[NETFILTER]: Rename ipt_iprange to xt_iprange

This patch moves ipt_iprange to xt_iprange, in preparation for adding
IPv6 support to xt_iprange.

Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 88 insertions, 0 deletions

diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 79d71437e31..daf5b881064 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -567,6 +567,17 @@ config NETFILTER_XT_MATCH_HELPER
 
 	  To compile it as a module, choose M here.  If unsure, say Y.
 
+config NETFILTER_XT_MATCH_IPRANGE
+	tristate '"iprange" address range match support'
+	depends on NETFILTER_XTABLES
+	depends on NETFILTER_ADVANCED
+	---help---
+	This option adds a "iprange" match, which allows you to match based on
+	an IP address range. (Normal iptables only matches on single addresses
+	with an optional mask.)
+
+	If unsure, say M.
+
 config NETFILTER_XT_MATCH_LENGTH
 	tristate '"length" match support'
 	depends on NETFILTER_XTABLES
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 3b9ea8fb3a0..c910caee0d4 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -63,6 +63,7 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_DSCP) += xt_dscp.o
 obj-$(CONFIG_NETFILTER_XT_MATCH_ESP) += xt_esp.o
 obj-$(CONFIG_NETFILTER_XT_MATCH_HASHLIMIT) += xt_hashlimit.o
 obj-$(CONFIG_NETFILTER_XT_MATCH_HELPER) += xt_helper.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_IPRANGE) += xt_iprange.o
 obj-$(CONFIG_NETFILTER_XT_MATCH_LENGTH) += xt_length.o
 obj-$(CONFIG_NETFILTER_XT_MATCH_LIMIT) += xt_limit.o
 obj-$(CONFIG_NETFILTER_XT_MATCH_MAC) += xt_mac.o
diff --git a/net/netfilter/xt_iprange.c b/net/netfilter/xt_iprange.c
new file mode 100644
index 00000000000..c57a6cf8a08
--- /dev/null
+++ b/net/netfilter/xt_iprange.c
@@ -0,0 +1,76 @@
+/*
+ *	xt_iprange - Netfilter module to match IP address ranges
+ *
+ *	(C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
+ *
+ *	This program is free software; you can redistribute it and/or modify
+ *	it under the terms of the GNU General Public License version 2 as
+ *	published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_ipv4/ipt_iprange.h>
+
+static bool
+iprange_mt_v0(const struct sk_buff *skb, const struct net_device *in,
+              const struct net_device *out, const struct xt_match *match,
+              const void *matchinfo, int offset, unsigned int protoff,
+              bool *hotdrop)
+{
+	const struct ipt_iprange_info *info = matchinfo;
+	const struct iphdr *iph = ip_hdr(skb);
+
+	if (info->flags & IPRANGE_SRC) {
+		if ((ntohl(iph->saddr) < ntohl(info->src.min_ip)
+			  || ntohl(iph->saddr) > ntohl(info->src.max_ip))
+			 ^ !!(info->flags & IPRANGE_SRC_INV)) {
+			pr_debug("src IP %u.%u.%u.%u NOT in range %s"
+				 "%u.%u.%u.%u-%u.%u.%u.%u\n",
+				 NIPQUAD(iph->saddr),
+				 info->flags & IPRANGE_SRC_INV ? "(INV) " : "",
+				 NIPQUAD(info->src.min_ip),
+				 NIPQUAD(info->src.max_ip));
+			return false;
+		}
+	}
+	if (info->flags & IPRANGE_DST) {
+		if ((ntohl(iph->daddr) < ntohl(info->dst.min_ip)
+			  || ntohl(iph->daddr) > ntohl(info->dst.max_ip))
+			 ^ !!(info->flags & IPRANGE_DST_INV)) {
+			pr_debug("dst IP %u.%u.%u.%u NOT in range %s"
+				 "%u.%u.%u.%u-%u.%u.%u.%u\n",
+				 NIPQUAD(iph->daddr),
+				 info->flags & IPRANGE_DST_INV ? "(INV) " : "",
+				 NIPQUAD(info->dst.min_ip),
+				 NIPQUAD(info->dst.max_ip));
+			return false;
+		}
+	}
+	return true;
+}
+
+static struct xt_match iprange_mt_reg __read_mostly = {
+	.name		= "iprange",
+	.family		= AF_INET,
+	.match		= iprange_mt_v0,
+	.matchsize	= sizeof(struct ipt_iprange_info),
+	.me		= THIS_MODULE
+};
+
+static int __init iprange_mt_init(void)
+{
+	return xt_register_match(&iprange_mt_reg);
+}
+
+static void __exit iprange_mt_exit(void)
+{
+	xt_unregister_match(&iprange_mt_reg);
+}
+
+module_init(iprange_mt_init);
+module_exit(iprange_mt_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
+MODULE_DESCRIPTION("Xtables: arbitrary IPv4 range matching");