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 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock */ 158 }; 159 160 /* type of values returned from helper functions */ 161 enum bpf_return_type { 162 RET_INTEGER, /* function returns integer */ 163 RET_VOID, /* function doesn't return anything */ 164 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */ 165 RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */ 166 RET_PTR_TO_SOCKET_OR_NULL, /* returns a pointer to a socket or NULL */ 167 }; 168 169 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs 170 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL 171 * instructions after verifying 172 */ 173 struct bpf_func_proto { 174 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 175 bool gpl_only; 176 bool pkt_access; 177 enum bpf_return_type ret_type; 178 enum bpf_arg_type arg1_type; 179 enum bpf_arg_type arg2_type; 180 enum bpf_arg_type arg3_type; 181 enum bpf_arg_type arg4_type; 182 enum bpf_arg_type arg5_type; 183 }; 184 185 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is 186 * the first argument to eBPF programs. 187 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *' 188 */ 189 struct bpf_context; 190 191 enum bpf_access_type { 192 BPF_READ = 1, 193 BPF_WRITE = 2 194 }; 195 196 /* types of values stored in eBPF registers */ 197 /* Pointer types represent: 198 * pointer 199 * pointer + imm 200 * pointer + (u16) var 201 * pointer + (u16) var + imm 202 * if (range > 0) then [ptr, ptr + range - off) is safe to access 203 * if (id > 0) means that some 'var' was added 204 * if (off > 0) means that 'imm' was added 205 */ 206 enum bpf_reg_type { 207 NOT_INIT = 0, /* nothing was written into register */ 208 SCALAR_VALUE, /* reg doesn't contain a valid pointer */ 209 PTR_TO_CTX, /* reg points to bpf_context */ 210 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */ 211 PTR_TO_MAP_VALUE, /* reg points to map element value */ 212 PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */ 213 PTR_TO_STACK, /* reg == frame_pointer + offset */ 214 PTR_TO_PACKET_META, /* skb->data - meta_len */ 215 PTR_TO_PACKET, /* reg points to skb->data */ 216 PTR_TO_PACKET_END, /* skb->data + headlen */ 217 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */ 218 PTR_TO_SOCKET, /* reg points to struct bpf_sock */ 219 PTR_TO_SOCKET_OR_NULL, /* reg points to struct bpf_sock or NULL */ 220 }; 221 222 /* The information passed from prog-specific *_is_valid_access 223 * back to the verifier. 224 */ 225 struct bpf_insn_access_aux { 226 enum bpf_reg_type reg_type; 227 int ctx_field_size; 228 }; 229 230 static inline void 231 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size) 232 { 233 aux->ctx_field_size = size; 234 } 235 236 struct bpf_prog_ops { 237 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr, 238 union bpf_attr __user *uattr); 239 }; 240 241 struct bpf_verifier_ops { 242 /* return eBPF function prototype for verification */ 243 const struct bpf_func_proto * 244 (*get_func_proto)(enum bpf_func_id func_id, 245 const struct bpf_prog *prog); 246 247 /* return true if 'size' wide access at offset 'off' within bpf_context 248 * with 'type' (read or write) is allowed 249 */ 250 bool (*is_valid_access)(int off, int size, enum bpf_access_type type, 251 const struct bpf_prog *prog, 252 struct bpf_insn_access_aux *info); 253 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write, 254 const struct bpf_prog *prog); 255 int (*gen_ld_abs)(const struct bpf_insn *orig, 256 struct bpf_insn *insn_buf); 257 u32 (*convert_ctx_access)(enum bpf_access_type type, 258 const struct bpf_insn *src, 259 struct bpf_insn *dst, 260 struct bpf_prog *prog, u32 *target_size); 261 }; 262 263 struct bpf_prog_offload_ops { 264 int (*insn_hook)(struct bpf_verifier_env *env, 265 int insn_idx, int prev_insn_idx); 266 int (*finalize)(struct bpf_verifier_env *env); 267 }; 268 269 struct bpf_prog_offload { 270 struct bpf_prog *prog; 271 struct net_device *netdev; 272 void *dev_priv; 273 struct list_head offloads; 274 bool dev_state; 275 const struct bpf_prog_offload_ops *dev_ops; 276 void *jited_image; 277 u32 jited_len; 278 }; 279 280 enum bpf_cgroup_storage_type { 281 BPF_CGROUP_STORAGE_SHARED, 282 BPF_CGROUP_STORAGE_PERCPU, 283 __BPF_CGROUP_STORAGE_MAX 284 }; 285 286 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX 287 288 struct bpf_prog_aux { 289 atomic_t refcnt; 290 u32 used_map_cnt; 291 u32 max_ctx_offset; 292 u32 stack_depth; 293 u32 id; 294 u32 func_cnt; 295 bool offload_requested; 296 struct bpf_prog **func; 297 void *jit_data; /* JIT specific data. arch dependent */ 298 