[PATCH wireless 05/10] wifi: mac80211: don't offload TC setup on AP_VLAN interfaces

From: Johannes Berg <redacted>

AP_VLAN interfaces are purely virtual, so don't try to offload
TC setup to drivers. We can't really use the AP interface either
since we may not know it all the time, and it could technically
even change.

Just reject the TC offload so things get done in software.

Assisted-by: LLM
Fixes: 61587f1556fe ("wifi: mac80211: add support for letting drivers register tc offload support")
Reported-by: syzbot+f1ba58d6b55abd13239e@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=f1ba58d6b55abd13239e
Signed-off-by: Johannes Berg <redacted>
---
 net/mac80211/iface.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 43460a705a6b..8c300e045fdf 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c

@@ -935,6 +935,9 @@ static int ieee80211_netdev_setup_tc(struct net_device *dev,
 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 	struct ieee80211_local *local = sdata->local;
 
+	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
+		return -EOPNOTSUPP;
+
 	return drv_net_setup_tc(local, sdata, dev, type, type_data);
 }
 

-- 
2.55.0