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 #include <linux/kallsyms.h> 22 #include <linux/capability.h> 23 24 struct bpf_verifier_env; 25 struct bpf_verifier_log; 26 struct perf_event; 27 struct bpf_prog; 28 struct bpf_prog_aux; 29 struct bpf_map; 30 struct sock; 31 struct seq_file; 32 struct btf; 33 struct btf_type; 34 struct exception_table_entry; 35 struct seq_operations; 36 37 extern struct idr btf_idr; 38 extern spinlock_t btf_idr_lock; 39 40 /* map is generic key/value storage optionally accesible by eBPF programs */ 41 struct bpf_map_ops { 42 /* funcs callable from userspace (via syscall) */ 43 int (*map_alloc_check)(union bpf_attr *attr); 44 struct bpf_map *(*map_alloc)(union bpf_attr *attr); 45 void (*map_release)(struct bpf_map *map, struct file *map_file); 46 void (*map_free)(struct bpf_map *map); 47 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key); 48 void (*map_release_uref)(struct bpf_map *map); 49 void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key); 50 int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr, 51 union bpf_attr __user *uattr); 52 int (*map_lookup_and_delete_batch)(struct bpf_map *map, 53 const union bpf_attr *attr, 54 union bpf_attr __user *uattr); 55 int (*map_update_batch)(struct bpf_map *map, const union bpf_attr *attr, 56 union bpf_attr __user *uattr); 57 int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr, 58 union bpf_attr __user *uattr); 59 60 /* funcs callable from userspace and from eBPF programs */ 61 void *(*map_lookup_elem)(struct bpf_map *map, void *key); 62 int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags); 63 int (*map_delete_elem)(struct bpf_map *map, void *key); 64 int (*map_push_elem)(struct bpf_map *map, void *value, u64 flags); 65 int (*map_pop_elem)(struct bpf_map *map, void *value); 66 int (*map_peek_elem)(struct bpf_map *map, void *value); 67 68 /* funcs called by prog_array and perf_event_array map */ 69 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file, 70 int fd); 71 void (*map_fd_put_ptr)(void *ptr); 72 u32 (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf); 73 u32 (*map_fd_sys_lookup_elem)(void *ptr); 74 void (*map_seq_show_elem)(struct bpf_map *map, void *key, 75 struct seq_file *m); 76 int (*map_check_btf)(const struct bpf_map *map, 77 const struct btf *btf, 78 const struct btf_type *key_type, 79 const struct btf_type *value_type); 80 81 /* Prog poke tracking helpers. */ 82 int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux); 83 void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux); 84 void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old, 85 struct bpf_prog *new); 86 87 /* Direct value access helpers. */ 88 int (*map_direct_value_addr)(const struct bpf_map *map, 89 u64 *imm, u32 off); 90 int (*map_direct_value_meta)(const struct bpf_map *map, 91 u64 imm, u32 *off); 92 int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma); 93 __poll_t (*map_poll)(struct bpf_map *map, struct file *filp, 94 struct poll_table_struct *pts); 95 96 /* BTF name and id of struct allocated by map_alloc */ 97 const char * const map_btf_name; 98 int *map_btf_id; 99 }; 100 101 struct bpf_map_memory { 102 u32 pages; 103 struct user_struct *user; 104 }; 105 106 struct bpf_map { 107 /* The first two cachelines with read-mostly members of which some 108 * are also accessed in fast-path (e.g. ops, max_entries). 109 */ 110 const struct bpf_map_ops *ops ____cacheline_aligned; 111 struct bpf_map *inner_map_meta; 112 #ifdef CONFIG_SECURITY 113 void *security; 114 #endif 115 enum bpf_map_type map_type; 116 u32 key_size; 117 u32 value_size; 118 u32 max_entries; 119 u32 map_flags; 120 int spin_lock_off; /* >=0 valid offset, <0 error */ 121 u32 id; 122 int numa_node; 123 u32 btf_key_type_id; 124 u32 btf_value_type_id; 125 struct btf *btf; 126 struct bpf_map_memory memory; 127 char name[BPF_OBJ_NAME_LEN]; 128 u32 btf_vmlinux_value_type_id; 129 bool bypass_spec_v1; 130 bool frozen; /* write-once; write-protected by freeze_mutex */ 131 /* 22 bytes hole */ 132 133 /* The 3rd and 4th cacheline with misc members to avoid false sharing 134 * particularly with refcounting. 135 */ 136 atomic64_t refcnt ____cacheline_aligned; 137 atomic64_t usercnt; 138 struct work_struct work; 139 struct mutex freeze_mutex; 140 u64 writecnt; /* writable mmap cnt; protected by freeze_mutex */ 141 }; 142 143 static inline bool map_value_has_spin_lock(const struct bpf_map *map) 144 { 145 return map->spin_lock_off >= 0; 146 } 147 148 static inline void check_and_init_map_lock(struct bpf_map *map, void *dst) 149 { 150 if (likely(!map_value_has_spin_lock(map))) 151 return; 152 *(struct bpf_spin_lock *)(dst + map->spin_lock_off) = 153 (struct bpf_spin_lock){}; 154 } 155 156 /* copy everything but bpf_spin_lock */ 157 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src) 158 { 159 if (unlikely(map_value_has_spin_lock(map))) { 160 u32 off = map->spin_lock_off; 161 162 memcpy(dst, src, off); 163 memcpy(dst + off + sizeof(struct bpf_spin_lock), 164 src + off + sizeof(struct bpf_spin_lock), 165 map->value_size - off - sizeof(struct bpf_spin_lock)); 166 } else { 167 memcpy(dst, src, map->value_size); 168 } 169 } 170 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src, 171 bool lock_src); 172 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size); 173 174 struct bpf_offload_dev; 175 struct bpf_offloaded_map; 176 177 struct bpf_map_dev_ops { 178 int (*map_get_next_key)(struct bpf_offloaded_map *map, 179 void *key, void *next_key); 180 int (*map_lookup_elem)(struct bpf_offloaded_map *map, 181 void *key, void *value); 182 int (*map_update_elem)(struct bpf_offloaded_map *map, 183 void *key, void *value, u64 flags); 184 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key); 185 }; 186 187 struct bpf_offloaded_map { 188 struct bpf_map map; 189 struct net_device *netdev; 190 const struct bpf_map_dev_ops *dev_ops; 191 void *dev_priv; 192 struct list_head offloads; 193 }; 194 195 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map) 196 { 197 return container_of(map, struct bpf_offloaded_map, map); 198 } 199 200 static inline bool bpf_map_offload_neutral(const struct bpf_map *map) 201 { 202 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY; 203 } 204 205 static inline bool bpf_map_support_seq_show(const struct bpf_map *map) 206 { 207 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) && 208 map->ops->map_seq_show_elem; 209 } 210 211 int map_check_no_btf(const struct bpf_map *map, 212 const struct btf *btf, 213 const struct btf_type *key_type, 214 const struct btf_type *value_type); 215 216 extern const struct bpf_map_ops bpf_map_offload_ops; 217 218 /* function argument constraints */ 219 enum bpf_arg_type { 220 ARG_DONTCARE = 0, /* unused argument in helper function */ 221 222 /* the following constraints used to prototype 223 * bpf_map_lookup/update/delete_elem() functions 224 */ 225 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */ 226 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */ 227 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */ 228 ARG_PTR_TO_UNINIT_MAP_VALUE, /* pointer to valid memory used to store a map value */ 229 ARG_PTR_TO_MAP_VALUE_OR_NULL, /* pointer to stack used as map value or NULL */ 230 231 /* the following constraints used to prototype bpf_memcmp() and other 232 * functions that access data on eBPF program stack 233 */ 234 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */ 235 ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */ 236 ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized, 237 * helper function must fill all bytes or clear 238 * them in error case. 239 */ 240 241 ARG_CONST_SIZE, /* number of bytes accessed from memory */ 242 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */ 243 244 ARG_PTR_TO_CTX, /* pointer to context */ 245 ARG_PTR_TO_CTX_OR_NULL, /* pointer to context or NULL */ 246 ARG_ANYTHING, /* any (initialized) argument is ok */ 247 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */ 248 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */ 249 ARG_PTR_TO_INT, /* pointer to int */ 250 ARG_PTR_TO_LONG, /* pointer to long */ 251 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */ 252 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */ 253 ARG_PTR_TO_ALLOC_MEM, /* pointer to dynamically allocated memory */ 254 ARG_PTR_TO_ALLOC_MEM_OR_NULL, /* pointer to dynamically allocated memory or NULL */ 255 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */ 256 }; 257 258 /* type of values returned from helper functions */ 259 enum bpf_return_type { 260 RET_INTEGER, /* function returns integer */ 261 RET_VOID, /* function doesn't return anything */ 262 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */ 263 RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */ 264 RET_PTR_TO_SOCKET_OR_NULL, /* returns a pointer to a socket or NULL */ 265 RET_PTR_TO_TCP_SOCK_OR_NULL, /* returns a pointer to a tcp_sock or NULL */ 266 RET_PTR_TO_SOCK_COMMON_OR_NULL, /* returns a pointer to a sock_common or NULL */ 267 RET_PTR_TO_ALLOC_MEM_OR_NULL, /* returns a pointer to dynamically allocated memory or NULL */ 268 RET_PTR_TO_BTF_ID_OR_NULL, /* returns a pointer to a btf_id or NULL */ 269 }; 270 271 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs 272 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL 273 * instructions after verifying 274 */ 275 struct bpf_func_proto { 276 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 277 bool gpl_only; 278 bool pkt_access; 279 enum bpf_return_type ret_type; 280 union { 281 struct { 282 enum bpf_arg_type arg1_type; 283 enum bpf_arg_type arg2_type; 284 enum bpf_arg_type arg3_type; 285 enum bpf_arg_type arg4_type; 286 enum bpf_arg_type arg5_type; 287 }; 288 enum bpf_arg_type arg_type[5]; 289 }; 290 int *btf_id; /* BTF ids of arguments */ 291 bool (*check_btf_id)(u32 btf_id, u32 arg); /* if the argument btf_id is 292 * valid. Often used if more 293 * than one btf id is permitted 294 * for this argument. 295 */ 296 int *ret_btf_id; /* return value btf_id */ 297 }; 298 299 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is 300 * the first argument to eBPF programs. 301 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *' 302 */ 303 struct bpf_context; 304 305 enum bpf_access_type { 306 BPF_READ = 1, 307 BPF_WRITE = 2 308 }; 309 310 /* types of values stored in eBPF registers */ 311 /* Pointer types represent: 312 * pointer 313 * pointer + imm 314 * pointer + (u16) var 315 * pointer + (u16) var + imm 316 * if (range > 0) then [ptr, ptr + range - off) is safe to access 317 * if (id > 0) means that some 'var' was added 318 * if (off > 0) means that 'imm' was added 319 */ 320 enum bpf_reg_type { 321 NOT_INIT = 0, /* nothing was written into register */ 322 SCALAR_VALUE, /* reg doesn't contain a valid pointer */ 323 PTR_TO_CTX, /* reg points to bpf_context */ 324 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */ 325 PTR_TO_MAP_VALUE, /* reg points to map element value */ 326 PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */ 327 PTR_TO_STACK, /* reg == frame_pointer + offset */ 328 PTR_TO_PACKET_META, /* skb->data - meta_len */ 329 PTR_TO_PACKET, /* reg points to skb->data */ 330 PTR_TO_PACKET_END, /* skb->data + headlen */ 331 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */ 332 PTR_TO_SOCKET, /* reg points to struct bpf_sock */ 333 PTR_TO_SOCKET_OR_NULL, /* reg points to struct bpf_sock or NULL */ 334 PTR_TO_SOCK_COMMON, /* reg points to sock_common */ 335 PTR_TO_SOCK_COMMON_OR_NULL, /* reg points to sock_common or NULL */ 336 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */ 337 PTR_TO_TCP_SOCK_OR_NULL, /* reg points to struct tcp_sock or NULL */ 338 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */ 339 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */ 340 PTR_TO_BTF_ID, /* reg points to kernel struct */ 341 PTR_TO_BTF_ID_OR_NULL, /* reg points to kernel struct or NULL */ 342 PTR_TO_MEM, /* reg points to valid memory region */ 343 PTR_TO_MEM_OR_NULL, /* reg points to valid memory region or NULL */ 344 }; 345 346 /* The information passed from prog-specific *_is_valid_access 347 * back to the verifier. 348 */ 349 struct bpf_insn_access_aux { 350 enum bpf_reg_type reg_type; 351 union { 352 int ctx_field_size; 353 u32 btf_id; 354 }; 355 struct bpf_verifier_log *log; /* for verbose logs */ 356 }; 357 358 static inline void 359 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size) 360 { 361 aux->ctx_field_size = size; 362 } 363 364 struct bpf_prog_ops { 365 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr, 366 union bpf_attr __user *uattr); 367 }; 368 369 struct bpf_verifier_ops { 370 /* return eBPF function prototype for verification */ 371 const struct bpf_func_proto * 372 (*get_func_proto)(enum bpf_func_id func_id, 373 const struct bpf_prog *prog); 374 375 /* return true if 'size' wide access at offset 'off' within bpf_context 376 * with 'type' (read or write) is allowed 377 */ 378 bool (*is_valid_access)(int off, int size, enum bpf_access_type type, 379 const struct bpf_prog *prog, 380 struct bpf_insn_access_aux *info); 381 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write, 382 const struct bpf_prog *prog); 383 int (*gen_ld_abs)(const struct bpf_insn *orig, 384 struct bpf_insn *insn_buf); 385 u32 (*convert_ctx_access)(enum bpf_access_type type, 386 const struct bpf_insn *src, 387 struct bpf_insn *dst, 388 struct bpf_prog *prog, u32 *target_size); 389 int (*btf_struct_access)(struct bpf_verifier_log *log, 390 const struct btf_type *t, int off, int size, 391 enum bpf_access_type atype, 392 u32 *next_btf_id); 393 }; 394 395 struct bpf_prog_offload_ops { 396 /* verifier basic callbacks */ 397 int (*insn_hook)(struct bpf_verifier_env *env, 398 int insn_idx, int prev_insn_idx); 399 int (*finalize)(struct bpf_verifier_env *env); 400 /* verifier optimization callbacks (called after .finalize) */ 401 int (*replace_insn)(struct bpf_verifier_env *env, u32 off, 402 struct bpf_insn *insn); 403 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt); 404 /* program management callbacks */ 405 int (*prepare)(struct bpf_prog *prog); 406 int (*translate)(struct bpf_prog *prog); 407 void (*destroy)(struct bpf_prog *prog); 408 }; 409 410 struct bpf_prog_offload { 411 struct bpf_prog *prog; 412 struct net_device *netdev; 413 struct bpf_offload_dev *offdev; 414 void *dev_priv; 415 struct list_head offloads; 416 bool dev_state; 417 bool opt_failed; 418 void *jited_image; 419 u32 jited_len; 420 }; 421 422 enum bpf_cgroup_storage_type { 423 BPF_CGROUP_STORAGE_SHARED, 424 BPF_CGROUP_STORAGE_PERCPU, 425 __BPF_CGROUP_STORAGE_MAX 426 }; 427 428 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX 429 430 /* The longest tracepoint has 12 args. 431 * See include/trace/bpf_probe.h 432 */ 433 #define MAX_BPF_FUNC_ARGS 12 434 435 struct bpf_prog_stats { 436 u64 cnt; 437 u64 nsecs; 438 struct u64_stats_sync syncp; 439 } __aligned(2 * sizeof(u64)); 440 441 struct btf_func_model { 442 u8 ret_size; 443 u8 nr_args; 444 u8 arg_size[MAX_BPF_FUNC_ARGS]; 445 }; 446 447 /* Restore arguments before returning from trampoline to let original function 448 * continue executing. This flag is used for fentry progs when there are no 449 * fexit progs. 