1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com 3 */ 4 #ifndef _LINUX_BPF_H 5 #define _LINUX_BPF_H 1 6 7 #include <uapi/linux/bpf.h> 8 9 #include <linux/workqueue.h> 10 #include <linux/file.h> 11 #include <linux/percpu.h> 12 #include <linux/err.h> 13 #include <linux/rbtree_latch.h> 14 #include <linux/numa.h> 15 #include <linux/mm_types.h> 16 #include <linux/wait.h> 17 #include <linux/u64_stats_sync.h> 18 #include <linux/refcount.h> 19 #include <linux/mutex.h> 20 #include <linux/module.h> 21 #include <linux/kallsyms.h> 22 #include <linux/capability.h> 23 #include <linux/sched/mm.h> 24 #include <linux/slab.h> 25 26 struct bpf_verifier_env; 27 struct bpf_verifier_log; 28 struct perf_event; 29 struct bpf_prog; 30 struct bpf_prog_aux; 31 struct bpf_map; 32 struct sock; 33 struct seq_file; 34 struct btf; 35 struct btf_type; 36 struct exception_table_entry; 37 struct seq_operations; 38 struct bpf_iter_aux_info; 39 struct bpf_local_storage; 40 struct bpf_local_storage_map; 41 struct kobject; 42 struct mem_cgroup; 43 44 extern struct idr btf_idr; 45 extern spinlock_t btf_idr_lock; 46 extern struct kobject *btf_kobj; 47 48 typedef int (*bpf_iter_init_seq_priv_t)(void *private_data, 49 struct bpf_iter_aux_info *aux); 50 typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data); 51 struct bpf_iter_seq_info { 52 const struct seq_operations *seq_ops; 53 bpf_iter_init_seq_priv_t init_seq_private; 54 bpf_iter_fini_seq_priv_t fini_seq_private; 55 u32 seq_priv_size; 56 }; 57 58 /* map is generic key/value storage optionally accesible by eBPF programs */ 59 struct bpf_map_ops { 60 /* funcs callable from userspace (via syscall) */ 61 int (*map_alloc_check)(union bpf_attr *attr); 62 struct bpf_map *(*map_alloc)(union bpf_attr *attr); 63 void (*map_release)(struct bpf_map *map, struct file *map_file); 64 void (*map_free)(struct bpf_map *map); 65 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key); 66 void (*map_release_uref)(struct bpf_map *map); 67 void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key); 68 int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr, 69 union bpf_attr __user *uattr); 70 int (*map_lookup_and_delete_batch)(struct bpf_map *map, 71 const union bpf_attr *attr, 72 union bpf_attr __user *uattr); 73 int (*map_update_batch)(struct bpf_map *map, const union bpf_attr *attr, 74 union bpf_attr __user *uattr); 75 int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr, 76 union bpf_attr __user *uattr); 77 78 /* funcs callable from userspace and from eBPF programs */ 79 void *(*map_lookup_elem)(struct bpf_map *map, void *key); 80 int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags); 81 int (*map_delete_elem)(struct bpf_map *map, void *key); 82 int (*map_push_elem)(struct bpf_map *map, void *value, u64 flags); 83 int (*map_pop_elem)(struct bpf_map *map, void *value); 84 int (*map_peek_elem)(struct bpf_map *map, void *value); 85 86 /* funcs called by prog_array and perf_event_array map */ 87 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file, 88 int fd); 89 void (*map_fd_put_ptr)(void *ptr); 90 int (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf); 91 u32 (*map_fd_sys_lookup_elem)(void *ptr); 92 void (*map_seq_show_elem)(struct bpf_map *map, void *key, 93 struct seq_file *m); 94 int (*map_check_btf)(const struct bpf_map *map, 95 const struct btf *btf, 96 const struct btf_type *key_type, 97 const struct btf_type *value_type); 98 99 /* Prog poke tracking helpers. */ 100 int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux); 101 void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux); 102 void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old, 103 struct bpf_prog *new); 104 105 /* Direct value access helpers. */ 106 int (*map_direct_value_addr)(const struct bpf_map *map, 107 u64 *imm, u32 off); 108 int (*map_direct_value_meta)(const struct bpf_map *map, 109 u64 imm, u32 *off); 110 int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma); 111 __poll_t (*map_poll)(struct bpf_map *map, struct file *filp, 112 struct poll_table_struct *pts); 113 114 /* Functions called by bpf_local_storage maps */ 115 int (*map_local_storage_charge)(struct bpf_local_storage_map *smap, 116 void *owner, u32 size); 117 void (*map_local_storage_uncharge)(struct bpf_local_storage_map *smap, 118 void *owner, u32 size); 119 struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner); 120 121 /* map_meta_equal must be implemented for maps that can be 122 * used as an inner map. It is a runtime check to ensure 123 * an inner map can be inserted to an outer map. 124 * 125 * Some properties of the inner map has been used during the 126 * verification time. When inserting an inner map at the runtime, 127 * map_meta_equal has to ensure the inserting map has the same 128 * properties that the verifier has used earlier. 129 */ 130 bool (*map_meta_equal)(const struct bpf_map *meta0, 131 const struct bpf_map *meta1); 132 133 /* BTF name and id of struct allocated by map_alloc */ 134 const char * const map_btf_name; 135 int *map_btf_id; 136 137 /* bpf_iter info used to open a seq_file */ 138 const struct bpf_iter_seq_info *iter_seq_info; 139 }; 140 141 struct bpf_map { 142 /* The first two cachelines with read-mostly members of which some 143 * are also accessed in fast-path (e.g. ops, max_entries). 144 */ 145 const struct bpf_map_ops *ops ____cacheline_aligned; 146 struct bpf_map *inner_map_meta; 147 #ifdef CONFIG_SECURITY 148 void *security; 149 #endif 150 enum bpf_map_type map_type; 151 u32 key_size; 152 u32 value_size; 153 u32 max_entries; 154 u32 map_flags; 155 int spin_lock_off; /* >=0 valid offset, <0 error */ 156 u32 id; 157 int numa_node; 158 u32 btf_key_type_id; 159 u32 btf_value_type_id; 160 struct btf *btf; 161 #ifdef CONFIG_MEMCG_KMEM 162 struct mem_cgroup *memcg; 163 #endif 164 char name[BPF_OBJ_NAME_LEN]; 165 u32 btf_vmlinux_value_type_id; 166 bool bypass_spec_v1; 167 bool frozen; /* write-once; write-protected by freeze_mutex */ 168 /* 22 bytes hole */ 169 170 /* The 3rd and 4th cacheline with misc members to avoid false sharing 171 * particularly with refcounting. 172 */ 173 atomic64_t refcnt ____cacheline_aligned; 174 atomic64_t usercnt; 175 struct work_struct work; 176 struct mutex freeze_mutex; 177 u64 writecnt; /* writable mmap cnt; protected by freeze_mutex */ 178 }; 179 180 static inline bool map_value_has_spin_lock(const struct bpf_map *map) 181 { 182 return map->spin_lock_off >= 0; 183 } 184 185 static inline void check_and_init_map_lock(struct bpf_map *map, void *dst) 186 { 187 if (likely(!map_value_has_spin_lock(map))) 188 return; 189 *(struct bpf_spin_lock *)(dst + map->spin_lock_off) = 190 (struct bpf_spin_lock){}; 191 } 192 193 /* copy everything but bpf_spin_lock */ 194 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src) 195 { 196 if (unlikely(map_value_has_spin_lock(map))) { 197 u32 off = map->spin_lock_off; 198 199 memcpy(dst, src, off); 200 memcpy(dst + off + sizeof(struct bpf_spin_lock), 201 src + off + sizeof(struct bpf_spin_lock), 202 map->value_size - off - sizeof(struct bpf_spin_lock)); 203 } else { 204 memcpy(dst, src, map->value_size); 205 } 206 } 207 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src, 208 bool lock_src); 209 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size); 210 211 struct bpf_offload_dev; 212 struct bpf_offloaded_map; 213 214 struct bpf_map_dev_ops { 215 int (*map_get_next_key)(struct bpf_offloaded_map *map, 216 void *key, void *next_key); 217 int (*map_lookup_elem)(struct bpf_offloaded_map *map, 218 void *key, void *value); 219 int (*map_update_elem)(struct bpf_offloaded_map *map, 220 void *key, void *value, u64 flags); 221 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key); 222 }; 223 224 struct bpf_offloaded_map { 225 struct bpf_map map; 226 struct net_device *netdev; 227 const struct bpf_map_dev_ops *dev_ops; 228 void *dev_priv; 229 struct list_head offloads; 230 }; 231 232 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map) 233 { 234 return container_of(map, struct bpf_offloaded_map, map); 235 } 236 237 static inline bool bpf_map_offload_neutral(const struct bpf_map *map) 238 { 239 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY; 240 } 241 242 static inline bool bpf_map_support_seq_show(const struct bpf_map *map) 243 { 244 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) && 245 map->ops->map_seq_show_elem; 246 } 247 248 int map_check_no_btf(const