netdev - Re: [PATCH 3/7 net-2.6.25] [IPV4]: Prohibit assignment of 0.0.0.0 as interface address.

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Message-ID: <4799EE8C.60407@sw.ru>
Date:	Fri, 25 Jan 2008 17:13:32 +0300
From:	"Denis V. Lunev" <den@...ru>
To:	Daniel Lezcano <dlezcano@...ibm.com>
CC:	"Denis V. Lunev" <den@...nvz.org>, davem@...emloft.net,
	netdev@...r.kernel.org, devel@...nvz.org, containers@...ts.osdl.org
Subject: Re: [PATCH 3/7 net-2.6.25] [IPV4]: Prohibit assignment of 0.0.0.0
 as interface address.

Daniel Lezcano wrote:
> Denis V. Lunev wrote:
>> I could hardly imagine why sombady needs to assign 0.0.0.0 as an
>> interface
>> address or interface destination address. The kernel will behave in a
>> strage
>> way in several places if this is possible, as ifa_local != 0 is
>> considered
>> as initialized/non-initialized state of the ifa.
> 
> AFAICS, we should be able to set at an interface address to 0.0.0.0, in
> order to remove an IP address from an interface and keep this one up.
> I see two trivial cases:
>  * remove the ipv4 on an interface but continue to use it through ipv6
>  * move ipv4 address from the interface to an attached bridge

For this case there is an IOCTL/netlink "remove IP address".
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