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25763b3c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da236b6 | 2 | /* Copyright (c) 2017 Facebook |
1da236b6 YS |
3 | */ |
4 | #include <uapi/linux/bpf.h> | |
7cf245a3 | 5 | #include <bpf/bpf_helpers.h> |
1da236b6 YS |
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 | ||
f0c328f8 DL |
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"); | |
1da236b6 | 27 | |
f0c328f8 DL |
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"); | |
1da236b6 YS |
34 | |
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") | |
48 | int trace_enter_open(struct syscalls_enter_open_args *ctx) | |
49 | { | |
fe330089 DL |
50 | count(&enter_open_map); |
51 | return 0; | |
52 | } | |
53 | ||
54 | SEC("tracepoint/syscalls/sys_enter_openat") | |
55 | int trace_enter_open_at(struct syscalls_enter_open_args *ctx) | |
56 | { | |
57 | count(&enter_open_map); | |
1da236b6 YS |
58 | return 0; |
59 | } | |
60 | ||
61 | SEC("tracepoint/syscalls/sys_exit_open") | |
62 | int trace_enter_exit(struct syscalls_exit_open_args *ctx) | |
63 | { | |
fe330089 DL |
64 | count(&exit_open_map); |
65 | return 0; | |
66 | } | |
67 | ||
68 | SEC("tracepoint/syscalls/sys_exit_openat") | |
69 | int trace_enter_exit_at(struct syscalls_exit_open_args *ctx) | |
70 | { | |
71 | count(&exit_open_map); | |
1da236b6 YS |
72 | return 0; |
73 | } |