[mirror_ubuntu-artful-kernel.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>
#include <linux/rbtree_latch.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_MEM,		/* pointer to valid memory (stack, packet, map value) */
	ARG_PTR_TO_UNINIT_MEM,	/* pointer to memory does not need to be initialized,
				 * helper function must fill all bytes or clear
				 * them in error case.
				 */

	ARG_CONST_SIZE,		/* number of bytes accessed from memory */
	ARG_CONST_SIZE_OR_ZERO,	/* number of bytes accessed from memory 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;
	bool pkt_access;
	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 */

	/* PTR_TO_MAP_VALUE_ADJ is used for doing pointer math inside of a map
	 * elem value.  We only allow this if we can statically verify that
	 * access from this register are going to fall within the size of the
	 * map element.
	 */
	PTR_TO_MAP_VALUE_ADJ,
};

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);
	int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
			    const struct bpf_prog *prog);
	u32 (*convert_ctx_access)(enum bpf_access_type type,
				  const struct bpf_insn *src,
				  struct bpf_insn *dst,
				  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;
	struct latch_tree_node ksym_tnode;
	struct list_head ksym_lnode;
	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);
int bpf_prog_calc_tag(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 * __must_check bpf_prog_add(struct bpf_prog *prog, int i);
void bpf_prog_sub(struct bpf_prog *prog, int i);
struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog);
void bpf_prog_put(struct bpf_prog *prog);
int __bpf_prog_charge(struct user_struct *user, u32 pages);
void __bpf_prog_uncharge(struct user_struct *user, u32 pages);

struct bpf_map *bpf_map_get_with_uref(u32 ufd);
struct bpf_map *__bpf_map_get(struct fd f);
struct bpf_map * __must_check 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);
void *bpf_map_area_alloc(size_t size);
void bpf_map_area_free(void *base);

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 * __must_check bpf_prog_add(struct bpf_prog *prog,
							  int i)
{
	return ERR_PTR(-EOPNOTSUPP);
}

static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
{
}

static inline void bpf_prog_put(struct bpf_prog *prog)
{
}

static inline struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog)
{
	return ERR_PTR(-EOPNOTSUPP);
}

static inline int __bpf_prog_charge(struct user_struct *user, u32 pages)
{
	return 0;
}

