summaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/bpf/progs/test_tc_peer.c
blob: fc84a7685aa2cc3b35a5a7e5a94896e3913d0117 (plain)
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
// SPDX-License-Identifier: GPL-2.0
#include <stdint.h>
#include <stdbool.h>

#include <linux/bpf.h>
#include <linux/stddef.h>
#include <linux/pkt_cls.h>

#include <bpf/bpf_helpers.h>

enum {
	dev_src,
	dev_dst,
};

struct bpf_map_def SEC("maps") ifindex_map = {
	.type		= BPF_MAP_TYPE_ARRAY,
	.key_size	= sizeof(int),
	.value_size	= sizeof(int),
	.max_entries	= 2,
};

static __always_inline int get_dev_ifindex(int which)
{
	int *ifindex = bpf_map_lookup_elem(&ifindex_map, &which);

	return ifindex ? *ifindex : 0;
}

SEC("chk_egress") int tc_chk(struct __sk_buff *skb)
{
	return TC_ACT_SHOT;
}

SEC("dst_ingress") int tc_dst(struct __sk_buff *skb)
{
	return bpf_redirect_peer(get_dev_ifindex(dev_src), 0);
}

SEC("src_ingress") int tc_src(struct __sk_buff *skb)
{
	return bpf_redirect_peer(get_dev_ifindex(dev_dst), 0);
}

char __license[] SEC("license") = "GPL";