[linux-2.6-block.git] / tools / lib / bpf / libbpf.h

/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */

/*
 * Common eBPF ELF object loading operations.
 *
 * Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org>
 * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
 * Copyright (C) 2015 Huawei Inc.
 */
#ifndef __LIBBPF_LIBBPF_H
#define __LIBBPF_LIBBPF_H

#include <stdarg.h>
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <sys/types.h>  // for size_t
#include <linux/bpf.h>

#ifdef __cplusplus
extern "C" {
#endif

#ifndef LIBBPF_API
#define LIBBPF_API __attribute__((visibility("default")))
#endif

enum libbpf_errno {
	__LIBBPF_ERRNO__START = 4000,

	/* Something wrong in libelf */
	LIBBPF_ERRNO__LIBELF = __LIBBPF_ERRNO__START,
	LIBBPF_ERRNO__FORMAT,	/* BPF object format invalid */
	LIBBPF_ERRNO__KVERSION,	/* Incorrect or no 'version' section */
	LIBBPF_ERRNO__ENDIAN,	/* Endian mismatch */
	LIBBPF_ERRNO__INTERNAL,	/* Internal error in libbpf */
	LIBBPF_ERRNO__RELOC,	/* Relocation failed */
	LIBBPF_ERRNO__LOAD,	/* Load program failure for unknown reason */
	LIBBPF_ERRNO__VERIFY,	/* Kernel verifier blocks program loading */
	LIBBPF_ERRNO__PROG2BIG,	/* Program too big */
	LIBBPF_ERRNO__KVER,	/* Incorrect kernel version */
	LIBBPF_ERRNO__PROGTYPE,	/* Kernel doesn't support this program type */
	LIBBPF_ERRNO__WRNGPID,	/* Wrong pid in netlink message */
	LIBBPF_ERRNO__INVSEQ,	/* Invalid netlink sequence */
	LIBBPF_ERRNO__NLPARSE,	/* netlink parsing error */
	__LIBBPF_ERRNO__END,
};

LIBBPF_API int libbpf_strerror(int err, char *buf, size_t size);

enum libbpf_print_level {
        LIBBPF_WARN,
        LIBBPF_INFO,
        LIBBPF_DEBUG,
};

typedef int (*libbpf_print_fn_t)(enum libbpf_print_level level,
				 const char *, va_list ap);

LIBBPF_API void libbpf_set_print(libbpf_print_fn_t fn);

/* Hide internal to user */
struct bpf_object;

struct bpf_object_open_attr {
	const char *file;
	enum bpf_prog_type prog_type;
};

LIBBPF_API struct bpf_object *bpf_object__open(const char *path);
LIBBPF_API struct bpf_object *
bpf_object__open_xattr(struct bpf_object_open_attr *attr);
struct bpf_object *__bpf_object__open_xattr(struct bpf_object_open_attr *attr,
					    int flags);
LIBBPF_API struct bpf_object *bpf_object__open_buffer(void *obj_buf,
						      size_t obj_buf_sz,
						      const char *name);
int bpf_object__section_size(const struct bpf_object *obj, const char *name,
			     __u32 *size);
int bpf_object__variable_offset(const struct bpf_object *obj, const char *name,
				__u32 *off);
LIBBPF_API int bpf_object__pin_maps(struct bpf_object *obj, const char *path);
LIBBPF_API int bpf_object__unpin_maps(struct bpf_object *obj,
				      const char *path);
LIBBPF_API int bpf_object__pin_programs(struct bpf_object *obj,
					const char *path);
LIBBPF_API int bpf_object__unpin_programs(struct bpf_object *obj,
					  const char *path);
LIBBPF_API int bpf_object__pin(struct bpf_object *object, const char *path);
LIBBPF_API void bpf_object__close(struct bpf_object *object);

/* Load/unload object into/from kernel */
LIBBPF_API int bpf_object__load(struct bpf_object *obj);
LIBBPF_API int bpf_object__unload(struct bpf_object *obj);
LIBBPF_API const char *bpf_object__name(struct bpf_object *obj);
LIBBPF_API unsigned int bpf_object__kversion(struct bpf_object *obj);

struct btf;
LIBBPF_API struct btf *bpf_object__btf(struct bpf_object *obj);
LIBBPF_API int bpf_object__btf_fd(const struct bpf_object *obj);

LIBBPF_API struct bpf_program *
bpf_object__find_program_by_title(struct bpf_object *obj, const char *title);

LIBBPF_API struct bpf_object *bpf_object__next(struct bpf_object *prev);
#define bpf_object__for_each_safe(pos, tmp)			\
	for ((pos) = bpf_object__next(NULL),		\
		(tmp) = bpf_object__next(pos);		\
	     (pos) != NULL;				\
	     (pos) = (tmp), (tmp) = bpf_object__next(tmp))

typedef void (*bpf_object_clear_priv_t)(struct bpf_object *, void *);
LIBBPF_API int bpf_object__set_priv(struct bpf_object *obj, void *priv,
				    bpf_object_clear_priv_t clear_priv);
LIBBPF_API void *bpf_object__priv(struct bpf_object *prog);

LIBBPF_API int
libbpf_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type,
			 enum bpf_attach_type *expected_attach_type);
LIBBPF_API int libbpf_attach_type_by_name(const char *name,
					  enum bpf_attach_type *attach_type);

/* Accessors of bpf_program */
struct bpf_program;
LIBBPF_API struct bpf_program *bpf_program__next(struct bpf_program *prog,
						 struct bpf_object *obj);

#define bpf_object__for_each_program(pos, obj)		\
	for ((pos) = bpf_program__next(NULL, (obj));	\
	     (pos) != NULL;				\
	     (pos) = bpf_program__next((pos), (obj)))

LIBBPF_API struct bpf_program *bpf_program__prev(struct bpf_program *prog,
						 struct bpf_object *obj);

typedef void (*bpf_program_clear_priv_t)(struct bpf_program *,
					 void *);

