refcnt ____cacheline_aligned; 128 atomic64_t usercnt; 129 struct work_struct work; 130 struct mutex freeze_mutex; 131 u64 writecnt; /* writable mmap cnt; protected by freeze_mutex */ 132 }; 133 134 static inline bool map_value_has_spin_lock(const struct bpf_map *map) 135 { 136 return map->spin_lock_off >= 0; 137 } 138 139 static inline void check_and_init_map_lock(struct bpf_map *map, void *dst) 140 { 141 if (likely(!map_value_has_spin_lock(map))) 142 return; 143 *(struct bpf_spin_lock *)(dst + map->spin_lock_off) = 144 (struct bpf_spin_lock){}; 145 } 146 147 /* copy everything but bpf_spin_lock */ 148 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src) 149 { 150 if (unlikely(map_value_has_spin_lock(map))) { 151 u32 off = map->spin_lock_off; 152 153 memcpy(dst, src, off); 154 memcpy(dst + off + sizeof(struct bpf_spin_lock), 155 src + off + sizeof(struct bpf_spin_lock), 156 map->value_size - off - sizeof(struct bpf_spin_lock)); 157 } else { 158 memcpy(dst, src, map->value_size); 159 } 160 } 161 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src, 162 bool lock_src); 163 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size); 164 165 struct bpf_offload_dev; 166 struct bpf_offloaded_map; 167 168 struct bpf_map_dev_ops { 169 int (*map_get_next_key)(struct bpf_offloaded_map *map, 170 void *key, void *next_key); 171 int (*map_lookup_elem)(struct bpf_offloaded_map *map, 172 void *key, void *value); 173 int (*map_update_elem)(struct bpf_offloaded_map *map, 174 void *key, void *value, u64 flags); 175 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key); 176 }; 177 178 struct bpf_offloaded_map { 179 struct bpf_map map; 180 struct net_device *netdev; 181 const struct bpf_map_dev_ops *dev_ops; 182 void *dev_priv; 183 struct list_head offloads; 184 }; 185 186 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map) 187 { 188 return container_of(map, struct bpf_offloaded_map, map); 189 } 190 191 static inline bool bpf_map_offload_neutral(const struct bpf_map *map) 192 { 193 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY; 194 } 195 196 static inline bool bpf_map_support_seq_show(const struct bpf_map *map) 197 { 198 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) && 199 map->ops->map_seq_show_elem; 200 } 201 202 int map_check_no_btf(const struct bpf_map *map, 203 const struct btf *btf, 204 const struct btf_type *key_type, 205 const struct btf_type *value_type); 206 207 extern const struct bpf_map_ops bpf_map_offload_ops; 208 209 /* function argument constraints */ 210 enum bpf_arg_type { 211 ARG_DONTCARE = 0, /* unused argument in helper function */ 212 213 /* the following constraints used to prototype 214 * bpf_map_lookup/update/delete_elem() functions 215 */ 216 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */ 217 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */ 218 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */ 219 ARG_PTR_TO_UNINIT_MAP_VALUE, /* pointer to valid memory used to store a map value */ 220 ARG_PTR_TO_MAP_VALUE_OR_NULL, /* pointer to stack used as map value or NULL */ 221 222 /* the following constraints used to prototype bpf_memcmp() and other 223 * functions that access data on eBPF program stack 224 */ 225 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */ 226 ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */ 227 ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized, 228 * helper function must fill all bytes or clear 229 * them in error case. 230 */ 231 232 ARG_CONST_SIZE, /* number of bytes accessed from memory */ 233 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */ 234 235 ARG_PTR_TO_CTX, /* pointer to context */ 236 ARG_ANYTHING, /* any (initialized) argument is ok */ 237 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */ 238 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */ 239 ARG_PTR_TO_INT, /* pointer to int */ 240 ARG_PTR_TO_LONG, /* pointer to long */ 241 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */ 242 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */ 243 }; 244 245 /* type of values returned from helper functions */ 246 enum bpf_return_type { 247 RET_INTEGER, /* function returns integer */ 248 RET_VOID, /* function doesn't return anything */ 249 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */ 250 RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */ 251 RET_PTR_TO_SOCKET_OR_NULL, /* returns a pointer to a socket or NULL */ 252 RET_PTR_TO_TCP_SOCK_OR_NULL, /* returns a pointer to a tcp_sock or NULL */ 253 RET_PTR_TO_SOCK_COMMON_OR_NULL, /* returns a pointer to a sock_common or NULL */ 254 }; 255 256 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs 257 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL 258 * instructions after verifying 259 */ 260 struct bpf_func_proto { 261 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 262 bool gpl_only; 263 bool pkt_access; 264 enum bpf_return_type ret_type; 265 union { 266 struct { 267 enum bpf_arg_type arg1_type; 268 enum bpf_arg_type arg2_type; 269 enum bpf_arg_type arg3_type; 270 enum bpf_arg_type arg4_type; 271 enum bpf_arg_type arg5_type; 272 }; 273 enum bpf_arg_type arg_type[5]; 274 }; 275 int *btf_id; /* BTF ids of arguments */ 276 }; 277 278 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is 279 * the first argument to eBPF programs. 