1#include <uapi/linux/bpf.h>
 2#include <uapi/linux/if_ether.h>
 3#include <uapi/linux/if_packet.h>
 4#include <uapi/linux/ip.h>
 5#include "bpf_helpers.h"
 6
 7struct bpf_map_def SEC("maps") my_map = {
 8	.type = BPF_MAP_TYPE_ARRAY,
 9	.key_size = sizeof(u32),
10	.value_size = sizeof(long),
11	.max_entries = 256,
12};
13
14SEC("socket1")
15int bpf_prog1(struct __sk_buff *skb)
16{
17	int index = load_byte(skb, ETH_HLEN + offsetof(struct iphdr, protocol));
18	long *value;
19
20	if (skb->pkt_type != PACKET_OUTGOING)
21		return 0;
22
23	value = bpf_map_lookup_elem(&my_map, &index);
24	if (value)
25		__sync_fetch_and_add(value, skb->len);
26
27	return 0;
28}
29char _license[] SEC("license") = "GPL";