LIBBPF_API int bpf_program__set_priv(struct bpf_program *prog, void *priv,
				     bpf_program_clear_priv_t clear_priv);

LIBBPF_API void *bpf_program__priv(struct bpf_program *prog);
LIBBPF_API void bpf_program__set_ifindex(struct bpf_program *prog,
					 __u32 ifindex);

LIBBPF_API const char *bpf_program__title(struct bpf_program *prog,
					  bool needs_copy);

LIBBPF_API int bpf_program__load(struct bpf_program *prog, char *license,
				 __u32 kern_version);
LIBBPF_API int bpf_program__fd(struct bpf_program *prog);
LIBBPF_API int bpf_program__pin_instance(struct bpf_program *prog,
					 const char *path,
					 int instance);
LIBBPF_API int bpf_program__unpin_instance(struct bpf_program *prog,
					   const char *path,
					   int instance);
LIBBPF_API int bpf_program__pin(struct bpf_program *prog, const char *path);
LIBBPF_API int bpf_program__unpin(struct bpf_program *prog, const char *path);
LIBBPF_API void bpf_program__unload(struct bpf_program *prog);

struct bpf_insn;

/*
 * Libbpf allows callers to adjust BPF programs before being loaded
 * into kernel. One program in an object file can be transformed into
 * multiple variants to be attached to different hooks.
 *
 * bpf_program_prep_t, bpf_program__set_prep and bpf_program__nth_fd
 * form an API for this purpose.
 *
 * - bpf_program_prep_t:
 *   Defines a 'preprocessor', which is a caller defined function
 *   passed to libbpf through bpf_program__set_prep(), and will be
 *   called before program is loaded. The processor should adjust
 *   the program one time for each instance according to the instance id
 *   passed to it.
 *
 * - bpf_program__set_prep:
 *   Attaches a preprocessor to a BPF program. The number of instances
 *   that should be created is also passed through this function.
 *
 * - bpf_program__nth_fd:
 *   After the program is loaded, get resulting FD of a given instance
 *   of the BPF program.
 *
 * If bpf_program__set_prep() is not used, the program would be loaded
 * without adjustment during bpf_object__load(). The program has only
 * one instance. In this case bpf_program__fd(prog) is equal to
 * bpf_program__nth_fd(prog, 0).
 */

struct bpf_prog_prep_result {
	/*
	 * If not NULL, load new instruction array.
	 * If set to NULL, don't load this instance.
	 */
	struct bpf_insn *new_insn_ptr;
	int new_insn_cnt;

	/* If not NULL, result FD is written to it. */
	int *pfd;
};

/*
 * Parameters of bpf_program_prep_t:
 *  - prog:	The bpf_program being loaded.
 *  - n:	Index of instance being generated.
 *  - insns:	BPF instructions array.
 *  - insns_cnt:Number of instructions in insns.
 *  - res:	Output parameter, result of transformation.
 *
 * Return value:
 *  - Zero:	pre-processing success.
 *  - Non-zero:	pre-processing error, stop loading.
 */
typedef int (*bpf_program_prep_t)(struct bpf_program *prog, int n,
				  struct bpf_insn *insns, int insns_cnt,
				  struct bpf_prog_prep_result *res);

LIBBPF_API int bpf_program__set_prep(struct bpf_program *prog, int nr_instance,
				     bpf_program_prep_t prep);

LIBBPF_API int bpf_program__nth_fd(struct bpf_program *prog, int n);

/*
 * Adjust type of BPF program. Default is kprobe.
 */
LIBBPF_API int bpf_program__set_socket_filter(struct bpf_program *prog);
LIBBPF_API int bpf_program__set_tracepoint(struct bpf_program *prog);
LIBBPF_API int bpf_program__set_raw_tracepoint(struct bpf_program *prog);
LIBBPF_API int bpf_program__set_kprobe(struct bpf_program *prog);
LIBBPF_API int bpf_program__set_sched_cls(struct bpf_program *prog);
LIBBPF_API int bpf_program__set_sched_act(struct bpf_program *prog);
LIBBPF_API int bpf_program__set_xdp(struct bpf_program *prog);
LIBBPF_API int bpf_program__set_perf_event(struct bpf_program *prog);
LIBBPF_API void bpf_program__set_type(struct bpf_program *prog,
				      enum bpf_prog_type type);
LIBBPF_API void
bpf_program__set_expected_attach_type(struct bpf_program *prog,
				      enum bpf_attach_type type);

LIBBPF_API bool bpf_program__is_socket_filter(struct bpf_program *prog);
LIBBPF_API bool bpf_program__is_tracepoint(struct bpf_program *prog);
LIBBPF_API bool bpf_program__is_raw_tracepoint(struct bpf_program *prog);
LIBBPF_API bool bpf_program__is_kprobe(struct bpf_program *prog);
LIBBPF_API bool bpf_program__is_sched_cls(struct bpf_program *prog);
LIBBPF_API bool bpf_program__is_sched_act(struct bpf_program *prog);
LIBBPF_API bool bpf_program__is_xdp(struct bpf_program *prog);
LIBBPF_API bool bpf_program__is_perf_event(struct bpf_program *prog);

/*
 * No need for __attribute__((packed)), all members of 'bpf_map_def'
 * are all aligned.  In addition, using __attribute__((packed))
 * would trigger a -Wpacked warning message, and lead to an error
 * if -Werror is set.
 */
struct bpf_map_def {
	unsigned int type;
	unsigned int key_size;
	unsigned int value_size;
	unsigned int max_entries;
	unsigned int map_flags;
};

/*
 * The 'struct bpf_map' in include/linux/bpf.h is internal to the kernel,
 * so no need to worry about a name clash.
 */
struct bpf_map;
LIBBPF_API struct bpf_map *
bpf_object__find_map_by_name(struct bpf_object *obj, const char *name);