struct latch_tree_node ksym_tnode; 299 struct list_head ksym_lnode; 300 const struct bpf_prog_ops *ops; 301 struct bpf_map **used_maps; 302 struct bpf_prog *prog; 303 struct user_struct *user; 304 u64 load_time; /* ns since boottime */ 305 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]; 306 char name[BPF_OBJ_NAME_LEN]; 307 #ifdef CONFIG_SECURITY 308 void *security; 309 #endif 310 struct bpf_prog_offload *offload; 311 union { 312 struct work_struct work; 313 struct rcu_head rcu; 314 }; 315 }; 316 317 struct bpf_array { 318 struct bpf_map map; 319 u32 elem_size; 320 u32 index_mask; 321 /* 'ownership' of prog_array is claimed by the first program that 322 * is going to use this map or by the first program which FD is stored 323 * in the map to make sure that all callers and callees have the same 324 * prog_type and JITed flag 325 */ 326 enum bpf_prog_type owner_prog_type; 327 bool owner_jited; 328 union { 329 char value[0] __aligned(8); 330 void *ptrs[0] __aligned(8); 331 void __percpu *pptrs[0] __aligned(8); 332 }; 333 }; 334 335 #define MAX_TAIL_CALL_CNT 32 336 337 struct bpf_event_entry { 338 struct perf_event *event; 339 struct file *perf_file; 340 struct file *map_file; 341 struct rcu_head rcu; 342 }; 343 344 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp); 345 int bpf_prog_calc_tag(struct bpf_prog *fp); 346 347 const struct bpf_func_proto *bpf_get_trace_printk_proto(void); 348 349 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src, 350 unsigned long off, unsigned long len); 351 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type, 352 const struct bpf_insn *src, 353 struct bpf_insn *dst, 354 struct bpf_prog *prog, 355 u32 *target_size); 356 357 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, 358 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy); 359 360 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, 361 union bpf_attr __user *uattr); 362 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, 363 union bpf_attr __user *uattr); 364 365 /* an array of programs to be executed under rcu_lock. 366 * 367 * Typical usage: 368 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN); 369 * 370 * the structure returned by bpf_prog_array_alloc() should be populated 371 * with program pointers and the last pointer must be NULL. 372 * The user has to keep refcnt on the program and make sure the program 373 * is removed from the array before bpf_prog_put(). 374 * The 'struct bpf_prog_array *' should only be replaced with xchg() 375 * since other cpus are walking the array of pointers in parallel. 376 */ 377 struct bpf_prog_array_item { 378 struct bpf_prog *prog; 379 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]; 380 }; 381 382 struct bpf_prog_array { 383 struct rcu_head rcu; 384 struct bpf_prog_array_item items[0]; 385 }; 386 387 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags); 388 void bpf_prog_array_free(struct bpf_prog_array __rcu *progs); 389 int bpf_prog_array_length(struct bpf_prog_array __rcu *progs); 390 int bpf_prog_array_copy_to_user(struct bpf_prog_array __rcu *progs, 391 __u32 __user *prog_ids, u32 cnt); 392 393 void bpf_prog_array_delete_safe(struct bpf_prog_array __rcu *progs, 394 struct bpf_prog *old_prog); 395 int bpf_prog_array_copy_info(struct bpf_prog_array __rcu *array, 396 u32 *prog_ids, u32 request_cnt, 397 u32 *prog_cnt); 398 int bpf_prog_array_copy(struct bpf_prog_array __rcu *old_array, 399 struct bpf_prog *exclude_prog, 400 struct bpf_prog *include_prog, 401 struct bpf_prog_array **new_array); 402 403 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null) \ 404 ({ \ 405 struct bpf_prog_array_item *_item; \ 406 struct bpf_prog *_prog; \ 407 struct bpf_prog_array *_array; \ 408 u32 _ret = 1; \ 409 preempt_disable(); \ 410 rcu_read_lock(); \ 411 _array = rcu_dereference(array); \ 412 if (unlikely(check_non_null && !_array))\ 413 goto _out; \ 414 _item = &_array->items[0]; \ 415 while ((_prog = READ_ONCE(_item->prog))) { \ 416 bpf_cgroup_storage_set(_item->cgroup_storage); \ 417 _ret &= func(_prog, ctx); \ 418 _item++; \ 419 } \ 420 _out: \ 421 rcu_read_unlock(); \ 422 preempt_enable_no_resched(); \ 423 _ret; \ 424 }) 425 426 #define BPF_PROG_RUN_ARRAY(array, ctx, func) \ 427 __BPF_PROG_RUN_ARRAY(array, ctx, func, false) 428 429 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \ 430 __BPF_PROG_RUN_ARRAY(array, ctx, func, true) 431 432 #ifdef CONFIG_BPF_SYSCALL 433 DECLARE_PER_CPU(int, bpf_prog_active); 434 435 extern const struct file_operations bpf_map_fops; 436 extern const struct file_operations bpf_prog_fops; 437 438 #define BPF_PROG_TYPE(_id, _name) \ 