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 27bb23c0e1SLorenz Bauer SEC("classifier/copy_sock_map") 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"; 49