wifi: mac80211: fix receiving mesh packets in forwarding=0 networks

When forwarding is set to 0, frames are typically sent with ttl=1.
Move the ttl decrement check below the check for local receive in order to
fix packet drops.

Reported-by: Thomas Hühn <thomas.huehn@hs-nordhausen.de>
Reported-by: Nick Hainke <vincent@systemli.org>
Fixes: 986e43b ("wifi: mac80211: fix receiving A-MSDU frames on mesh interfaces")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20230326151709.17743-1-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Author: nbd168

net/mac80211/rx.c

@@ -2769,14 +2769,6 @@ ieee80211_rx_mesh_data(struct ieee80211_sub_if_data *sdata, struct sta_info *sta
 	if (sdata->crypto_tx_tailroom_needed_cnt)
 		tailroom = IEEE80211_ENCRYPT_TAILROOM;
 
-	if (!--mesh_hdr->ttl) {
-		if (multicast)
-			goto rx_accept;
-
-		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
-		return RX_DROP_MONITOR;
-	}
-
 	if (mesh_hdr->flags & MESH_FLAGS_AE) {
 		struct mesh_path *mppath;
 		char *proxied_addr;
@@ -2807,6 +2799,14 @@ ieee80211_rx_mesh_data(struct ieee80211_sub_if_data *sdata, struct sta_info *sta
 	if (ether_addr_equal(sdata->vif.addr, eth->h_dest))
 		goto rx_accept;
 
+	if (!--mesh_hdr->ttl) {
+		if (multicast)
+			goto rx_accept;
+
+		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
+		return RX_DROP_MONITOR;
+	}
+
 	if (!ifmsh->mshcfg.dot11MeshForwarding) {
 		if (is_multicast_ether_addr(eth->h_dest))
 			goto rx_accept;