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![Andrii Nakryiko](/assets/img/avatar_default.png)
Drop the requirement for system-wide kernel UAPI headers to provide full
struct btf_enum64 definition. This is an unexpected requirement that
slipped in libbpf 1.0 and put unnecessary pressure ([0]) on users to have
a bleeding-edge kernel UAPI header from unreleased Linux 6.0.
To achieve this, we forward declare struct btf_enum64. But that's not
enough as there is btf_enum64_value() helper that expects to know the
layout of struct btf_enum64. So we get a bit creative with
reinterpreting memory layout as array of __u32 and accesing lo32/hi32
fields as array elements. Alternative way would be to have a local
pointer variable for anonymous struct with exactly the same layout as
struct btf_enum64, but that gets us into C++ compiler errors complaining
about invalid type casts. So play it safe, if ugly.
[0] Closes: https://github.com/libbpf/libbpf/issues/562
Fixes: d90ec262b3
("libbpf: Add enum64 support for btf_dump")
Reported-by: Toke Høiland-Jørgensen <toke@toke.dk>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Toke Høiland-Jørgensen <toke@toke.dk>
Link: https://lore.kernel.org/bpf/20220927042940.147185-1-andrii@kernel.org
575 lines
18 KiB
C
575 lines
18 KiB
C
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
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/* Copyright (c) 2018 Facebook */
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/*! \file */
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#ifndef __LIBBPF_BTF_H
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#define __LIBBPF_BTF_H
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#include <stdarg.h>
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#include <stdbool.h>
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#include <linux/btf.h>
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#include <linux/types.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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#define BTF_ELF_SEC ".BTF"
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#define BTF_EXT_ELF_SEC ".BTF.ext"
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#define MAPS_ELF_SEC ".maps"
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struct btf;
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struct btf_ext;
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struct btf_type;
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struct bpf_object;
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enum btf_endianness {
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BTF_LITTLE_ENDIAN = 0,
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BTF_BIG_ENDIAN = 1,
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};
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/**
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* @brief **btf__free()** frees all data of a BTF object
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* @param btf BTF object to free
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*/
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LIBBPF_API void btf__free(struct btf *btf);
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/**
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* @brief **btf__new()** creates a new instance of a BTF object from the raw
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* bytes of an ELF's BTF section
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* @param data raw bytes
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* @param size number of bytes passed in `data`
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* @return new BTF object instance which has to be eventually freed with
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* **btf__free()**
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*
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* On error, error-code-encoded-as-pointer is returned, not a NULL. To extract
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* error code from such a pointer `libbpf_get_error()` should be used. If
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* `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)` is enabled, NULL is
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* returned on error instead. In both cases thread-local `errno` variable is
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* always set to error code as well.
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*/
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LIBBPF_API struct btf *btf__new(const void *data, __u32 size);
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/**
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* @brief **btf__new_split()** create a new instance of a BTF object from the
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* provided raw data bytes. It takes another BTF instance, **base_btf**, which
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* serves as a base BTF, which is extended by types in a newly created BTF
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* instance
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* @param data raw bytes
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* @param size length of raw bytes
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* @param base_btf the base BTF object
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* @return new BTF object instance which has to be eventually freed with
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* **btf__free()**
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*
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* If *base_btf* is NULL, `btf__new_split()` is equivalent to `btf__new()` and
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* creates non-split BTF.
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*
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* On error, error-code-encoded-as-pointer is returned, not a NULL. To extract
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* error code from such a pointer `libbpf_get_error()` should be used. If
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* `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)` is enabled, NULL is
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* returned on error instead. In both cases thread-local `errno` variable is
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* always set to error code as well.
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*/
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LIBBPF_API struct btf *btf__new_split(const void *data, __u32 size, struct btf *base_btf);
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/**
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* @brief **btf__new_empty()** creates an empty BTF object. Use
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* `btf__add_*()` to populate such BTF object.
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* @return new BTF object instance which has to be eventually freed with
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* **btf__free()**
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*
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* On error, error-code-encoded-as-pointer is returned, not a NULL. To extract
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* error code from such a pointer `libbpf_get_error()` should be used. If
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* `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)` is enabled, NULL is
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* returned on error instead. In both cases thread-local `errno` variable is
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* always set to error code as well.
