1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
7 #include <uapi/linux/bpf.h>
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>
24 struct bpf_verifier_env;
25 struct bpf_verifier_log;
34 struct exception_table_entry;
35 struct seq_operations;
37 extern struct idr btf_idr;
38 extern spinlock_t btf_idr_lock;
40 /* map is generic key/value storage optionally accesible by eBPF programs */
42 /* funcs callable from userspace (via syscall) */
43 int (*map_alloc_check)(union bpf_attr *attr);
44 struct bpf_map *(*map_alloc)(union bpf_attr *attr);
45 void (*map_release)(struct bpf_map *map, struct file *map_file);
46 void (*map_free)(struct bpf_map *map);
47 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
48 void (*map_release_uref)(struct bpf_map *map);
49 void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
50 int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr,
51 union bpf_attr __user *uattr);
52 int (*map_lookup_and_delete_batch)(struct bpf_map *map,
53 const union bpf_attr *attr,
54 union bpf_attr __user *uattr);
55 int (*map_update_batch)(struct bpf_map *map, const union bpf_attr *attr,
56 union bpf_attr __user *uattr);
57 int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr,
58 union bpf_attr __user *uattr);
60 /* funcs callable from userspace and from eBPF programs */
61 void *(*map_lookup_elem)(struct bpf_map *map, void *key);
62 int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
63 int (*map_delete_elem)(struct bpf_map *map, void *key);
64 int (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
65 int (*map_pop_elem)(struct bpf_map *map, void *value);
66 int (*map_peek_elem)(struct bpf_map *map, void *value);
68 /* funcs called by prog_array and perf_event_array map */
69 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
71 void (*map_fd_put_ptr)(void *ptr);
72 u32 (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
73 u32 (*map_fd_sys_lookup_elem)(void *ptr);
74 void (*map_seq_show_elem)(struct bpf_map *map, void *key,
76 int (*map_check_btf)(const struct bpf_map *map,
77 const struct btf *btf,
78 const struct btf_type *key_type,
79 const struct btf_type *value_type);
81 /* Prog poke tracking helpers. */
82 int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux);
83 void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux);
84 void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old,
85 struct bpf_prog *new);
87 /* Direct value access helpers. */
88 int (*map_direct_value_addr)(const struct bpf_map *map,
90 int (*map_direct_value_meta)(const struct bpf_map *map,
92 int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma);
93 __poll_t (*map_poll)(struct bpf_map *map, struct file *filp,
94 struct poll_table_struct *pts);
96 /* BTF name and id of struct allocated by map_alloc */
97 const char * const map_btf_name;
101 struct bpf_map_memory {
103 struct user_struct *user;
107 /* The first two cachelines with read-mostly members of which some
108 * are also accessed in fast-path (e.g. ops, max_entries).
110 const struct bpf_map_ops *ops ____cacheline_aligned;
111 struct bpf_map *inner_map_meta;
112 #ifdef CONFIG_SECURITY
115 enum bpf_map_type map_type;
120 int spin_lock_off; /* >=0 valid offset, <0 error */
124 u32 btf_value_type_id;
126 struct bpf_map_memory memory;
127 char name[BPF_OBJ_NAME_LEN];
128 u32 btf_vmlinux_value_type_id;
130 bool frozen; /* write-once; write-protected by freeze_mutex */
133 /* The 3rd and 4th cacheline with misc members to avoid false sharing
134 * particularly with refcounting.
136 atomic64_t refcnt ____cacheline_aligned;
138 struct work_struct work;
139 struct mutex freeze_mutex;
140 u64 writecnt; /* writable mmap cnt; protected by freeze_mutex */
143 static inline bool map_value_has_spin_lock(const struct bpf_map *map)
145 return map->spin_lock_off >= 0;
148 static inline void check_and_init_map_lock(struct bpf_map *map, void *dst)
150 if (likely(!map_value_has_spin_lock(map)))
152 *(struct bpf_spin_lock *)(dst + map->spin_lock_off) =
153 (struct bpf_spin_lock){};
156 /* copy everything but bpf_spin_lock */
157 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
159 if (unlikely(map_value_has_spin_lock(map))) {
160 u32 off = map->spin_lock_off;
162 memcpy(dst, src, off);
163 memcpy(dst + off + sizeof(struct bpf_spin_lock),
164 src + off + sizeof(struct bpf_spin_lock),
165 map->value_size - off - sizeof(struct bpf_spin_lock));
167 memcpy(dst, src, map->value_size);
170 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
172 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
174 struct bpf_offload_dev;
175 struct bpf_offloaded_map;
177 struct bpf_map_dev_ops {
178 int (*map_get_next_key)(struct bpf_offloaded_map *map,
179 void *key, void *next_key);
180 int (*map_lookup_elem)(struct bpf_offloaded_map *map,
181 void *key, void *value);
182 int (*map_update_elem)(struct bpf_offloaded_map *map,
183 void *key, void *value, u64 flags);
184 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
187 struct bpf_offloaded_map {
189 struct net_device *netdev;
190 const struct bpf_map_dev_ops *dev_ops;
192 struct list_head offloads;
195 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
197 return container_of(map, struct bpf_offloaded_map, map);
200 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
202 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
205 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
207 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
208 map->ops->map_seq_show_elem;
211 int map_check_no_btf(const struct bpf_map *map,
212 const struct btf *btf,
213 const struct btf_type *key_type,
214 const struct btf_type *value_type);
216 extern const struct bpf_map_ops bpf_map_offload_ops;
218 /* function argument constraints */
220 ARG_DONTCARE = 0, /* unused argument in helper function */
222 /* the following constraints used to prototype
223 * bpf_map_lookup/update/delete_elem() functions
225 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
226 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
227 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
228 ARG_PTR_TO_UNINIT_MAP_VALUE, /* pointer to valid memory used to store a map value */
229 ARG_PTR_TO_MAP_VALUE_OR_NULL, /* pointer to stack used as map value or NULL */
231 /* the following constraints used to prototype bpf_memcmp() and other
232 * functions that access data on eBPF program stack
234 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
235 ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */
236 ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized,
237 * helper function must fill all bytes or clear
238 * them in error case.
