[deliverable/linux.git] / include / linux / bpf.h

/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 */
#ifndef _LINUX_BPF_H
#define _LINUX_BPF_H 1

#include <uapi/linux/bpf.h>
#include <linux/workqueue.h>
#include <linux/file.h>
#include <linux/percpu.h>
#include <linux/err.h>

struct perf_event;
struct bpf_map;

/* map is generic key/value storage optionally accesible by eBPF programs */
struct bpf_map_ops {
	/* funcs callable from userspace (via syscall) */
	struct bpf_map *(*map_alloc)(union bpf_attr *attr);
	void (*map_release)(struct bpf_map *map, struct file *map_file);
	void (*map_free)(struct bpf_map *map);
	int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);

	/* funcs callable from userspace and from eBPF programs */
	void *(*map_lookup_elem)(struct bpf_map *map, void *key);
	int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
	int (*map_delete_elem)(struct bpf_map *map, void *key);

	/* funcs called by prog_array and perf_event_array map */
	void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
				int fd);
	void (*map_fd_put_ptr)(void *ptr);
};

struct bpf_map {
	atomic_t refcnt;
	enum bpf_map_type map_type;
	u32 key_size;
	u32 value_size;
	u32 max_entries;
	u32 map_flags;
	u32 pages;
	struct user_struct *user;
	const struct bpf_map_ops *ops;
	struct work_struct work;
	atomic_t usercnt;
};

struct bpf_map_type_list {
	struct list_head list_node;
	const struct bpf_map_ops *ops;
	enum bpf_map_type type;
};

/* function argument constraints */
enum bpf_arg_type {
	ARG_DONTCARE = 0,	/* unused argument in helper function */

	/* the following constraints used to prototype
	 * bpf_map_lookup/update/delete_elem() functions
	 */
	ARG_CONST_MAP_PTR,	/* const argument used as pointer to bpf_map */
	ARG_PTR_TO_MAP_KEY,	/* pointer to stack used as map key */
	ARG_PTR_TO_MAP_VALUE,	/* pointer to stack used as map value */

	/* the following constraints used to prototype bpf_memcmp() and other
	 * functions that access data on eBPF program stack
	 */
	ARG_PTR_TO_STACK,	/* any pointer to eBPF program stack */
	ARG_PTR_TO_RAW_STACK,	/* any pointer to eBPF program stack, area does not
				 * need to be initialized, helper function must fill
				 * all bytes or clear them in error case.
				 */

	ARG_CONST_STACK_SIZE,	/* number of bytes accessed from stack */
	ARG_CONST_STACK_SIZE_OR_ZERO, /* number of bytes accessed from stack or 0 */

	ARG_PTR_TO_CTX,		/* pointer to context */
	ARG_ANYTHING,		/* any (initialized) argument is ok */
};

/* type of values returned from helper functions */
enum bpf_return_type {
	RET_INTEGER,			/* function returns integer */
	RET_VOID,			/* function doesn't return anything */
	RET_PTR_TO_MAP_VALUE_OR_NULL,	/* returns a pointer to map elem value or NULL */
};

/* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
 * instructions after verifying
 */
struct bpf_func_proto {
	u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
	bool gpl_only;
	enum bpf_return_type ret_type;
	enum bpf_arg_type arg1_type;
	enum bpf_arg_type arg2_type;
	enum bpf_arg_type arg3_type;
	enum bpf_arg_type arg4_type;
	enum bpf_arg_type arg5_type;
};

/* bpf_context is intentionally undefined structure. Pointer to bpf_context is
 * the first argument to eBPF programs.
 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
 */
struct bpf_context;

enum bpf_access_type {
	BPF_READ = 1,
	BPF_WRITE = 2
};

/* types of values stored in eBPF registers */
enum bpf_reg_type {
	NOT_INIT = 0,		 /* nothing was written into register */
	UNKNOWN_VALUE,		 /* reg doesn't contain a valid pointer */
	PTR_TO_CTX,		 /* reg points to bpf_context */
	CONST_PTR_TO_MAP,	 /* reg points to struct bpf_map */
	PTR_TO_MAP_VALUE,	 /* reg points to map element value */
	PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */
	FRAME_PTR,		 /* reg == frame_pointer */
	PTR_TO_STACK,		 /* reg == frame_pointer + imm */
	CONST_IMM,		 /* constant integer value */

