netdev - Re: [PATCH] ipv6: Fix udp checksums with raw sockets

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Message-ID: <1431653055.27831.84.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 14 May 2015 18:24:15 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Vladislav Yasevich <vyasevich@...il.com>
Cc:	netdev@...r.kernel.org, Vladislav Yasevich <vyasevic@...hat.com>,
	Wolfgang Walter <linux@...m.de>
Subject: Re: [PATCH] ipv6: Fix udp checksums with raw sockets

On Thu, 2015-05-14 at 20:34 -0400, Vladislav Yasevich wrote:
> It was reported that trancerout6 would cause
> a kernel to crash when trying to compute checksums
> on raw UDP packets.  The cause was the check in
> __ip6_append_data that would attempt to use
> partial checksums on the packet.  However,
> raw sockets do not initialize partial checksum
> fields so partial checksums can't be used.
> 
> Solve this the same way IPv4 does it.  raw sockets
> pass transhdrlen value of 0 to ip_append_data which
> causes the checksum to be computed in software.  Use
> the same check in ip6_append_data (check transhdrlen).
> 
> Reported-by: Wolfgang Walter <linux@...m.de>
> CC: Wolfgang Walter <linux@...m.de>
> CC: Eric Dumazet <eric.dumazet@...il.com>
> Signed-off-by: Vladislav Yasevich <vyasevic@...hat.com>
> ---

Acked-by: Eric Dumazet <edumazet@...gle.com>


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