netdev - Re: [PATCH net-next] ipv6: allow userspace to add IFA_F

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Message-Id: <20180227.104708.1983037304358643327.davem@davemloft.net>
Date:   Tue, 27 Feb 2018 10:47:08 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     sd@...asysnail.net
Cc:     dsahern@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] ipv6: allow userspace to add IFA_F_OPTIMISTIC
 addresses

From: Sabrina Dubroca <sd@...asysnail.net>
Date: Tue, 27 Feb 2018 15:13:28 +0100

> 2018-02-26, 12:11:27 -0500, David Miller wrote:
>> From: Sabrina Dubroca <sd@...asysnail.net>
>> Date: Mon, 26 Feb 2018 17:56:19 +0100
>> 
>> That's completely different to this case, which is a bonfide explicit
>> allowance for userspace to take over these fundamental protocol tasks
>> from the kernel.
> 
> This is not letting userspace take over. On the contrary, it allows
> userspace to take advantage of the kernel's DAD, without suffering the
> delay. The alternative, without optimistic DAD, would be to completely
> disable DAD done by the kernel.
> 
> This follows RFC 4429, which explicitly allows optimistic DAD for
> addresses generated by (among other mechanisms) DHCPv6.

Fair enough.

We can resume this conversation if and when problems pop up in the
future :-)