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_type; 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, 52 const struct btf_type *key_type, 53 const struct btf_type *value_type); 54 }; 55 56 struct bpf_map { 57 /* The first two cachelines with read-mostly members of which some 58 * are also accessed in fast-path (e.g. ops, max_entries). 59 */ 60 const struct bpf_map_ops *ops ____cacheline_aligned; 61 struct bpf_map *inner_map_meta; 62 #ifdef CONFIG_SECURITY 63 void *security; 64 #endif 65 enum bpf_map_type map_type; 66 u32 key_size; 67 u32 value_size; 68 u32 max_entries; 69 u32 map_flags; 70 u32 pages; 71 u32 id; 72 int numa_node; 73 u32 btf_key_type_id; 74 u32 btf_value_type_id; 75 struct btf *btf; 76 bool unpriv_array; 77 /* 55 bytes hole */ 78 79 /* The 3rd and 4th cacheline with misc members to avoid false sharing 80 * particularly with refcounting. 81 */ 82 struct user_struct *user ____cacheline_aligned; 83 atomic_t refcnt; 84 atomic_t usercnt; 85 struct work_struct work; 86 char name[BPF_OBJ_NAME_LEN]; 87 }; 88 89 struct bpf_offload_dev; 90 struct bpf_offloaded_map; 91 92 struct bpf_map_dev_ops { 93 int (*map_get_next_key)(struct bpf_offloaded_map *map, 94 void *key, void *next_key); 95 int (*map_lookup_elem)(struct bpf_offloaded_map *map, 96 void *key, void *value); 97 int (*map_update_elem)(struct bpf_offloaded_map *map, 98 void *key, void *value, u64 flags); 99 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key); 100 }; 101 102 struct bpf_offloaded_map { 103 struct bpf_map map; 104 struct net_device *netdev; 105 const struct bpf_map_dev_ops *dev_ops; 106 void *dev_priv; 107 struct list_head offloads; 108 }; 109 110 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map) 111 { 112 return container_of(map, struct bpf_offloaded_map, map); 113 } 114 115 static inline bool bpf_map_offload_neutral(const struct bpf_map *map) 116 { 117 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY; 118 } 119 120 static inline bool bpf_map_support_seq_show(const struct bpf_map *map) 121 { 122 return map->btf && map->ops->map_seq_show_elem; 123 } 124 125 int map_check_no_btf(const struct bpf_map *map, 126 const struct btf_type *key_type, 127 const struct btf_type *value_type); 128 129 extern const struct bpf_map_ops bpf_map_offload_ops; 130 131 /* function argument constraints */ 132 enum bpf_arg_type { 133 ARG_DONTCARE = 0, /* unused argument in helper function */ 134 135 /* the following constraints used to prototype 136 * bpf_map_lookup/update/delete_elem() functions 137 */ 138 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */ 139 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */ 140 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */ 141 142 /* the following constraints used to prototype bpf_memcmp() and other 143 * functions that access data on eBPF program stack 144 */ 145 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */ 146 ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */ 147 ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized, 148 * helper function must fill all bytes or clear 149 * them in error case. 150 */ 151 152 ARG_CONST_SIZE, /* number of bytes accessed from memory */ 153 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */ 154 155 ARG_PTR_TO_CTX, /* pointer to context */ 156 ARG_ANYTHING, /* any (initialized) argument is ok */ 157 }; 158 159 /* type of values returned from helper functions */ 160 enum bpf_return_type { 161 RET_INTEGER, /* function returns integer */ 162 RET_VOID, /* function doesn't return anything */ 163 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */ 164 RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */ 165 }; 166 167 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs 168 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL 169 * instructions after verifying 170 */ 171 struct bpf_func_proto { 172 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 173 bool gpl_only; 174 bool pkt_access; 175 enum bpf_return_type ret_type; 176 enum bpf_arg_type arg1_type; 177 enum bpf_arg_type arg2_type; 178 enum bpf_arg_type arg3_type; 179 enum bpf_arg_type arg4_type; 180 enum bpf_arg_type arg5_type; 181 }; 182 183 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is 184 * the first argument to eBPF programs. 