	/* PTR_TO_PACKET represents:
	 * skb->data
	 * skb->data + imm
	 * skb->data + (u16) var
	 * skb->data + (u16) var + imm
	 * if (range > 0) then [ptr, ptr + range - off) is safe to access
	 * if (id > 0) means that some 'var' was added
	 * if (off > 0) menas that 'imm' was added
	 */
	PTR_TO_PACKET,
	PTR_TO_PACKET_END,	 /* skb->data + headlen */
};

struct bpf_prog;

struct bpf_verifier_ops {
	/* return eBPF function prototype for verification */
	const struct bpf_func_proto *(*get_func_proto)(enum bpf_func_id func_id);

	/* return true if 'size' wide access at offset 'off' within bpf_context
	 * with 'type' (read or write) is allowed
	 */
	bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
				enum bpf_reg_type *reg_type);

	u32 (*convert_ctx_access)(enum bpf_access_type type, int dst_reg,
				  int src_reg, int ctx_off,
				  struct bpf_insn *insn, struct bpf_prog *prog);
};

struct bpf_prog_type_list {
	struct list_head list_node;
	const struct bpf_verifier_ops *ops;
	enum bpf_prog_type type;
};

struct bpf_prog_aux {
	atomic_t refcnt;
	u32 used_map_cnt;
	u32 max_ctx_offset;
	const struct bpf_verifier_ops *ops;
	struct bpf_map **used_maps;
	struct bpf_prog *prog;
	struct user_struct *user;
	union {
		struct work_struct work;
		struct rcu_head	rcu;
	};
};

struct bpf_array {
	struct bpf_map map;
	u32 elem_size;
	/* 'ownership' of prog_array is claimed by the first program that
	 * is going to use this map or by the first program which FD is stored
	 * in the map to make sure that all callers and callees have the same
	 * prog_type and JITed flag
	 */
	enum bpf_prog_type owner_prog_type;
	bool owner_jited;
	union {
		char value[0] __aligned(8);
		void *ptrs[0] __aligned(8);
		void __percpu *pptrs[0] __aligned(8);
	};
};

#define MAX_TAIL_CALL_CNT 32

struct bpf_event_entry {
	struct perf_event *event;
	struct file *perf_file;
	struct file *map_file;
	struct rcu_head rcu;
};

u64 bpf_tail_call(u64 ctx, u64 r2, u64 index, u64 r4, u64 r5);
u64 bpf_get_stackid(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);

bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);

const struct bpf_func_proto *bpf_get_trace_printk_proto(void);

typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
					unsigned long off, unsigned long len);

u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
		     void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);

#ifdef CONFIG_BPF_SYSCALL
DECLARE_PER_CPU(int, bpf_prog_active);

void bpf_register_prog_type(struct bpf_prog_type_list *tl);
void bpf_register_map_type(struct bpf_map_type_list *tl);

struct bpf_prog *bpf_prog_get(u32 ufd);
struct bpf_prog *bpf_prog_get_type(u32 ufd, enum bpf_prog_type type);
struct bpf_prog *bpf_prog_add(struct bpf_prog *prog, int i);
struct bpf_prog *bpf_prog_inc(struct bpf_prog *prog);
void bpf_prog_put(struct bpf_prog *prog);

struct bpf_map *bpf_map_get_with_uref(u32 ufd);
struct bpf_map *__bpf_map_get(struct fd f);
struct bpf_map *bpf_map_inc(struct bpf_map *map, bool uref);
void bpf_map_put_with_uref(struct bpf_map *map);
void bpf_map_put(struct bpf_map *map);
int bpf_map_precharge_memlock(u32 pages);

extern int sysctl_unprivileged_bpf_disabled;

int bpf_map_new_fd(struct bpf_map *map);
int bpf_prog_new_fd(struct bpf_prog *prog);

int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
int bpf_obj_get_user(const char __user *pathname);

int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
			   u64 flags);
int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
			    u64 flags);

int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);

int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
				 void *key, void *value, u64 map_flags);
void bpf_fd_array_map_clear(struct bpf_map *map);

/* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
 * forced to use 'long' read/writes to try to atomically copy long counters.
 * Best-effort only.  No barriers here, since it _will_ race with concurrent
 * updates from BPF programs. Called from bpf syscall and mostly used with
 * size 8 or 16 bytes, so ask compiler to inline it.
 */
static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
{
	const long *lsrc = src;
	long *ldst = dst;

	size /= sizeof(long);
	while (size--)
		*ldst++ = *lsrc++;
}

/* verify correctness of eBPF program */
int bpf_check(struct bpf_prog **fp, union bpf_attr *attr);
#else
static inline void bpf_register_prog_type(struct bpf_prog_type_list *tl)
{
}

static inline struct bpf_prog *bpf_prog_get(u32 ufd)
{
	return ERR_PTR(-EOPNOTSUPP);
}

static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
						 enum bpf_prog_type type)
{
	return ERR_PTR(-EOPNOTSUPP);
}
static inline struct bpf_prog *bpf_prog_add(struct bpf_prog *prog, int i)
{
	return ERR_PTR(-EOPNOTSUPP);
}

static inline void bpf_prog_put(struct bpf_prog *prog)
{
}
static inline struct bpf_prog *bpf_prog_inc(struct bpf_prog *prog)
{
	return ERR_PTR(-EOPNOTSUPP);
}
#endif /* CONFIG_BPF_SYSCALL */

/* verifier prototypes for helper functions called from eBPF programs */
extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
extern const struct bpf_func_proto bpf_map_update_elem_proto;
extern const struct bpf_func_proto bpf_map_delete_elem_proto;

extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
extern const struct bpf_func_proto bpf_tail_call_proto;
extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
extern const struct bpf_func_proto bpf_get_current_comm_proto;
extern const struct bpf_func_proto bpf_skb_vlan_push_proto;
extern const struct bpf_func_proto bpf_skb_vlan_pop_proto;
extern const struct bpf_func_proto bpf_get_stackid_proto;

/* Shared helpers among cBPF and eBPF. */
void bpf_user_rnd_init_once(void);
u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);

