1 files changed, 54 insertions, 0 deletions
diff --git a/net/netfilter/xt_realm.c b/net/netfilter/xt_realm.c
new file mode 100644
index 0000000..6741928
--- /dev/null
+++ b/net/netfilter/xt_realm.c
@@ -0,0 +1,54 @@
+/* IP tables module for matching the routing realm
+ *
+ * (C) 2003 by Sampsa Ranta <sampsa@netsonic.fi>
+ *
+ * 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/netdevice.h>
+#include <net/route.h>
+
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter/xt_realm.h>
+#include <linux/netfilter/x_tables.h>
+
+MODULE_AUTHOR("Sampsa Ranta <sampsa@netsonic.fi>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Xtables: Routing realm match");
+MODULE_ALIAS("ipt_realm");
+
+static bool
+realm_mt(const struct sk_buff *skb, const struct xt_match_param *par)
+{
+	const struct xt_realm_info *info = par->matchinfo;
+	const struct dst_entry *dst = skb->dst;
+
+	return (info->id == (dst->tclassid & info->mask)) ^ info->invert;
+}
+
+static struct xt_match realm_mt_reg __read_mostly = {
+	.name		= "realm",
+	.match		= realm_mt,
+	.matchsize	= sizeof(struct xt_realm_info),
+	.hooks		= (1 << NF_INET_POST_ROUTING) | (1 << NF_INET_FORWARD) |
+			  (1 << NF_INET_LOCAL_OUT) | (1 << NF_INET_LOCAL_IN),
+	.family		= NFPROTO_UNSPEC,
+	.me		= THIS_MODULE
+};
+
+static int __init realm_mt_init(void)
+{
+	return xt_register_match(&realm_mt_reg);
+}
+
+static void __exit realm_mt_exit(void)
+{
+	xt_unregister_match(&realm_mt_reg);
+}
+
+module_init(realm_mt_init);
+module_exit(realm_mt_exit);