758 lines
27 KiB
C
758 lines
27 KiB
C
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
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/*
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* Common eBPF ELF object loading operations.
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*
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* Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org>
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* Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
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* Copyright (C) 2015 Huawei Inc.
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*/
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#ifndef __LIBBPF_LIBBPF_H
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#define __LIBBPF_LIBBPF_H
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <sys/types.h> // for size_t
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#include <linux/bpf.h>
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#include "libbpf_common.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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enum libbpf_errno {
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__LIBBPF_ERRNO__START = 4000,
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/* Something wrong in libelf */
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LIBBPF_ERRNO__LIBELF = __LIBBPF_ERRNO__START,
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LIBBPF_ERRNO__FORMAT, /* BPF object format invalid */
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LIBBPF_ERRNO__KVERSION, /* Incorrect or no 'version' section */
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LIBBPF_ERRNO__ENDIAN, /* Endian mismatch */
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LIBBPF_ERRNO__INTERNAL, /* Internal error in libbpf */
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LIBBPF_ERRNO__RELOC, /* Relocation failed */
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LIBBPF_ERRNO__LOAD, /* Load program failure for unknown reason */
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LIBBPF_ERRNO__VERIFY, /* Kernel verifier blocks program loading */
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LIBBPF_ERRNO__PROG2BIG, /* Program too big */
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LIBBPF_ERRNO__KVER, /* Incorrect kernel version */
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LIBBPF_ERRNO__PROGTYPE, /* Kernel doesn't support this program type */
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LIBBPF_ERRNO__WRNGPID, /* Wrong pid in netlink message */
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LIBBPF_ERRNO__INVSEQ, /* Invalid netlink sequence */
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LIBBPF_ERRNO__NLPARSE, /* netlink parsing error */
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__LIBBPF_ERRNO__END,
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};
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LIBBPF_API int libbpf_strerror(int err, char *buf, size_t size);
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enum libbpf_print_level {
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LIBBPF_WARN,
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LIBBPF_INFO,
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LIBBPF_DEBUG,
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};
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typedef int (*libbpf_print_fn_t)(enum libbpf_print_level level,
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const char *, va_list ap);
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LIBBPF_API libbpf_print_fn_t libbpf_set_print(libbpf_print_fn_t fn);
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/* Hide internal to user */
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struct bpf_object;
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struct bpf_object_open_attr {
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const char *file;
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enum bpf_prog_type prog_type;
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};
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struct bpf_object_open_opts {
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/* size of this struct, for forward/backward compatiblity */
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size_t sz;
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/* object name override, if provided:
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* - for object open from file, this will override setting object
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* name from file path's base name;
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* - for object open from memory buffer, this will specify an object
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* name and will override default "<addr>-<buf-size>" name;
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*/
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const char *object_name;
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/* parse map definitions non-strictly, allowing extra attributes/data */
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bool relaxed_maps;
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/* DEPRECATED: handle CO-RE relocations non-strictly, allowing failures.
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* Value is ignored. Relocations always are processed non-strictly.
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* Non-relocatable instructions are replaced with invalid ones to
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* prevent accidental errors.
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* */
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bool relaxed_core_relocs;
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/* maps that set the 'pinning' attribute in their definition will have
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* their pin_path attribute set to a file in this directory, and be
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* auto-pinned to that path on load; defaults to "/sys/fs/bpf".
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*/
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const char *pin_root_path;
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__u32 attach_prog_fd;
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/* Additional kernel config content that augments and overrides
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* system Kconfig for CONFIG_xxx externs.
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*/
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const char *kconfig;
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};
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#define bpf_object_open_opts__last_field kconfig
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LIBBPF_API struct bpf_object *bpf_object__open(const char *path);
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LIBBPF_API struct bpf_object *
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bpf_object__open_file(const char *path, const struct bpf_object_open_opts *opts);
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LIBBPF_API struct bpf_object *
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bpf_object__open_mem(const void *obj_buf, size_t obj_buf_sz,
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const struct bpf_object_open_opts *opts);
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/* deprecated bpf_object__open variants */
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LIBBPF_API struct bpf_object *
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bpf_object__open_buffer(const void *obj_buf, size_t obj_buf_sz,
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const char *name);
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LIBBPF_API struct bpf_object *
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bpf_object__open_xattr(struct bpf_object_open_attr *attr);
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enum libbpf_pin_type {
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LIBBPF_PIN_NONE,
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/* PIN_BY_NAME: pin maps by name (in /sys/fs/bpf by default) */
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LIBBPF_PIN_BY_NAME,
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};
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/* pin_maps and unpin_maps can both be called with a NULL path, in which case
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* they will use the pin_path attribute of each map (and ignore all maps that
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* don't have a pin_path set).
