netdev - Re: [PATCH] netfilter: masquerade: don't flush all conntracks if only one address deleted on device

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Date:   Fri, 28 Sep 2018 14:22:11 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Tan Hu <tan.hu@....com.cn>
Cc:     kadlec@...ckhole.kfki.hu, fw@...len.de, davem@...emloft.net,
        kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        zhong.weidong@....com.cn, jiang.biao2@....com.cn
Subject: Re: [PATCH] netfilter: masquerade: don't flush all conntracks if
 only one address deleted on device

On Fri, Sep 07, 2018 at 04:33:33PM +0800, Tan Hu wrote:
> We configured iptables as below, which only allowed incoming data on
> established connections:
> 
> iptables -t mangle -A PREROUTING -m state --state ESTABLISHED -j ACCEPT
> iptables -t mangle -P PREROUTING DROP
> 
> When deleting a secondary address, current masquerade implements would
> flush all conntracks on this device. All the established connections on
> primary address also be deleted, then subsequent incoming data on the
> connections would be dropped wrongly because it was identified as NEW
> connection.
> 
> So when an address was delete, it should only flush connections related
> with the address.

Applied to nf-next, thanks.