From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-io0-f179.google.com ([209.85.223.179]:33036 "EHLO mail-io0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756450AbbLAV74 (ORCPT ); Tue, 1 Dec 2015 16:59:56 -0500 Received: by iouu10 with SMTP id u10so25875805iou.0 for ; Tue, 01 Dec 2015 13:59:55 -0800 (PST) MIME-Version: 1.0 Date: Tue, 1 Dec 2015 13:59:55 -0800 Message-ID: (sfid-20151201_225959_079001_7630D8E2) Subject: MAC address randomization support From: Anatol Pomozov To: "Greenman, Gregory" , "Berg, Johannes" , linux-wireless@vger.kernel.org, "Grumbach, Emmanuel" Content-Type: text/plain; charset=UTF-8 Sender: linux-wireless-owner@vger.kernel.org List-ID: Hi At ChromeOS we are looking at utilizing MAC address randomization. There are some ChromeOS use-cases where it can be useful. I checked upstream kernel and Android source code to understand the current state of this feature. This feature is supported in Android and a few products use it already for Preferred Network Offload scan. There is a HAL method that allows to set MAC OUI [1] that makes 3 first octets predefined and the rest of MAC address is randomized. Kernel passes this OUI value to firmware where the randomization is implemented. I checked current upstream kernel and did not find any API for enabling/dealing with MAC address randomization. If a firmware devs want to add the feature easily then there should be some standard API for enabling/configuring MAC randomization. In fact there is one mention of the feature in upstream source tree - macaddr_* fields in "struct iwl_tof_range_req_cmd" of iwlwifi driver. It allows to enable/disable randomization for 11MC measurement. The MAC randomization could be used by other drivers for many use-cases and I think it worth making it a part of standard cfg80211 API. Is it something maintainers are interested in? Does anybody work on it already? [1] https://android.googlesource.com/platform/hardware/libhardware_legacy/+/master/include/hardware_legacy/wifi_hal.h