185 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *' 186 */ 187 struct bpf_context; 188 189 enum bpf_access_type { 190 BPF_READ = 1, 191 BPF_WRITE = 2 192 }; 193 194 /* types of values stored in eBPF registers */ 195 /* Pointer types represent: 196 * pointer 197 * pointer + imm 198 * pointer + (u16) var 199 * pointer + (u16) var + imm 200 * if (range > 0) then [ptr, ptr + range - off) is safe to access 201 * if (id > 0) means that some 'var' was added 202 * if (off > 0) means that 'imm' was added 203 */ 204 enum bpf_reg_type { 205 NOT_INIT = 0, /* nothing was written into register */ 206 SCALAR_VALUE, /* reg doesn't contain a valid pointer */ 207 PTR_TO_CTX, /* reg points to bpf_context */ 208 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */ 209 PTR_TO_MAP_VALUE, /* reg points to map element value */ 210 PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */ 211 PTR_TO_STACK, /* reg == frame_pointer + offset */ 212 PTR_TO_PACKET_META, /* skb->data - meta_len */ 213 PTR_TO_PACKET, /* reg points to skb->data */ 214 PTR_TO_PACKET_END, /* skb->data + headlen */ 215 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */ 216 }; 217 218 /* The information passed from prog-specific *_is_valid_access 219 * back to the verifier. 220 */ 221 struct bpf_insn_access_aux { 222 enum bpf_reg_type reg_type; 223 int ctx_field_size; 224 }; 225 226 static inline void 227 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size) 228 { 229 aux->ctx_field_size = size; 230 } 231 232 struct bpf_prog_ops { 233 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr, 234 union bpf_attr __user *uattr); 235 }; 236 237 struct bpf_verifier_ops { 238 /* return eBPF function prototype for verification */ 239 const struct bpf_func_proto * 240 (*get_func_proto)(enum bpf_func_id func_id, 241 const struct bpf_prog *prog); 242 243 /* return true if 'size' wide access at offset 'off' within bpf_context 244 * with 'type' (read or write) is allowed 245 */ 246 bool (*is_valid_access)(int off, int size, enum bpf_access_type type, 247 const struct bpf_prog *prog, 248 struct bpf_insn_access_aux *info); 249 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write, 250 const struct bpf_prog *prog); 251 int (*gen_ld_abs)(const struct bpf_insn *orig, 252 struct bpf_insn *insn_buf); 253 u32 (*convert_ctx_access)(enum bpf_access_type type, 254 const struct bpf_insn *src, 255 struct bpf_insn *dst, 256 struct bpf_prog *prog, u32 *target_size); 257 }; 258 259 struct bpf_prog_offload_ops { 260 int (*insn_hook)(struct bpf_verifier_env *env, 261 int insn_idx, int prev_insn_idx); 262 }; 263 264 struct bpf_prog_offload { 265 struct bpf_prog *prog; 266 struct net_device *netdev; 267 void *dev_priv; 268 struct list_head offloads; 269 bool dev_state; 270 const struct bpf_prog_offload_ops *dev_ops; 271 void *jited_image; 272 u32 jited_len; 273 }; 274 275 struct bpf_prog_aux { 276 atomic_t refcnt; 277 u32 used_map_cnt; 278 u32 max_ctx_offset; 279 u32 stack_depth; 280 u32 id; 281 u32 func_cnt; 282 bool offload_requested; 283 struct bpf_prog **func; 284 void *jit_data; /* JIT specific data. arch dependent */ 285 struct latch_tree_node ksym_tnode; 286 struct list_head ksym_lnode; 287 const struct bpf_prog_ops *ops; 288 struct bpf_map **used_maps; 289 struct bpf_prog *prog; 290 struct user_struct *user; 291 u64 load_time; /* ns since boottime */ 292 struct bpf_map *cgroup_storage; 293 char name[BPF_OBJ_NAME_LEN]; 294 #ifdef CONFIG_SECURITY 295 void *security; 296 #endif 297 struct bpf_prog_offload *offload; 298 union { 299 struct work_struct work; 300 struct rcu_head rcu; 301 }; 302 }; 303 304 struct bpf_array { 305 struct bpf_map map; 306 u32 elem_size; 307 u32 index_mask; 308 /* 'ownership' of prog_array is claimed by the first program that 309 * is going to use this map or by the first program which FD is stored 310 * in the map to make sure that all callers and callees have the same 311 * prog_type and JITed flag 312 */ 313 enum bpf_prog_type owner_prog_type; 314 bool owner_jited; 315 union { 316 char value[0] __aligned(8); 