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*/
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LIBBPF_API int bpf_object__pin_maps(struct bpf_object *obj, const char *path);
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LIBBPF_API int bpf_object__unpin_maps(struct bpf_object *obj,
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const char *path);
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LIBBPF_API int bpf_object__pin_programs(struct bpf_object *obj,
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const char *path);
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LIBBPF_API int bpf_object__unpin_programs(struct bpf_object *obj,
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const char *path);
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LIBBPF_API int bpf_object__pin(struct bpf_object *object, const char *path);
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LIBBPF_API void bpf_object__close(struct bpf_object *object);
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struct bpf_object_load_attr {
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struct bpf_object *obj;
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int log_level;
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const char *target_btf_path;
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};
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/* Load/unload object into/from kernel */
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LIBBPF_API int bpf_object__load(struct bpf_object *obj);
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LIBBPF_API int bpf_object__load_xattr(struct bpf_object_load_attr *attr);
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LIBBPF_API int bpf_object__unload(struct bpf_object *obj);
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LIBBPF_API const char *bpf_object__name(const struct bpf_object *obj);
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LIBBPF_API unsigned int bpf_object__kversion(const struct bpf_object *obj);
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struct btf;
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LIBBPF_API struct btf *bpf_object__btf(const struct bpf_object *obj);
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LIBBPF_API int bpf_object__btf_fd(const struct bpf_object *obj);
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LIBBPF_API struct bpf_program *
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bpf_object__find_program_by_title(const struct bpf_object *obj,
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const char *title);
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LIBBPF_API struct bpf_program *
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bpf_object__find_program_by_name(const struct bpf_object *obj,
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const char *name);
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LIBBPF_API struct bpf_object *bpf_object__next(struct bpf_object *prev);
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#define bpf_object__for_each_safe(pos, tmp) \
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for ((pos) = bpf_object__next(NULL), \
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(tmp) = bpf_object__next(pos); \
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(pos) != NULL; \
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(pos) = (tmp), (tmp) = bpf_object__next(tmp))
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typedef void (*bpf_object_clear_priv_t)(struct bpf_object *, void *);
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LIBBPF_API int bpf_object__set_priv(struct bpf_object *obj, void *priv,
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bpf_object_clear_priv_t clear_priv);
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LIBBPF_API void *bpf_object__priv(const struct bpf_object *prog);
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LIBBPF_API int
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libbpf_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type,
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enum bpf_attach_type *expected_attach_type);
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LIBBPF_API int libbpf_attach_type_by_name(const char *name,
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enum bpf_attach_type *attach_type);
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LIBBPF_API int libbpf_find_vmlinux_btf_id(const char *name,
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enum bpf_attach_type attach_type);
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/* Accessors of bpf_program */
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struct bpf_program;
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LIBBPF_API struct bpf_program *bpf_program__next(struct bpf_program *prog,
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const struct bpf_object *obj);
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#define bpf_object__for_each_program(pos, obj) \
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for ((pos) = bpf_program__next(NULL, (obj)); \
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(pos) != NULL; \
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(pos) = bpf_program__next((pos), (obj)))
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LIBBPF_API struct bpf_program *bpf_program__prev(struct bpf_program *prog,
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const struct bpf_object *obj);
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typedef void (*bpf_program_clear_priv_t)(struct bpf_program *, void *);
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LIBBPF_API int bpf_program__set_priv(struct bpf_program *prog, void *priv,
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bpf_program_clear_priv_t clear_priv);
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LIBBPF_API void *bpf_program__priv(const struct bpf_program *prog);
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LIBBPF_API void bpf_program__set_ifindex(struct bpf_program *prog,
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__u32 ifindex);
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LIBBPF_API const char *bpf_program__name(const struct bpf_program *prog);
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LIBBPF_API const char *bpf_program__title(const struct bpf_program *prog,
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bool needs_copy);
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LIBBPF_API bool bpf_program__autoload(const struct bpf_program *prog);
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LIBBPF_API int bpf_program__set_autoload(struct bpf_program *prog, bool autoload);
