1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (c) 2020 Cloudflare 3 #include "vmlinux.h" 4 #include <bpf/bpf_helpers.h> 5 6 struct { 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 13 struct { 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 20 struct { 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 27 SEC("tc") 28 int 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 48 char _license[] SEC("license") = "GPL"; 49