netdev - Re: [Patch net] macvlan: add NETIF_F_NETNS

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Message-ID: <CAHA+R7MhHuOPaT5oAF_S-a3u1_2mt=Vqd5HCdi9r3JV-fK-6Pw@mail.gmail.com>
Date:	Mon, 10 Feb 2014 20:41:07 -0800
From:	Cong Wang <cwang@...pensource.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Cong Wang <xiyou.wangcong@...il.com>,
	netdev <netdev@...r.kernel.org>,
	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [Patch net] macvlan: add NETIF_F_NETNS_LOCAL flag

On Mon, Feb 10, 2014 at 8:15 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Tue, 2014-02-11 at 03:40 +0100, Hannes Frederic Sowa wrote:
>
>> Setting up a macvlan and moving it into another namespace without moving
>> the parent device is a nice feature. I am not an administrator, so I don't
>> use that stuff often, but given you can easily spawn namespaces and put
>> applications into them, one of the easiest things to connect those to
>> local network without routing over veth and such is the macvlan interface.
>
> Exactly.
>

Exactly broken by design.

IFA_LINK is an ifindex, ifindex is per-netns. macvlan should not use IFA_LINK.
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