1 files changed, 118 insertions, 0 deletions
diff --git a/net/bridge/netfilter/ebtable_filter.c b/net/bridge/netfilter/ebtable_filter.c
new file mode 100644
index 000000000..278f324e6
--- /dev/null
+++ b/net/bridge/netfilter/ebtable_filter.c
@@ -0,0 +1,118 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  ebtable_filter
+ *
+ *	Authors:
+ *	Bart De Schuymer <bdschuym@pandora.be>
+ *
+ *  April, 2002
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <uapi/linux/netfilter_bridge.h>
+#include <linux/module.h>
+
+#define FILTER_VALID_HOOKS ((1 << NF_BR_LOCAL_IN) | (1 << NF_BR_FORWARD) | \
+			    (1 << NF_BR_LOCAL_OUT))
+
+static struct ebt_entries initial_chains[] = {
+	{
+		.name	= "INPUT",
+		.policy	= EBT_ACCEPT,
+	},
+	{
+		.name	= "FORWARD",
+		.policy	= EBT_ACCEPT,
+	},
+	{
+		.name	= "OUTPUT",
+		.policy	= EBT_ACCEPT,
+	},
+};
+
+static struct ebt_replace_kernel initial_table = {
+	.name		= "filter",
+	.valid_hooks	= FILTER_VALID_HOOKS,
+	.entries_size	= 3 * sizeof(struct ebt_entries),
+	.hook_entry	= {
+		[NF_BR_LOCAL_IN]	= &initial_chains[0],
+		[NF_BR_FORWARD]		= &initial_chains[1],
+		[NF_BR_LOCAL_OUT]	= &initial_chains[2],
+	},
+	.entries	= (char *)initial_chains,
+};
+
+static const struct ebt_table frame_filter = {
+	.name		= "filter",
+	.table		= &initial_table,
+	.valid_hooks	= FILTER_VALID_HOOKS,
+	.me		= THIS_MODULE,
+};
+
+static const struct nf_hook_ops ebt_ops_filter[] = {
+	{
+		.hook		= ebt_do_table,
+		.pf		= NFPROTO_BRIDGE,
+		.hooknum	= NF_BR_LOCAL_IN,
+		.priority	= NF_BR_PRI_FILTER_BRIDGED,
+	},
+	{
+		.hook		= ebt_do_table,
+		.pf		= NFPROTO_BRIDGE,
+		.hooknum	= NF_BR_FORWARD,
+		.priority	= NF_BR_PRI_FILTER_BRIDGED,
+	},
+	{
+		.hook		= ebt_do_table,
+		.pf		= NFPROTO_BRIDGE,
+		.hooknum	= NF_BR_LOCAL_OUT,
+		.priority	= NF_BR_PRI_FILTER_OTHER,
+	},
+};
+
+static int frame_filter_table_init(struct net *net)
+{
+	return ebt_register_table(net, &frame_filter, ebt_ops_filter);
+}
+
+static void __net_exit frame_filter_net_pre_exit(struct net *net)
+{
+	ebt_unregister_table_pre_exit(net, "filter");
+}
+
+static void __net_exit frame_filter_net_exit(struct net *net)
+{
+	ebt_unregister_table(net, "filter");
+}
+
+static struct pernet_operations frame_filter_net_ops = {
+	.exit = frame_filter_net_exit,
+	.pre_exit = frame_filter_net_pre_exit,
+};
+
+static int __init ebtable_filter_init(void)
+{
+	int ret = ebt_register_template(&frame_filter, frame_filter_table_init);
+
+	if (ret)
+		return ret;
+
+	ret = register_pernet_subsys(&frame_filter_net_ops);
+	if (ret) {
+		ebt_unregister_template(&frame_filter);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void __exit ebtable_filter_fini(void)
+{
+	unregister_pernet_subsys(&frame_filter_net_ops);
+	ebt_unregister_template(&frame_filter);
+}
+
+module_init(ebtable_filter_init);
+module_exit(ebtable_filter_fini);
+MODULE_LICENSE("GPL");