netdev - Re: [PATCH RFC/RFT net-next 00/17] net: Convert neighbor tables to per-namespace

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Date:   Tue, 17 Jul 2018 10:40:09 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     dsahern@...nel.org
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        nikita.leshchenko@...cle.com,
        Roopa Prabhu <roopa@...ulusnetworks.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Ido Schimmel <idosch@...lanox.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>, alex.aring@...il.com,
        linux-wpan@...r.kernel.org,
        NetFilter <netfilter-devel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        David Ahern <dsahern@...il.com>
Subject: Re: [PATCH RFC/RFT net-next 00/17] net: Convert neighbor tables to per-namespace

On Tue, Jul 17, 2018 at 5:11 AM <dsahern@...nel.org> wrote:
>
> From: David Ahern <dsahern@...il.com>
>
> Nikita Leshenko reported that neighbor entries in one namespace can
> evict neighbor entries in another. The problem is that the neighbor
> tables have entries across all namespaces without separate accounting
> and with global limits on when to scan for entries to evict.

It is nothing new, people including me already noticed this before.


>
> Resolve by making the neighbor tables for ipv4, ipv6 and decnet per
> namespace and making the accounting and threshold limits per namespace.


The last discussion about this a long time ago concluded that neigh
table entries are controllable by remote, so after moving it to per netns,
it would be easier to DOS the host.