439 extern const struct bpf_prog_ops _name ## _prog_ops; \ 440 extern const struct bpf_verifier_ops _name ## _verifier_ops; 441 #define BPF_MAP_TYPE(_id, _ops) \ 442 extern const struct bpf_map_ops _ops; 443 #include <linux/bpf_types.h> 444 #undef BPF_PROG_TYPE 445 #undef BPF_MAP_TYPE 446 447 extern const struct bpf_prog_ops bpf_offload_prog_ops; 448 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops; 449 extern const struct bpf_verifier_ops xdp_analyzer_ops; 450 451 struct bpf_prog *bpf_prog_get(u32 ufd); 452 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, 453 bool attach_drv); 454 struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, int i); 455 void bpf_prog_sub(struct bpf_prog *prog, int i); 456 struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog); 457 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog); 458 void bpf_prog_put(struct bpf_prog *prog); 459 int __bpf_prog_charge(struct user_struct *user, u32 pages); 460 void __bpf_prog_uncharge(struct user_struct *user, u32 pages); 461 462 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock); 463 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock); 464 465 struct bpf_map *bpf_map_get_with_uref(u32 ufd); 466 struct bpf_map *__bpf_map_get(struct fd f); 467 struct bpf_map * __must_check bpf_map_inc(struct bpf_map *map, bool uref); 468 void bpf_map_put_with_uref(struct bpf_map *map); 469 void bpf_map_put(struct bpf_map *map); 470 int bpf_map_precharge_memlock(u32 pages); 471 int bpf_map_charge_memlock(struct bpf_map *map, u32 pages); 472 void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages); 473 void *bpf_map_area_alloc(size_t size, int numa_node); 474 void bpf_map_area_free(void *base); 475 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr); 476 477 extern int sysctl_unprivileged_bpf_disabled; 478 479 int bpf_map_new_fd(struct bpf_map *map, int flags); 480 int bpf_prog_new_fd(struct bpf_prog *prog); 481 482 int bpf_obj_pin_user(u32 ufd, const char __user *pathname); 483 int bpf_obj_get_user(const char __user *pathname, int flags); 484 485 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value); 486 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value); 487 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value, 488 u64 flags); 489 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value, 490 u64 flags); 491 492 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value); 493 494 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file, 495 void *key, void *value, u64 map_flags); 496 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 497 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file, 498 void *key, void *value, u64 map_flags); 499 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 500 501 int bpf_get_file_flag(int flags); 502 int bpf_check_uarg_tail_zero(void __user *uaddr, size_t expected_size, 503 size_t actual_size); 504 505 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and 506 * forced to use 'long' read/writes to try to atomically copy long counters. 507 * Best-effort only. No barriers here, since it _will_ race with concurrent 508 * updates from BPF programs. Called from bpf syscall and mostly used with 509 * size 8 or 16 bytes, so ask compiler to inline it. 510 */ 511 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size) 512 { 513 const long *lsrc = src; 514 long *ldst = dst; 515 516 size /= sizeof(long); 517 while (size--) 518 *ldst++ = *lsrc++; 519 } 520 521 /* verify correctness of eBPF program */ 522 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr); 523 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth); 524 525 /* Map specifics */ 526 struct xdp_buff; 527 struct sk_buff; 528 529 struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key); 530 void __dev_map_insert_ctx(struct bpf_map *map, u32 index); 531 void __dev_map_flush(struct bpf_map *map); 532 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, 533 struct net_device *dev_rx); 534 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb, 535 struct bpf_prog *xdp_prog); 536 537 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key); 538 void __cpu_map_insert_ctx(struct bpf_map *map, u32 index); 539 void __cpu_map_flush(struct bpf_map *map); 540 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp, 541 struct net_device *dev_rx); 542 543 /* Return map's numa specified by userspace */ 544 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr) 545 { 546 return (attr->map_flags & BPF_F_NUMA_NODE) ? 