netdev - Re: [PATCH] net: ip6_gre: fix moving ip6gre between namespaces

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Date:   Thu, 16 Jan 2020 17:00:15 +0100
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     kortstro <niko.kortstrom@...ia.com>, davem@...emloft.net,
        kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org
Cc:     netdev@...r.kernel.org, William Tu <u9012063@...il.com>
Subject: Re: [PATCH] net: ip6_gre: fix moving ip6gre between namespaces

+ William Tu

Le 16/01/2020 à 15:43, kortstro a écrit :
> On 1/16/20 4:02 PM, Nicolas Dichtel wrote:
>> Le 16/01/2020 à 10:43, Niko Kortstrom a écrit :
>>> Support for moving IPv4 GRE tunnels between namespaces was added in
>>> commit b57708add314 ("gre: add x-netns support"). The respective change
>>> for IPv6 tunnels, commit 22f08069e8b4 ("ip6gre: add x-netns support")
>>> did not drop NETIF_F_NETNS_LOCAL flag so moving them from one netns to
>>> another is still denied in IPv6 case. Drop NETIF_F_NETNS_LOCAL flag from
>>> ip6gre tunnels to allow moving ip6gre tunnel endpoints between network
>>> namespaces.
>>>
>>> Signed-off-by: Niko Kortstrom <niko.kortstrom@...ia.com>
>> LGTM.
>> Acked-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
>>
>> Did you test real x-vrf cases with the three kinds of gre interfaces
>> (gre/collect_md, gretap and erspan)?
> This was only verified in real use with ip6gretap.
William, did you set this flag on collect_md interfaces because you did not test
this feature or was it another reason?

Note: the flag was added here: 6712abc168eb ("ip6_gre: add ip6 gre and gretap
collect_md mode").

Regards,
Nicolas