Laravel controller validator

RegisterController.php

<?php

class RegisterController extends BaseController {

	protected $layout = 'layouts.master';
	
		
	//post
	public function post_index(){
		$validation = new Services\Validators\Step1;
		
		if ($validation->passes()){
			$this->create_session_values(Input::all());
			$this->save_registration('dealer_user');
		}
		
		return Redirect::back()->withInput()->withErrors($validation->errors);
	}	
	
}