linux-kernel - [PATCH 3.2 38/87] mac80211: drop spoofed packets in ad-hoc mode

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Date:	Mon, 25 Nov 2013 13:44:29 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Johannes Berg" <johannes.berg@...el.com>,
	"Felix Fietkau" <nbd@...nwrt.org>,
	"Thomas Huehn" <thomas@....t-labs.tu-berlin.de>
Subject: [PATCH 3.2 38/87] mac80211: drop spoofed packets in ad-hoc mode

3.2.53-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Felix Fietkau <nbd@...nwrt.org>

commit 6329b8d917adc077caa60c2447385554130853a3 upstream.

If an Ad-Hoc node receives packets with the Cell ID or its own MAC
address as source address, it hits a WARN_ON in sta_info_insert_check()
With many packets, this can massively spam the logs. One way that this
can easily happen is through having Cisco APs in the area with rouge AP
detection and countermeasures enabled.
Such Cisco APs will regularly send fake beacons, disassoc and deauth
packets that trigger these warnings.

To fix this issue, drop such spoofed packets early in the rx path.

Reported-by: Thomas Huehn <thomas@....t-labs.tu-berlin.de>
Signed-off-by: Felix Fietkau <nbd@...nwrt.org>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
[bwh: Backported to 3.2: use compare_ether_addr() instead of ether_addr_equal()]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/mac80211/rx.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -2780,6 +2780,9 @@ static int prepare_for_handlers(struct i
 	case NL80211_IFTYPE_ADHOC:
 		if (!bssid)
 			return 0;
+		if (compare_ether_addr(sdata->vif.addr, hdr->addr2) == 0 ||
+		    compare_ether_addr(sdata->u.ibss.bssid, hdr->addr2) == 0)
+			return 0;
 		if (ieee80211_is_beacon(hdr->frame_control)) {
 			return 1;
 		}

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