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

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Date:   Mon, 6 May 2019 15:16:05 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc:     Kristian Evensen <kristian.evensen@...il.com>,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org
Subject: Re: [PATCH] netfilter: ctnetlink: Resolve conntrack L3-protocol
 flush regression

On Mon, May 06, 2019 at 10:49:52AM +0200, Nicolas Dichtel wrote:
> 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?

Sure, as soon as this hits Linus' tree.