netdev - Re: [PATCH net v2] rtnetlink: always put ILFA

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Message-ID: <b89367f0-18d5-61b2-2572-b1e5b4588d8d@6wind.com>
Date:   Mon, 13 May 2019 16:50:51 +0200
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     Sabrina Dubroca <sd@...asysnail.net>, netdev@...r.kernel.org
Cc:     Dan Winship <danw@...hat.com>
Subject: Re: [PATCH net v2] rtnetlink: always put ILFA_LINK for links with a
 link-netnsid

Le 13/05/2019 à 15:47, Sabrina Dubroca a écrit :
> Currently, nla_put_iflink() doesn't put the IFLA_LINK attribute when
> iflink == ifindex.
> 
> In some cases, a device can be created in a different netns with the
> same ifindex as its parent. That device will not dump its IFLA_LINK
> attribute, which can confuse some userspace software that expects it.
> For example, if the last ifindex created in init_net and foo are both
> 8, these commands will trigger the issue:
> 
>     ip link add parent type dummy                   # ifindex 9
>     ip link add link parent netns foo type macvlan  # ifindex 9 in ns foo
> 
> So, in case a device puts the IFLA_LINK_NETNSID attribute in a dump,
> always put the IFLA_LINK attribute as well.
> 
> Thanks to Dan Winship for analyzing the original OpenShift bug down to
> the missing netlink attribute.
> 
> Analyzed-by: Dan Winship <danw@...hat.com>
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
I would say:
Fixes: 5e6700b3bf98 ("sit: add support of x-netns")

Because before this patch, there was no device with an iflink that can be put in
another netns.


Regards,
Nicolas