A SDIO-Interface Wi-Fi Packet Capture Scheme Based on Android Kernel Extension

Abstract

Wi-Fi network packet capturing techniques are used to examine and capture real-time running packets, is a crucial step to analyze and evolve communication protocols. On most mobile phones based on Android system, FullMAC Wi-Fi chips are used in WLAN subsystem, and the secure digital input output (SDIO) interface is used between Wi-Fi chip and host driver. Most Wi-Fi capture tools are not suitable in this scenarios. Hence, in this paper, we propose a SDIO interface Wi-Fi Network packet capture tool based on Android kernel extension. Our work focuses on analyzing implementation mechanism of SDIO interface in Android kernel, and proposing the modification scheme to implement packet capture work. This scheme is useful in most different Wi-Fi networks. We use our tool to perform packet capturing and analyzing experiment in Wi-Fi direct network. Based on our work, we can also modify the Wi-Fi network packet and propose new medium access control layer protocols.