1 #include <linux/bpf.h>
2 #include <bpf/bpf_helpers.h>
3 #include <bpf/bpf_endian.h>
4 #include "bpf_misc.h"
5
6 struct {
7 __uint(type, BPF_MAP_TYPE_SOCKMAP);
8 __uint(max_entries, 20);
9 __type(key, int);
10 __type(value, int);
11 } sock_map_rx SEC(".maps");
12
13 struct {
14 __uint(type, BPF_MAP_TYPE_SOCKMAP);
15 __uint(max_entries, 20);
16 __type(key, int);
17 __type(value, int);
18 } sock_map_tx SEC(".maps");
19
20 struct {
21 __uint(type, BPF_MAP_TYPE_SOCKMAP);
22 __uint(max_entries, 20);
23 __type(key, int);
24 __type(value, int);
25 } sock_map_msg SEC(".maps");
26
27 struct {
28 __uint(type, BPF_MAP_TYPE_ARRAY);
29 __uint(max_entries, 20);
30 __type(key, int);
31 __type(value, int);
32 } sock_map_break SEC(".maps");
33
34 SEC("sk_skb2")
bpf_prog2(struct __sk_buff * skb)35 int bpf_prog2(struct __sk_buff *skb)
36 {
37 void *data_end = (void *)(long) skb->data_end;
38 void *data = (void *)(long) skb->data;
39 __u32 lport = skb->local_port;
40 __u32 rport = skb->remote_port;
41 __u8 *d = data;
42 __u8 sk, map;
43
44 __sink(lport);
45 __sink(rport);
46
47 if (data + 8 > data_end)
48 return SK_DROP;
49
50 map = d[0];
51 sk = d[1];
52
53 d[0] = 0xd;
54 d[1] = 0xe;
55 d[2] = 0xa;
56 d[3] = 0xd;
57 d[4] = 0xb;
58 d[5] = 0xe;
59 d[6] = 0xe;
60 d[7] = 0xf;
61
62 if (!map)
63 return bpf_sk_redirect_map(skb, &sock_map_rx, sk, 0);
64 return bpf_sk_redirect_map(skb, &sock_map_tx, sk, 0);
65 }
66
67 char _license[] SEC("license") = "GPL";
68