241 ARG_CONST_SIZE, /* number of bytes accessed from memory */
242 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
244 ARG_PTR_TO_CTX, /* pointer to context */
245 ARG_PTR_TO_CTX_OR_NULL, /* pointer to context or NULL */
246 ARG_ANYTHING, /* any (initialized) argument is ok */
247 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */
248 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
249 ARG_PTR_TO_INT, /* pointer to int */
250 ARG_PTR_TO_LONG, /* pointer to long */
251 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */
252 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */
253 ARG_PTR_TO_ALLOC_MEM, /* pointer to dynamically allocated memory */
254 ARG_PTR_TO_ALLOC_MEM_OR_NULL, /* pointer to dynamically allocated memory or NULL */
255 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */
258 /* type of values returned from helper functions */
259 enum bpf_return_type {
260 RET_INTEGER, /* function returns integer */
261 RET_VOID, /* function doesn't return anything */
262 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */
263 RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */
264 RET_PTR_TO_SOCKET_OR_NULL, /* returns a pointer to a socket or NULL */
265 RET_PTR_TO_TCP_SOCK_OR_NULL, /* returns a pointer to a tcp_sock or NULL */
266 RET_PTR_TO_SOCK_COMMON_OR_NULL, /* returns a pointer to a sock_common or NULL */
267 RET_PTR_TO_ALLOC_MEM_OR_NULL, /* returns a pointer to dynamically allocated memory or NULL */
268 RET_PTR_TO_BTF_ID_OR_NULL, /* returns a pointer to a btf_id or NULL */
271 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
272 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
273 * instructions after verifying
275 struct bpf_func_proto {
276 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
279 enum bpf_return_type ret_type;
282 enum bpf_arg_type arg1_type;
283 enum bpf_arg_type arg2_type;
284 enum bpf_arg_type arg3_type;
285 enum bpf_arg_type arg4_type;
286 enum bpf_arg_type arg5_type;
288 enum bpf_arg_type arg_type[5];
290 int *btf_id; /* BTF ids of arguments */
291 bool (*check_btf_id)(u32 btf_id, u32 arg); /* if the argument btf_id is
292 * valid. Often used if more
293 * than one btf id is permitted
296 int *ret_btf_id; /* return value btf_id */
299 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
300 * the first argument to eBPF programs.
301 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
305 enum bpf_access_type {
310 /* types of values stored in eBPF registers */
311 /* Pointer types represent:
314 * pointer + (u16) var
315 * pointer + (u16) var + imm
316 * if (range > 0) then [ptr, ptr + range - off) is safe to access
317 * if (id > 0) means that some 'var' was added
318 * if (off > 0) means that 'imm' was added
321 NOT_INIT = 0, /* nothing was written into register */
322 SCALAR_VALUE, /* reg doesn't contain a valid pointer */
323 PTR_TO_CTX, /* reg points to bpf_context */
324 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
325 PTR_TO_MAP_VALUE, /* reg points to map element value */
326 PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */
327 PTR_TO_STACK, /* reg == frame_pointer + offset */
328 PTR_TO_PACKET_META, /* skb->data - meta_len */
329 PTR_TO_PACKET, /* reg points to skb->data */
330 PTR_TO_PACKET_END, /* skb->data + headlen */
331 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */
332 PTR_TO_SOCKET, /* reg points to struct bpf_sock */
333 PTR_TO_SOCKET_OR_NULL, /* reg points to struct bpf_sock or NULL */
334 PTR_TO_SOCK_COMMON, /* reg points to sock_common */
335 PTR_TO_SOCK_COMMON_OR_NULL, /* reg points to sock_common or NULL */
336 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */
337 PTR_TO_TCP_SOCK_OR_NULL, /* reg points to struct tcp_sock or NULL */
338 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */
339 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */
340 PTR_TO_BTF_ID, /* reg points to kernel struct */
341 PTR_TO_BTF_ID_OR_NULL, /* reg points to kernel struct or NULL */
342 PTR_TO_MEM, /* reg points to valid memory region */
343 PTR_TO_MEM_OR_NULL, /* reg points to valid memory region or NULL */
346 /* The information passed from prog-specific *_is_valid_access
347 * back to the verifier.
349 struct bpf_insn_access_aux {
350 enum bpf_reg_type reg_type;
355 struct bpf_verifier_log *log; /* for verbose logs */
359 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
361 aux->ctx_field_size = size;
364 struct bpf_prog_ops {
365 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
366 union bpf_attr __user *uattr);
369 struct bpf_verifier_ops {
370 /* return eBPF function prototype for verification */
371 const struct bpf_func_proto *
372 (*get_func_proto)(enum bpf_func_id func_id,
373 const struct bpf_prog *prog);
375 /* return true if 'size' wide access at offset 'off' within bpf_context
376 * with 'type' (read or write) is allowed
378 bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
379 const struct bpf_prog *prog,
380 struct bpf_insn_access_aux *info);
381 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
382 const struct bpf_prog *prog);
383 int (*gen_ld_abs)(const struct bpf_insn *orig,
384 struct bpf_insn *insn_buf);
385 u32 (*convert_ctx_access)(enum bpf_access_type type,
386 const struct bpf_insn *src,
387 struct bpf_insn *dst,
388 struct bpf_prog *prog, u32 *target_size);
389 int (*btf_struct_access)(struct bpf_verifier_log *log,
390 const struct btf_type *t, int off, int size,
391 enum bpf_access_type atype,
395 struct bpf_prog_offload_ops {
396 /* verifier basic callbacks */
397 int (*insn_hook)(struct bpf_verifier_env *env,
398 int insn_idx, int prev_insn_idx);
399 int (*finalize)(struct bpf_verifier_env *env);
400 /* verifier optimization callbacks (called after .finalize) */
401 int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
402 struct bpf_insn *insn);
403 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
404 /* program management callbacks */
405 int (*prepare)(struct bpf_prog *prog);
406 int (*translate)(struct bpf_prog *prog);
407 void (*destroy)(struct bpf_prog *prog);
410 struct bpf_prog_offload {
411 struct bpf_prog *prog;
412 struct net_device *netdev;
413 struct bpf_offload_dev *offdev;
415 struct list_head offloads;
422 enum bpf_cgroup_storage_type {
423 BPF_CGROUP_STORAGE_SHARED,
424 BPF_CGROUP_STORAGE_PERCPU,
425 __BPF_CGROUP_STORAGE_MAX
428 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
430 /* The longest tracepoint has 12 args.
