netdev - Re: [PATCH net-next 0/2] Pack struct xfrm_usersa_info and struct xfrm_userpolicy

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Message-Id: <20140107.130749.215535043457683103.davem@davemloft.net>
Date:	Tue, 07 Jan 2014 13:07:49 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	fan.du@...driver.com
Cc:	steffen.klassert@...unet.com, stephen@...workplumber.org,
	dev@...ts.strongswan.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 0/2] Pack struct xfrm_usersa_info and struct
 xfrm_userpolicy_info

From: Fan Du <fan.du@...driver.com>
Date: Tue, 7 Jan 2014 14:48:57 +0800

> When trying to setup IPsec configuration on a 64bits host with
> iproute2(32bits compiled), the intened xfrm policy and sa is
> either deficit or wrong when kernel trying to parse user land
> information.

You can't make this change without breaking userspace.

We'll have to translate the data structures somehow with a compat
layer like we have for 32/64 bit compatability for system calls.
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