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/* returns program size in bytes */
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LIBBPF_API size_t bpf_program__size(const struct bpf_program *prog);
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LIBBPF_API int bpf_program__load(struct bpf_program *prog, char *license,
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__u32 kern_version);
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LIBBPF_API int bpf_program__fd(const struct bpf_program *prog);
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LIBBPF_API int bpf_program__pin_instance(struct bpf_program *prog,
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const char *path,
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int instance);
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LIBBPF_API int bpf_program__unpin_instance(struct bpf_program *prog,
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const char *path,
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int instance);
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LIBBPF_API int bpf_program__pin(struct bpf_program *prog, const char *path);
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LIBBPF_API int bpf_program__unpin(struct bpf_program *prog, const char *path);
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LIBBPF_API void bpf_program__unload(struct bpf_program *prog);
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struct bpf_link;
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LIBBPF_API struct bpf_link *bpf_link__open(const char *path);
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LIBBPF_API int bpf_link__fd(const struct bpf_link *link);
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LIBBPF_API const char *bpf_link__pin_path(const struct bpf_link *link);
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LIBBPF_API int bpf_link__pin(struct bpf_link *link, const char *path);
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LIBBPF_API int bpf_link__unpin(struct bpf_link *link);
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LIBBPF_API int bpf_link__update_program(struct bpf_link *link,
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struct bpf_program *prog);
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LIBBPF_API void bpf_link__disconnect(struct bpf_link *link);
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LIBBPF_API int bpf_link__detach(struct bpf_link *link);
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LIBBPF_API int bpf_link__destroy(struct bpf_link *link);
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LIBBPF_API struct bpf_link *
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bpf_program__attach(struct bpf_program *prog);
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LIBBPF_API struct bpf_link *
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bpf_program__attach_perf_event(struct bpf_program *prog, int pfd);
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LIBBPF_API struct bpf_link *
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bpf_program__attach_kprobe(struct bpf_program *prog, bool retprobe,
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const char *func_name);
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LIBBPF_API struct bpf_link *
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bpf_program__attach_uprobe(struct bpf_program *prog, bool retprobe,
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pid_t pid, const char *binary_path,
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size_t func_offset);
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LIBBPF_API struct bpf_link *
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bpf_program__attach_tracepoint(struct bpf_program *prog,
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const char *tp_category,
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const char *tp_name);
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LIBBPF_API struct bpf_link *
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bpf_program__attach_raw_tracepoint(struct bpf_program *prog,
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const char *tp_name);
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LIBBPF_API struct bpf_link *
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bpf_program__attach_trace(struct bpf_program *prog);
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LIBBPF_API struct bpf_link *
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bpf_program__attach_lsm(struct bpf_program *prog);
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LIBBPF_API struct bpf_link *
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bpf_program__attach_cgroup(struct bpf_program *prog, int cgroup_fd);
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LIBBPF_API struct bpf_link *
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bpf_program__attach_netns(struct bpf_program *prog, int netns_fd);
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LIBBPF_API struct bpf_link *
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bpf_program__attach_xdp(struct bpf_program *prog, int ifindex);
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struct bpf_map;
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LIBBPF_API struct bpf_link *bpf_map__attach_struct_ops(struct bpf_map *map);
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struct bpf_iter_attach_opts {
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size_t sz; /* size of this struct for forward/backward compatibility */
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union bpf_iter_link_info *link_info;
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__u32 link_info_len;
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};
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#define bpf_iter_attach_opts__last_field link_info_len
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LIBBPF_API struct bpf_link *
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bpf_program__attach_iter(struct bpf_program *prog,
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const struct bpf_iter_attach_opts *opts);
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struct bpf_insn;
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/*
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* Libbpf allows callers to adjust BPF programs before being loaded
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* into kernel. One program in an object file can be transformed into
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* multiple variants to be attached to different hooks.
