diff options
Diffstat (limited to 'samples/bpf/sockex1_kern.c')
-rw-r--r-- | samples/bpf/sockex1_kern.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/samples/bpf/sockex1_kern.c b/samples/bpf/sockex1_kern.c new file mode 100644 index 000000000000..066892662915 --- /dev/null +++ b/samples/bpf/sockex1_kern.c | |||
@@ -0,0 +1,25 @@ | |||
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"; | ||