559 lines
20 KiB
C
559 lines
20 KiB
C
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
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/*
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* Common BPF ELF 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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License (not later!)
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, see <http://www.gnu.org/licenses>
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*/
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#ifndef __LIBBPF_BPF_H
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#define __LIBBPF_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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#include "libbpf_legacy.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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int libbpf_set_memlock_rlim(size_t memlock_bytes);
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struct bpf_map_create_opts {
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size_t sz; /* size of this struct for forward/backward compatibility */
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__u32 btf_fd;
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__u32 btf_key_type_id;
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__u32 btf_value_type_id;
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__u32 btf_vmlinux_value_type_id;
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__u32 inner_map_fd;
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__u32 map_flags;
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__u64 map_extra;
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__u32 numa_node;
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__u32 map_ifindex;
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};
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#define bpf_map_create_opts__last_field map_ifindex
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LIBBPF_API int bpf_map_create(enum bpf_map_type map_type,
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const char *map_name,
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__u32 key_size,
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__u32 value_size,
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__u32 max_entries,
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const struct bpf_map_create_opts *opts);
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struct bpf_prog_load_opts {
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size_t sz; /* size of this struct for forward/backward compatibility */
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/* libbpf can retry BPF_PROG_LOAD command if bpf() syscall returns
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* -EAGAIN. This field determines how many attempts libbpf has to
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* make. If not specified, libbpf will use default value of 5.
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*/
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int attempts;
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enum bpf_attach_type expected_attach_type;
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__u32 prog_btf_fd;
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__u32 prog_flags;
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__u32 prog_ifindex;
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__u32 kern_version;
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__u32 attach_btf_id;
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__u32 attach_prog_fd;
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__u32 attach_btf_obj_fd;
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const int *fd_array;
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/* .BTF.ext func info data */
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const void *func_info;
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__u32 func_info_cnt;
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__u32 func_info_rec_size;
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/* .BTF.ext line info data */
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const void *line_info;
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__u32 line_info_cnt;
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__u32 line_info_rec_size;
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/* verifier log options */
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__u32 log_level;
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__u32 log_size;
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char *log_buf;
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/* output: actual total log contents size (including termintaing zero).
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* It could be both larger than original log_size (if log was
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* truncated), or smaller (if log buffer wasn't filled completely).
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* If kernel doesn't support this feature, log_size is left unchanged.
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*/
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__u32 log_true_size;
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size_t :0;
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};
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#define bpf_prog_load_opts__last_field log_true_size
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LIBBPF_API int bpf_prog_load(enum bpf_prog_type prog_type,
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const char *prog_name, const char *license,
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const struct bpf_insn *insns, size_t insn_cnt,
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struct bpf_prog_load_opts *opts);
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/* Flags to direct loading requirements */
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#define MAPS_RELAX_COMPAT 0x01
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/* Recommended log buffer size */
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#define BPF_LOG_BUF_SIZE (UINT32_MAX >> 8) /* verifier maximum in kernels <= 5.1 */
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struct bpf_btf_load_opts {
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size_t sz; /* size of this struct for forward/backward compatibility */
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/* kernel log options */
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char *log_buf;
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__u32 log_level;
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__u32 log_size;
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/* output: actual total log contents size (including termintaing zero).
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* It could be both larger than original log_size (if log was
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* truncated), or smaller (if log buffer wasn't filled completely).
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* If kernel doesn't support this feature, log_size is left unchanged.
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*/
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__u32 log_true_size;
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size_t :0;
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};
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#define bpf_btf_load_opts__last_field log_true_size
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LIBBPF_API int bpf_btf_load(const void *btf_data, size_t btf_size,
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struct bpf_btf_load_opts *opts);
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LIBBPF_API int bpf_map_update_elem(int fd, const void *key, const void *value,
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__u64 flags);
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LIBBPF_API int bpf_map_lookup_elem(int fd, const void *key, void *value);
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LIBBPF_API int bpf_map_lookup_elem_flags(int fd, const void *key, void *value,
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__u64 flags);
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LIBBPF_API int bpf_map_lookup_and_delete_elem(int fd, const void *key,
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void *value);
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LIBBPF_API int bpf_map_lookup_and_delete_elem_flags(int fd, const void *key,
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void *value, __u64 flags);
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LIBBPF_API int bpf_map_delete_elem(int fd, const void *key);
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LIBBPF_API int bpf_map_delete_elem_flags(int fd, const void *key, __u64 flags);
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LIBBPF_API int bpf_map_get_next_key(int fd, const void *key, void *next_key);
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LIBBPF_API int bpf_map_freeze(int fd);
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struct bpf_map_batch_opts {
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size_t sz; /* size of this struct for forward/backward compatibility */
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__u64 elem_flags;
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__u64 flags;
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};
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#define bpf_map_batch_opts__last_field flags
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/**
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* @brief **bpf_map_delete_batch()** allows for batch deletion of multiple
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* elements in a BPF map.
