netdev - Re: [RFC PATCH net-next V2] net: split rt

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Message-ID: <51EF8C87.4060707@windriver.com>
Date:	Wed, 24 Jul 2013 16:12:55 +0800
From:	Fan Du <fan.du@...driver.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
CC:	<davem@...emloft.net>, <nicolas.dichtel@...nd.com>,
	<yoshfuji@...ux-ipv6.org>, <jmorris@...ei.org>,
	<steffen.klassert@...unet.com>, <netdev@...r.kernel.org>
Subject: Re: [RFC PATCH net-next V2] net: split rt_genid for ipv4 and ipv6

Hallo Hannes

On 2013年07月23日 10:04, Hannes Frederic Sowa wrote:
> On Tue, Jul 23, 2013 at 09:37:00AM +0800, Fan Du wrote:
>> Current net name space has only one genid for both IPv4 and IPv6, it has below drawbacks:
>>
>> - Add/delete an IPv4 address will invalidate all IPv6 routing table entries.
>> - Insert/remove XFRM policy will also invalidate both IPv4/IPv6 routing table entries
>>    even when the policy is only applied for one address family.
>>
>> Thus, this patch attempt to split one genid for two to cater for IPv4 and IPv6 separately
>> in a fine granularity.
>
> For me the approach seems reasonable. We should double-check if this
> does not affect v4mapped af_inet6 sockets in any way. I could help to
> do the review if there is an agreement that the split is desirable.

Thank you for your attention :)

v4mapped af_inet6 address shouldn't cause problem, as long as the mapped
v4 address is routable in IPv4 stack, so add/delete IPv6 address doesn't
interfere IPv4 routing entry.

> Thanks,
>
>    Hannes
>
>

-- 
浮沉随浪只记今朝笑

--fan
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