1 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com 2 * 3 * This program is free software; you can redistribute it and/or 4 * modify it under the terms of version 2 of the GNU General Public 5 * License as published by the Free Software Foundation. 6 */ 7 #ifndef _LINUX_BPF_H 8 #define _LINUX_BPF_H 1 9 10 #include <uapi/linux/bpf.h> 11 12 #include <linux/workqueue.h> 13 #include <linux/file.h> 14 #include <linux/percpu.h> 15 #include <linux/err.h> 16 #include <linux/rbtree_latch.h> 17 #include <linux/numa.h> 18 #include <linux/wait.h> 19 20 struct bpf_verifier_env; 21 struct perf_event; 22 struct bpf_prog; 23 struct bpf_map; 24 struct sock; 25 struct seq_file; 26 struct btf; 27 28 /* map is generic key/value storage optionally accesible by eBPF programs */ 29 struct bpf_map_ops { 30 /* funcs callable from userspace (via syscall) */ 31 int (*map_alloc_check)(union bpf_attr *attr); 32 struct bpf_map *(*map_alloc)(union bpf_attr *attr); 33 void (*map_release)(struct bpf_map *map, struct file *map_file); 34 void (*map_free)(struct bpf_map *map); 35 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key); 36 void (*map_release_uref)(struct bpf_map *map); 37 38 /* funcs callable from userspace and from eBPF programs */ 39 void *(*map_lookup_elem)(struct bpf_map *map, void *key); 40 int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags); 41 int (*map_delete_elem)(struct bpf_map *map, void *key); 42 43 /* funcs called by prog_array and perf_event_array map */ 44 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file, 45 int fd); 46 void (*map_fd_put_ptr)(void *ptr); 47 u32 (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf); 48 u32 (*map_fd_sys_lookup_elem)(void *ptr); 49 void (*map_seq_show_elem)(struct bpf_map *map, void *key, 50 struct seq_file *m); 51 int (*map_check_btf)(const struct bpf_map *map, const struct btf *btf, 52 u32 key_type_id, u32 value_type_id); 53 }; 54 55 struct bpf_map { 56 /* The first two cachelines with read-mostly members of which some 57 * are also accessed in fast-path (e.g. ops, max_entries). 58 */ 59 const struct bpf_map_ops *ops ____cacheline_aligned; 60 struct bpf_map *inner_map_meta; 61 #ifdef CONFIG_SECURITY 62 void *security; 63 #endif 64 enum bpf_map_type map_type; 65 u32 key_size; 66 u32 value_size; 67 u32 max_entries; 68 u32 map_flags; 69 u32 pages; 70 u32 id; 71 int numa_node; 72 u32 btf_key_type_id; 73 u32 btf_value_type_id; 74 struct btf *btf; 75 bool unpriv_array; 76 /* 55 bytes hole */ 77 78 /* The 3rd and 4th cacheline with misc members to avoid false sharing 79 * particularly with refcounting. 80 */ 81 struct user_struct *user ____cacheline_aligned; 82 atomic_t refcnt; 83 atomic_t usercnt; 84 struct work_struct work; 85 char name[BPF_OBJ_NAME_LEN]; 86 }; 87 88 struct bpf_offload_dev; 89 struct bpf_offloaded_map; 90 91 struct bpf_map_dev_ops { 92 int (*map_get_next_key)(struct bpf_offloaded_map *map, 93 void *key, void *next_key); 94 int (*map_lookup_elem)(struct bpf_offloaded_map *map, 95 void *key, void *value); 96 int (*map_update_elem)(struct bpf_offloaded_map *map, 97 void *key, void *value, u64 flags); 98 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key); 99 }; 100 101 struct bpf_offloaded_map { 102 struct bpf_map map; 103 struct net_device *netdev; 104 const struct bpf_map_dev_ops *dev_ops; 105 void *dev_priv; 106 struct list_head offloads; 107 }; 108 109 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map) 110 { 111 return container_of(map, struct bpf_offloaded_map, map); 112 } 113 114 static inline bool bpf_map_offload_neutral(const struct bpf_map *map) 115 { 116 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY; 117 } 118 119 static inline bool bpf_map_support_seq_show(const struct bpf_map *map) 120 { 121 return map->ops->map_seq_show_elem && map->ops->map_check_btf; 122 } 123 124 extern const struct bpf_map_ops bpf_map_offload_ops; 125 126 /* function argument constraints */ 127 enum bpf_arg_type { 128 ARG_DONTCARE = 0, /* unused argument in helper function */ 129 130 /* the following constraints used to prototype 131 * bpf_map_lookup/update/delete_elem() functions 132 */ 133 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */ 