public function validateAttribute($model, $attribute)
{
$value = $model->{$attribute};
$result = $this->validateSubnet($value);
if (is_array($result)) {
$result[1] = array_merge(['ip' => is_array($value) ? 'array()' : $value], $result[1]);
$this->addError($model, $attribute, $result[0], $result[1]);
} else {
$model->{$attribute} = $result;
}
}