struct bpf_map *map, 249 const struct btf *btf, 250 const struct btf_type *key_type, 251 const struct btf_type *value_type); 252 253 bool bpf_map_meta_equal(const struct bpf_map *meta0, 254 const struct bpf_map *meta1); 255 256 extern const struct bpf_map_ops bpf_map_offload_ops; 257 258 /* function argument constraints */ 259 enum bpf_arg_type { 260 ARG_DONTCARE = 0, /* unused argument in helper function */ 261 262 /* the following constraints used to prototype 263 * bpf_map_lookup/update/delete_elem() functions 264 */ 265 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */ 266 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */ 267 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */ 268 ARG_PTR_TO_UNINIT_MAP_VALUE, /* pointer to valid memory used to store a map value */ 269 ARG_PTR_TO_MAP_VALUE_OR_NULL, /* pointer to stack used as map value or NULL */ 270 271 /* the following constraints used to prototype bpf_memcmp() and other 272 * functions that access data on eBPF program stack 273 */ 274 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */ 275 ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */ 276 ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized, 277 * helper function must fill all bytes or clear 278 * them in error case. 279 */ 280 281 ARG_CONST_SIZE, /* number of bytes accessed from memory */ 282 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */ 283 284 ARG_PTR_TO_CTX, /* pointer to context */ 285 ARG_PTR_TO_CTX_OR_NULL, /* pointer to context or NULL */ 286 ARG_ANYTHING, /* any (initialized) argument is ok */ 287 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */ 288 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */ 289 ARG_PTR_TO_INT, /* pointer to int */ 290 ARG_PTR_TO_LONG, /* pointer to long */ 291 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */ 292 ARG_PTR_TO_SOCKET_OR_NULL, /* pointer to bpf_sock (fullsock) or NULL */ 293 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */ 294 ARG_PTR_TO_ALLOC_MEM, /* pointer to dynamically allocated memory */ 295 ARG_PTR_TO_ALLOC_MEM_OR_NULL, /* pointer to dynamically allocated memory or NULL */ 296 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */ 297 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */ 298 ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */ 299 __BPF_ARG_TYPE_MAX, 300 }; 301 302 /* type of values returned from helper functions */ 303 enum bpf_return_type { 304 RET_INTEGER, /* function returns integer */ 305 RET_VOID, /* function doesn't return anything */ 306 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */ 307 RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */ 308 RET_PTR_TO_SOCKET_OR_NULL, /* returns a pointer to a socket or NULL */ 309 RET_PTR_TO_TCP_SOCK_OR_NULL, /* returns a pointer to a tcp_sock or NULL */ 310 RET_PTR_TO_SOCK_COMMON_OR_NULL, /* returns a pointer to a sock_common or NULL */ 311 RET_PTR_TO_ALLOC_MEM_OR_NULL, /* returns a pointer to dynamically allocated memory or NULL */ 312 RET_PTR_TO_BTF_ID_OR_NULL, /* returns a pointer to a btf_id or NULL */ 313 RET_PTR_TO_MEM_OR_BTF_ID_OR_NULL, /* returns a pointer to a valid memory or a btf_id or NULL */ 314 RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */ 315 RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */ 316 }; 317 318 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs 319 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL 320 * instructions after verifying 321 */ 322 struct bpf_func_proto { 323 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 324 bool gpl_only; 325 bool pkt_access; 326 enum bpf_return_type ret_type; 327 union { 328 struct { 329 enum bpf_arg_type arg1_type; 330 enum bpf_arg_type arg2_type; 331 enum bpf_arg_type arg3_type; 332 enum bpf_arg_type arg4_type; 333 enum bpf_arg_type arg5_type; 334 }; 335 enum bpf_arg_type arg_type[5]; 336 }; 337 union { 338 struct { 339 u32 *arg1_btf_id; 340 u32 *arg2_btf_id; 341 u32 *arg3_btf_id; 342 u32 *arg4_btf_id; 343 u32 *arg5_btf_id; 344 }; 345 u32 *arg_btf_id[5]; 346 }; 347 int *ret_btf_id; /* return value btf_id */ 348 bool (*allowed)(const struct bpf_prog *prog); 349 }; 350 351 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is 352 * the first argument to eBPF programs. 353 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *' 354 */ 355 struct bpf_context; 356 357 enum bpf_access_type { 358 BPF_READ = 1, 359 BPF_WRITE = 2 360 }; 361 362 /* types of values stored in eBPF registers */ 363 /* Pointer types represent: 364 * pointer 365 * pointer + imm 366 * pointer + (u16) var 367 * pointer + (u16) var + imm 368 * if (range > 0) then [ptr, ptr + range - off) is safe to access 369 * if (id > 0) means that some 'var' was added 370 * if (off > 0) means that 'imm' was added 371 */ 372 enum bpf_reg_type { 373 NOT_INIT = 0, /* nothing was written into register */ 374 SCALAR_VALUE, /* reg doesn't contain a valid pointer */ 375 PTR_TO_CTX, /* reg points to bpf_context */ 376 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */ 377 PTR_TO_MAP_VALUE, /* reg points to map element value */ 378 PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */ 379 PTR_TO_STACK, /* reg == frame_pointer + offset */ 380 PTR_TO_PACKET_META, /* skb->data - meta_len */ 381 PTR_TO_PACKET, /* reg points to skb->data */ 382 PTR_TO_PACKET_END, /* skb->data + headlen */ 383 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */ 384 PTR_TO_SOCKET, /* reg points to struct bpf_sock */ 385 PTR_TO_SOCKET_OR_NULL, /* reg points to struct bpf_sock or NULL */ 386 PTR_TO_SOCK_COMMON, /* reg points to sock_common */ 387 PTR_TO_SOCK_COMMON_OR_NULL, /* reg points to sock_common or NULL */ 388 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */ 389 PTR_TO_TCP_SOCK_OR_NULL, /* reg points to struct tcp_sock or NULL */ 390 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */ 391 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */ 392 /* PTR_TO_BTF_ID points to a kernel struct that does not need 393 * to be null checked by the BPF program. This does not imply the 394 * pointer is _not_ null and in practice this can easily be a null 395 * pointer when reading pointer chains. The assumption is program 396 * context will handle null pointer dereference typically via fault 397 * handling. The verifier must keep this in mind and can make no 398 * assumptions about null or non-null when doing branch analysis. 399 * Further, when passed into helpers the helpers can not, without 400 * additional context, assume the value is non-null. 401 */ 402 PTR_TO_BTF_ID, 403 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not 404 * been checked for null. Used primarily to inform the verifier 405 * an explicit null check is required for this struct. 406 */ 407 PTR_TO_BTF_ID_OR_NULL, 408 PTR_TO_MEM, /* reg points to valid memory region */ 409 PTR_TO_MEM_OR_NULL, /* reg points to valid memory region or NULL */ 410 PTR_TO_RDONLY_BUF, /* reg points to a readonly buffer */ 411 PTR_TO_RDONLY_BUF_OR_NULL, /* reg points to a readonly buffer or NULL */ 412 PTR_TO_RDWR_BUF, /* reg points to a read/write buffer */ 413 PTR_TO_RDWR_BUF_OR_NULL, /* reg points to a read/write buffer or NULL */ 414 PTR_TO_PERCPU_BTF_ID, /* reg points to a percpu kernel variable */ 415 }; 416 417 /* The information passed from prog-specific *_is_valid_access 418 * back to the verifier. 