[ 70/86] bridge: set priority of STP packets

From: Greg Kroah-Hartman
Date: Tue Feb 26 2013 - 19:13:03 EST

3.4-stable review patch. If anyone has any objections, please let me know.


From: Stephen Hemminger <stephen@xxxxxxxxxxxxxxxxxx>

[ Upstream commit 547b4e718115eea74087e28d7fa70aec619200db ]

Spanning Tree Protocol packets should have always been marked as
control packets, this causes them to get queued in the high prirority
FIFO. As Radia Perlman mentioned in her LCA talk, STP dies if bridge
gets overloaded and can't communicate. This is a long-standing bug back
to the first versions of Linux bridge.

Signed-off-by: Stephen Hemminger <stephen@xxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
net/bridge/br_stp_bpdu.c | 2 ++
1 file changed, 2 insertions(+)

--- a/net/bridge/br_stp_bpdu.c
+++ b/net/bridge/br_stp_bpdu.c
@@ -16,6 +16,7 @@
#include <linux/etherdevice.h>
#include <linux/llc.h>
#include <linux/slab.h>
+#include <linux/pkt_sched.h>
#include <net/net_namespace.h>
#include <net/llc.h>
#include <net/llc_pdu.h>
@@ -40,6 +41,7 @@ static void br_send_bpdu(struct net_brid

skb->dev = p->dev;
skb->protocol = htons(ETH_P_802_2);
+ skb->priority = TC_PRIO_CONTROL;

skb_reserve(skb, LLC_RESERVE);
memcpy(__skb_put(skb, length), data, length);

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