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Tunnel inbound: Share the fake UDP reply socket address on OpenBSD #6624

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Tunnel inbound: Share the fake UDP reply socket address on OpenBSD #6624

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5 changes: 5 additions & 0 deletions proxy/dokodemo/fakeudp_openbsd.go
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Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,11 @@ func FakeUDP(addr *net.UDPAddr, mark int) (net.PacketConn, error) {
if err = unix.SetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_REUSEADDR, 1); err != nil {
return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("set socket option SO_REUSEADDR: %w", err)}
}
// Several client sessions can be answered from the same original
// destination at the same time, so the address has to be shareable.
if err = unix.SetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_REUSEPORT, 1); err != nil {
return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("set socket option SO_REUSEPORT: %w", err)}
}

sockaddr := &unix.SockaddrInet4{Port: addr.Port}
copy(sockaddr.Addr[:], ip4)
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