419 */ 420 struct bpf_insn_access_aux { 421 enum bpf_reg_type reg_type; 422 union { 423 int ctx_field_size; 424 struct { 425 struct btf *btf; 426 u32 btf_id; 427 }; 428 }; 429 struct bpf_verifier_log *log; /* for verbose logs */ 430 }; 431 432 static inline void 433 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size) 434 { 435 aux->ctx_field_size = size; 436 } 437 438 struct bpf_prog_ops { 439 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr, 440 union bpf_attr __user *uattr); 441 }; 442 443 struct bpf_verifier_ops { 444 /* return eBPF function prototype for verification */ 445 const struct bpf_func_proto * 446 (*get_func_proto)(enum bpf_func_id func_id, 447 const struct bpf_prog *prog); 448 449 /* return true if 'size' wide access at offset 'off' within bpf_context 450 * with 'type' (read or write) is allowed 451 */ 452 bool (*is_valid_access)(int off, int size, enum bpf_access_type type, 453 const struct bpf_prog *prog, 454 struct bpf_insn_access_aux *info); 455 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write, 456 const struct bpf_prog *prog); 457 int (*gen_ld_abs)(const struct bpf_insn *orig, 458 struct bpf_insn *insn_buf); 459 u32 (*convert_ctx_access)(enum bpf_access_type type, 460 const struct bpf_insn *src, 461 struct bpf_insn *dst, 462 struct bpf_prog *prog, u32 *target_size); 463 int (*btf_struct_access)(struct bpf_verifier_log *log, 464 const struct btf *btf, 465 const struct btf_type *t, int off, int size, 466 enum bpf_access_type atype, 467 u32 *next_btf_id); 468 }; 469 470 struct bpf_prog_offload_ops { 471 /* verifier basic callbacks */ 472 int (*insn_hook)(struct bpf_verifier_env *env, 473 int insn_idx, int prev_insn_idx); 474 int (*finalize)(struct bpf_verifier_env *env); 475 /* verifier optimization callbacks (called after .finalize) */ 476 int (*replace_insn)(struct bpf_verifier_env *env, u32 off, 477 struct bpf_insn *insn); 478 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt); 479 /* program management callbacks */ 480 int (*prepare)(struct bpf_prog *prog); 481 int (*translate)(struct bpf_prog *prog); 482 void (*destroy)(struct bpf_prog *prog); 483 }; 484 485 struct bpf_prog_offload { 486 struct bpf_prog *prog; 487 struct net_device *netdev; 488 struct bpf_offload_dev *offdev; 489 void *dev_priv; 490 struct list_head offloads; 491 bool dev_state; 492 bool opt_failed; 493 void *jited_image; 494 u32 jited_len; 495 }; 496 497 enum bpf_cgroup_storage_type { 498 BPF_CGROUP_STORAGE_SHARED, 499 BPF_CGROUP_STORAGE_PERCPU, 500 __BPF_CGROUP_STORAGE_MAX 501 }; 502 503 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX 504 505 /* The longest tracepoint has 12 args. 506 * See include/trace/bpf_probe.h 507 */ 508 #define MAX_BPF_FUNC_ARGS 12 509 510 struct bpf_prog_stats { 511 u64 cnt; 512 u64 nsecs; 513 struct u64_stats_sync syncp; 514 } __aligned(2 * sizeof(u64)); 515 516 struct btf_func_model { 517 u8 ret_size; 518 u8 nr_args; 519 u8 arg_size[MAX_BPF_FUNC_ARGS]; 520 }; 521 522 /* Restore arguments before returning from trampoline to let original function 523 * continue executing. This flag is used for fentry progs when there are no 524 * fexit progs. 525 */ 526 #define BPF_TRAMP_F_RESTORE_REGS BIT(0) 527 /* Call original function after fentry progs, but before fexit progs. 528 * Makes sense for fentry/fexit, normal calls and indirect calls. 529 */ 530 #define BPF_TRAMP_F_CALL_ORIG BIT(1) 531 /* Skip current frame and return to parent. Makes sense for fentry/fexit 532 * programs only. Should not be used with normal calls and indirect calls. 533 */ 534 #define BPF_TRAMP_F_SKIP_FRAME BIT(2) 535 536 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50 537 * bytes on x86. Pick a number to fit into BPF_IMAGE_SIZE / 2 538 */ 539 #define BPF_MAX_TRAMP_PROGS 40 540 541 struct bpf_tramp_progs { 542 struct bpf_prog *progs[BPF_MAX_TRAMP_PROGS]; 543 int nr_progs; 544 }; 545 546 /* Different use cases for BPF trampoline: 547 * 1. replace nop at the function entry (kprobe equivalent) 548 * flags = BPF_TRAMP_F_RESTORE_REGS 549 * fentry = a set of programs to run before returning from trampoline 550 * 551 * 2. replace nop at the function entry (kprobe + kretprobe equivalent) 552 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME 553 * orig_call = fentry_ip + MCOUNT_INSN_SIZE 554 * fentry = a set of program to run before calling original function 555 * fexit = a set of program to run after original function 556 * 557 * 3. replace direct call instruction anywhere in the function body 558 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid) 559 * With flags = 0 560 * fentry = a set of programs to run before returning from trampoline 561 * With flags = BPF_TRAMP_F_CALL_ORIG 562 * orig_call = original callback addr or direct function addr 563 * fentry = a set of program to run before calling original function 564 * fexit = a set of program to run after original function 565 */ 566 int arch_prepare_bpf_trampoline(void *image, void *image_end, 567 const struct btf_func_model *m, u32 flags, 568 struct bpf_tramp_progs *tprogs, 569 void *orig_call); 570 /* these two functions are called from generated trampoline */ 571 u64 notrace __bpf_prog_enter(void); 572 void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start); 573 void notrace __bpf_prog_enter_sleepable(void); 574 void notrace __bpf_prog_exit_sleepable(void); 575 576 struct bpf_ksym { 577 unsigned long start; 578 unsigned long end; 579 char name[KSYM_NAME_LEN]; 580 struct list_head lnode; 581 struct latch_tree_node tnode; 582 bool prog; 583 }; 584 585 enum bpf_tramp_prog_type { 586 BPF_TRAMP_FENTRY, 587 BPF_TRAMP_FEXIT, 588 BPF_TRAMP_MODIFY_RETURN, 589 BPF_TRAMP_MAX, 590 BPF_TRAMP_REPLACE, /* more than MAX */ 591 }; 592 593 struct bpf_trampoline { 594 /* hlist for trampoline_table */ 595 struct hlist_node hlist; 596 /* serializes access to fields of this trampoline */ 597 struct mutex mutex; 598 refcount_t refcnt; 599 u64 key; 600 struct { 601 struct btf_func_model model; 602 void *addr; 603 bool ftrace_managed; 604 } func; 605 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF 606 * program by replacing one of its functions. func.addr is the address 607 * of the function it replaced. 608 */ 609 struct bpf_prog *extension_prog; 610 /* list of BPF programs using this trampoline */ 611 struct hlist_head progs_hlist[BPF_TRAMP_MAX]; 612 /* Number of attached programs. A counter per kind. */ 613 int progs_cnt[BPF_TRAMP_MAX]; 614 /* Executable image of trampoline */ 615 void *image; 616 u64 selector; 617 struct bpf_ksym ksym; 618 }; 619 620 struct bpf_attach_target_info { 621 struct btf_func_model fmodel; 622 long tgt_addr; 623 const char *tgt_name; 624 const struct btf_type *tgt_type; 625 }; 626 627 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */ 628 629 struct bpf_dispatcher_prog { 630 struct bpf_prog *prog; 631 refcount_t users; 632 }; 633 634 struct bpf_dispatcher { 635 /* dispatcher mutex */ 636 struct mutex mutex; 637 void *func; 638 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX]; 639 int num_progs; 640 void *image; 641 u32 image_off; 642 struct bpf_ksym ksym; 643 }; 644 645 static __always_inline unsigned int bpf_dispatcher_nop_func( 646 const void *ctx, 647 const struct bpf_insn *insnsi, 648 unsigned int (*bpf_func)(const void *, 649 const struct bpf_insn *)) 650 { 651 return bpf_func(ctx, insnsi); 652 } 653 #ifdef CONFIG_BPF_JIT 654 int bpf_trampoline_link_prog(struct bpf_prog *prog, struct bpf_trampoline *tr); 655 int bpf_trampoline_unlink_prog(struct bpf_prog *prog, struct bpf_trampoline *tr); 656 struct bpf_trampoline *bpf_trampoline_get(u64 key, 657 struct bpf_attach_target_info *tgt_info); 658 void bpf_trampoline_put(struct bpf_trampoline *tr); 659 #define BPF_DISPATCHER_INIT(_name) { \ 660 .mutex = __MUTEX_INITIALIZER(_name.mutex), \ 661 .func = &_name##_func, \ 662 .progs = {}, \ 663 .num_progs = 0, \ 664 .image = NULL, \ 665 .image_off = 0, \ 666 .ksym = { \ 667 .name = #_name, \ 668 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \ 669 }, \ 670 } 671 672 #define DEFINE_BPF_DISPATCHER(name) \ 673 noinline unsigned int bpf_dispatcher_##name##_func( \ 674 const void *ctx, \ 675 const struct bpf_insn *insnsi, \ 676 unsigned int (*bpf_func)(const void *, \ 677 const struct bpf_insn *)) \ 678 { \ 679 return bpf_func(ctx, insnsi); \ 680 } \ 681 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \ 682 struct bpf_dispatcher bpf_dispatcher_##name = \ 683 BPF_DISPATCHER_INIT(bpf_dispatcher_##name); 684 #define DECLARE_BPF_DISPATCHER(name) \ 685 unsigned int bpf_dispatcher_##name##_func( \ 686 const void *ctx, \ 687 const struct bpf_insn *insnsi, \ 688 unsigned int (*bpf_func)(const void *, \ 689 const struct bpf_insn *)); \ 690 extern struct bpf_dispatcher bpf_dispatcher_##name; 691 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func 692 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name) 693 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from, 694 struct bpf_prog *to); 695 /* Called only from JIT-enabled code, so there's no need for stubs. */ 696 void *bpf_jit_alloc_exec_page(void); 697 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym); 698 void bpf_image_ksym_del(struct bpf_ksym *ksym); 699 void bpf_ksym_add(struct bpf_ksym *ksym); 700 void bpf_ksym_del(struct bpf_ksym *ksym); 701 #else 702 static inline int bpf_trampoline_link_prog(struct bpf_prog *prog, 703 struct bpf_trampoline *tr) 704 { 705 return -ENOTSUPP; 706 } 707 static inline int bpf_trampoline_unlink_prog(struct bpf_prog *prog, 708 