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*/
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LIBBPF_API struct btf *btf__new_empty(void);
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/**
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* @brief **btf__new_empty_split()** creates an unpopulated BTF object from an
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* ELF BTF section except with a base BTF on top of which split BTF should be
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* based
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* @return new BTF object instance which has to be eventually freed with
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* **btf__free()**
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*
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* If *base_btf* is NULL, `btf__new_empty_split()` is equivalent to
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* `btf__new_empty()` and creates non-split BTF.
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*
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* On error, error-code-encoded-as-pointer is returned, not a NULL. To extract
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* error code from such a pointer `libbpf_get_error()` should be used. If
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* `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)` is enabled, NULL is
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* returned on error instead. In both cases thread-local `errno` variable is
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* always set to error code as well.
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*/
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LIBBPF_API struct btf *btf__new_empty_split(struct btf *base_btf);
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LIBBPF_API struct btf *btf__parse(const char *path, struct btf_ext **btf_ext);
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LIBBPF_API struct btf *btf__parse_split(const char *path, struct btf *base_btf);
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LIBBPF_API struct btf *btf__parse_elf(const char *path, struct btf_ext **btf_ext);
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LIBBPF_API struct btf *btf__parse_elf_split(const char *path, struct btf *base_btf);
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LIBBPF_API struct btf *btf__parse_raw(const char *path);
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LIBBPF_API struct btf *btf__parse_raw_split(const char *path, struct btf *base_btf);
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LIBBPF_API struct btf *btf__load_vmlinux_btf(void);
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LIBBPF_API struct btf *btf__load_module_btf(const char *module_name, struct btf *vmlinux_btf);
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LIBBPF_API struct btf *btf__load_from_kernel_by_id(__u32 id);
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LIBBPF_API struct btf *btf__load_from_kernel_by_id_split(__u32 id, struct btf *base_btf);
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LIBBPF_API int btf__load_into_kernel(struct btf *btf);
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LIBBPF_API __s32 btf__find_by_name(const struct btf *btf,
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const char *type_name);
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LIBBPF_API __s32 btf__find_by_name_kind(const struct btf *btf,
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const char *type_name, __u32 kind);
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LIBBPF_API __u32 btf__type_cnt(const struct btf *btf);
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LIBBPF_API const struct btf *btf__base_btf(const struct btf *btf);
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LIBBPF_API const struct btf_type *btf__type_by_id(const struct btf *btf,
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__u32 id);
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LIBBPF_API size_t btf__pointer_size(const struct btf *btf);
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LIBBPF_API int btf__set_pointer_size(struct btf *btf, size_t ptr_sz);
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LIBBPF_API enum btf_endianness btf__endianness(const struct btf *btf);
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LIBBPF_API int btf__set_endianness(struct btf *btf, enum btf_endianness endian);
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LIBBPF_API __s64 btf__resolve_size(const struct btf *btf, __u32 type_id);
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LIBBPF_API int btf__resolve_type(const struct btf *btf, __u32 type_id);
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LIBBPF_API int btf__align_of(const struct btf *btf, __u32 id);
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LIBBPF_API int btf__fd(const struct btf *btf);
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LIBBPF_API void btf__set_fd(struct btf *btf, int fd);
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LIBBPF_API const void *btf__raw_data(const struct btf *btf, __u32 *size);
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LIBBPF_API const char *btf__name_by_offset(const struct btf *btf, __u32 offset);
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LIBBPF_API const char *btf__str_by_offset(const struct btf *btf, __u32 offset);
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LIBBPF_API struct btf_ext *btf_ext__new(const __u8 *data, __u32 size);
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LIBBPF_API void btf_ext__free(struct btf_ext *btf_ext);
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LIBBPF_API const void *btf_ext__raw_data(const struct btf_ext *btf_ext, __u32 *size);
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LIBBPF_API int btf__find_str(struct btf *btf, const char *s);
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LIBBPF_API int btf__add_str(struct btf *btf, const char *s);
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LIBBPF_API int btf__add_type(struct btf *btf, const struct btf *src_btf,
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const struct btf_type *src_type);
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/**
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* @brief **btf__add_btf()** appends all the BTF types from *src_btf* into *btf*
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* @param btf BTF object which all the BTF types and strings are added to
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* @param src_btf BTF object which all BTF types and referenced strings are copied from
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* @return BTF type ID of the first appended BTF type, or negative error code
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*
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* **btf__add_btf()** can be used to simply and efficiently append the entire
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* contents of one BTF object to another one. All the BTF type data is copied
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* over, all referenced type IDs are adjusted by adding a necessary ID offset.