450 */ 451 #define BPF_TRAMP_F_RESTORE_REGS BIT(0) 452 /* Call original function after fentry progs, but before fexit progs. 453 * Makes sense for fentry/fexit, normal calls and indirect calls. 454 */ 455 #define BPF_TRAMP_F_CALL_ORIG BIT(1) 456 /* Skip current frame and return to parent. Makes sense for fentry/fexit 457 * programs only. Should not be used with normal calls and indirect calls. 458 */ 459 #define BPF_TRAMP_F_SKIP_FRAME BIT(2) 460 461 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50 462 * bytes on x86. Pick a number to fit into BPF_IMAGE_SIZE / 2 463 */ 464 #define BPF_MAX_TRAMP_PROGS 40 465 466 struct bpf_tramp_progs { 467 struct bpf_prog *progs[BPF_MAX_TRAMP_PROGS]; 468 int nr_progs; 469 }; 470 471 /* Different use cases for BPF trampoline: 472 * 1. replace nop at the function entry (kprobe equivalent) 473 * flags = BPF_TRAMP_F_RESTORE_REGS 474 * fentry = a set of programs to run before returning from trampoline 475 * 476 * 2. replace nop at the function entry (kprobe + kretprobe equivalent) 477 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME 478 * orig_call = fentry_ip + MCOUNT_INSN_SIZE 479 * fentry = a set of program to run before calling original function 480 * fexit = a set of program to run after original function 481 * 482 * 3. replace direct call instruction anywhere in the function body 483 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid) 484 * With flags = 0 485 * fentry = a set of programs to run before returning from trampoline 486 * With flags = BPF_TRAMP_F_CALL_ORIG 487 * orig_call = original callback addr or direct function addr 488 * fentry = a set of program to run before calling original function 489 * fexit = a set of program to run after original function 490 */ 491 int arch_prepare_bpf_trampoline(void *image, void *image_end, 492 const struct btf_func_model *m, u32 flags, 493 struct bpf_tramp_progs *tprogs, 494 void *orig_call); 495 /* these two functions are called from generated trampoline */ 496 u64 notrace __bpf_prog_enter(void); 497 void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start); 498 499 struct bpf_ksym { 500 unsigned long start; 501 unsigned long end; 502 char name[KSYM_NAME_LEN]; 503 struct list_head lnode; 504 struct latch_tree_node tnode; 505 bool prog; 506 }; 507 508 enum bpf_tramp_prog_type { 509 BPF_TRAMP_FENTRY, 510 BPF_TRAMP_FEXIT, 511 BPF_TRAMP_MODIFY_RETURN, 512 BPF_TRAMP_MAX, 513 BPF_TRAMP_REPLACE, /* more than MAX */ 514 }; 515 516 struct bpf_trampoline { 517 /* hlist for trampoline_table */ 518 struct hlist_node hlist; 519 /* serializes access to fields of this trampoline */ 520 struct mutex mutex; 521 refcount_t refcnt; 522 u64 key; 523 struct { 524 struct btf_func_model model; 525 void *addr; 526 bool ftrace_managed; 527 } func; 528 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF 529 * program by replacing one of its functions. func.addr is the address 530 * of the function it replaced. 531 */ 532 struct bpf_prog *extension_prog; 533 /* list of BPF programs using this trampoline */ 534 struct hlist_head progs_hlist[BPF_TRAMP_MAX]; 535 /* Number of attached programs. A counter per kind. */ 536 int progs_cnt[BPF_TRAMP_MAX]; 537 /* Executable image of trampoline */ 538 void *image; 539 u64 selector; 540 struct bpf_ksym ksym; 541 }; 542 543 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */ 544 545 struct bpf_dispatcher_prog { 546 struct bpf_prog *prog; 547 refcount_t users; 548 }; 549 550 struct bpf_dispatcher { 551 /* dispatcher mutex */ 552 struct mutex mutex; 553 void *func; 554 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX]; 555 int num_progs; 556 void *image; 557 u32 image_off; 558 struct bpf_ksym ksym; 559 }; 560 561 static __always_inline unsigned int bpf_dispatcher_nop_func( 562 const void *ctx, 563 const struct bpf_insn *insnsi, 564 unsigned int (*bpf_func)(const void *, 565 const struct bpf_insn *)) 566 { 567 return bpf_func(ctx, insnsi); 568 } 569 #ifdef CONFIG_BPF_JIT 570 struct bpf_trampoline *bpf_trampoline_lookup(u64 key); 571 int bpf_trampoline_link_prog(struct bpf_prog *prog); 572 int bpf_trampoline_unlink_prog(struct bpf_prog *prog); 573 void bpf_trampoline_put(struct bpf_trampoline *tr); 574 #define BPF_DISPATCHER_INIT(_name) { \ 575 .mutex = __MUTEX_INITIALIZER(_name.mutex), \ 576 .func = &_name##_func, \ 577 .progs = {}, \ 578 .num_progs = 0, \ 579 .image = NULL, \ 580 .image_off = 0, \ 581 .ksym = { \ 582 .name = #_name, \ 583 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \ 584 }, \ 585 } 586 587 #define DEFINE_BPF_DISPATCHER(name) \ 588 noinline unsigned int bpf_dispatcher_##name##_func( \ 589 const void *ctx, \ 590 const struct bpf_insn *insnsi, \ 591 unsigned int (*bpf_func)(const void *, \ 592 const struct bpf_insn *)) \ 593 { \ 594 return bpf_func(ctx, insnsi); \ 595 } \ 596 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \ 597 struct bpf_dispatcher bpf_dispatcher_##name = \ 598 BPF_DISPATCHER_INIT(bpf_dispatcher_##name); 599 #define DECLARE_BPF_DISPATCHER(name) \ 600 unsigned int bpf_dispatcher_##name##_func( \ 601 const void *ctx, \ 602 const struct bpf_insn *insnsi, \ 603 unsigned int (*bpf_func)(const void *, \ 604 const struct bpf_insn *)); \ 605 extern struct bpf_dispatcher bpf_dispatcher_##name; 606 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func 607 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name) 608 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from, 609 struct bpf_prog *to); 610 /* Called only from JIT-enabled code, so there's no need for stubs. */ 611 void *bpf_jit_alloc_exec_page(void); 612 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym); 613 void bpf_image_ksym_del(struct bpf_ksym *ksym); 614 void bpf_ksym_add(struct bpf_ksym *ksym); 615 void bpf_ksym_del(struct bpf_ksym *ksym); 616 #else 617 static inline struct bpf_trampoline *bpf_trampoline_lookup(u64 key) 618 { 619 return NULL; 620 } 621 static inline int bpf_trampoline_link_prog(struct bpf_prog *prog) 622 { 623 return -ENOTSUPP; 624 } 625 static inline int bpf_trampoline_unlink_prog(struct bpf_prog *prog) 626 { 627 return -ENOTSUPP; 628 } 629 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {} 630 #define DEFINE_BPF_DISPATCHER(name) 631 #define DECLARE_BPF_DISPATCHER(name) 632 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func 633 #define BPF_DISPATCHER_PTR(name) NULL 634 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, 635 struct bpf_prog *from, 636 struct bpf_prog *to) {} 637 static inline bool is_bpf_image_address(unsigned long address) 638 { 639 return false; 640 } 641 #endif 642 643 struct bpf_func_info_aux { 644 u16 linkage; 645 bool unreliable; 646 }; 647 648 enum bpf_jit_poke_reason { 649 BPF_POKE_REASON_TAIL_CALL, 650 }; 651 652 /* Descriptor of pokes pointing /into/ the JITed image. */ 653 struct bpf_jit_poke_descriptor { 654 void *ip; 655 union { 656 struct { 657 struct bpf_map *map; 658 u32 key; 659 } tail_call; 660 }; 661 bool ip_stable; 662 u8 adj_off; 663 u16 reason; 664 }; 665 666 /* reg_type info for ctx arguments */ 667 struct bpf_ctx_arg_aux { 668 u32 offset; 669 enum bpf_reg_type reg_type; 670 }; 671 672 struct bpf_prog_aux { 673 atomic64_t refcnt; 674 u32 used_map_cnt; 675 u32 max_ctx_offset; 676 u32 max_pkt_offset; 677 u32 max_tp_access; 678 u32 stack_depth; 679 u32 id; 680 u32 func_cnt; /* used by non-func prog as the number of func progs */ 681 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */ 682 u32 attach_btf_id; /* in-kernel BTF type id to attach to */ 683 u32 ctx_arg_info_size; 684 const struct bpf_ctx_arg_aux *ctx_arg_info; 685 struct bpf_prog *linked_prog; 686 bool verifier_zext; /* Zero extensions has been inserted by verifier. */ 687 bool offload_requested; 688 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */ 689 bool func_proto_unreliable; 690 enum bpf_tramp_prog_type trampoline_prog_type; 691 struct bpf_trampoline *trampoline; 692 struct hlist_node tramp_hlist; 693 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */ 694 const struct btf_type *attach_func_proto; 695 /* function name for valid attach_btf_id */ 696 const char *attach_func_name; 697 struct bpf_prog **func; 698 void *jit_data; /* JIT specific data. arch dependent */ 699 struct bpf_jit_poke_descriptor *poke_tab; 700 u32 size_poke_tab; 701 struct bpf_ksym ksym; 702 const struct bpf_prog_ops *ops; 703 struct bpf_map **used_maps; 704 struct bpf_prog *prog; 705 struct user_struct *user; 706 u64 load_time; /* ns since boottime */ 707 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]; 708 char name[BPF_OBJ_NAME_LEN]; 709 #ifdef CONFIG_SECURITY 710 void *security; 711 #endif 712 struct bpf_prog_offload *offload; 713 struct btf *btf; 714 struct bpf_func_info *func_info; 715 struct bpf_func_info_aux *func_info_aux; 716 /* bpf_line_info loaded from userspace. linfo->insn_off 717 * has the xlated insn offset. 718 * Both the main and sub prog share the same linfo. 719 * The subprog can access its first linfo by 720 * using the linfo_idx. 721 */ 722 struct bpf_line_info *linfo; 723 /* jited_linfo is the jited addr of the linfo. It has a 724 * one to one mapping to linfo: 725 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off. 726 * Both the main and sub prog share the same jited_linfo. 727 * The subprog can access its first jited_linfo by 728 * using the linfo_idx. 729 */ 730 void **jited_linfo; 731 u32 func_info_cnt; 732 u32 nr_linfo; 733 /* subprog can use linfo_idx to access its first linfo and 734 * jited_linfo. 735 * main prog always has linfo_idx == 0 736 */ 737 u32 linfo_idx; 738 u32 num_exentries; 739 struct exception_table_entry *extable; 740 struct bpf_prog_stats __percpu *stats; 741 union { 742 struct work_struct work; 743 struct rcu_head rcu; 744 }; 745 }; 746 747 struct bpf_array_aux { 748 /* 'Ownership' of prog array is claimed by the first program that 749 * is going to use this map or by the first program which FD is 750 * stored in the map to make sure that all callers and callees have 751 * the same prog type and JITed flag. 752 */ 753 enum bpf_prog_type type; 754 bool jited; 755 /* Programs with direct jumps into programs part of this array. */ 756 struct list_head poke_progs; 757 struct bpf_map *map; 758 struct mutex poke_mutex; 759 struct work_struct work; 760 }; 761 762 struct bpf_struct_ops_value; 763 struct btf_type; 764 struct btf_member; 765 766 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64 767 struct bpf_struct_ops { 768 const struct bpf_verifier_ops *verifier_ops; 769 int (*init)(struct btf *btf); 770 int (*check_member)(const struct btf_type *t, 771 const struct btf_member *member); 772 int (*init_member)(const struct btf_type *t, 773 const struct btf_member *member, 774 void *kdata, const void *udata); 775 int (*reg)(void *kdata); 776 void (*unreg)(void *kdata); 777 const struct btf_type *type; 778 const struct btf_type *value_type; 779 const char *name; 780 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS]; 781 u32 type_id; 782 u32 value_id; 783 }; 784 785 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL) 786 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA)) 787 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id); 788 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log); 789 bool bpf_struct_ops_get(const void *kdata); 790 void bpf_struct_ops_put(const void *kdata); 791 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key, 792 void *value); 793 static inline bool bpf_try_module_get(const void *data, struct module *owner) 794 { 795 if (owner == BPF_MODULE_OWNER) 796 return bpf_struct_ops_get(data); 797 else 798 return try_module_get(owner); 799 } 800 static inline void bpf_module_put(const void *data, struct module *owner) 801 { 802 if (owner == BPF_MODULE_OWNER) 803 bpf_struct_ops_put(data); 804 else 805 module_put(owner); 806 } 807 #else 808 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id) 809 { 810 return NULL; 811 } 812 static inline void bpf_struct_ops_init(struct btf *btf, 813 struct bpf_verifier_log *log) 814 { 815 } 816 static inline bool bpf_try_module_get(const void *data, struct module *owner) 817 { 818 return try_module_get(owner); 819 } 820 static inline void bpf_module_put(const void *data, struct module *owner) 821 { 822 module_put(owner); 823 } 824 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, 825 void *key, 826 void *value) 827 { 828 return -EINVAL; 829 } 830 #endif 831 832 struct bpf_array { 833 struct bpf_map map; 834 u32 elem_size; 835 u32 index_mask; 836 struct bpf_array_aux *aux; 837 union { 838 char value[0] __aligned(8); 839 void *ptrs[0] __aligned(8); 840 void __percpu *pptrs[0] __aligned(8); 841 }; 842 }; 843 844 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */ 845 #define MAX_TAIL_CALL_CNT 32 846 847 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \ 848 BPF_F_RDONLY_PROG | \ 849 BPF_F_WRONLY | \ 850 BPF_F_WRONLY_PROG) 851 852 #define BPF_MAP_CAN_READ BIT(0) 853 #define BPF_MAP_CAN_WRITE BIT(1) 854 855 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map) 856 { 857 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG); 858 859 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is 860 * not possible. 861 */ 862 if (access_flags & BPF_F_RDONLY_PROG) 863 return BPF_MAP_CAN_READ; 864 else if (access_flags & BPF_F_WRONLY_PROG) 865 return BPF_MAP_CAN_WRITE; 866 else 867 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE; 868 } 869 870 static inline bool bpf_map_flags_access_ok(u32 access_flags) 871 { 872 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) != 873 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG); 874 } 875 876 struct bpf_event_entry { 877 struct perf_event *event; 878 struct file *perf_file; 879 struct file *map_file; 880 struct rcu_head rcu; 881 }; 882 883 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp); 884 int bpf_prog_calc_tag(struct bpf_prog *fp); 885 const char *kernel_type_name(u32 btf_type_id); 886 887 const struct bpf_func_proto *bpf_get_trace_printk_proto(void); 888 889 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src, 890 unsigned long off, unsigned long len); 891 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type, 892 const struct bpf_insn *src, 893 struct bpf_insn *dst, 894 struct bpf_prog *prog, 895 u32 *target_size); 896 897 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, 898 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy); 899 900 /* an array of programs to be executed under rcu_lock. 901 * 902 * Typical usage: 903 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN); 904 * 905 * the structure returned by bpf_prog_array_alloc() should be populated 906 * with program pointers and the last pointer must be NULL. 907 * The user has to keep refcnt on the program and make sure the program 908 * is removed from the array before bpf_prog_put(). 