431 * See include/trace/bpf_probe.h
433 #define MAX_BPF_FUNC_ARGS 12
435 struct bpf_prog_stats {
438 struct u64_stats_sync syncp;
439 } __aligned(2 * sizeof(u64));
441 struct btf_func_model {
444 u8 arg_size[MAX_BPF_FUNC_ARGS];
447 /* Restore arguments before returning from trampoline to let original function
448 * continue executing. This flag is used for fentry progs when there are no
451 #define BPF_TRAMP_F_RESTORE_REGS BIT(0)
452 /* Call original function after fentry progs, but before fexit progs.
453 * Makes sense for fentry/fexit, normal calls and indirect calls.
455 #define BPF_TRAMP_F_CALL_ORIG BIT(1)
456 /* Skip current frame and return to parent. Makes sense for fentry/fexit
457 * programs only. Should not be used with normal calls and indirect calls.
459 #define BPF_TRAMP_F_SKIP_FRAME BIT(2)
461 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
462 * bytes on x86. Pick a number to fit into BPF_IMAGE_SIZE / 2
464 #define BPF_MAX_TRAMP_PROGS 40
466 struct bpf_tramp_progs {
467 struct bpf_prog *progs[BPF_MAX_TRAMP_PROGS];
471 /* Different use cases for BPF trampoline:
472 * 1. replace nop at the function entry (kprobe equivalent)
473 * flags = BPF_TRAMP_F_RESTORE_REGS
474 * fentry = a set of programs to run before returning from trampoline
476 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
477 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
478 * orig_call = fentry_ip + MCOUNT_INSN_SIZE
479 * fentry = a set of program to run before calling original function
480 * fexit = a set of program to run after original function
482 * 3. replace direct call instruction anywhere in the function body
483 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
485 * fentry = a set of programs to run before returning from trampoline
486 * With flags = BPF_TRAMP_F_CALL_ORIG
487 * orig_call = original callback addr or direct function addr
488 * fentry = a set of program to run before calling original function
489 * fexit = a set of program to run after original function
491 int arch_prepare_bpf_trampoline(void *image, void *image_end,
492 const struct btf_func_model *m, u32 flags,
493 struct bpf_tramp_progs *tprogs,
495 /* these two functions are called from generated trampoline */
496 u64 notrace __bpf_prog_enter(void);
497 void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start);
502 char name[KSYM_NAME_LEN];
503 struct list_head lnode;
504 struct latch_tree_node tnode;
508 enum bpf_tramp_prog_type {
511 BPF_TRAMP_MODIFY_RETURN,
513 BPF_TRAMP_REPLACE, /* more than MAX */
516 struct bpf_trampoline {
517 /* hlist for trampoline_table */
518 struct hlist_node hlist;
519 /* serializes access to fields of this trampoline */
524 struct btf_func_model model;
528 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
529 * program by replacing one of its functions. func.addr is the address
530 * of the function it replaced.
532 struct bpf_prog *extension_prog;
533 /* list of BPF programs using this trampoline */
534 struct hlist_head progs_hlist[BPF_TRAMP_MAX];
535 /* Number of attached programs. A counter per kind. */
536 int progs_cnt[BPF_TRAMP_MAX];
537 /* Executable image of trampoline */
540 struct bpf_ksym ksym;
543 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
545 struct bpf_dispatcher_prog {
546 struct bpf_prog *prog;
550 struct bpf_dispatcher {
551 /* dispatcher mutex */
554 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
558 struct bpf_ksym ksym;
561 static __always_inline unsigned int bpf_dispatcher_nop_func(
563 const struct bpf_insn *insnsi,
564 unsigned int (*bpf_func)(const void *,
565 const struct bpf_insn *))
567 return bpf_func(ctx, insnsi);
569 #ifdef CONFIG_BPF_JIT
570 struct bpf_trampoline *bpf_trampoline_lookup(u64 key);
571 int bpf_trampoline_link_prog(struct bpf_prog *prog);
572 int bpf_trampoline_unlink_prog(struct bpf_prog *prog);
573 void bpf_trampoline_put(struct bpf_trampoline *tr);
574 #define BPF_DISPATCHER_INIT(_name) { \
575 .mutex = __MUTEX_INITIALIZER(_name.mutex), \
576 .func = &_name##_func, \
583 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
587 #define DEFINE_BPF_DISPATCHER(name) \
588 noinline unsigned int bpf_dispatcher_##name##_func( \
590 const struct bpf_insn *insnsi, \
591 unsigned int (*bpf_func)(const void *, \
592 const struct bpf_insn *)) \
594 return bpf_func(ctx, insnsi); \
596 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \
597 struct bpf_dispatcher bpf_dispatcher_##name = \
598 BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
599 #define DECLARE_BPF_DISPATCHER(name) \
600 unsigned int bpf_dispatcher_##name##_func( \
602 const struct bpf_insn *insnsi, \
603 unsigned int (*bpf_func)(const void *, \
604 const struct bpf_insn *)); \
605 extern struct bpf_dispatcher bpf_dispatcher_##name;
606 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
607 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
608 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
609 struct bpf_prog *to);
610 /* Called only from JIT-enabled code, so there's no need for stubs. */
611 void *bpf_jit_alloc_exec_page(void);
612 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym);
613 void bpf_image_ksym_del(struct bpf_ksym *ksym);
614 void bpf_ksym_add(struct bpf_ksym *ksym);
615 void bpf_ksym_del(struct bpf_ksym *ksym);
617 static inline struct bpf_trampoline *bpf_trampoline_lookup(u64 key)
621 static inline int bpf_trampoline_link_prog(struct bpf_prog *prog)
625 static inline int bpf_trampoline_unlink_prog(struct bpf_prog *prog)
629 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
630 #define DEFINE_BPF_DISPATCHER(name)
631 #define DECLARE_BPF_DISPATCHER(name)
632 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
633 #define BPF_DISPATCHER_PTR(name) NULL
634 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
635 struct bpf_prog *from,
636 struct bpf_prog *to) {}
637 static inline bool is_bpf_image_address(unsigned long address)
643 struct bpf_func_info_aux {
648 enum bpf_jit_poke_reason {
649 BPF_POKE_REASON_TAIL_CALL,
652 /* Descriptor of pokes pointing /into/ the JITed image. */
653 struct bpf_jit_poke_descriptor {
666 /* reg_type info for ctx arguments */