134 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */ 135 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */ 136 137 /* the following constraints used to prototype bpf_memcmp() and other 138 * functions that access data on eBPF program stack 139 */ 140 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */ 141 ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */ 142 ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized, 143 * helper function must fill all bytes or clear 144 * them in error case. 145 */ 146 147 ARG_CONST_SIZE, /* number of bytes accessed from memory */ 148 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */ 149 150 ARG_PTR_TO_CTX, /* pointer to context */ 151 ARG_ANYTHING, /* any (initialized) argument is ok */ 152 }; 153 154 /* type of values returned from helper functions */ 155 enum bpf_return_type { 156 RET_INTEGER, /* function returns integer */ 157 RET_VOID, /* function doesn't return anything */ 158 RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */ 159 }; 160 161 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs 162 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL 163 * instructions after verifying 164 */ 165 struct bpf_func_proto { 166 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 167 bool gpl_only; 168 bool pkt_access; 169 enum bpf_return_type ret_type; 170 enum bpf_arg_type arg1_type; 171 enum bpf_arg_type arg2_type; 172 enum bpf_arg_type arg3_type; 173 enum bpf_arg_type arg4_type; 174 enum bpf_arg_type arg5_type; 175 }; 176 177 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is 178 * the first argument to eBPF programs. 179 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *' 180 */ 181 struct bpf_context; 182 183 enum bpf_access_type { 184 BPF_READ = 1, 185 BPF_WRITE = 2 186 }; 187 188 /* types of values stored in eBPF registers */ 189 /* Pointer types represent: 190 * pointer 191 * pointer + imm 192 * pointer + (u16) var 193 * pointer + (u16) var + imm 194 * if (range > 0) then [ptr, ptr + range - off) is safe to access 195 * if (id > 0) means that some 'var' was added 196 * if (off > 0) means that 'imm' was added 197 */ 198 enum bpf_reg_type { 199 NOT_INIT = 0, /* nothing was written into register */ 200 SCALAR_VALUE, /* reg doesn't contain a valid pointer */ 201 PTR_TO_CTX, /* reg points to bpf_context */ 202 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */ 203 PTR_TO_MAP_VALUE, /* reg points to map element value */ 204 PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */ 205 PTR_TO_STACK, /* reg == frame_pointer + offset */ 206 PTR_TO_PACKET_META, /* skb->data - meta_len */ 207 PTR_TO_PACKET, /* reg points to skb->data */ 208 PTR_TO_PACKET_END, /* skb->data + headlen */ 209 }; 210 211 /* The information passed from prog-specific *_is_valid_access 212 * back to the verifier. 213 */ 214 struct bpf_insn_access_aux { 215 enum bpf_reg_type reg_type; 216 int ctx_field_size; 217 }; 218 219 static inline void 220 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size) 221 { 222 aux->ctx_field_size = size; 223 } 224 225 struct bpf_prog_ops { 226 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr, 227 union bpf_attr __user *uattr); 228 }; 229 230 struct bpf_verifier_ops { 231 /* return eBPF function prototype for verification */ 232 const struct bpf_func_proto * 233 (*get_func_proto)(enum bpf_func_id func_id, 234 const struct bpf_prog *prog); 235 236 /* return true if 'size' wide access at offset 'off' within bpf_context 237 * with 'type' (read or write) is allowed 238 */ 239 bool (*is_valid_access)(int off, int size, enum bpf_access_type type, 240 const struct bpf_prog *prog, 241 struct bpf_insn_access_aux *info); 242 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write, 243 const struct bpf_prog *prog); 244 int (*gen_ld_abs)(const struct bpf_insn *orig, 245 struct bpf_insn *insn_buf); 246 u32 (*convert_ctx_access)(enum bpf_access_type type, 247 const struct bpf_insn *src, 248 struct bpf_insn *dst, 249 struct bpf_prog *prog, u32 *target_size); 250 }; 251 252 struct bpf_prog_offload_ops { 253 int (*insn_hook)(struct bpf_verifier_env *env, 254 int insn_idx, int prev_insn_idx); 255 }; 256 257 struct bpf_prog_offload { 