LIBBPF_API int
bpf_object__find_map_fd_by_name(struct bpf_object *obj, const char *name);

/*
 * Get bpf_map through the offset of corresponding struct bpf_map_def
 * in the BPF object file.
 */
LIBBPF_API struct bpf_map *
bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset);

LIBBPF_API struct bpf_map *
bpf_map__next(struct bpf_map *map, struct bpf_object *obj);
#define bpf_object__for_each_map(pos, obj)		\
	for ((pos) = bpf_map__next(NULL, (obj));	\
	     (pos) != NULL;				\
	     (pos) = bpf_map__next((pos), (obj)))
#define bpf_map__for_each bpf_object__for_each_map

LIBBPF_API struct bpf_map *
bpf_map__prev(struct bpf_map *map, struct bpf_object *obj);

LIBBPF_API int bpf_map__fd(struct bpf_map *map);
LIBBPF_API const struct bpf_map_def *bpf_map__def(struct bpf_map *map);
LIBBPF_API const char *bpf_map__name(struct bpf_map *map);
LIBBPF_API __u32 bpf_map__btf_key_type_id(const struct bpf_map *map);
LIBBPF_API __u32 bpf_map__btf_value_type_id(const struct bpf_map *map);

typedef void (*bpf_map_clear_priv_t)(struct bpf_map *, void *);
LIBBPF_API int bpf_map__set_priv(struct bpf_map *map, void *priv,
				 bpf_map_clear_priv_t clear_priv);
LIBBPF_API void *bpf_map__priv(struct bpf_map *map);
LIBBPF_API int bpf_map__reuse_fd(struct bpf_map *map, int fd);
LIBBPF_API int bpf_map__resize(struct bpf_map *map, __u32 max_entries);
LIBBPF_API bool bpf_map__is_offload_neutral(struct bpf_map *map);
LIBBPF_API bool bpf_map__is_internal(struct bpf_map *map);
LIBBPF_API void bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex);
LIBBPF_API int bpf_map__pin(struct bpf_map *map, const char *path);
LIBBPF_API int bpf_map__unpin(struct bpf_map *map, const char *path);

LIBBPF_API int bpf_map__set_inner_map_fd(struct bpf_map *map, int fd);

LIBBPF_API long libbpf_get_error(const void *ptr);

struct bpf_prog_load_attr {
	const char *file;
	enum bpf_prog_type prog_type;
	enum bpf_attach_type expected_attach_type;
	int ifindex;
	int log_level;
	int prog_flags;
};

LIBBPF_API int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr,
				   struct bpf_object **pobj, int *prog_fd);
LIBBPF_API int bpf_prog_load(const char *file, enum bpf_prog_type type,
			     struct bpf_object **pobj, int *prog_fd);

LIBBPF_API int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags);
LIBBPF_API int bpf_get_link_xdp_id(int ifindex, __u32 *prog_id, __u32 flags);

enum bpf_perf_event_ret {
	LIBBPF_PERF_EVENT_DONE	= 0,
	LIBBPF_PERF_EVENT_ERROR	= -1,
	LIBBPF_PERF_EVENT_CONT	= -2,
};

struct perf_event_header;
typedef enum bpf_perf_event_ret
	(*bpf_perf_event_print_t)(struct perf_event_header *hdr,
				  void *private_data);
LIBBPF_API enum bpf_perf_event_ret
bpf_perf_event_read_simple(void *mmap_mem, size_t mmap_size, size_t page_size,
			   void **copy_mem, size_t *copy_size,
			   bpf_perf_event_print_t fn, void *private_data);

struct nlattr;
typedef int (*libbpf_dump_nlmsg_t)(void *cookie, void *msg, struct nlattr **tb);
int libbpf_netlink_open(unsigned int *nl_pid);
int libbpf_nl_get_link(int sock, unsigned int nl_pid,
		       libbpf_dump_nlmsg_t dump_link_nlmsg, void *cookie);
int libbpf_nl_get_class(int sock, unsigned int nl_pid, int ifindex,
			libbpf_dump_nlmsg_t dump_class_nlmsg, void *cookie);
int libbpf_nl_get_qdisc(int sock, unsigned int nl_pid, int ifindex,
			libbpf_dump_nlmsg_t dump_qdisc_nlmsg, void *cookie);
int libbpf_nl_get_filter(int sock, unsigned int nl_pid, int ifindex, int handle,
			 libbpf_dump_nlmsg_t dump_filter_nlmsg, void *cookie);

struct bpf_prog_linfo;
struct bpf_prog_info;

LIBBPF_API void bpf_prog_linfo__free(struct bpf_prog_linfo *prog_linfo);
LIBBPF_API struct bpf_prog_linfo *
bpf_prog_linfo__new(const struct bpf_prog_info *info);
LIBBPF_API const struct bpf_line_info *
bpf_prog_linfo__lfind_addr_func(const struct bpf_prog_linfo *prog_linfo,
				__u64 addr, __u32 func_idx, __u32 nr_skip);
LIBBPF_API const struct bpf_line_info *
bpf_prog_linfo__lfind(const struct bpf_prog_linfo *prog_linfo,
		      __u32 insn_off, __u32 nr_skip);

/*
 * Probe for supported system features
 *
 * Note that running many of these probes in a short amount of time can cause
 * the kernel to reach the maximal size of lockable memory allowed for the
 * user, causing subsequent probes to fail. In this case, the caller may want
 * to adjust that limit with setrlimit().
 */
LIBBPF_API bool bpf_probe_prog_type(enum bpf_prog_type prog_type,
				    __u32 ifindex);
LIBBPF_API bool bpf_probe_map_type(enum bpf_map_type map_type, __u32 ifindex);
LIBBPF_API bool bpf_probe_helper(enum bpf_func_id id,
				 enum bpf_prog_type prog_type, __u32 ifindex);