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* Only strings referenced from BTF types are copied over and deduplicated, so
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* if there were some unused strings in *src_btf*, those won't be copied over,
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* which is consistent with the general string deduplication semantics of BTF
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* writing APIs.
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*
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* If any error is encountered during this process, the contents of *btf* is
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* left intact, which means that **btf__add_btf()** follows the transactional
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* semantics and the operation as a whole is all-or-nothing.
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*
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* *src_btf* has to be non-split BTF, as of now copying types from split BTF
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* is not supported and will result in -ENOTSUP error code returned.
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*/
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LIBBPF_API int btf__add_btf(struct btf *btf, const struct btf *src_btf);
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LIBBPF_API int btf__add_int(struct btf *btf, const char *name, size_t byte_sz, int encoding);
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LIBBPF_API int btf__add_float(struct btf *btf, const char *name, size_t byte_sz);
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LIBBPF_API int btf__add_ptr(struct btf *btf, int ref_type_id);
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LIBBPF_API int btf__add_array(struct btf *btf,
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int index_type_id, int elem_type_id, __u32 nr_elems);
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/* struct/union construction APIs */
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LIBBPF_API int btf__add_struct(struct btf *btf, const char *name, __u32 sz);
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LIBBPF_API int btf__add_union(struct btf *btf, const char *name, __u32 sz);
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LIBBPF_API int btf__add_field(struct btf *btf, const char *name, int field_type_id,
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__u32 bit_offset, __u32 bit_size);
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/* enum construction APIs */
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LIBBPF_API int btf__add_enum(struct btf *btf, const char *name, __u32 bytes_sz);
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LIBBPF_API int btf__add_enum_value(struct btf *btf, const char *name, __s64 value);
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LIBBPF_API int btf__add_enum64(struct btf *btf, const char *name, __u32 bytes_sz, bool is_signed);
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LIBBPF_API int btf__add_enum64_value(struct btf *btf, const char *name, __u64 value);
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enum btf_fwd_kind {
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BTF_FWD_STRUCT = 0,
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BTF_FWD_UNION = 1,
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BTF_FWD_ENUM = 2,
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};
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LIBBPF_API int btf__add_fwd(struct btf *btf, const char *name, enum btf_fwd_kind fwd_kind);
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LIBBPF_API int btf__add_typedef(struct btf *btf, const char *name, int ref_type_id);
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LIBBPF_API int btf__add_volatile(struct btf *btf, int ref_type_id);
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LIBBPF_API int btf__add_const(struct btf *btf, int ref_type_id);
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LIBBPF_API int btf__add_restrict(struct btf *btf, int ref_type_id);
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LIBBPF_API int btf__add_type_tag(struct btf *btf, const char *value, int ref_type_id);
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/* func and func_proto construction APIs */
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LIBBPF_API int btf__add_func(struct btf *btf, const char *name,
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enum btf_func_linkage linkage, int proto_type_id);
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LIBBPF_API int btf__add_func_proto(struct btf *btf, int ret_type_id);
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LIBBPF_API int btf__add_func_param(struct btf *btf, const char *name, int type_id);
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/* var & datasec construction APIs */
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LIBBPF_API int btf__add_var(struct btf *btf, const char *name, int linkage, int type_id);
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LIBBPF_API int btf__add_datasec(struct btf *btf, const char *name, __u32 byte_sz);
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LIBBPF_API int btf__add_datasec_var_info(struct btf *btf, int var_type_id,
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__u32 offset, __u32 byte_sz);
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/* tag construction API */
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LIBBPF_API int btf__add_decl_tag(struct btf *btf, const char *value, int ref_type_id,
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int component_idx);
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struct btf_dedup_opts {
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size_t sz;