static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
{
}
#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_get_numa_node_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>
74451e66	11
99c55f7d	12	#include <linux/workqueue.h>
db20fd2b	13	#include <linux/file.h>
b121d1e7	14	#include <linux/percpu.h>
002245cc	15	#include <linux/err.h>
74451e66	16	#include <linux/rbtree_latch.h>
99c55f7d	17
3b1efb19	18	struct perf_event;
99c55f7d AS	19	struct bpf_map;
	20
	21	/* map is generic key/value storage optionally accesible by eBPF programs */
	22	struct bpf_map_ops {
	23	/* funcs callable from userspace (via syscall) */
	24	struct bpf_map (map_alloc)(union bpf_attr *attr);
61d1b6a4 DB	25	void (map_release)(struct bpf_map map, struct file *map_file);
61d1b6a4 DB	26	void (map_free)(struct bpf_map map);
db20fd2b AS	27	int (map_get_next_key)(struct bpf_map map, void key, void next_key);
	28
	29	/* funcs callable from userspace and from eBPF programs */
	30	void (map_lookup_elem)(struct bpf_map map, void key);
3274f520	31	int (map_update_elem)(struct bpf_map map, void key, void value, u64 flags);
db20fd2b	32	int (map_delete_elem)(struct bpf_map map, void *key);
2a36f0b9 WN	33
2a36f0b9 WN	34	/* funcs called by prog_array and perf_event_array map */
d056a788 DB	35	void (map_fd_get_ptr)(struct bpf_map map, struct file map_file,
	36	int fd);
	37	void (map_fd_put_ptr)(void ptr);
99c55f7d AS	38	};
	39
	40	struct bpf_map {
	41	atomic_t refcnt;
	42	enum bpf_map_type map_type;
	43	u32 key_size;
	44	u32 value_size;
	45	u32 max_entries;
6c905981	46	u32 map_flags;
aaac3ba9 AS	47	u32 pages;
aaac3ba9 AS	48	struct user_struct *user;
a2c83fff	49	const struct bpf_map_ops *ops;
99c55f7d	50	struct work_struct work;
c9da161c	51	atomic_t usercnt;
99c55f7d AS	52	};
	53
	54	struct bpf_map_type_list {
	55	struct list_head list_node;
a2c83fff	56	const struct bpf_map_ops *ops;
99c55f7d AS	57	enum bpf_map_type type;
	58	};
	59
17a52670 AS	60	/* function argument constraints */
17a52670 AS	61	enum bpf_arg_type {
80f1d68c	62	ARG_DONTCARE = 0, /* unused argument in helper function */
17a52670 AS	63
	64	/* the following constraints used to prototype
	65	* bpf_map_lookup/update/delete_elem() functions
	66	*/
	67	ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
	68	ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
	69	ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
	70
	71	/* the following constraints used to prototype bpf_memcmp() and other
	72	* functions that access data on eBPF program stack
	73	*/
39f19ebb AS	74	ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
	75	ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized,
	76	* helper function must fill all bytes or clear
	77	* them in error case.
435faee1 DB	78	*/
435faee1 DB	79
39f19ebb AS	80	ARG_CONST_SIZE, /* number of bytes accessed from memory */
39f19ebb AS	81	ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
80f1d68c	82
608cd71a	83	ARG_PTR_TO_CTX, /* pointer to context */
80f1d68c	84	ARG_ANYTHING, /* any (initialized) argument is ok */
17a52670 AS	85	};
	86
	87	/* type of values returned from helper functions */
	88	enum bpf_return_type {
	89	RET_INTEGER, /* function returns integer */
	90	RET_VOID, /* function doesn't return anything */
	91	RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */
	92	};
	93
09756af4 AS	94	/* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
	95	* to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
	96	* instructions after verifying
	97	*/
	98	struct bpf_func_proto {
	99	u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
	100	bool gpl_only;
36bbef52	101	bool pkt_access;
17a52670 AS	102	enum bpf_return_type ret_type;
	103	enum bpf_arg_type arg1_type;
	104	enum bpf_arg_type arg2_type;
	105	enum bpf_arg_type arg3_type;
	106	enum bpf_arg_type arg4_type;
	107	enum bpf_arg_type arg5_type;
	108	};
	109
	110	/* bpf_context is intentionally undefined structure. Pointer to bpf_context is
	111	* the first argument to eBPF programs.
	112	* For socket filters: 'struct bpf_context ' == 'struct sk_buff '
	113	*/
	114	struct bpf_context;
	115
	116	enum bpf_access_type {
	117	BPF_READ = 1,
	118	BPF_WRITE = 2
09756af4 AS	119	};
09756af4 AS	120
19de99f7 AS	121	/* types of values stored in eBPF registers */
	122	enum bpf_reg_type {
	123	NOT_INIT = 0, /* nothing was written into register */
	124	UNKNOWN_VALUE, /* reg doesn't contain a valid pointer */
	125	PTR_TO_CTX, /* reg points to bpf_context */
	126	CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
	127	PTR_TO_MAP_VALUE, /* reg points to map element value */
	128	PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */
	129	FRAME_PTR, /* reg == frame_pointer */