/*
 * Get bpf_prog_info in continuous memory
 *
 * struct bpf_prog_info has multiple arrays. The user has option to choose
 * arrays to fetch from kernel. The following APIs provide an uniform way to
 * fetch these data. All arrays in bpf_prog_info are stored in a single
 * continuous memory region. This makes it easy to store the info in a
 * file.
 *
 * Before writing bpf_prog_info_linear to files, it is necessary to
 * translate pointers in bpf_prog_info to offsets. Helper functions
 * bpf_program__bpil_addr_to_offs() and bpf_program__bpil_offs_to_addr()
 * are introduced to switch between pointers and offsets.
 *
 * Examples:
 *   # To fetch map_ids and prog_tags:
 *   __u64 arrays = (1UL << BPF_PROG_INFO_MAP_IDS) |
 *           (1UL << BPF_PROG_INFO_PROG_TAGS);
 *   struct bpf_prog_info_linear *info_linear =
 *           bpf_program__get_prog_info_linear(fd, arrays);
 *
 *   # To save data in file
 *   bpf_program__bpil_addr_to_offs(info_linear);
 *   write(f, info_linear, sizeof(*info_linear) + info_linear->data_len);
 *
 *   # To read data from file
 *   read(f, info_linear, <proper_size>);
 *   bpf_program__bpil_offs_to_addr(info_linear);
 */
enum bpf_prog_info_array {
	BPF_PROG_INFO_FIRST_ARRAY = 0,
	BPF_PROG_INFO_JITED_INSNS = 0,
	BPF_PROG_INFO_XLATED_INSNS,
	BPF_PROG_INFO_MAP_IDS,
	BPF_PROG_INFO_JITED_KSYMS,
	BPF_PROG_INFO_JITED_FUNC_LENS,
	BPF_PROG_INFO_FUNC_INFO,
	BPF_PROG_INFO_LINE_INFO,
	BPF_PROG_INFO_JITED_LINE_INFO,
	BPF_PROG_INFO_PROG_TAGS,
	BPF_PROG_INFO_LAST_ARRAY,
};

struct bpf_prog_info_linear {
	/* size of struct bpf_prog_info, when the tool is compiled */
	__u32			info_len;
	/* total bytes allocated for data, round up to 8 bytes */
	__u32			data_len;
	/* which arrays are included in data */
	__u64			arrays;
	struct bpf_prog_info	info;
	__u8			data[];
};

LIBBPF_API struct bpf_prog_info_linear *
bpf_program__get_prog_info_linear(int fd, __u64 arrays);

LIBBPF_API void
bpf_program__bpil_addr_to_offs(struct bpf_prog_info_linear *info_linear);

LIBBPF_API void
bpf_program__bpil_offs_to_addr(struct bpf_prog_info_linear *info_linear);