317 void *ptrs[0] __aligned(8); 318 void __percpu *pptrs[0] __aligned(8); 319 }; 320 }; 321 322 #define MAX_TAIL_CALL_CNT 32 323 324 struct bpf_event_entry { 325 struct perf_event *event; 326 struct file *perf_file; 327 struct file *map_file; 328 struct rcu_head rcu; 329 }; 330 331 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp); 332 int bpf_prog_calc_tag(struct bpf_prog *fp); 333 334 const struct bpf_func_proto *bpf_get_trace_printk_proto(void); 335 336 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src, 337 unsigned long off, unsigned long len); 338 339 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, 340 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy); 341 342 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, 343 union bpf_attr __user *uattr); 344 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, 345 union bpf_attr __user *uattr); 346 347 /* an array of programs to be executed under rcu_lock. 348 * 349 * Typical usage: 350 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN); 351 * 352 * the structure returned by bpf_prog_array_alloc() should be populated 353 * with program pointers and the last pointer must be NULL. 354 * The user has to keep refcnt on the program and make sure the program 355 * is removed from the array before bpf_prog_put(). 356 * The 'struct bpf_prog_array *' should only be replaced with xchg() 357 * since other cpus are walking the array of pointers in parallel. 358 */ 359 struct bpf_prog_array_item { 360 struct bpf_prog *prog; 361 struct bpf_cgroup_storage *cgroup_storage; 362 }; 363 364 struct bpf_prog_array { 365 struct rcu_head rcu; 366 struct bpf_prog_array_item items[0]; 367 }; 368 369 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags); 370 void bpf_prog_array_free(struct bpf_prog_array __rcu *progs); 371 int bpf_prog_array_length(struct bpf_prog_array __rcu *progs); 372 int bpf_prog_array_copy_to_user(struct bpf_prog_array __rcu *progs, 373 __u32 __user *prog_ids, u32 cnt); 374 375 void bpf_prog_array_delete_safe(struct bpf_prog_array __rcu *progs, 376 struct bpf_prog *old_prog); 377 int bpf_prog_array_copy_info(struct bpf_prog_array __rcu *array, 378 u32 *prog_ids, u32 request_cnt, 379 u32 *prog_cnt); 380 int bpf_prog_array_copy(struct bpf_prog_array __rcu *old_array, 381 struct bpf_prog *exclude_prog, 382 struct bpf_prog *include_prog, 383 struct bpf_prog_array **new_array); 384 385 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null) \ 386 ({ \ 387 struct bpf_prog_array_item *_item; \ 388 struct bpf_prog *_prog; \ 389 struct bpf_prog_array *_array; \ 390 u32 _ret = 1; \ 391 preempt_disable(); \ 392 rcu_read_lock(); \ 393 _array = rcu_dereference(array); \ 394 if (unlikely(check_non_null && !_array))\ 395 goto _out; \ 396 _item = &_array->items[0]; \ 397 while ((_prog = READ_ONCE(_item->prog))) { \ 398 bpf_cgroup_storage_set(_item->cgroup_storage); \ 399 _ret &= func(_prog, ctx); \ 400 _item++; \ 401 } \ 402 _out: \ 403 rcu_read_unlock(); \ 404 preempt_enable_no_resched(); \ 405 _ret; \ 406 }) 407 408 #define BPF_PROG_RUN_ARRAY(array, ctx, func) \ 409 __BPF_PROG_RUN_ARRAY(array, ctx, func, false) 410 411 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \ 412 __BPF_PROG_RUN_ARRAY(array, ctx, func, true) 413 414 #ifdef CONFIG_BPF_SYSCALL 415 DECLARE_PER_CPU(int, bpf_prog_active); 416 417 extern const struct file_operations bpf_map_fops; 418 extern const struct file_operations bpf_prog_fops; 419 420 #define BPF_PROG_TYPE(_id, _name) \ 421 extern const struct bpf_prog_ops _name ## _prog_ops; \ 422 extern const struct bpf_verifier_ops _name ## _verifier_ops; 423 #define BPF_MAP_TYPE(_id, _ops) \ 424 extern const struct bpf_map_ops _ops; 425 #include <linux/bpf_types.h> 426 #undef BPF_PROG_TYPE 427 #undef BPF_MAP_TYPE 428 429 extern const struct bpf_prog_ops bpf_offload_prog_ops; 430 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops; 431 extern const struct bpf_verifier_ops xdp_analyzer_ops; 432 433 struct bpf_prog *bpf_prog_get(u32 ufd); 434 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, 435 bool attach_drv); 436 struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, int