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 struct btf_type; 28 29 /* map is generic key/value storage optionally accesible by eBPF programs */ 30 struct bpf_map_ops { 31 /* funcs callable from userspace (via syscall) */ 32 int (*map_alloc_check)(union bpf_attr *attr); 33 struct bpf_map *(*map_alloc)(union bpf_attr *attr); 34 void (*map_release)(struct bpf_map *map, struct file *map_file); 35 void (*map_free)(struct bpf_map *map); 36 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key); 37 void (*map_release_uref)(struct bpf_map *map); 38 39 /* funcs callable from userspace and from eBPF programs */ 40 void *(*map_lookup_elem)(struct bpf_map *map, void *key); 41 int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags); 42 int (*map_delete_elem)(struct bpf_map *map, void *key); 43 int (*map_push_elem)(struct bpf_map *map, void *value, u64 flags); 44 int (*map_pop_elem)(struct bpf_map *map, void *value); 45 int (*map_peek_elem)(struct bpf_map *map, void *value); 46 47 /* funcs called by prog_array and perf_event_array map */ 48 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file, 49 int fd); 50 void (*map_fd_put_ptr)(void *ptr); 51 u32 (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf); 52 u32 (*map_fd_sys_lookup_elem)(void *ptr); 53 void (*map_seq_show_elem)(struct bpf_map *map, void *key, 54 struct seq_file *m); 55 int (*map_check_btf)(const struct bpf_map *map, 56 const struct btf *btf, 57 const struct btf_type *key_type, 58 const struct btf_type *value_type); 59 }; 60 61 struct bpf_map { 62 /* The first two cachelines with read-mostly members of which some 63 * are also accessed in fast-path (e.g. ops, max_entries). 64 */ 65 const struct bpf_map_ops *ops ____cacheline_aligned; 66 struct bpf_map *inner_map_meta; 67 #ifdef CONFIG_SECURITY 68 void *security; 69 #endif 70 enum bpf_map_type map_type; 71 u32 key_size; 72 u32 value_size; 73 u32 max_entries; 74 u32 map_flags; 75 u32 pages; 76 u32 id; 77 int numa_node; 78 u32 btf_key_type_id; 79 u32 btf_value_type_id; 80 struct btf *btf; 81 bool unpriv_array; 82 /* 55 bytes hole */ 83 84 /* The 3rd and 4th cacheline with misc members to avoid false sharing 85 * particularly with refcounting. 86 */ 87 struct user_struct *user ____cacheline_aligned; 88 atomic_t refcnt; 89 atomic_t usercnt; 90 struct work_struct work; 91 char name[BPF_OBJ_NAME_LEN]; 92 }; 93 94 struct bpf_offload_dev; 95 struct bpf_offloaded_map; 96 97 struct bpf_map_dev_ops { 98 int (*map_get_next_key)(struct bpf_offloaded_map *map, 99 void *key, void *next_key); 100 int (*map_lookup_elem)(struct bpf_offloaded_map *map, 101 void *key, void *value); 102 int (*map_update_elem)(struct bpf_offloaded_map *map, 103 void *key, void *value, u64 flags); 104 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key); 105 }; 106 107 struct bpf_offloaded_map { 108 struct bpf_map map; 109 struct net_device *netdev; 110 const struct bpf_map_dev_ops *dev_ops; 111 void *dev_priv; 112 struct list_head offloads; 113 }; 114 115 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map) 116 { 117 return container_of(map, struct bpf_offloaded_map, map); 118 } 119 120 static inline bool bpf_map_offload_neutral(const struct bpf_map *map) 121 { 122 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY; 123 } 124 125 static inline bool bpf_map_support_seq_show(const struct bpf_map *map) 126 { 127 return map->btf && map->ops->map_seq_show_elem; 128 } 129 130 int map_check_no_btf(const struct bpf_map *map, 131 const struct btf *btf, 132 const struct btf_type *key_type, 133 const struct btf_type *value_type); 134 135 extern const struct bpf_map_ops bpf_map_offload_ops; 136 137 /* function argument constraints */ 138 enum bpf_arg_type { 139 ARG_DONTCARE = 0, /* unused argument in helper function */ 140 141 /* the following constraints used to prototype 142 * bpf_map_lookup/update/delete_elem() functions 143 */ 144 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */ 145 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */ 146 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */ 147 ARG_PTR_TO_UNINIT_MAP_VALUE, /* pointer to valid memory used to