1 /* SPDX-License-Identifier: GPL-2.0 */
2 // Copyright (c) 2018 Politecnico di Torino
6 #include <linux/if_ether.h>
8 #include <linux/pkt_cls.h>
9 #include "bpf_helpers.h"
11 int _version SEC("version") = 1;
14 __uint(type, MAP_TYPE);
15 __uint(max_entries, 32);
18 __uint(value_size, sizeof(__u32));
19 } map_in SEC(".maps");
22 __uint(type, MAP_TYPE);
23 __uint(max_entries, 32);
26 __uint(value_size, sizeof(__u32));
27 } map_out SEC(".maps");
30 int _test(struct __sk_buff *skb)
32 void *data_end = (void *)(long)skb->data_end;
33 void *data = (void *)(long)skb->data;
34 struct ethhdr *eth = (struct ethhdr *)(data);
38 if (eth + 1 > data_end)
41 struct iphdr *iph = (struct iphdr *)(eth + 1);
43 if (iph + 1 > data_end)
46 err = bpf_map_pop_elem(&map_in, &value);
52 err = bpf_map_push_elem(&map_out, &iph->saddr, 0);
59 char _license[] SEC("license") = "GPL";