141 lines
5.1 KiB
C
141 lines
5.1 KiB
C
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
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/*
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* Libbpf legacy APIs (either discouraged or deprecated, as mentioned in [0])
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*
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* [0] https://docs.google.com/document/d/1UyjTZuPFWiPFyKk1tV5an11_iaRuec6U-ZESZ54nNTY
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*
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* Copyright (C) 2021 Facebook
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*/
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#ifndef __LIBBPF_LEGACY_BPF_H
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#define __LIBBPF_LEGACY_BPF_H
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#include <linux/bpf.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.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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/* As of libbpf 1.0 libbpf_set_strict_mode() and enum libbpf_struct_mode have
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* no effect. But they are left in libbpf_legacy.h so that applications that
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* prepared for libbpf 1.0 before final release by using
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* libbpf_set_strict_mode() still work with libbpf 1.0+ without any changes.
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*/
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enum libbpf_strict_mode {
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/* Turn on all supported strict features of libbpf to simulate libbpf
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* v1.0 behavior.
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* This will be the default behavior in libbpf v1.0.
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*/
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LIBBPF_STRICT_ALL = 0xffffffff,
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/*
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* Disable any libbpf 1.0 behaviors. This is the default before libbpf
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* v1.0. It won't be supported anymore in v1.0, please update your
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* code so that it handles LIBBPF_STRICT_ALL mode before libbpf v1.0.
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*/
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LIBBPF_STRICT_NONE = 0x00,
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/*
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* Return NULL pointers on error, not ERR_PTR(err).
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* Additionally, libbpf also always sets errno to corresponding Exx
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* (positive) error code.
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*/
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LIBBPF_STRICT_CLEAN_PTRS = 0x01,
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/*
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* Return actual error codes from low-level APIs directly, not just -1.
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* Additionally, libbpf also always sets errno to corresponding Exx
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* (positive) error code.
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*/
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LIBBPF_STRICT_DIRECT_ERRS = 0x02,
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/*
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* Enforce strict BPF program section (SEC()) names.
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* E.g., while prefiously SEC("xdp_whatever") or SEC("perf_event_blah") were
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* allowed, with LIBBPF_STRICT_SEC_PREFIX this will become
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* unrecognized by libbpf and would have to be just SEC("xdp") and
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* SEC("xdp") and SEC("perf_event").
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*
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* Note, in this mode the program pin path will be based on the
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* function name instead of section name.
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*
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* Additionally, routines in the .text section are always considered
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* sub-programs. Legacy behavior allows for a single routine in .text
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* to be a program.
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*/
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LIBBPF_STRICT_SEC_NAME = 0x04,
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/*
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* Disable the global 'bpf_objects_list'. Maintaining this list adds
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* a race condition to bpf_object__open() and bpf_object__close().
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* Clients can maintain it on their own if it is valuable for them.
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*/
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LIBBPF_STRICT_NO_OBJECT_LIST = 0x08,
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/*
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* Automatically bump RLIMIT_MEMLOCK using setrlimit() before the
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* first BPF program or map creation operation. This is done only if
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* kernel is too old to support memcg-based memory accounting for BPF
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* subsystem. By default, RLIMIT_MEMLOCK limit is set to RLIM_INFINITY,
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* but it can be overriden with libbpf_set_memlock_rlim() API.
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* Note that libbpf_set_memlock_rlim() needs to be called before
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* the very first bpf_prog_load(), bpf_map_create() or bpf_object__load()
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* operation.
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*/
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LIBBPF_STRICT_AUTO_RLIMIT_MEMLOCK = 0x10,
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/*
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* Error out on any SEC("maps") map definition, which are deprecated
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* in favor of BTF-defined map definitions in SEC(".maps").
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*/
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LIBBPF_STRICT_MAP_DEFINITIONS = 0x20,
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__LIBBPF_STRICT_LAST,
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};
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LIBBPF_API int libbpf_set_strict_mode(enum libbpf_strict_mode mode);
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/**
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* @brief **libbpf_get_error()** extracts the error code from the passed
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* pointer
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* @param ptr pointer returned from libbpf API function
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* @return error code; or 0 if no error occured
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*
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* Note, as of libbpf 1.0 this function is not necessary and not recommended
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* to be used. Libbpf doesn't return error code embedded into the pointer
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* itself. Instead, NULL is returned on error and error code is passed through
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* thread-local errno variable. **libbpf_get_error()** is just returning -errno
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* value if it receives NULL, which is correct only if errno hasn't been
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* modified between libbpf API call and corresponding **libbpf_get_error()**
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* call. Prefer to check return for NULL and use errno directly.
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*
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* This API is left in libbpf 1.0 to allow applications that were 1.0-ready
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* before final libbpf 1.0 without needing to change them.
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*/
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LIBBPF_API long libbpf_get_error(const void *ptr);
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#define DECLARE_LIBBPF_OPTS LIBBPF_OPTS
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/* "Discouraged" APIs which don't follow consistent libbpf naming patterns.
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* They are normally a trivial aliases or wrappers for proper APIs and are
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* left to minimize unnecessary disruption for users of libbpf. But they
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* shouldn't be used going forward.
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*/
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struct bpf_program;
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struct bpf_map;
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struct btf;
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struct btf_ext;
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LIBBPF_API struct btf *libbpf_find_kernel_btf(void);
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LIBBPF_API enum bpf_prog_type bpf_program__get_type(const struct bpf_program *prog);
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LIBBPF_API enum bpf_attach_type bpf_program__get_expected_attach_type(const struct bpf_program *prog);
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LIBBPF_API const char *bpf_map__get_pin_path(const struct bpf_map *map);
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LIBBPF_API const void *btf__get_raw_data(const struct btf *btf, __u32 *size);
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LIBBPF_API const void *btf_ext__get_raw_data(const struct btf_ext *btf_ext, __u32 *size);
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* __LIBBPF_LEGACY_BPF_H */
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