| Alexei Starovoitov | a808578 | 2014-12-01 15:06:38 -0800 | [diff] [blame^] | 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"; |