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

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Message-ID: <alpine.LSU.2.00.0902270414290.14912@fbirervta.pbzchgretzou.qr>
Date:	Fri, 27 Feb 2009 04:16:19 +0100 (CET)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Stephen Hemminger <shemminger@...tta.com>
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 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?

>+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.
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