linux-kernel - Re: [PATCH V2 2/2] netfilter: ctnetlink: Fix regression in CTA

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Message-ID: <20170206114443.GB15498@salvia>
Date:   Mon, 6 Feb 2017 12:44:43 +0100
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Kevin Cernekee <cernekee@...omium.org>
Cc:     dianders@...omium.org, davem@...emloft.net,
        netfilter-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 2/2] netfilter: ctnetlink: Fix regression in CTA_HELP
 processing

On Thu, Jan 26, 2017 at 02:49:44PM -0800, Kevin Cernekee wrote:
> Prior to Linux 4.4, it was usually harmless to send a CTA_HELP attribute
> containing the name of the current helper.  That is no longer the case:
> as of Linux 4.4, if ctnetlink_change_helper() returns an error from
> the ct->master check, processing of the request will fail, skipping the
> NFQA_EXP attribute (if present).
> 
> This patch changes the behavior to improve compatibility with user
> programs that expect the kernel interface to work the way it did prior
> to Linux 4.4.  If a user program specifies CTA_HELP but the argument
> matches the current conntrack helper name, ignore it instead of generating
> an error.

Also applied, thanks Kevin.