struct bpf_trampoline *tr) 709 { 710 return -ENOTSUPP; 711 } 712 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key, 713 struct bpf_attach_target_info *tgt_info) 714 { 715 return ERR_PTR(-EOPNOTSUPP); 716 } 717 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {} 718 #define DEFINE_BPF_DISPATCHER(name) 719 #define DECLARE_BPF_DISPATCHER(name) 720 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func 721 #define BPF_DISPATCHER_PTR(name) NULL 722 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, 723 struct bpf_prog *from, 724 struct bpf_prog *to) {} 725 static inline bool is_bpf_image_address(unsigned long address) 726 { 727 return false; 728 } 729 #endif 730 731 struct bpf_func_info_aux { 732 u16 linkage; 733 bool unreliable; 734 }; 735 736 enum bpf_jit_poke_reason { 737 BPF_POKE_REASON_TAIL_CALL, 738 }; 739 740 /* Descriptor of pokes pointing /into/ the JITed image. */ 741 struct bpf_jit_poke_descriptor { 742 void *tailcall_target; 743 void *tailcall_bypass; 744 void *bypass_addr; 745 union { 746 struct { 747 struct bpf_map *map; 748 u32 key; 749 } tail_call; 750 }; 751 bool tailcall_target_stable; 752 u8 adj_off; 753 u16 reason; 754 u32 insn_idx; 755 }; 756 757 /* reg_type info for ctx arguments */ 758 struct bpf_ctx_arg_aux { 759 u32 offset; 760 enum bpf_reg_type reg_type; 761 u32 btf_id; 762 }; 763 764 struct bpf_prog_aux { 765 atomic64_t refcnt; 766 u32 used_map_cnt; 767 u32 max_ctx_offset; 768 u32 max_pkt_offset; 769 u32 max_tp_access; 770 u32 stack_depth; 771 u32 id; 772 u32 func_cnt; /* used by non-func prog as the number of func progs */ 773 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */ 774 u32 attach_btf_id; /* in-kernel BTF type id to attach to */ 775 u32 ctx_arg_info_size; 776 u32 max_rdonly_access; 777 u32 max_rdwr_access; 778 struct btf *attach_btf; 779 const struct bpf_ctx_arg_aux *ctx_arg_info; 780 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */ 781 struct bpf_prog *dst_prog; 782 struct bpf_trampoline *dst_trampoline; 783 enum bpf_prog_type saved_dst_prog_type; 784 enum bpf_attach_type saved_dst_attach_type; 785 bool verifier_zext; /* Zero extensions has been inserted by verifier. */ 786 bool offload_requested; 787 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */ 788 bool func_proto_unreliable; 789 bool sleepable; 790 bool tail_call_reachable; 791 enum bpf_tramp_prog_type trampoline_prog_type; 792 struct hlist_node tramp_hlist; 793 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */ 794 const struct btf_type *attach_func_proto; 795 /* function name for valid attach_btf_id */ 796 const char *attach_func_name; 797 struct bpf_prog **func; 798 void *jit_data; /* JIT specific data. arch dependent */ 799 struct bpf_jit_poke_descriptor *poke_tab; 800 u32 size_poke_tab; 801 struct bpf_ksym ksym; 802 const struct bpf_prog_ops *ops; 803 struct bpf_map **used_maps; 804 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */ 805 struct bpf_prog *prog; 806 struct user_struct *user; 807 u64 load_time; /* ns since boottime */ 808 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]; 809 char name[BPF_OBJ_NAME_LEN]; 810 #ifdef CONFIG_SECURITY 811 void *security; 812 #endif 813 struct bpf_prog_offload *offload; 814 struct btf *btf; 815 struct bpf_func_info *func_info; 816 struct bpf_func_info_aux *func_info_aux; 817 /* bpf_line_info loaded from userspace. linfo->insn_off 818 * has the xlated insn offset. 819 * Both the main and sub prog share the same linfo. 820 * The subprog can access its first linfo by 821 * using the linfo_idx. 822 */ 823 struct bpf_line_info *linfo; 824 /* jited_linfo is the jited addr of the linfo. It has a 825 * one to one mapping to linfo: 826 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off. 827 * Both the main and sub prog share the same jited_linfo. 828 * The subprog can access its first jited_linfo by 829 * using the linfo_idx. 830 */ 831 void **jited_linfo; 832 u32 func_info_cnt; 833 u32 nr_linfo; 834 /* subprog can use linfo_idx to access its first linfo and 835 * jited_linfo. 836 * main prog always has linfo_idx == 0 837 */ 838 u32 linfo_idx; 839 u32 num_exentries; 840 struct exception_table_entry *extable; 841 struct bpf_prog_stats __percpu *stats; 842 union { 843 struct work_struct work; 844 struct rcu_head rcu; 845 }; 846 }; 847 848 struct bpf_array_aux { 849 /* 'Ownership' of prog array is claimed by the first program that 850 * is going to use this map or by the first program which FD is 851 * stored in the map to make sure that all callers and callees have 852 * the same prog type and JITed flag. 853 */ 854 enum bpf_prog_type type; 855 bool jited; 856 /* Programs with direct jumps into programs part of this array. */ 857 struct list_head poke_progs; 858 struct bpf_map *map; 859 struct mutex poke_mutex; 860 struct work_struct work; 861 }; 862 863 struct bpf_link { 864 atomic64_t refcnt; 865 u32 id; 866 enum bpf_link_type type; 867 const struct bpf_link_ops *ops; 868 struct bpf_prog *prog; 869 struct work_struct work; 870 }; 871 872 struct bpf_link_ops { 873 void (*release)(struct bpf_link *link); 874 void (*dealloc)(struct bpf_link *link); 875 int (*detach)(struct bpf_link *link); 876 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog, 877 struct bpf_prog *old_prog); 878 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq); 879 int (*fill_link_info)(const struct bpf_link *link, 880 struct bpf_link_info *info); 881 }; 882 883 struct bpf_link_primer { 884 struct bpf_link *link; 885 struct file *file; 886 int fd; 887 u32 id; 888 }; 889 890 struct bpf_struct_ops_value; 891 struct btf_type; 892 struct btf_member; 893 894 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64 895 struct bpf_struct_ops { 896 const struct bpf_verifier_ops *verifier_ops; 897 int (*init)(struct btf *btf); 898 int (*check_member)(const struct btf_type *t, 899 const struct btf_member *member); 900 int (*init_member)(const struct btf_type *t, 901 const struct btf_member *member, 902 void *kdata, const void *udata); 903 int (*reg)(void *kdata); 904 void (*unreg)(void *kdata); 905 const struct btf_type *type; 906 const struct btf_type *value_type; 907 const char *name; 908 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS]; 909 u32 type_id; 910 u32 value_id; 911 }; 912 913 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL) 914 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA)) 915 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id); 916 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log); 917 bool bpf_struct_ops_get(const void *kdata); 918 void bpf_struct_ops_put(const void *kdata); 919 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key, 920 void *value); 921 static inline bool bpf_try_module_get(const void *data, struct module *owner) 922 { 923 if (owner == BPF_MODULE_OWNER) 924 return bpf_struct_ops_get(data); 925 else 926 return try_module_get(owner); 927 } 928 static inline void bpf_module_put(const void *data, struct module *owner) 929 { 930 if (owner == BPF_MODULE_OWNER) 931 bpf_struct_ops_put(data); 932 else 933 module_put(owner); 934 } 935 #else 936 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id) 937 { 938 return NULL; 939 } 940 static inline void bpf_struct_ops_init(struct btf *btf, 941 struct bpf_verifier_log *log) 942 { 943 } 944 static inline bool bpf_try_module_get(const void *data, struct module *owner) 945 { 946 return try_module_get(owner); 947 } 948 static inline void bpf_module_put(const void *data, struct module *owner) 949 { 950 module_put(owner); 951 } 952 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, 953 void *key, 954 void *value) 955 { 956 return -EINVAL; 957 } 958 #endif 959 960 struct bpf_array { 961 struct bpf_map map; 962 u32 elem_size; 963 u32 index_mask; 964 struct bpf_array_aux *aux; 965 union { 966 char value[0] __aligned(8); 967 void *ptrs[0] __aligned(8); 968 void __percpu *pptrs[0] __aligned(8); 969 }; 970 }; 971 972 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */ 973 #define MAX_TAIL_CALL_CNT 32 974 975 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \ 976 BPF_F_RDONLY_PROG | \ 977 BPF_F_WRONLY | \ 978 BPF_F_WRONLY_PROG) 979 980 #define BPF_MAP_CAN_READ BIT(0) 981 #define BPF_MAP_CAN_WRITE BIT(1) 982 983 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map) 984 { 985 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG); 986 987 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is 988 * not possible. 