#ifdef __cplusplus
} /* extern "C" */
#endif

#endif /* __LIBBPF_LIBBPF_H */
Commit	Line	Data
1bc38b8f	1	/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
6061a3d6	2
1b76c13e WN	3	/*
	4	* Common eBPF ELF object loading operations.
	5	*
	6	* Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org>
	7	* Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
	8	* Copyright (C) 2015 Huawei Inc.
	9	*/
eff81908 AI	10	#ifndef __LIBBPF_LIBBPF_H
eff81908 AI	11	#define __LIBBPF_LIBBPF_H
1b76c13e	12
dfcbc2f2	13	#include <stdarg.h>
1a5e3fb1	14	#include <stdio.h>
e28ff1a8	15	#include <stdint.h>
aa9b1ac3	16	#include <stdbool.h>
5a6acad1	17	#include <sys/types.h> // for size_t
dd26b7f5	18	#include <linux/bpf.h>
6371ca3b	19
8c4905b9 SF	20	#ifdef __cplusplus
	21	extern "C" {
	22	#endif
	23
ab9e0848 AI	24	#ifndef LIBBPF_API
	25	#define LIBBPF_API __attribute__((visibility("default")))
	26	#endif
	27
6371ca3b WN	28	enum libbpf_errno {
	29	__LIBBPF_ERRNO__START = 4000,
	30
	31	/* Something wrong in libelf */
	32	LIBBPF_ERRNO__LIBELF = __LIBBPF_ERRNO__START,
	33	LIBBPF_ERRNO__FORMAT, /* BPF object format invalid */
	34	LIBBPF_ERRNO__KVERSION, /* Incorrect or no 'version' section */
de8a63bd	35	LIBBPF_ERRNO__ENDIAN, /* Endian mismatch */
6371ca3b WN	36	LIBBPF_ERRNO__INTERNAL, /* Internal error in libbpf */
	37	LIBBPF_ERRNO__RELOC, /* Relocation failed */
	38	LIBBPF_ERRNO__LOAD, /* Load program failure for unknown reason */
	39	LIBBPF_ERRNO__VERIFY, /* Kernel verifier blocks program loading */
	40	LIBBPF_ERRNO__PROG2BIG, /* Program too big */
	41	LIBBPF_ERRNO__KVER, /* Incorrect kernel version */
705fa219	42	LIBBPF_ERRNO__PROGTYPE, /* Kernel doesn't support this program type */
949abbe8 EL	43	LIBBPF_ERRNO__WRNGPID, /* Wrong pid in netlink message */
949abbe8 EL	44	LIBBPF_ERRNO__INVSEQ, /* Invalid netlink sequence */
36f1678d	45	LIBBPF_ERRNO__NLPARSE, /* netlink parsing error */
6371ca3b WN	46	__LIBBPF_ERRNO__END,
	47	};
	48
ab9e0848	49	LIBBPF_API int libbpf_strerror(int err, char *buf, size_t size);
1a5e3fb1	50
8461ef8b YS	51	enum libbpf_print_level {
	52	LIBBPF_WARN,
	53	LIBBPF_INFO,
	54	LIBBPF_DEBUG,
	55	};
	56
6f1ae8b6	57	typedef int (*libbpf_print_fn_t)(enum libbpf_print_level level,
a8a1f7d0	58	const char *, va_list ap);
b3f59d66	59
6f1ae8b6	60	LIBBPF_API void libbpf_set_print(libbpf_print_fn_t fn);
b3f59d66	61
1a5e3fb1 WN	62	/* Hide internal to user */
	63	struct bpf_object;
	64
07f2d4ea JK	65	struct bpf_object_open_attr {
	66	const char *file;
	67	enum bpf_prog_type prog_type;
	68	};
	69
ab9e0848 AI	70	LIBBPF_API struct bpf_object bpf_object__open(const char path);
	71	LIBBPF_API struct bpf_object *
	72	bpf_object__open_xattr(struct bpf_object_open_attr *attr);
c034a177 JF	73	struct bpf_object __bpf_object__open_xattr(struct bpf_object_open_attr attr,
c034a177 JF	74	int flags);
ab9e0848 AI	75	LIBBPF_API struct bpf_object bpf_object__open_buffer(void obj_buf,
	76	size_t obj_buf_sz,
	77	const char *name);
1713d68b DB	78	int bpf_object__section_size(const struct bpf_object obj, const char name,
	79	__u32 *size);
	80	int bpf_object__variable_offset(const struct bpf_object obj, const char name,
	81	__u32 *off);
0c19a9fb SF	82	LIBBPF_API int bpf_object__pin_maps(struct bpf_object obj, const char path);
	83	LIBBPF_API int bpf_object__unpin_maps(struct bpf_object *obj,
	84	const char *path);
	85	LIBBPF_API int bpf_object__pin_programs(struct bpf_object *obj,
	86	const char *path);
	87	LIBBPF_API int bpf_object__unpin_programs(struct bpf_object *obj,
	88	const char *path);
ab9e0848 AI	89	LIBBPF_API int bpf_object__pin(struct bpf_object object, const char path);
ab9e0848 AI	90	LIBBPF_API void bpf_object__close(struct bpf_object *object);
1a5e3fb1	91
52d3352e	92	/* Load/unload object into/from kernel */
ab9e0848 AI	93	LIBBPF_API int bpf_object__load(struct bpf_object *obj);
	94	LIBBPF_API int bpf_object__unload(struct bpf_object *obj);
	95	LIBBPF_API const char bpf_object__name(struct bpf_object obj);
	96	LIBBPF_API unsigned int bpf_object__kversion(struct bpf_object *obj);
789f6bab AI	97
	98	struct btf;
	99	LIBBPF_API struct btf bpf_object__btf(struct bpf_object obj);
ab9e0848	100	LIBBPF_API int bpf_object__btf_fd(const struct bpf_object *obj);
52d3352e	101
ab9e0848	102	LIBBPF_API struct bpf_program *
6d4b198b JK	103	bpf_object__find_program_by_title(struct bpf_object obj, const char title);
6d4b198b JK	104
ab9e0848	105	LIBBPF_API struct bpf_object bpf_object__next(struct bpf_object prev);
9a208eff WN	106	#define bpf_object__for_each_safe(pos, tmp) \
	107	for ((pos) = bpf_object__next(NULL), \
	108	(tmp) = bpf_object__next(pos); \
	109	(pos) != NULL; \
	110	(pos) = (tmp), (tmp) = bpf_object__next(tmp))
	111
10931d24	112	typedef void (bpf_object_clear_priv_t)(struct bpf_object , void *);
ab9e0848 AI	113	LIBBPF_API int bpf_object__set_priv(struct bpf_object obj, void priv,
	114	bpf_object_clear_priv_t clear_priv);
	115	LIBBPF_API void bpf_object__priv(struct bpf_object prog);
10931d24	116
ab9e0848 AI	117	LIBBPF_API int