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*
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* @param fd BPF map file descriptor
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* @param keys pointer to an array of *count* keys
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* @param count input and output parameter; on input **count** represents the
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* number of elements in the map to delete in batch;
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* on output if a non-EFAULT error is returned, **count** represents the number of deleted
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* elements if the output **count** value is not equal to the input **count** value
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* If EFAULT is returned, **count** should not be trusted to be correct.
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* @param opts options for configuring the way the batch deletion works
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* @return 0, on success; negative error code, otherwise (errno is also set to
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* the error code)
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*/
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LIBBPF_API int bpf_map_delete_batch(int fd, const void *keys,
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__u32 *count,
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const struct bpf_map_batch_opts *opts);
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/**
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* @brief **bpf_map_lookup_batch()** allows for batch lookup of BPF map elements.
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*
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* The parameter *in_batch* is the address of the first element in the batch to read.
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* *out_batch* is an output parameter that should be passed as *in_batch* to subsequent
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* calls to **bpf_map_lookup_batch()**. NULL can be passed for *in_batch* to indicate
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* that the batched lookup starts from the beginning of the map.
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*
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* The *keys* and *values* are output parameters which must point to memory large enough to
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* hold *count* items based on the key and value size of the map *map_fd*. The *keys*
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* buffer must be of *key_size* * *count*. The *values* buffer must be of
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* *value_size* * *count*.
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*
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* @param fd BPF map file descriptor
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* @param in_batch address of the first element in batch to read, can pass NULL to
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* indicate that the batched lookup starts from the beginning of the map.
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* @param out_batch output parameter that should be passed to next call as *in_batch*
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* @param keys pointer to an array large enough for *count* keys
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* @param values pointer to an array large enough for *count* values
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* @param count input and output parameter; on input it's the number of elements
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* in the map to read in batch; on output it's the number of elements that were
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* successfully read.
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* If a non-EFAULT error is returned, count will be set as the number of elements
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* that were read before the error occurred.
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* If EFAULT is returned, **count** should not be trusted to be correct.
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* @param opts options for configuring the way the batch lookup works
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* @return 0, on success; negative error code, otherwise (errno is also set to
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* the error code)
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*/
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LIBBPF_API int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch,
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void *keys, void *values, __u32 *count,
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const struct bpf_map_batch_opts *opts);
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/**
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* @brief **bpf_map_lookup_and_delete_batch()** allows for batch lookup and deletion
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* of BPF map elements where each element is deleted after being retrieved.
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*
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* @param fd BPF map file descriptor
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* @param in_batch address of the first element in batch to read, can pass NULL to
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* get address of the first element in *out_batch*
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* @param out_batch output parameter that should be passed to next call as *in_batch*
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* @param keys pointer to an array of *count* keys
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* @param values pointer to an array large enough for *count* values
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* @param count input and output parameter; on input it's the number of elements
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* in the map to read and delete in batch; on output it represents the number of
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* elements that were successfully read and deleted
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* If a non-**EFAULT** error code is returned and if the output **count** value
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* is not equal to the input **count** value, up to **count** elements may
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* have been deleted.
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* if **EFAULT** is returned up to *count* elements may have been deleted without
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* being returned via the *keys* and *values* output parameters.
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* @param opts options for configuring the way the batch lookup and delete works
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* @return 0, on success; negative error code, otherwise (errno is also set to
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* the error code)
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*/
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LIBBPF_API int bpf_map_lookup_and_delete_batch(int fd, void *in_batch,
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void *out_batch, void *keys,
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void *values, __u32 *count,
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const struct bpf_map_batch_opts *opts);
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/**
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* @brief **bpf_map_update_batch()** updates multiple elements in a map
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* by specifying keys and their corresponding values.
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*
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* The *keys* and *values* parameters must point to memory large enough
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* to hold *count* items based on the key and value size of the map.
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*
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* The *opts* parameter can be used to control how *bpf_map_update_batch()*
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* should handle keys that either do or do not already exist in the map.
