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nl80211: add scan features for improved scan privacy
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>
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@ -5133,6 +5133,11 @@ enum nl80211_feature_flags {
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* support to nl80211.
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* @NL80211_EXT_FEATURE_TXQS: Driver supports FQ-CoDel-enabled intermediate
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* TXQs.
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* @NL80211_EXT_FEATURE_SCAN_RANDOM_SN: Driver/device supports randomizing the
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* SN in probe request frames if requested by %NL80211_SCAN_FLAG_RANDOM_SN.
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* @NL80211_EXT_FEATURE_SCAN_MIN_PREQ_CONTENT: Driver/device can omit all data
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* except for supported rates from the probe request content if requested
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* by the %NL80211_SCAN_FLAG_MIN_PREQ_CONTENT flag.
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*
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* @NUM_NL80211_EXT_FEATURES: number of extended features.
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* @MAX_NL80211_EXT_FEATURES: highest extended feature index.
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@ -5167,6 +5172,8 @@ enum nl80211_ext_feature_index {
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NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211,
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NL80211_EXT_FEATURE_DATA_ACK_SIGNAL_SUPPORT,
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NL80211_EXT_FEATURE_TXQS,
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NL80211_EXT_FEATURE_SCAN_RANDOM_SN,
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NL80211_EXT_FEATURE_SCAN_MIN_PREQ_CONTENT,
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/* add new features before the definition below */
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NUM_NL80211_EXT_FEATURES,
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@ -5272,6 +5279,12 @@ enum nl80211_timeout_reason {
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* possible scan results. This flag hints the driver to use the best
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* possible scan configuration to improve the accuracy in scanning.
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* Latency and power use may get impacted with this flag.
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* @NL80211_SCAN_FLAG_RANDOM_SN: randomize the sequence number in probe
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* request frames from this scan to avoid correlation/tracking being
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* possible.
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* @NL80211_SCAN_FLAG_MIN_PREQ_CONTENT: minimize probe request content to
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* only have supported rates and no additional capabilities (unless
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* added by userspace explicitly.)
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*/
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enum nl80211_scan_flags {
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NL80211_SCAN_FLAG_LOW_PRIORITY = 1<<0,
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@ -5285,6 +5298,8 @@ enum nl80211_scan_flags {
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NL80211_SCAN_FLAG_LOW_SPAN = 1<<8,
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NL80211_SCAN_FLAG_LOW_POWER = 1<<9,
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NL80211_SCAN_FLAG_HIGH_ACCURACY = 1<<10,
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NL80211_SCAN_FLAG_RANDOM_SN = 1<<11,
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NL80211_SCAN_FLAG_MIN_PREQ_CONTENT = 1<<12,
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};
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/**
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@ -6925,7 +6925,13 @@ nl80211_check_scan_flags(struct wiphy *wiphy, struct wireless_dev *wdev,
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NL80211_EXT_FEATURE_OCE_PROBE_REQ_DEFERRAL_SUPPRESSION) ||
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!nl80211_check_scan_feat(wiphy, *flags,
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NL80211_SCAN_FLAG_OCE_PROBE_REQ_HIGH_TX_RATE,
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NL80211_EXT_FEATURE_OCE_PROBE_REQ_HIGH_TX_RATE))
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NL80211_EXT_FEATURE_OCE_PROBE_REQ_HIGH_TX_RATE) ||
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!nl80211_check_scan_feat(wiphy, *flags,
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NL80211_SCAN_FLAG_RANDOM_SN,
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NL80211_EXT_FEATURE_SCAN_RANDOM_SN) ||
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!nl80211_check_scan_feat(wiphy, *flags,
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NL80211_SCAN_FLAG_MIN_PREQ_CONTENT,
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NL80211_EXT_FEATURE_SCAN_MIN_PREQ_CONTENT))
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return -EOPNOTSUPP;
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if (*flags & NL80211_SCAN_FLAG_RANDOM_ADDR) {
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