#endif /* _LINUX_BPF_H */
Commit	Line	Data
99c55f7d AS	1	/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
	2	*
	3	* This program is free software; you can redistribute it and/or
	4	* modify it under the terms of version 2 of the GNU General Public
	5	* License as published by the Free Software Foundation.
	6	*/
	7	#ifndef _LINUX_BPF_H
	8	#define _LINUX_BPF_H 1
	9
	10	#include <uapi/linux/bpf.h>
	11	#include <linux/workqueue.h>
db20fd2b	12	#include <linux/file.h>
b121d1e7	13	#include <linux/percpu.h>
002245cc	14	#include <linux/err.h>
99c55f7d	15
3b1efb19	16	struct perf_event;
99c55f7d AS	17	struct bpf_map;
	18
	19	/* map is generic key/value storage optionally accesible by eBPF programs */
	20	struct bpf_map_ops {
	21	/* funcs callable from userspace (via syscall) */
	22	struct bpf_map (map_alloc)(union bpf_attr *attr);
61d1b6a4 DB	23	void (map_release)(struct bpf_map map, struct file *map_file);
61d1b6a4 DB	24	void (map_free)(struct bpf_map map);
db20fd2b AS	25	int (map_get_next_key)(struct bpf_map map, void key, void next_key);
	26
	27	/* funcs callable from userspace and from eBPF programs */
	28	void (map_lookup_elem)(struct bpf_map map, void key);
3274f520	29	int (map_update_elem)(struct bpf_map map, void key, void value, u64 flags);
db20fd2b	30	int (map_delete_elem)(struct bpf_map map, void *key);
2a36f0b9 WN	31
2a36f0b9 WN	32	/* funcs called by prog_array and perf_event_array map */
d056a788 DB	33	void (map_fd_get_ptr)(struct bpf_map map, struct file map_file,
	34	int fd);
	35	void (map_fd_put_ptr)(void ptr);
99c55f7d AS	36	};
	37
	38	struct bpf_map {
	39	atomic_t refcnt;
	40	enum bpf_map_type map_type;
	41	u32 key_size;
	42	u32 value_size;
	43	u32 max_entries;
6c905981	44	u32 map_flags;
aaac3ba9 AS	45	u32 pages;
aaac3ba9 AS	46	struct user_struct *user;
a2c83fff	47	const struct bpf_map_ops *ops;
99c55f7d	48	struct work_struct work;
c9da161c	49	atomic_t usercnt;
99c55f7d AS	50	};
	51
	52	struct bpf_map_type_list {
	53	struct list_head list_node;
a2c83fff	54	const struct bpf_map_ops *ops;
99c55f7d AS	55	enum bpf_map_type type;
	56	};
	57
17a52670 AS	58	/* function argument constraints */
17a52670 AS	59	enum bpf_arg_type {
80f1d68c	60	ARG_DONTCARE = 0, /* unused argument in helper function */
17a52670 AS	61
	62	/* the following constraints used to prototype
	63	* bpf_map_lookup/update/delete_elem() functions
	64	*/
	65	ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
	66	ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
	67	ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
	68
	69	/* the following constraints used to prototype bpf_memcmp() and other
	70	* functions that access data on eBPF program stack
	71	*/
	72	ARG_PTR_TO_STACK, /* any pointer to eBPF program stack */
435faee1 DB	73	ARG_PTR_TO_RAW_STACK, /* any pointer to eBPF program stack, area does not
	74	* need to be initialized, helper function must fill
	75	* all bytes or clear them in error case.
	76	*/
	77
17a52670	78	ARG_CONST_STACK_SIZE, /* number of bytes accessed from stack */
8e2fe1d9	79	ARG_CONST_STACK_SIZE_OR_ZERO, /* number of bytes accessed from stack or 0 */
80f1d68c	80
608cd71a	81	ARG_PTR_TO_CTX, /* pointer to context */
80f1d68c	82	ARG_ANYTHING, /* any (initialized) argument is ok */
17a52670 AS	83	};
	84
	85	/* type of values returned from helper functions */
	86	enum bpf_return_type {
	87	RET_INTEGER, /* function returns integer */
	88	RET_VOID, /* function doesn't return anything */
	89	RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */
	90	};
	91
09756af4 AS	92	/* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
	93	* to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
	94	* instructions after verifying
	95	*/
	96	struct bpf_func_proto {
	97	u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
	98	bool gpl_only;
17a52670 AS	99	enum bpf_return_type ret_type;
	100	enum bpf_arg_type arg1_type;
	101	enum bpf_arg_type arg2_type;
	102	enum bpf_arg_type arg3_type;
	103	enum bpf_arg_type arg4_type;
	104	enum bpf_arg_type arg5_type;
	105	};
	106
	107	/* bpf_context is intentionally undefined structure. Pointer to bpf_context is
	108	* the first argument to eBPF programs.
	109	* For socket filters: 'struct bpf_context ' == 'struct sk_buff '
	110	*/
	111	struct bpf_context;
	112
	113	enum bpf_access_type {
