2 * common eBPF ELF operations.
4 * Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org>
5 * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
6 * Copyright (C) 2015 Huawei Inc.
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation;
11 * version 2.1 of the License (not later!)
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this program; if not, see <http://www.gnu.org/licenses>
25 #include <asm/unistd.h>
26 #include <linux/bpf.h>
30 * When building perf, unistd.h is overrided. __NR_bpf is
31 * required to be defined explicitly.
34 # if defined(__i386__)
36 # elif defined(__x86_64__)
38 # elif defined(__aarch64__)
41 # error __NR_bpf not defined. libbpf does not support your arch.
45 static __u64
ptr_to_u64(void *ptr
)
47 return (__u64
) (unsigned long) ptr
;
50 static int sys_bpf(enum bpf_cmd cmd
, union bpf_attr
*attr
,
53 return syscall(__NR_bpf
, cmd
, attr
, size
);
56 int bpf_create_map(enum bpf_map_type map_type
, int key_size
,
57 int value_size
, int max_entries
)
61 memset(&attr
, '\0', sizeof(attr
));
63 attr
.map_type
= map_type
;
64 attr
.key_size
= key_size
;
65 attr
.value_size
= value_size
;
66 attr
.max_entries
= max_entries
;
68 return sys_bpf(BPF_MAP_CREATE
, &attr
, sizeof(attr
));
71 int bpf_load_program(enum bpf_prog_type type
, struct bpf_insn
*insns
,
72 size_t insns_cnt
, char *license
,
73 u32 kern_version
, char *log_buf
, size_t log_buf_sz
)
78 bzero(&attr
, sizeof(attr
));
79 attr
.prog_type
= type
;
80 attr
.insn_cnt
= (__u32
)insns_cnt
;
81 attr
.insns
= ptr_to_u64(insns
);
82 attr
.license
= ptr_to_u64(license
);
83 attr
.log_buf
= ptr_to_u64(NULL
);
86 attr
.kern_version
= kern_version
;
88 fd
= sys_bpf(BPF_PROG_LOAD
, &attr
, sizeof(attr
));
89 if (fd
>= 0 || !log_buf
|| !log_buf_sz
)
92 /* Try again with log */
93 attr
.log_buf
= ptr_to_u64(log_buf
);
94 attr
.log_size
= log_buf_sz
;
97 return sys_bpf(BPF_PROG_LOAD
, &attr
, sizeof(attr
));
100 int bpf_map_update_elem(int fd
, void *key
, void *value
,
105 bzero(&attr
, sizeof(attr
));
107 attr
.key
= ptr_to_u64(key
);
108 attr
.value
= ptr_to_u64(value
);
111 return sys_bpf(BPF_MAP_UPDATE_ELEM
, &attr
, sizeof(attr
));
This page took 0.046882 seconds and 5 git commands to generate.