909 * The 'struct bpf_prog_array *' should only be replaced with xchg() 910 * since other cpus are walking the array of pointers in parallel. 911 */ 912 struct bpf_prog_array_item { 913 struct bpf_prog *prog; 914 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]; 915 }; 916 917 struct bpf_prog_array { 918 struct rcu_head rcu; 919 struct bpf_prog_array_item items[]; 920 }; 921 922 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags); 923 void bpf_prog_array_free(struct bpf_prog_array *progs); 924 int bpf_prog_array_length(struct bpf_prog_array *progs); 925 bool bpf_prog_array_is_empty(struct bpf_prog_array *array); 926 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs, 927 __u32 __user *prog_ids, u32 cnt); 928 929 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs, 930 struct bpf_prog *old_prog); 931 int bpf_prog_array_copy_info(struct bpf_prog_array *array, 932 u32 *prog_ids, u32 request_cnt, 933 u32 *prog_cnt); 934 int bpf_prog_array_copy(struct bpf_prog_array *old_array, 935 struct bpf_prog *exclude_prog, 936 struct bpf_prog *include_prog, 937 struct bpf_prog_array **new_array); 938 939 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null) \ 940 ({ \ 941 struct bpf_prog_array_item *_item; \ 942 struct bpf_prog *_prog; \ 943 struct bpf_prog_array *_array; \ 944 u32 _ret = 1; \ 945 migrate_disable(); \ 946 rcu_read_lock(); \ 947 _array = rcu_dereference(array); \ 948 if (unlikely(check_non_null && !_array))\ 949 goto _out; \ 950 _item = &_array->items[0]; \ 951 while ((_prog = READ_ONCE(_item->prog))) { \ 952 bpf_cgroup_storage_set(_item->cgroup_storage); \ 953 _ret &= func(_prog, ctx); \ 954 _item++; \ 955 } \ 956 _out: \ 957 rcu_read_unlock(); \ 958 migrate_enable(); \ 959 _ret; \ 960 }) 961 962 /* To be used by __cgroup_bpf_run_filter_skb for EGRESS BPF progs 963 * so BPF programs can request cwr for TCP packets. 964 * 965 * Current cgroup skb programs can only return 0 or 1 (0 to drop the 966 * packet. This macro changes the behavior so the low order bit 967 * indicates whether the packet should be dropped (0) or not (1) 968 * and the next bit is a congestion notification bit. This could be 969 * used by TCP to call tcp_enter_cwr() 970 * 971 * Hence, new allowed return values of CGROUP EGRESS BPF programs are: 972 * 0: drop packet 973 * 1: keep packet 974 * 2: drop packet and cn 975 * 3: keep packet and cn 976 * 977 * This macro then converts it to one of the NET_XMIT or an error 978 * code that is then interpreted as drop packet (and no cn): 979 * 0: NET_XMIT_SUCCESS skb should be transmitted 980 * 1: NET_XMIT_DROP skb should be dropped and cn 981 * 2: NET_XMIT_CN skb should be transmitted and cn 982 * 3: -EPERM skb should be dropped 983 */ 984 #define BPF_PROG_CGROUP_INET_EGRESS_RUN_ARRAY(array, ctx, func) \ 985 ({ \ 986 struct bpf_prog_array_item *_item; \ 987 struct bpf_prog *_prog; \ 988 struct bpf_prog_array *_array; \ 989 u32 ret; \ 990 u32 _ret = 1; \ 991 u32 _cn = 0; \ 992 migrate_disable(); \ 993 rcu_read_lock(); \ 994 _array = rcu_dereference(array); \ 995 _item = &_array->items[0]; \ 996 while ((_prog = READ_ONCE(_item->prog))) { \ 997 bpf_cgroup_storage_set(_item->cgroup_storage); \ 998 ret = func(_prog, ctx); \ 999 _ret &= (ret & 1); \ 1000 _cn |= (ret & 2); \ 1001 _item++; \ 1002 } \ 1003 rcu_read_unlock(); \ 1004 migrate_enable(); \ 1005 if (_ret) \ 1006 _ret = (_cn ? NET_XMIT_CN : NET_XMIT_SUCCESS); \ 1007 else \ 1008 _ret = (_cn ? NET_XMIT_DROP : -EPERM); \ 1009 _ret; \ 1010 }) 1011 1012 #define BPF_PROG_RUN_ARRAY(array, ctx, func) \ 1013 __BPF_PROG_RUN_ARRAY(array, ctx, func, false) 1014 1015 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \ 1016 __BPF_PROG_RUN_ARRAY(array, ctx, func, true) 1017 1018 #ifdef CONFIG_BPF_SYSCALL 1019 DECLARE_PER_CPU(int, bpf_prog_active); 1020 extern struct mutex bpf_stats_enabled_mutex; 1021 1022 /* 1023 * Block execution of BPF programs attached to instrumentation (perf, 1024 * kprobes, tracepoints) to prevent deadlocks on map operations as any of 1025 * these events can happen inside a region which holds a map bucket lock 1026 * and can deadlock on it. 1027 * 1028 * Use the preemption safe inc/dec variants on RT because migrate disable 1029 * is preemptible on RT and preemption in the middle of the RMW operation 1030 * might lead to inconsistent state. Use the raw variants for non RT 1031 * kernels as migrate_disable() maps to preempt_disable() so the slightly 1032 * more expensive save operation can be avoided. 1033 */ 1034 static inline void bpf_disable_instrumentation(void) 1035 { 1036 migrate_disable(); 1037 if (IS_ENABLED(CONFIG_PREEMPT_RT)) 1038 this_cpu_inc(bpf_prog_active); 1039 else 1040 __this_cpu_inc(bpf_prog_active); 1041 } 1042 1043 static inline void bpf_enable_instrumentation(void) 1044 { 1045 if (IS_ENABLED(CONFIG_PREEMPT_RT)) 1046 this_cpu_dec(bpf_prog_active); 1047 else 1048 __this_cpu_dec(bpf_prog_active); 1049 migrate_enable(); 1050 } 1051 1052 extern const struct file_operations bpf_map_fops; 1053 extern const struct file_operations bpf_prog_fops; 1054 extern const struct file_operations bpf_iter_fops; 1055 1056 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \ 1057 extern const struct bpf_prog_ops _name ## _prog_ops; \ 1058 extern const struct bpf_verifier_ops _name ## _verifier_ops; 1059 #define BPF_MAP_TYPE(_id, _ops) \ 1060 extern const struct bpf_map_ops _ops; 1061 #define BPF_LINK_TYPE(_id, _name) 1062 #include <linux/bpf_types.h> 1063 #undef BPF_PROG_TYPE 1064 #undef BPF_MAP_TYPE 1065 #undef BPF_LINK_TYPE 1066 1067 extern const struct bpf_prog_ops bpf_offload_prog_ops; 1068 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops; 1069 extern const struct bpf_verifier_ops xdp_analyzer_ops; 1070 1071 struct bpf_prog *bpf_prog_get(u32 ufd); 1072 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, 1073 bool attach_drv); 1074 void bpf_prog_add(struct bpf_prog *prog, int i); 1075 void bpf_prog_sub(struct bpf_prog *prog, int i); 1076 void bpf_prog_inc(struct bpf_prog *prog); 1077 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog); 1078 void bpf_prog_put(struct bpf_prog *prog); 1079 int __bpf_prog_charge(struct user_struct *user, u32 pages); 1080 void __bpf_prog_uncharge(struct user_struct *user, u32 pages); 1081 void __bpf_free_used_maps(struct bpf_prog_aux *aux, 1082 struct bpf_map **used_maps, u32 len); 1083 1084 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock); 1085 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock); 1086 1087 struct bpf_map *bpf_map_get(u32 ufd); 1088 struct bpf_map *bpf_map_get_with_uref(u32 ufd); 1089 struct bpf_map *__bpf_map_get(struct fd f); 1090 void bpf_map_inc(struct bpf_map *map); 1091 void bpf_map_inc_with_uref(struct bpf_map *map); 1092 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map); 1093 void bpf_map_put_with_uref(struct bpf_map *map); 1094 void bpf_map_put(struct bpf_map *map); 1095 int bpf_map_charge_memlock(struct bpf_map *map, u32 pages); 1096 void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages); 1097 int bpf_map_charge_init(struct bpf_map_memory *mem, u64 size); 1098 void bpf_map_charge_finish(struct bpf_map_memory *mem); 1099 void bpf_map_charge_move(struct bpf_map_memory *dst, 1100 struct bpf_map_memory *src); 1101 void *bpf_map_area_alloc(u64 size, int