[PATCH 7/7] mac80211: add DFS support to monitor interface

[Victor Goldenshtein <victorg@ti.com>]

Stop dropping packets if we are on 'radar channel'
and the DFS is enabled/supported.

Signed-off-by: Victor Goldenshtein <victorg@ti.com>
---
 net/mac80211/tx.c |   14 ++++++++------
 1 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index e453212..b6a7cee 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1595,6 +1595,8 @@ netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
 	struct ieee80211_sub_if_data *tmp_sdata, *sdata;
 	u16 len_rthdr;
 	int hdrlen;
+	bool dfs_supported = !!(local->hw.wiphy->features &
+				NL80211_FEATURE_DFS);
 
 	/*
 	 * Frame injection is not allowed if beaconing is not allowed
@@ -1607,13 +1609,13 @@ netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
 	 * flag.
 	 *
 	 * Since AP mode uses monitor interfaces to inject/TX management
-	 * frames we can make AP mode the exception to this rule once it
-	 * supports radar detection as its implementation can deal with
-	 * radar detection by itself. We can do that later by adding a
-	 * monitor flag interfaces used for AP support.
+	 * frames we can make AP mode the exception to this rule, in the
+	 * case the driver supports radar detection, allow usage of radar
+	 * channels.
 	 */
-	if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
-	     IEEE80211_CHAN_PASSIVE_SCAN)))
+	if ((!(chan->flags & IEEE80211_CHAN_RADAR) || !dfs_supported) &&
+	    ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
+	    IEEE80211_CHAN_PASSIVE_SCAN))))
 		goto fail;
 
 	/* check for not even having the fixed radiotap header part */
-- 
1.7.5.4