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/* optional .BTF.ext info to dedup along the main BTF info */
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struct btf_ext *btf_ext;
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/* force hash collisions (used for testing) */
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bool force_collisions;
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size_t :0;
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};
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#define btf_dedup_opts__last_field force_collisions
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LIBBPF_API int btf__dedup(struct btf *btf, const struct btf_dedup_opts *opts);
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struct btf_dump;
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struct btf_dump_opts {
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size_t sz;
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};
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#define btf_dump_opts__last_field sz
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typedef void (*btf_dump_printf_fn_t)(void *ctx, const char *fmt, va_list args);
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LIBBPF_API struct btf_dump *btf_dump__new(const struct btf *btf,
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btf_dump_printf_fn_t printf_fn,
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void *ctx,
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const struct btf_dump_opts *opts);
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LIBBPF_API void btf_dump__free(struct btf_dump *d);
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LIBBPF_API int btf_dump__dump_type(struct btf_dump *d, __u32 id);
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struct btf_dump_emit_type_decl_opts {
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/* size of this struct, for forward/backward compatiblity */
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size_t sz;
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/* optional field name for type declaration, e.g.:
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* - struct my_struct <FNAME>
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* - void (*<FNAME>)(int)
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* - char (*<FNAME>)[123]
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*/
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const char *field_name;
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/* extra indentation level (in number of tabs) to emit for multi-line
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* type declarations (e.g., anonymous struct); applies for lines
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* starting from the second one (first line is assumed to have
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* necessary indentation already
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*/
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int indent_level;
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/* strip all the const/volatile/restrict mods */
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bool strip_mods;
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size_t :0;
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};
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#define btf_dump_emit_type_decl_opts__last_field strip_mods
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LIBBPF_API int
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btf_dump__emit_type_decl(struct btf_dump *d, __u32 id,
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const struct btf_dump_emit_type_decl_opts *opts);
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struct btf_dump_type_data_opts {
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/* size of this struct, for forward/backward compatibility */
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size_t sz;
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const char *indent_str;
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int indent_level;
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/* below match "show" flags for bpf_show_snprintf() */
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bool compact; /* no newlines/indentation */
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bool skip_names; /* skip member/type names */
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bool emit_zeroes; /* show 0-valued fields */
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size_t :0;
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};
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#define btf_dump_type_data_opts__last_field emit_zeroes
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LIBBPF_API int
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btf_dump__dump_type_data(struct btf_dump *d, __u32 id,
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const void *data, size_t data_sz,
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const struct btf_dump_type_data_opts *opts);
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/*
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* A set of helpers for easier BTF types handling.
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*
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* The inline functions below rely on constants from the kernel headers which
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* may not be available for applications including this header file. To avoid
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* compilation errors, we define all the constants here that were added after
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* the initial introduction of the BTF_KIND* constants.
