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 }; 216 217 /* The information passed from prog-specific *_is_valid_access 218 * back to the verifier. 219 */ 220 struct bpf_insn_access_aux { 221 enum bpf_reg_type reg_type; 222 int ctx_field_size; 223 }; 224 225 static inline void 226 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size) 227 { 228 aux->ctx_field_size = size; 229 } 230 231 struct bpf_prog_ops { 232 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr, 233 union bpf_attr __user *uattr); 234 }; 235 236 struct bpf_verifier_ops { 237 /* return eBPF function prototype for verification */ 238 const struct bpf_func_proto * 239 (*get_func_proto)(enum bpf_func_id func_id, 240 const struct bpf_prog *prog); 241 242 /* return true if 'size' wide access at offset 'off' within bpf_context 243 * with 'type' (read or write) is allowed 244 */ 245 bool (*is_valid_access)(int off, int size, enum bpf_access_type type, 246 const struct bpf_prog *prog, 247 struct bpf_insn_access_aux *info); 248 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write, 249 const struct bpf_prog *prog); 250 int (*gen_ld_abs)(const struct bpf_insn *orig, 251 struct bpf_insn *insn_buf); 252 u32 (*convert_ctx_access)(enum bpf_access_type type, 253 const struct bpf_insn *src, 254 struct bpf_insn *dst, 255 struct bpf_prog *prog, u32 *target_size); 256 }; 257 258 struct bpf_prog_offload_ops { 259 int (*insn_hook)(struct bpf_verifier_env *env, 260 int insn_idx, int prev_insn_idx); 261 }; 262 263 struct bpf_prog_offload { 264 struct bpf_prog *prog; 265 struct net_device *netdev; 266 void *dev_priv; 267 struct list_head offloads; 268 bool dev_state; 269 const struct bpf_prog_offload_ops *dev_ops; 270 void *jited_image; 271 u32 jited_len; 272 }; 273 274 struct bpf_prog_aux { 275 atomic_t refcnt; 276 u32 used_map_cnt; 277 u32 max_ctx_offset; 278 u32 stack_depth; 279 u32 id; 280 u32 func_cnt; 281 bool offload_requested; 282 struct bpf_prog **func; 283 void *jit_data; /* JIT specific data. arch dependent */ 284 struct latch_tree_node ksym_tnode; 285 struct list_head ksym_lnode; 286 const struct bpf_prog_ops *ops; 287 struct bpf_map **used_maps; 288 struct bpf_prog *prog; 289 struct user_struct *user; 290 u64 load_time; /* ns since boottime */ 291 struct bpf_map *cgroup_storage; 292 char name[BPF_OBJ_NAME_LEN]; 293 #ifdef CONFIG_SECURITY 294 void *security; 295 #endif 296 struct bpf_prog_offload *offload; 297 union { 298 struct work_struct work; 299 struct rcu_head rcu; 300 }; 301 }; 302 303 struct bpf_array { 304 struct bpf_map map; 305 u32 elem_size; 306 u32 index_mask; 307 /* 'ownership' of prog_array is claimed by the first program that 308 * is going to use this map or by the first program which FD is stored 309 * in the map to make sure that all callers and callees have the same 310 * prog_type and JITed flag 311 */ 312 enum bpf_prog_type owner_prog_type; 313 bool owner_jited; 314 union { 315 char value[0] __aligned(8); 316 void *ptrs[0] __aligned(8); 317 void __percpu *pptrs[0] __aligned(8); 318 }; 319 }; 320 321 #define MAX_TAIL_CALL_CNT 32 322 323 struct bpf_event_entry { 324 struct perf_event *event; 325 struct file *perf_file; 326 struct file *map_file; 327 struct rcu_head rcu; 328 }; 329 330 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp); 331 int bpf_prog_calc_tag(struct bpf_prog *fp); 332 333 const struct bpf_func_proto *bpf_get_trace_printk_proto(void); 334 335 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src, 336 unsigned long off, unsigned long len); 337 338 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, 339 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy); 340 341 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, 342 union bpf_attr __user *uattr); 343 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, 344 union bpf_attr __user *uattr); 345 346 /* an array of programs to be executed under rcu_lock. 347 * 348 * Typical usage: 349 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN); 350 * 351 * the structure returned by bpf_prog_array_alloc() should be populated 352 * with program pointers and the last pointer must be NULL. 353 * The user has to keep refcnt on the program and make sure the program 354 * is removed from the array before bpf_prog_put(). 