numa_node); 1102 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node); 1103 void bpf_map_area_free(void *base); 1104 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr); 1105 int generic_map_lookup_batch(struct bpf_map *map, 1106 const union bpf_attr *attr, 1107 union bpf_attr __user *uattr); 1108 int generic_map_update_batch(struct bpf_map *map, 1109 const union bpf_attr *attr, 1110 union bpf_attr __user *uattr); 1111 int generic_map_delete_batch(struct bpf_map *map, 1112 const union bpf_attr *attr, 1113 union bpf_attr __user *uattr); 1114 struct bpf_map *bpf_map_get_curr_or_next(u32 *id); 1115 1116 extern int sysctl_unprivileged_bpf_disabled; 1117 1118 static inline bool bpf_allow_ptr_leaks(void) 1119 { 1120 return perfmon_capable(); 1121 } 1122 1123 static inline bool bpf_allow_ptr_to_map_access(void) 1124 { 1125 return perfmon_capable(); 1126 } 1127 1128 static inline bool bpf_bypass_spec_v1(void) 1129 { 1130 return perfmon_capable(); 1131 } 1132 1133 static inline bool bpf_bypass_spec_v4(void) 1134 { 1135 return perfmon_capable(); 1136 } 1137 1138 int bpf_map_new_fd(struct bpf_map *map, int flags); 1139 int bpf_prog_new_fd(struct bpf_prog *prog); 1140 1141 struct bpf_link { 1142 atomic64_t refcnt; 1143 u32 id; 1144 enum bpf_link_type type; 1145 const struct bpf_link_ops *ops; 1146 struct bpf_prog *prog; 1147 struct work_struct work; 1148 }; 1149 1150 struct bpf_link_primer { 1151 struct bpf_link *link; 1152 struct file *file; 1153 int fd; 1154 u32 id; 1155 }; 1156 1157 struct bpf_link_ops { 1158 void (*release)(struct bpf_link *link); 1159 void (*dealloc)(struct bpf_link *link); 1160 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog, 1161 struct bpf_prog *old_prog); 1162 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq); 1163 int (*fill_link_info)(const struct bpf_link *link, 1164 struct bpf_link_info *info); 1165 }; 1166 1167 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type, 1168 const struct bpf_link_ops *ops, struct bpf_prog *prog); 1169 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer); 1170 int bpf_link_settle(struct bpf_link_primer *primer); 1171 void bpf_link_cleanup(struct bpf_link_primer *primer); 1172 void bpf_link_inc(struct bpf_link *link); 1173 void bpf_link_put(struct bpf_link *link); 1174 int bpf_link_new_fd(struct bpf_link *link); 1175 struct file *bpf_link_new_file(struct bpf_link *link, int *reserved_fd); 1176 struct bpf_link *bpf_link_get_from_fd(u32 ufd); 1177 1178 int bpf_obj_pin_user(u32 ufd, const char __user *pathname); 1179 int bpf_obj_get_user(const char __user *pathname, int flags); 1180 1181 #define BPF_ITER_FUNC_PREFIX "bpf_iter_" 1182 #define DEFINE_BPF_ITER_FUNC(target, args...) \ 1183 extern int bpf_iter_ ## target(args); \ 1184 int __init bpf_iter_ ## target(args) { return 0; } 1185 1186 typedef int (*bpf_iter_init_seq_priv_t)(void *private_data); 1187 typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data); 1188 1189 #define BPF_ITER_CTX_ARG_MAX 2 1190 struct bpf_iter_reg { 1191 const char *target; 1192 const struct seq_operations *seq_ops; 1193 bpf_iter_init_seq_priv_t init_seq_private; 1194 bpf_iter_fini_seq_priv_t fini_seq_private; 1195 u32 seq_priv_size; 1196 u32 ctx_arg_info_size; 1197 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX]; 1198 }; 1199 1200 struct bpf_iter_meta { 1201 __bpf_md_ptr(struct seq_file *, seq); 1202 u64 session_id; 1203 u64 seq_num; 1204 }; 1205 1206 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info); 1207 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info); 1208 bool bpf_iter_prog_supported(struct bpf_prog *prog); 1209 int bpf_iter_link_attach(const union bpf_attr *attr, struct bpf_prog *prog); 1210 int bpf_iter_new_fd(struct bpf_link *link); 1211 bool bpf_link_is_iter(struct bpf_link *link); 1212 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop); 1213 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx); 1214 1215 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value); 1216 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value); 1217 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value, 1218 u64 flags); 1219 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value, 1220 u64 flags); 1221 1222 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value); 1223 1224 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file, 1225 void *key, void *value, u64 map_flags); 1226 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 1227 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file, 1228 void *key, void *value, u64 map_flags); 1229 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 1230 1231 int bpf_get_file_flag(int flags); 1232 int bpf_check_uarg_tail_zero(void __user *uaddr, size_t expected_size, 1233 size_t actual_size); 1234 1235 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and 1236 * forced to use 'long' read/writes to try to atomically copy long counters. 1237 * Best-effort only. No barriers here, since it _will_ race with concurrent 1238 * updates from BPF programs. Called from bpf syscall and mostly used with 1239 * size 8 or 16 bytes, so ask compiler to inline it. 1240 */ 1241 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size) 1242 { 1243 const long *lsrc = src; 1244 long *ldst = dst; 1245 1246 size /= sizeof(long); 1247 while (size--) 1248 *ldst++ = *lsrc++; 1249 } 1250 1251 /* verify correctness of eBPF program */ 1252 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, 1253 union bpf_attr __user *uattr); 1254 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth); 1255 1256 /* Map specifics */ 1257 struct xdp_buff; 1258 struct sk_buff; 1259 1260 struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key); 1261 struct bpf_dtab_netdev *__dev_map_hash_lookup_elem(struct bpf_map *map, u32 key); 1262 void __dev_flush(void); 1263 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp, 1264 struct net_device *dev_rx); 1265 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, 1266 struct net_device *dev_rx); 1267 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb, 1268 struct bpf_prog *xdp_prog); 1269 bool dev_map_can_have_prog(struct bpf_map *map); 1270 1271 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key); 1272 void __cpu_map_flush(void); 1273 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp, 1274 struct net_device *dev_rx); 1275 1276 /* Return map's numa specified by userspace */ 1277 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr) 1278 { 1279 return (attr->map_flags & BPF_F_NUMA_NODE) ? 