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gro: Allow tunnel stacking in the case of FOU/GUE 

This patch should fix the issues seen with a recent fix to prevent
tunnel-in-tunnel frames from being generated with GRO.  The fix itself is
correct for now as long as we do not add any devices that support
NETIF_F_GSO_GRE_CSUM.  When such a device is added it could have the
potential to mess things up due to the fact that the outer transport header
points to the outer UDP header and not the GRE header as would be expected.

Fixes: fac8e0f579 ("tunnels: Don't apply GRO to multiple layers of encapsulation.")
Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck 2016-03-29 14:55:22 -07:00 committed by David S. Miller
parent fea24857bb
commit c3483384ee
1 changed files with 16 additions and 0 deletions
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16
net/ipv4/fou.c
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@ -195,6 +195,14 @@ static struct sk_buff **fou_gro_receive(struct sk_buff **head,
u8 proto = NAPI_GRO_CB(skb)->proto;
const struct net_offload **offloads;
/* We can clear the encap_mark for FOU as we are essentially doing
* one of two possible things. We are either adding an L4 tunnel
* header to the outer L3 tunnel header, or we are are simply
* treating the GRE tunnel header as though it is a UDP protocol
* specific header such as VXLAN or GENEVE.
*/
NAPI_GRO_CB(skb)->encap_mark = 0;
rcu_read_lock();
offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
ops = rcu_dereference(offloads[proto]);
@ -352,6 +360,14 @@ static struct sk_buff **gue_gro_receive(struct sk_buff **head,
}
}
/* We can clear the encap_mark for GUE as we are essentially doing
* one of two possible things. We are either adding an L4 tunnel
* header to the outer L3 tunnel header, or we are are simply
* treating the GRE tunnel header as though it is a UDP protocol
* specific header such as VXLAN or GENEVE.
*/
NAPI_GRO_CB(skb)->encap_mark = 0;
rcu_read_lock();
offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
ops = rcu_dereference(offloads[guehdr->proto_ctype]);