netdev - Re: [PATCH net] neighbour: allow NUD_NOARP entries to be forced GCed

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Message-Id: <20210607.152629.1604704104944229264.davem@davemloft.net>
Date:   Mon, 07 Jun 2021 15:26:29 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     dsahern@...nel.org
Cc:     netdev@...r.kernel.org, kuba@...nel.org,
        kasperd@...wv.06.feb.2021.kasperd.net, cascardo@...onical.com
Subject: Re: [PATCH net] neighbour: allow NUD_NOARP entries to be forced
 GCed

From: David Ahern <dsahern@...nel.org>
Date: Mon,  7 Jun 2021 11:35:30 -0600

> IFF_POINTOPOINT interfaces use NUD_NOARP entries for IPv6. It's possible to
> fill up the neighbour table with enough entries that it will overflow for
> valid connections after that.
> 
> This behaviour is more prevalent after commit 58956317c8de ("neighbor:
> Improve garbage collection") is applied, as it prevents removal from
> entries that are not NUD_FAILED, unless they are more than 5s old.
> 
> Fixes: 58956317c8de (neighbor: Improve garbage collection)
> Reported-by: Kasper Dupont <kasperd@...wv.06.feb.2021.kasperd.net>
> Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...onical.com>
> Signed-off-by: David Ahern <dsahern@...nel.org>
> ---
> rebased to net tree

Applied, thanks.