547 attr->numa_node : NUMA_NO_NODE; 548 } 549 550 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type); 551 int array_map_alloc_check(union bpf_attr *attr); 552 553 #else /* !CONFIG_BPF_SYSCALL */ 554 static inline struct bpf_prog *bpf_prog_get(u32 ufd) 555 { 556 return ERR_PTR(-EOPNOTSUPP); 557 } 558 559 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, 560 enum bpf_prog_type type, 561 bool attach_drv) 562 { 563 return ERR_PTR(-EOPNOTSUPP); 564 } 565 566 static inline struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, 567 int i) 568 { 569 return ERR_PTR(-EOPNOTSUPP); 570 } 571 572 static inline void bpf_prog_sub(struct bpf_prog *prog, int i) 573 { 574 } 575 576 static inline void bpf_prog_put(struct bpf_prog *prog) 577 { 578 } 579 580 static inline struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog) 581 { 582 return ERR_PTR(-EOPNOTSUPP); 583 } 584 585 static inline struct bpf_prog *__must_check 586 bpf_prog_inc_not_zero(struct bpf_prog *prog) 587 { 588 return ERR_PTR(-EOPNOTSUPP); 589 } 590 591 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages) 592 { 593 return 0; 594 } 595 596 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages) 597 { 598 } 599 600 static inline int bpf_obj_get_user(const char __user *pathname, int flags) 601 { 602 return -EOPNOTSUPP; 603 } 604 605 static inline struct net_device *__dev_map_lookup_elem(struct bpf_map *map, 606 u32 key) 607 { 608 return NULL; 609 } 610 611 static inline void __dev_map_insert_ctx(struct bpf_map *map, u32 index) 612 { 613 } 614 615 static inline void __dev_map_flush(struct bpf_map *map) 616 { 617 } 618 619 struct xdp_buff; 620 struct bpf_dtab_netdev; 621 622 static inline 623 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, 624 struct net_device *dev_rx) 625 { 626 return 0; 627 } 628 629 struct sk_buff; 630 631 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, 632 struct sk_buff *skb, 633 struct bpf_prog *xdp_prog) 634 { 635 return 0; 636 } 637 638 static inline 639 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key) 640 { 641 return NULL; 642 } 643 644 static inline void __cpu_map_insert_ctx(struct bpf_map *map, u32 index) 645 { 646 } 647 648 static inline void __cpu_map_flush(struct bpf_map *map) 649 { 650 } 651 652 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, 653 struct xdp_buff *xdp, 654 struct net_device *dev_rx) 655 { 656 return 0; 657 } 658 659 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name, 660 enum bpf_prog_type type) 661 { 662 return ERR_PTR(-EOPNOTSUPP); 663 } 664 #endif /* CONFIG_BPF_SYSCALL */ 665 666 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd, 667 enum bpf_prog_type type) 668 { 669 return bpf_prog_get_type_dev(ufd, type, false); 670 } 671 672 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool); 673 674 int bpf_prog_offload_compile(struct bpf_prog *prog); 675 void bpf_prog_offload_destroy(struct bpf_prog *prog); 676 int bpf_prog_offload_info_fill(struct bpf_prog_info *info, 677 struct bpf_prog *prog); 678 679 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map); 680 681 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value); 682 int bpf_map_offload_update_elem(struct bpf_map *map, 683 void *key, void *value, u64 flags); 684 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key); 685 int bpf_map_offload_get_next_key(struct bpf_map *map, 686 void *key, void *next_key); 687 688 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map); 689 690 struct bpf_offload_dev *bpf_offload_dev_create(void); 691 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev); 692 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev, 693 struct net_device *netdev); 694 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev, 695 struct net_device *netdev); 696 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev); 697 698 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL) 699 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr); 700 701 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux) 702 { 703 return aux->offload_requested; 704 } 705 706 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 707 { 708 return unlikely(map->ops == &bpf_map_offload_ops); 709 } 710 711 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr); 712 void bpf_map_offload_map_free(struct bpf_map *map); 713 #else 714 static inline int bpf_prog_offload_init(struct bpf_prog *prog, 715 union bpf_attr *attr) 716 { 717 return -EOPNOTSUPP; 718 } 719 720 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux) 721 { 722 return false; 723 } 724 725 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 726 { 727 return false; 728 } 729 730 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr) 