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Thomas Gleixner25763b32019-05-28 10:10:09 -07001// SPDX-License-Identifier: GPL-2.0-only
Yonghong Song1da236b6b2017-08-04 16:00:10 -07002/* Copyright (c) 2017 Facebook
Yonghong Song1da236b6b2017-08-04 16:00:10 -07003 */
4#include <uapi/linux/bpf.h>
Toke Høiland-Jørgensen7cf245a2020-01-20 14:06:49 +01005#include <bpf/bpf_helpers.h>
Yonghong Song1da236b6b2017-08-04 16:00:10 -07006
7struct syscalls_enter_open_args {
8 unsigned long long unused;
9 long syscall_nr;
10 long filename_ptr;
11 long flags;
12 long mode;
13};
14
15struct syscalls_exit_open_args {
16 unsigned long long unused;
17 long syscall_nr;
18 long ret;
19};
20
21struct bpf_map_def SEC("maps") enter_open_map = {
22 .type = BPF_MAP_TYPE_ARRAY,
23 .key_size = sizeof(u32),
24 .value_size = sizeof(u32),
25 .max_entries = 1,
26};
27
28struct bpf_map_def SEC("maps") exit_open_map = {
29 .type = BPF_MAP_TYPE_ARRAY,
30 .key_size = sizeof(u32),
31 .value_size = sizeof(u32),
32 .max_entries = 1,
33};
34
35static __always_inline void count(void *map)
36{
37 u32 key = 0;
38 u32 *value, init_val = 1;
39
40 value = bpf_map_lookup_elem(map, &key);
41 if (value)
42 *value += 1;
43 else
44 bpf_map_update_elem(map, &key, &init_val, BPF_NOEXIST);
45}
46
47SEC("tracepoint/syscalls/sys_enter_open")
48int trace_enter_open(struct syscalls_enter_open_args *ctx)
49{
Daniel T. Leefe330082019-12-05 17:01:14 +090050 count(&enter_open_map);
51 return 0;
52}
53
54SEC("tracepoint/syscalls/sys_enter_openat")
55int trace_enter_open_at(struct syscalls_enter_open_args *ctx)
56{
57 count(&enter_open_map);
Yonghong Song1da236b6b2017-08-04 16:00:10 -070058 return 0;
59}
60
61SEC("tracepoint/syscalls/sys_exit_open")
62int trace_enter_exit(struct syscalls_exit_open_args *ctx)
63{
Daniel T. Leefe330082019-12-05 17:01:14 +090064 count(&exit_open_map);
65 return 0;
66}
67
68SEC("tracepoint/syscalls/sys_exit_openat")
69int trace_enter_exit_at(struct syscalls_exit_open_args *ctx)
70{
71 count(&exit_open_map);
Yonghong Song1da236b6b2017-08-04 16:00:10 -070072 return 0;
73}