netdev - Re: [RFC] netfilter: WIP: Xtables idletimer target implementation

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Date:	Fri, 28 May 2010 12:58:44 +0300
From:	Luciano Coelho <luciano.coelho@...ia.com>
To:	ext Jan Engelhardt <jengelh@...ozas.de>
Cc:	"netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"kaber@...sh.net" <kaber@...sh.net>, Timo Teras <timo.teras@....fi>
Subject: Re: [RFC] netfilter: WIP: Xtables idletimer target implementation

On Fri, 2010-05-28 at 10:05 +0200, ext Jan Engelhardt wrote:
> On Friday 2010-05-28 07:25, Luciano Coelho wrote:
> >
> >Do you have any other suggestion on how I can associate the rules to
> >specific interfaces?
> 
> -A INPUT -i foo -j do
> -A do -j idletimer
> 
> A little funny, but actually this would allow me to keep a timer
> for a group of interfaces rather than just per-if.

Yes, this is what our userspace apps are doing.  I've formulated my
question in an unclear way.  If you check the rest of the code, I create
sysfs files under the interface's directory and use it as an attribute
to notify the userspace when the timer has expired.

In short, I need to figure out a way to associate each rule with an
interface in sysfs, so I can notify the userspace when the timer has
expired.  I couldn't figure out another way to do it.  Any suggestions?


> >> >+static int xt_idletimer_checkentry(const struct xt_tgchk_param *par)
> >> >+{
> >> >+	const struct xt_idletimer_info *info = par->targinfo;
> >> >+	const struct ipt_entry *entryinfo = par->entryinfo;
> >> >+	const struct ipt_ip *ip = &entryinfo->ip;
> >> 
> >> I'm not sure spying on ipt_ip is a long-term viable solution.
> >
> >Do you have any other suggestions on how I could get an interface
> >associated with the rule? I thought about having the userspace pass the
> >interface as an option to the rule (like I already do for the timeout
> >value), but that looked ugly to me, since the interface can already be
> >defined as part of the ruleset.
> 
> I have patches ready since a while that decouple ipt_ip
> from a rule, so there is no guarantee that such will exist.

Okay, if that's the case, then I don't know how to associate the rule
with a specific net object in the kobject tree.  Maybe I have to figure
out a different way to notify the userspace, unless I add the target
option I mentioned above. :/


-- 
Cheers,
Luca.

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