989 */ 990 if (access_flags & BPF_F_RDONLY_PROG) 991 return BPF_MAP_CAN_READ; 992 else if (access_flags & BPF_F_WRONLY_PROG) 993 return BPF_MAP_CAN_WRITE; 994 else 995 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE; 996 } 997 998 static inline bool bpf_map_flags_access_ok(u32 access_flags) 999 { 1000 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) != 1001 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG); 1002 } 1003 1004 struct bpf_event_entry { 1005 struct perf_event *event; 1006 struct file *perf_file; 1007 struct file *map_file; 1008 struct rcu_head rcu; 1009 }; 1010 1011 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp); 1012 int bpf_prog_calc_tag(struct bpf_prog *fp); 1013 1014 const struct bpf_func_proto *bpf_get_trace_printk_proto(void); 1015 1016 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src, 1017 unsigned long off, unsigned long len); 1018 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type, 1019 const struct bpf_insn *src, 1020 struct bpf_insn *dst, 1021 struct bpf_prog *prog, 1022 u32 *target_size); 1023 1024 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, 1025 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy); 1026 1027 /* an array of programs to be executed under rcu_lock. 1028 * 1029 * Typical usage: 1030 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN); 1031 * 1032 * the structure returned by bpf_prog_array_alloc() should be populated 1033 * with program pointers and the last pointer must be NULL. 1034 * The user has to keep refcnt on the program and make sure the program 1035 * is removed from the array before bpf_prog_put(). 1036 * The 'struct bpf_prog_array *' should only be replaced with xchg() 1037 * since other cpus are walking the array of pointers in parallel. 1038 */ 1039 struct bpf_prog_array_item { 1040 struct bpf_prog *prog; 1041 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]; 1042 }; 1043 1044 struct bpf_prog_array { 1045 struct rcu_head rcu; 1046 struct bpf_prog_array_item items[]; 1047 }; 1048 1049 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags); 1050 void bpf_prog_array_free(struct bpf_prog_array *progs); 1051 int bpf_prog_array_length(struct bpf_prog_array *progs); 1052 bool bpf_prog_array_is_empty(struct bpf_prog_array *array); 1053 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs, 1054 __u32 __user *prog_ids, u32 cnt); 1055 1056 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs, 1057 struct bpf_prog *old_prog); 1058 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index); 1059 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index, 1060 struct bpf_prog *prog); 1061 int bpf_prog_array_copy_info(struct bpf_prog_array *array, 1062 u32 *prog_ids, u32 request_cnt, 1063 u32 *prog_cnt); 1064 int bpf_prog_array_copy(struct bpf_prog_array *old_array, 1065 struct bpf_prog *exclude_prog, 1066 struct bpf_prog *include_prog, 1067 struct bpf_prog_array **new_array); 1068 1069 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null) \ 1070 ({ \ 1071 struct bpf_prog_array_item *_item; \ 1072 struct bpf_prog *_prog; \ 1073 struct bpf_prog_array *_array; \ 1074 u32 _ret = 1; \ 1075 migrate_disable(); \ 1076 rcu_read_lock(); \ 1077 _array = rcu_dereference(array); \ 1078 if (unlikely(check_non_null && !_array))\ 1079 goto _out; \ 1080 _item = &_array->items[0]; \ 1081 while ((_prog = READ_ONCE(_item->prog))) { \ 1082 bpf_cgroup_storage_set(_item->cgroup_storage); \ 1083 _ret &= func(_prog, ctx); \ 1084 _item++; \ 1085 } \ 1086 _out: \ 1087 rcu_read_unlock(); \ 1088 migrate_enable(); \ 1089 _ret; \ 1090 }) 1091 1092 /* To be used by __cgroup_bpf_run_filter_skb for EGRESS BPF progs 1093 * so BPF programs can request cwr for TCP packets. 1094 * 1095 * Current cgroup skb programs can only return 0 or 1 (0 to drop the 1096 * packet. This macro changes the behavior so the low order bit 1097 * indicates whether the packet should be dropped (0) or not (1) 1098 * and the next bit is a congestion notification bit. This could be 1099 * used by TCP to call tcp_enter_cwr() 1100 * 1101 * Hence, new allowed return values of CGROUP EGRESS BPF programs are: 1102 * 0: drop packet 1103 * 1: keep packet 1104 * 2: drop packet and cn 1105 * 3: keep packet and cn 1106 * 1107 * This macro then converts it to one of the NET_XMIT or an error 1108 * code that is then interpreted as drop packet (and no cn): 1109 * 0: NET_XMIT_SUCCESS skb should be transmitted 1110 * 1: NET_XMIT_DROP skb should be dropped and cn 1111 * 2: NET_XMIT_CN skb should be transmitted and cn 1112 * 3: -EPERM skb should be dropped 1113 */ 1114 #define BPF_PROG_CGROUP_INET_EGRESS_RUN_ARRAY(array, ctx, func) \ 1115 ({ \ 1116 struct bpf_prog_array_item *_item; \ 1117 struct bpf_prog *_prog; \ 1118 struct bpf_prog_array *_array; \ 1119 u32 ret; \ 1120 u32 _ret = 1; \ 1121 u32 _cn = 0; \ 1122 migrate_disable(); \ 1123 rcu_read_lock(); \ 1124 _array = rcu_dereference(array); \ 1125 _item = &_array->items[0]; \ 1126 while ((_prog = READ_ONCE(_item->prog))) { \ 1127 bpf_cgroup_storage_set(_item->cgroup_storage); \ 1128 ret = func(_prog, ctx); \ 1129 _ret &= (ret & 1); \ 1130 _cn |= (ret & 2); \ 1131 _item++; \ 1132 } \ 1133 rcu_read_unlock(); \ 1134 migrate_enable(); \ 1135 if (_ret) \ 1136 _ret = (_cn ? NET_XMIT_CN : NET_XMIT_SUCCESS); \ 1137 else \ 1138 _ret = (_cn ? NET_XMIT_DROP : -EPERM); \ 1139 _ret; \ 1140 }) 1141 1142 #define BPF_PROG_RUN_ARRAY(array, ctx, func) \ 1143 __BPF_PROG_RUN_ARRAY(array, ctx, func, false) 1144 1145 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \ 1146 __BPF_PROG_RUN_ARRAY(array, ctx, func, true) 1147 1148 #ifdef CONFIG_BPF_SYSCALL 1149 DECLARE_PER_CPU(int, bpf_prog_active); 1150 extern struct mutex bpf_stats_enabled_mutex; 1151 1152 /* 1153 * Block execution of BPF programs attached to instrumentation (perf, 1154 * kprobes, tracepoints) to prevent deadlocks on map operations as any of 1155 * these events can happen inside a region which holds a map bucket lock 1156 * and can deadlock on it. 1157 * 1158 * Use the preemption safe inc/dec variants on RT because migrate disable 1159 * is preemptible on RT and preemption in the middle of the RMW operation 1160 * might lead to inconsistent state. Use the raw variants for non RT 1161 * kernels as migrate_disable() maps to preempt_disable() so the slightly 1162 * more expensive save operation can be avoided. 1163 */ 1164 static inline void bpf_disable_instrumentation(void) 1165 { 1166 migrate_disable(); 1167 if (IS_ENABLED(CONFIG_PREEMPT_RT)) 1168 this_cpu_inc(bpf_prog_active); 1169 else 1170 __this_cpu_inc(bpf_prog_active); 1171 } 1172 1173 static inline void bpf_enable_instrumentation(void) 1174 { 1175 if (IS_ENABLED(CONFIG_PREEMPT_RT)) 1176 this_cpu_dec(bpf_prog_active); 1177 else 1178 __this_cpu_dec(bpf_prog_active); 1179 migrate_enable(); 1180 } 1181 1182 extern const struct file_operations bpf_map_fops; 1183 extern const struct file_operations bpf_prog_fops; 1184 extern const struct file_operations bpf_iter_fops; 1185 1186 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \ 1187 extern const struct bpf_prog_ops _name ## _prog_ops; \ 1188 extern const struct bpf_verifier_ops _name ## _verifier_ops; 1189 #define BPF_MAP_TYPE(_id, _ops) \ 1190 extern const struct bpf_map_ops _ops; 1191 #define BPF_LINK_TYPE(_id, _name) 1192 #include <linux/bpf_types.h> 1193 #undef BPF_PROG_TYPE 1194 #undef BPF_MAP_TYPE 1195 #undef BPF_LINK_TYPE 1196 1197 extern const struct bpf_prog_ops bpf_offload_prog_ops; 1198 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops; 1199 extern const struct bpf_verifier_ops xdp_analyzer_ops; 1200 1201 struct bpf_prog *bpf_prog_get(u32 ufd); 1202 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, 1203 bool attach_drv); 1204 void bpf_prog_add(struct bpf_prog *prog, int i); 1205 void bpf_prog_sub(struct bpf_prog *prog, int i); 1206 void bpf_prog_inc(struct bpf_prog *prog); 1207 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog); 1208 void bpf_prog_put(struct bpf_prog *prog); 1209 void __bpf_free_used_maps(struct bpf_prog_aux *aux, 1210 struct bpf_map **used_maps, u32 len); 1211 1212 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock); 1213 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock); 1214 1215 struct bpf_map *bpf_map_get(u32 ufd); 1216 struct bpf_map *bpf_map_get_with_uref(u32 ufd); 1217 struct bpf_map *__bpf_map_get(struct fd f); 1218 void bpf_map_inc(struct bpf_map *map); 1219 void