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*
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* bpf_program_prep_t, bpf_program__set_prep and bpf_program__nth_fd
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* form an API for this purpose.
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*
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* - bpf_program_prep_t:
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* Defines a 'preprocessor', which is a caller defined function
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* passed to libbpf through bpf_program__set_prep(), and will be
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* called before program is loaded. The processor should adjust
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* the program one time for each instance according to the instance id
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* passed to it.
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*
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* - bpf_program__set_prep:
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* Attaches a preprocessor to a BPF program. The number of instances
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* that should be created is also passed through this function.
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*
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* - bpf_program__nth_fd:
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* After the program is loaded, get resulting FD of a given instance
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* of the BPF program.
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*
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* If bpf_program__set_prep() is not used, the program would be loaded
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* without adjustment during bpf_object__load(). The program has only
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* one instance. In this case bpf_program__fd(prog) is equal to
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* bpf_program__nth_fd(prog, 0).
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*/
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struct bpf_prog_prep_result {
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/*
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* If not NULL, load new instruction array.
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* If set to NULL, don't load this instance.
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*/
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struct bpf_insn *new_insn_ptr;
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int new_insn_cnt;
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/* If not NULL, result FD is written to it. */
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int *pfd;
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};
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/*
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* Parameters of bpf_program_prep_t:
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* - prog: The bpf_program being loaded.
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* - n: Index of instance being generated.
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* - insns: BPF instructions array.
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* - insns_cnt:Number of instructions in insns.
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* - res: Output parameter, result of transformation.
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*
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* Return value:
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* - Zero: pre-processing success.
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* - Non-zero: pre-processing error, stop loading.
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*/
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typedef int (*bpf_program_prep_t)(struct bpf_program *prog, int n,
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struct bpf_insn *insns, int insns_cnt,
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struct bpf_prog_prep_result *res);
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LIBBPF_API int bpf_program__set_prep(struct bpf_program *prog, int nr_instance,
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bpf_program_prep_t prep);
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LIBBPF_API int bpf_program__nth_fd(const struct bpf_program *prog, int n);
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/*
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* Adjust type of BPF program. Default is kprobe.
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*/
