WiFu is a user-level toolkit for developing transport protocols, with an emphasis on wireless networks. WiFu consists of two parts:

1. WiFu Transport for end-to-end protocol design. WiFu Transport protocols are based on components, allowing researchers to easily plug-and-play with new designs. For example, you could pull out TCP's window-based congestion control algorithm and replace it with rate-based congestion control. Likewise, you could remove TCP's ACK-based reliability and replace it with FEC.

2. WiFu Core for cross-layer design. WiFu Core allows packets to be intercepted and modified on a per-hop basis. For example, you could implement per-hop retransmission for lossy networks.

• Flexibility: Protocols are built out of components, so it is easy to plug-and-play with new reliability or congestion control protocols

• Code Reuse: WiFu comes with event handling, timers, packet formats, and other functionality so you get the convenience of a simulator with the reality of an implementation

• Performance: WiFu TCP is as fast as the kernel in wireless networks and on 100 Mbps Ethernet, while having identical fairness among flows

• Easy Porting: WiFu implements the standard BSD socket API, so it is simple to port any application for use with WiFu

• Network Debugging: WiFu comes with a mock network object and Wireshark packet traces, greatly simplifying the process of debugging a network protocol

• Scalability: Support for multiple applications, built with threading, written entirely in C++

• Randy Buck, Rich Lee, Philip Lundrigan, and Daniel Zappala. WiFu: A Composable Toolkit for Experimental Wireless Transport Protocols. In IEEE Ninth International Conference on Mobile Ad-Hoc and Sensor Systems, 2012.

• Randy Buck. WiFu Transport: A User-level Protocol Framework. M.S. Thesis, Brigham Young University, 2012.

• Xingang Zhang, Randy Buck, and Daniel Zappala. 2011. “Experimental Performance Evaluation of ATP in a Wireless Mesh Network.” In 2011 IEEE Eighth International Conference on Mobile Ad-Hoc and Sensor Systems, 122–131. IEEE. doi:http://dx.doi.org/10.1109/MASS.2011.25

This project is supported by the National Science Foundation under Grant No. 0917240.