	130	PTR_TO_STACK, /* reg == frame_pointer + imm */
	131	CONST_IMM, /* constant integer value */
	132
	133	/* PTR_TO_PACKET represents:
	134	* skb->data
	135	* skb->data + imm
	136	* skb->data + (u16) var
	137	* skb->data + (u16) var + imm
	138	* if (range > 0) then [ptr, ptr + range - off) is safe to access
	139	* if (id > 0) means that some 'var' was added
	140	* if (off > 0) menas that 'imm' was added
	141	*/
	142	PTR_TO_PACKET,
	143	PTR_TO_PACKET_END, /* skb->data + headlen */
48461135 JB	144
	145	/* PTR_TO_MAP_VALUE_ADJ is used for doing pointer math inside of a map
	146	* elem value. We only allow this if we can statically verify that
	147	* access from this register are going to fall within the size of the
	148	* map element.
	149	*/
	150	PTR_TO_MAP_VALUE_ADJ,
19de99f7 AS	151	};
19de99f7 AS	152
ff936a04 AS	153	struct bpf_prog;
ff936a04 AS	154
09756af4 AS	155	struct bpf_verifier_ops {
	156	/* return eBPF function prototype for verification */
	157	const struct bpf_func_proto (get_func_proto)(enum bpf_func_id func_id);
17a52670 AS	158
	159	/* return true if 'size' wide access at offset 'off' within bpf_context
	160	* with 'type' (read or write) is allowed
	161	*/
19de99f7 AS	162	bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
19de99f7 AS	163	enum bpf_reg_type *reg_type);
36bbef52 DB	164	int (gen_prologue)(struct bpf_insn insn, bool direct_write,
36bbef52 DB	165	const struct bpf_prog *prog);
6b8cc1d1 DB	166	u32 (*convert_ctx_access)(enum bpf_access_type type,
	167	const struct bpf_insn *src,
	168	struct bpf_insn *dst,
	169	struct bpf_prog *prog);
09756af4 AS	170	};
	171
	172	struct bpf_prog_type_list {
	173	struct list_head list_node;
a2c83fff	174	const struct bpf_verifier_ops *ops;
09756af4 AS	175	enum bpf_prog_type type;
	176	};
	177
09756af4 AS	178	struct bpf_prog_aux {
09756af4 AS	179	atomic_t refcnt;
24701ece	180	u32 used_map_cnt;
32bbe007	181	u32 max_ctx_offset;
74451e66 DB	182	struct latch_tree_node ksym_tnode;
74451e66 DB	183	struct list_head ksym_lnode;
a2c83fff	184	const struct bpf_verifier_ops *ops;
09756af4	185	struct bpf_map **used_maps;
09756af4	186	struct bpf_prog *prog;
aaac3ba9	187	struct user_struct *user;
abf2e7d6 AS	188	union {
	189	struct work_struct work;
	190	struct rcu_head rcu;
	191	};
09756af4 AS	192	};
09756af4 AS	193
04fd61ab AS	194	struct bpf_array {
	195	struct bpf_map map;
	196	u32 elem_size;
	197	/* 'ownership' of prog_array is claimed by the first program that
	198	* is going to use this map or by the first program which FD is stored
	199	* in the map to make sure that all callers and callees have the same
	200	* prog_type and JITed flag
	201	*/
	202	enum bpf_prog_type owner_prog_type;
	203	bool owner_jited;
	204	union {
	205	char value[0] __aligned(8);
2a36f0b9	206	void *ptrs[0] __aligned(8);
a10423b8	207	void __percpu *pptrs[0] __aligned(8);
04fd61ab AS	208	};
04fd61ab AS	209	};
3b1efb19	210
04fd61ab AS	211	#define MAX_TAIL_CALL_CNT 32
04fd61ab AS	212
3b1efb19 DB	213	struct bpf_event_entry {
	214	struct perf_event *event;
	215	struct file *perf_file;
	216	struct file *map_file;
	217	struct rcu_head rcu;
	218	};
	219
04fd61ab	220	u64 bpf_tail_call(u64 ctx, u64 r2, u64 index, u64 r4, u64 r5);
9940d67c	221	u64 bpf_get_stackid(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
d056a788	222
04fd61ab	223	bool bpf_prog_array_compatible(struct bpf_array array, const struct bpf_prog fp);
f1f7714e	224	int bpf_prog_calc_tag(struct bpf_prog *fp);
bd570ff9	225
0756ea3e	226	const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
555c8a86 DB	227
555c8a86 DB	228	typedef unsigned long (bpf_ctx_copy_t)(void dst, const void *src,
aa7145c1	229	unsigned long off, unsigned long len);
555c8a86 DB	230
	231	u64 bpf_event_output(struct bpf_map map, u64 flags, void meta, u64 meta_size,
	232	void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
04fd61ab	233
89aa0758	234	#ifdef CONFIG_BPF_SYSCALL
b121d1e7 AS	235	DECLARE_PER_CPU(int, bpf_prog_active);
b121d1e7 AS	236
0fc174de	237	void bpf_register_prog_type(struct bpf_prog_type_list *tl);
61e021f3	238	void bpf_register_map_type(struct bpf_map_type_list *tl);
0fc174de	239
0fc174de	240	struct bpf_prog *bpf_prog_get(u32 ufd);
113214be	241	struct bpf_prog *bpf_prog_get_type(u32 ufd, enum bpf_prog_type type);
6d67942d	242	struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, int i);
c540594f	243	void bpf_prog_sub(struct bpf_prog *prog, int i);
6d67942d	244	struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog);
61e021f3	245	void bpf_prog_put(struct bpf_prog *prog);
5ccb071e DB	246	int __bpf_prog_charge(struct user_struct *user, u32 pages);
5ccb071e DB	247	void __bpf_prog_uncharge(struct user_struct *user, u32 pages);
