49 lines
985 B
C
49 lines
985 B
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2020 Cloudflare
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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struct {
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__uint(type, BPF_MAP_TYPE_SOCKMAP);
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__uint(max_entries, 1);
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__type(key, __u32);
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__type(value, __u64);
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} src SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_SOCKMAP);
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__uint(max_entries, 1);
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__type(key, __u32);
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__type(value, __u64);
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} dst_sock_map SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_SOCKHASH);
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__uint(max_entries, 1);
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__type(key, __u32);
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__type(value, __u64);
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} dst_sock_hash SEC(".maps");
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SEC("classifier/copy_sock_map")
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int copy_sock_map(void *ctx)
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{
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struct bpf_sock *sk;
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bool failed = false;
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__u32 key = 0;
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sk = bpf_map_lookup_elem(&src, &key);
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if (!sk)
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return SK_DROP;
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if (bpf_map_update_elem(&dst_sock_map, &key, sk, 0))
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failed = true;
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if (bpf_map_update_elem(&dst_sock_hash, &key, sk, 0))
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failed = true;
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bpf_sk_release(sk);
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return failed ? SK_DROP : SK_PASS;
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}
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char _license[] SEC("license") = "GPL";
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