1 files changed, 110 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/iptable_raw.c b/net/ipv4/netfilter/iptable_raw.c
new file mode 100644
index 000000000..ca5e5b215
--- /dev/null
+++ b/net/ipv4/netfilter/iptable_raw.c
@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 'raw' table, which is the very first hooked in at PRE_ROUTING and LOCAL_OUT .
+ *
+ * Copyright (C) 2003 Jozsef Kadlecsik <kadlec@netfilter.org>
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/slab.h>
+#include <net/ip.h>
+
+#define RAW_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT))
+
+static bool raw_before_defrag __read_mostly;
+MODULE_PARM_DESC(raw_before_defrag, "Enable raw table before defrag");
+module_param(raw_before_defrag, bool, 0000);
+
+static const struct xt_table packet_raw = {
+	.name = "raw",
+	.valid_hooks =  RAW_VALID_HOOKS,
+	.me = THIS_MODULE,
+	.af = NFPROTO_IPV4,
+	.priority = NF_IP_PRI_RAW,
+};
+
+static const struct xt_table packet_raw_before_defrag = {
+	.name = "raw",
+	.valid_hooks =  RAW_VALID_HOOKS,
+	.me = THIS_MODULE,
+	.af = NFPROTO_IPV4,
+	.priority = NF_IP_PRI_RAW_BEFORE_DEFRAG,
+};
+
+static struct nf_hook_ops *rawtable_ops __read_mostly;
+
+static int iptable_raw_table_init(struct net *net)
+{
+	struct ipt_replace *repl;
+	const struct xt_table *table = &packet_raw;
+	int ret;
+
+	if (raw_before_defrag)
+		table = &packet_raw_before_defrag;
+
+	repl = ipt_alloc_initial_table(table);
+	if (repl == NULL)
+		return -ENOMEM;
+	ret = ipt_register_table(net, table, repl, rawtable_ops);
+	kfree(repl);
+	return ret;
+}
+
+static void __net_exit iptable_raw_net_pre_exit(struct net *net)
+{
+	ipt_unregister_table_pre_exit(net, "raw");
+}
+
+static void __net_exit iptable_raw_net_exit(struct net *net)
+{
+	ipt_unregister_table_exit(net, "raw");
+}
+
+static struct pernet_operations iptable_raw_net_ops = {
+	.pre_exit = iptable_raw_net_pre_exit,
+	.exit = iptable_raw_net_exit,
+};
+
+static int __init iptable_raw_init(void)
+{
+	int ret;
+	const struct xt_table *table = &packet_raw;
+
+	if (raw_before_defrag) {
+		table = &packet_raw_before_defrag;
+
+		pr_info("Enabling raw table before defrag\n");
+	}
+
+	ret = xt_register_template(table,
+				   iptable_raw_table_init);
+	if (ret < 0)
+		return ret;
+
+	rawtable_ops = xt_hook_ops_alloc(table, ipt_do_table);
+	if (IS_ERR(rawtable_ops)) {
+		xt_unregister_template(table);
+		return PTR_ERR(rawtable_ops);
+	}
+
+	ret = register_pernet_subsys(&iptable_raw_net_ops);
+	if (ret < 0) {
+		xt_unregister_template(table);
+		kfree(rawtable_ops);
+		return ret;
+	}
+
+	return ret;
+}
+
+static void __exit iptable_raw_fini(void)
+{
+	unregister_pernet_subsys(&iptable_raw_net_ops);
+	kfree(rawtable_ops);
+	xt_unregister_template(&packet_raw);
+}
+
+module_init(iptable_raw_init);
+module_exit(iptable_raw_fini);
+MODULE_LICENSE("GPL");