linux-kernel - [PATCH V4 4/4] mac80211: don't allow CSA on non-transmitting interfaces

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Date:   Fri,  9 Oct 2020 12:13:17 +0200
From:   John Crispin <john@...ozen.org>
To:     Johannes Berg <johannes@...solutions.net>
Cc:     linux-kernel@...r.kernel.org, John Crispin <john@...ozen.org>,
        Aloka Dixit <alokad@...eaurora.org>
Subject: [PATCH V4 4/4] mac80211: don't allow CSA on non-transmitting interfaces

As a non-transmitting interface does not broadcast a beacon, we do not want
to allow channel switch announcements. They need to be triggered on the
transmitting interface.

Signed-off-by: Aloka Dixit <alokad@...eaurora.org>
Signed-off-by: John Crispin <john@...ozen.org>
---
 net/mac80211/cfg.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 11cecb2ed640..7693894c4f84 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -3504,6 +3504,9 @@ __ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
 	if (sdata->vif.csa_active)
 		return -EBUSY;
 
+	if (sdata->vif.multiple_bssid.flags & IEEE80211_VIF_MBSS_NON_TRANSMITTING)
+		return -EINVAL;
+
 	mutex_lock(&local->chanctx_mtx);
 	conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
 					 lockdep_is_held(&local->chanctx_mtx));
-- 
2.25.1