netdev - Re: [PATCH 07/31] netfilter: ctnetlink: Support L3 protocol-filter on flush

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Message-ID: <a4f2df82-be23-ed46-79f5-749adc3c52c3@6wind.com>
Date:   Thu, 2 May 2019 10:27:17 +0200
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     Florian Westphal <fw@...len.de>
Cc:     Kristian Evensen <kristian.evensen@...il.com>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Netfilter Development Mailing list 
        <netfilter-devel@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH 07/31] netfilter: ctnetlink: Support L3 protocol-filter on
 flush

Le 02/05/2019 à 09:46, Florian Westphal a écrit :
> Nicolas Dichtel <nicolas.dichtel@...nd.com> wrote:
>> I understand your point, but this is a regression. Ignoring a field/attribute of
>> a netlink message is part of the uAPI. This field exists for more than a decade
>> (probably two), so you cannot just use it because nobody was using it. Just see
>> all discussions about strict validation of netlink messages.
>> Moreover, the conntrack tool exists also for ages and is an official tool.
> 
> FWIW I agree with Nicolas, we should restore old behaviour and flush
> everything when AF_INET is given.  We can add new netlink attr to
To avoid regression, we sould ignore it, AF_INET or not.

> restrict this.
Yes.