1// SPDX-License-Identifier: GPL-2.0
2// Copyright (c) 2020 Facebook
3
4#include <linux/stddef.h>
5#include <linux/bpf.h>
6#include <linux/pkt_cls.h>
7#include <bpf/bpf_endian.h>
8#include <bpf/bpf_helpers.h>
9
10struct {
11	__uint(type, BPF_MAP_TYPE_SOCKMAP);
12	__type(key, int);
13	__type(value, int);
14	__uint(max_entries, 2);
15} sock_map SEC(".maps");
16
17SEC("freplace/cls_redirect")
18int freplace_cls_redirect_test(struct __sk_buff *skb)
19{
20	int ret = 0;
21	const int zero = 0;
22	struct bpf_sock *sk;
23
24	sk = bpf_map_lookup_elem(&sock_map, &zero);
25	if (!sk)
26		return TC_ACT_SHOT;
27
28	ret = bpf_map_update_elem(&sock_map, &zero, sk, 0);
29	bpf_sk_release(sk);
30
31	return ret == 0 ? TC_ACT_OK : TC_ACT_SHOT;
32}
33
34char _license[] SEC("license") = "GPL";
35