From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 net/bridge/netfilter/ebtable_filter.c | 136 ++++++++++++++++++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 net/bridge/netfilter/ebtable_filter.c

(limited to 'net/bridge/netfilter/ebtable_filter.c')

diff --git a/net/bridge/netfilter/ebtable_filter.c b/net/bridge/netfilter/ebtable_filter.c
new file mode 100644
index 000000000..8a3f63b2e
--- /dev/null
+++ b/net/bridge/netfilter/ebtable_filter.c
@@ -0,0 +1,136 @@
+/*
+ *  ebtable_filter
+ *
+ *	Authors:
+ *	Bart De Schuymer <bdschuym@pandora.be>
+ *
+ *  April, 2002
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.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 int check(const struct ebt_table_info *info, unsigned int valid_hooks)
+{
+	if (valid_hooks & ~FILTER_VALID_HOOKS)
+		return -EINVAL;
+	return 0;
+}
+
+static const struct ebt_table frame_filter = {
+	.name		= "filter",
+	.table		= &initial_table,
+	.valid_hooks	= FILTER_VALID_HOOKS,
+	.check		= check,
+	.me		= THIS_MODULE,
+};
+
+static unsigned int
+ebt_in_hook(const struct nf_hook_ops *ops, struct sk_buff *skb,
+	    const struct nf_hook_state *state)
+{
+	return ebt_do_table(ops->hooknum, skb, state->in, state->out,
+			    dev_net(state->in)->xt.frame_filter);
+}
+
+static unsigned int
+ebt_out_hook(const struct nf_hook_ops *ops, struct sk_buff *skb,
+	     const struct nf_hook_state *state)
+{
+	return ebt_do_table(ops->hooknum, skb, state->in, state->out,
+			    dev_net(state->out)->xt.frame_filter);
+}
+
+static struct nf_hook_ops ebt_ops_filter[] __read_mostly = {
+	{
+		.hook		= ebt_in_hook,
+		.owner		= THIS_MODULE,
+		.pf		= NFPROTO_BRIDGE,
+		.hooknum	= NF_BR_LOCAL_IN,
+		.priority	= NF_BR_PRI_FILTER_BRIDGED,
+	},
+	{
+		.hook		= ebt_in_hook,
+		.owner		= THIS_MODULE,
+		.pf		= NFPROTO_BRIDGE,
+		.hooknum	= NF_BR_FORWARD,
+		.priority	= NF_BR_PRI_FILTER_BRIDGED,
+	},
+	{
+		.hook		= ebt_out_hook,
+		.owner		= THIS_MODULE,
+		.pf		= NFPROTO_BRIDGE,
+		.hooknum	= NF_BR_LOCAL_OUT,
+		.priority	= NF_BR_PRI_FILTER_OTHER,
+	},
+};
+
+static int __net_init frame_filter_net_init(struct net *net)
+{
+	net->xt.frame_filter = ebt_register_table(net, &frame_filter);
+	return PTR_ERR_OR_ZERO(net->xt.frame_filter);
+}
+
+static void __net_exit frame_filter_net_exit(struct net *net)
+{
+	ebt_unregister_table(net, net->xt.frame_filter);
+}
+
+static struct pernet_operations frame_filter_net_ops = {
+	.init = frame_filter_net_init,
+	.exit = frame_filter_net_exit,
+};
+
+static int __init ebtable_filter_init(void)
+{
+	int ret;
+
+	ret = register_pernet_subsys(&frame_filter_net_ops);
+	if (ret < 0)
+		return ret;
+	ret = nf_register_hooks(ebt_ops_filter, ARRAY_SIZE(ebt_ops_filter));
+	if (ret < 0)
+		unregister_pernet_subsys(&frame_filter_net_ops);
+	return ret;
+}
+
+static void __exit ebtable_filter_fini(void)
+{
+	nf_unregister_hooks(ebt_ops_filter, ARRAY_SIZE(ebt_ops_filter));
+	unregister_pernet_subsys(&frame_filter_net_ops);
+}
+
+module_init(ebtable_filter_init);
+module_exit(ebtable_filter_fini);
+MODULE_LICENSE("GPL");
-- 
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