store a map value */ 148 149 /* the following constraints used to prototype bpf_memcmp() and other 150 * functions that access data on eBPF program stack 151 */ 152 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */ 153 ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */ 154 ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized, 155 * helper function must fill all bytes or clear 156 * them in error case. 157 */ 158 159 ARG_CONST_SIZE, /* number of bytes accessed from memory */ 160 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */ 161 162 ARG_PTR_TO_CTX, /* pointer to context */ 163 ARG_ANYTHING, /* any (initialized) argument is ok */ 164 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock */ 165 }; 166 167 /* type of values returned from helper functions */ 168 enum bpf_return_type { 169 RET_INTEGER, /* function returns integer */ 170 RET_VOID, /* function doesn't return anything */ 171 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */ 172 RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */ 173 RET_PTR_TO_SOCKET_OR_NULL, /* returns a pointer to a socket or NULL */ 174 }; 175 176 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs 177 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL 178 * instructions after verifying 179 */ 180 struct bpf_func_proto { 181 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 182 bool gpl_only; 183 bool pkt_access; 184 enum bpf_return_type ret_type; 185 enum bpf_arg_type arg1_type; 186 enum bpf_arg_type arg2_type; 187 enum bpf_arg_type arg3_type; 188 enum bpf_arg_type arg4_type; 189 enum bpf_arg_type arg5_type; 190 }; 191 192 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is 193 * the first argument to eBPF programs. 194 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *' 195 */ 196 struct bpf_context; 197 198 enum bpf_access_type { 199 BPF_READ = 1, 200 BPF_WRITE = 2 201 }; 202 203 /* types of values stored in eBPF registers */ 204 /* Pointer types represent: 205 * pointer 206 * pointer + imm 207 * pointer + (u16) var 208 * pointer + (u16) var + imm 209 * if (range > 0) then [ptr, ptr + range - off) is safe to access 210 * if (id > 0) means that some 'var' was added 211 * if (off > 0) means that 'imm' was added 212 */ 213 enum bpf_reg_type { 214 NOT_INIT = 0, /* nothing was written into register */ 215 SCALAR_VALUE, /* reg doesn't contain a valid pointer */ 216 PTR_TO_CTX, /* reg points to bpf_context */ 217 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */ 218 PTR_TO_MAP_VALUE, /* reg points to map element value */ 219 PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */ 220 PTR_TO_STACK, /* reg == frame_pointer + offset */ 221 PTR_TO_PACKET_META, /* skb->data - meta_len */ 222 PTR_TO_PACKET, /* reg points to skb->data */ 223 PTR_TO_PACKET_END, /* skb->data + headlen */ 224 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */ 225 PTR_TO_SOCKET, /* reg points to struct bpf_sock */ 226 PTR_TO_SOCKET_OR_NULL, /* reg points to struct bpf_sock or NULL */ 227 }; 228 229 /* The information passed from prog-specific *_is_valid_access 230 * back to the verifier. 231 */ 232 struct bpf_insn_access_aux { 233 enum bpf_reg_type reg_type; 234 int ctx_field_size; 235 }; 236 237 static inline void 238 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size) 239 { 240 aux->ctx_field_size = size; 241 } 242 243 struct bpf_prog_ops { 244 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr, 245 union bpf_attr __user *uattr); 246 }; 247 248 struct bpf_verifier_ops { 249 /* return eBPF function prototype for verification */ 250 const struct bpf_func_proto * 251 (*get_func_proto)(enum bpf_func_id func_id, 252 const struct bpf_prog *prog); 253 254 /* return true if 'size' wide access at offset 'off' within bpf_context 255 * with 'type' (read or write) is allowed 256 */ 257 bool (*is_valid_access)(int off, int size, enum bpf_access_type type, 258 const struct bpf_prog *prog, 259 struct bpf_insn_access_aux *info); 260 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write, 261 const struct bpf_prog *prog); 262 int (*gen_ld_abs)(const struct bpf_insn *orig, 263 struct bpf_insn *insn_buf); 264 u32 (*convert_ctx_access)(enum bpf_access_type type, 265 const struct bpf_insn *src, 266 struct bpf_insn *dst, 267 struct bpf_prog *prog, u32 *target_size); 268 }; 269 270 struct bpf_prog_offload_ops { 271 int (*insn_hook)(struct bpf_verifier_env *env, 272 int insn_idx, int prev_insn_idx); 273 int (*finalize)(struct bpf_verifier_env *env); 274 int (*prepare)(struct bpf_prog *prog); 275 int (*translate)(struct bpf_prog *prog); 276 void (*destroy)(struct bpf_prog *prog); 277 }; 278 279 struct bpf_prog_offload { 280 struct bpf_prog *prog; 281 struct net_device *netdev; 282 struct bpf_offload_dev *offdev; 283 void *dev_priv; 284 struct list_head offloads; 285 bool dev_state; 286 void *jited_image; 287 u32 jited_len; 288 }; 289 290 enum bpf_cgroup_storage_type { 291 BPF_CGROUP_STORAGE_SHARED, 292 BPF_CGROUP_STORAGE_PERCPU, 293 __BPF_CGROUP_STORAGE_MAX 294 }; 295 296 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX 297 298 struct bpf_prog_aux { 299 atomic_t refcnt; 300 u32 used_map_cnt; 301 u32 max_ctx_offset; 302 u32 max_pkt_offset; 303 u32 stack_depth; 304 u32 id; 305 u32 func_cnt; /* used by non-func prog as the number of func progs */ 306 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */ 307 bool offload_requested; 308 struct bpf_prog **func; 309 void *jit_data; /* JIT specific data. arch dependent */ 310 struct latch_tree_node ksym_tnode; 311 struct list_head ksym_lnode; 312 const struct bpf_prog_ops *ops; 313 struct bpf_map **used_maps; 314 struct bpf_prog *prog; 315 struct user_struct *user; 316 u64 load_time; /* ns since boottime */ 317 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]; 318 char name[BPF_OBJ_NAME_LEN]; 319 #ifdef CONFIG_SECURITY 320 void *security; 321 #endif 322 struct bpf_prog_offload *offload; 323 struct btf *btf; 324 struct bpf_func_info *func_info; 325 /* bpf_line_info loaded from userspace. linfo->insn_off 326 * has the xlated insn offset. 327 * Both the main and sub prog share the same linfo. 328 * The subprog can access its first linfo by 329 * using the linfo_idx. 330 */ 331 struct bpf_line_info *linfo; 332 /* jited_linfo is the jited addr of the linfo. It has a 333 * one to one mapping to linfo: 334 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off. 335 * Both the main and sub prog share the same jited_linfo. 336 * The subprog can access its first jited_linfo by 337 * using the linfo_idx. 338 */ 339 void **jited_linfo; 340 u32 func_info_cnt; 341 u32 nr_linfo; 342 /* subprog can use linfo_idx to access its first linfo and 343 * jited_linfo. 344 * main prog always has linfo_idx == 0 345 */ 346 u32 linfo_idx; 347 union { 348 struct work_struct work; 349 struct rcu_head rcu; 350 }; 351 }; 352 353 struct bpf_array { 354 struct bpf_map map; 355 u32 elem_size; 356 u32 index_mask; 357 /* 'ownership' of prog_array is claimed by the first program that 358 * is going to use this map or by the first program which FD is stored 359 * in the map to make sure that all callers and callees have the same 360 * prog_type and JITed flag 361 */ 362 enum bpf_prog_type owner_prog_type; 363 bool owner_jited; 364 union { 365 char value[0] __aligned(8); 366 void *ptrs[0] __aligned(8); 367 void __percpu *pptrs[0] __aligned(8); 368 }; 369 }; 370 371 #define MAX_TAIL_CALL_CNT 32 372 373 struct bpf_event_entry { 374 struct perf_event *event; 375 struct file *perf_file; 376 struct file *map_file; 377 struct rcu_head rcu; 378 }; 379 380 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp); 381 int bpf_prog_calc_tag(struct bpf_prog *fp); 382 383 const struct bpf_func_proto *bpf_get_trace_printk_proto(void); 384 385 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src, 386 unsigned long off, unsigned long len); 387 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type, 388 const struct bpf_insn *src, 389 struct bpf_insn *dst, 390 struct bpf_prog *prog, 391 u32 *target_size); 392 393 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, 394 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy); 395 396 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, 397 union bpf_attr __user *uattr); 398 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, 399 union bpf_attr __user *uattr); 400 401 /* an array of programs to be executed under rcu_lock. 402 * 403 * Typical usage: 404 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN); 405 * 406 * the structure returned by bpf_prog_array_alloc() should be populated 407 * with program pointers and the last pointer must be NULL. 408 * The user has to keep refcnt on the program and make sure the program 409 * is removed from the array before bpf_prog_put(). 