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gre: Fix MTU calculation for bound GRE tunnels 

The GRE header length should be subtracted when the tunnel MTU is
calculated.  This just corrects for the associativity change
introduced by commit 42aa916265
("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;