355 * The 'struct bpf_prog_array *' should only be replaced with xchg() 356 * since other cpus are walking the array of pointers in parallel. 357 */ 358 struct bpf_prog_array_item { 359 struct bpf_prog *prog; 360 struct bpf_cgroup_storage *cgroup_storage; 361 }; 362 363 struct bpf_prog_array { 364 struct rcu_head rcu; 365 struct bpf_prog_array_item items[0]; 366 }; 367 368 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags); 369 void bpf_prog_array_free(struct bpf_prog_array __rcu *progs); 370 int bpf_prog_array_length(struct bpf_prog_array __rcu *progs); 371 int bpf_prog_array_copy_to_user(struct bpf_prog_array __rcu *progs, 372 __u32 __user *prog_ids, u32 cnt); 373 374 void bpf_prog_array_delete_safe(struct bpf_prog_array __rcu *progs, 375 struct bpf_prog *old_prog); 376 int bpf_prog_array_copy_info(struct bpf_prog_array __rcu *array, 377 u32 *prog_ids, u32 request_cnt, 378 u32 *prog_cnt); 379 int bpf_prog_array_copy(struct bpf_prog_array __rcu *old_array, 380 struct bpf_prog *exclude_prog, 381 struct bpf_prog *include_prog, 382 struct bpf_prog_array **new_array); 383 384 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null) \ 385 ({ \ 386 struct bpf_prog_array_item *_item; \ 387 struct bpf_prog *_prog; \ 388 struct bpf_prog_array *_array; \ 389 u32 _ret = 1; \ 390 preempt_disable(); \ 391 rcu_read_lock(); \ 392 _array = rcu_dereference(array); \ 393 if (unlikely(check_non_null && !_array))\ 394 goto _out; \ 395 _item = &_array->items[0]; \ 396 while ((_prog = READ_ONCE(_item->prog))) { \ 397 bpf_cgroup_storage_set(_item->cgroup_storage); \ 398 _ret &= func(_prog, ctx); \ 399 _item++; \ 400 } \ 401 _out: \ 402 rcu_read_unlock(); \ 403 preempt_enable_no_resched(); \ 404 _ret; \ 405 }) 406 407 #define BPF_PROG_RUN_ARRAY(array, ctx, func) \ 408 __BPF_PROG_RUN_ARRAY(array, ctx, func, false) 409 410 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \ 411 __BPF_PROG_RUN_ARRAY(array, ctx, func, true) 412 413 #ifdef CONFIG_BPF_SYSCALL 414 DECLARE_PER_CPU(int, bpf_prog_active); 415 416 extern const struct file_operations bpf_map_fops; 417 extern const struct file_operations bpf_prog_fops; 418 419 #define BPF_PROG_TYPE(_id, _name) \ 420 extern const struct bpf_prog_ops _name ## _prog_ops; \ 421 extern const struct bpf_verifier_ops _name ## _verifier_ops; 422 #define BPF_MAP_TYPE(_id, _ops) \ 423 extern const struct bpf_map_ops _ops; 424 #include <linux/bpf_types.h> 425 #undef BPF_PROG_TYPE 426 #undef BPF_MAP_TYPE 427 428 extern const struct bpf_prog_ops bpf_offload_prog_ops; 429 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops; 430 extern const struct bpf_verifier_ops xdp_analyzer_ops; 431 432 struct bpf_prog *bpf_prog_get(u32 ufd); 433 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, 434 bool attach_drv); 435 struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, int i); 436 void bpf_prog_sub(struct bpf_prog *prog, int i); 437 struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog); 438 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog); 439 void bpf_prog_put(struct bpf_prog *prog); 440 int __bpf_prog_charge(struct user_struct *user, u32 pages); 441 void __bpf_prog_uncharge(struct user_struct *user, u32 pages); 442 443 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock); 444 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock); 445 446 struct bpf_map *bpf_map_get_with_uref(u32 ufd); 447 struct bpf_map *__bpf_map_get(struct fd f); 448 struct bpf_map * __must_check bpf_map_inc(struct bpf_map *map, bool uref); 449 void bpf_map_put_with_uref(struct bpf_map *map); 450 