netdev - [PATCH AUTOSEL 6.1 08/35] mac80211: Fix MLO address translation for multiple bss case

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Date:   Tue, 24 Jan 2023 08:41:04 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Sriram R <quic_srirrama@...cinc.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Sasha Levin <sashal@...nel.org>, johannes@...solutions.net,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 08/35] mac80211: Fix MLO address translation for multiple bss case

From: Sriram R <quic_srirrama@...cinc.com>

[ Upstream commit fa22b51ace8aa106267636f36170e940e676809c ]

When multiple interfaces are present in the local interface
list, new skb copy is taken before rx processing except for
the first interface. The address translation happens each
time only on the original skb since the hdr pointer is not
updated properly to the newly created skb.

As a result frames start to drop in userspace when address
based checks or search fails.

Signed-off-by: Sriram R <quic_srirrama@...cinc.com>
Link: https://lore.kernel.org/r/20221208040050.25922-1-quic_srirrama@quicinc.com
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/mac80211/rx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index f99416d2e144..60b83cbbd5b0 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -4859,6 +4859,9 @@ static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
 		 */
 		shwt = skb_hwtstamps(rx->skb);
 		shwt->hwtstamp = skb_hwtstamps(skb)->hwtstamp;
+
+		/* Update the hdr pointer to the new skb for translation below */
+		hdr = (struct ieee80211_hdr *)rx->skb->data;
 	}
 
 	if (unlikely(link_sta)) {
-- 
2.39.0