linux-kernel - Re: [PATCH 1/2 iptables] libxt_cgroup: prepare for multi revisions

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Message-ID: <20151122203447.GA3267@salvia>
Date:	Sun, 22 Nov 2015 21:34:47 +0100
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	davem@...emloft.net, kaber@...sh.net, kadlec@...ckhole.kfki.hu,
	daniel@...earbox.net, daniel.wagner@...-carit.de,
	nhorman@...driver.com, lizefan@...wei.com, hannes@...xchg.org,
	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
	coreteam@...filter.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-team@...com, ninasc@...com
Subject: Re: [PATCH 1/2 iptables] libxt_cgroup: prepare for multi revisions

On Sun, Nov 22, 2015 at 09:31:28PM +0100, Pablo Neira Ayuso wrote:
> On Sat, Nov 21, 2015 at 11:18:46AM -0500, Tejun Heo wrote:
> > --- a/extensions/libxt_cgroup.c
> > +++ b/extensions/libxt_cgroup.c
> > @@ -3,30 +3,30 @@
> >  #include <linux/netfilter/xt_cgroup.h>
> >  
> >  enum {
> > -	O_CGROUP = 0,
> > +	O_CLASSID = 0,
> >  };
> >  
> > -static void cgroup_help(void)
> > +static void cgroup_help_v0(void)
> >  {
> >  	printf(
> >  "cgroup match options:\n"
> > -"[!] --cgroup fwid  Match cgroup fwid\n");
> > +"[!] --cgroup classid            Match cgroup classid\n");
> 
> We have to keep the old cgroup integer ID around for a while,
> otherwise we'll break users with old kernels and new iptables
> utilities.

Oh, I see.

This is just a rename to prepare the string based identifier.

Sorry for the noise.
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