netdev - Re: [PATCH] iptables: new strict host model match

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Date:	Thu, 26 Feb 2009 19:23:53 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Jan Engelhardt <jengelh@...ozas.de>
Cc:	Patrick McHardy <kaber@...sh.net>,
	David Miller <davem@...emloft.net>,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] iptables: new strict host model match

On Fri, 27 Feb 2009 04:16:19 +0100 (CET)
Jan Engelhardt <jengelh@...ozas.de> wrote:

> 
> On Friday 2009-02-27 02:52, Stephen Hemminger wrote:
> >+static bool strict_mt(const struct sk_buff *skb, const struct xt_match_param *par)
> >+{
> >+	struct in_device *in_dev;
> >+	bool ret;
> >+
> >+	rcu_read_lock();
> >+	in_dev = __in_dev_get_rcu(skb->dev);
> >+	ret = (in_dev && inet_addr_onlink(in_dev, ip_hdr(skb)->daddr, 0));
> >+	rcu_read_unlock();
> >+
> >+	return ret;
> >+}
> 
> This looks easy enough to also do for IPv6. Would you?

IPV6 already does this.

> 
> >+static struct xt_match strict_mt_reg __read_mostly = {
> >+	.name		= "strict",
> >+	.family		= NFPROTO_IPV4,
> >+	.match		= strict_mt,
> >+	.matchsize	= 0,
> >+	.me		= THIS_MODULE,
> >+};
> 
> The match seems to make the most sense where an input device
> is available, so
> 
> 	.hooks = (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_IN) |
> 	         (1 << NF_INET_FORWARD)
> 
> should probably be added.

Then routing wouldn't work...
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