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* In particular the *flags* parameter of *bpf_map_batch_opts* can be
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* one of the following:
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*
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* Note that *count* is an input and output parameter, where on output it
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* represents how many elements were successfully updated. Also note that if
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* **EFAULT** then *count* should not be trusted to be correct.
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*
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* **BPF_ANY**
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* Create new elements or update existing.
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*
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* **BPF_NOEXIST**
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* Create new elements only if they do not exist.
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*
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* **BPF_EXIST**
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* Update existing elements.
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*
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* **BPF_F_LOCK**
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* Update spin_lock-ed map elements. This must be
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* specified if the map value contains a spinlock.
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*
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* @param fd BPF map file descriptor
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* @param keys pointer to an array of *count* keys
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* @param values pointer to an array of *count* values
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* @param count input and output parameter; on input it's the number of elements
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* in the map to update in batch; on output if a non-EFAULT error is returned,
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* **count** represents the number of updated elements if the output **count**
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* value is not equal to the input **count** value.
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* If EFAULT is returned, **count** should not be trusted to be correct.
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* @param opts options for configuring the way the batch update works
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* @return 0, on success; negative error code, otherwise (errno is also set to
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* the error code)
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*/
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LIBBPF_API int bpf_map_update_batch(int fd, const void *keys, const void *values,
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__u32 *count,
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const struct bpf_map_batch_opts *opts);
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struct bpf_obj_pin_opts {
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size_t sz; /* size of this struct for forward/backward compatibility */
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__u32 file_flags;
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int path_fd;
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size_t :0;
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};
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#define bpf_obj_pin_opts__last_field path_fd
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LIBBPF_API int bpf_obj_pin(int fd, const char *pathname);
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LIBBPF_API int bpf_obj_pin_opts(int fd, const char *pathname,
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const struct bpf_obj_pin_opts *opts);
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struct bpf_obj_get_opts {
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size_t sz; /* size of this struct for forward/backward compatibility */
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__u32 file_flags;
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int path_fd;
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size_t :0;
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};
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#define bpf_obj_get_opts__last_field path_fd
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LIBBPF_API int bpf_obj_get(const char *pathname);
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LIBBPF_API int bpf_obj_get_opts(const char *pathname,
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const struct bpf_obj_get_opts *opts);
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struct bpf_prog_attach_opts {
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size_t sz; /* size of this struct for forward/backward compatibility */
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unsigned int flags;
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int replace_prog_fd;
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};
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#define bpf_prog_attach_opts__last_field replace_prog_fd
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LIBBPF_API int bpf_prog_attach(int prog_fd, int attachable_fd,
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enum bpf_attach_type type, unsigned int flags);
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LIBBPF_API int bpf_prog_attach_opts(int prog_fd, int attachable_fd,
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enum bpf_attach_type type,
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const struct bpf_prog_attach_opts *opts);
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LIBBPF_API int bpf_prog_detach(int attachable_fd, enum bpf_attach_type type);
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LIBBPF_API int bpf_prog_detach2(int prog_fd, int attachable_fd,
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enum bpf_attach_type type);
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union bpf_iter_link_info; /* defined in up-to-date linux/bpf.h */
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struct bpf_link_create_opts {
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size_t sz; /* size of this struct for forward/backward compatibility */
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__u32 flags;
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union bpf_iter_link_info *iter_info;
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__u32 iter_info_len;
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__u32 target_btf_id;
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union {
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struct {
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__u64 bpf_cookie;
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} perf_event;
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struct {
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__u32 flags;
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__u32 cnt;
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const char **syms;
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const unsigned long *addrs;
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const __u64 *cookies;
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} kprobe_multi;
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struct {
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__u64 cookie;
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} tracing;
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};
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size_t :0;