	118	libbpf_prog_type_by_name(const char name, enum bpf_prog_type prog_type,
	119	enum bpf_attach_type *expected_attach_type);
	120	LIBBPF_API int libbpf_attach_type_by_name(const char *name,
	121	enum bpf_attach_type *attach_type);
b60df2a0	122
2eb57bb8	123	/* Accessors of bpf_program */
aa9b1ac3	124	struct bpf_program;
ab9e0848 AI	125	LIBBPF_API struct bpf_program bpf_program__next(struct bpf_program prog,
ab9e0848 AI	126	struct bpf_object *obj);
aa9b1ac3 WN	127
	128	#define bpf_object__for_each_program(pos, obj) \
	129	for ((pos) = bpf_program__next(NULL, (obj)); \
	130	(pos) != NULL; \
	131	(pos) = bpf_program__next((pos), (obj)))
	132
0c19a9fb SF	133	LIBBPF_API struct bpf_program bpf_program__prev(struct bpf_program prog,
	134	struct bpf_object *obj);
	135
aa9b1ac3 WN	136	typedef void (bpf_program_clear_priv_t)(struct bpf_program ,
	137	void *);
	138
ab9e0848 AI	139	LIBBPF_API int bpf_program__set_priv(struct bpf_program prog, void priv,
ab9e0848 AI	140	bpf_program_clear_priv_t clear_priv);
aa9b1ac3	141
ab9e0848 AI	142	LIBBPF_API void bpf_program__priv(struct bpf_program prog);
	143	LIBBPF_API void bpf_program__set_ifindex(struct bpf_program *prog,
	144	__u32 ifindex);
aa9b1ac3	145
ab9e0848 AI	146	LIBBPF_API const char bpf_program__title(struct bpf_program prog,
ab9e0848 AI	147	bool needs_copy);
aa9b1ac3	148
ab9e0848 AI	149	LIBBPF_API int bpf_program__load(struct bpf_program prog, char license,
	150	__u32 kern_version);
	151	LIBBPF_API int bpf_program__fd(struct bpf_program *prog);
	152	LIBBPF_API int bpf_program__pin_instance(struct bpf_program *prog,
	153	const char *path,
	154	int instance);
0c19a9fb SF	155	LIBBPF_API int bpf_program__unpin_instance(struct bpf_program *prog,
	156	const char *path,
	157	int instance);
ab9e0848	158	LIBBPF_API int bpf_program__pin(struct bpf_program prog, const char path);
0c19a9fb	159	LIBBPF_API int bpf_program__unpin(struct bpf_program prog, const char path);
ab9e0848	160	LIBBPF_API void bpf_program__unload(struct bpf_program *prog);
aa9b1ac3	161
b580563e WN	162	struct bpf_insn;
	163
	164	/*
	165	* Libbpf allows callers to adjust BPF programs before being loaded
2eb57bb8 JK	166	* into kernel. One program in an object file can be transformed into
2eb57bb8 JK	167	* multiple variants to be attached to different hooks.
b580563e WN	168	*
b580563e WN	169	* bpf_program_prep_t, bpf_program__set_prep and bpf_program__nth_fd
2eb57bb8	170	* form an API for this purpose.
b580563e WN	171	*
b580563e WN	172	* - bpf_program_prep_t:
2eb57bb8	173	* Defines a 'preprocessor', which is a caller defined function
b580563e WN	174	* passed to libbpf through bpf_program__set_prep(), and will be
b580563e WN	175	* called before program is loaded. The processor should adjust
2eb57bb8	176	* the program one time for each instance according to the instance id
b580563e WN	177	* passed to it.
	178	*
	179	* - bpf_program__set_prep:
2eb57bb8 JK	180	* Attaches a preprocessor to a BPF program. The number of instances
2eb57bb8 JK	181	* that should be created is also passed through this function.
b580563e WN	182	*
b580563e WN	183	* - bpf_program__nth_fd:
2eb57bb8 JK	184	* After the program is loaded, get resulting FD of a given instance
2eb57bb8 JK	185	* of the BPF program.
b580563e	186	*
2eb57bb8	187	* If bpf_program__set_prep() is not used, the program would be loaded
b580563e WN	188	* without adjustment during bpf_object__load(). The program has only
	189	* one instance. In this case bpf_program__fd(prog) is equal to
	190	* bpf_program__nth_fd(prog, 0).
	191	*/
	192
	193	struct bpf_prog_prep_result {
	194	/*
	195	* If not NULL, load new instruction array.
	196	* If set to NULL, don't load this instance.
	197	*/
	198	struct bpf_insn *new_insn_ptr;
	199	int new_insn_cnt;
	200
2eb57bb8	201	/* If not NULL, result FD is written to it. */
b580563e WN	202	int *pfd;
	203	};
	204
	205	/*
	206	* Parameters of bpf_program_prep_t:
	207	* - prog: The bpf_program being loaded.
	208	* - n: Index of instance being generated.
	209	* - insns: BPF instructions array.
	210	* - insns_cnt:Number of instructions in insns.
	211	* - res: Output parameter, result of transformation.
	212	*
	213	* Return value:
2eb57bb8 JK	214	* - Zero: pre-processing success.
2eb57bb8 JK	215	* - Non-zero: pre-processing error, stop loading.
b580563e WN	216	*/
	217	typedef int (bpf_program_prep_t)(struct bpf_program prog, int n,
	218	struct bpf_insn *insns, int insns_cnt,
	219	struct bpf_prog_prep_result *res);
	220
ab9e0848 AI	221	LIBBPF_API int bpf_program__set_prep(struct bpf_program *prog, int nr_instance,
ab9e0848 AI	222	bpf_program_prep_t prep);
b580563e	223
ab9e0848	224	LIBBPF_API int bpf_program__nth_fd(struct bpf_program *prog, int n);
b580563e	225
5f44e4c8	226	/*
2eb57bb8	227	* Adjust type of BPF program. Default is kprobe.
5f44e4c8	228	*/
ab9e0848 AI	229	LIBBPF_API int bpf_program__set_socket_filter(struct bpf_program *prog);
	230	LIBBPF_API int bpf_program__set_tracepoint(struct bpf_program *prog);
	231	LIBBPF_API int bpf_program__set_raw_tracepoint(struct bpf_program *prog);