258 struct bpf_prog *prog; 259 struct net_device *netdev; 260 void *dev_priv; 261 struct list_head offloads; 262 bool dev_state; 263 const struct bpf_prog_offload_ops *dev_ops; 264 void *jited_image; 265 u32 jited_len; 266 }; 267 268 struct bpf_prog_aux { 269 atomic_t refcnt; 270 u32 used_map_cnt; 271 u32 max_ctx_offset; 272 u32 stack_depth; 273 u32 id; 274 u32 func_cnt; 275 bool offload_requested; 276 struct bpf_prog **func; 277 void *jit_data; /* JIT specific data. arch dependent */ 278 struct latch_tree_node ksym_tnode; 279 struct list_head ksym_lnode; 280 const struct bpf_prog_ops *ops; 281 struct bpf_map **used_maps; 282 struct bpf_prog *prog; 283 struct user_struct *user; 284 u64 load_time; /* ns since boottime */ 285 char name[BPF_OBJ_NAME_LEN]; 286 #ifdef CONFIG_SECURITY 287 void *security; 288 #endif 289 struct bpf_prog_offload *offload; 290 union { 291 struct work_struct work; 292 struct rcu_head rcu; 293 }; 294 }; 295 296 struct bpf_array { 297 struct bpf_map map; 298 u32 elem_size; 299 u32 index_mask; 300 /* 'ownership' of prog_array is claimed by the first program that 301 * is going to use this map or by the first program which FD is stored 302 * in the map to make sure that all callers and callees have the same 303 * prog_type and JITed flag 304 */ 305 enum bpf_prog_type owner_prog_type; 306 bool owner_jited; 307 union { 308 char value[0] __aligned(8); 309 void *ptrs[0] __aligned(8); 310 void __percpu *pptrs[0] __aligned(8); 311 }; 312 }; 313 314 #define MAX_TAIL_CALL_CNT 32 315 316 struct bpf_event_entry { 317 struct perf_event *event; 318 struct file *perf_file; 319 struct file *map_file; 320 struct rcu_head rcu; 321 }; 322 323 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp); 324 int bpf_prog_calc_tag(struct bpf_prog *fp); 325 326 const struct bpf_func_proto *bpf_get_trace_printk_proto(void); 327 328 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src, 329 unsigned long off, unsigned long len); 330 331 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, 332 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy); 333 334 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, 335 union bpf_attr __user *uattr); 336 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, 337 union bpf_attr __user *uattr); 338 339 /* an array of programs to be executed under rcu_lock. 340 * 341 * Typical usage: 342 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN); 343 * 344 * the structure returned by bpf_prog_array_alloc() should be populated 345 * with program pointers and the last pointer must be NULL. 346 * The user has to keep refcnt on the program and make sure the program 347 * is removed from the array before bpf_prog_put(). 348 * The 'struct bpf_prog_array *' should only be replaced with xchg() 349 * since other cpus are walking the array of pointers in parallel. 350 */ 351 struct bpf_prog_array { 352 struct rcu_head rcu; 353 struct bpf_prog *progs[0]; 354 }; 355 356 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags); 357 void bpf_prog_array_free(struct bpf_prog_array __rcu *progs); 358 int bpf_prog_array_length(struct bpf_prog_array __rcu *progs); 359 int bpf_prog_array_copy_to_user(struct bpf_prog_array __rcu *progs, 360 __u32 __user *prog_ids, u32 cnt); 361 362 void bpf_prog_array_delete_safe(struct bpf_prog_array __rcu *progs, 363 struct bpf_prog *old_prog); 364 int bpf_prog_array_copy_info(struct bpf_prog_array __rcu *array, 365 u32 *prog_ids, u32 request_cnt, 366 u32 *prog_cnt); 367 int bpf_prog_array_copy(struct bpf_prog_array __rcu *old_array, 368 struct bpf_prog *exclude_prog, 369 struct bpf_prog *include_prog, 370 struct bpf_prog_array **new_array); 371 372 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null) \ 373 ({ \ 374 struct bpf_prog **_prog, *__prog; \ 375 struct bpf_prog_array *_array; \ 376 u32 _ret = 1; \ 377 preempt_disable(); \ 378 rcu_read_lock(); \ 379 _array = rcu_dereference(array); \ 380 if (unlikely(check_non_null && !