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

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Date:   Mon, 29 Apr 2019 16:53:38 +0200
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     Pablo Neira Ayuso <pablo@...filter.org>
Cc:     netfilter-devel@...r.kernel.org,
        Kristian Evensen <kristian.evensen@...il.com>,
        davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH 07/31] netfilter: ctnetlink: Support L3 protocol-filter on
 flush

Le 26/04/2019 à 21:25, Pablo Neira Ayuso a écrit :
> On Thu, Apr 25, 2019 at 05:41:45PM +0200, Nicolas Dichtel wrote:
>> Le 25/04/2019 à 12:07, Nicolas Dichtel a écrit :
>> [snip]
>>> In fact, the conntrack tool set by default the family to AF_INET and forbid to
>>> set the family to something else (the '-f' option is not allowed for the command
>>> 'flush').
>>
>> 'conntrack -D -f ipv6' will do the job, but this is still a regression.
> 
> You mean, before this patch, flush was ignoring the family, and after
> Kristian's patch, it forces you to use NFPROTO_UNSPEC to achieve the
> same thing, right?
> 
Before the patch, flush was ignoring the family, and after the patch, the flush
takes care of the family.
The conntrack tool has always set the family to AF_INET by default, thus, since
this patch, only ipv4 conntracks are flushed with 'conntrack -F':
https://git.netfilter.org/conntrack-tools/tree/src/conntrack.c#n2565
https://git.netfilter.org/conntrack-tools/tree/src/conntrack.c#n2796


Regards,
Nicolas