1145170Sdas// SPDX-License-Identifier: GPL-2.0
2130767Sdas#include <linux/bpf.h>
3130767Sdas
4130767Sdas#include <bpf/bpf_helpers.h>
5130767Sdas
6130767Sdasstruct {
7130767Sdas	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
8130767Sdas	__uint(max_entries, 3);
9130767Sdas	__uint(key_size, sizeof(__u32));
10130767Sdas	__uint(value_size, sizeof(__u32));
11130767Sdas} jmp_table SEC(".maps");
12130767Sdas
13130767Sdasint selector = 0;
14130767Sdas
15130767Sdas#define TAIL_FUNC(x)				\
16130767Sdas	SEC("tc")				\
17130767Sdas	int classifier_##x(struct __sk_buff *skb)	\
18130767Sdas	{					\
19130767Sdas		return x;			\
20130767Sdas	}
21130767SdasTAIL_FUNC(0)
22130767SdasTAIL_FUNC(1)
23130767SdasTAIL_FUNC(2)
24130767Sdas
25130767SdasSEC("tc")
26130767Sdasint entry(struct __sk_buff *skb)
27145170Sdas{
28130767Sdas	bpf_tail_call(skb, &jmp_table, selector);
29130767Sdas	return 3;
30130767Sdas}
31130767Sdas
32145170Sdaschar __license[] SEC("license") = "GPL";
33145170Sdas