	232	LIBBPF_API int bpf_program__set_kprobe(struct bpf_program *prog);
	233	LIBBPF_API int bpf_program__set_sched_cls(struct bpf_program *prog);
	234	LIBBPF_API int bpf_program__set_sched_act(struct bpf_program *prog);
	235	LIBBPF_API int bpf_program__set_xdp(struct bpf_program *prog);
	236	LIBBPF_API int bpf_program__set_perf_event(struct bpf_program *prog);
	237	LIBBPF_API void bpf_program__set_type(struct bpf_program *prog,
	238	enum bpf_prog_type type);
	239	LIBBPF_API void
	240	bpf_program__set_expected_attach_type(struct bpf_program *prog,
	241	enum bpf_attach_type type);
	242
	243	LIBBPF_API bool bpf_program__is_socket_filter(struct bpf_program *prog);
	244	LIBBPF_API bool bpf_program__is_tracepoint(struct bpf_program *prog);
	245	LIBBPF_API bool bpf_program__is_raw_tracepoint(struct bpf_program *prog);
	246	LIBBPF_API bool bpf_program__is_kprobe(struct bpf_program *prog);
	247	LIBBPF_API bool bpf_program__is_sched_cls(struct bpf_program *prog);
	248	LIBBPF_API bool bpf_program__is_sched_act(struct bpf_program *prog);
	249	LIBBPF_API bool bpf_program__is_xdp(struct bpf_program *prog);
	250	LIBBPF_API bool bpf_program__is_perf_event(struct bpf_program *prog);
5f44e4c8	251
34090915	252	/*
2eb57bb8 JK	253	* No need for __attribute__((packed)), all members of 'bpf_map_def'
	254	* are all aligned. In addition, using __attribute__((packed))
	255	* would trigger a -Wpacked warning message, and lead to an error
	256	* if -Werror is set.
34090915 WN	257	*/
	258	struct bpf_map_def {
	259	unsigned int type;
	260	unsigned int key_size;
	261	unsigned int value_size;
	262	unsigned int max_entries;
fe9b5f77	263	unsigned int map_flags;
34090915 WN	264	};
34090915 WN	265
9d759a9b	266	/*
2eb57bb8 JK	267	* The 'struct bpf_map' in include/linux/bpf.h is internal to the kernel,
2eb57bb8 JK	268	* so no need to worry about a name clash.
9d759a9b WN	269	*/
9d759a9b WN	270	struct bpf_map;
ab9e0848	271	LIBBPF_API struct bpf_map *
a7fe0450	272	bpf_object__find_map_by_name(struct bpf_object obj, const char name);
9d759a9b	273
f3cea32d MF	274	LIBBPF_API int
	275	bpf_object__find_map_fd_by_name(struct bpf_object obj, const char name);
	276
5a6acad1 WN	277	/*
5a6acad1 WN	278	* Get bpf_map through the offset of corresponding struct bpf_map_def
2eb57bb8	279	* in the BPF object file.
5a6acad1	280	*/
ab9e0848	281	LIBBPF_API struct bpf_map *
5a6acad1 WN	282	bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset);
5a6acad1 WN	283
ab9e0848	284	LIBBPF_API struct bpf_map *
9d759a9b	285	bpf_map__next(struct bpf_map map, struct bpf_object obj);
f74a53d9	286	#define bpf_object__for_each_map(pos, obj) \
9d759a9b WN	287	for ((pos) = bpf_map__next(NULL, (obj)); \
	288	(pos) != NULL; \
	289	(pos) = bpf_map__next((pos), (obj)))
f74a53d9	290	#define bpf_map__for_each bpf_object__for_each_map
9d759a9b	291
0c19a9fb SF	292	LIBBPF_API struct bpf_map *
	293	bpf_map__prev(struct bpf_map map, struct bpf_object obj);
	294
ab9e0848 AI	295	LIBBPF_API int bpf_map__fd(struct bpf_map *map);
	296	LIBBPF_API const struct bpf_map_def bpf_map__def(struct bpf_map map);
	297	LIBBPF_API const char bpf_map__name(struct bpf_map map);
	298	LIBBPF_API __u32 bpf_map__btf_key_type_id(const struct bpf_map *map);
	299	LIBBPF_API __u32 bpf_map__btf_value_type_id(const struct bpf_map *map);
9d759a9b WN	300
9d759a9b WN	301	typedef void (bpf_map_clear_priv_t)(struct bpf_map , void *);
ab9e0848 AI	302	LIBBPF_API int bpf_map__set_priv(struct bpf_map map, void priv,
	303	bpf_map_clear_priv_t clear_priv);
	304	LIBBPF_API void bpf_map__priv(struct bpf_map map);
	305	LIBBPF_API int bpf_map__reuse_fd(struct bpf_map *map, int fd);
1a11a4c7	306	LIBBPF_API int bpf_map__resize(struct bpf_map *map, __u32 max_entries);
ab9e0848	307	LIBBPF_API bool bpf_map__is_offload_neutral(struct bpf_map *map);
d859900c	308	LIBBPF_API bool bpf_map__is_internal(struct bpf_map *map);
ab9e0848 AI	309	LIBBPF_API void bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex);
ab9e0848 AI	310	LIBBPF_API int bpf_map__pin(struct bpf_map map, const char path);
0c19a9fb	311	LIBBPF_API int bpf_map__unpin(struct bpf_map map, const char path);
9d759a9b	312
addb9fc9 NS	313	LIBBPF_API int bpf_map__set_inner_map_fd(struct bpf_map *map, int fd);
addb9fc9 NS	314
ab9e0848	315	LIBBPF_API long libbpf_get_error(const void *ptr);
e28ff1a8	316
d7be143b AI	317	struct bpf_prog_load_attr {
	318	const char *file;
	319	enum bpf_prog_type prog_type;
	320	enum bpf_attach_type expected_attach_type;
f0307a7e	321	int ifindex;
da11b417	322	int log_level;
04656198	323	int prog_flags;
d7be143b AI	324	};
d7be143b AI	325
ab9e0848 AI	326	LIBBPF_API int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr,
	327	struct bpf_object *pobj, int prog_fd);
	328	LIBBPF_API int bpf_prog_load(const char *file, enum bpf_prog_type type,
	329	struct bpf_object *pobj, int prog_fd);
949abbe8	330
ab9e0848	331	LIBBPF_API int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags);
50db9f07	332	LIBBPF_API int bpf_get_link_xdp_id(int ifindex, __u32 *prog_id, __u32 flags);