280 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *' 281 */ 282 struct bpf_context; 283 284 enum bpf_access_type { 285 BPF_READ = 1, 286 BPF_WRITE = 2 287 }; 288 289 /* types of values stored in eBPF registers */ 290 /* Pointer types represent: 291 * pointer 292 * pointer + imm 293 * pointer + (u16) var 294 * pointer + (u16) var + imm 295 * if (range > 0) then [ptr, ptr + range - off) is safe to access 296 * if (id > 0) means that some 'var' was added 297 * if (off > 0) means that 'imm' was added 298 */ 299 enum bpf_reg_type { 300 NOT_INIT = 0, /* nothing was written into register */ 301 SCALAR_VALUE, /* reg doesn't contain a valid pointer */ 302 PTR_TO_CTX, /* reg points to bpf_context */ 303 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */ 304 PTR_TO_MAP_VALUE, /* reg points to map element value */ 305 PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */ 306 PTR_TO_STACK, /* reg == frame_pointer + offset */ 307 PTR_TO_PACKET_META, /* skb->data - meta_len */ 308 PTR_TO_PACKET, /* reg points to skb->data */ 309 PTR_TO_PACKET_END, /* skb->data + headlen */ 310 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */ 311 PTR_TO_SOCKET, /* reg points to struct bpf_sock */ 312 PTR_TO_SOCKET_OR_NULL, /* reg points to struct bpf_sock or NULL */ 313 PTR_TO_SOCK_COMMON, /* reg points to sock_common */ 314 PTR_TO_SOCK_COMMON_OR_NULL, /* reg points to sock_common or NULL */ 315 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */ 316 PTR_TO_TCP_SOCK_OR_NULL, /* reg points to struct tcp_sock or NULL */ 317 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */ 318 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */ 319 PTR_TO_BTF_ID, /* reg points to kernel struct */ 320 }; 321 322 /* The information passed from prog-specific *_is_valid_access 323 * back to the verifier. 324 */ 325 struct bpf_insn_access_aux { 326 enum bpf_reg_type reg_type; 327 union { 328 int ctx_field_size; 329 u32 btf_id; 330 }; 331 struct bpf_verifier_log *log; /* for verbose logs */ 332 }; 333 334 static inline void 335 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size) 336 { 337 aux->ctx_field_size = size; 338 } 339 340 struct bpf_prog_ops { 341 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr, 342 union bpf_attr __user *uattr); 343 }; 344 345 struct bpf_verifier_ops { 346 /* return eBPF function prototype for verification */ 347 const struct bpf_func_proto * 348 (*get_func_proto)(enum bpf_func_id func_id, 349 const struct bpf_prog *prog); 350 351 /* return true if 'size' wide access at offset 'off' within bpf_context 352 * with 'type' (read or write) is allowed 353 */ 354 bool (*is_valid_access)(int off, int size, enum bpf_access_type type, 355 const struct bpf_prog *prog, 356 struct bpf_insn_access_aux *info); 357 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write, 358 const struct bpf_prog *prog); 359 int (*gen_ld_abs)(const struct bpf_insn *orig, 360 struct bpf_insn *insn_buf); 361 u32 (*convert_ctx_access)(enum bpf_access_type type, 362 const struct bpf_insn *src, 363 struct bpf_insn *dst, 364 struct bpf_prog *prog, u32 *target_size); 365 int (*btf_struct_access)(struct bpf_verifier_log *log, 366 const struct btf_type *t, int off, int size, 367 enum bpf_access_type atype, 368 u32 *next_btf_id); 369 }; 370 371 struct bpf_prog_offload_ops { 372 /* verifier basic callbacks */ 373 int (*insn_hook)(struct bpf_verifier_env *env, 374 int insn_idx, int prev_insn_idx); 375 int (*finalize)(struct bpf_verifier_env *env); 376 /* verifier optimization callbacks (called after .finalize) */ 377 int (*replace_insn)(struct bpf_verifier_env *env, u32 off, 378 struct bpf_insn *insn); 379 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt); 380 /* program management callbacks */ 381 int (*prepare)(struct bpf_prog *prog); 382 int (*translate)(struct bpf_prog *prog); 383 void (*destroy)(struct bpf_prog *prog); 384 }; 385 386 struct bpf_prog_offload { 387 struct bpf_prog *prog; 388 struct net_device *netdev; 389 struct bpf_offload_dev *offdev; 390 void *dev_priv; 391 struct list_head offloads; 392 bool dev_state; 393 bool opt_failed; 394 void *jited_image; 395 u32 jited_len; 396 }; 397 398 enum bpf_cgroup_storage_type { 399 BPF_CGROUP_STORAGE_SHARED, 400 BPF_CGROUP_STORAGE_PERCPU, 401 __BPF_CGROUP_STORAGE_MAX 402 }; 403 404 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX 405 406 /* The longest tracepoint has 12 args. 407 * See include/trace/bpf_probe.h 408 */ 409 #define MAX_BPF_FUNC_ARGS 12 410 411 struct bpf_prog_stats { 412 u64 cnt; 413 u64 nsecs; 414 struct u64_stats_sync syncp; 415 } __aligned(2 * sizeof(u64)); 416 417 struct btf_func_model { 418 u8 ret_size; 419 u8 nr_args; 420 u8 arg_size[MAX_BPF_FUNC_ARGS]; 421 }; 422 423 /* Restore arguments before returning from trampoline to let original function 424 * continue executing. This flag is used for fentry progs when there are no 425 * fexit progs. 426 */ 427 #define BPF_TRAMP_F_RESTORE_REGS BIT(0) 428 /* Call original function after fentry progs, but before fexit progs. 429 * Makes sense for fentry/fexit, normal calls and indirect calls. 430 */ 431 #define BPF_TRAMP_F_CALL_ORIG BIT(1) 432 /* Skip current frame and return to parent. Makes sense for fentry/fexit 433 * programs only. Should not be used with normal calls and indirect calls. 434 */ 435 #define BPF_TRAMP_F_SKIP_FRAME BIT(2) 436 437 /* Different use cases for BPF trampoline: 438 * 1. replace nop at the function entry (kprobe equivalent) 439 * flags = BPF_TRAMP_F_RESTORE_REGS 440 * fentry = a set of programs to run before returning from trampoline 441 * 442 * 2. replace nop at the function entry (kprobe + kretprobe equivalent) 443 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME 444 * orig_call = fentry_ip + MCOUNT_INSN_SIZE 445 * fentry = a set of program to run before calling original function 446 * fexit = a set of program to run after original function 447 * 448 * 3. replace direct call instruction anywhere in the function body 449 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid) 450 * With flags = 0 451 * fentry = a set of programs to run before returning from trampoline 452 * With flags = BPF_TRAMP_F_CALL_ORIG 453 * orig_call = original callback addr or direct function addr 454 * fentry = a set of program to run before calling original function 455 * fexit = a set of program to run after original function 456 */ 457 int arch_prepare_bpf_trampoline(void *image, void *image_end, 458 const struct btf_func_model *m, u32 flags, 459 struct bpf_prog **fentry_progs, int fentry_cnt, 460 struct bpf_prog **fexit_progs, int fexit_cnt, 461 void *orig_call); 462 /* these two functions are called from generated trampoline */ 463 u64 notrace __bpf_prog_enter(void); 464 void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start); 465 466 enum bpf_tramp_prog_type { 467 BPF_TRAMP_FENTRY, 468 BPF_TRAMP_FEXIT, 469 BPF_TRAMP_MAX, 470 BPF_TRAMP_REPLACE, /* more than MAX */ 471 }; 472 473 struct bpf_trampoline { 474 /* hlist for trampoline_table */ 475 struct hlist_node hlist; 476 /* serializes access to fields of this trampoline */ 477 struct mutex mutex; 478 refcount_t refcnt; 479 u64 key; 480 struct { 481 struct btf_func_model model; 482 void *addr; 483 bool ftrace_managed; 484 } func; 485 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF 486 * program by replacing one of its functions. func.addr is the address 487 * of the function it replaced. 488 */ 489 struct bpf_prog *extension_prog; 490 /* list of BPF programs using this trampoline */ 491 struct hlist_head progs_hlist[BPF_TRAMP_MAX]; 492 /* Number of attached programs. A counter per kind. */ 493 int progs_cnt[BPF_TRAMP_MAX]; 494 /* Executable image of trampoline */ 495 void *image; 496 u64 selector; 497 }; 498 499 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */ 500 501 struct bpf_dispatcher_prog { 502 struct bpf_prog *prog; 503 refcount_t users; 504 }; 505 506 struct bpf_dispatcher { 507 /* dispatcher mutex */ 508 struct mutex mutex; 509 void *func; 510 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX]; 511 int num_progs; 512 void *image; 513 u32 image_off; 514 }; 515 516 static __always_inline unsigned int bpf_dispatcher_nopfunc( 517 const void *ctx, 518 const struct bpf_insn *insnsi, 519 unsigned int (*bpf_func)(const void *, 520 const struct bpf_insn *)) 521 { 522 return bpf_func(ctx, insnsi); 523 } 524 #ifdef CONFIG_BPF_JIT 525 struct bpf_trampoline *bpf_trampoline_lookup(u64 key); 526 int bpf_trampoline_link_prog(struct bpf_prog *prog); 527 int bpf_trampoline_unlink_prog(struct bpf_prog *prog); 528 void bpf_trampoline_put(struct bpf_trampoline *tr); 529 #define BPF_DISPATCHER_INIT(name) { \ 530 .mutex = __MUTEX_INITIALIZER(name.mutex), \ 531 .func = &name##func, \ 532 .progs = {}, \ 533 .num_progs = 0, \ 534 .image = NULL, \ 535 .image_off = 0 \ 536 } 537 538 #define DEFINE_BPF_DISPATCHER(name) \ 539 noinline unsigned int name##func( \ 540 const void *ctx, \ 541 const struct bpf_insn *insnsi, \ 542 unsigned int (*bpf_func)(const void *, \ 543 const struct bpf_insn *)) \ 544 { \ 545 return bpf_func(ctx, insnsi); \ 546 } \ 547 EXPORT_SYMBOL(name##func); \ 548 struct bpf_dispatcher name = BPF_DISPATCHER_INIT(name); 549 #define DECLARE_BPF_DISPATCHER(name) \ 550 unsigned int name##func( \ 551 const void *ctx, \ 552 const struct bpf_insn *insnsi, \ 553 unsigned int (*bpf_func)(const void *, \ 554 const struct bpf_insn *)); \ 555 extern struct bpf_dispatcher name; 556 #define BPF_DISPATCHER_FUNC(name) name##func 557 #define BPF_DISPATCHER_PTR(name) (&name) 558 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from, 559 struct bpf_prog *to); 560 struct bpf_image { 561 struct latch_tree_node tnode; 562 unsigned char data[]; 563 }; 564 #define BPF_IMAGE_SIZE (PAGE_SIZE - sizeof(struct bpf_image)) 565 bool is_bpf_image_address(unsigned long address); 566 void *bpf_image_alloc(void); 567 #else 568 static inline struct bpf_trampoline *bpf_trampoline_lookup(u64 key) 569 { 570 return NULL; 571 } 572 static inline int bpf_trampoline_link_prog(struct bpf_prog *prog) 573 { 574 return -ENOTSUPP; 575 } 576 static inline int bpf_trampoline_unlink_prog(struct bpf_prog *prog) 577 { 578 return -ENOTSUPP; 579 } 580 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {} 581 #define DEFINE_BPF_DISPATCHER(name) 582 #define DECLARE_BPF_DISPATCHER(name) 583 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nopfunc 584 #define BPF_DISPATCHER_PTR(name) NULL 585 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, 586 struct bpf_prog *from, 587 struct bpf_prog *to) {} 588 static inline bool is_bpf_image_address(unsigned long address) 589 { 590 return false; 591 } 592 #endif 593 594 struct bpf_func_info_aux { 595 u16 linkage; 596 bool unreliable; 597 }; 598 599 enum bpf_jit_poke_reason { 600 BPF_POKE_REASON_TAIL_CALL, 601 }; 602 603 /* Descriptor of pokes pointing /into/ the JITed image. */ 604 struct bpf_jit_poke_descriptor { 605 void *ip; 606 union { 607 struct { 608 struct bpf_map *map; 609 u32 key; 610 } tail_call; 611 }; 612 bool ip_stable; 613 u8 adj_off; 614 u16 reason; 615 }; 616 617 struct bpf_prog_aux { 618 atomic64_t refcnt; 619 u32 used_map_cnt; 620 u32 max_ctx_offset; 621 u32 max_pkt_offset; 622 u32 max_tp_access; 623 u32 stack_depth; 624 u32 id; 625 u32 func_cnt; /* used by non-func prog as the number of func progs */ 626 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */ 627 u32 attach_btf_id; /* in-kernel BTF type id to attach to */ 628 struct bpf_prog *linked_prog; 629 bool verifier_zext; /* Zero extensions has been inserted by verifier. */ 630 bool offload_requested; 631 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */ 632 bool func_proto_unreliable; 633 enum bpf_tramp_prog_type trampoline_prog_type; 634 struct bpf_trampoline *trampoline; 635 struct hlist_node tramp_hlist; 636 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */ 637 const struct btf_type *attach_func_proto; 638 /* function name for valid attach_btf_id */ 639 const char *attach_func_name; 640 struct bpf_prog **func; 641 void *jit_data; /* JIT specific data. arch dependent */ 642 struct bpf_jit_poke_descriptor *poke_tab; 643 u32 size_poke_tab; 644 struct latch_tree_node ksym_tnode; 645 struct list_head ksym_lnode; 646 const struct bpf_prog_ops *ops; 647 struct bpf_map **used_maps; 648 struct bpf_prog *prog; 649 struct user_struct *user; 650 u64 load_time; /* ns since boottime */ 651 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]; 652 char name[BPF_OBJ_NAME_LEN]; 653 #ifdef CONFIG_SECURITY 654 void *security; 655 #endif 656 struct bpf_prog_offload *offload; 657 struct btf *btf; 658 struct bpf_func_info *func_info; 659 struct bpf_func_info_aux *func_info_aux; 660 /* bpf_line_info loaded from userspace. linfo->insn_off 661 * has the xlated insn offset. 