bpf_map_inc_with_uref(struct bpf_map *map); 1220 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map); 1221 void bpf_map_put_with_uref(struct bpf_map *map); 1222 void bpf_map_put(struct bpf_map *map); 1223 void *bpf_map_area_alloc(u64 size, int numa_node); 1224 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node); 1225 void bpf_map_area_free(void *base); 1226 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr); 1227 int generic_map_lookup_batch(struct bpf_map *map, 1228 const union bpf_attr *attr, 1229 union bpf_attr __user *uattr); 1230 int generic_map_update_batch(struct bpf_map *map, 1231 const union bpf_attr *attr, 1232 union bpf_attr __user *uattr); 1233 int generic_map_delete_batch(struct bpf_map *map, 1234 const union bpf_attr *attr, 1235 union bpf_attr __user *uattr); 1236 struct bpf_map *bpf_map_get_curr_or_next(u32 *id); 1237 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id); 1238 1239 #ifdef CONFIG_MEMCG_KMEM 1240 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags, 1241 int node); 1242 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags); 1243 void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, 1244 size_t align, gfp_t flags); 1245 #else 1246 static inline void * 1247 bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags, 1248 int node) 1249 { 1250 return kmalloc_node(size, flags, node); 1251 } 1252 1253 static inline void * 1254 bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags) 1255 { 1256 return kzalloc(size, flags); 1257 } 1258 1259 static inline void __percpu * 1260 bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, size_t align, 1261 gfp_t flags) 1262 { 1263 return __alloc_percpu_gfp(size, align, flags); 1264 } 1265 #endif 1266 1267 extern int sysctl_unprivileged_bpf_disabled; 1268 1269 static inline bool bpf_allow_ptr_leaks(void) 1270 { 1271 return perfmon_capable(); 1272 } 1273 1274 static inline bool bpf_allow_ptr_to_map_access(void) 1275 { 1276 return perfmon_capable(); 1277 } 1278 1279 static inline bool bpf_bypass_spec_v1(void) 1280 { 1281 return perfmon_capable(); 1282 } 1283 1284 static inline bool bpf_bypass_spec_v4(void) 1285 { 1286 return perfmon_capable(); 1287 } 1288 1289 int bpf_map_new_fd(struct bpf_map *map, int flags); 1290 int bpf_prog_new_fd(struct bpf_prog *prog); 1291 1292 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type, 1293 const struct bpf_link_ops *ops, struct bpf_prog *prog); 1294 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer); 1295 int bpf_link_settle(struct bpf_link_primer *primer); 1296 void bpf_link_cleanup(struct bpf_link_primer *primer); 1297 void bpf_link_inc(struct bpf_link *link); 1298 void bpf_link_put(struct bpf_link *link); 1299 int bpf_link_new_fd(struct bpf_link *link); 1300 struct file *bpf_link_new_file(struct bpf_link *link, int *reserved_fd); 1301 struct bpf_link *bpf_link_get_from_fd(u32 ufd); 1302 1303 int bpf_obj_pin_user(u32 ufd, const char __user *pathname); 1304 int bpf_obj_get_user(const char __user *pathname, int flags); 1305 1306 #define BPF_ITER_FUNC_PREFIX "bpf_iter_" 1307 #define DEFINE_BPF_ITER_FUNC(target, args...) \ 1308 extern int bpf_iter_ ## target(args); \ 1309 int __init bpf_iter_ ## target(args) { return 0; } 1310 1311 struct bpf_iter_aux_info { 1312 struct bpf_map *map; 1313 }; 1314 1315 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog, 1316 union bpf_iter_link_info *linfo, 1317 struct bpf_iter_aux_info *aux); 1318 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux); 1319 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux, 1320 struct seq_file *seq); 1321 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux, 1322 struct bpf_link_info *info); 1323 1324 enum bpf_iter_feature { 1325 BPF_ITER_RESCHED = BIT(0), 1326 }; 1327 1328 #define BPF_ITER_CTX_ARG_MAX 2 1329 struct bpf_iter_reg { 1330 const char *target; 1331 bpf_iter_attach_target_t attach_target; 1332 bpf_iter_detach_target_t detach_target; 1333 bpf_iter_show_fdinfo_t show_fdinfo; 1334 bpf_iter_fill_link_info_t fill_link_info; 1335 u32 ctx_arg_info_size; 1336 u32 feature; 1337 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX]; 1338 const struct bpf_iter_seq_info *seq_info; 1339 }; 1340 1341 struct bpf_iter_meta { 1342 __bpf_md_ptr(struct seq_file *, seq); 1343 u64 session_id; 1344 u64 seq_num; 1345 }; 1346 1347 struct bpf_iter__bpf_map_elem { 1348 __bpf_md_ptr(struct bpf_iter_meta *, meta); 1349 __bpf_md_ptr(struct bpf_map *, map); 1350 __bpf_md_ptr(void *, key); 1351 __bpf_md_ptr(void *, value); 1352 }; 1353 1354 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info); 1355 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info); 1356 bool bpf_iter_prog_supported(struct bpf_prog *prog); 1357 int bpf_iter_link_attach(const union bpf_attr *attr, struct bpf_prog *prog); 1358 int bpf_iter_new_fd(struct bpf_link *link); 1359 bool bpf_link_is_iter(struct bpf_link *link); 1360 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop); 1361 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx); 1362 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux, 1363 struct seq_file *seq); 1364 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux, 1365 struct bpf_link_info *info); 1366 1367 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value); 1368 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value); 1369 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value, 1370 u64 flags); 1371 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value, 1372 u64 flags); 1373 1374 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value); 1375 1376 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file, 1377 void *key, void *value, u64 map_flags); 1378 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 1379 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file, 1380 void *key, void *value, u64 map_flags); 1381 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 1382 1383 int bpf_get_file_flag(int flags); 1384 int bpf_check_uarg_tail_zero(void __user *uaddr, size_t expected_size, 1385 size_t actual_size); 1386 1387 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and 1388 * forced to use 'long' read/writes to try to atomically copy long counters. 1389 * Best-effort only. No barriers here, since it _will_ race with concurrent 1390 * updates from BPF programs. Called from bpf syscall and mostly used with 1391 * size 8 or 16 bytes, so ask compiler to inline it. 1392 */ 1393 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size) 1394 { 1395 const long *lsrc = src; 1396 long *ldst = dst; 1397 1398 size /= sizeof(long); 1399 while (size--) 1400 *ldst++ = *lsrc++; 1401 } 1402 1403 /* verify correctness of eBPF program */ 1404 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, 1405 union bpf_attr __user *uattr); 1406 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth); 1407 1408 struct btf *bpf_get_btf_vmlinux(void); 1409 1410 /* Map specifics */ 1411 struct xdp_buff; 1412 struct sk_buff; 1413 1414 struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key); 1415 struct bpf_dtab_netdev *__dev_map_hash_lookup_elem(struct bpf_map *map, u32 key); 1416 void __dev_flush(void); 1417 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp, 1418 struct net_device *dev_rx); 1419 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, 1420 struct net_device *dev_rx); 1421 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb, 1422 struct bpf_prog *xdp_prog); 1423 bool dev_map_can_have_prog(struct bpf_map *map); 1424 1425 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key); 1426 void __cpu_map_flush(void); 1427 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp, 1428 struct net_device *dev_rx); 1429 bool cpu_map_prog_allowed(struct bpf_map *map); 1430 1431 /* Return map's numa specified by userspace */ 1432 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr) 1433 { 1434 return (attr->map_flags & BPF_F_NUMA_NODE) ? 