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};
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#define bpf_link_create_opts__last_field kprobe_multi.cookies
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LIBBPF_API int bpf_link_create(int prog_fd, int target_fd,
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enum bpf_attach_type attach_type,
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const struct bpf_link_create_opts *opts);
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LIBBPF_API int bpf_link_detach(int link_fd);
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struct bpf_link_update_opts {
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size_t sz; /* size of this struct for forward/backward compatibility */
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__u32 flags; /* extra flags */
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__u32 old_prog_fd; /* expected old program FD */
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__u32 old_map_fd; /* expected old map FD */
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};
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#define bpf_link_update_opts__last_field old_map_fd
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LIBBPF_API int bpf_link_update(int link_fd, int new_prog_fd,
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const struct bpf_link_update_opts *opts);
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LIBBPF_API int bpf_iter_create(int link_fd);
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struct bpf_prog_test_run_attr {
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int prog_fd;
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int repeat;
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const void *data_in;
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__u32 data_size_in;
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void *data_out; /* optional */
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__u32 data_size_out; /* in: max length of data_out
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* out: length of data_out */
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__u32 retval; /* out: return code of the BPF program */
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__u32 duration; /* out: average per repetition in ns */
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const void *ctx_in; /* optional */
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__u32 ctx_size_in;
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void *ctx_out; /* optional */
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__u32 ctx_size_out; /* in: max length of ctx_out
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* out: length of cxt_out */
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};
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LIBBPF_API int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id);
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LIBBPF_API int bpf_map_get_next_id(__u32 start_id, __u32 *next_id);
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LIBBPF_API int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id);
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LIBBPF_API int bpf_link_get_next_id(__u32 start_id, __u32 *next_id);
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struct bpf_get_fd_by_id_opts {
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size_t sz; /* size of this struct for forward/backward compatibility */
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__u32 open_flags; /* permissions requested for the operation on fd */
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size_t :0;
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};
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#define bpf_get_fd_by_id_opts__last_field open_flags
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LIBBPF_API int bpf_prog_get_fd_by_id(__u32 id);
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LIBBPF_API int bpf_prog_get_fd_by_id_opts(__u32 id,
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const struct bpf_get_fd_by_id_opts *opts);
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LIBBPF_API int bpf_map_get_fd_by_id(__u32 id);
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LIBBPF_API int bpf_map_get_fd_by_id_opts(__u32 id,
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const struct bpf_get_fd_by_id_opts *opts);
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LIBBPF_API int bpf_btf_get_fd_by_id(__u32 id);
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LIBBPF_API int bpf_btf_get_fd_by_id_opts(__u32 id,
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const struct bpf_get_fd_by_id_opts *opts);
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LIBBPF_API int bpf_link_get_fd_by_id(__u32 id);
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LIBBPF_API int bpf_link_get_fd_by_id_opts(__u32 id,
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const struct bpf_get_fd_by_id_opts *opts);
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LIBBPF_API int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len);
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/**
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* @brief **bpf_prog_get_info_by_fd()** obtains information about the BPF
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* program corresponding to *prog_fd*.
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*
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* Populates up to *info_len* bytes of *info* and updates *info_len* with the
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* actual number of bytes written to *info*.
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*
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* @param prog_fd BPF program file descriptor
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* @param info pointer to **struct bpf_prog_info** that will be populated with
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* BPF program information
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* @param info_len pointer to the size of *info*; on success updated with the
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* number of bytes written to *info*
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* @return 0, on success; negative error code, otherwise (errno is also set to
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* the error code)
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*/
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LIBBPF_API int bpf_prog_get_info_by_fd(int prog_fd, struct bpf_prog_info *info, __u32 *info_len);
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/**
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* @brief **bpf_map_get_info_by_fd()** obtains information about the BPF
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* map corresponding to *map_fd*.
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*
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* Populates up to *info_len* bytes of *info* and updates *info_len* with the
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* actual number of bytes written to *info*.
|
|
*
|
|
* @param map_fd BPF map file descriptor
|
|
* @param info pointer to **struct bpf_map_info** that will be populated with
|
|
* BPF map information
|
|
* @param info_len pointer to the size of *info*; on success updated with the
|
|
* number of bytes written to *info*
|
|
* @return 0, on success; negative error code, otherwise (errno is also set to
|
|
* the error code)
|
|
*/
|
|
LIBBPF_API int bpf_map_get_info_by_fd(int map_fd, struct bpf_map_info *info, __u32 *info_len);
|
|
|
|
/**
|
|
* @brief **bpf_btf_get_info_by_fd()** obtains information about the
|
|
* BTF object corresponding to *btf_fd*.
|
|
*
|
|
* Populates up to *info_len* bytes of *info* and updates *info_len* with the
|
|
* actual number of bytes written to *info*.
