netdev - Re: [PATCH next v2 0/7] Introduce l3

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Date:	Thu, 17 Mar 2016 09:47:47 +0100
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	Mahesh Bandewar <maheshb@...gle.com>,
	David Miller <davem@...emloft.net>
Cc:	mahesh@...dewar.net, Eric Dumazet <edumazet@...gle.com>,
	linux-netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH next v2 0/7] Introduce l3_dev pointer for L3 processing

Le 14/03/2016 18:57, Mahesh Bandewar a écrit :
> On Sun, Mar 13, 2016 at 8:53 PM, David Miller <davem@...emloft.net> wrote:
[snip]
>> Furthermore, when you walk across the ns boundary, that old device has
>> to disappear.  That's why that is the device assigned to skb->dev.
>>
> The layer boundaries are not that well maintained. We do check for the xfrm
> policies in L4 and expect the skb->dev pointing to the L3 device. So unless we
> have a way to derive a L3 dev from skb->dev, I don't think xfrm will
> work. Unless
> some Xfrm-expert asserts that this is not needed.
Adding a hook "at the right place" to do the switch is probably the better way.
For xfrm, you will need to handle it in this hook or rearrange things.
I don't think that a quick and easy solution will be possible.