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Date:   Mon, 6 May 2019 00:32:29 +0200
From:   Pablo Neira Ayuso <>
To:     Kristian Evensen <>
Subject: Re: [PATCH] netfilter: ctnetlink: Resolve conntrack L3-protocol
 flush regression

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

Applied, thanks.

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