|
|
*
|
|
* @param btf_fd BTF object file descriptor
|
|
* @param info pointer to **struct bpf_btf_info** that will be populated with
|
|
* BTF object information
|
|
* @param info_len pointer to the size of *info*; on success updated with the
|
|
* number of bytes written to *info*
|
|
* @return 0, on success; negative error code, otherwise (errno is also set to
|
|
* the error code)
|
|
*/
|
|
LIBBPF_API int bpf_btf_get_info_by_fd(int btf_fd, struct bpf_btf_info *info, __u32 *info_len);
|
|
|
|
/**
|
|
* @brief **bpf_btf_get_info_by_fd()** obtains information about the BPF
|
|
* link corresponding to *link_fd*.
|
|
*
|
|
* Populates up to *info_len* bytes of *info* and updates *info_len* with the
|
|
* actual number of bytes written to *info*.
|
|
*
|
|
* @param link_fd BPF link file descriptor
|
|
* @param info pointer to **struct bpf_link_info** that will be populated with
|
|
* BPF link information
|
|
* @param info_len pointer to the size of *info*; on success updated with the
|
|
* number of bytes written to *info*
|
|
* @return 0, on success; negative error code, otherwise (errno is also set to
|
|
* the error code)
|
|
*/
|
|
LIBBPF_API int bpf_link_get_info_by_fd(int link_fd, struct bpf_link_info *info, __u32 *info_len);
|
|
|
|
struct bpf_prog_query_opts {
|
|
size_t sz; /* size of this struct for forward/backward compatibility */
|
|
__u32 query_flags;
|
|
__u32 attach_flags; /* output argument */
|
|
__u32 *prog_ids;
|
|
__u32 prog_cnt; /* input+output argument */
|
|
__u32 *prog_attach_flags;
|
|
};
|
|
#define bpf_prog_query_opts__last_field prog_attach_flags
|
|
|
|
LIBBPF_API int bpf_prog_query_opts(int target_fd,
|
|
enum bpf_attach_type type,
|
|
struct bpf_prog_query_opts *opts);
|
|
LIBBPF_API int bpf_prog_query(int target_fd, enum bpf_attach_type type,
|
|
__u32 query_flags, __u32 *attach_flags,
|
|
__u32 *prog_ids, __u32 *prog_cnt);
|
|
|
|
LIBBPF_API int bpf_raw_tracepoint_open(const char *name, int prog_fd);
|
|
LIBBPF_API int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf,
|
|
__u32 *buf_len, __u32 *prog_id, __u32 *fd_type,
|
|
__u64 *probe_offset, __u64 *probe_addr);
|
|
|
|
#ifdef __cplusplus
|
|
/* forward-declaring enums in C++ isn't compatible with pure C enums, so
|
|
* instead define bpf_enable_stats() as accepting int as an input
|
|
*/
|
|
LIBBPF_API int bpf_enable_stats(int type);
|
|
#else
|
|
enum bpf_stats_type; /* defined in up-to-date linux/bpf.h */
|
|
LIBBPF_API int bpf_enable_stats(enum bpf_stats_type type);
|
|
#endif
|
|
|
|
struct bpf_prog_bind_opts {
|
|
size_t sz; /* size of this struct for forward/backward compatibility */
|
|
__u32 flags;
|
|
};
|
|
#define bpf_prog_bind_opts__last_field flags
|
|
|
|
LIBBPF_API int bpf_prog_bind_map(int prog_fd, int map_fd,
|
|
const struct bpf_prog_bind_opts *opts);
|
|
|
|
struct bpf_test_run_opts {
|
|
size_t sz; /* size of this struct for forward/backward compatibility */
|
|
const void *data_in; /* optional */
|
|
void *data_out; /* optional */
|
|
__u32 data_size_in;
|
|
__u32 data_size_out; /* in: max length of data_out
|
|
* out: length of data_out
|
|
*/
|
|
const void *ctx_in; /* optional */
|
|
void *ctx_out; /* optional */
|
|
__u32 ctx_size_in;
|
|
__u32 ctx_size_out; /* in: max length of ctx_out
|
|
* out: length of cxt_out
|
|
*/
|
|
__u32 retval; /* out: return code of the BPF program */
|
|
int repeat;
|
|
__u32 duration; /* out: average per repetition in ns */
|
|
__u32 flags;
|
|
__u32 cpu;
|
|
__u32 batch_size;
|
|
};
|
|
#define bpf_test_run_opts__last_field batch_size
|
|
|
|
LIBBPF_API int bpf_prog_test_run_opts(int prog_fd,
|
|
struct bpf_test_run_opts *opts);
|
|
|
|
#ifdef __cplusplus
|
|
} /* extern "C" */
|
|
#endif
|
|
|
|
#endif /* __LIBBPF_BPF_H */
|