linux-kernel - [PATCH AUTOSEL for 4.4 23/32] mac80211: mesh: drop frames appearing to be from us

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Message-ID: <20180203180413.7438-23-alexander.levin@microsoft.com>
Date:   Sat, 3 Feb 2018 18:04:36 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Johannes Berg <johannes.berg@...el.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.4 23/32] mac80211: mesh: drop frames appearing
 to be from us

From: Johannes Berg <johannes.berg@...el.com>

[ Upstream commit 736a80bbfda709fb3631f5f62056f250a38e5804 ]

If there are multiple mesh stations with the same MAC address,
they will both get confused and start throwing warnings.

Obviously in this case nothing can actually work anyway, so just
drop frames that look like they're from ourselves early on.

Reported-by: Gui Iribarren <gui@...ermundi.net>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 net/mac80211/rx.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 3bcabc2ba4a6..f8406c37fc1d 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -3367,6 +3367,8 @@ static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
 		}
 		return true;
 	case NL80211_IFTYPE_MESH_POINT:
+		if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
+			return false;
 		if (multicast)
 			return true;
 		return ether_addr_equal(sdata->vif.addr, hdr->addr1);
-- 
2.11.0