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

[Cong Wang]

On Tue, Jul 17, 2018 at 5:11 AM <dsahern@xxxxxxxxxx> wrote:
>
> From: David Ahern <dsahern@xxxxxxxxx>
>
> 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.