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
 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}