Schulz, Matthias ; Wegemer, Daniel ; Hollick, Matthias (2017)
Nexmon: Build Your Own Wi-Fi Testbeds With Low-Level MAC and PHY-Access Using Firmware Patches on Off-the-Shelf Mobile Devices.
11th Workshop on Wireless Network Testbeds, Experimental Evaluation & CHaracterization. Snowbird, Utah, USA (20.10.2017-20.10.2017)
Konferenzveröffentlichung, Bibliographie
Kurzbeschreibung (Abstract)
The most widespread Wi-Fi enabled devices are smartphones. They are mobile, close to people and available in large quantities, which makes them perfect candidates for real-world wireless testbeds. Unfortunately, most smartphones contain closed-source FullMAC Wi-Fi chips that hinder the modification of lower-layer Wi-Fi mechanisms and the implementation of new algorithms. To enable researchers' access to lower-layer frame processing and advanced physical-layer functionalities on Broadcom Wi-Fi chips, we developed the Nexmon firmware patching framework. It allows users to create firmware modifications for embedded ARM processors using C code and to change the behavior of Broadcom's real-time processor using Assembly. Currently, our framework supports five Broadcom chips available in smartphones and Raspberry Pis. Our example patches enable monitor mode, frame injection, handling of ioctls, ucode compression and flashpatches. In a simple ping offloading example, we demonstrate how handling pings in firmware reduces power consumption by up to 165 mW and is nine times faster than in the kernel on a Nexus 5. Using Nexmon, researchers can unleash the full capabilities of off-the-shelf Wi-Fi devices.
| Typ des Eintrags: | Konferenzveröffentlichung |
|---|---|
| Erschienen: | 2017 |
| Autor(en): | Schulz, Matthias ; Wegemer, Daniel ; Hollick, Matthias |
| Art des Eintrags: | Bibliographie |
| Titel: | Nexmon: Build Your Own Wi-Fi Testbeds With Low-Level MAC and PHY-Access Using Firmware Patches on Off-the-Shelf Mobile Devices |
| Sprache: | Englisch |
| Publikationsjahr: | Oktober 2017 |
| Ort: | Snowbird, Utah, USA |
| Buchtitel: | Proceedings of the 11th Workshop on Wireless Network Testbeds, Experimental Evaluation & CHaracterization |
| Veranstaltungstitel: | 11th Workshop on Wireless Network Testbeds, Experimental Evaluation & CHaracterization |
| Veranstaltungsort: | Snowbird, Utah, USA |
| Veranstaltungsdatum: | 20.10.2017-20.10.2017 |
| URL / URN: | https://doi.org/10.1145/3131473.3131476 |
| Kurzbeschreibung (Abstract): | The most widespread Wi-Fi enabled devices are smartphones. They are mobile, close to people and available in large quantities, which makes them perfect candidates for real-world wireless testbeds. Unfortunately, most smartphones contain closed-source FullMAC Wi-Fi chips that hinder the modification of lower-layer Wi-Fi mechanisms and the implementation of new algorithms. To enable researchers' access to lower-layer frame processing and advanced physical-layer functionalities on Broadcom Wi-Fi chips, we developed the Nexmon firmware patching framework. It allows users to create firmware modifications for embedded ARM processors using C code and to change the behavior of Broadcom's real-time processor using Assembly. Currently, our framework supports five Broadcom chips available in smartphones and Raspberry Pis. Our example patches enable monitor mode, frame injection, handling of ioctls, ucode compression and flashpatches. In a simple ping offloading example, we demonstrate how handling pings in firmware reduces power consumption by up to 165 mW and is nine times faster than in the kernel on a Nexus 5. Using Nexmon, researchers can unleash the full capabilities of off-the-shelf Wi-Fi devices. |
| Freie Schlagworte: | Nexmon, broadcom, wi-fi, firmware reverse engineering |
| ID-Nummer: | TUD-CS-2017-0207 |
| Fachbereich(e)/-gebiet(e): | 20 Fachbereich Informatik 20 Fachbereich Informatik > Sichere Mobile Netze DFG-Sonderforschungsbereiche (inkl. Transregio) DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche Profilbereiche Profilbereiche > Cybersicherheit (CYSEC) LOEWE LOEWE > LOEWE-Schwerpunkte LOEWE > LOEWE-Schwerpunkte > NICER – Vernetzte infrastrukturlose Kooperation zur Krisenbewältigung LOEWE > LOEWE-Zentren LOEWE > LOEWE-Zentren > CASED – Center for Advanced Security Research Darmstadt DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 1053: MAKI – Multi-Mechanismen-Adaption für das künftige Internet DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 1053: MAKI – Multi-Mechanismen-Adaption für das künftige Internet > A: Konstruktionsmethodik DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 1053: MAKI – Multi-Mechanismen-Adaption für das künftige Internet > A: Konstruktionsmethodik > Teilprojekt A1: Modellierung DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 1053: MAKI – Multi-Mechanismen-Adaption für das künftige Internet > A: Konstruktionsmethodik > Teilprojekt A3: Migration |
| Hinterlegungsdatum: | 02 Aug 2017 14:10 |
| Letzte Änderung: | 02 Jul 2024 10:05 |
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