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LIBBPF_API int bpf_program__set_socket_filter(struct bpf_program *prog);
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LIBBPF_API int bpf_program__set_tracepoint(struct bpf_program *prog);
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LIBBPF_API int bpf_program__set_raw_tracepoint(struct bpf_program *prog);
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LIBBPF_API int bpf_program__set_kprobe(struct bpf_program *prog);
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LIBBPF_API int bpf_program__set_lsm(struct bpf_program *prog);
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LIBBPF_API int bpf_program__set_sched_cls(struct bpf_program *prog);
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LIBBPF_API int bpf_program__set_sched_act(struct bpf_program *prog);
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LIBBPF_API int bpf_program__set_xdp(struct bpf_program *prog);
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LIBBPF_API int bpf_program__set_perf_event(struct bpf_program *prog);
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LIBBPF_API int bpf_program__set_tracing(struct bpf_program *prog);
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LIBBPF_API int bpf_program__set_struct_ops(struct bpf_program *prog);
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LIBBPF_API int bpf_program__set_extension(struct bpf_program *prog);
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LIBBPF_API int bpf_program__set_sk_lookup(struct bpf_program *prog);
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LIBBPF_API enum bpf_prog_type bpf_program__get_type(struct bpf_program *prog);
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LIBBPF_API void bpf_program__set_type(struct bpf_program *prog,
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enum bpf_prog_type type);
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LIBBPF_API enum bpf_attach_type
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bpf_program__get_expected_attach_type(struct bpf_program *prog);
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LIBBPF_API void
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bpf_program__set_expected_attach_type(struct bpf_program *prog,
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enum bpf_attach_type type);
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LIBBPF_API int
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bpf_program__set_attach_target(struct bpf_program *prog, int attach_prog_fd,
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const char *attach_func_name);
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LIBBPF_API bool bpf_program__is_socket_filter(const struct bpf_program *prog);
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LIBBPF_API bool bpf_program__is_tracepoint(const struct bpf_program *prog);
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LIBBPF_API bool bpf_program__is_raw_tracepoint(const struct bpf_program *prog);
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LIBBPF_API bool bpf_program__is_kprobe(const struct bpf_program *prog);
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LIBBPF_API bool bpf_program__is_lsm(const struct bpf_program *prog);
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LIBBPF_API bool bpf_program__is_sched_cls(const struct bpf_program *prog);
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LIBBPF_API bool bpf_program__is_sched_act(const struct bpf_program *prog);
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LIBBPF_API bool bpf_program__is_xdp(const struct bpf_program *prog);
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LIBBPF_API bool bpf_program__is_perf_event(const struct bpf_program *prog);
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LIBBPF_API bool bpf_program__is_tracing(const struct bpf_program *prog);
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LIBBPF_API bool bpf_program__is_struct_ops(const struct bpf_program *prog);
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LIBBPF_API bool bpf_program__is_extension(const struct bpf_program *prog);
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LIBBPF_API bool bpf_program__is_sk_lookup(const struct bpf_program *prog);
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/*
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* No need for __attribute__((packed)), all members of 'bpf_map_def'
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* are all aligned. In addition, using __attribute__((packed))
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* would trigger a -Wpacked warning message, and lead to an error
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* if -Werror is set.
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*/