void bpf_map_put(struct bpf_map *map); 451 int bpf_map_precharge_memlock(u32 pages); 452 int bpf_map_charge_memlock(struct bpf_map *map, u32 pages); 453 void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages); 454 void *bpf_map_area_alloc(size_t size, int numa_node); 455 void bpf_map_area_free(void *base); 456 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr); 457 458 extern int sysctl_unprivileged_bpf_disabled; 459 460 int bpf_map_new_fd(struct bpf_map *map, int flags); 461 int bpf_prog_new_fd(struct bpf_prog *prog); 462 463 int bpf_obj_pin_user(u32 ufd, const char __user *pathname); 464 int bpf_obj_get_user(const char __user *pathname, int flags); 465 466 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value); 467 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value); 468 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value, 469 u64 flags); 470 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value, 471 u64 flags); 472 473 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value); 474 475 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file, 476 void *key, void *value, u64 map_flags); 477 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 478 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file, 479 void *key, void *value, u64 map_flags); 480 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 481 482 int bpf_get_file_flag(int flags); 483 int bpf_check_uarg_tail_zero(void __user *uaddr, size_t expected_size, 484 size_t actual_size); 485 486 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and 487 * forced to use 'long' read/writes to try to atomically copy long counters. 488 * Best-effort only. No barriers here, since it _will_ race with concurrent 489 * updates from BPF programs. Called from bpf syscall and mostly used with 490 * size 8 or 16 bytes, so ask compiler to inline it. 491 */ 492 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size) 493 { 494 const long *lsrc = src; 495 long *ldst = dst; 496 497 size /= sizeof(long); 498 while (size--) 499 *ldst++ = *lsrc++; 500 } 501 502 /* verify correctness of eBPF program */ 503 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr); 504 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth); 505 506 /* Map specifics */ 507 struct xdp_buff; 508 struct sk_buff; 509 510 struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key); 511 void __dev_map_insert_ctx(struct bpf_map *map, u32 index); 512 void __dev_map_flush(struct bpf_map *map); 513 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, 514 struct net_device *dev_rx); 515 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb, 516 struct bpf_prog *xdp_prog); 517 518 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key); 519 void __cpu_map_insert_ctx(struct bpf_map *map, u32 index); 520 void __cpu_map_flush(struct bpf_map *map); 521 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp, 522 struct net_device *dev_rx); 523 524 /* Return map's numa specified by userspace */ 525 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr) 526 { 527 return (attr->map_flags & BPF_F_NUMA_NODE) ? 528 attr->numa_node : NUMA_NO_NODE; 529 } 530 531 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type); 532 int array_map_alloc_check(union bpf_attr *attr); 533 534 #else /* !CONFIG_BPF_SYSCALL */ 535 static inline struct bpf_prog *bpf_prog_get(u32 ufd) 536 { 537 return ERR_PTR(-EOPNOTSUPP); 538 } 539 540 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, 541 enum bpf_prog_type type, 542 bool attach_drv) 543 { 544 return ERR_PTR(-EOPNOTSUPP); 545 } 546 547 static inline struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, 548 int i) 549 { 550 return ERR_PTR(-EOPNOTSUPP); 551 } 552 553 static inline void bpf_prog_sub(struct bpf_prog *prog, int i) 554 { 555 } 556 557 static inline void bpf_prog_put(struct bpf_prog *prog) 558 { 559 } 560 561 static inline struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog) 562 { 563 return ERR_PTR(-EOPNOTSUPP); 564 } 565 566 static inline struct bpf_prog *__must_check 567 bpf_prog_inc_not_zero(struct bpf_prog *prog) 568 { 569 return ERR_PTR(-EOPNOTSUPP); 570 } 571 572 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages) 573 { 574 return 0; 575 } 576 577 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages) 578 { 579 } 580 581 static inline int bpf_obj_get_user(const char __user *pathname, int flags) 582 { 583 return -EOPNOTSUPP; 584 } 585 586 static inline struct net_device *__dev_map_lookup_elem(struct bpf_map *map, 587 u32 key) 588 { 589 return NULL; 590 } 591 592 static inline void __dev_map_insert_ctx(struct bpf_map *map, u32 index) 593 { 594 } 595 596 static inline void __dev_map_flush(struct bpf_map *map) 597 { 598 } 599 600 struct xdp_buff; 601 struct bpf_dtab_netdev; 602 603 static inline 604 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, 605 struct net_device *dev_rx) 606 { 607 return 0; 608 } 609 610 struct sk_buff; 611 612 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, 613 struct sk_buff *skb, 614 struct bpf_prog *xdp_prog) 615 { 616 return 0; 617 } 618 619 static inline 620 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key) 621 { 622 return NULL; 623 } 624 625 static inline void __cpu_map_insert_ctx(struct bpf_map *map, u32 index) 626 { 627 } 628 629 static inline void __cpu_map_flush(struct bpf_map *map) 630 { 631 } 632 633 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, 634 struct xdp_buff *xdp, 635 struct net_device *dev_rx) 636 { 637 return 0; 638 } 639 640 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name, 641 enum bpf_prog_type type) 642 { 643 return ERR_PTR(-EOPNOTSUPP); 644 } 645 #endif /* CONFIG_BPF_SYSCALL */ 646 647 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd, 648 enum bpf_prog_type type) 649 { 650 return bpf_prog_get_type_dev(ufd, type, false); 651 } 652 653 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool); 654 655 int bpf_prog_offload_compile(struct bpf_prog *prog); 656 void bpf_prog_offload_destroy(struct bpf_prog *prog); 657 int bpf_prog_offload_info_fill(struct bpf_prog_info *info, 658 struct bpf_prog *prog); 659 660 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map); 661 662 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value); 663 int bpf_map_offload_update_elem(struct bpf_map *map, 664 void *key, void *value, u64 flags); 665 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key); 666 int bpf_map_offload_get_next_key(struct bpf_map *map, 667 void *key, void *next_key); 668 669 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map); 670 671 struct bpf_offload_dev *bpf_offload_dev_create(void); 672 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev); 673 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev, 674 struct net_device *netdev); 675 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev, 676 struct net_device *netdev); 677 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev); 678 679 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL) 680 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr); 681 682 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux) 683 { 684 return aux->offload_requested; 685 } 686 687 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 688 { 689 return unlikely(map->ops == &bpf_map_offload_ops); 690 } 691 692 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr); 693 void bpf_map_offload_map_free(struct bpf_map *map); 694 #else 695 static inline int bpf_prog_offload_init(struct bpf_prog *prog, 696 union bpf_attr *attr) 697 { 698 return -EOPNOTSUPP; 699 } 700 701 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux) 702 { 703 return false; 704 } 705 706 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 707 { 708 return false; 709 } 710 711 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr) 712 { 