Training courses

Kernel and Embedded Linux

Bootlin training courses

Embedded Linux, kernel,
Yocto Project, Buildroot, real-time,
graphics, boot time, debugging...

Bootlin logo

Elixir Cross Referencer

Open Menu /tools/testing/selftests/bpf/progs/sockmap_verdict_prog.c 
 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";