667 struct bpf_ctx_arg_aux {
669 enum bpf_reg_type reg_type;
672 struct bpf_prog_aux {
680 u32 func_cnt; /* used by non-func prog as the number of func progs */
681 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
682 u32 attach_btf_id; /* in-kernel BTF type id to attach to */
683 u32 ctx_arg_info_size;
684 const struct bpf_ctx_arg_aux *ctx_arg_info;
685 struct bpf_prog *linked_prog;
686 bool verifier_zext; /* Zero extensions has been inserted by verifier. */
687 bool offload_requested;
688 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
689 bool func_proto_unreliable;
690 enum bpf_tramp_prog_type trampoline_prog_type;
691 struct bpf_trampoline *trampoline;
692 struct hlist_node tramp_hlist;
693 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
694 const struct btf_type *attach_func_proto;
695 /* function name for valid attach_btf_id */
696 const char *attach_func_name;
697 struct bpf_prog **func;
698 void *jit_data; /* JIT specific data. arch dependent */
699 struct bpf_jit_poke_descriptor *poke_tab;
701 struct bpf_ksym ksym;
702 const struct bpf_prog_ops *ops;
703 struct bpf_map **used_maps;
704 struct bpf_prog *prog;
705 struct user_struct *user;
706 u64 load_time; /* ns since boottime */
707 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
708 char name[BPF_OBJ_NAME_LEN];
709 #ifdef CONFIG_SECURITY
712 struct bpf_prog_offload *offload;
714 struct bpf_func_info *func_info;
715 struct bpf_func_info_aux *func_info_aux;
716 /* bpf_line_info loaded from userspace. linfo->insn_off
717 * has the xlated insn offset.
718 * Both the main and sub prog share the same linfo.
719 * The subprog can access its first linfo by
720 * using the linfo_idx.
722 struct bpf_line_info *linfo;
723 /* jited_linfo is the jited addr of the linfo. It has a
724 * one to one mapping to linfo:
725 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
726 * Both the main and sub prog share the same jited_linfo.
727 * The subprog can access its first jited_linfo by
728 * using the linfo_idx.
733 /* subprog can use linfo_idx to access its first linfo and
735 * main prog always has linfo_idx == 0
739 struct exception_table_entry *extable;
740 struct bpf_prog_stats __percpu *stats;
742 struct work_struct work;
747 struct bpf_array_aux {
748 /* 'Ownership' of prog array is claimed by the first program that
749 * is going to use this map or by the first program which FD is
750 * stored in the map to make sure that all callers and callees have
751 * the same prog type and JITed flag.
753 enum bpf_prog_type type;
755 /* Programs with direct jumps into programs part of this array. */
756 struct list_head poke_progs;
758 struct mutex poke_mutex;
759 struct work_struct work;
762 struct bpf_struct_ops_value;
766 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
767 struct bpf_struct_ops {
768 const struct bpf_verifier_ops *verifier_ops;
769 int (*init)(struct btf *btf);
770 int (*check_member)(const struct btf_type *t,
771 const struct btf_member *member);
772 int (*init_member)(const struct btf_type *t,
773 const struct btf_member *member,
774 void *kdata, const void *udata);
775 int (*reg)(void *kdata);
776 void (*unreg)(void *kdata);
777 const struct btf_type *type;
778 const struct btf_type *value_type;
780 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
785 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
786 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
787 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id);
788 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log);
789 bool bpf_struct_ops_get(const void *kdata);
790 void bpf_struct_ops_put(const void *kdata);
791 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
793 static inline bool bpf_try_module_get(const void *data, struct module *owner)
795 if (owner == BPF_MODULE_OWNER)
796 return bpf_struct_ops_get(data);
798 return try_module_get(owner);
800 static inline void bpf_module_put(const void *data, struct module *owner)
802 if (owner == BPF_MODULE_OWNER)
803 bpf_struct_ops_put(data);
808 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
812 static inline void bpf_struct_ops_init(struct btf *btf,
813 struct bpf_verifier_log *log)
816 static inline bool bpf_try_module_get(const void *data, struct module *owner)
818 return try_module_get(owner);
820 static inline void bpf_module_put(const void *data, struct module *owner)
824 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
836 struct bpf_array_aux *aux;
838 char value[0] __aligned(8);
839 void *ptrs[0] __aligned(8);
840 void __percpu *pptrs[0] __aligned(8);
844 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
845 #define MAX_TAIL_CALL_CNT 32
847 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
848 BPF_F_RDONLY_PROG | \
852 #define BPF_MAP_CAN_READ BIT(0)
853 #define BPF_MAP_CAN_WRITE BIT(1)
855 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
857 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
859 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
862 if (access_flags & BPF_F_RDONLY_PROG)
863 return BPF_MAP_CAN_READ;
864 else if (access_flags & BPF_F_WRONLY_PROG)
865 return BPF_MAP_CAN_WRITE;
867 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
870 static inline bool bpf_map_flags_access_ok(u32 access_flags)
872 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
873 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
876 struct bpf_event_entry {
877 struct perf_event *event;
878 struct file *perf_file;
879 struct file *map_file;
883 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);
884 int bpf_prog_calc_tag(struct bpf_prog *fp);
885 const char *kernel_type_name(u32 btf_type_id);
887 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
889 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
890 unsigned long off, unsigned long len);
891 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
892 const struct bpf_insn *src,
893 struct bpf_insn *dst,
894 struct bpf_prog *prog,
897 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
898 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
900 /* an array of programs to be executed under rcu_lock.