713 return ERR_PTR(-EOPNOTSUPP); 714 } 715 716 static inline void bpf_map_offload_map_free(struct bpf_map *map) 717 { 718 } 719 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */ 720 721 #if defined(CONFIG_STREAM_PARSER) && defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_INET) 722 struct sock *__sock_map_lookup_elem(struct bpf_map *map, u32 key); 723 struct sock *__sock_hash_lookup_elem(struct bpf_map *map, void *key); 724 int sock_map_prog(struct bpf_map *map, struct bpf_prog *prog, u32 type); 725 int sockmap_get_from_fd(const union bpf_attr *attr, int type, 726 struct bpf_prog *prog); 727 #else 728 static inline struct sock *__sock_map_lookup_elem(struct bpf_map *map, u32 key) 729 { 730 return NULL; 731 } 732 733 static inline struct sock *__sock_hash_lookup_elem(struct bpf_map *map, 734 void *key) 735 { 736 return NULL; 737 } 738 739 static inline int sock_map_prog(struct bpf_map *map, 740 struct bpf_prog *prog, 741 u32 type) 742 { 743 return -EOPNOTSUPP; 744 } 745 746 static inline int sockmap_get_from_fd(const union bpf_attr *attr, int type, 747 struct bpf_prog *prog) 748 { 749 return -EINVAL; 750 } 751 #endif 752 753 #if defined(CONFIG_XDP_SOCKETS) 754 struct xdp_sock; 755 struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, u32 key); 756 int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp, 757 struct xdp_sock *xs); 758 void __xsk_map_flush(struct bpf_map *map); 759 #else 760 struct xdp_sock; 761 static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, 762 u32 key) 763 { 764 return NULL; 765 } 766 767 static inline int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp, 768 struct xdp_sock *xs) 769 { 770 return -EOPNOTSUPP; 771 } 772 773 static inline void __xsk_map_flush(struct bpf_map *map) 774 { 775 } 776 #endif 777 778 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) 779 void bpf_sk_reuseport_detach(struct sock *sk); 780 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key, 781 void *value); 782 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key, 783 void *value, u64 map_flags); 784 #else 785 static inline void bpf_sk_reuseport_detach(struct sock *sk) 786 { 787 } 788 789 #ifdef CONFIG_BPF_SYSCALL 790 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, 791 void *key, void *value) 792 { 793 return -EOPNOTSUPP; 794 } 795 796 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, 797 void *key, void *value, 798 u64 map_flags) 799 { 800 return -EOPNOTSUPP; 801 } 802 #endif /* CONFIG_BPF_SYSCALL */ 803 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */ 804 805 /* verifier prototypes for helper functions called from eBPF programs */ 806 extern const struct bpf_func_proto bpf_map_lookup_elem_proto; 807 extern const struct bpf_func_proto bpf_map_update_elem_proto; 808 extern const struct bpf_func_proto bpf_map_delete_elem_proto; 809 810 extern const struct bpf_func_proto bpf_get_prandom_u32_proto; 811 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto; 812 extern const struct bpf_func_proto bpf_get_numa_node_id_proto; 813 extern const struct bpf_func_proto bpf_tail_call_proto; 814 extern const struct bpf_func_proto bpf_ktime_get_ns_proto; 815 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto; 816 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto; 817 extern const struct bpf_func_proto bpf_get_current_comm_proto; 818 extern const struct bpf_func_proto bpf_get_stackid_proto; 819 extern const struct bpf_func_proto bpf_get_stack_proto; 820 extern const struct bpf_func_proto bpf_sock_map_update_proto; 821 extern const struct bpf_func_proto bpf_sock_hash_update_proto; 822 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto; 823 824 extern const struct bpf_func_proto bpf_get_local_storage_proto; 825 826 /* Shared helpers among cBPF and eBPF. */ 827 void bpf_user_rnd_init_once(void); 828 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 829 830 #endif /* _LINUX_BPF_H */ 831