662 * Both the main and sub prog share the same linfo. 663 * The subprog can access its first linfo by 664 * using the linfo_idx. 665 */ 666 struct bpf_line_info *linfo; 667 /* jited_linfo is the jited addr of the linfo. It has a 668 * one to one mapping to linfo: 669 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off. 670 * Both the main and sub prog share the same jited_linfo. 671 * The subprog can access its first jited_linfo by 672 * using the linfo_idx. 673 */ 674 void **jited_linfo; 675 u32 func_info_cnt; 676 u32 nr_linfo; 677 /* subprog can use linfo_idx to access its first linfo and 678 * jited_linfo. 679 * main prog always has linfo_idx == 0 680 */ 681 u32 linfo_idx; 682 u32 num_exentries; 683 struct exception_table_entry *extable; 684 struct bpf_prog_stats __percpu *stats; 685 union { 686 struct work_struct work; 687 struct rcu_head rcu; 688 }; 689 }; 690 691 struct bpf_array_aux { 692 /* 'Ownership' of prog array is claimed by the first program that 693 * is going to use this map or by the first program which FD is 694 * stored in the map to make sure that all callers and callees have 695 * the same prog type and JITed flag. 696 */ 697 enum bpf_prog_type type; 698 bool jited; 699 /* Programs with direct jumps into programs part of this array. */ 700 struct list_head poke_progs; 701 struct bpf_map *map; 702 struct mutex poke_mutex; 703 struct work_struct work; 704 }; 705 706 struct bpf_struct_ops_value; 707 struct btf_type; 708 struct btf_member; 709 710 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64 711 struct bpf_struct_ops { 712 const struct bpf_verifier_ops *verifier_ops; 713 int (*init)(struct btf *btf); 714 int (*check_member)(const struct btf_type *t, 715 const struct btf_member *member); 716 int (*init_member)(const struct btf_type *t, 717 const struct btf_member *member, 718 void *kdata, const void *udata); 719 int (*reg)(void *kdata); 720 void (*unreg)(void *kdata); 721 const struct btf_type *type; 722 const struct btf_type *value_type; 723 const char *name; 724 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS]; 725 u32 type_id; 726 u32 value_id; 727 }; 728 729 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL) 730 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA)) 731 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id); 732 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log); 733 bool bpf_struct_ops_get(const void *kdata); 734 void bpf_struct_ops_put(const void *kdata); 735 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key, 736 void *value); 737 static inline bool bpf_try_module_get(const void *data, struct module *owner) 738 { 739 if (owner == BPF_MODULE_OWNER) 740 return bpf_struct_ops_get(data); 741 else 742 return try_module_get(owner); 743 } 744 static inline void bpf_module_put(const void *data, struct module *owner) 745 { 746 if (owner == BPF_MODULE_OWNER) 747 bpf_struct_ops_put(data); 748 else 749 module_put(owner); 750 } 751 #else 752 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id) 753 { 754 return NULL; 755 } 756 static inline void bpf_struct_ops_init(struct btf *btf, 757 struct bpf_verifier_log *log) 758 { 759 } 760 static inline bool bpf_try_module_get(const void *data, struct module *owner) 761 { 762 return try_module_get(owner); 763 } 764 static inline void bpf_module_put(const void *data, struct module *owner) 765 { 766 module_put(owner); 767 } 768 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, 769 void *key, 770 void *value) 771 { 772 return -EINVAL; 773 } 774 #endif 775 776 struct bpf_array { 777 struct bpf_map map; 778 u32 elem_size; 779 u32 index_mask; 780 struct bpf_array_aux *aux; 781 union { 782 char value[0] __aligned(8); 783 void *ptrs[0] __aligned(8); 784 void __percpu *pptrs[0] __aligned(8); 785 }; 786 }; 787 788 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */ 789 #define MAX_TAIL_CALL_CNT 32 790 791 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \ 792 BPF_F_RDONLY_PROG | \ 793 BPF_F_WRONLY | \ 794 BPF_F_WRONLY_PROG) 795 796 #define BPF_MAP_CAN_READ BIT(0) 797 #define BPF_MAP_CAN_WRITE BIT(1) 798 799 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map) 800 { 801 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG); 802 803 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is 804 * not possible. 805 */ 806 if (access_flags & BPF_F_RDONLY_PROG) 807 return BPF_MAP_CAN_READ; 808 else if (access_flags & BPF_F_WRONLY_PROG) 809 return BPF_MAP_CAN_WRITE; 810 else 811 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE; 812 } 813 814 static inline bool bpf_map_flags_access_ok(u32 access_flags) 815 { 816 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) != 817 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG); 818 } 819 820 struct bpf_event_entry { 821 struct perf_event *event; 822 struct file *perf_file; 823 struct file *map_file; 824 struct rcu_head rcu; 825 }; 826 827 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp); 828 int bpf_prog_calc_tag(struct bpf_prog *fp); 829 const char *kernel_type_name(u32 btf_type_id); 830 831 const struct bpf_func_proto *bpf_get_trace_printk_proto(void); 832 833 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src, 834 unsigned long off, unsigned long len); 835 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type, 836 const struct bpf_insn *src, 837 struct bpf_insn *dst, 838 struct bpf_prog *prog, 839 u32 *target_size); 840 841 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, 842 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy); 843 844 /* an array of programs to be executed under rcu_lock. 845 * 846 * Typical usage: 847 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN); 848 * 849 * the structure returned by bpf_prog_array_alloc() should be populated 850 * with program pointers and the last pointer must be NULL. 851 * The user has to keep refcnt on the program and make sure the program 852 * is removed from the array before bpf_prog_put(). 