903 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN);
905 * the structure returned by bpf_prog_array_alloc() should be populated
906 * with program pointers and the last pointer must be NULL.
907 * The user has to keep refcnt on the program and make sure the program
908 * is removed from the array before bpf_prog_put().
909 * The 'struct bpf_prog_array *' should only be replaced with xchg()
910 * since other cpus are walking the array of pointers in parallel.
912 struct bpf_prog_array_item {
913 struct bpf_prog *prog;
914 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
917 struct bpf_prog_array {
919 struct bpf_prog_array_item items[];
922 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
923 void bpf_prog_array_free(struct bpf_prog_array *progs);
924 int bpf_prog_array_length(struct bpf_prog_array *progs);
925 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
926 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
927 __u32 __user *prog_ids, u32 cnt);
929 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
930 struct bpf_prog *old_prog);
931 int bpf_prog_array_copy_info(struct bpf_prog_array *array,
932 u32 *prog_ids, u32 request_cnt,
934 int bpf_prog_array_copy(struct bpf_prog_array *old_array,
935 struct bpf_prog *exclude_prog,
936 struct bpf_prog *include_prog,
937 struct bpf_prog_array **new_array);
939 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null) \
941 struct bpf_prog_array_item *_item; \
942 struct bpf_prog *_prog; \
943 struct bpf_prog_array *_array; \
947 _array = rcu_dereference(array); \
948 if (unlikely(check_non_null && !_array))\
950 _item = &_array->items[0]; \
951 while ((_prog = READ_ONCE(_item->prog))) { \
952 bpf_cgroup_storage_set(_item->cgroup_storage); \
953 _ret &= func(_prog, ctx); \
962 /* To be used by __cgroup_bpf_run_filter_skb for EGRESS BPF progs
963 * so BPF programs can request cwr for TCP packets.
965 * Current cgroup skb programs can only return 0 or 1 (0 to drop the
966 * packet. This macro changes the behavior so the low order bit
967 * indicates whether the packet should be dropped (0) or not (1)
968 * and the next bit is a congestion notification bit. This could be
969 * used by TCP to call tcp_enter_cwr()
971 * Hence, new allowed return values of CGROUP EGRESS BPF programs are:
974 * 2: drop packet and cn
975 * 3: keep packet and cn
977 * This macro then converts it to one of the NET_XMIT or an error
978 * code that is then interpreted as drop packet (and no cn):
979 * 0: NET_XMIT_SUCCESS skb should be transmitted
980 * 1: NET_XMIT_DROP skb should be dropped and cn
981 * 2: NET_XMIT_CN skb should be transmitted and cn
982 * 3: -EPERM skb should be dropped
984 #define BPF_PROG_CGROUP_INET_EGRESS_RUN_ARRAY(array, ctx, func) \
986 struct bpf_prog_array_item *_item; \
987 struct bpf_prog *_prog; \
988 struct bpf_prog_array *_array; \
994 _array = rcu_dereference(array); \
995 _item = &_array->items[0]; \
996 while ((_prog = READ_ONCE(_item->prog))) { \
997 bpf_cgroup_storage_set(_item->cgroup_storage); \
998 ret = func(_prog, ctx); \
1003 rcu_read_unlock(); \
1006 _ret = (_cn ? NET_XMIT_CN : NET_XMIT_SUCCESS); \
1008 _ret = (_cn ? NET_XMIT_DROP : -EPERM); \
1012 #define BPF_PROG_RUN_ARRAY(array, ctx, func) \
1013 __BPF_PROG_RUN_ARRAY(array, ctx, func, false)
1015 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \
1016 __BPF_PROG_RUN_ARRAY(array, ctx, func, true)
1018 #ifdef CONFIG_BPF_SYSCALL
1019 DECLARE_PER_CPU(int, bpf_prog_active);
1020 extern struct mutex bpf_stats_enabled_mutex;
1023 * Block execution of BPF programs attached to instrumentation (perf,
1024 * kprobes, tracepoints) to prevent deadlocks on map operations as any of
1025 * these events can happen inside a region which holds a map bucket lock
1026 * and can deadlock on it.
1028 * Use the preemption safe inc/dec variants on RT because migrate disable
1029 * is preemptible on RT and preemption in the middle of the RMW operation
1030 * might lead to inconsistent state. Use the raw variants for non RT
1031 * kernels as migrate_disable() maps to preempt_disable() so the slightly
1032 * more expensive save operation can be avoided.
