[PATCHv2 1/1] mac80211: fix WPA with VLAN on AP side with ps-sta

[Michael Braun <michael-dev@fami-braun.de>]

When sending a broadcast while at least on of the connected stations is
sleeping, it gets queued and send after a DTIM beacon is sent.
If the packet was to be sent on a vlan interface, the vif used for dequeing
from the per-bss queue does not hold the per-vlan sdata. The correct sdata is
required to use the correct per-vlan broadcast/multicast key.

This patch fixes this by restoring the per-vlan sdata using the skb->dev entry.

Signed-off-by: Michael Braun <michael-dev@fami-braun.de>

V2: fix compile warning
---
 net/mac80211/tx.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 2ef0e19..583c025 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -2728,6 +2728,7 @@ ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
 	struct ps_data *ps;
 	struct ieee80211_tx_info *info;
 	struct ieee80211_chanctx_conf *chanctx_conf;
+	struct ieee80211_sub_if_data *frame_sdata;
 
 	sdata = vif_to_sdata(vif);
 
@@ -2770,7 +2771,8 @@ ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
 				cpu_to_le16(IEEE80211_FCTL_MOREDATA);
 		}
 
-		if (!ieee80211_tx_prepare(sdata, &tx, skb))
+		frame_sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
+		if (!ieee80211_tx_prepare(frame_sdata, &tx, skb))
 			break;
 		dev_kfree_skb_any(skb);
 	}
-- 
1.7.10.4