i); 437 void bpf_prog_sub(struct bpf_prog *prog, int i); 438 struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog); 439 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog); 440 void bpf_prog_put(struct bpf_prog *prog); 441 int __bpf_prog_charge(struct user_struct *user, u32 pages); 442 void __bpf_prog_uncharge(struct user_struct *user, u32 pages); 443 444 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock); 445 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock); 446 447 struct bpf_map *bpf_map_get_with_uref(u32 ufd); 448 struct bpf_map *__bpf_map_get(struct fd f); 449 struct bpf_map * __must_check bpf_map_inc(struct bpf_map *map, bool uref); 450 void bpf_map_put_with_uref(struct bpf_map *map); 451 void bpf_map_put(struct bpf_map *map); 452 int bpf_map_precharge_memlock(u32 pages); 453 int bpf_map_charge_memlock(struct bpf_map *map, u32 pages); 454 void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages); 455 void *bpf_map_area_alloc(size_t size, int numa_node); 456 void bpf_map_area_free(void *base); 457 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr); 458 459 extern int sysctl_unprivileged_bpf_disabled; 460 461 int bpf_map_new_fd(struct bpf_map *map, int flags); 462 int bpf_prog_new_fd(struct bpf_prog *prog); 463 464 int bpf_obj_pin_user(u32 ufd, const char __user *pathname); 465 int bpf_obj_get_user(const char __user *pathname, int flags); 466 467 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value); 468 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value); 469 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value, 470 u64 flags); 471 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value, 472 u64 flags); 473 474 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value); 475 476 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file, 477 void *key, void *value, u64 map_flags); 478 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 479 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file, 480 void *key, void *value, u64 map_flags); 481 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 482 483 int bpf_get_file_flag(int flags); 484 int bpf_check_uarg_tail_zero(void __user *uaddr, size_t expected_size, 485 size_t actual_size); 486 487 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and 488 * forced to use 'long' read/writes to try to atomically copy long counters. 489 * Best-effort only. No barriers here, since it _will_ race with concurrent 490 * updates from BPF programs. Called from bpf syscall and mostly used with 491 * size 8 or 16 bytes, so ask compiler to inline it. 492 */ 493 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size) 494 { 495 const long *lsrc = src; 496 long *ldst = dst; 497 498 size /= sizeof(long); 499 while (size--) 500 *ldst++ = *lsrc++; 501 } 502 503 /* verify correctness of eBPF program */ 504 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr); 505 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth); 506 507 /* Map specifics */ 508 struct xdp_buff; 509 struct sk_buff; 510 511 struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key); 512 void __dev_map_insert_ctx(struct bpf_map *map, u32 index); 513 void __dev_map_flush(struct bpf_map *map); 514 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, 515 struct net_device *dev_rx); 516 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb, 517 struct bpf_prog *xdp_prog); 518 519 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key); 520 void __cpu_map_insert_ctx(struct bpf_map *map, u32 index); 521 void __cpu_map_flush(struct bpf_map *map); 522 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp, 523 struct net_device *dev_rx); 524 525 /* Return map's numa specified by userspace */ 526 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr) 527 { 528 return (attr->map_flags & BPF_F_NUMA_NODE) ? 