1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2017 Facebook
3 */
4 #include <uapi/linux/bpf.h>
5 #include <bpf/bpf_helpers.h>
6
7 struct 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
15 struct syscalls_exit_open_args {
16 unsigned long long unused;
17 long syscall_nr;
18 long ret;
19 };
20
21 struct {
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
28 struct {
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
count(void * map)35 static __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
47 SEC("tracepoint/syscalls/sys_enter_open")
trace_enter_open(struct syscalls_enter_open_args * ctx)48 int trace_enter_open(struct syscalls_enter_open_args *ctx)
49 {
50 count(&enter_open_map);
51 return 0;
52 }
53
54 SEC("tracepoint/syscalls/sys_enter_openat")
trace_enter_open_at(struct syscalls_enter_open_args * ctx)55 int trace_enter_open_at(struct syscalls_enter_open_args *ctx)
56 {
57 count(&enter_open_map);
58 return 0;
59 }
60
61 SEC("tracepoint/syscalls/sys_exit_open")
trace_enter_exit(struct syscalls_exit_open_args * ctx)62 int trace_enter_exit(struct syscalls_exit_open_args *ctx)
63 {
64 count(&exit_open_map);
65 return 0;
66 }
67
68 SEC("tracepoint/syscalls/sys_exit_openat")
trace_enter_exit_at(struct syscalls_exit_open_args * ctx)69 int trace_enter_exit_at(struct syscalls_exit_open_args *ctx)
70 {
71 count(&exit_open_map);
72 return 0;
73 }
74