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

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Message-ID: <52CBB3FC.9050207@windriver.com>
Date:	Tue, 7 Jan 2014 15:59:56 +0800
From:	Fan Du <fan.du@...driver.com>
To:	Steffen Klassert <steffen.klassert@...unet.com>
CC:	<davem@...emloft.net>, <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



On 2014年01月07日 15:47, Steffen Klassert wrote:
> On Tue, Jan 07, 2014 at 02:48:57PM +0800, Fan Du wrote:
>> 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.
>>
>> Further investigatino shows that:
>> L: kernel
>> R: iproute2
>>
>>            sizeof       userpolicy      usersa
>> 64bits(unpacked)        168/168        224/224
>> 32bits(unpacked)        164/164        220/220
>>                           ^   ^
>>                           L   R
>>
>> To keep kernel and user land see a consistent structure, after
>> add packing attribute, now it looks like this:
>>
>> 64bits(  packed)        164/164        217/217
>> 32bits(  packed)        164/164        217/217
>>                           ^   ^
>>                           L   R
>>
>
> We don't change userspace exported structures. This breaks
> existing userspace tools.
>

Then user with 32bits iproute2 or StrongSwan has to rebuild as 64bits?

-- 
浮沉随浪只记今朝笑

--fan
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