1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2019 Facebook
3 #include <linux/bpf.h>
4 #include "bpf_helpers.h"
5 
6 char _license[] SEC("license") = "GPL";
7 
8 SEC("socket")
combinations(volatile struct __sk_buff * skb)9 int combinations(volatile struct __sk_buff* skb)
10 {
11 	int ret = 0, i;
12 
13 #pragma nounroll
14 	for (i = 0; i < 20; i++)
15 		if (skb->len)
16 			ret |= 1 << i;
17 	return ret;
18 }
19