1034 static inline void bpf_disable_instrumentation(void)
1037 if (IS_ENABLED(CONFIG_PREEMPT_RT))
1038 this_cpu_inc(bpf_prog_active);
1040 __this_cpu_inc(bpf_prog_active);
1043 static inline void bpf_enable_instrumentation(void)
1045 if (IS_ENABLED(CONFIG_PREEMPT_RT))
1046 this_cpu_dec(bpf_prog_active);
1048 __this_cpu_dec(bpf_prog_active);
1052 extern const struct file_operations bpf_map_fops;
1053 extern const struct file_operations bpf_prog_fops;
1054 extern const struct file_operations bpf_iter_fops;
1056 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
1057 extern const struct bpf_prog_ops _name ## _prog_ops; \
1058 extern const struct bpf_verifier_ops _name ## _verifier_ops;
1059 #define BPF_MAP_TYPE(_id, _ops) \
1060 extern const struct bpf_map_ops _ops;
1061 #define BPF_LINK_TYPE(_id, _name)
1062 #include <linux/bpf_types.h>
1063 #undef BPF_PROG_TYPE
1065 #undef BPF_LINK_TYPE
1067 extern const struct bpf_prog_ops bpf_offload_prog_ops;
1068 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
1069 extern const struct bpf_verifier_ops xdp_analyzer_ops;
1071 struct bpf_prog *bpf_prog_get(u32 ufd);
1072 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
1074 void bpf_prog_add(struct bpf_prog *prog, int i);
1075 void bpf_prog_sub(struct bpf_prog *prog, int i);
1076 void bpf_prog_inc(struct bpf_prog *prog);
1077 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
1078 void bpf_prog_put(struct bpf_prog *prog);
1079 int __bpf_prog_charge(struct user_struct *user, u32 pages);
1080 void __bpf_prog_uncharge(struct user_struct *user, u32 pages);
1081 void __bpf_free_used_maps(struct bpf_prog_aux *aux,
1082 struct bpf_map **used_maps, u32 len);
1084 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock);
1085 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);
1087 struct bpf_map *bpf_map_get(u32 ufd);
1088 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
1089 struct bpf_map *__bpf_map_get(struct fd f);
1090 void bpf_map_inc(struct bpf_map *map);
1091 void bpf_map_inc_with_uref(struct bpf_map *map);
1092 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
1093 void bpf_map_put_with_uref(struct bpf_map *map);
1094 void bpf_map_put(struct bpf_map *map);
1095 int bpf_map_charge_memlock(struct bpf_map *map, u32 pages);
1096 void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages);
1097 int bpf_map_charge_init(struct bpf_map_memory *mem, u64 size);
1098 void bpf_map_charge_finish(struct bpf_map_memory *mem);
1099 void bpf_map_charge_move(struct bpf_map_memory *dst,
1100 struct bpf_map_memory *src);
1101 void *bpf_map_area_alloc(u64 size, int numa_node);
1102 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
1103 void bpf_map_area_free(void *base);
1104 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
1105 int generic_map_lookup_batch(struct bpf_map *map,
1106 const union bpf_attr *attr,
1107 union bpf_attr __user *uattr);
1108 int generic_map_update_batch(struct bpf_map *map,
1109 const union bpf_attr *attr,
1110 union bpf_attr __user *uattr);
1111 int generic_map_delete_batch(struct bpf_map *map,
1112 const union bpf_attr *attr,
1113 union bpf_attr __user *uattr);
1114 struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
1116 extern int sysctl_unprivileged_bpf_disabled;
1118 static inline bool bpf_allow_ptr_leaks(void)
1120 return perfmon_capable();
1123 static inline bool bpf_allow_ptr_to_map_access(void)
1125 return perfmon_capable();
1128 static inline bool bpf_bypass_spec_v1(void)
1130 return perfmon_capable();
1133 static inline bool bpf_bypass_spec_v4(void)
1135 return perfmon_capable();
1138 int bpf_map_new_fd(struct bpf_map *map, int flags);
1139 int bpf_prog_new_fd(struct bpf_prog *prog);
1144 enum bpf_link_type type;
1145 const struct bpf_link_ops *ops;
1146 struct bpf_prog *prog;
1147 struct work_struct work;
1150 struct bpf_link_primer {
1151 struct bpf_link *link;
1157 struct bpf_link_ops {
1158 void (*release)(struct bpf_link *link);
1159 void (*dealloc)(struct bpf_link *link);
1160 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
1161 struct bpf_prog *old_prog);
1162 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
1163 int (*fill_link_info)(const struct bpf_link *link,
1164 struct bpf_link_info *info);
1167 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
1168 const struct bpf_link_ops *ops, struct bpf_prog *prog);
1169 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
1170 int bpf_link_settle(struct bpf_link_primer *primer);
1171 void bpf_link_cleanup(struct bpf_link_primer *primer);
1172 void bpf_link_inc(struct bpf_link *link);
1173 void bpf_link_put(struct bpf_link *link);
1174 int bpf_link_new_fd(struct bpf_link *link);
1175 struct file *bpf_link_new_file(struct bpf_link *link, int *reserved_fd);
1176 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
1178 int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
1179 int bpf_obj_get_user(const char __user *pathname, int flags);
1181 #define BPF_ITER_FUNC_PREFIX "bpf_iter_"
1182 #define DEFINE_BPF_ITER_FUNC(target, args...) \
1183 extern int bpf_iter_ ## target(args); \
1184 int __init bpf_iter_ ## target(args) { return 0; }
1186 typedef int (*bpf_iter_init_seq_priv_t)(void *private_data);
1187 typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);
1189 #define BPF_ITER_CTX_ARG_MAX 2
1190 struct bpf_iter_reg {
1192 const struct seq_operations *seq_ops;
1193 bpf_iter_init_seq_priv_t init_seq_private;
1194 bpf_iter_fini_seq_priv_t fini_seq_private;
1196 u32 ctx_arg_info_size;
1197 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
1200 struct bpf_iter_meta {
1201 __bpf_md_ptr(struct seq_file *, seq);
1206 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
1207 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
1208 bool bpf_iter_prog_supported(struct bpf_prog *prog);
1209 int bpf_iter_link_attach(const union bpf_attr *attr, struct bpf_prog *prog);
1210 int bpf_iter_new_fd(struct bpf_link *link);
1211 bool bpf_link_is_iter(struct bpf_link *link);
1212 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
1213 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
1215 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
1216 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
1217 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
1219 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
1222 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
1224 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
1225 void *key, void *value, u64 map_flags);
1226 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1227 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
1228 void *key, void *value, u64 map_flags);
1229 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1231 int bpf_get_file_flag(int flags);
1232 int bpf_check_uarg_tail_zero(void __user *uaddr, size_t expected_size,
1233 size_t actual_size);
1235 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
1236 * forced to use 'long' read/writes to try to atomically copy long counters.