410 * The 'struct bpf_prog_array *' should only be replaced with xchg() 411 * since other cpus are walking the array of pointers in parallel. 412 */ 413 struct bpf_prog_array_item { 414 struct bpf_prog *prog; 415 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]; 416 }; 417 418 struct bpf_prog_array { 419 struct rcu_head rcu; 420 struct bpf_prog_array_item items[0]; 421 }; 422 423 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags); 424 void bpf_prog_array_free(struct bpf_prog_array __rcu *progs); 425 int bpf_prog_array_length(struct bpf_prog_array __rcu *progs); 426 int bpf_prog_array_copy_to_user(struct bpf_prog_array __rcu *progs, 427 __u32 __user *prog_ids, u32 cnt); 428 429 void bpf_prog_array_delete_safe(struct bpf_prog_array __rcu *progs, 430 struct bpf_prog *old_prog); 431 int bpf_prog_array_copy_info(struct bpf_prog_array __rcu *array, 432 u32 *prog_ids, u32 request_cnt, 433 u32 *prog_cnt); 434 int bpf_prog_array_copy(struct bpf_prog_array __rcu *old_array, 435 struct bpf_prog *exclude_prog, 436 struct bpf_prog *include_prog, 437 struct bpf_prog_array **new_array); 438 439 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null) \ 440 ({ \ 441 struct bpf_prog_array_item *_item; \ 442 struct bpf_prog *_prog; \ 443 struct bpf_prog_array *_array; \ 444 u32 _ret = 1; \ 445 preempt_disable(); \ 446 rcu_read_lock(); \ 447 _array = rcu_dereference(array); \ 448 if (unlikely(check_non_null && !_array))\ 449 goto _out; \ 450 _item = &_array->items[0]; \ 451 while ((_prog = READ_ONCE(_item->prog))) { \ 452 bpf_cgroup_storage_set(_item->cgroup_storage); \ 453 _ret &= func(_prog, ctx); \ 454 _item++; \ 455 } \ 456 _out: \ 457 rcu_read_unlock(); \ 458 preempt_enable_no_resched(); \ 459 _ret; \ 460 }) 461 462 #define BPF_PROG_RUN_ARRAY(array, ctx, func) \ 463 __BPF_PROG_RUN_ARRAY(array, ctx, func, false) 464 465 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \ 466 __BPF_PROG_RUN_ARRAY(array, ctx, func, true) 467 468 #ifdef CONFIG_BPF_SYSCALL 469 DECLARE_PER_CPU(int, bpf_prog_active); 470 471 extern const struct file_operations bpf_map_fops; 472 extern const struct file_operations bpf_prog_fops; 473 474 #define BPF_PROG_TYPE(_id, _name) \ 475 extern const struct bpf_prog_ops _name ## _prog_ops; \ 476 extern const struct bpf_verifier_ops _name ## _verifier_ops; 477 #define BPF_MAP_TYPE(_id, _ops) \ 478 extern const struct bpf_map_ops _ops; 479 #include <linux/bpf_types.h> 480 #undef BPF_PROG_TYPE 481 #undef BPF_MAP_TYPE 482 483 extern const struct bpf_prog_ops bpf_offload_prog_ops; 484 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops; 485 extern const struct bpf_verifier_ops xdp_analyzer_ops; 486 487 struct bpf_prog *bpf_prog_get(u32 ufd); 488 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, 489 bool attach_drv); 490 struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, int i); 491 void bpf_prog_sub(struct bpf_prog *prog, int i); 492 struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog); 493 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog); 494 void bpf_prog_put(struct bpf_prog *prog); 495 int __bpf_prog_charge(struct user_struct *user, u32 pages); 496 void __bpf_prog_uncharge(struct user_struct *user, u32 pages); 497 498 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock); 499 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock); 500 501 struct bpf_map *bpf_map_get_with_uref(u32 ufd); 502 struct bpf_map *__bpf_map_get(struct fd f); 503 struct bpf_map * __must_check bpf_map_inc(struct bpf_map *map, bool uref); 504 void bpf_map_put_with_uref(struct bpf_map *map); 505 void bpf_map_put(struct bpf_map *map); 506 int bpf_map_precharge_memlock(u32 