1435 attr->numa_node : NUMA_NO_NODE; 1436 } 1437 1438 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type); 1439 int array_map_alloc_check(union bpf_attr *attr); 1440 1441 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, 1442 union bpf_attr __user *uattr); 1443 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, 1444 union bpf_attr __user *uattr); 1445 int bpf_prog_test_run_tracing(struct bpf_prog *prog, 1446 const union bpf_attr *kattr, 1447 union bpf_attr __user *uattr); 1448 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, 1449 const union bpf_attr *kattr, 1450 union bpf_attr __user *uattr); 1451 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog, 1452 const union bpf_attr *kattr, 1453 union bpf_attr __user *uattr); 1454 bool btf_ctx_access(int off, int size, enum bpf_access_type type, 1455 const struct bpf_prog *prog, 1456 struct bpf_insn_access_aux *info); 1457 int btf_struct_access(struct bpf_verifier_log *log, const struct btf *btf, 1458 const struct btf_type *t, int off, int size, 1459 enum bpf_access_type atype, 1460 u32 *next_btf_id); 1461 bool btf_struct_ids_match(struct bpf_verifier_log *log, 1462 const struct btf *btf, u32 id, int off, 1463 const struct btf *need_btf, u32 need_type_id); 1464 1465 int btf_distill_func_proto(struct bpf_verifier_log *log, 1466 struct btf *btf, 1467 const struct btf_type *func_proto, 1468 const char *func_name, 1469 struct btf_func_model *m); 1470 1471 struct bpf_reg_state; 1472 int btf_check_func_arg_match(struct bpf_verifier_env *env, int subprog, 1473 struct bpf_reg_state *regs); 1474 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog, 1475 struct bpf_reg_state *reg); 1476 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog, 1477 struct btf *btf, const struct btf_type *t); 1478 1479 struct bpf_prog *bpf_prog_by_id(u32 id); 1480 struct bpf_link *bpf_link_by_id(u32 id); 1481 1482 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id); 1483 #else /* !CONFIG_BPF_SYSCALL */ 1484 static inline struct bpf_prog *bpf_prog_get(u32 ufd) 1485 { 1486 return ERR_PTR(-EOPNOTSUPP); 1487 } 1488 1489 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, 1490 enum bpf_prog_type type, 1491 bool attach_drv) 1492 { 1493 return ERR_PTR(-EOPNOTSUPP); 1494 } 1495 1496 static inline void bpf_prog_add(struct bpf_prog *prog, int i) 1497 { 1498 } 1499 1500 static inline void bpf_prog_sub(struct bpf_prog *prog, int i) 1501 { 1502 } 1503 1504 static inline void bpf_prog_put(struct bpf_prog *prog) 1505 { 1506 } 1507 1508 static inline void bpf_prog_inc(struct bpf_prog *prog) 1509 { 1510 } 1511 1512 static inline struct bpf_prog *__must_check 1513 bpf_prog_inc_not_zero(struct bpf_prog *prog) 1514 { 1515 return ERR_PTR(-EOPNOTSUPP); 1516 } 1517 1518 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type, 1519 const struct bpf_link_ops *ops, 1520 struct bpf_prog *prog) 1521 { 1522 } 1523 1524 static inline int bpf_link_prime(struct bpf_link *link, 1525 struct bpf_link_primer *primer) 1526 { 1527 return -EOPNOTSUPP; 1528 } 1529 1530 static inline int bpf_link_settle(struct bpf_link_primer *primer) 1531 { 1532 return -EOPNOTSUPP; 1533 } 1534 1535 static inline void bpf_link_cleanup(struct bpf_link_primer *primer) 1536 { 1537 } 1538 1539 static inline void bpf_link_inc(struct bpf_link *link) 1540 { 1541 } 1542 1543 static inline void bpf_link_put(struct bpf_link *link) 1544 { 1545 } 1546 1547 static inline int bpf_obj_get_user(const char __user *pathname, int flags) 1548 { 1549 return -EOPNOTSUPP; 1550 } 1551 1552 static inline struct net_device *__dev_map_lookup_elem(struct bpf_map *map, 1553 u32 key) 1554 { 1555 return NULL; 1556 } 1557 1558 static inline struct net_device *__dev_map_hash_lookup_elem(struct bpf_map *map, 1559 u32 key) 1560 { 1561 return NULL; 1562 } 1563 static inline bool dev_map_can_have_prog(struct bpf_map *map) 1564 { 1565 return false; 1566 } 1567 1568 static inline void __dev_flush(void) 1569 { 1570 } 1571 1572 struct xdp_buff; 1573 struct bpf_dtab_netdev; 1574 1575 static inline 1576 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp, 1577 struct net_device *dev_rx) 1578 { 1579 return 0; 1580 } 1581 1582 static inline 1583 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, 1584 struct net_device *dev_rx) 1585 { 1586 return 0; 1587 } 1588 1589 struct sk_buff; 1590 1591 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, 1592 struct sk_buff *skb, 1593 struct bpf_prog *xdp_prog) 1594 { 1595 return 0; 1596 } 1597 1598 static inline 1599 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key) 1600 { 1601 return NULL; 1602 } 1603 1604 static inline void __cpu_map_flush(void) 1605 { 1606 } 1607 1608 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, 1609 struct xdp_buff *xdp, 1610 struct net_device *dev_rx) 1611 { 1612 return 0; 1613 } 1614 1615 static inline bool cpu_map_prog_allowed(struct bpf_map *map) 1616 { 1617 return false; 1618 } 1619 1620 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name, 1621 enum bpf_prog_type type) 1622 { 1623 return ERR_PTR(-EOPNOTSUPP); 1624 } 1625 1626 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog, 1627 const union bpf_attr *kattr, 1628 union bpf_attr __user *uattr) 1629 { 1630 return -ENOTSUPP; 1631 } 1632 1633 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog, 1634 const union bpf_attr *kattr, 1635 union bpf_attr __user *uattr) 1636 { 1637 return -ENOTSUPP; 1638 } 1639 1640 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog, 1641 const union bpf_attr *kattr, 1642 union bpf_attr __user *uattr) 1643 { 1644 return -ENOTSUPP; 1645 } 1646 1647 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, 1648 const union bpf_attr *kattr, 1649 union bpf_attr __user *uattr) 1650 { 1651 return -ENOTSUPP; 1652 } 1653 1654 static inline void bpf_map_put(struct bpf_map *map) 1655 { 1656 } 1657 1658 static inline struct bpf_prog *bpf_prog_by_id(u32 id) 1659 { 1660 return ERR_PTR(-ENOTSUPP); 1661 } 1662 1663 static inline const struct bpf_func_proto * 1664 bpf_base_func_proto(enum bpf_func_id func_id) 1665 { 1666 return NULL; 1667 } 1668 #endif /* CONFIG_BPF_SYSCALL */ 1669 1670 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd, 1671 enum bpf_prog_type type) 1672 { 1673 return bpf_prog_get_type_dev(ufd, type, false); 1674 } 1675 1676 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool); 1677 1678 int bpf_prog_offload_compile(struct bpf_prog *prog); 1679 void bpf_prog_offload_destroy(struct bpf_prog *prog); 1680 int bpf_prog_offload_info_fill(struct bpf_prog_info *info, 1681 struct bpf_prog *prog); 1682 1683 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map); 1684 1685 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value); 1686 int bpf_map_offload_update_elem(struct bpf_map *map, 1687 void *key, void *value, u64 flags); 1688 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key); 1689 int bpf_map_offload_get_next_key(struct bpf_map *map, 1690 void *key, void *next_key); 1691 1692 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map); 1693 1694 struct bpf_offload_dev * 1695 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv); 1696 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev); 1697 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev); 1698 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev, 1699 struct net_device *netdev); 1700 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev, 1701 struct net_device *netdev); 1702 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev); 1703 1704 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL) 1705 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr); 1706 1707 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux) 1708 { 1709 return aux->offload_requested; 1710 } 1711 1712 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 1713 { 1714 return unlikely(map->ops == &bpf_map_offload_ops); 1715 } 1716 1717 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr); 1718 void bpf_map_offload_map_free(struct bpf_map *map); 1719 #else 1720 static inline int bpf_prog_offload_init(struct bpf_prog *prog, 1721 union bpf_attr *attr) 1722 { 1723 return -EOPNOTSUPP; 1724 } 1725 1726 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux) 1727 { 1728 return false; 1729 } 1730 1731 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 1732 { 1733 return false; 1734 } 1735 1736 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr) 1737 { 1738 return ERR_PTR(-EOPNOTSUPP); 1739 } 1740 1741 static inline void bpf_map_offload_map_free(struct bpf_map *map) 1742 { 1743 } 1744 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */ 1745 1746 #if defined(CONFIG_BPF_STREAM_PARSER) 1747 int sock_map_prog_update(struct bpf_map *map, struct bpf_prog *prog, 1748 struct bpf_prog *old, u32 which); 1749 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog); 1750 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype); 1751 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags); 