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*/
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#ifndef BTF_KIND_FUNC
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#define BTF_KIND_FUNC 12 /* Function */
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#define BTF_KIND_FUNC_PROTO 13 /* Function Proto */
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#endif
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#ifndef BTF_KIND_VAR
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#define BTF_KIND_VAR 14 /* Variable */
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#define BTF_KIND_DATASEC 15 /* Section */
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#endif
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#ifndef BTF_KIND_FLOAT
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#define BTF_KIND_FLOAT 16 /* Floating point */
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#endif
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/* The kernel header switched to enums, so the following were never #defined */
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#define BTF_KIND_DECL_TAG 17 /* Decl Tag */
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#define BTF_KIND_TYPE_TAG 18 /* Type Tag */
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#define BTF_KIND_ENUM64 19 /* Enum for up-to 64bit values */
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static inline __u16 btf_kind(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info);
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}
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static inline __u16 btf_vlen(const struct btf_type *t)
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{
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return BTF_INFO_VLEN(t->info);
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}
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static inline bool btf_kflag(const struct btf_type *t)
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{
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return BTF_INFO_KFLAG(t->info);
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}
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static inline bool btf_is_void(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_UNKN;
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}
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static inline bool btf_is_int(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_INT;
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}
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static inline bool btf_is_ptr(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_PTR;
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}
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static inline bool btf_is_array(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_ARRAY;
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}
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static inline bool btf_is_struct(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_STRUCT;
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}
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static inline bool btf_is_union(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_UNION;
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}
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static inline bool btf_is_composite(const struct btf_type *t)
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{
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__u16 kind = btf_kind(t);
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return kind == BTF_KIND_STRUCT || kind == BTF_KIND_UNION;
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}
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static inline bool btf_is_enum(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_ENUM;
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}
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static inline bool btf_is_enum64(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_ENUM64;
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}
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static inline bool btf_is_fwd(const struct btf_type *t)
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|
{
|
|
return btf_kind(t) == BTF_KIND_FWD;
|
|
}
|
|
|
|
static inline bool btf_is_typedef(const struct btf_type *t)
|
|
{
|
|
return btf_kind(t) == BTF_KIND_TYPEDEF;
|
|
}
|
|
|
|
static inline bool btf_is_volatile(const struct btf_type *t)
|
|
{
|
|
return btf_kind(t) == BTF_KIND_VOLATILE;
|
|
}
|
|
|
|
static inline bool btf_is_const(const struct btf_type *t)
|
|
{
|
|
return btf_kind(t) == BTF_KIND_CONST;
|
|
}
|
|
|
|
