1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* Copyright (C) 2022. Huawei Technologies Co., Ltd */ |
3 | #include <linux/bpf.h> |
4 | #include <bpf/bpf_helpers.h> |
5 | #include <bpf/bpf_tracing.h> |
6 | |
7 | char _license[] SEC("license" ) = "GPL" ; |
8 | |
9 | struct { |
10 | __uint(type, BPF_MAP_TYPE_HASH); |
11 | __uint(max_entries, 1); |
12 | __uint(key_size, sizeof(__u32)); |
13 | __uint(value_size, sizeof(__u32)); |
14 | } htab SEC(".maps" ); |
15 | |
16 | int pid = 0; |
17 | int update_err = 0; |
18 | |
19 | SEC("?fentry/lookup_elem_raw" ) |
20 | int lookup_elem_raw(void *ctx) |
21 | { |
22 | __u32 key = 0, value = 1; |
23 | |
24 | if ((bpf_get_current_pid_tgid() >> 32) != pid) |
25 | return 0; |
26 | |
27 | update_err = bpf_map_update_elem(&htab, &key, &value, 0); |
28 | return 0; |
29 | } |
30 | |