1bb23c0e1SLorenz Bauer // SPDX-License-Identifier: GPL-2.0
2bb23c0e1SLorenz Bauer // Copyright (c) 2020 Cloudflare
3bb23c0e1SLorenz Bauer #include "vmlinux.h"
4bb23c0e1SLorenz Bauer #include <bpf/bpf_helpers.h>
5bb23c0e1SLorenz Bauer
6bb23c0e1SLorenz Bauer struct {
7bb23c0e1SLorenz Bauer __uint(type, BPF_MAP_TYPE_SOCKMAP);
8bb23c0e1SLorenz Bauer __uint(max_entries, 1);
9bb23c0e1SLorenz Bauer __type(key, __u32);
10bb23c0e1SLorenz Bauer __type(value, __u64);
11bb23c0e1SLorenz Bauer } src SEC(".maps");
12bb23c0e1SLorenz Bauer
13bb23c0e1SLorenz Bauer struct {
14bb23c0e1SLorenz Bauer __uint(type, BPF_MAP_TYPE_SOCKMAP);
15bb23c0e1SLorenz Bauer __uint(max_entries, 1);
16bb23c0e1SLorenz Bauer __type(key, __u32);
17bb23c0e1SLorenz Bauer __type(value, __u64);
18bb23c0e1SLorenz Bauer } dst_sock_map SEC(".maps");
19bb23c0e1SLorenz Bauer
20bb23c0e1SLorenz Bauer struct {
21bb23c0e1SLorenz Bauer __uint(type, BPF_MAP_TYPE_SOCKHASH);
22bb23c0e1SLorenz Bauer __uint(max_entries, 1);
23bb23c0e1SLorenz Bauer __type(key, __u32);
24bb23c0e1SLorenz Bauer __type(value, __u64);
25bb23c0e1SLorenz Bauer } dst_sock_hash SEC(".maps");
26bb23c0e1SLorenz Bauer
27*c22bdd28SAndrii Nakryiko SEC("tc")
copy_sock_map(void * ctx)28bb23c0e1SLorenz Bauer int copy_sock_map(void *ctx)
29bb23c0e1SLorenz Bauer {
30bb23c0e1SLorenz Bauer struct bpf_sock *sk;
31bb23c0e1SLorenz Bauer bool failed = false;
32bb23c0e1SLorenz Bauer __u32 key = 0;
33bb23c0e1SLorenz Bauer
34bb23c0e1SLorenz Bauer sk = bpf_map_lookup_elem(&src, &key);
35bb23c0e1SLorenz Bauer if (!sk)
36bb23c0e1SLorenz Bauer return SK_DROP;
37bb23c0e1SLorenz Bauer
38bb23c0e1SLorenz Bauer if (bpf_map_update_elem(&dst_sock_map, &key, sk, 0))
39bb23c0e1SLorenz Bauer failed = true;
40bb23c0e1SLorenz Bauer
41bb23c0e1SLorenz Bauer if (bpf_map_update_elem(&dst_sock_hash, &key, sk, 0))
42bb23c0e1SLorenz Bauer failed = true;
43bb23c0e1SLorenz Bauer
44bb23c0e1SLorenz Bauer bpf_sk_release(sk);
45bb23c0e1SLorenz Bauer return failed ? SK_DROP : SK_PASS;
46bb23c0e1SLorenz Bauer }
47bb23c0e1SLorenz Bauer
48bb23c0e1SLorenz Bauer char _license[] SEC("license") = "GPL";
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