# Re: \[PATCH 1/2 iptables\] libxt\_cgroup: prepare for multi revisions

- From: Pablo Neira Ayuso \<hidden\>
- Date: 2015-11-22 20:34:54 
- List: netdev
- Page: https://ratatoskr.run/netdev/2015/11/4625958
- Thread: https://ratatoskr.run/netdev/2015/11/4625692/t.md

```text
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.
```