From:   Felix Fietkau <nbd@nbd.name>
To:     linux-wireless@vger.kernel.org
Cc:     johannes@sipsolutions.net, Ryder Lee <ryder.lee@mediatek.com>
Subject: [PATCH 3/7] wifi: mac80211: fix mesh path discovery based on unicast packets
Date:   Tue, 14 Mar 2023 10:59:52 +0100
Message-Id: <20230314095956.62085-3-nbd@nbd.name>
In-Reply-To: <20230314095956.62085-1-nbd@nbd.name>
References: <20230314095956.62085-1-nbd@nbd.name>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

If a packet has reached its intended destination, it was bumped to the code
that accepts it, without first checking if a mesh_path needs to be created
based on the discovered source.
Fix this by moving the destination address check further down

Fixes: 986e43b19ae9 ("wifi: mac80211: fix receiving A-MSDU frames on mesh interfaces")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 net/mac80211/rx.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 0255c5745e1c..7a37ada70684 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -2746,17 +2746,6 @@ ieee80211_rx_mesh_data(struct ieee80211_sub_if_data *sdata, struct sta_info *sta
 	    mesh_rmc_check(sdata, eth->h_source, mesh_hdr))
 		return RX_DROP_MONITOR;
 
-	/* Frame has reached destination.  Don't forward */
-	if (ether_addr_equal(sdata->vif.addr, eth->h_dest))
-		goto rx_accept;
-
-	if (!ifmsh->mshcfg.dot11MeshForwarding) {
-		if (is_multicast_ether_addr(eth->h_dest))
-			goto rx_accept;
-
-		return RX_DROP_MONITOR;
-	}
-
 	/* forward packet */
 	if (sdata->crypto_tx_tailroom_needed_cnt)
 		tailroom = IEEE80211_ENCRYPT_TAILROOM;
@@ -2795,6 +2784,17 @@ ieee80211_rx_mesh_data(struct ieee80211_sub_if_data *sdata, struct sta_info *sta
 		rcu_read_unlock();
 	}
 
+	/* Frame has reached destination.  Don't forward */
+	if (ether_addr_equal(sdata->vif.addr, eth->h_dest))
+		goto rx_accept;
+
+	if (!ifmsh->mshcfg.dot11MeshForwarding) {
+		if (is_multicast_ether_addr(eth->h_dest))
+			goto rx_accept;
+
+		return RX_DROP_MONITOR;
+	}
+
 	skb_set_queue_mapping(skb, ieee802_1d_to_ac[skb->priority]);
 
 	ieee80211_fill_mesh_addresses(&hdr, &hdr.frame_control,
-- 
2.39.0