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 #if !defined(__aarch64__)
48 SEC("tracepoint/syscalls/sys_enter_open")
trace_enter_open(struct syscalls_enter_open_args * ctx)49 int trace_enter_open(struct syscalls_enter_open_args *ctx)
50 {
51 count(&enter_open_map);
52 return 0;
53 }
54 #endif
55
56 SEC("tracepoint/syscalls/sys_enter_openat")
trace_enter_open_at(struct syscalls_enter_open_args * ctx)57 int trace_enter_open_at(struct syscalls_enter_open_args *ctx)
58 {
59 count(&enter_open_map);
60 return 0;
61 }
62
63 SEC("tracepoint/syscalls/sys_enter_openat2")
trace_enter_open_at2(struct syscalls_enter_open_args * ctx)64 int trace_enter_open_at2(struct syscalls_enter_open_args *ctx)
65 {
66 count(&enter_open_map);
67 return 0;
68 }
69
70 #if !defined(__aarch64__)
71 SEC("tracepoint/syscalls/sys_exit_open")
trace_enter_exit(struct syscalls_exit_open_args * ctx)72 int trace_enter_exit(struct syscalls_exit_open_args *ctx)
73 {
74 count(&exit_open_map);
75 return 0;
76 }
77 #endif
78
79 SEC("tracepoint/syscalls/sys_exit_openat")
trace_enter_exit_at(struct syscalls_exit_open_args * ctx)80 int trace_enter_exit_at(struct syscalls_exit_open_args *ctx)
81 {
82 count(&exit_open_map);
83 return 0;
84 }
85
86 SEC("tracepoint/syscalls/sys_exit_openat2")
trace_enter_exit_at2(struct syscalls_exit_open_args * ctx)87 int trace_enter_exit_at2(struct syscalls_exit_open_args *ctx)
88 {
89 count(&exit_open_map);
90 return 0;
91 }
92