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gre: Fix MTU calculation for bound GRE tunnels

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The GRE header length should be subtracted when the tunnel MTU is
calculated.  This just corrects for the associativity change
introduced by commit 42aa916265d740d66ac1f17290366e9494c884c2
("gre: Move MTU setting out of ipgre_tunnel_bind_dev").

Signed-off-by: Tom Goff <thomas.goff@boeing.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Goff 2009-08-14 16:33:56 -07:00 committed by David S. Miller
parent 7c1d15d736
commit 8cdb045632
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/ip_gre.c
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@ -951,7 +951,7 @@ static int ipgre_tunnel_bind_dev(struct net_device *dev)
addend += 4;
}
dev->needed_headroom = addend + hlen;
mtu -= dev->hard_header_len - addend;
mtu -= dev->hard_header_len + addend;
if (mtu < 68)
mtu = 68;