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Ninth Real-Time Linux Workshop on November 2 to 4, 2007, in Linz, Austria

Prototyping User-Oriented Addressing Model in Linux Kernel

Maoke Chen, Taoyu Li, Dong Zhou and Xing Li

The emergence of slice-based computing model has raised high demand on replacing the interface-based addressing model with user-oriented addressing paradigm. Assigning IP addresses to users instead of interfaces or hosts help us to realize high-granularity controls on port resource utilization, identity authentication, and quality of service. However, this is not a very easy change. It is calling an innovation on the operating system design. In this paper, we propose a reference prototype implementation of Linux operating system, which enables the administrator to associate each user with a certain IPv6 (or IPv4) address and to limit that processes of a certain user can use that user's address only, to send or receive packets. The system prototype has been implemented via three major works. First, a data structure is added in the operating system to record the user-address correspondence information. Second, the socket library in the Linux kernel is modified in order that address usage permission is checked when process revokes connect, bind or sendmsg. Finally, a minimal set of administration tools has been developed so that the host administrator can configure the user-address correspondence according to necessity. Basic experiments have shown that the prototype is working well without significant performance degradation. We also would like to briefly discuss some controversy about user-oriented addressing model in this paper, but only the implementation level, but also in the context of architectural design.


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