netdev - Re: [PATCH ipsec] xfrm: esp6: fix the location of the transport header with encapsulation

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Date:   Wed, 29 Jul 2020 13:35:42 +0200
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Sabrina Dubroca <sd@...asysnail.net>
CC:     <netdev@...r.kernel.org>, Xiumei Mu <xmu@...hat.com>
Subject: Re: [PATCH ipsec] xfrm: esp6: fix the location of the transport
 header with encapsulation

On Mon, Jul 27, 2020 at 04:03:47PM +0200, Sabrina Dubroca wrote:
> commit 17175d1a27c6 ("xfrm: esp6: fix encapsulation header offset
> computation") changed esp6_input_done2 to correctly find the size of
> the IPv6 header that precedes the TCP/UDP encapsulation header, but
> didn't adjust the final call to skb_set_transport_header, which I
> assumed was correct in using skb_network_header_len.
> 
> Xiumei Mu reported that when we create xfrm states that include port
> numbers in the selector, traffic from the user sockets is dropped. It
> turns out that we get a state mismatch in __xfrm_policy_check, because
> we end up trying to compare the encapsulation header's ports with the
> selector that's based on user traffic ports.
> 
> Fixes: 0146dca70b87 ("xfrm: add support for UDPv6 encapsulation of ESP")
> Fixes: 26333c37fc28 ("xfrm: add IPv6 support for espintcp")
> Reported-by: Xiumei Mu <xmu@...hat.com>
> Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>

Applied, thanks a lot Sabrina!