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