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>
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1 changed files with 1 additions and 1 deletions
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@ -951,7 +951,7 @@ static int ipgre_tunnel_bind_dev(struct net_device *dev)
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addend += 4;
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}
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dev->needed_headroom = addend + hlen;
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mtu -= dev->hard_header_len - addend;
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mtu -= dev->hard_header_len + addend;
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if (mtu < 68)
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mtu = 68;
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