731 { 732 return ERR_PTR(-EOPNOTSUPP); 733 } 734 735 static inline void bpf_map_offload_map_free(struct bpf_map *map) 736 { 737 } 738 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */ 739 740 #if defined(CONFIG_STREAM_PARSER) && defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_INET) 741 struct sock *__sock_map_lookup_elem(struct bpf_map *map, u32 key); 742 struct sock *__sock_hash_lookup_elem(struct bpf_map *map, void *key); 743 int sock_map_prog(struct bpf_map *map, struct bpf_prog *prog, u32 type); 744 int sockmap_get_from_fd(const union bpf_attr *attr, int type, 745 struct bpf_prog *prog); 746 #else 747 static inline struct sock *__sock_map_lookup_elem(struct bpf_map *map, u32 key) 748 { 749 return NULL; 750 } 751 752 static inline struct sock *__sock_hash_lookup_elem(struct bpf_map *map, 753 void *key) 754 { 755 return NULL; 756 } 757 758 static inline int sock_map_prog(struct bpf_map *map, 759 struct bpf_prog *prog, 760 u32 type) 761 { 762 return -EOPNOTSUPP; 763 } 764 765 static inline int sockmap_get_from_fd(const union bpf_attr *attr, int type, 766 struct bpf_prog *prog) 767 { 768 return -EINVAL; 769 } 770 #endif 771 772 #if defined(CONFIG_XDP_SOCKETS) 773 struct xdp_sock; 774 struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, u32 key); 775 int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp, 776 struct xdp_sock *xs); 777 void __xsk_map_flush(struct bpf_map *map); 778 #else 779 struct xdp_sock; 780 static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, 781 u32 key) 782 { 783 return NULL; 784 } 785 786 static inline int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp, 787 struct xdp_sock *xs) 788 { 789 return -EOPNOTSUPP; 790 } 791 792 static inline void __xsk_map_flush(struct bpf_map *map) 793 { 794 } 795 #endif 796 797 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) 798 void bpf_sk_reuseport_detach(struct sock *sk); 799 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key, 800 void *value); 801 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key, 802 void *value, u64 map_flags); 803 #else 804 static inline void bpf_sk_reuseport_detach(struct sock *sk) 805 { 806 } 807 808 #ifdef CONFIG_BPF_SYSCALL 809 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, 810 void *key, void *value) 811 { 812 return -EOPNOTSUPP; 813 } 814 815 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, 816 void *key, void *value, 817 u64 map_flags) 818 { 819 return -EOPNOTSUPP; 820 } 821 #endif /* CONFIG_BPF_SYSCALL */ 822 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */ 823 824 /* verifier prototypes for helper functions called from eBPF programs */ 825 extern const struct bpf_func_proto bpf_map_lookup_elem_proto; 826 extern const struct bpf_func_proto bpf_map_update_elem_proto; 827 extern const struct bpf_func_proto bpf_map_delete_elem_proto; 828 829 extern const struct bpf_func_proto bpf_get_prandom_u32_proto; 830 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto; 831 extern const struct bpf_func_proto bpf_get_numa_node_id_proto; 832 extern const struct bpf_func_proto bpf_tail_call_proto; 833 extern const struct bpf_func_proto bpf_ktime_get_ns_proto; 834 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto; 835 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto; 836 extern const struct bpf_func_proto bpf_get_current_comm_proto; 837 extern const struct bpf_func_proto bpf_get_stackid_proto; 838 extern const struct bpf_func_proto bpf_get_stack_proto; 839 extern const struct bpf_func_proto bpf_sock_map_update_proto; 840 extern const struct bpf_func_proto bpf_sock_hash_update_proto; 841 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto; 842 843 extern const struct bpf_func_proto bpf_get_local_storage_proto; 844 845 /* Shared helpers among cBPF and eBPF. */ 846 void bpf_user_rnd_init_once(void); 847 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 848 849 #if defined(CONFIG_NET) 850 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type, 851 struct bpf_insn_access_aux *info); 852 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 853 const struct bpf_insn *si, 854 struct bpf_insn *insn_buf, 855 struct bpf_prog *prog, 856 u32 *target_size); 857 #else 858 static inline bool bpf_sock_is_valid_access(int off, int size, 859 enum bpf_access_type type, 860 struct bpf_insn_access_aux *info) 861 { 862 return false; 863 } 864 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 865 const struct bpf_insn *si, 866 struct bpf_insn *insn_buf, 867 struct bpf_prog *prog, 868 u32 *target_size) 869 { 870 return 0; 871 } 872 #endif 873 874 #endif /* _LINUX_BPF_H */ 875