pages); 507 int bpf_map_charge_memlock(struct bpf_map *map, u32 pages); 508 void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages); 509 void *bpf_map_area_alloc(size_t size, int numa_node); 510 void bpf_map_area_free(void *base); 511 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr); 512 513 extern int sysctl_unprivileged_bpf_disabled; 514 515 int bpf_map_new_fd(struct bpf_map *map, int flags); 516 int bpf_prog_new_fd(struct bpf_prog *prog); 517 518 int bpf_obj_pin_user(u32 ufd, const char __user *pathname); 519 int bpf_obj_get_user(const char __user *pathname, int flags); 520 521 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value); 522 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value); 523 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value, 524 u64 flags); 525 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value, 526 u64 flags); 527 528 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value); 529 530 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file, 531 void *key, void *value, u64 map_flags); 532 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 533 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file, 534 void *key, void *value, u64 map_flags); 535 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 536 537 int bpf_get_file_flag(int flags); 538 int bpf_check_uarg_tail_zero(void __user *uaddr, size_t expected_size, 539 size_t actual_size); 540 541 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and 542 * forced to use 'long' read/writes to try to atomically copy long counters. 543 * Best-effort only. No barriers here, since it _will_ race with concurrent 544 * updates from BPF programs. Called from bpf syscall and mostly used with 545 * size 8 or 16 bytes, so ask compiler to inline it. 546 */ 547 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size) 548 { 549 const long *lsrc = src; 550 long *ldst = dst; 551 552 size /= sizeof(long); 553 while (size--) 554 *ldst++ = *lsrc++; 555 } 556 557 /* verify correctness of eBPF program */ 558 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, 559 union bpf_attr __user *uattr); 560 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth); 561 562 /* Map specifics */ 563 struct xdp_buff; 564 struct sk_buff; 565 566 struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key); 567 void __dev_map_insert_ctx(struct bpf_map *map, u32 index); 568 void __dev_map_flush(struct bpf_map *map); 569 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, 570 struct net_device *dev_rx); 571 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb, 572 struct bpf_prog *xdp_prog); 573 574 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key); 575 void __cpu_map_insert_ctx(struct bpf_map *map, u32 index); 576 void __cpu_map_flush(struct bpf_map *map); 577 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp, 578 struct net_device *dev_rx); 579 580 /* Return map's numa specified by userspace */ 581 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr) 582 { 583 return (attr->map_flags & BPF_F_NUMA_NODE) ? 584 attr->numa_node : NUMA_NO_NODE; 585 } 586 587 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type); 588 int array_map_alloc_check(union bpf_attr *attr); 589 590 #else /* !CONFIG_BPF_SYSCALL */ 591 static inline struct bpf_prog *bpf_prog_get(u32 ufd) 592 { 593 return ERR_PTR(-EOPNOTSUPP); 594 } 595 596 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, 597 enum bpf_prog_type type, 598 bool attach_drv) 599 { 600 return ERR_PTR(-EOPNOTSUPP); 601 } 602 603 static inline struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, 604 int i) 605 { 606 return ERR_PTR(-EOPNOTSUPP); 607 } 608 609 static inline void bpf_prog_sub(struct bpf_prog *prog, int i) 610 { 611 } 612 613 static inline void bpf_prog_put(struct bpf_prog *prog) 614 { 615 } 616 617 static inline struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog) 618 { 619 return ERR_PTR(-EOPNOTSUPP); 620 } 621 622 static inline struct bpf_prog *__must_check 623 bpf_prog_inc_not_zero(struct bpf_prog *prog) 624 { 625 return ERR_PTR(-EOPNOTSUPP); 626 } 627 628 