1752 void sock_map_unhash(struct sock *sk); 1753 void sock_map_close(struct sock *sk, long timeout); 1754 #else 1755 static inline int sock_map_prog_update(struct bpf_map *map, 1756 struct bpf_prog *prog, 1757 struct bpf_prog *old, u32 which) 1758 { 1759 return -EOPNOTSUPP; 1760 } 1761 1762 static inline int sock_map_get_from_fd(const union bpf_attr *attr, 1763 struct bpf_prog *prog) 1764 { 1765 return -EINVAL; 1766 } 1767 1768 static inline int sock_map_prog_detach(const union bpf_attr *attr, 1769 enum bpf_prog_type ptype) 1770 { 1771 return -EOPNOTSUPP; 1772 } 1773 1774 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, 1775 u64 flags) 1776 { 1777 return -EOPNOTSUPP; 1778 } 1779 #endif /* CONFIG_BPF_STREAM_PARSER */ 1780 1781 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) 1782 void bpf_sk_reuseport_detach(struct sock *sk); 1783 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key, 1784 void *value); 1785 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key, 1786 void *value, u64 map_flags); 1787 #else 1788 static inline void bpf_sk_reuseport_detach(struct sock *sk) 1789 { 1790 } 1791 1792 #ifdef CONFIG_BPF_SYSCALL 1793 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, 1794 void *key, void *value) 1795 { 1796 return -EOPNOTSUPP; 1797 } 1798 1799 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, 1800 void *key, void *value, 1801 u64 map_flags) 1802 { 1803 return -EOPNOTSUPP; 1804 } 1805 #endif /* CONFIG_BPF_SYSCALL */ 1806 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */ 1807 1808 /* verifier prototypes for helper functions called from eBPF programs */ 1809 extern const struct bpf_func_proto bpf_map_lookup_elem_proto; 1810 extern const struct bpf_func_proto bpf_map_update_elem_proto; 1811 extern const struct bpf_func_proto bpf_map_delete_elem_proto; 1812 extern const struct bpf_func_proto bpf_map_push_elem_proto; 1813 extern const struct bpf_func_proto bpf_map_pop_elem_proto; 1814 extern const struct bpf_func_proto bpf_map_peek_elem_proto; 1815 1816 extern const struct bpf_func_proto bpf_get_prandom_u32_proto; 1817 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto; 1818 extern const struct bpf_func_proto bpf_get_numa_node_id_proto; 1819 extern const struct bpf_func_proto bpf_tail_call_proto; 1820 extern const struct bpf_func_proto bpf_ktime_get_ns_proto; 1821 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto; 1822 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto; 1823 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto; 1824 extern const struct bpf_func_proto bpf_get_current_comm_proto; 1825 extern const struct bpf_func_proto bpf_get_stackid_proto; 1826 extern const struct bpf_func_proto bpf_get_stack_proto; 1827 extern const struct bpf_func_proto bpf_get_task_stack_proto; 1828 extern const struct bpf_func_proto bpf_get_stackid_proto_pe; 1829 extern const struct bpf_func_proto bpf_get_stack_proto_pe; 1830 extern const struct bpf_func_proto bpf_sock_map_update_proto; 1831 extern const struct bpf_func_proto bpf_sock_hash_update_proto; 1832 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto; 1833 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto; 1834 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto; 1835 extern const struct bpf_func_proto bpf_msg_redirect_map_proto; 1836 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto; 1837 extern const struct bpf_func_proto bpf_sk_redirect_map_proto; 1838 extern const struct bpf_func_proto bpf_spin_lock_proto; 1839 extern const struct bpf_func_proto bpf_spin_unlock_proto; 1840 extern const struct bpf_func_proto bpf_get_local_storage_proto; 1841 extern const struct bpf_func_proto bpf_strtol_proto; 1842 extern const struct bpf_func_proto bpf_strtoul_proto; 1843 extern const struct bpf_func_proto bpf_tcp_sock_proto; 1844 extern const struct bpf_func_proto bpf_jiffies64_proto; 1845 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto; 1846 extern const struct bpf_func_proto bpf_event_output_data_proto; 1847 extern const struct bpf_func_proto bpf_ringbuf_output_proto; 1848 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto; 1849 extern const struct bpf_func_proto bpf_ringbuf_submit_proto; 1850 extern const struct bpf_func_proto bpf_ringbuf_discard_proto; 1851 extern const struct bpf_func_proto bpf_ringbuf_query_proto; 1852 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto; 1853 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto; 1854 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto; 1855 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto; 1856 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto; 1857 extern const struct bpf_func_proto bpf_copy_from_user_proto; 1858 extern const struct bpf_func_proto bpf_snprintf_btf_proto; 1859 extern const struct bpf_func_proto bpf_per_cpu_ptr_proto; 1860 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto; 1861 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto; 1862 extern const struct bpf_func_proto bpf_sock_from_file_proto; 1863 1864 const struct bpf_func_proto *bpf_tracing_func_proto( 1865 enum bpf_func_id func_id, const struct bpf_prog *prog); 1866 1867 const struct bpf_func_proto *tracing_prog_func_proto( 1868 enum bpf_func_id func_id, const struct bpf_prog *prog); 1869 1870 /* Shared helpers among cBPF and eBPF. */ 1871 void bpf_user_rnd_init_once(void); 1872 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 1873 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 1874 1875 #if defined(CONFIG_NET) 1876 bool bpf_sock_common_is_valid_access(int off, int size, 1877 enum bpf_access_type type, 1878 struct bpf_insn_access_aux *info); 1879 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type, 1880 struct bpf_insn_access_aux *info); 1881 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 1882 const struct bpf_insn *si, 1883 struct bpf_insn *insn_buf, 1884 struct bpf_prog *prog, 1885 u32 *target_size); 1886 #else 1887 static inline bool bpf_sock_common_is_valid_access(int off, int size, 1888 enum bpf_access_type type, 1889 struct bpf_insn_access_aux *info) 1890 { 1891 return false; 1892 } 1893 static inline bool bpf_sock_is_valid_access(int off, int size, 1894 enum bpf_access_type type, 1895 struct bpf_insn_access_aux *info) 1896 { 1897 return false; 1898 } 1899 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 1900 const struct bpf_insn *si, 1901 struct bpf_insn *insn_buf, 1902 struct bpf_prog *prog, 1903 u32 *target_size) 1904 { 1905 return 0; 1906 } 1907 #endif 1908 1909 #ifdef CONFIG_INET 1910 struct sk_reuseport_kern { 1911 struct sk_buff *skb; 1912 struct sock *sk; 1913 struct sock *selected_sk; 1914 void *data_end; 1915 u32 hash; 1916 u32 reuseport_id; 1917 bool bind_inany; 1918 }; 1919 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 1920 struct bpf_insn_access_aux *info); 1921 1922 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, 1923 const struct bpf_insn *si, 1924 struct bpf_insn *insn_buf, 1925 struct bpf_prog *prog, 1926 u32 *target_size); 1927 1928 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 1929 struct bpf_insn_access_aux *info); 1930 1931 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, 1932 const struct bpf_insn *si, 1933 struct bpf_insn *insn_buf, 1934 struct bpf_prog *prog, 1935 u32 *target_size); 1936 #else 1937 static inline bool bpf_tcp_sock_is_valid_access(int off, int size, 1938 enum bpf_access_type type, 1939 struct bpf_insn_access_aux *info) 1940 { 1941 return false; 1942 } 1943 1944 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, 1945 const struct bpf_insn *si, 1946 struct bpf_insn *insn_buf, 1947 struct bpf_prog *prog, 1948 u32 *target_size) 1949 { 1950 return 0; 1951 } 1952 static inline bool bpf_xdp_sock_is_valid_access(int off, int size, 1953 enum bpf_access_type type, 1954 struct bpf_insn_access_aux *info) 1955 { 1956 return false; 1957 } 1958 1959 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, 1960 const struct bpf_insn *si, 1961 struct bpf_insn *insn_buf, 1962 struct bpf_prog *prog, 1963 u32 *target_size) 1964 { 1965 return 0; 1966 } 1967 #endif /* CONFIG_INET */ 1968 1969 enum bpf_text_poke_type { 1970 BPF_MOD_CALL, 1971 BPF_MOD_JUMP, 1972 }; 1973 1974 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t, 1975 void *addr1, void *addr2); 1976 1977 struct btf_id_set; 1978 bool btf_id_set_contains(const struct btf_id_set *set, u32 id); 1979 1980 #endif /* _LINUX_BPF_H */ 1981