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c09add2fbc
Two new libbpf APIs are added to support bpf_iter:
- bpf_program__attach_iter
Given a bpf program and additional parameters, which is
none now, returns a bpf_link.
- bpf_iter_create
syscall level API to create a bpf iterator.
The macro BPF_SEQ_PRINTF are also introduced. The format
looks like:
BPF_SEQ_PRINTF(seq, "task id %d\n", pid);
This macro can help bpf program writers with
nicer bpf_seq_printf syntax similar to the kernel one.
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200509175917.2476936-1-yhs@fb.com
243 lines
8.3 KiB
C
243 lines
8.3 KiB
C
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
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/*
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* common eBPF 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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#ifdef __cplusplus
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extern "C" {
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#endif
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struct bpf_create_map_attr {
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const char *name;
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enum bpf_map_type map_type;
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__u32 map_flags;
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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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__u32 numa_node;
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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 map_ifindex;
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union {
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__u32 inner_map_fd;
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__u32 btf_vmlinux_value_type_id;
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};
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};
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LIBBPF_API int
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bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr);
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LIBBPF_API int bpf_create_map_node(enum bpf_map_type map_type, const char *name,
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int key_size, int value_size,
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int max_entries, __u32 map_flags, int node);
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LIBBPF_API int bpf_create_map_name(enum bpf_map_type map_type, const char *name,
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int key_size, int value_size,
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int max_entries, __u32 map_flags);
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LIBBPF_API int bpf_create_map(enum bpf_map_type map_type, int key_size,
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int value_size, int max_entries, __u32 map_flags);
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LIBBPF_API int bpf_create_map_in_map_node(enum bpf_map_type map_type,
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const char *name, int key_size,
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int inner_map_fd, int max_entries,
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__u32 map_flags, int node);
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LIBBPF_API int bpf_create_map_in_map(enum bpf_map_type map_type,
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const char *name, int key_size,
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int inner_map_fd, int max_entries,
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__u32 map_flags);
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struct bpf_load_program_attr {
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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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const char *name;
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const struct bpf_insn *insns;
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size_t insns_cnt;
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const char *license;
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union {
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__u32 kern_version;
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__u32 attach_prog_fd;
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};
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union {
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__u32 prog_ifindex;
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__u32 attach_btf_id;
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};
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__u32 prog_btf_fd;
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__u32 func_info_rec_size;
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const void *func_info;
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__u32 func_info_cnt;
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__u32 line_info_rec_size;
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const void *line_info;
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__u32 line_info_cnt;
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__u32 log_level;
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__u32 prog_flags;
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};
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/* Flags to direct loading requirements */
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#define MAPS_RELAX_COMPAT 0x01
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/* Recommend 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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LIBBPF_API int
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bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr,
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char *log_buf, size_t log_buf_sz);
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LIBBPF_API int bpf_load_program(enum bpf_prog_type type,
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const struct bpf_insn *insns, size_t insns_cnt,
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const char *license, __u32 kern_version,
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char *log_buf, size_t log_buf_sz);
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LIBBPF_API int bpf_verify_program(enum bpf_prog_type type,
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const struct bpf_insn *insns,
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size_t insns_cnt, __u32 prog_flags,
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const char *license, __u32 kern_version,
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char *log_buf, size_t log_buf_sz,
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int log_level);
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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_delete_elem(int fd, const void *key);
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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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LIBBPF_API int bpf_map_delete_batch(int fd, void *keys,
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__u32 *count,
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const struct bpf_map_batch_opts *opts);
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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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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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LIBBPF_API int bpf_map_update_batch(int fd, void *keys, void *values,
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__u32 *count,
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const struct bpf_map_batch_opts *opts);
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LIBBPF_API int bpf_obj_pin(int fd, const char *pathname);
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LIBBPF_API int bpf_obj_get(const char *pathname);
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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_xattr(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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struct bpf_link_create_opts {
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size_t sz; /* size of this struct for forward/backward compatibility */
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};
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#define bpf_link_create_opts__last_field sz
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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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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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};
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#define bpf_link_update_opts__last_field old_prog_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_test_run_xattr(struct bpf_prog_test_run_attr *test_attr);
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/*
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* bpf_prog_test_run does not check that data_out is large enough. Consider
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* using bpf_prog_test_run_xattr instead.
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*/
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LIBBPF_API int bpf_prog_test_run(int prog_fd, int repeat, void *data,
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__u32 size, void *data_out, __u32 *size_out,
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__u32 *retval, __u32 *duration);
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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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LIBBPF_API int bpf_prog_get_fd_by_id(__u32 id);
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LIBBPF_API int bpf_map_get_fd_by_id(__u32 id);
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LIBBPF_API int bpf_btf_get_fd_by_id(__u32 id);
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LIBBPF_API int bpf_link_get_fd_by_id(__u32 id);
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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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LIBBPF_API int bpf_prog_query(int target_fd, enum bpf_attach_type type,
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__u32 query_flags, __u32 *attach_flags,
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__u32 *prog_ids, __u32 *prog_cnt);
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LIBBPF_API int bpf_raw_tracepoint_open(const char *name, int prog_fd);
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LIBBPF_API int bpf_load_btf(void *btf, __u32 btf_size, char *log_buf,
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__u32 log_buf_size, bool do_log);
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LIBBPF_API int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf,
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__u32 *buf_len, __u32 *prog_id, __u32 *fd_type,
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__u64 *probe_offset, __u64 *probe_addr);
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LIBBPF_API int bpf_enable_stats(enum bpf_stats_type type);
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* __LIBBPF_BPF_H */
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