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages) 629 { 630 return 0; 631 } 632 633 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages) 634 { 635 } 636 637 static inline int bpf_obj_get_user(const char __user *pathname, int flags) 638 { 639 return -EOPNOTSUPP; 640 } 641 642 static inline struct net_device *__dev_map_lookup_elem(struct bpf_map *map, 643 u32 key) 644 { 645 return NULL; 646 } 647 648 static inline void __dev_map_insert_ctx(struct bpf_map *map, u32 index) 649 { 650 } 651 652 static inline void __dev_map_flush(struct bpf_map *map) 653 { 654 } 655 656 struct xdp_buff; 657 struct bpf_dtab_netdev; 658 659 static inline 660 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, 661 struct net_device *dev_rx) 662 { 663 return 0; 664 } 665 666 struct sk_buff; 667 668 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, 669 struct sk_buff *skb, 670 struct bpf_prog *xdp_prog) 671 { 672 return 0; 673 } 674 675 static inline 676 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key) 677 { 678 return NULL; 679 } 680 681 static inline void __cpu_map_insert_ctx(struct bpf_map *map, u32 index) 682 { 683 } 684 685 static inline void __cpu_map_flush(struct bpf_map *map) 686 { 687 } 688 689 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, 690 struct xdp_buff *xdp, 691 struct net_device *dev_rx) 692 { 693 return 0; 694 } 695 696 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name, 697 enum bpf_prog_type type) 698 { 699 return ERR_PTR(-EOPNOTSUPP); 700 } 701 #endif /* CONFIG_BPF_SYSCALL */ 702 703 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd, 704 enum bpf_prog_type type) 705 { 706 return bpf_prog_get_type_dev(ufd, type, false); 707 } 708 709 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool); 710 711 int bpf_prog_offload_compile(struct bpf_prog *prog); 712 void bpf_prog_offload_destroy(struct bpf_prog *prog); 713 int bpf_prog_offload_info_fill(struct bpf_prog_info *info, 714 struct bpf_prog *prog); 715 716 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map); 717 718 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value); 719 int bpf_map_offload_update_elem(struct bpf_map *map, 720 void *key, void *value, u64 flags); 721 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key); 722 int bpf_map_offload_get_next_key(struct bpf_map *map, 723 void *key, void *next_key); 724 725 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map); 726 727 struct bpf_offload_dev * 728 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops); 729 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev); 730 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev, 731 struct net_device *netdev); 732 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev, 733 struct net_device *netdev); 734 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev); 735 736 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL) 737 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr); 738 739 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux) 740 { 741 return aux->offload_requested; 742 } 743 744 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 745 { 746 return unlikely(map->ops == &bpf_map_offload_ops); 747 } 748 749 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr); 750 void bpf_map_offload_map_free(struct bpf_map *map); 751 #else 752 static inline int bpf_prog_offload_init(struct bpf_prog *prog, 753 union bpf_attr *attr) 754 { 755 return -EOPNOTSUPP; 756 } 757 758 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux) 759 { 760 return false; 761 } 762 763 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 764 { 765 return false; 766 } 767 768 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr) 769 { 770 return ERR_PTR(-EOPNOTSUPP); 771 } 772 773 static inline void bpf_map_offload_map_free(struct bpf_map *map) 774 { 775 } 776 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */ 777 778 #if defined(CONFIG_BPF_STREAM_PARSER) 779 int sock_map_prog_update(struct bpf_map *map, struct bpf_prog *prog, u32 which); 780 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog); 781 #else 782 static inline int sock_map_prog_update(struct