	114	BPF_READ = 1,
	115	BPF_WRITE = 2
09756af4 AS	116	};
09756af4 AS	117
19de99f7 AS	118	/* types of values stored in eBPF registers */
	119	enum bpf_reg_type {
	120	NOT_INIT = 0, /* nothing was written into register */
	121	UNKNOWN_VALUE, /* reg doesn't contain a valid pointer */
	122	PTR_TO_CTX, /* reg points to bpf_context */
	123	CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
	124	PTR_TO_MAP_VALUE, /* reg points to map element value */
	125	PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */
	126	FRAME_PTR, /* reg == frame_pointer */
	127	PTR_TO_STACK, /* reg == frame_pointer + imm */
	128	CONST_IMM, /* constant integer value */
	129
	130	/* PTR_TO_PACKET represents:
	131	* skb->data
	132	* skb->data + imm
	133	* skb->data + (u16) var
	134	* skb->data + (u16) var + imm
	135	* if (range > 0) then [ptr, ptr + range - off) is safe to access
	136	* if (id > 0) means that some 'var' was added
	137	* if (off > 0) menas that 'imm' was added
	138	*/
	139	PTR_TO_PACKET,
	140	PTR_TO_PACKET_END, /* skb->data + headlen */
	141	};
	142
ff936a04 AS	143	struct bpf_prog;
ff936a04 AS	144
09756af4 AS	145	struct bpf_verifier_ops {
	146	/* return eBPF function prototype for verification */
	147	const struct bpf_func_proto (get_func_proto)(enum bpf_func_id func_id);
17a52670 AS	148
	149	/* return true if 'size' wide access at offset 'off' within bpf_context
	150	* with 'type' (read or write) is allowed
	151	*/
19de99f7 AS	152	bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
19de99f7 AS	153	enum bpf_reg_type *reg_type);
9bac3d6d	154
d691f9e8 AS	155	u32 (*convert_ctx_access)(enum bpf_access_type type, int dst_reg,
d691f9e8 AS	156	int src_reg, int ctx_off,
ff936a04	157	struct bpf_insn insn, struct bpf_prog prog);
09756af4 AS	158	};
	159
	160	struct bpf_prog_type_list {
	161	struct list_head list_node;
a2c83fff	162	const struct bpf_verifier_ops *ops;
09756af4 AS	163	enum bpf_prog_type type;
	164	};
	165
09756af4 AS	166	struct bpf_prog_aux {
09756af4 AS	167	atomic_t refcnt;
24701ece	168	u32 used_map_cnt;
32bbe007	169	u32 max_ctx_offset;
a2c83fff	170	const struct bpf_verifier_ops *ops;
09756af4	171	struct bpf_map **used_maps;
09756af4	172	struct bpf_prog *prog;
aaac3ba9	173	struct user_struct *user;
abf2e7d6 AS	174	union {
	175	struct work_struct work;
	176	struct rcu_head rcu;
	177	};
09756af4 AS	178	};
09756af4 AS	179
04fd61ab AS	180	struct bpf_array {
	181	struct bpf_map map;
	182	u32 elem_size;
	183	/* 'ownership' of prog_array is claimed by the first program that
	184	* is going to use this map or by the first program which FD is stored
	185	* in the map to make sure that all callers and callees have the same
	186	* prog_type and JITed flag
	187	*/
	188	enum bpf_prog_type owner_prog_type;
	189	bool owner_jited;
	190	union {
	191	char value[0] __aligned(8);
2a36f0b9	192	void *ptrs[0] __aligned(8);
a10423b8	193	void __percpu *pptrs[0] __aligned(8);
04fd61ab AS	194	};
04fd61ab AS	195	};
3b1efb19	196
04fd61ab AS	197	#define MAX_TAIL_CALL_CNT 32
04fd61ab AS	198
3b1efb19 DB	199	struct bpf_event_entry {
	200	struct perf_event *event;
	201	struct file *perf_file;
	202	struct file *map_file;
	203	struct rcu_head rcu;
	204	};
	205
04fd61ab	206	u64 bpf_tail_call(u64 ctx, u64 r2, u64 index, u64 r4, u64 r5);
9940d67c	207	u64 bpf_get_stackid(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
d056a788	208
04fd61ab	209	bool bpf_prog_array_compatible(struct bpf_array array, const struct bpf_prog fp);
bd570ff9	210
0756ea3e	211	const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
555c8a86 DB	212
555c8a86 DB	213	typedef unsigned long (bpf_ctx_copy_t)(void dst, const void *src,
aa7145c1	214	unsigned long off, unsigned long len);
555c8a86 DB	215
	216	u64 bpf_event_output(struct bpf_map map, u64 flags, void meta, u64 meta_size,
	217	void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
04fd61ab	218
89aa0758	219	#ifdef CONFIG_BPF_SYSCALL
b121d1e7 AS	220	DECLARE_PER_CPU(int, bpf_prog_active);
b121d1e7 AS	221
0fc174de	222	void bpf_register_prog_type(struct bpf_prog_type_list *tl);
61e021f3	223	void bpf_register_map_type(struct bpf_map_type_list *tl);
0fc174de	224
0fc174de	225	struct bpf_prog *bpf_prog_get(u32 ufd);
113214be	226	struct bpf_prog *bpf_prog_get_type(u32 ufd, enum bpf_prog_type type);