static inline bool btf_is_restrict(const struct btf_type *t)
|
|
{
|
|
return btf_kind(t) == BTF_KIND_RESTRICT;
|
|
}
|
|
|
|
static inline bool btf_is_mod(const struct btf_type *t)
|
|
{
|
|
__u16 kind = btf_kind(t);
|
|
|
|
return kind == BTF_KIND_VOLATILE ||
|
|
kind == BTF_KIND_CONST ||
|
|
kind == BTF_KIND_RESTRICT ||
|
|
kind == BTF_KIND_TYPE_TAG;
|
|
}
|
|
|
|
static inline bool btf_is_func(const struct btf_type *t)
|
|
{
|
|
return btf_kind(t) == BTF_KIND_FUNC;
|
|
}
|
|
|
|
static inline bool btf_is_func_proto(const struct btf_type *t)
|
|
{
|
|
return btf_kind(t) == BTF_KIND_FUNC_PROTO;
|
|
}
|
|
|
|
static inline bool btf_is_var(const struct btf_type *t)
|
|
{
|
|
return btf_kind(t) == BTF_KIND_VAR;
|
|
}
|
|
|
|
static inline bool btf_is_datasec(const struct btf_type *t)
|
|
{
|
|
return btf_kind(t) == BTF_KIND_DATASEC;
|
|
}
|
|
|
|
static inline bool btf_is_float(const struct btf_type *t)
|
|
{
|
|
return btf_kind(t) == BTF_KIND_FLOAT;
|
|
}
|
|
|
|
static inline bool btf_is_decl_tag(const struct btf_type *t)
|
|
{
|
|
return btf_kind(t) == BTF_KIND_DECL_TAG;
|
|
}
|
|
|
|
static inline bool btf_is_type_tag(const struct btf_type *t)
|
|
{
|
|
return btf_kind(t) == BTF_KIND_TYPE_TAG;
|
|
}
|
|
|
|
static inline bool btf_is_any_enum(const struct btf_type *t)
|
|
{
|
|
return btf_is_enum(t) || btf_is_enum64(t);
|
|
}
|
|
|
|
static inline bool btf_kind_core_compat(const struct btf_type *t1,
|
|
const struct btf_type *t2)
|
|
{
|
|
return btf_kind(t1) == btf_kind(t2) ||
|
|
(btf_is_any_enum(t1) && btf_is_any_enum(t2));
|
|
}
|
|
|
|
static inline __u8 btf_int_encoding(const struct btf_type *t)
|
|
{
|
|
return BTF_INT_ENCODING(*(__u32 *)(t + 1));
|
|
}
|
|
|
|
static inline __u8 btf_int_offset(const struct btf_type *t)
|
|
{
|
|
return BTF_INT_OFFSET(*(__u32 *)(t + 1));
|
|
}
|
|
|
|
static inline __u8 btf_int_bits(const struct btf_type *t)
|
|
{
|
|
return BTF_INT_BITS(*(__u32 *)(t + 1));
|
|
}
|
|
|
|
static inline struct btf_array *btf_array(const struct btf_type *t)
|
|
{
|
|
return (struct btf_array *)(t + 1);
|
|
}
|
|
|
|
static inline struct btf_enum *btf_enum(const struct btf_type *t)
|
|
{
|
|
return (struct btf_enum *)(t + 1);
|
|
}
|
|
|
|
struct btf_enum64;
|
|
|
|
static inline struct btf_enum64 *btf_enum64(const struct btf_type *t)
|
|
{
|
|
return (struct btf_enum64 *)(t + 1);
|
|
}
|
|
|
|
static inline __u64 btf_enum64_value(const struct btf_enum64 *e)
|
|
{
|
|
/* struct btf_enum64 is introduced in Linux 6.0, which is very
|
|
* bleeding-edge. Here we are avoiding relying on struct btf_enum64
|
|
* definition coming from kernel UAPI headers to support wider range
|
|
* of system-wide kernel headers.
|
|
*
|
|
* Given this header can be also included from C++ applications, that
|
|
* further restricts C tricks we can use (like using compatible
|
|
* anonymous struct). So just treat struct btf_enum64 as
|
|
* a three-element array of u32 and access second (lo32) and third
|
|
* (hi32) elements directly.
|
|
*
|
|
* For reference, here is a struct btf_enum64 definition:
|
|
*
|
|
* const struct btf_enum64 {
|
|
* __u32 name_off;
|
|
* __u32 val_lo32;
|
|
* __u32 val_hi32;
|
|
* };
|
|
*/
|
|
const __u32 *e64 = (const __u32 *)e;
|
|
|
|
return ((__u64)e64[2] << 32) | e64[1];
|
|
}
|
|
|
|
static inline struct btf_member *btf_members(const struct btf_type *t)
|
|
{
|
|
return (struct btf_member *)(t + 1);
|
|
}
|
|
|
|
/* Get bit offset of a member with specified index. */
|
|
static inline __u32 btf_member_bit_offset(const struct btf_type *t,
|
|
__u32 member_idx)
|
|
{
|
|
const struct btf_member *m = btf_members(t) + member_idx;
|
|
bool kflag = btf_kflag(t);
|
|
|
|
return kflag ? BTF_MEMBER_BIT_OFFSET(m->offset) : m->offset;
|
|
}
|
|
/*
|
|
* Get bitfield size of a member, assuming t is BTF_KIND_STRUCT or
|
|
* BTF_KIND_UNION. If member is not a bitfield, zero is returned.
|
|
*/
|
|
static inline __u32 btf_member_bitfield_size(const struct btf_type *t,
|
|
__u32 member_idx)
|
|
{
|
|
const struct btf_member *m = btf_members(t) + member_idx;
|
|
bool kflag = btf_kflag(t);
|
|
|
|
return kflag ? BTF_MEMBER_BITFIELD_SIZE(m->offset) : 0;
|
|
}
|
|
|
|
static inline struct btf_param *btf_params(const struct btf_type *t)
|
|
{
|
|
return (struct btf_param *)(t + 1);
|
|
}
|
|
|
|
static inline struct btf_var *btf_var(const struct btf_type *t)
|
|
{
|
|
return (struct btf_var *)(t + 1);
|
|
}
|
|
|
|
static inline struct btf_var_secinfo *
|
|
btf_var_secinfos(const struct btf_type *t)
|
|
{
|
|
return (struct btf_var_secinfo *)(t + 1);
|
|
}
|
|
|
|
struct btf_decl_tag;
|
|
static inline struct btf_decl_tag *btf_decl_tag(const struct btf_type *t)
|
|
{
|
|
return (struct btf_decl_tag *)(t + 1);
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
} /* extern "C" */
|
|
#endif
|
|
|
|
#endif /* __LIBBPF_BTF_H */
|