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