bpf_map *map, 783 struct bpf_prog *prog, u32 which) 784 { 785 return -EOPNOTSUPP; 786 } 787 788 static inline int sock_map_get_from_fd(const union bpf_attr *attr, 789 struct bpf_prog *prog) 790 { 791 return -EINVAL; 792 } 793 #endif 794 795 #if defined(CONFIG_XDP_SOCKETS) 796 struct xdp_sock; 797 struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, u32 key); 798 int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp, 799 struct xdp_sock *xs); 800 void __xsk_map_flush(struct bpf_map *map); 801 #else 802 struct xdp_sock; 803 static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, 804 u32 key) 805 { 806 return NULL; 807 } 808 809 static inline int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp, 810 struct xdp_sock *xs) 811 { 812 return -EOPNOTSUPP; 813 } 814 815 static inline void __xsk_map_flush(struct bpf_map *map) 816 { 817 } 818 #endif 819 820 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) 821 void bpf_sk_reuseport_detach(struct sock *sk); 822 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key, 823 void *value); 824 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key, 825 void *value, u64 map_flags); 826 #else 827 static inline void bpf_sk_reuseport_detach(struct sock *sk) 828 { 829 } 830 831 #ifdef CONFIG_BPF_SYSCALL 832 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, 833 void *key, void *value) 834 { 835 return -EOPNOTSUPP; 836 } 837 838 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, 839 void *key, void *value, 840 u64 map_flags) 841 { 842 return -EOPNOTSUPP; 843 } 844 #endif /* CONFIG_BPF_SYSCALL */ 845 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */ 846 847 /* verifier prototypes for helper functions called from eBPF programs */ 848 extern const struct bpf_func_proto bpf_map_lookup_elem_proto; 849 extern const struct bpf_func_proto bpf_map_update_elem_proto; 850 extern const struct bpf_func_proto bpf_map_delete_elem_proto; 851 extern const struct bpf_func_proto bpf_map_push_elem_proto; 852 extern const struct bpf_func_proto bpf_map_pop_elem_proto; 853 extern const struct bpf_func_proto bpf_map_peek_elem_proto; 854 855 extern const struct bpf_func_proto bpf_get_prandom_u32_proto; 856 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto; 857 extern const struct bpf_func_proto bpf_get_numa_node_id_proto; 858 extern const struct bpf_func_proto bpf_tail_call_proto; 859 extern const struct bpf_func_proto bpf_ktime_get_ns_proto; 860 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto; 861 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto; 862 extern const struct bpf_func_proto bpf_get_current_comm_proto; 863 extern const struct bpf_func_proto bpf_get_stackid_proto; 864 extern const struct bpf_func_proto bpf_get_stack_proto; 865 extern const struct bpf_func_proto bpf_sock_map_update_proto; 866 extern const struct bpf_func_proto bpf_sock_hash_update_proto; 867 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto; 868 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto; 869 extern const struct bpf_func_proto bpf_msg_redirect_map_proto; 870 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto; 871 extern const struct bpf_func_proto bpf_sk_redirect_map_proto; 872 873 extern const struct bpf_func_proto bpf_get_local_storage_proto; 874 875 /* Shared helpers among cBPF and eBPF. */ 876 void bpf_user_rnd_init_once(void); 877 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 878 879 #if defined(CONFIG_NET) 880 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type, 881 struct bpf_insn_access_aux *info); 882 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 883 const struct bpf_insn *si, 884 struct bpf_insn *insn_buf, 885 struct bpf_prog *prog, 886 u32 *target_size); 887 #else 888 static inline bool bpf_sock_is_valid_access(int off, int size, 889 enum bpf_access_type type, 890 struct bpf_insn_access_aux *info) 891 { 892 return false; 893 } 894 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 895 const struct bpf_insn *si, 896 struct bpf_insn *insn_buf, 897 struct bpf_prog *prog, 898 u32 *target_size) 899 { 900 return 0; 901 } 902 #endif 903 904 #endif /* _LINUX_BPF_H */ 905