1// SPDX-License-Identifier: GPL-2.0
2// Copyright (c) 2020 Cloudflare
3#include "vmlinux.h"
4#include <bpf/bpf_helpers.h>
5
6struct {
7	__uint(type, BPF_MAP_TYPE_SOCKMAP);
8	__uint(max_entries, 1);
9	__type(key, __u32);
10	__type(value, __u64);
11} src SEC(".maps");
12
13struct {
14	__uint(type, BPF_MAP_TYPE_SOCKMAP);
15	__uint(max_entries, 1);
16	__type(key, __u32);
17	__type(value, __u64);
18} dst_sock_map SEC(".maps");
19
20struct {
21	__uint(type, BPF_MAP_TYPE_SOCKHASH);
22	__uint(max_entries, 1);
23	__type(key, __u32);
24	__type(value, __u64);
25} dst_sock_hash SEC(".maps");
26
27SEC("tc")
28int copy_sock_map(void *ctx)
29{
30	struct bpf_sock *sk;
31	bool failed = false;
32	__u32 key = 0;
33
34	sk = bpf_map_lookup_elem(&src, &key);
35	if (!sk)
36		return SK_DROP;
37
38	if (bpf_map_update_elem(&dst_sock_map, &key, sk, 0))
39		failed = true;
40
41	if (bpf_map_update_elem(&dst_sock_hash, &key, sk, 0))
42		failed = true;
43
44	bpf_sk_release(sk);
45	return failed ? SK_DROP : SK_PASS;
46}
47
48char _license[] SEC("license") = "GPL";
49