30 lines
633 B
C
30 lines
633 B
C
// 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;
|
|
}
|