853 * The 'struct bpf_prog_array *' should only be replaced with xchg() 854 * since other cpus are walking the array of pointers in parallel. 855 */ 856 struct bpf_prog_array_item { 857 struct bpf_prog *prog; 858 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]; 859 }; 860 861 struct bpf_prog_array { 862 struct rcu_head rcu; 863 struct bpf_prog_array_item items[0]; 864 }; 865 866 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags); 867 void bpf_prog_array_free(struct bpf_prog_array *progs); 868 int bpf_prog_array_length(struct bpf_prog_array *progs); 869 bool bpf_prog_array_is_empty(struct bpf_prog_array *array); 870 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs, 871 __u32 __user *prog_ids, u32 cnt); 872 873 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs, 874 struct bpf_prog *old_prog); 875 int bpf_prog_array_copy_info(struct bpf_prog_array *array, 876 u32 *prog_ids, u32 request_cnt, 877 u32 *prog_cnt); 878 int bpf_prog_array_copy(struct bpf_prog_array *old_array, 879 struct bpf_prog *exclude_prog, 880 struct bpf_prog *include_prog, 881 struct bpf_prog_array **new_array); 882 883 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null) \ 884 ({ \ 885 struct bpf_prog_array_item *_item; \ 886 struct bpf_prog *_prog; \ 887 struct bpf_prog_array *_array; \ 888 u32 _ret = 1; \ 889 preempt_disable(); \ 890 rcu_read_lock(); \ 891 _array = rcu_dereference(array); \ 892 if (unlikely(check_non_null && !_array))\ 893 goto _out; \ 894 _item = &_array->items[0]; \ 895 while ((_prog = READ_ONCE(_item->prog))) { \ 896 bpf_cgroup_storage_set(_item->cgroup_storage); \ 897 _ret &= func(_prog, ctx); \ 898 _item++; \ 899 } \ 900 _out: \ 901 rcu_read_unlock(); \ 902 preempt_enable(); \ 903 _ret; \ 904 }) 905 906 /* To be used by __cgroup_bpf_run_filter_skb for EGRESS BPF progs 907 * so BPF programs can request cwr for TCP packets. 908 * 909 * Current cgroup skb programs can only return 0 or 1 (0 to drop the 910 * packet. This macro changes the behavior so the low order bit 911 * indicates whether the packet should be dropped (0) or not (1) 912 * and the next bit is a congestion notification bit. This could be 913 * used by TCP to call tcp_enter_cwr() 914 * 915 * Hence, new allowed return values of CGROUP EGRESS BPF programs are: 916 * 0: drop packet 917 * 1: keep packet 918 * 2: drop packet and cn 919 * 3: keep packet and cn 920 * 921 * This macro then converts it to one of the NET_XMIT or an error 922 * code that is then interpreted as drop packet (and no cn): 923 * 0: NET_XMIT_SUCCESS skb should be transmitted 924 * 1: NET_XMIT_DROP skb should be dropped and cn 925 * 2: NET_XMIT_CN skb should be transmitted and cn 926 * 3: -EPERM skb should be dropped 927 */ 928 #define BPF_PROG_CGROUP_INET_EGRESS_RUN_ARRAY(array, ctx, func) \ 929 ({ \ 930 struct bpf_prog_array_item *_item; \ 931 struct bpf_prog *_prog; \ 932 struct bpf_prog_array *_array; \ 933 u32 ret; \ 934 u32 _ret = 1; \ 935 u32 _cn = 0; \ 936 preempt_disable(); \ 937 rcu_read_lock(); \ 938 _array = rcu_dereference(array); \ 939 _item = &_array->items[0]; \ 940 while ((_prog = READ_ONCE(_item->prog))) { \ 941 bpf_cgroup_storage_set(_item->cgroup_storage); \ 942 ret = func(_prog, ctx); \ 943 _ret &= (ret & 1); \ 944 _cn |= (ret & 2); \ 945 _item++; \ 946 } \ 947 rcu_read_unlock(); \ 948 preempt_enable(); \ 949 if (_ret) \ 950 _ret = (_cn ? NET_XMIT_CN : NET_XMIT_SUCCESS); \ 951 else \ 952 _ret = (_cn ? NET_XMIT_DROP : -EPERM); \ 953 _ret; \ 954 }) 955 956 #define BPF_PROG_RUN_ARRAY(array, ctx, func) \ 957 __BPF_PROG_RUN_ARRAY(array, ctx, func, false) 958 959 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \ 960 __BPF_PROG_RUN_ARRAY(array, ctx, func, true) 961 962 #ifdef CONFIG_BPF_SYSCALL 963 DECLARE_PER_CPU(int, bpf_prog_active); 964 965 extern const struct file_operations bpf_map_fops; 966 extern const struct file_operations bpf_prog_fops; 967 968 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \ 969 extern const struct bpf_prog_ops _name ## _prog_ops; \ 970 extern const struct bpf_verifier_ops _name ## _verifier_ops; 971 #define BPF_MAP_TYPE(_id, _ops) \ 972 extern const struct bpf_map_ops _ops; 973 #include <linux/bpf_types.h> 974 #undef BPF_PROG_TYPE 975 #undef BPF_MAP_TYPE 976 977 extern const struct bpf_prog_ops bpf_offload_prog_ops; 978 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops; 979 extern const struct bpf_verifier_ops xdp_analyzer_ops; 980 981 struct bpf_prog *bpf_prog_get(u32 ufd); 982 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, 983 bool attach_drv); 984 void bpf_prog_add(struct bpf_prog *prog, int i); 985 void bpf_prog_sub(struct bpf_prog *prog, int i); 986 void bpf_prog_inc(struct bpf_prog *prog); 987 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog); 988 void bpf_prog_put(struct bpf_prog *prog); 989 int __bpf_prog_charge(struct user_struct *user, u32 pages); 990 void __bpf_prog_uncharge(struct user_struct *user, u32 pages); 991 void __bpf_free_used_maps(struct bpf_prog_aux *aux, 992 struct bpf_map **used_maps, u32 len); 993 994 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock); 995 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock); 996 997 struct bpf_map *bpf_map_get_with_uref(u32 ufd); 998 struct bpf_map *__bpf_map_get(struct