Re: [PATCH] net: preserve IP control block during GSO segmentation
From: Konstantin Khlebnikov
Date: Fri Jan 08 2016 - 07:10:38 EST
On Fri, Jan 8, 2016 at 3:00 PM, Konstantin Khlebnikov <koct9i@xxxxxxxxx> wrote:
> Skb_gso_segment() uses skb control block during segmentation.
> This patch adds 32-bytes room for previous control block which
> will be copied into all resulting segments.
> This patch fixes kernel crash during fragmenting forwarded packets.
> Fragmentation requires valid IP CB in skb for clearing ip options.
> Also patch removes custom save/restore in ovs code, now it's redundant.
> Signed-off-by: Konstantin Khlebnikov <koct9i@xxxxxxxxx>
> Link: http://lkml.kernel.org/r/CALYGNiP-0MZ-FExV2HutTvE9U-QQtkKSoE--KN=JQE5STYsjAA@xxxxxxxxxxxxxx
This patch is alternative for [PATCH] net: prevent corruption of skb when using
skb_gso_segment by Thadeu Lima de Souza Cascardo. This version have
no stack allocations and no changes in code. It just shifts gso cb.