You do realize that Flash and Shockwave are 2 different things right?
From the Macromedia website:
The Macromedia Flash Player and the Shockwave Player are both free web players from Macromedia. Each has a distinct purpose:
* The Macromedia Flash Player displays content created with Macromedia Flash such as web application front-ends, high-impact website user interfaces, interactive online advertising, and short-form to long-form animation.
* The Shockwave Player displays content created with Macromedia Director such as high-performance multi-user games, interactive 3D product simulations, online entertainment, and training applications. By using Xtra extensions, developers can extend the capabilities of the Shockwave Player to play back custom-built applications.
If there is a Shockwave/Linux plugin I am not aware of one. There is always posts here of people looking for one, and a few petitions to get Macromedia to develop one.