fd f); 999 void bpf_map_inc(struct bpf_map *map); 1000 void bpf_map_inc_with_uref(struct bpf_map *map); 1001 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map); 1002 void bpf_map_put_with_uref(struct bpf_map *map); 1003 void bpf_map_put(struct bpf_map *map); 1004 int bpf_map_charge_memlock(struct bpf_map *map, u32 pages); 1005 void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages); 1006 int bpf_map_charge_init(struct bpf_map_memory *mem, u64 size); 1007 void bpf_map_charge_finish(struct bpf_map_memory *mem); 1008 void bpf_map_charge_move(struct bpf_map_memory *dst, 1009 struct bpf_map_memory *src); 1010 void *bpf_map_area_alloc(u64 size, int numa_node); 1011 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node); 1012 void bpf_map_area_free(void *base); 1013 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr); 1014 int generic_map_lookup_batch(struct bpf_map *map, 1015 const union bpf_attr *attr, 1016 union bpf_attr __user *uattr); 1017 int generic_map_update_batch(struct bpf_map *map, 1018 const union bpf_attr *attr, 1019 union bpf_attr __user *uattr); 1020 int generic_map_delete_batch(struct bpf_map *map, 1021 const union bpf_attr *attr, 1022 union bpf_attr __user *uattr); 1023 1024 extern int sysctl_unprivileged_bpf_disabled; 1025 1026 int bpf_map_new_fd(struct bpf_map *map, int flags); 1027 int bpf_prog_new_fd(struct bpf_prog *prog); 1028 1029 int bpf_obj_pin_user(u32 ufd, const char __user *pathname); 1030 int bpf_obj_get_user(const char __user *pathname, int flags); 1031 1032 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value); 1033 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value); 1034 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value, 1035 u64 flags); 1036 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value, 1037 u64 flags); 1038 1039 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value); 1040 1041 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file, 1042 void *key, void *value, u64 map_flags); 1043 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 1044 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file, 1045 void *key, void *value, u64 map_flags); 1046 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 1047 1048 int bpf_get_file_flag(int flags); 1049 int bpf_check_uarg_tail_zero(void __user *uaddr, size_t expected_size, 1050 size_t actual_size); 1051 1052 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and 1053 * forced to use 'long' read/writes to try to atomically copy long counters. 1054 * Best-effort only. No barriers here, since it _will_ race with concurrent 1055 * updates from BPF programs. Called from bpf syscall and mostly used with 1056 * size 8 or 16 bytes, so ask compiler to inline it. 1057 */ 1058 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size) 1059 { 1060 const long *lsrc = src; 1061 long *ldst = dst; 1062 1063 size /= sizeof(long); 1064 while (size--) 1065 *ldst++ = *lsrc++; 1066 } 1067 1068 /* verify correctness of eBPF program */ 1069 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, 1070 union bpf_attr __user *uattr); 1071 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth); 1072 1073 /* Map specifics */ 1074 struct xdp_buff; 1075 struct sk_buff; 1076 1077 struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key); 1078 struct bpf_dtab_netdev *__dev_map_hash_lookup_elem(struct bpf_map *map, u32 key); 1079 void __dev_flush(void); 1080 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp, 1081 struct net_device *dev_rx); 1082 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, 1083 struct net_device *dev_rx); 1084 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb, 1085 struct bpf_prog *xdp_prog); 1086 1087 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key); 1088 void __cpu_map_flush(void); 1089 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp, 1090 struct net_device *dev_rx); 1091 1092 /* Return map's numa specified by userspace */ 1093 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr) 1094 { 1095 return (attr->map_flags & BPF_F_NUMA_NODE) ? 1096 attr->numa_node : NUMA_NO_NODE; 1097 } 1098 1099 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type); 1100 int array_map_alloc_check(union bpf_attr *attr); 1101 1102 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, 1103 union bpf_attr __user *uattr); 1104 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, 1105 union bpf_attr __user *uattr); 1106 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, 1107 const union bpf_attr *kattr, 1108 union bpf_attr __user *uattr); 1109 bool btf_ctx_access(int off, int size, enum bpf_access_type type, 1110 const struct bpf_prog *prog, 1111 struct bpf_insn_access_aux *info); 1112 int btf_struct_access(struct bpf_verifier_log *log, 1113 const struct btf_type *t, int off, int size, 1114 enum bpf_access_type atype, 1115 u32 *next_btf_id); 1116 int btf_resolve_helper_id(struct bpf_verifier_log *log, 1117 const struct bpf_func_proto *fn, int); 1118 1119 int btf_distill_func_proto(struct bpf_verifier_log *log, 1120 struct btf *btf, 1121 const struct btf_type *func_proto, 1122 const char *func_name, 1123 struct btf_func_model *m); 1124 1125 struct bpf_reg_state; 1126 int btf_check_func_arg_match(struct bpf_verifier_env *env, int subprog, 1127 struct bpf_reg_state *regs); 1128 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog, 1129 struct bpf_reg_state *reg); 1130 int btf_check_type_match(struct bpf_verifier_env *env, struct bpf_prog *prog, 1131 struct btf *btf, const struct btf_type *t); 1132 1133 struct bpf_prog *bpf_prog_by_id(u32 id); 1134 1135 #else /* !CONFIG_BPF_SYSCALL */ 1136 static inline struct bpf_prog *bpf_prog_get(u32 ufd) 1137 { 1138 return ERR_PTR(-EOPNOTSUPP); 1139 } 1140 1141 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, 1142 enum bpf_prog_type type, 1143 bool