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 #if !defined(__aarch64__)
8 struct syscalls_enter_open_args {
9 unsigned long long unused;
10 long syscall_nr;
11 long filename_ptr;
12 long flags;
13 long mode;
14 };
15 #endif
16
17 struct syscalls_exit_open_args {
18 unsigned long long unused;
19 long syscall_nr;
20 long ret;
21 };
22
23 struct syscalls_enter_open_at_args {
24 unsigned long long unused;
25 long syscall_nr;
26 long long dfd;
27 long filename_ptr;
28 long flags;
29 long mode;
30 };
31
32 struct {
33 __uint(type, BPF_MAP_TYPE_ARRAY);
34 __type(key, u32);
35 __type(value, u32);
36 __uint(max_entries, 1);
37 } enter_open_map SEC(".maps");
38
39 struct {
40 __uint(type, BPF_MAP_TYPE_ARRAY);
41 __type(key, u32);
42 __type(value, u32);
43 __uint(max_entries, 1);
44 } exit_open_map SEC(".maps");
45
46 static __always_inline void count(void *map)
47 {
48 u32 key = 0;
49 u32 *value, init_val = 1;
50
51 value = bpf_map_lookup_elem(map, &key);
52 if (value)
53 *value += 1;
54 else
55 bpf_map_update_elem(map, &key, &init_val, BPF_NOEXIST);
56 }
57
58 #if !defined(__aarch64__)
59 SEC("tracepoint/syscalls/sys_enter_open")
60 int trace_enter_open(struct syscalls_enter_open_args *ctx)
61 {
62 count(&enter_open_map);
63 return 0;
64 }
65 #endif
66
67 SEC("tracepoint/syscalls/sys_enter_openat")
68 int trace_enter_open_at(struct syscalls_enter_open_at_args *ctx)
69 {
70 count(&enter_open_map);
71 return 0;
72 }
73
74 SEC("tracepoint/syscalls/sys_enter_openat2")
75 int trace_enter_open_at2(struct syscalls_enter_open_at_args *ctx)
76 {
77 count(&enter_open_map);
78 return 0;
79 }
80
81 #if !defined(__aarch64__)
82 SEC("tracepoint/syscalls/sys_exit_open")
83 int trace_enter_exit(struct syscalls_exit_open_args *ctx)
84 {
85 count(&exit_open_map);
86 return 0;
87 }
88 #endif
89
90 SEC("tracepoint/syscalls/sys_exit_openat")
91 int trace_enter_exit_at(struct syscalls_exit_open_args *ctx)
92 {
93 count(&exit_open_map);
94 return 0;
95 }
96
97 SEC("tracepoint/syscalls/sys_exit_openat2")
98 int trace_enter_exit_at2(struct syscalls_exit_open_args *ctx)
99 {
100 count(&exit_open_map);
101 return 0;
102 }
103
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