1 files changed, 98 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/iptable_security.c b/net/ipv4/netfilter/iptable_security.c
new file mode 100644
index 000000000..d885443cb
--- /dev/null
+++ b/net/ipv4/netfilter/iptable_security.c
@@ -0,0 +1,98 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * "security" table
+ *
+ * This is for use by Mandatory Access Control (MAC) security models,
+ * which need to be able to manage security policy in separate context
+ * to DAC.
+ *
+ * Based on iptable_mangle.c
+ *
+ * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
+ * Copyright (C) 2000-2004 Netfilter Core Team <coreteam <at> netfilter.org>
+ * Copyright (C) 2008 Red Hat, Inc., James Morris <jmorris <at> redhat.com>
+ */
+#include <linux/module.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/slab.h>
+#include <net/ip.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>");
+MODULE_DESCRIPTION("iptables security table, for MAC rules");
+
+#define SECURITY_VALID_HOOKS	(1 << NF_INET_LOCAL_IN) | \
+				(1 << NF_INET_FORWARD) | \
+				(1 << NF_INET_LOCAL_OUT)
+
+static const struct xt_table security_table = {
+	.name		= "security",
+	.valid_hooks	= SECURITY_VALID_HOOKS,
+	.me		= THIS_MODULE,
+	.af		= NFPROTO_IPV4,
+	.priority	= NF_IP_PRI_SECURITY,
+};
+
+static struct nf_hook_ops *sectbl_ops __read_mostly;
+
+static int iptable_security_table_init(struct net *net)
+{
+	struct ipt_replace *repl;
+	int ret;
+
+	repl = ipt_alloc_initial_table(&security_table);
+	if (repl == NULL)
+		return -ENOMEM;
+	ret = ipt_register_table(net, &security_table, repl, sectbl_ops);
+	kfree(repl);
+	return ret;
+}
+
+static void __net_exit iptable_security_net_pre_exit(struct net *net)
+{
+	ipt_unregister_table_pre_exit(net, "security");
+}
+
+static void __net_exit iptable_security_net_exit(struct net *net)
+{
+	ipt_unregister_table_exit(net, "security");
+}
+
+static struct pernet_operations iptable_security_net_ops = {
+	.pre_exit = iptable_security_net_pre_exit,
+	.exit = iptable_security_net_exit,
+};
+
+static int __init iptable_security_init(void)
+{
+	int ret = xt_register_template(&security_table,
+				       iptable_security_table_init);
+
+	if (ret < 0)
+		return ret;
+
+	sectbl_ops = xt_hook_ops_alloc(&security_table, ipt_do_table);
+	if (IS_ERR(sectbl_ops)) {
+		xt_unregister_template(&security_table);
+		return PTR_ERR(sectbl_ops);
+	}
+
+	ret = register_pernet_subsys(&iptable_security_net_ops);
+	if (ret < 0) {
+		xt_unregister_template(&security_table);
+		kfree(sectbl_ops);
+		return ret;
+	}
+
+	return ret;
+}
+
+static void __exit iptable_security_fini(void)
+{
+	unregister_pernet_subsys(&iptable_security_net_ops);
+	kfree(sectbl_ops);
+	xt_unregister_template(&security_table);
+}
+
+module_init(iptable_security_init);
+module_exit(iptable_security_fini);