1237 * Best-effort only. No barriers here, since it _will_ race with concurrent
1238 * updates from BPF programs. Called from bpf syscall and mostly used with
1239 * size 8 or 16 bytes, so ask compiler to inline it.
1241 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
1243 const long *lsrc = src;
1246 size /= sizeof(long);
1251 /* verify correctness of eBPF program */
1252 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr,
1253 union bpf_attr __user *uattr);
1254 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
1260 struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key);
1261 struct bpf_dtab_netdev *__dev_map_hash_lookup_elem(struct bpf_map *map, u32 key);
1262 void __dev_flush(void);
1263 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
1264 struct net_device *dev_rx);
1265 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
1266 struct net_device *dev_rx);
1267 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
1268 struct bpf_prog *xdp_prog);
1269 bool dev_map_can_have_prog(struct bpf_map *map);
1271 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key);
1272 void __cpu_map_flush(void);
1273 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,
1274 struct net_device *dev_rx);
1276 /* Return map's numa specified by userspace */
1277 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
1279 return (attr->map_flags & BPF_F_NUMA_NODE) ?
1280 attr->numa_node : NUMA_NO_NODE;
1283 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
1284 int array_map_alloc_check(union bpf_attr *attr);
1286 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
1287 union bpf_attr __user *uattr);
1288 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
1289 union bpf_attr __user *uattr);
1290 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1291 const union bpf_attr *kattr,
1292 union bpf_attr __user *uattr);
1293 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1294 const union bpf_attr *kattr,
1295 union bpf_attr __user *uattr);
1296 bool btf_ctx_access(int off, int size, enum bpf_access_type type,
1297 const struct bpf_prog *prog,
1298 struct bpf_insn_access_aux *info);
1299 int btf_struct_access(struct bpf_verifier_log *log,
1300 const struct btf_type *t, int off, int size,
1301 enum bpf_access_type atype,
1303 int btf_resolve_helper_id(struct bpf_verifier_log *log,
1304 const struct bpf_func_proto *fn, int);
1306 int btf_distill_func_proto(struct bpf_verifier_log *log,
1308 const struct btf_type *func_proto,
1309 const char *func_name,
1310 struct btf_func_model *m);
1312 struct bpf_reg_state;
1313 int btf_check_func_arg_match(struct bpf_verifier_env *env, int subprog,
1314 struct bpf_reg_state *regs);
1315 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
1316 struct bpf_reg_state *reg);
1317 int btf_check_type_match(struct bpf_verifier_env *env, struct bpf_prog *prog,
1318 struct btf *btf, const struct btf_type *t);
1320 struct bpf_prog *bpf_prog_by_id(u32 id);
1322 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id);
1323 #else /* !CONFIG_BPF_SYSCALL */
1324 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
1326 return ERR_PTR(-EOPNOTSUPP);
1329 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
1330 enum bpf_prog_type type,
1333 return ERR_PTR(-EOPNOTSUPP);
1336 static inline void bpf_prog_add(struct bpf_prog *prog, int i)
1340 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
1344 static inline void bpf_prog_put(struct bpf_prog *prog)
1348 static inline void bpf_prog_inc(struct bpf_prog *prog)
1352 static inline struct bpf_prog *__must_check
1353 bpf_prog_inc_not_zero(struct bpf_prog *prog)
1355 return ERR_PTR(-EOPNOTSUPP);
1358 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages)
1363 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
1367 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
1372 static inline struct net_device *__dev_map_lookup_elem(struct bpf_map *map,
1378 static inline struct net_device *__dev_map_hash_lookup_elem(struct bpf_map *map,
1383 static inline bool dev_map_can_have_prog(struct bpf_map *map)
1388 static inline void __dev_flush(void)
1393 struct bpf_dtab_netdev;
1396 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
1397 struct net_device *dev_rx)
1403 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
1404 struct net_device *dev_rx)
1411 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
1412 struct sk_buff *skb,
1413 struct bpf_prog *xdp_prog)
1419 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key)
1424 static inline void __cpu_map_flush(void)
1428 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
1429 struct xdp_buff *xdp,
1430 struct net_device *dev_rx)
1435 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
1436 enum bpf_prog_type type)
1438 return ERR_PTR(-EOPNOTSUPP);
1441 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
1442 const union bpf_attr *kattr,
1443 union bpf_attr __user *uattr)
1448 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
1449 const union bpf_attr *kattr,
1450 union bpf_attr __user *uattr)
1455 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1456 const union bpf_attr *kattr,
1457 union bpf_attr __user *uattr)
1462 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1463 const union bpf_attr *kattr,
1464 union bpf_attr __user *uattr)
1469 static inline void bpf_map_put(struct bpf_map *map)
1473 static inline struct bpf_prog *bpf_prog_by_id(u32 id)
1475 return ERR_PTR(-ENOTSUPP);
1478 static inline const struct bpf_func_proto *
1479 bpf_base_func_proto(enum bpf_func_id func_id)
1483 #endif /* CONFIG_BPF_SYSCALL */
1485 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
1486 enum bpf_prog_type type)
1488 return bpf_prog_get_type_dev(ufd, type, false);
1491 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
1493 int bpf_prog_offload_compile(struct bpf_prog *prog);
1494 void bpf_prog_offload_destroy(struct bpf_prog *prog);
1495 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
1496 struct bpf_prog *prog);
1498 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
1500 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
1501 int bpf_map_offload_update_elem(struct bpf_map *map,
1502 void *key, void *value, u64 flags);
1503 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
1504 int bpf_map_offload_get_next_key(struct bpf_map *map,
1505 void *key, void *next_key);
1507 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
1509 struct bpf_offload_dev *
1510 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
1511 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
1512 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
1513 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
1514 struct net_device *netdev);
1515 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
1516 struct net_device *netdev);
1517 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
1519 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
1520 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
1522 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
1524 return aux->offload_requested;
1527 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
1529 return unlikely(map->ops == &bpf_map_offload_ops);
1532 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