d0cabbb0 JK	333
	334	enum bpf_perf_event_ret {
	335	LIBBPF_PERF_EVENT_DONE = 0,
	336	LIBBPF_PERF_EVENT_ERROR = -1,
	337	LIBBPF_PERF_EVENT_CONT = -2,
	338	};
	339
3dca2115 DB	340	struct perf_event_header;
	341	typedef enum bpf_perf_event_ret
	342	(bpf_perf_event_print_t)(struct perf_event_header hdr,
	343	void *private_data);
	344	LIBBPF_API enum bpf_perf_event_ret
	345	bpf_perf_event_read_simple(void *mmap_mem, size_t mmap_size, size_t page_size,
	346	void *copy_mem, size_t copy_size,
	347	bpf_perf_event_print_t fn, void *private_data);
36f1678d	348
36f1678d	349	struct nlattr;
aae57780 AI	350	typedef int (libbpf_dump_nlmsg_t)(void cookie, void msg, struct nlattr *tb);
	351	int libbpf_netlink_open(unsigned int *nl_pid);
	352	int libbpf_nl_get_link(int sock, unsigned int nl_pid,
	353	libbpf_dump_nlmsg_t dump_link_nlmsg, void *cookie);
	354	int libbpf_nl_get_class(int sock, unsigned int nl_pid, int ifindex,
	355	libbpf_dump_nlmsg_t dump_class_nlmsg, void *cookie);
	356	int libbpf_nl_get_qdisc(int sock, unsigned int nl_pid, int ifindex,
	357	libbpf_dump_nlmsg_t dump_qdisc_nlmsg, void *cookie);
	358	int libbpf_nl_get_filter(int sock, unsigned int nl_pid, int ifindex, int handle,
	359	libbpf_dump_nlmsg_t dump_filter_nlmsg, void *cookie);
8c4905b9	360
b053b439 MKL	361	struct bpf_prog_linfo;
	362	struct bpf_prog_info;
	363
	364	LIBBPF_API void bpf_prog_linfo__free(struct bpf_prog_linfo *prog_linfo);
	365	LIBBPF_API struct bpf_prog_linfo *
	366	bpf_prog_linfo__new(const struct bpf_prog_info *info);
	367	LIBBPF_API const struct bpf_line_info *
	368	bpf_prog_linfo__lfind_addr_func(const struct bpf_prog_linfo *prog_linfo,
	369	__u64 addr, __u32 func_idx, __u32 nr_skip);
	370	LIBBPF_API const struct bpf_line_info *
	371	bpf_prog_linfo__lfind(const struct bpf_prog_linfo *prog_linfo,
	372	__u32 insn_off, __u32 nr_skip);
	373
1bf4b058 QM	374	/*
	375	* Probe for supported system features
	376	*
	377	* Note that running many of these probes in a short amount of time can cause
	378	* the kernel to reach the maximal size of lockable memory allowed for the
	379	* user, causing subsequent probes to fail. In this case, the caller may want
	380	* to adjust that limit with setrlimit().
	381	*/
	382	LIBBPF_API bool bpf_probe_prog_type(enum bpf_prog_type prog_type,
	383	__u32 ifindex);
f99e1663	384	LIBBPF_API bool bpf_probe_map_type(enum bpf_map_type map_type, __u32 ifindex);
2d3ea5e8 QM	385	LIBBPF_API bool bpf_probe_helper(enum bpf_func_id id,
2d3ea5e8 QM	386	enum bpf_prog_type prog_type, __u32 ifindex);
1bf4b058	387
34be1646 SL	388	/*
	389	* Get bpf_prog_info in continuous memory
	390	*
	391	* struct bpf_prog_info has multiple arrays. The user has option to choose
	392	* arrays to fetch from kernel. The following APIs provide an uniform way to
	393	* fetch these data. All arrays in bpf_prog_info are stored in a single
	394	* continuous memory region. This makes it easy to store the info in a
	395	* file.
	396	*
	397	* Before writing bpf_prog_info_linear to files, it is necessary to
	398	* translate pointers in bpf_prog_info to offsets. Helper functions
	399	* bpf_program__bpil_addr_to_offs() and bpf_program__bpil_offs_to_addr()
	400	* are introduced to switch between pointers and offsets.
	401	*
	402	* Examples:
	403	* # To fetch map_ids and prog_tags:
	404	* __u64 arrays = (1UL << BPF_PROG_INFO_MAP_IDS) \|
	405	* (1UL << BPF_PROG_INFO_PROG_TAGS);
	406	* struct bpf_prog_info_linear *info_linear =
	407	* bpf_program__get_prog_info_linear(fd, arrays);
	408	*
	409	* # To save data in file
	410	* bpf_program__bpil_addr_to_offs(info_linear);
	411	* write(f, info_linear, sizeof(*info_linear) + info_linear->data_len);
	412	*
	413	* # To read data from file
	414	* read(f, info_linear, <proper_size>);
	415	* bpf_program__bpil_offs_to_addr(info_linear);
	416	*/
	417	enum bpf_prog_info_array {
	418	BPF_PROG_INFO_FIRST_ARRAY = 0,
	419	BPF_PROG_INFO_JITED_INSNS = 0,
	420	BPF_PROG_INFO_XLATED_INSNS,
	421	BPF_PROG_INFO_MAP_IDS,
	422	BPF_PROG_INFO_JITED_KSYMS,
	423	BPF_PROG_INFO_JITED_FUNC_LENS,
	424	BPF_PROG_INFO_FUNC_INFO,
	425	BPF_PROG_INFO_LINE_INFO,
	426	BPF_PROG_INFO_JITED_LINE_INFO,
	427	BPF_PROG_INFO_PROG_TAGS,
	428	BPF_PROG_INFO_LAST_ARRAY,
	429	};
	430
	431	struct bpf_prog_info_linear {
	432	/* size of struct bpf_prog_info, when the tool is compiled */
	433	__u32 info_len;
	434	/* total bytes allocated for data, round up to 8 bytes */
	435	__u32 data_len;
	436	/* which arrays are included in data */
	437	__u64 arrays;
	438	struct bpf_prog_info info;
	439	__u8 data[];
	440	};
	441
	442	LIBBPF_API struct bpf_prog_info_linear *
	443	bpf_program__get_prog_info_linear(int fd, __u64 arrays);
	444
	445	LIBBPF_API void
	446	bpf_program__bpil_addr_to_offs(struct bpf_prog_info_linear *info_linear);
	447
	448	LIBBPF_API void
	449	bpf_program__bpil_offs_to_addr(struct bpf_prog_info_linear *info_linear);
	450
8c4905b9 SF	451	#ifdef __cplusplus
	452	} /* extern "C" */
	453	#endif
	454
eff81908	455	#endif /* __LIBBPF_LIBBPF_H */