529 attr->numa_node : NUMA_NO_NODE; 530 } 531 532 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type); 533 int array_map_alloc_check(union bpf_attr *attr); 534 535 #else /* !CONFIG_BPF_SYSCALL */ 536 static inline struct bpf_prog *bpf_prog_get(u32 ufd) 537 { 538 return ERR_PTR(-EOPNOTSUPP); 539 } 540 541 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, 542 enum bpf_prog_type type, 543 bool attach_drv) 544 { 545 return ERR_PTR(-EOPNOTSUPP); 546 } 547 548 static inline struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, 549 int i) 550 { 551 return ERR_PTR(-EOPNOTSUPP); 552 } 553 554 static inline void bpf_prog_sub(struct bpf_prog *prog, int i) 555 { 556 } 557 558 static inline void bpf_prog_put(struct bpf_prog *prog) 559 { 560 } 561 562 static inline struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog) 563 { 564 return ERR_PTR(-EOPNOTSUPP); 565 } 566 567 static inline struct bpf_prog *__must_check 568 bpf_prog_inc_not_zero(struct bpf_prog *prog) 569 { 570 return ERR_PTR(-EOPNOTSUPP); 571 } 572 573 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages) 574 { 575 return 0; 576 } 577 578 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages) 579 { 580 } 581 582 static inline int bpf_obj_get_user(const char __user *pathname, int flags) 583 { 584 return -EOPNOTSUPP; 585 } 586 587 static inline struct net_device *__dev_map_lookup_elem(struct bpf_map *map, 588 u32 key) 589 { 590 return NULL; 591 } 592 593 static inline void __dev_map_insert_ctx(struct bpf_map *map, u32 index) 594 { 595 } 596 597 static inline void __dev_map_flush(struct bpf_map *map) 598 { 599 } 600 601 struct xdp_buff; 602 struct bpf_dtab_netdev; 603 604 static inline 605 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, 606 struct net_device *dev_rx) 607 { 608 return 0; 609 } 610 611 struct sk_buff; 612 613 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, 614 struct sk_buff *skb, 615 struct bpf_prog *xdp_prog) 616 { 617 return 0; 618 } 619 620 static inline 621 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key) 622 { 623 return NULL; 624 } 625 626 static inline void __cpu_map_insert_ctx(struct bpf_map *map, u32 index) 627 { 628 } 629 630 static inline void __cpu_map_flush(struct bpf_map *map) 631 { 632 } 633 634 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, 635 struct xdp_buff *xdp, 636 struct net_device *dev_rx) 637 { 638 return 0; 639 } 640 641 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name, 642 enum bpf_prog_type type) 643 { 644 return ERR_PTR(-EOPNOTSUPP); 645 } 646 #endif /* CONFIG_BPF_SYSCALL */ 647 648 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd, 649 enum bpf_prog_type type) 650 { 651 return bpf_prog_get_type_dev(ufd, type, false); 652 } 653 654 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool); 655 656 int bpf_prog_offload_compile(struct bpf_prog *prog); 657 void bpf_prog_offload_destroy(struct bpf_prog *prog); 658 int bpf_prog_offload_info_fill(struct bpf_prog_info *info, 659 struct bpf_prog *prog); 660 661 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map); 662 663 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value); 664 int bpf_map_offload_update_elem(struct bpf_map *map, 665 void *key, void *value, u64 flags); 666 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key); 667 int bpf_map_offload_get_next_key(struct bpf_map *map, 668 void *key, void *next_key); 669 670 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map); 671 672 struct bpf_offload_dev *bpf_offload_dev_create(void); 673 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev); 674 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev, 675 struct net_device *netdev); 676 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev, 677 struct net_device *netdev); 678 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev); 679 680 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL) 681 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr); 682 683 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux) 684 { 685 return aux->offload_requested; 686 } 687 688 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 689 { 690 return unlikely(map->ops == &bpf_map_offload_ops); 691 } 692 693 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr); 694 void bpf_map_offload_map_free(struct bpf_map *map); 695 #else 696 static inline int bpf_prog_offload_init(struct bpf_prog *prog, 697 union bpf_attr *attr) 698 { 699 return -EOPNOTSUPP; 700 } 701 702 