netdev - Re: [PATCH net-next] ipv6/route: inherit max

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Date:   Wed, 20 May 2020 10:54:21 -0600
From:   David Ahern <dsahern@...il.com>
To:     Christian Brauner <christian.brauner@...ntu.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] ipv6/route: inherit max_sizes from current netns

On 5/20/20 8:58 AM, Christian Brauner wrote:
> During NorthSec (cf. [1]) a very large number of unprivileged
> containers and nested containers are run during the competition to
> provide a safe environment for the various teams during the event. Every
> year a range of feature requests or bug reports come out of this and
> this year's no different.
> One of the containers was running a simple VPN server. There were about
> 1.5k users connected to this VPN over ipv6 and the container was setup
> with about 100 custom routing tables when it hit the max_sizes routing
> limit. After this no new connections could be established anymore,
> pinging didn't work anymore; you get the idea.
> 

should have been addressed by:

commit d8882935fcae28bceb5f6f56f09cded8d36d85e6
Author: Eric Dumazet <edumazet@...gle.com>
Date:   Fri May 8 07:34:14 2020 -0700
    ipv6: use DST_NOCOUNT in ip6_rt_pcpu_alloc()
    We currently have to adjust ipv6 route gc_thresh/max_size depending
    on number of cpus on a server, this makes very little sense.


Did your tests include this patch?