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

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Date:	Fri, 28 May 2010 10:05:56 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Luciano Coelho <luciano.coelho@...ia.com>
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 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.

>> >+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.
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