From: Paolo Abeni <[email protected]>
Date: Tue, 7 Mar 2017 18:33:31 +0100
> The gso code of several tunnels type (gre and udp tunnels)
> takes for granted that the skb->inner_protocol is properly
> initialized and drops the packet elsewhere.
>
> On the forwarding path no one is initializing such field,
> so gro encapsulated packets are dropped on forward.
>
> Since commit 38720352412a ("gre: Use inner_proto to obtain
> inner header protocol"), this can be reproduced when the
> encapsulated packets use gre as the tunneling protocol.
>
> The issue happens also with vxlan and geneve tunnels since
> commit 8bce6d7d0d1e ("udp: Generalize skb_udp_segment"), if the
> forwarding host's ingress nic has h/w offload for such tunnel
> and a vxlan/geneve device is configured on top of it, regardless
> of the configured peer address and vni.
>
> To address the issue, this change initialize the inner_protocol
> field for encapsulated packets in both ipv4 and ipv6 gro complete
> callbacks.
>
> Fixes: 38720352412a ("gre: Use inner_proto to obtain inner header protocol")
> Fixes: 8bce6d7d0d1e ("udp: Generalize skb_udp_segment")
> Signed-off-by: Paolo Abeni <[email protected]>
Applied and queued up for -stable.
