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nl80211: add scan features for improved scan privacy

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Add the scan flags for randomized SN and minimized probe request
content for improved scan privacy.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
This commit is contained in:
Johannes Berg 2018-05-28 15:47:40 +02:00 committed by Johannes Berg
parent 45ad683484
commit 2e076f1990
2 changed files with 22 additions and 1 deletions
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15
include/uapi/linux/nl80211.h
View File

@ -5133,6 +5133,11 @@ enum nl80211_feature_flags {
* support to nl80211.
* @NL80211_EXT_FEATURE_TXQS: Driver supports FQ-CoDel-enabled intermediate
* TXQs.
* @NL80211_EXT_FEATURE_SCAN_RANDOM_SN: Driver/device supports randomizing the
* SN in probe request frames if requested by %NL80211_SCAN_FLAG_RANDOM_SN.
* @NL80211_EXT_FEATURE_SCAN_MIN_PREQ_CONTENT: Driver/device can omit all data
* except for supported rates from the probe request content if requested
* by the %NL80211_SCAN_FLAG_MIN_PREQ_CONTENT flag.
*
* @NUM_NL80211_EXT_FEATURES: number of extended features.
* @MAX_NL80211_EXT_FEATURES: highest extended feature index.
@ -5167,6 +5172,8 @@ enum nl80211_ext_feature_index {
NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211,
NL80211_EXT_FEATURE_DATA_ACK_SIGNAL_SUPPORT,
NL80211_EXT_FEATURE_TXQS,
NL80211_EXT_FEATURE_SCAN_RANDOM_SN,
NL80211_EXT_FEATURE_SCAN_MIN_PREQ_CONTENT,
/* add new features before the definition below */
NUM_NL80211_EXT_FEATURES,
@ -5272,6 +5279,12 @@ enum nl80211_timeout_reason {
* possible scan results. This flag hints the driver to use the best
* possible scan configuration to improve the accuracy in scanning.
* Latency and power use may get impacted with this flag.
* @NL80211_SCAN_FLAG_RANDOM_SN: randomize the sequence number in probe
* request frames from this scan to avoid correlation/tracking being
* possible.
* @NL80211_SCAN_FLAG_MIN_PREQ_CONTENT: minimize probe request content to
* only have supported rates and no additional capabilities (unless
* added by userspace explicitly.)
*/
enum nl80211_scan_flags {
NL80211_SCAN_FLAG_LOW_PRIORITY = 1<<0,
@ -5285,6 +5298,8 @@ enum nl80211_scan_flags {
NL80211_SCAN_FLAG_LOW_SPAN = 1<<8,
NL80211_SCAN_FLAG_LOW_POWER = 1<<9,
NL80211_SCAN_FLAG_HIGH_ACCURACY = 1<<10,
NL80211_SCAN_FLAG_RANDOM_SN = 1<<11,
NL80211_SCAN_FLAG_MIN_PREQ_CONTENT = 1<<12,
};
/**

8
net/wireless/nl80211.c
View File

@ -6925,7 +6925,13 @@ nl80211_check_scan_flags(struct wiphy *wiphy, struct wireless_dev *wdev,
NL80211_EXT_FEATURE_OCE_PROBE_REQ_DEFERRAL_SUPPRESSION) ||
!nl80211_check_scan_feat(wiphy, *flags,
NL80211_SCAN_FLAG_OCE_PROBE_REQ_HIGH_TX_RATE,
NL80211_EXT_FEATURE_OCE_PROBE_REQ_HIGH_TX_RATE))
NL80211_EXT_FEATURE_OCE_PROBE_REQ_HIGH_TX_RATE) ||
!nl80211_check_scan_feat(wiphy, *flags,
NL80211_SCAN_FLAG_RANDOM_SN,
NL80211_EXT_FEATURE_SCAN_RANDOM_SN) ||
!nl80211_check_scan_feat(wiphy, *flags,
NL80211_SCAN_FLAG_MIN_PREQ_CONTENT,
NL80211_EXT_FEATURE_SCAN_MIN_PREQ_CONTENT))
return -EOPNOTSUPP;
if (*flags & NL80211_SCAN_FLAG_RANDOM_ADDR) {