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struct bpf_map_def {
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unsigned int type;
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unsigned int key_size;
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unsigned int value_size;
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unsigned int max_entries;
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unsigned int map_flags;
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};
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/*
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* The 'struct bpf_map' in include/linux/bpf.h is internal to the kernel,
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* so no need to worry about a name clash.
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*/
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LIBBPF_API struct bpf_map *
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bpf_object__find_map_by_name(const struct bpf_object *obj, const char *name);
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LIBBPF_API int
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bpf_object__find_map_fd_by_name(const struct bpf_object *obj, const char *name);
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/*
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* Get bpf_map through the offset of corresponding struct bpf_map_def
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* in the BPF object file.
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*/
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LIBBPF_API struct bpf_map *
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bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset);
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LIBBPF_API struct bpf_map *
|
|
bpf_map__next(const struct bpf_map *map, const 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(const struct bpf_map *map, const struct bpf_object *obj);
|
|
|
|
/* get/set map FD */
|
|
LIBBPF_API int bpf_map__fd(const struct bpf_map *map);
|
|
LIBBPF_API int bpf_map__reuse_fd(struct bpf_map *map, int fd);
|
|
/* get map definition */
|
|
LIBBPF_API const struct bpf_map_def *bpf_map__def(const struct bpf_map *map);
|
|
/* get map name */
|
|
LIBBPF_API const char *bpf_map__name(const struct bpf_map *map);
|
|
/* get/set map type */
|
|
LIBBPF_API enum bpf_map_type bpf_map__type(const struct bpf_map *map);
|
|
LIBBPF_API int bpf_map__set_type(struct bpf_map *map, enum bpf_map_type type);
|
|
/* get/set map size (max_entries) */
|
|
LIBBPF_API __u32 bpf_map__max_entries(const struct bpf_map *map);
|
|
LIBBPF_API int bpf_map__set_max_entries(struct bpf_map *map, __u32 max_entries);
|
|
LIBBPF_API int bpf_map__resize(struct bpf_map *map, __u32 max_entries);
|
|
/* get/set map flags */
|
|
LIBBPF_API __u32 bpf_map__map_flags(const struct bpf_map *map);
|
|
LIBBPF_API int bpf_map__set_map_flags(struct bpf_map *map, __u32 flags);
|
|
/* get/set map NUMA node */
|
|
LIBBPF_API __u32 bpf_map__numa_node(const struct bpf_map *map);
|
|
LIBBPF_API int bpf_map__set_numa_node(struct bpf_map *map, __u32 numa_node);
|
|
/* get/set map key size */
|
|
LIBBPF_API __u32 bpf_map__key_size(const struct bpf_map *map);
|
|
LIBBPF_API int bpf_map__set_key_size(struct bpf_map *map, __u32 size);
|
|
/* get/set map value size */
|
|
LIBBPF_API __u32 bpf_map__value_size(const struct bpf_map *map);
|
|
LIBBPF_API int bpf_map__set_value_size(struct bpf_map *map, __u32 size);
|
|
/* get map key/value BTF type IDs */
|
|
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);
|
|
/* get/set map if_index */
|
|
LIBBPF_API __u32 bpf_map__ifindex(const struct bpf_map *map);
|
|
LIBBPF_API int bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex);
|
|
|
|
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(const struct bpf_map *map);
|
|
LIBBPF_API int bpf_map__set_initial_value(struct bpf_map *map,
|
|
const void *data, size_t size);
|
|
LIBBPF_API bool bpf_map__is_offload_neutral(const struct bpf_map *map);
|
|
LIBBPF_API bool bpf_map__is_internal(const struct bpf_map *map);
|
|
LIBBPF_API int bpf_map__set_pin_path(struct bpf_map *map, const char *path);
|
|
LIBBPF_API const char *bpf_map__get_pin_path(const struct bpf_map *map);
|
|
LIBBPF_API bool bpf_map__is_pinned(const struct bpf_map *map);
|
|
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);
|
|
|
|
struct xdp_link_info {
|
|
__u32 prog_id;
|
|
__u32 drv_prog_id;
|
|
__u32 hw_prog_id;
|
|
__u32 skb_prog_id;
|
|
__u8 attach_mode;
|
|
};
|
|
|
|
struct bpf_xdp_set_link_opts {
|
|
size_t sz;
|
|
int old_fd;
|
|
};
|
|
#define bpf_xdp_set_link_opts__last_field old_fd
|
|
|
|
LIBBPF_API int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags);
|
|
LIBBPF_API int bpf_set_link_xdp_fd_opts(int ifindex, int fd, __u32 flags,
|
|
