linux-kernel - [76/82] net/core: Allow tagged VLAN packets to flow through VETH devices.

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Date:	Fri, 19 Nov 2010 13:56:37 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Ben Greear <greearb@...delatech.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [76/82] net/core: Allow tagged VLAN packets to flow through VETH devices.

2.6.35-stable review patch.  If anyone has any objections, please let us know.

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


From: Ben Greear <greearb@...delatech.com>

[ Upstream commit d2ed817766987fd05e69b7da65d4861b38f1aa2a ]

When there are VLANs on a VETH device, the packets being transmitted
through the VETH device may be 4 bytes bigger than MTU.  A check
in dev_forward_skb did not take this into account and so dropped
these packets.

This patch is needed at least as far back as 2.6.34.7 and should
be considered for -stable.

Signed-off-by: Ben Greear <greearb@...delatech.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 net/core/dev.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1491,7 +1491,7 @@ int dev_forward_skb(struct net_device *d
 	nf_reset(skb);
 
 	if (!(dev->flags & IFF_UP) ||
-	    (skb->len > (dev->mtu + dev->hard_header_len))) {
+	    (skb->len > (dev->mtu + dev->hard_header_len + VLAN_HLEN))) {
 		kfree_skb(skb);
 		return NET_RX_DROP;
 	}


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