netdev - Re: b118509076b3 (probably) breaks my firewall

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Message-ID: <78611fbd-434e-c948-5677-a0bdb66f31a5@googlemail.com>
Date:   Thu, 8 Sep 2022 22:22:36 +0100
From:   Chris Clayton <chris2553@...glemail.com>
To:     Florian Westphal <fw@...len.de>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: b118509076b3 (probably) breaks my firewall



On 08/09/2022 20:19, Florian Westphal wrote:
> Chris Clayton <chris2553@...glemail.com> wrote:
>> Just a heads up and a question...
>>
>> I've pulled the latest and greatest from Linus' tree and built and installed the kernel. git describe gives
>> v6.0-rc4-126-g26b1224903b3.
>>
>> I find that my firewall is broken because /proc/sys/net/netfilter/nf_conntrack_helper no longer exists. It existed on an
>> -rc4 kernel. Are changes like this supposed to be introduced at this stage of the -rc cycle?
> 
> The problem is that the default-autoassign (nf_conntrack_helper=1) has
> side effects that most people are not aware of.
> 
> The bug that propmpted this toggle from getting axed was that the irc (dcc) helper allowed
> a remote client to create a port forwarding to the local client.


Ok, but I still think it's not the sort of change that should be introduced at this stage of the -rc cycle.

The other problem is that the documentation (Documentation/networking/nf_conntrack-sysctl.rst) hasn't been updated. So I
know my firewall is broken but there's nothing I can find that tells me how to fix it.