const struct bpf_xdp_set_link_opts *opts);
|
|
LIBBPF_API int bpf_get_link_xdp_id(int ifindex, __u32 *prog_id, __u32 flags);
|
|
LIBBPF_API int bpf_get_link_xdp_info(int ifindex, struct xdp_link_info *info,
|
|
size_t info_size, __u32 flags);
|
|
|
|
/* Ring buffer APIs */
|
|
struct ring_buffer;
|
|
|
|
typedef int (*ring_buffer_sample_fn)(void *ctx, void *data, size_t size);
|
|
|
|
struct ring_buffer_opts {
|
|
size_t sz; /* size of this struct, for forward/backward compatiblity */
|
|
};
|
|
|
|
#define ring_buffer_opts__last_field sz
|
|
|
|
LIBBPF_API struct ring_buffer *
|
|
ring_buffer__new(int map_fd, ring_buffer_sample_fn sample_cb, void *ctx,
|
|
const struct ring_buffer_opts *opts);
|
|
LIBBPF_API void ring_buffer__free(struct ring_buffer *rb);
|
|
LIBBPF_API int ring_buffer__add(struct ring_buffer *rb, int map_fd,
|
|
ring_buffer_sample_fn sample_cb, void *ctx);
|
|
LIBBPF_API int ring_buffer__poll(struct ring_buffer *rb, int timeout_ms);
|
|
LIBBPF_API int ring_buffer__consume(struct ring_buffer *rb);
|
|
|
|
/* Perf buffer APIs */
|
|
struct perf_buffer;
|
|
|
|
typedef void (*perf_buffer_sample_fn)(void *ctx, int cpu,
|
|
void *data, __u32 size);
|
|
typedef void (*perf_buffer_lost_fn)(void *ctx, int cpu, __u64 cnt);
|
|
|
|
/* common use perf buffer options */
|
|
struct perf_buffer_opts {
|
|
/* if specified, sample_cb is called for each sample */
|
|
perf_buffer_sample_fn sample_cb;
|
|
/* if specified, lost_cb is called for each batch of lost samples */
|
|
perf_buffer_lost_fn lost_cb;
|
|
/* ctx is provided to sample_cb and lost_cb */
|
|
void *ctx;
|
|
};
|
|
|
|
LIBBPF_API struct perf_buffer *
|
|
perf_buffer__new(int map_fd, size_t page_cnt,
|
|
const struct perf_buffer_opts *opts);
|
|
|
|
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
|
|
(*perf_buffer_event_fn)(void *ctx, int cpu, struct perf_event_header *event);
|
|
|
|
/* raw perf buffer options, giving most power and control */
|
|
struct perf_buffer_raw_opts {
|
|
/* perf event attrs passed directly into perf_event_open() */
|
|
struct perf_event_attr *attr;
|
|
/* raw event callback */
|
|
perf_buffer_event_fn event_cb;
|
|
/* ctx is provided to event_cb */
|
|
void *ctx;
|
|
/* if cpu_cnt == 0, open all on all possible CPUs (up to the number of
|
|
* max_entries of given PERF_EVENT_ARRAY map)
|
|
*/
|
|
int cpu_cnt;
|
|
/* if cpu_cnt > 0, cpus is an array of CPUs to open ring buffers on */
|
|
int *cpus;
|
|
/* if cpu_cnt > 0, map_keys specify map keys to set per-CPU FDs for */
|
|
int *map_keys;
|
|
};
|
|
|
|
LIBBPF_API struct perf_buffer *
|
|
perf_buffer__new_raw(int map_fd, size_t page_cnt,
|
|
const struct perf_buffer_raw_opts *opts);
|
|
|
|
LIBBPF_API void perf_buffer__free(struct perf_buffer *pb);
|
|
LIBBPF_API int perf_buffer__poll(struct perf_buffer *pb, int timeout_ms);
|
|
LIBBPF_API int perf_buffer__consume(struct perf_buffer *pb);
|
|
|
|
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 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);
|
|
LIBBPF_API bool bpf_probe_large_insn_limit(__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);
|
|
|
|
/*
|
|
* A helper function to get the number of possible CPUs before looking up
|
|
* per-CPU maps. Negative errno is returned on failure.
|
|
*
|
|
* Example usage:
|
|
*
|
|
* int ncpus = libbpf_num_possible_cpus();
|
|
* if (ncpus < 0) {
|
|
* // error handling
|
|
* }
|
|
* long values[ncpus];
|
|
* bpf_map_lookup_elem(per_cpu_map_fd, key, values);
|
|
*
|
|
*/
|
|
LIBBPF_API int libbpf_num_possible_cpus(void);
|
|
|
|
struct bpf_map_skeleton {
|
|
const char *name;
|
|
struct bpf_map **map;
|
|
void **mmaped;
|
|
};
|
|
|
|
struct bpf_prog_skeleton {
|
|
const char *name;
|
|
struct bpf_program **prog;
|
|
struct bpf_link **link;
|
|
};
|
|
|
|
struct bpf_object_skeleton {
|
|
size_t sz; /* size of this struct, for forward/backward compatibility */
|
|
|
|
const char *name;
|
|
void *data;
|
|
size_t data_sz;
|
|
|
|
struct bpf_object **obj;
|
|
|
|
int map_cnt;
|
|
int map_skel_sz; /* sizeof(struct bpf_skeleton_map) */
|
|
struct bpf_map_skeleton *maps;
|
|
|
|
int prog_cnt;
|
|
int prog_skel_sz; /* sizeof(struct bpf_skeleton_prog) */
|
|
struct bpf_prog_skeleton *progs;
|
|
};
|
|
|
|
LIBBPF_API int
|
|
bpf_object__open_skeleton(struct bpf_object_skeleton *s,
|
|
const struct bpf_object_open_opts *opts);
|
|
LIBBPF_API int bpf_object__load_skeleton(struct bpf_object_skeleton *s);
|
|
LIBBPF_API int bpf_object__attach_skeleton(struct bpf_object_skeleton *s);
|
|
LIBBPF_API void bpf_object__detach_skeleton(struct bpf_object_skeleton *s);
|
|
LIBBPF_API void bpf_object__destroy_skeleton(struct bpf_object_skeleton *s);
|
|
|
|
enum libbpf_tristate {
|
|
TRI_NO = 0,
|
|
TRI_YES = 1,
|
|
TRI_MODULE = 2,
|
|
};
|
|
|
|
#ifdef __cplusplus
|
|
} /* extern "C" */
|
|
#endif
|
|
|
|
#endif /* __LIBBPF_LIBBPF_H */
|