netdev - Re: [PATCH ipsec] xfrm: esp6: fix encapsulation header offset computation

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Message-ID: <20200708081431.GZ19286@gauss3.secunet.de>
Date:   Wed, 8 Jul 2020 10:14:31 +0200
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Sabrina Dubroca <sd@...asysnail.net>
CC:     <netdev@...r.kernel.org>, Tobias Brunner <tobias@...ongswan.org>
Subject: Re: [PATCH ipsec] xfrm: esp6: fix encapsulation header offset
 computation

On Fri, Jul 03, 2020 at 04:57:09PM +0200, Sabrina Dubroca wrote:
> In commit 0146dca70b87, I incorrectly adapted the code that computes
> the location of the UDP or TCP encapsulation header from IPv4 to
> IPv6. In esp6_input_done2, skb->transport_header points to the ESP
> header, so by adding skb_network_header_len, uh and th will point to
> the ESP header, not the encapsulation header that's in front of it.
> 
> Since the TCP header's size can change with options, we have to start
> from the IPv6 header and walk past possible extensions.
> 
> Fixes: 0146dca70b87 ("xfrm: add support for UDPv6 encapsulation of ESP")
> Fixes: 26333c37fc28 ("xfrm: add IPv6 support for espintcp")
> Reported-by: Tobias Brunner <tobias@...ongswan.org>
> Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>

Applied, thanks Sabrina!