[ovs-dev] [PATCH 0/3] Check gso_size of packets when forwarding
David Miller
davem at davemloft.net
Wed Jan 17 20:20:21 UTC 2018
From: Daniel Axtens <dja at axtens.net>
Date: Tue, 16 Jan 2018 13:09:17 +1100
> When regular packets are forwarded, we validate their size against the
> MTU of the destination device. However, when GSO packets are
> forwarded, we do not validate their size against the MTU. We
> implicitly assume that when they are segmented, the resultant packets
> will be correctly sized.
>
> This is not always the case.
>
> We observed a case where a packet received on an ibmveth device had a
> GSO size of around 10kB. This was forwarded by Open vSwitch to a bnx2x
> device, where it caused a firmware assert. This is described in detail
> at [0] and was the genesis of this series. Rather than fixing it in
> the driver, this series fixes the forwarding path.
>
> To fix this:
>
> - Move a helper in patch 1.
>
> - Validate GSO segment lengths in is_skb_forwardable() in the GSO
> case, rather than assuming all will be well. This fixes bridges.
> This is patch 2.
>
> - Open vSwitch uses its own slightly specialised algorithm for
> checking lengths. Wire up checking for that in patch 3.
>
> [0]: https://patchwork.ozlabs.org/patch/859410/
This looks good to me, could the OVS folks please review this patch
series?
Thank you.
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