1533 void bpf_map_offload_map_free(struct bpf_map *map);
1534 void init_btf_sock_ids(struct btf *btf);
1536 static inline int bpf_prog_offload_init(struct bpf_prog *prog,
1537 union bpf_attr *attr)
1542 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
1547 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
1552 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
1554 return ERR_PTR(-EOPNOTSUPP);
1557 static inline void bpf_map_offload_map_free(struct bpf_map *map)
1560 static inline void init_btf_sock_ids(struct btf *btf)
1563 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
1565 #if defined(CONFIG_BPF_STREAM_PARSER)
1566 int sock_map_prog_update(struct bpf_map *map, struct bpf_prog *prog, u32 which);
1567 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
1568 void sock_map_unhash(struct sock *sk);
1569 void sock_map_close(struct sock *sk, long timeout);
1571 static inline int sock_map_prog_update(struct bpf_map *map,
1572 struct bpf_prog *prog, u32 which)
1577 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
1578 struct bpf_prog *prog)
1582 #endif /* CONFIG_BPF_STREAM_PARSER */
1584 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
1585 void bpf_sk_reuseport_detach(struct sock *sk);
1586 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
1588 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
1589 void *value, u64 map_flags);
1591 static inline void bpf_sk_reuseport_detach(struct sock *sk)
1595 #ifdef CONFIG_BPF_SYSCALL
1596 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
1597 void *key, void *value)
1602 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
1603 void *key, void *value,
1608 #endif /* CONFIG_BPF_SYSCALL */
1609 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
1611 /* verifier prototypes for helper functions called from eBPF programs */
1612 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
1613 extern const struct bpf_func_proto bpf_map_update_elem_proto;
1614 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
1615 extern const struct bpf_func_proto bpf_map_push_elem_proto;
1616 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
1617 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
1619 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
1620 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
1621 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
1622 extern const struct bpf_func_proto bpf_tail_call_proto;
1623 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
1624 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
1625 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
1626 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
1627 extern const struct bpf_func_proto bpf_get_current_comm_proto;
1628 extern const struct bpf_func_proto bpf_get_stackid_proto;
1629 extern const struct bpf_func_proto bpf_get_stack_proto;
1630 extern const struct bpf_func_proto bpf_get_task_stack_proto;
1631 extern const struct bpf_func_proto bpf_sock_map_update_proto;
1632 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
1633 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
1634 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
1635 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
1636 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
1637 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
1638 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
1639 extern const struct bpf_func_proto bpf_spin_lock_proto;
1640 extern const struct bpf_func_proto bpf_spin_unlock_proto;
1641 extern const struct bpf_func_proto bpf_get_local_storage_proto;
1642 extern const struct bpf_func_proto bpf_strtol_proto;
1643 extern const struct bpf_func_proto bpf_strtoul_proto;
1644 extern const struct bpf_func_proto bpf_tcp_sock_proto;
1645 extern const struct bpf_func_proto bpf_jiffies64_proto;
1646 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
1647 extern const struct bpf_func_proto bpf_event_output_data_proto;
1648 extern const struct bpf_func_proto bpf_ringbuf_output_proto;
1649 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
1650 extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
1651 extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
1652 extern const struct bpf_func_proto bpf_ringbuf_query_proto;
1653 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
1654 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
1655 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
1656 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
1657 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
1659 const struct bpf_func_proto *bpf_tracing_func_proto(
1660 enum bpf_func_id func_id, const struct bpf_prog *prog);
1662 const struct bpf_func_proto *tracing_prog_func_proto(
1663 enum bpf_func_id func_id, const struct bpf_prog *prog);
1665 /* Shared helpers among cBPF and eBPF. */
1666 void bpf_user_rnd_init_once(void);
1667 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
1668 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
1670 #if defined(CONFIG_NET)
1671 bool bpf_sock_common_is_valid_access(int off, int size,
1672 enum bpf_access_type type,
1673 struct bpf_insn_access_aux *info);
1674 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
1675 struct bpf_insn_access_aux *info);
1676 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
1677 const struct bpf_insn *si,
1678 struct bpf_insn *insn_buf,
1679 struct bpf_prog *prog,
1682 static inline bool bpf_sock_common_is_valid_access(int off, int size,
1683 enum bpf_access_type type,
1684 struct bpf_insn_access_aux *info)
1688 static inline bool bpf_sock_is_valid_access(int off, int size,
1689 enum bpf_access_type type,
1690 struct bpf_insn_access_aux *info)
1694 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
1695 const struct bpf_insn *si,
1696 struct bpf_insn *insn_buf,
1697 struct bpf_prog *prog,
1705 struct sk_reuseport_kern {
1706 struct sk_buff *skb;
1708 struct sock *selected_sk;
1714 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
1715 struct bpf_insn_access_aux *info);
1717 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
1718 const struct bpf_insn *si,
1719 struct bpf_insn *insn_buf,
1720 struct bpf_prog *prog,
1723 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
1724 struct bpf_insn_access_aux *info);
1726 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
1727 const struct bpf_insn *si,
1728 struct bpf_insn *insn_buf,
1729 struct bpf_prog *prog,
1732 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
1733 enum bpf_access_type type,
1734 struct bpf_insn_access_aux *info)
1739 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
1740 const struct bpf_insn *si,
1741 struct bpf_insn *insn_buf,
1742 struct bpf_prog *prog,
1747 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
1748 enum bpf_access_type type,
1749 struct bpf_insn_access_aux *info)
1754 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
1755 const struct bpf_insn *si,
1756 struct bpf_insn *insn_buf,
1757 struct bpf_prog *prog,
1762 #endif /* CONFIG_INET */
1764 enum bpf_text_poke_type {
1769 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
1770 void *addr1, void *addr2);
1772 #endif /* _LINUX_BPF_H */