| // SPDX-License-Identifier: GPL-2.0 |
| /* Copyright (C) 2022. Huawei Technologies Co., Ltd */ |
| #include <linux/bpf.h> |
| #include <bpf/bpf_helpers.h> |
| #include <bpf/bpf_tracing.h> |
| |
| char _license[] SEC("license") = "GPL"; |
| |
| struct { |
| __uint(type, BPF_MAP_TYPE_HASH); |
| __uint(max_entries, 1); |
| __uint(key_size, sizeof(__u32)); |
| __uint(value_size, sizeof(__u32)); |
| } htab SEC(".maps"); |
| |
| int pid = 0; |
| int update_err = 0; |
| |
| SEC("?fentry/lookup_elem_raw") |
| int lookup_elem_raw(void *ctx) |
| { |
| __u32 key = 0, value = 1; |
| |
| if ((bpf_get_current_pid_tgid() >> 32) != pid) |
| return 0; |
| |
| update_err = bpf_map_update_elem(&htab, &key, &value, 0); |
| return 0; |
| } |
