svn commit: r289316 - in head/sys: net netpfil/pf

[Baptiste Daroussin]

On Wed, Oct 14, 2015 at 04:21:41PM +0000, Kristof Provost wrote:
> Author: kp
> Date: Wed Oct 14 16:21:41 2015
> New Revision: 289316
> URL: https://svnweb.freebsd.org/changeset/base/289316
> 
> Log:
>   pf: Fix TSO issues
>   
>   In certain configurations (mostly but not exclusively as a VM on Xen) pf
>   produced packets with an invalid TCP checksum.
>   
>   The problem was that pf could only handle packets with a full checksum. The
>   FreeBSD IP stack produces TCP packets with a pseudo-header checksum (only
>   addresses, length and protocol).
>   Certain network interfaces expect to see the pseudo-header checksum, so they
>   end up producing packets with invalid checksums.
>   
>   To fix this stop calculating the full checksum and teach pf to only update TCP
>   checksums if TSO is disabled or the change affects the pseudo-header checksum.
>   
>   PR:		154428, 193579, 198868
>   Reviewed by:	sbruno
>   MFC after:	1 week
>   Relnotes:	yes
>   Sponsored by:	RootBSD
>   Differential Revision:	https://reviews.freebsd.org/D3779
> 
Excellent! do you think it would be possible to get an errata on 10.2? that
would be useful for every instance of freebsd running on cloudish stuff!

Best regards,
Bapt
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