attach_drv) 1144 { 1145 return ERR_PTR(-EOPNOTSUPP); 1146 } 1147 1148 static inline void bpf_prog_add(struct bpf_prog *prog, int i) 1149 { 1150 } 1151 1152 static inline void bpf_prog_sub(struct bpf_prog *prog, int i) 1153 { 1154 } 1155 1156 static inline void bpf_prog_put(struct bpf_prog *prog) 1157 { 1158 } 1159 1160 static inline void bpf_prog_inc(struct bpf_prog *prog) 1161 { 1162 } 1163 1164 static inline struct bpf_prog *__must_check 1165 bpf_prog_inc_not_zero(struct bpf_prog *prog) 1166 { 1167 return ERR_PTR(-EOPNOTSUPP); 1168 } 1169 1170 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages) 1171 { 1172 return 0; 1173 } 1174 1175 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages) 1176 { 1177 } 1178 1179 static inline int bpf_obj_get_user(const char __user *pathname, int flags) 1180 { 1181 return -EOPNOTSUPP; 1182 } 1183 1184 static inline struct net_device *__dev_map_lookup_elem(struct bpf_map *map, 1185 u32 key) 1186 { 1187 return NULL; 1188 } 1189 1190 static inline struct net_device *__dev_map_hash_lookup_elem(struct bpf_map *map, 1191 u32 key) 1192 { 1193 return NULL; 1194 } 1195 1196 static inline void __dev_flush(void) 1197 { 1198 } 1199 1200 struct xdp_buff; 1201 struct bpf_dtab_netdev; 1202 1203 static inline 1204 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp, 1205 struct net_device *dev_rx) 1206 { 1207 return 0; 1208 } 1209 1210 static inline 1211 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, 1212 struct net_device *dev_rx) 1213 { 1214 return 0; 1215 } 1216 1217 struct sk_buff; 1218 1219 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, 1220 struct sk_buff *skb, 1221 struct bpf_prog *xdp_prog) 1222 { 1223 return 0; 1224 } 1225 1226 static inline 1227 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key) 1228 { 1229 return NULL; 1230 } 1231 1232 static inline void __cpu_map_flush(void) 1233 { 1234 } 1235 1236 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, 1237 struct xdp_buff *xdp, 1238 struct net_device *dev_rx) 1239 { 1240 return 0; 1241 } 1242 1243 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name, 1244 enum bpf_prog_type type) 1245 { 1246 return ERR_PTR(-EOPNOTSUPP); 1247 } 1248 1249 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog, 1250 const union bpf_attr *kattr, 1251 union bpf_attr __user *uattr) 1252 { 1253 return -ENOTSUPP; 1254 } 1255 1256 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog, 1257 const union bpf_attr *kattr, 1258 union bpf_attr __user *uattr) 1259 { 1260 return -ENOTSUPP; 1261 } 1262 1263 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, 1264 const union bpf_attr *kattr, 1265 union bpf_attr __user *uattr) 1266 { 1267 return -ENOTSUPP; 1268 } 1269 1270 static inline void bpf_map_put(struct bpf_map *map) 1271 { 1272 } 1273 1274 static inline struct bpf_prog *bpf_prog_by_id(u32 id) 1275 { 1276 return ERR_PTR(-ENOTSUPP); 1277 } 1278 #endif /* CONFIG_BPF_SYSCALL */ 1279 1280 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd, 1281 enum bpf_prog_type type) 1282 { 1283 return bpf_prog_get_type_dev(ufd, type, false); 1284 } 1285 1286 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool); 1287 1288 int bpf_prog_offload_compile(struct bpf_prog *prog); 1289 void bpf_prog_offload_destroy(struct bpf_prog *prog); 1290 int bpf_prog_offload_info_fill(struct bpf_prog_info *info, 1291 struct bpf_prog *prog); 1292 1293 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map); 1294 1295 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value); 1296 int bpf_map_offload_update_elem(struct bpf_map *map, 1297 void *key, void *value, u64 flags); 1298 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key); 1299 int bpf_map_offload_get_next_key(struct bpf_map *map, 1300 void *key, void *next_key); 1301 1302 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map); 1303 1304 struct bpf_offload_dev * 1305 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv); 1306 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev); 1307 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev); 1308 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev, 1309 struct net_device *netdev); 1310 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev, 1311 struct net_device *netdev); 1312 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev); 1313 1314 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL) 1315 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr); 1316 1317 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux) 1318 { 1319 return aux->offload_requested; 1320 } 1321 1322 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 1323 { 1324 return unlikely(map->ops == &bpf_map_offload_ops); 1325 } 1326 1327 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr); 1328 void bpf_map_offload_map_free(struct bpf_map *map); 1329 #else 1330 static inline int bpf_prog_offload_init(struct bpf_prog *prog, 1331 union bpf_attr *attr) 1332 { 1333 return -EOPNOTSUPP; 1334 } 1335 1336 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux) 1337 { 1338 return false; 1339 } 1340 1341 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 1342 { 1343 return false; 1344 } 1345 1346 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr) 1347 { 1348 return ERR_PTR(-EOPNOTSUPP); 1349 } 1350 1351 static inline void bpf_map_offload_map_free(struct bpf_map *map) 1352 { 1353 } 1354 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */ 1355 1356 #if defined(CONFIG_BPF_STREAM_PARSER) 1357 int sock_map_prog_update(struct bpf_map *map, struct bpf_prog *prog, u32 which); 1358 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog); 1359 #else 1360 static inline int sock_map_prog_update(struct bpf_map *map, 1361 struct bpf_prog *prog, u32 which) 1362 { 1363 return -EOPNOTSUPP; 1364 } 1365 1366 static inline int sock_map_get_from_fd(const union bpf_attr *attr, 1367 struct bpf_prog *prog) 1368 { 1369 return -EINVAL; 1370 } 1371 #endif 1372 1373 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) 1374 void bpf_sk_reuseport_detach(struct sock *sk); 1375 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key, 1376 void *value); 1377 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key, 1378 void *value, u64 map_flags); 1379 #else 1380 static inline void bpf_sk_reuseport_detach(struct sock *sk) 1381 { 1382 } 1383 1384 #ifdef CONFIG_BPF_SYSCALL 1385 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, 1386 void *key, void *value) 1387 { 1388 return -EOPNOTSUPP; 1389 } 1390 1391 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, 1392 void *key, void *value, 1393 u64 map_flags) 1394 { 1395 return -EOPNOTSUPP; 1396 } 1397 #endif /* CONFIG_BPF_SYSCALL */ 1398 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */ 1399 1400 /* verifier prototypes for helper functions called from eBPF programs */ 1401 extern const struct bpf_func_proto bpf_map_lookup_elem_proto; 1402 extern const struct bpf_func_proto bpf_map_update_elem_proto; 1403 extern const struct bpf_func_proto bpf_map_delete_elem_proto; 1404 extern const struct bpf_func_proto bpf_map_push_elem_proto; 1405 extern const struct bpf_func_proto bpf_map_pop_elem_proto; 1406 extern const struct bpf_func_proto bpf_map_peek_elem_proto; 1407 1408 extern const struct bpf_func_proto bpf_get_prandom_u32_proto; 1409 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto; 1410 extern const struct bpf_func_proto bpf_get_numa_node_id_proto; 1411 extern const struct bpf_func_proto bpf_tail_call_proto; 1412 extern const struct bpf_func_proto bpf_ktime_get_ns_proto; 1413 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto; 1414 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto; 1415 extern const struct bpf_func_proto bpf_get_current_comm_proto; 1416 extern const struct bpf_func_proto bpf_get_stackid_proto; 1417 extern const struct bpf_func_proto bpf_get_stack_proto; 1418 extern const struct bpf_func_proto bpf_sock_map_update_proto; 1419 extern const struct bpf_func_proto bpf_sock_hash_update_proto; 1420 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto; 1421 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto; 1422 extern const struct bpf_func_proto bpf_msg_redirect_map_proto; 1423 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto; 1424 extern const struct bpf_func_proto bpf_sk_redirect_map_proto; 1425 extern const struct bpf_func_proto bpf_spin_lock_proto; 1426 extern const struct bpf_func_proto bpf_spin_unlock_proto; 1427 extern const struct bpf_func_proto bpf_get_local_storage_proto; 1428 extern const struct bpf_func_proto bpf_strtol_proto; 1429 extern const struct bpf_func_proto bpf_strtoul_proto; 1430 extern const struct bpf_func_proto bpf_tcp_sock_proto; 1431 extern const struct bpf_func_proto bpf_jiffies64_proto; 1432 1433 /* Shared helpers among cBPF and eBPF. */ 1434 void bpf_user_rnd_init_once(void); 1435 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 1436 1437 #if defined(CONFIG_NET) 1438 bool bpf_sock_common_is_valid_access(int off, int size, 1439 enum bpf_access_type type, 1440 struct bpf_insn_access_aux *info); 1441 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type, 1442 struct bpf_insn_access_aux *info); 1443 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 1444 const struct bpf_insn *si, 1445 struct bpf_insn *insn_buf, 1446 struct bpf_prog *prog, 1447 u32 *target_size); 1448 #else 1449 static inline bool bpf_sock_common_is_valid_access(int off, int size, 1450 enum bpf_access_type type, 1451 struct bpf_insn_access_aux *info) 1452 { 1453 return false; 1454 } 1455 static inline bool bpf_sock_is_valid_access(int off, int size, 1456 enum bpf_access_type type, 1457 struct bpf_insn_access_aux *info) 1458 { 1459 return false; 1460 } 1461 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 1462 const struct bpf_insn *si, 1463 struct bpf_insn *insn_buf, 1464 struct bpf_prog *prog, 1465 u32 *target_size) 1466 { 1467 return 0; 1468 } 1469 #endif 1470 1471 #ifdef CONFIG_INET 1472 struct sk_reuseport_kern { 1473 struct sk_buff *skb; 1474 struct sock *sk; 1475 struct sock *selected_sk; 1476 void *data_end; 1477 u32 hash; 1478 u32 reuseport_id; 1479 bool bind_inany; 1480 }; 1481 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 1482 struct bpf_insn_access_aux *info); 1483 1484 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, 1485 const struct bpf_insn *si, 1486 struct bpf_insn *insn_buf, 1487 struct bpf_prog *prog, 1488 u32 *target_size); 1489 1490 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 1491 struct bpf_insn_access_aux *info); 1492 1493 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, 1494 const struct bpf_insn *si, 1495 struct bpf_insn *insn_buf, 1496 struct bpf_prog *prog, 1497 u32 *target_size); 1498 #else 1499 static inline bool bpf_tcp_sock_is_valid_access(int off, int size, 1500 enum bpf_access_type type, 1501 struct bpf_insn_access_aux *info) 1502 { 1503 return false; 1504 } 1505 1506 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, 1507 const struct bpf_insn *si, 1508 struct bpf_insn *insn_buf, 1509 struct bpf_prog *prog, 1510 u32 *target_size) 1511 { 1512 return 0; 1513 } 1514 static inline bool bpf_xdp_sock_is_valid_access(int off, int size, 1515 enum bpf_access_type type, 1516 struct bpf_insn_access_aux *info) 1517 { 1518 return false; 1519 } 1520 1521 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, 1522 const struct bpf_insn *si, 1523 struct bpf_insn *insn_buf, 1524 struct bpf_prog *prog, 1525 u32 *target_size) 1526 { 1527 return 0; 1528 } 1529 #endif /* CONFIG_INET */ 1530 1531 enum bpf_text_poke_type { 1532 BPF_MOD_CALL, 1533 BPF_MOD_JUMP, 1534 }; 1535 1536 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t, 1537 void *addr1, void *addr2); 1538 1539 #endif /* _LINUX_BPF_H */ 1540