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux) 703 { 704 return false; 705 } 706 707 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 708 { 709 return false; 710 } 711 712 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr) 713 { 714 return ERR_PTR(-EOPNOTSUPP); 715 } 716 717 static inline void bpf_map_offload_map_free(struct bpf_map *map) 718 { 719 } 720 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */ 721 722 #if defined(CONFIG_STREAM_PARSER) && defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_INET) 723 struct sock *__sock_map_lookup_elem(struct bpf_map *map, u32 key); 724 struct sock *__sock_hash_lookup_elem(struct bpf_map *map, void *key); 725 int sock_map_prog(struct bpf_map *map, struct bpf_prog *prog, u32 type); 726 int sockmap_get_from_fd(const union bpf_attr *attr, int type, 727 struct bpf_prog *prog); 728 #else 729 static inline struct sock *__sock_map_lookup_elem(struct bpf_map *map, u32 key) 730 { 731 return NULL; 732 } 733 734 static inline struct sock *__sock_hash_lookup_elem(struct bpf_map *map, 735 void *key) 736 { 737 return NULL; 738 } 739 740 static inline int sock_map_prog(struct bpf_map *map, 741 struct bpf_prog *prog, 742 u32 type) 743 { 744 return -EOPNOTSUPP; 745 } 746 747 static inline int sockmap_get_from_fd(const union bpf_attr *attr, int type, 748 struct bpf_prog *prog) 749 { 750 return -EINVAL; 751 } 752 #endif 753 754 #if defined(CONFIG_XDP_SOCKETS) 755 struct xdp_sock; 756 struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, u32 key); 757 int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp, 758 struct xdp_sock *xs); 759 void __xsk_map_flush(struct bpf_map *map); 760 #else 761 struct xdp_sock; 762 static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, 763 u32 key) 764 { 765 return NULL; 766 } 767 768 static inline int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp, 769 struct xdp_sock *xs) 770 { 771 return -EOPNOTSUPP; 772 } 773 774 static inline void __xsk_map_flush(struct bpf_map *map) 775 { 776 } 777 #endif 778 779 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) 780 void bpf_sk_reuseport_detach(struct sock *sk); 781 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key, 782 void *value); 783 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key, 784 void *value, u64 map_flags); 785 #else 786 static inline void bpf_sk_reuseport_detach(struct sock *sk) 787 { 788 } 789 790 #ifdef CONFIG_BPF_SYSCALL 791 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, 792 void *key, void *value) 793 { 794 return -EOPNOTSUPP; 795 } 796 797 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, 798 void *key, void *value, 799 u64 map_flags) 800 { 801 return -EOPNOTSUPP; 802 } 803 #endif /* CONFIG_BPF_SYSCALL */ 804 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */ 805 806 /* verifier prototypes for helper functions called from eBPF programs */ 807 extern const struct bpf_func_proto bpf_map_lookup_elem_proto; 808 extern const struct bpf_func_proto bpf_map_update_elem_proto; 809 extern const struct bpf_func_proto bpf_map_delete_elem_proto; 810 811 extern const struct bpf_func_proto bpf_get_prandom_u32_proto; 812 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto; 813 extern const struct bpf_func_proto bpf_get_numa_node_id_proto; 814 extern const struct bpf_func_proto bpf_tail_call_proto; 815 extern const struct bpf_func_proto bpf_ktime_get_ns_proto; 816 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto; 817 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto; 818 extern const struct bpf_func_proto bpf_get_current_comm_proto; 819 extern const struct bpf_func_proto bpf_get_stackid_proto; 820 extern const struct bpf_func_proto bpf_get_stack_proto; 821 extern const struct bpf_func_proto bpf_sock_map_update_proto; 822 extern const struct bpf_func_proto bpf_sock_hash_update_proto; 823 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto; 824 825 extern const struct bpf_func_proto bpf_get_local_storage_proto; 826 827 /* Shared helpers among cBPF and eBPF. */ 828 void bpf_user_rnd_init_once(void); 829 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 830 831 #endif /* _LINUX_BPF_H */ 832