gre: Fix MTU sizing check for gretap tunnels
[ Upstream commit 8c91e162e058bb91b7766f26f4d5823a21941026 ] This change fixes an MTU sizing issue seen with gretap tunnels when non-gso packets are sent from the interface. In my case I was able to reproduce the issue by simply sending a ping of 1421 bytes with the gretap interface created on a device with a standard 1500 mtu. This fix is based on the fact that the tunnel mtu is already adjusted by dev->hard_header_len so it would make sense that any packets being compared against that mtu should also be adjusted by hard_header_len and the tunnel header instead of just the tunnel header. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Reported-by: Cong Wang <amwang@redhat.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -490,7 +490,7 @@ static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb,
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struct rtable *rt, __be16 df)
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{
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struct ip_tunnel *tunnel = netdev_priv(dev);
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int pkt_size = skb->len - tunnel->hlen;
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int pkt_size = skb->len - tunnel->hlen - dev->hard_header_len;
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int mtu;
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if (df)
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