1 files changed, 99 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/ipt_iprange.c b/net/ipv4/netfilter/ipt_iprange.c
new file mode 100644
index 00000000000..b835b7b2e56
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_iprange.c
@@ -0,0 +1,99 @@
+/*
+ * iptables 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_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_iprange.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
+MODULE_DESCRIPTION("iptables arbitrary IP range match module");
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset, int *hotdrop)
+{
+	const struct ipt_iprange_info *info = matchinfo;
+	const struct iphdr *iph = skb->nh.iph;
+
+	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)) {
+			DEBUGP("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 0;
+		}
+	}
+	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)) {
+			DEBUGP("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 0;
+		}
+	}
+	return 1;
+}
+
+static int check(const char *tablename,
+		 const struct ipt_ip *ip,
+		 void *matchinfo,
+		 unsigned int matchsize,
+		 unsigned int hook_mask)
+{
+	/* verify size */
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_iprange_info)))
+		return 0;
+
+	return 1;
+}
+
+static struct ipt_match iprange_match = 
+{ 
+	.list = { NULL, NULL }, 
+	.name = "iprange", 
+	.match = &match, 
+	.checkentry = &check, 
+	.destroy = NULL, 
+	.me = THIS_MODULE
+};
+
+static int __init init(void)
+{
+	return ipt_register_match(&iprange_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&iprange_match);
+}
+
+module_init(init);
+module_exit(fini);