66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
#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";
|