_array))\ 381 goto _out; \ 382 _prog = _array->progs; \ 383 while ((__prog = READ_ONCE(*_prog))) { \ 384 _ret &= func(__prog, ctx); \ 385 _prog++; \ 386 } \ 387 _out: \ 388 rcu_read_unlock(); \ 389 preempt_enable_no_resched(); \ 390 _ret; \ 391 }) 392 393 #define BPF_PROG_RUN_ARRAY(array, ctx, func) \ 394 __BPF_PROG_RUN_ARRAY(array, ctx, func, false) 395 396 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \ 397 __BPF_PROG_RUN_ARRAY(array, ctx, func, true) 398 399 #ifdef CONFIG_BPF_SYSCALL 400 DECLARE_PER_CPU(int, bpf_prog_active); 401 402 extern const struct file_operations bpf_map_fops; 403 extern const struct file_operations bpf_prog_fops; 404 405 #define BPF_PROG_TYPE(_id, _name) \ 406 extern const struct bpf_prog_ops _name ## _prog_ops; \ 407 extern const struct bpf_verifier_ops _name ## _verifier_ops; 408 #define BPF_MAP_TYPE(_id, _ops) \ 409 extern const struct bpf_map_ops _ops; 410 #include <linux/bpf_types.h> 411 #undef BPF_PROG_TYPE 412 #undef BPF_MAP_TYPE 413 414 extern const struct bpf_prog_ops bpf_offload_prog_ops; 415 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops; 416 extern const struct bpf_verifier_ops xdp_analyzer_ops; 417 418 struct bpf_prog *bpf_prog_get(u32 ufd); 419 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, 420 bool attach_drv); 421 struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, int i); 422 void bpf_prog_sub(struct bpf_prog *prog, int i); 423 struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog); 424 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog); 425 void bpf_prog_put(struct bpf_prog *prog); 426 int __bpf_prog_charge(struct user_struct *user, u32 pages); 427 void __bpf_prog_uncharge(struct user_struct *user, u32 pages); 428 429 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock); 430 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock); 431 432 struct bpf_map *bpf_map_get_with_uref(u32 ufd); 433 struct bpf_map *__bpf_map_get(struct fd f); 434 struct bpf_map * __must_check bpf_map_inc(struct bpf_map *map, bool uref); 435 void bpf_map_put_with_uref(struct bpf_map *map); 436 void bpf_map_put(struct bpf_map *map); 437 int bpf_map_precharge_memlock(u32 pages); 438 void *bpf_map_area_alloc(size_t size, int numa_node); 439 void bpf_map_area_free(void *base); 440 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr); 441 442 extern int sysctl_unprivileged_bpf_disabled; 443 444 int bpf_map_new_fd(struct bpf_map *map, int flags); 445 int bpf_prog_new_fd(struct bpf_prog *prog); 446 447 int bpf_obj_pin_user(u32 ufd, const char __user *pathname); 448 int bpf_obj_get_user(const char __user *pathname, int flags); 449 450 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value); 451 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value); 452 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value, 453 u64 flags); 454 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value, 455 u64 flags); 456 457 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value); 458 459 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file, 460 void *key, void *value, u64 map_flags); 461 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 462 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file, 463 void *key, void *value, u64 map_flags); 464 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 465 466 int bpf_get_file_flag(int flags); 467 int bpf_check_uarg_tail_zero(void __user *uaddr, size_t expected_size, 468 size_t actual_size); 469 470 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and 471 * forced to use 'long' read/writes to try to atomically copy long counters. 472 * Best-effort only. No barriers here, since it _will_ race with concurrent 473 * updates from BPF programs. Called from bpf syscall and mostly used with 474 * size 8 or 16 bytes, so ask compiler to inline it. 475 */ 476 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size) 477 { 478 const long *lsrc = src; 479 long *ldst = dst; 480 481 size /= sizeof(long); 482 while (size--) 483 *ldst++ = *lsrc++; 484 } 485 486 /* verify correctness of eBPF program */ 487 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr); 488 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth); 489 490 /* Map specifics */ 491 struct xdp_buff; 492 struct sk_buff; 493 494 struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key); 495 void __dev_map_insert_ctx(struct bpf_map *map, u32 index); 496 void __dev_map_flush(struct