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