1280 attr->numa_node : NUMA_NO_NODE; 1281 } 1282 1283 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type); 1284 int array_map_alloc_check(union bpf_attr *attr); 1285 1286 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, 1287 union bpf_attr __user *uattr); 1288 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, 1289 union bpf_attr __user *uattr); 1290 int bpf_prog_test_run_tracing(struct bpf_prog *prog, 1291 const union bpf_attr *kattr, 1292 union bpf_attr __user *uattr); 1293 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, 1294 const union bpf_attr *kattr, 1295 union bpf_attr __user *uattr); 1296 bool btf_ctx_access(int off, int size, enum bpf_access_type type, 1297 const struct bpf_prog *prog, 1298 struct bpf_insn_access_aux *info); 1299 int btf_struct_access(struct bpf_verifier_log *log, 1300 const struct btf_type *t, int off, int size, 1301 enum bpf_access_type atype, 1302 u32 *next_btf_id); 1303 int btf_resolve_helper_id(struct bpf_verifier_log *log, 1304 const struct bpf_func_proto *fn, int); 1305 1306 int btf_distill_func_proto(struct bpf_verifier_log *log, 1307 struct btf *btf, 1308 const struct btf_type *func_proto, 1309 const char *func_name, 1310 struct btf_func_model *m); 1311 1312 struct bpf_reg_state; 1313 int btf_check_func_arg_match(struct bpf_verifier_env *env, int subprog, 1314 struct bpf_reg_state *regs); 1315 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog, 1316 struct bpf_reg_state *reg); 1317 int btf_check_type_match(struct bpf_verifier_env *env, struct bpf_prog *prog, 1318 struct btf *btf, const struct btf_type *t); 1319 1320 struct bpf_prog *bpf_prog_by_id(u32 id); 1321 1322 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id); 1323 #else /* !CONFIG_BPF_SYSCALL */ 1324 static inline struct bpf_prog *bpf_prog_get(u32 ufd) 1325 { 1326 return ERR_PTR(-EOPNOTSUPP); 1327 } 1328 1329 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, 1330 enum bpf_prog_type type, 1331 bool attach_drv) 1332 { 1333 return ERR_PTR(-EOPNOTSUPP); 1334 } 1335 1336 static inline void bpf_prog_add(struct bpf_prog *prog, int i) 1337 { 1338 } 1339 1340 static inline void bpf_prog_sub(struct bpf_prog *prog, int i) 1341 { 1342 } 1343 1344 static inline void bpf_prog_put(struct bpf_prog *prog) 1345 { 1346 } 1347 1348 static inline void bpf_prog_inc(struct bpf_prog *prog) 1349 { 1350 } 1351 1352 static inline struct bpf_prog *__must_check 1353 bpf_prog_inc_not_zero(struct bpf_prog *prog) 1354 { 1355 return ERR_PTR(-EOPNOTSUPP); 1356 } 1357 1358 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages) 1359 { 1360 return 0; 1361 } 1362 1363 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages) 1364 { 1365 } 1366 1367 static inline int bpf_obj_get_user(const char __user *pathname, int flags) 1368 { 1369 return -EOPNOTSUPP; 1370 } 1371 1372 static inline struct net_device *__dev_map_lookup_elem(struct bpf_map *map, 1373 u32 key) 1374 { 1375 return NULL; 1376 } 1377 1378 static inline struct net_device *__dev_map_hash_lookup_elem(struct bpf_map *map, 1379 u32 key) 1380 { 1381 return NULL; 1382 } 1383 static inline bool dev_map_can_have_prog(struct bpf_map *map) 1384 { 1385 return false; 1386 } 1387 1388 static inline void __dev_flush(void) 1389 { 1390 } 1391 1392 struct xdp_buff; 1393 struct bpf_dtab_netdev; 1394 1395 static inline 1396 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp, 1397 struct net_device *dev_rx) 1398 { 1399 return 0; 1400 } 1401 1402 static inline 1403 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, 1404 struct net_device *dev_rx) 1405 { 1406 return 0; 1407 } 1408 1409 struct sk_buff; 1410 1411 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, 1412 struct sk_buff *skb, 1413 struct bpf_prog *xdp_prog) 1414 { 1415 return 0; 1416 } 1417 1418 static inline 1419 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key) 1420 { 1421 return NULL; 1422 } 1423 1424 static inline void __cpu_map_flush(void) 1425 { 1426 } 1427 1428 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, 1429 struct xdp_buff *xdp, 1430 struct net_device *dev_rx) 1431 { 1432 return 0; 1433 } 1434 1435 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name, 1436 enum bpf_prog_type type) 1437 { 1438 return ERR_PTR(-EOPNOTSUPP); 1439 } 1440 1441 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog, 1442 const union bpf_attr *kattr, 1443 union bpf_attr __user *uattr) 1444 { 1445 return -ENOTSUPP; 1446 } 1447 1448 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog, 1449 const union bpf_attr *kattr, 1450 union bpf_attr __user *uattr) 1451 { 1452 return -ENOTSUPP; 1453 } 1454 1455 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog, 1456 const union bpf_attr *kattr, 1457 union bpf_attr __user *uattr) 1458 { 1459 return -ENOTSUPP; 1460 } 1461 1462 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, 1463 const union bpf_attr *kattr, 1464 union bpf_attr __user *uattr) 1465 { 1466 return -ENOTSUPP; 1467 } 1468 1469 static inline void bpf_map_put(struct bpf_map *map) 1470 { 1471 } 1472 1473 static inline struct bpf_prog *bpf_prog_by_id(u32 id) 1474 { 1475 return ERR_PTR(-ENOTSUPP); 1476 } 1477 1478 static inline const struct bpf_func_proto * 1479 bpf_base_func_proto(enum bpf_func_id func_id) 1480 { 1481 return NULL; 1482 } 1483 #endif /* CONFIG_BPF_SYSCALL */ 1484 1485 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd, 1486 enum bpf_prog_type type) 1487 { 1488 return bpf_prog_get_type_dev(ufd, type, false); 1489 } 1490 1491 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool); 1492 1493 int bpf_prog_offload_compile(struct bpf_prog *prog); 1494 void bpf_prog_offload_destroy(struct bpf_prog *prog); 1495 int bpf_prog_offload_info_fill(struct bpf_prog_info *info, 1496 struct bpf_prog *prog); 1497 1498 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map); 1499 1500 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value); 1501 int bpf_map_offload_update_elem(struct bpf_map *map, 1502 void *key, void *value, u64 flags); 1503 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key); 1504 int bpf_map_offload_get_next_key(struct bpf_map *map, 1505 void *key, void *next_key); 1506 1507 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map); 1508 1509 struct bpf_offload_dev * 1510 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv); 1511 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev); 1512 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev); 1513 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev, 1514 struct net_device *netdev); 1515 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev, 1516 struct net_device *netdev); 1517 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev); 1518 1519 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL) 1520 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr); 1521 1522 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux) 1523 { 1524 return aux->offload_requested; 1525 } 1526 1527 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 1528 { 1529 return unlikely(map->ops == &bpf_map_offload_ops); 1530 } 1531 1532 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr); 1533 void bpf_map_offload_map_free(struct bpf_map *map); 1534 void init_btf_sock_ids(struct btf *btf); 1535 #else 1536 static inline int bpf_prog_offload_init(struct bpf_prog *prog, 1537 union bpf_attr *attr) 1538 { 1539 return -EOPNOTSUPP; 1540 } 1541 1542 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux) 1543 { 1544 return false; 1545 } 1546 1547 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 1548 { 1549 return false; 1550 } 1551 1552 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr) 1553 { 1554 return ERR_PTR(-EOPNOTSUPP); 1555 } 1556 1557 static inline void bpf_map_offload_map_free(struct bpf_map *map) 1558 { 1559 } 1560 static inline void init_btf_sock_ids(struct btf *btf) 1561 { 1562 } 1563 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */ 1564 1565 #if defined(CONFIG_BPF_STREAM_PARSER) 1566 int sock_map_prog_update(struct bpf_map *map, struct bpf_prog *prog, 1567 struct bpf_prog *old, u32 which); 1568 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog); 1569 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype); 1570 void sock_map_unhash(struct sock *sk); 1571 void sock_map_close(struct sock *sk, long timeout); 1572 #else 1573 static inline int sock_map_prog_update(struct bpf_map *map, 1574 struct bpf_prog *prog, 1575 