netdev - Re: [PATCH] netfilter: ctnetlink: Resolve conntrack L3-protocol flush regression

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Date:   Mon, 6 May 2019 10:49:52 +0200
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     Pablo Neira Ayuso <pablo@...filter.org>,
        Kristian Evensen <kristian.evensen@...il.com>
Cc:     netdev@...r.kernel.org, netfilter-devel@...r.kernel.org
Subject: Re: [PATCH] netfilter: ctnetlink: Resolve conntrack L3-protocol flush
 regression

Le 06/05/2019 à 00:32, Pablo Neira Ayuso a écrit :
> On Fri, May 03, 2019 at 05:40:07PM +0200, Kristian Evensen wrote:
>> Commit 59c08c69c278 ("netfilter: ctnetlink: Support L3 protocol-filter
>> on flush") introduced a user-space regression when flushing connection
>> track entries. Before this commit, the nfgen_family field was not used
>> by the kernel and all entries were removed. Since this commit,
>> nfgen_family is used to filter out entries that should not be removed.
>> One example a broken tool is conntrack. conntrack always sets
>> nfgen_family to AF_INET, so after 59c08c69c278 only IPv4 entries were
>> removed with the -F parameter.
>>
>> Pablo Neira Ayuso suggested using nfgenmsg->version to resolve the
>> regression, and this commit implements his suggestion. nfgenmsg->version
>> is so far set to zero, so it is well-suited to be used as a flag for
>> selecting old or new flush behavior. If version is 0, nfgen_family is
>> ignored and all entries are used. If user-space sets the version to one
>> (or any other value than 0), then the new behavior is used. As version
>> only can have two valid values, I chose not to add a new
>> NFNETLINK_VERSION-constant.
> 
> Applied, thanks.
> 
Thank you.
Is it possible to queue this for stable?


Regards,
Nicolas