bpf_map *map); 497 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, 498 struct net_device *dev_rx); 499 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb, 500 struct bpf_prog *xdp_prog); 501 502 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key); 503 void __cpu_map_insert_ctx(struct bpf_map *map, u32 index); 504 void __cpu_map_flush(struct bpf_map *map); 505 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp, 506 struct net_device *dev_rx); 507 508 /* Return map's numa specified by userspace */ 509 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr) 510 { 511 return (attr->map_flags & BPF_F_NUMA_NODE) ? 512 attr->numa_node : NUMA_NO_NODE; 513 } 514 515 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type); 516 517 #else /* !CONFIG_BPF_SYSCALL */ 518 static inline struct bpf_prog *bpf_prog_get(u32 ufd) 519 { 520 return ERR_PTR(-EOPNOTSUPP); 521 } 522 523 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, 524 enum bpf_prog_type type, 525 bool attach_drv) 526 { 527 return ERR_PTR(-EOPNOTSUPP); 528 } 529 530 static inline struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, 531 int i) 532 { 533 return ERR_PTR(-EOPNOTSUPP); 534 } 535 536 static inline void bpf_prog_sub(struct bpf_prog *prog, int i) 537 { 538 } 539 540 static inline void bpf_prog_put(struct bpf_prog *prog) 541 { 542 } 543 544 static inline struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog) 545 { 546 return ERR_PTR(-EOPNOTSUPP); 547 } 548 549 static inline struct bpf_prog *__must_check 550 bpf_prog_inc_not_zero(struct bpf_prog *prog) 551 { 552 return ERR_PTR(-EOPNOTSUPP); 553 } 554 555 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages) 556 { 557 return 0; 558 } 559 560 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages) 561 { 562 } 563 564 static inline int bpf_obj_get_user(const char __user *pathname, int flags) 565 { 566 return -EOPNOTSUPP; 567 } 568 569 static inline struct net_device *__dev_map_lookup_elem(struct bpf_map *map, 570 u32 key) 571 { 572 return NULL; 573 } 574 575 static inline void __dev_map_insert_ctx(struct bpf_map *map, u32 index) 576 { 577 } 578 579 static inline void __dev_map_flush(struct bpf_map *map) 580 { 581 } 582 583 struct xdp_buff; 584 struct bpf_dtab_netdev; 585 586 static inline 587 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, 588 struct net_device *dev_rx) 589 { 590 return 0; 591 } 592 593 struct sk_buff; 594 595 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, 596 struct sk_buff *skb, 597 struct bpf_prog *xdp_prog) 598 { 599 return 0; 600 } 601 602 static inline 603 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key) 604 { 605 return NULL; 606 } 607 608 static inline void __cpu_map_insert_ctx(struct bpf_map *map, u32 index) 609 { 610 } 611 612 static inline void __cpu_map_flush(struct bpf_map *map) 613 { 614 } 615 616 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, 617 struct xdp_buff *xdp, 618 struct net_device *dev_rx) 619 { 620 return 0; 621 } 622 623 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name, 624 enum bpf_prog_type type) 625 { 626 return ERR_PTR(-EOPNOTSUPP); 627 } 628 #endif /* CONFIG_BPF_SYSCALL */ 629 630 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd, 631 enum bpf_prog_type type) 632 { 633 return bpf_prog_get_type_dev(ufd, type, false); 634 } 635 636 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool); 637 638 int bpf_prog_offload_compile(struct bpf_prog *prog); 639 void bpf_prog_offload_destroy(struct bpf_prog *prog); 640 int bpf_prog_offload_info_fill(struct bpf_prog_info *info, 641 struct bpf_prog *prog); 642 643 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map); 644 645 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value); 646 int bpf_map_offload_update_elem(struct bpf_map *map, 647 void *key, void *value, u64 flags); 648 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key); 649 int bpf_map_offload_get_next_key(struct bpf_map *map, 650 void *key, void *next_key); 651 652 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map); 653 654 struct bpf_offload_dev *bpf_offload_dev_create(void); 655 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev); 656 