61e021f3	248
c9da161c	249	struct bpf_map *bpf_map_get_with_uref(u32 ufd);
c2101297	250	struct bpf_map *__bpf_map_get(struct fd f);
6d67942d	251	struct bpf_map * __must_check bpf_map_inc(struct bpf_map *map, bool uref);
c9da161c	252	void bpf_map_put_with_uref(struct bpf_map *map);
61e021f3	253	void bpf_map_put(struct bpf_map *map);
6c905981	254	int bpf_map_precharge_memlock(u32 pages);
d407bd25 DB	255	void *bpf_map_area_alloc(size_t size);
d407bd25 DB	256	void bpf_map_area_free(void *base);
61e021f3	257
1be7f75d AS	258	extern int sysctl_unprivileged_bpf_disabled;
1be7f75d AS	259
b2197755 DB	260	int bpf_map_new_fd(struct bpf_map *map);
	261	int bpf_prog_new_fd(struct bpf_prog *prog);
	262
	263	int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
	264	int bpf_obj_get_user(const char __user *pathname);
	265
15a07b33 AS	266	int bpf_percpu_hash_copy(struct bpf_map map, void key, void *value);
	267	int bpf_percpu_array_copy(struct bpf_map map, void key, void *value);
	268	int bpf_percpu_hash_update(struct bpf_map map, void key, void *value,
	269	u64 flags);
	270	int bpf_percpu_array_update(struct bpf_map map, void key, void *value,
	271	u64 flags);
d056a788	272
557c0c6e	273	int bpf_stackmap_copy(struct bpf_map map, void key, void *value);
15a07b33	274
d056a788 DB	275	int bpf_fd_array_map_update_elem(struct bpf_map map, struct file map_file,
	276	void key, void value, u64 map_flags);
	277	void bpf_fd_array_map_clear(struct bpf_map *map);
	278
15a07b33 AS	279	/* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
	280	* forced to use 'long' read/writes to try to atomically copy long counters.
	281	* Best-effort only. No barriers here, since it _will_ race with concurrent
	282	* updates from BPF programs. Called from bpf syscall and mostly used with
	283	* size 8 or 16 bytes, so ask compiler to inline it.
	284	*/
	285	static inline void bpf_long_memcpy(void dst, const void src, u32 size)
	286	{
	287	const long *lsrc = src;
	288	long *ldst = dst;
	289
	290	size /= sizeof(long);
	291	while (size--)
	292	ldst++ = lsrc++;
	293	}
	294
61e021f3	295	/* verify correctness of eBPF program */
9bac3d6d	296	int bpf_check(struct bpf_prog *fp, union bpf_attr attr);
89aa0758	297	#else
0fc174de DB	298	static inline void bpf_register_prog_type(struct bpf_prog_type_list *tl)
	299	{
	300	}
	301
	302	static inline struct bpf_prog *bpf_prog_get(u32 ufd)
	303	{
	304	return ERR_PTR(-EOPNOTSUPP);
	305	}
	306
113214be DB	307	static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
	308	enum bpf_prog_type type)
	309	{
	310	return ERR_PTR(-EOPNOTSUPP);
	311	}
6d67942d DB	312	static inline struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog,
6d67942d DB	313	int i)
cc2e0b3f BB	314	{
	315	return ERR_PTR(-EOPNOTSUPP);
	316	}
113214be	317
c540594f DB	318	static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
	319	{
	320	}
	321
0fc174de DB	322	static inline void bpf_prog_put(struct bpf_prog *prog)
	323	{
	324	}
6d67942d DB	325
6d67942d DB	326	static inline struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog)
aa6a5f3c AS	327	{
	328	return ERR_PTR(-EOPNOTSUPP);
	329	}
5ccb071e DB	330
	331	static inline int __bpf_prog_charge(struct user_struct *user, u32 pages)
	332	{
	333	return 0;
	334	}
	335
	336	static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
	337	{
	338	}
61e021f3	339	#endif /* CONFIG_BPF_SYSCALL */
09756af4	340
d0003ec0	341	/* verifier prototypes for helper functions called from eBPF programs */
a2c83fff DB	342	extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
	343	extern const struct bpf_func_proto bpf_map_update_elem_proto;
	344	extern const struct bpf_func_proto bpf_map_delete_elem_proto;
d0003ec0	345
03e69b50	346	extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
c04167ce	347	extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
2d0e30c3	348	extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
04fd61ab	349	extern const struct bpf_func_proto bpf_tail_call_proto;
17ca8cbf	350	extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
ffeedafb AS	351	extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
	352	extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
	353	extern const struct bpf_func_proto bpf_get_current_comm_proto;
4e10df9a AS	354	extern const struct bpf_func_proto bpf_skb_vlan_push_proto;
4e10df9a AS	355	extern const struct bpf_func_proto bpf_skb_vlan_pop_proto;
d5a3b1f6	356	extern const struct bpf_func_proto bpf_get_stackid_proto;
03e69b50	357
3ad00405 DB	358	/* Shared helpers among cBPF and eBPF. */
	359	void bpf_user_rnd_init_once(void);
	360	u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
	361
99c55f7d	362	#endif /* _LINUX_BPF_H */