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Commit 8cdb0456 authored by Tom Goff's avatar Tom Goff Committed by David S. Miller
Browse files

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 42aa9162
("gre: Move MTU setting out of ipgre_tunnel_bind_dev").

Signed-off-by: default avatarTom Goff <thomas.goff@boeing.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7c1d15d7

net/ipv4/ip_gre.c

+1 −1
Original line number Diff line number Diff line
@@ -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;