1
2
3
4#include <uapi/linux/bpf.h>
5#include <bpf/bpf_helpers.h>
6
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 {
22 __uint(type, BPF_MAP_TYPE_ARRAY);
23 __type(key, u32);
24 __type(value, u32);
25 __uint(max_entries, 1);
26} enter_open_map SEC(".maps");
27
28struct {
29 __uint(type, BPF_MAP_TYPE_ARRAY);
30 __type(key, u32);
31 __type(value, u32);
32 __uint(max_entries, 1);
33} exit_open_map SEC(".maps");
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{
50 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);
58 return 0;
59}
60
61SEC("tracepoint/syscalls/sys_exit_open")
62int trace_enter_exit(struct syscalls_exit_open_args *ctx)
63{
64 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);
72 return 0;
73}
74