59d3656d	227	struct bpf_prog bpf_prog_add(struct bpf_prog prog, int i);
92117d84	228	struct bpf_prog bpf_prog_inc(struct bpf_prog prog);
61e021f3 DB	229	void bpf_prog_put(struct bpf_prog *prog);
61e021f3 DB	230
c9da161c	231	struct bpf_map *bpf_map_get_with_uref(u32 ufd);
c2101297	232	struct bpf_map *__bpf_map_get(struct fd f);
92117d84	233	struct bpf_map bpf_map_inc(struct bpf_map map, bool uref);
c9da161c	234	void bpf_map_put_with_uref(struct bpf_map *map);
61e021f3	235	void bpf_map_put(struct bpf_map *map);
6c905981	236	int bpf_map_precharge_memlock(u32 pages);
61e021f3	237
1be7f75d AS	238	extern int sysctl_unprivileged_bpf_disabled;
1be7f75d AS	239
b2197755 DB	240	int bpf_map_new_fd(struct bpf_map *map);
	241	int bpf_prog_new_fd(struct bpf_prog *prog);
	242
	243	int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
	244	int bpf_obj_get_user(const char __user *pathname);
	245
15a07b33 AS	246	int bpf_percpu_hash_copy(struct bpf_map map, void key, void *value);
	247	int bpf_percpu_array_copy(struct bpf_map map, void key, void *value);
	248	int bpf_percpu_hash_update(struct bpf_map map, void key, void *value,
	249	u64 flags);
	250	int bpf_percpu_array_update(struct bpf_map map, void key, void *value,
	251	u64 flags);
d056a788	252
557c0c6e	253	int bpf_stackmap_copy(struct bpf_map map, void key, void *value);
15a07b33	254
d056a788 DB	255	int bpf_fd_array_map_update_elem(struct bpf_map map, struct file map_file,
	256	void key, void value, u64 map_flags);
	257	void bpf_fd_array_map_clear(struct bpf_map *map);
	258
15a07b33 AS	259	/* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
	260	* forced to use 'long' read/writes to try to atomically copy long counters.
	261	* Best-effort only. No barriers here, since it _will_ race with concurrent
	262	* updates from BPF programs. Called from bpf syscall and mostly used with
	263	* size 8 or 16 bytes, so ask compiler to inline it.
	264	*/
	265	static inline void bpf_long_memcpy(void dst, const void src, u32 size)
	266	{
	267	const long *lsrc = src;
	268	long *ldst = dst;
	269
	270	size /= sizeof(long);
	271	while (size--)
	272	ldst++ = lsrc++;
	273	}
	274
61e021f3	275	/* verify correctness of eBPF program */
9bac3d6d	276	int bpf_check(struct bpf_prog *fp, union bpf_attr attr);
89aa0758	277	#else
0fc174de DB	278	static inline void bpf_register_prog_type(struct bpf_prog_type_list *tl)
	279	{
	280	}
	281
	282	static inline struct bpf_prog *bpf_prog_get(u32 ufd)
	283	{
	284	return ERR_PTR(-EOPNOTSUPP);
	285	}
	286
113214be DB	287	static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
	288	enum bpf_prog_type type)
	289	{
	290	return ERR_PTR(-EOPNOTSUPP);
	291	}
cc2e0b3f BB	292	static inline struct bpf_prog bpf_prog_add(struct bpf_prog prog, int i)
	293	{
	294	return ERR_PTR(-EOPNOTSUPP);
	295	}
113214be	296
0fc174de DB	297	static inline void bpf_prog_put(struct bpf_prog *prog)
	298	{
	299	}
aa6a5f3c AS	300	static inline struct bpf_prog bpf_prog_inc(struct bpf_prog prog)
	301	{
	302	return ERR_PTR(-EOPNOTSUPP);
	303	}
61e021f3	304	#endif /* CONFIG_BPF_SYSCALL */
09756af4	305
d0003ec0	306	/* verifier prototypes for helper functions called from eBPF programs */
a2c83fff DB	307	extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
	308	extern const struct bpf_func_proto bpf_map_update_elem_proto;
	309	extern const struct bpf_func_proto bpf_map_delete_elem_proto;
d0003ec0	310
03e69b50	311	extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
c04167ce	312	extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
04fd61ab	313	extern const struct bpf_func_proto bpf_tail_call_proto;
17ca8cbf	314	extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
ffeedafb AS	315	extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
	316	extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
	317	extern const struct bpf_func_proto bpf_get_current_comm_proto;
4e10df9a AS	318	extern const struct bpf_func_proto bpf_skb_vlan_push_proto;
4e10df9a AS	319	extern const struct bpf_func_proto bpf_skb_vlan_pop_proto;
d5a3b1f6	320	extern const struct bpf_func_proto bpf_get_stackid_proto;
03e69b50	321
3ad00405 DB	322	/* Shared helpers among cBPF and eBPF. */
	323	void bpf_user_rnd_init_once(void);
	324	u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
	325
99c55f7d	326	#endif /* _LINUX_BPF_H */