Patch "mac80211: fix the update of path metric for RANN frame" has been added to the 3.18-stable tree

Patch "mac80211: fix the update of path metric for RANN frame" has been added to the 3.18-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    mac80211: fix the update of path metric for RANN frame

to the 3.18-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mac80211-fix-the-update-of-path-metric-for-rann-frame.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Feb  1 14:48:12 CET 2018
From: Chun-Yeow Yeoh <yeohchunyeow@gmail.com>
Date: Tue, 14 Nov 2017 23:20:05 +0800
Subject: mac80211: fix the update of path metric for RANN frame

From: Chun-Yeow Yeoh <yeohchunyeow@gmail.com>


[ Upstream commit fbbdad5edf0bb59786a51b94a9d006bc8c2da9a2 ]

The previous path metric update from RANN frame has not considered
the own link metric toward the transmitting mesh STA. Fix this.

Reported-by: Michael65535
Signed-off-by: Chun-Yeow Yeoh <yeohchunyeow@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/mac80211/mesh_hwmp.c |   15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

--- a/net/mac80211/mesh_hwmp.c
+++ b/net/mac80211/mesh_hwmp.c
@@ -763,7 +763,7 @@ static void hwmp_rann_frame_process(stru
 	struct mesh_path *mpath;
 	u8 ttl, flags, hopcount;
 	const u8 *orig_addr;
-	u32 orig_sn, metric, metric_txsta, interval;
+	u32 orig_sn, new_metric, orig_metric, last_hop_metric, interval;
 	bool root_is_gate;
 
 	ttl = rann->rann_ttl;
@@ -774,7 +774,7 @@ static void hwmp_rann_frame_process(stru
 	interval = le32_to_cpu(rann->rann_interval);
 	hopcount = rann->rann_hopcount;
 	hopcount++;
-	metric = le32_to_cpu(rann->rann_metric);
+	orig_metric = le32_to_cpu(rann->rann_metric);
 
 	/*  Ignore our own RANNs */
 	if (ether_addr_equal(orig_addr, sdata->vif.addr))
@@ -791,7 +791,10 @@ static void hwmp_rann_frame_process(stru
 		return;
 	}
 
-	metric_txsta = airtime_link_metric_get(local, sta);
+	last_hop_metric = airtime_link_metric_get(local, sta);
+	new_metric = orig_metric + last_hop_metric;
+	if (new_metric < orig_metric)
+		new_metric = MAX_METRIC;
 
 	mpath = mesh_path_lookup(sdata, orig_addr);
 	if (!mpath) {
@@ -804,7 +807,7 @@ static void hwmp_rann_frame_process(stru
 	}
 
 	if (!(SN_LT(mpath->sn, orig_sn)) &&
-	    !(mpath->sn == orig_sn && metric < mpath->rann_metric)) {
+	    !(mpath->sn == orig_sn && new_metric < mpath->rann_metric)) {
 		rcu_read_unlock();
 		return;
 	}
@@ -822,7 +825,7 @@ static void hwmp_rann_frame_process(stru
 	}
 
 	mpath->sn = orig_sn;
-	mpath->rann_metric = metric + metric_txsta;
+	mpath->rann_metric = new_metric;
 	mpath->is_root = true;
 	/* Recording RANNs sender address to send individually
 	 * addressed PREQs destined for root mesh STA */
@@ -842,7 +845,7 @@ static void hwmp_rann_frame_process(stru
 		mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr,
 				       orig_sn, 0, NULL, 0, broadcast_addr,
 				       hopcount, ttl, interval,
-				       metric + metric_txsta, 0, sdata);
+				       new_metric, 0, sdata);
 	}
 
 	rcu_read_unlock();


Patches currently in stable-queue which might be from yeohchunyeow@gmail.com are

queue-3.18/mac80211-fix-the-update-of-path-metric-for-rann-frame.patch