struct bpf_prog *old, u32 which) 1576 { 1577 return -EOPNOTSUPP; 1578 } 1579 1580 static inline int sock_map_get_from_fd(const union bpf_attr *attr, 1581 struct bpf_prog *prog) 1582 { 1583 return -EINVAL; 1584 } 1585 1586 static inline int sock_map_prog_detach(const union bpf_attr *attr, 1587 enum bpf_prog_type ptype) 1588 { 1589 return -EOPNOTSUPP; 1590 } 1591 #endif /* CONFIG_BPF_STREAM_PARSER */ 1592 1593 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) 1594 void bpf_sk_reuseport_detach(struct sock *sk); 1595 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key, 1596 void *value); 1597 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key, 1598 void *value, u64 map_flags); 1599 #else 1600 static inline void bpf_sk_reuseport_detach(struct sock *sk) 1601 { 1602 } 1603 1604 #ifdef CONFIG_BPF_SYSCALL 1605 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, 1606 void *key, void *value) 1607 { 1608 return -EOPNOTSUPP; 1609 } 1610 1611 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, 1612 void *key, void *value, 1613 u64 map_flags) 1614 { 1615 return -EOPNOTSUPP; 1616 } 1617 #endif /* CONFIG_BPF_SYSCALL */ 1618 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */ 1619 1620 /* verifier prototypes for helper functions called from eBPF programs */ 1621 extern const struct bpf_func_proto bpf_map_lookup_elem_proto; 1622 extern const struct bpf_func_proto bpf_map_update_elem_proto; 1623 extern const struct bpf_func_proto bpf_map_delete_elem_proto; 1624 extern const struct bpf_func_proto bpf_map_push_elem_proto; 1625 extern const struct bpf_func_proto bpf_map_pop_elem_proto; 1626 extern const struct bpf_func_proto bpf_map_peek_elem_proto; 1627 1628 extern const struct bpf_func_proto bpf_get_prandom_u32_proto; 1629 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto; 1630 extern const struct bpf_func_proto bpf_get_numa_node_id_proto; 1631 extern const struct bpf_func_proto bpf_tail_call_proto; 1632 extern const struct bpf_func_proto bpf_ktime_get_ns_proto; 1633 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto; 1634 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto; 1635 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto; 1636 extern const struct bpf_func_proto bpf_get_current_comm_proto; 1637 extern const struct bpf_func_proto bpf_get_stackid_proto; 1638 extern const struct bpf_func_proto bpf_get_stack_proto; 1639 extern const struct bpf_func_proto bpf_get_task_stack_proto; 1640 extern const struct bpf_func_proto bpf_sock_map_update_proto; 1641 extern const struct bpf_func_proto bpf_sock_hash_update_proto; 1642 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto; 1643 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto; 1644 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto; 1645 extern const struct bpf_func_proto bpf_msg_redirect_map_proto; 1646 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto; 1647 extern const struct bpf_func_proto bpf_sk_redirect_map_proto; 1648 extern const struct bpf_func_proto bpf_spin_lock_proto; 1649 extern const struct bpf_func_proto bpf_spin_unlock_proto; 1650 extern const struct bpf_func_proto bpf_get_local_storage_proto; 1651 extern const struct bpf_func_proto bpf_strtol_proto; 1652 extern const struct bpf_func_proto bpf_strtoul_proto; 1653 extern const struct bpf_func_proto bpf_tcp_sock_proto; 1654 extern const struct bpf_func_proto bpf_jiffies64_proto; 1655 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto; 1656 extern const struct bpf_func_proto bpf_event_output_data_proto; 1657 extern const struct bpf_func_proto bpf_ringbuf_output_proto; 1658 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto; 1659 extern const struct bpf_func_proto bpf_ringbuf_submit_proto; 1660 extern const struct bpf_func_proto bpf_ringbuf_discard_proto; 1661 extern const struct bpf_func_proto bpf_ringbuf_query_proto; 1662 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto; 1663 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto; 1664 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto; 1665 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto; 1666 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto; 1667 1668 const struct bpf_func_proto *bpf_tracing_func_proto( 1669 enum bpf_func_id func_id, const struct bpf_prog *prog); 1670 1671 const struct bpf_func_proto *tracing_prog_func_proto( 1672 enum bpf_func_id func_id, const struct bpf_prog *prog); 1673 1674 /* Shared helpers among cBPF and eBPF. */ 1675 void bpf_user_rnd_init_once(void); 1676 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 1677 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 1678 1679 #if defined(CONFIG_NET) 1680 bool bpf_sock_common_is_valid_access(int off, int size, 1681 enum bpf_access_type type, 1682 struct bpf_insn_access_aux *info); 1683 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type, 1684 struct bpf_insn_access_aux *info); 1685 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 1686 const struct bpf_insn *si, 1687 struct bpf_insn *insn_buf, 1688 struct bpf_prog *prog, 1689 u32 *target_size); 1690 #else 1691 static inline bool bpf_sock_common_is_valid_access(int off, int size, 1692 enum bpf_access_type type, 1693 struct bpf_insn_access_aux *info) 1694 { 1695 return false; 1696 } 1697 static inline bool bpf_sock_is_valid_access(int off, int size, 1698 enum bpf_access_type type, 1699 struct bpf_insn_access_aux *info) 1700 { 1701 return false; 1702 } 1703 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 1704 const struct bpf_insn *si, 1705 struct bpf_insn *insn_buf, 1706 struct bpf_prog *prog, 1707 u32 *target_size) 1708 { 1709 return 0; 1710 } 1711 #endif 1712 1713 #ifdef CONFIG_INET 1714 struct sk_reuseport_kern { 1715 struct sk_buff *skb; 1716 struct sock *sk; 1717 struct sock *selected_sk; 1718 void *data_end; 1719 u32 hash; 1720 u32 reuseport_id; 1721 bool bind_inany; 1722 }; 1723 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 1724 struct bpf_insn_access_aux *info); 1725 1726 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, 1727 const struct bpf_insn *si, 1728 struct bpf_insn *insn_buf, 1729 struct bpf_prog *prog, 1730 u32 *target_size); 1731 1732 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 1733 struct bpf_insn_access_aux *info); 1734 1735 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, 1736 const struct bpf_insn *si, 1737 struct bpf_insn *insn_buf, 1738 struct bpf_prog *prog, 1739 u32 *target_size); 1740 #else 1741 static inline bool bpf_tcp_sock_is_valid_access(int off, int size, 1742 enum bpf_access_type type, 1743 struct bpf_insn_access_aux *info) 1744 { 1745 return false; 1746 } 1747 1748 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, 1749 const struct bpf_insn *si, 1750 struct bpf_insn *insn_buf, 1751 struct bpf_prog *prog, 1752 u32 *target_size) 1753 { 1754 return 0; 1755 } 1756 static inline bool bpf_xdp_sock_is_valid_access(int off, int size, 1757 enum bpf_access_type type, 1758 struct bpf_insn_access_aux *info) 1759 { 1760 return false; 1761 } 1762 1763 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, 1764 const struct bpf_insn *si, 1765 struct bpf_insn *insn_buf, 1766 struct bpf_prog *prog, 1767 u32 *target_size) 1768 { 1769 return 0; 1770 } 1771 #endif /* CONFIG_INET */ 1772 1773 enum bpf_text_poke_type { 1774 BPF_MOD_CALL, 1775 BPF_MOD_JUMP, 1776 }; 1777 1778 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t, 1779 void *addr1, void *addr2); 1780 1781 #endif /* _LINUX_BPF_H */ 1782