549 lines
19 KiB
C
549 lines
19 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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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef LIBBPF_API
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#define LIBBPF_API __attribute__((visibility("default")))
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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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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_xattr(struct bpf_object_open_attr *attr);
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struct bpf_object *__bpf_object__open_xattr(struct bpf_object_open_attr *attr,
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int flags);
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LIBBPF_API struct bpf_object *bpf_object__open_buffer(void *obj_buf,
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size_t obj_buf_sz,
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const char *name);
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int bpf_object__section_size(const struct bpf_object *obj, const char *name,
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__u32 *size);
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int bpf_object__variable_offset(const struct bpf_object *obj, const char *name,
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__u32 *off);
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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_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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/* 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__title(const struct bpf_program *prog,
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bool needs_copy);
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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 int bpf_link__destroy(struct bpf_link *link);
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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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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_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 void bpf_program__set_type(struct bpf_program *prog,
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enum bpf_prog_type type);
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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 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_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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/*
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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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struct bpf_map;
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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 *
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bpf_map__next(const struct bpf_map *map, const struct bpf_object *obj);
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#define bpf_object__for_each_map(pos, obj) \
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for ((pos) = bpf_map__next(NULL, (obj)); \
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(pos) != NULL; \
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(pos) = bpf_map__next((pos), (obj)))
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#define bpf_map__for_each bpf_object__for_each_map
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LIBBPF_API struct bpf_map *
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bpf_map__prev(const struct bpf_map *map, const struct bpf_object *obj);
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LIBBPF_API int bpf_map__fd(const struct bpf_map *map);
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LIBBPF_API const struct bpf_map_def *bpf_map__def(const struct bpf_map *map);
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LIBBPF_API const char *bpf_map__name(const struct bpf_map *map);
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LIBBPF_API __u32 bpf_map__btf_key_type_id(const struct bpf_map *map);
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LIBBPF_API __u32 bpf_map__btf_value_type_id(const struct bpf_map *map);
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typedef void (*bpf_map_clear_priv_t)(struct bpf_map *, void *);
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LIBBPF_API int bpf_map__set_priv(struct bpf_map *map, void *priv,
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bpf_map_clear_priv_t clear_priv);
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LIBBPF_API void *bpf_map__priv(const struct bpf_map *map);
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LIBBPF_API int bpf_map__reuse_fd(struct bpf_map *map, int fd);
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LIBBPF_API int bpf_map__resize(struct bpf_map *map, __u32 max_entries);
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LIBBPF_API bool bpf_map__is_offload_neutral(const struct bpf_map *map);
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LIBBPF_API bool bpf_map__is_internal(const struct bpf_map *map);
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LIBBPF_API void bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex);
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LIBBPF_API int bpf_map__pin(struct bpf_map *map, const char *path);
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LIBBPF_API int bpf_map__unpin(struct bpf_map *map, const char *path);
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LIBBPF_API int bpf_map__set_inner_map_fd(struct bpf_map *map, int fd);
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LIBBPF_API long libbpf_get_error(const void *ptr);
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struct bpf_prog_load_attr {
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const char *file;
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enum bpf_prog_type prog_type;
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enum bpf_attach_type expected_attach_type;
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int ifindex;
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int log_level;
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int prog_flags;
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};
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LIBBPF_API int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr,
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struct bpf_object **pobj, int *prog_fd);
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LIBBPF_API int bpf_prog_load(const char *file, enum bpf_prog_type type,
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struct bpf_object **pobj, int *prog_fd);
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LIBBPF_API int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags);
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LIBBPF_API int bpf_get_link_xdp_id(int ifindex, __u32 *prog_id, __u32 flags);
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struct perf_buffer;
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typedef void (*perf_buffer_sample_fn)(void *ctx, int cpu,
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void *data, __u32 size);
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typedef void (*perf_buffer_lost_fn)(void *ctx, int cpu, __u64 cnt);
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/* common use perf buffer options */
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struct perf_buffer_opts {
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/* if specified, sample_cb is called for each sample */
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perf_buffer_sample_fn sample_cb;
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/* if specified, lost_cb is called for each batch of lost samples */
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perf_buffer_lost_fn lost_cb;
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/* ctx is provided to sample_cb and lost_cb */
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void *ctx;
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};
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LIBBPF_API struct perf_buffer *
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perf_buffer__new(int map_fd, size_t page_cnt,
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const struct perf_buffer_opts *opts);
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enum bpf_perf_event_ret {
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LIBBPF_PERF_EVENT_DONE = 0,
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LIBBPF_PERF_EVENT_ERROR = -1,
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LIBBPF_PERF_EVENT_CONT = -2,
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};
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struct perf_event_header;
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typedef enum bpf_perf_event_ret
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(*perf_buffer_event_fn)(void *ctx, int cpu, struct perf_event_header *event);
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/* raw perf buffer options, giving most power and control */
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struct perf_buffer_raw_opts {
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/* perf event attrs passed directly into perf_event_open() */
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struct perf_event_attr *attr;
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/* raw event callback */
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perf_buffer_event_fn event_cb;
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/* ctx is provided to event_cb */
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void *ctx;
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/* if cpu_cnt == 0, open all on all possible CPUs (up to the number of
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* max_entries of given PERF_EVENT_ARRAY map)
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*/
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int cpu_cnt;
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/* if cpu_cnt > 0, cpus is an array of CPUs to open ring buffers on */
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int *cpus;
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/* if cpu_cnt > 0, map_keys specify map keys to set per-CPU FDs for */
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int *map_keys;
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};
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LIBBPF_API struct perf_buffer *
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perf_buffer__new_raw(int map_fd, size_t page_cnt,
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const struct perf_buffer_raw_opts *opts);
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LIBBPF_API void perf_buffer__free(struct perf_buffer *pb);
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LIBBPF_API int perf_buffer__poll(struct perf_buffer *pb, int timeout_ms);
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typedef enum bpf_perf_event_ret
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(*bpf_perf_event_print_t)(struct perf_event_header *hdr,
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void *private_data);
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LIBBPF_API enum bpf_perf_event_ret
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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);
|
|
|
|
/*
|
|
* 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);
|
|
|
|
#ifdef __cplusplus
|
|
} /* extern "C" */
|
|
#endif
|
|
|
|
#endif /* __LIBBPF_LIBBPF_H */
|