PHP - LOGIN CODEIGNITER

<?php

defined('BASEPATH') OR exit('No direct script access allowed');

class Dashboard extends CI_Controller {

public function logar(){

		$email = $this->input->post('email');

		$contrasena = md5($this->input->post('contrasena'));

		$this->db->where('email',$email);

		$this->db->where('contrasena',$contrasena);

		$this->db->where('estado',1);

		$data['usuario'] = $this->db->get('usuario')->result();

		if (count($data['usuario'])==1) {

		 	$dados['nombre'] = $data['usuario'][0]->nombre;

		 	$dados['id'] = $data['usuario'][0]->IdUsuario;

		 	$dados['logueado'] = true;

		 	$this->session->set_userdata($dados);

			echo $this->session->userdata('email');

		 	redirect('dashboard');

		 } else{

		 		redirect('dashboard/login');

		 }

	}

}

<div class="form-group">

	<div class="input-group">

		<span class="input-group-addon">

			<i class="glyphicon glyphicon-user"></i>

		</span>

		<input type="email" id="inputEmail" class="form-control" placeholder="Ingrese Email" name='email' autofocus required>

	</div>

</div>

<div class="form-group">

	<div class="input-group">

		<span class="input-group-addon">

			<i class="glyphicon glyphicon-lock"></i>

		</span>

		<input class="form-control" id="inputPassword" placeholder="Contraseña" name='contrasena' type="password" required>

	</div>

</div>

<nav class="navbar navbar-inverse navbar-fixed-top" role="navigation">

      <div class="container-fluid">

        <div class="navbar-header">

          <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">

            <span class="sr-only">Toggle navigation</span>

            <span class="icon-bar"></span>

            <span class="icon-bar"></span>

            <span class="icon-bar"></span>

          </button>

          <a class="navbar-brand" href="#" >Sistema de Usuarios - GUE RICARDO PAMA  - Bienvenidos </a>

        </div>

        <div class="navbar-collapse collapse">

          <ul class="nav navbar-nav navbar-right">

            <li><a href="#">Configuracion</a></li>

            <li><a href="#">Perfil</a></li>

            <li><a href="<?= base_url()?>dashboard/cerrar_sesion">Logoaut</a></li>

<li><?php echo $this->session->userdata('email'); ?></li>

          </ul>

          <form class="navbar-form navbar-right">

            <input type="text" class="form-control" placeholder="Buscar...">

          </form>

        </div>

      </div>

</nav>