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev, 657 struct net_device *netdev); 658 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev, 659 struct net_device *netdev); 660 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev); 661 662 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL) 663 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr); 664 665 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux) 666 { 667 return aux->offload_requested; 668 } 669 670 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 671 { 672 return unlikely(map->ops == &bpf_map_offload_ops); 673 } 674 675 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr); 676 void bpf_map_offload_map_free(struct bpf_map *map); 677 #else 678 static inline int bpf_prog_offload_init(struct bpf_prog *prog, 679 union bpf_attr *attr) 680 { 681 return -EOPNOTSUPP; 682 } 683 684 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux) 685 { 686 return false; 687 } 688 689 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 690 { 691 return false; 692 } 693 694 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr) 695 { 696 return ERR_PTR(-EOPNOTSUPP); 697 } 698 699 static inline void bpf_map_offload_map_free(struct bpf_map *map) 700 { 701 } 702 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */ 703 704 #if defined(CONFIG_STREAM_PARSER) && defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_INET) 705 struct sock *__sock_map_lookup_elem(struct bpf_map *map, u32 key); 706 struct sock *__sock_hash_lookup_elem(struct bpf_map *map, void *key); 707 int sock_map_prog(struct bpf_map *map, struct bpf_prog *prog, u32 type); 708 int sockmap_get_from_fd(const union bpf_attr *attr, int type, 709 struct bpf_prog *prog); 710 #else 711 static inline struct sock *__sock_map_lookup_elem(struct bpf_map *map, u32 key) 712 { 713 return NULL; 714 } 715 716 static inline struct sock *__sock_hash_lookup_elem(struct bpf_map *map, 717 void *key) 718 { 719 return NULL; 720 } 721 722 static inline int sock_map_prog(struct bpf_map *map, 723 struct bpf_prog *prog, 724 u32 type) 725 { 726 return -EOPNOTSUPP; 727 } 728 729 static inline int sockmap_get_from_fd(const union bpf_attr *attr, int type, 730 struct bpf_prog *prog) 731 { 732 return -EINVAL; 733 } 734 #endif 735 736 #if defined(CONFIG_XDP_SOCKETS) 737 struct xdp_sock; 738 struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, u32 key); 739 int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp, 740 struct xdp_sock *xs); 741 void __xsk_map_flush(struct bpf_map *map); 742 #else 743 struct xdp_sock; 744 static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, 745 u32 key) 746 { 747 return NULL; 748 } 749 750 static inline int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp, 751 struct xdp_sock *xs) 752 { 753 return -EOPNOTSUPP; 754 } 755 756 static inline void __xsk_map_flush(struct bpf_map *map) 757 { 758 } 759 #endif 760 761 /* verifier prototypes for helper functions called from eBPF programs */ 762 extern const struct bpf_func_proto bpf_map_lookup_elem_proto; 763 extern const struct bpf_func_proto bpf_map_update_elem_proto; 764 extern const struct bpf_func_proto bpf_map_delete_elem_proto; 765 766 extern const struct bpf_func_proto bpf_get_prandom_u32_proto; 767 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto; 768 extern const struct bpf_func_proto bpf_get_numa_node_id_proto; 769 extern const struct bpf_func_proto bpf_tail_call_proto; 770 extern const struct bpf_func_proto bpf_ktime_get_ns_proto; 771 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto; 772 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto; 773 extern const struct bpf_func_proto bpf_get_current_comm_proto; 774 extern const struct bpf_func_proto bpf_get_stackid_proto; 775 extern const struct bpf_func_proto bpf_get_stack_proto; 776 extern const struct bpf_func_proto bpf_sock_map_update_proto; 777 extern const struct bpf_func_proto bpf_sock_hash_update_proto; 778 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto; 779 780 /* Shared helpers among cBPF and eBPF. */ 781 void bpf_user_rnd_init_once(void); 782 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 783 784 #endif /* _LINUX_BPF_H */ 785