Multipath resilient routing for endogenous secure software defined networks

摘要

SDN improves the flexibility and programmability of the network. However, malicious attacks caused by potential vulnerabilities and backdoors can easily lead to data and rule tampering in the network. To address this problem, this paper proposes an endogenous secure SDN network framework based on multipath resilient routing (MRR). MRR includes multipath comparing forwarding, multipath weighted forwarding, and multipath random forwarding. The framework ensures the correctness of flow rules and data content by dynamically comparing the consistency of multi-heterogeneous path data within a certain period, and multipath can also achieve load balance by weighted forwarding. In the MRR framework, we also present an intermediate information feedback mechanism based on encryption authentication and give a mathematical model to evaluate it. This mechanism can accurately identify and dynamically repair malicious switches. Simulation evaluation and prototype system test show that this framework can achieve high accuracy of flow transmission and high availability of system. At the same time, multipath comparing forwarding will bring some performance costs such as delay, bandwidth, and jitter at initial and attacking time. However, when the appropriate forwarding mode and reasonable period T are selected, the proportion of delay introduced by comparing and ruling can be less than 10%, and the average bandwidth of mixed forwarding is almost the same as traditional multipaths', such as we can guarantee 25% multipath comparing forwarding when the bandwidth requirement is 250 M in prototype system.