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From:   Markus Theil <markus.theil@tu-ilmenau.de>
To:     johannes@sipsolutions.net
Cc:     linux-wireless@vger.kernel.org, nbd@nbd.name, lorenzo@kernel.org,
        Markus Theil <markus.theil@tu-ilmenau.de>
Subject: [PATCH 1/3] nl80211: add monitor mode scan feature
Date:   Tue,  3 Mar 2020 12:50:15 +0100
Message-Id: <20200303115017.9845-1-markus.theil@tu-ilmenau.de>
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Back in 2007 "mac80211: don't allow scanning in monitor mode"
(f27b62d3e7ec) disabled scanning in monitor mode, because hw
controlled by the zd1211rw driver got confused during this operation.

Nevertheless, it can be useful to scan in monitor mode, e.g.
when building a tool which processes scans, channel surveys and
monitors the channel passively in monitor mode.

This patch adds a feature flag for scanning in monitor mode,
which can be set by hw supporting this feature.

Signed-off-by: Markus Theil <markus.theil@tu-ilmenau.de>
---
 include/uapi/linux/nl80211.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index b002ef2060fa..062519967e60 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -5642,6 +5642,9 @@ enum nl80211_feature_flags {
  * @NL80211_EXT_FEATURE_BEACON_PROTECTION: The driver supports Beacon protection
  *	and can receive key configuration for BIGTK using key indexes 6 and 7.
  *
+ * @NL80211_EXT_FEATURE_MONITOR_MODE_SCAN: The driver supports scanning while in
+ *	monitor mode.
+ *
  * @NUM_NL80211_EXT_FEATURES: number of extended features.
  * @MAX_NL80211_EXT_FEATURES: highest extended feature index.
  */
@@ -5690,6 +5693,7 @@ enum nl80211_ext_feature_index {
 	NL80211_EXT_FEATURE_VLAN_OFFLOAD,
 	NL80211_EXT_FEATURE_AQL,
 	NL80211_EXT_FEATURE_BEACON_PROTECTION,
+	NL80211_EXT_FEATURE_MONITOR_MODE_SCAN,
 
 	/* add new features before the definition below */
 	NUM_NL80211_EXT_FEATURES,
-- 
2.25.1