Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / ipv6 / netfilter / ip6table_filter.c

diff --git a/kernel/net/ipv6/netfilter/ip6table_filter.c b/kernel/net/ipv6/netfilter/ip6table_filter.c
new file mode 100644 (file)
index 0000000..5c33d8a
--- /dev/null
+++ b/kernel/net/ipv6/netfilter/ip6table_filter.c
@@ -0,0 +1,105 @@
+/*
+ * This is the 1999 rewrite of IP Firewalling, aiming for kernel 2.3.x.
+ *
+ * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
+ * Copyright (C) 2000-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * 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/moduleparam.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/slab.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("ip6tables filter table");
+
+#define FILTER_VALID_HOOKS ((1 << NF_INET_LOCAL_IN) | \
+                           (1 << NF_INET_FORWARD) | \
+                           (1 << NF_INET_LOCAL_OUT))
+
+static const struct xt_table packet_filter = {
+       .name           = "filter",
+       .valid_hooks    = FILTER_VALID_HOOKS,
+       .me             = THIS_MODULE,
+       .af             = NFPROTO_IPV6,
+       .priority       = NF_IP6_PRI_FILTER,
+};
+
+/* The work comes in here from netfilter.c. */
+static unsigned int
+ip6table_filter_hook(const struct nf_hook_ops *ops, struct sk_buff *skb,
+                    const struct nf_hook_state *state)
+{
+       const struct net *net = dev_net(state->in ? state->in : state->out);
+
+       return ip6t_do_table(skb, ops->hooknum, state, net->ipv6.ip6table_filter);
+}
+
+static struct nf_hook_ops *filter_ops __read_mostly;
+
+/* Default to forward because I got too much mail already. */
+static bool forward = true;
+module_param(forward, bool, 0000);
+
+static int __net_init ip6table_filter_net_init(struct net *net)
+{
+       struct ip6t_replace *repl;
+
+       repl = ip6t_alloc_initial_table(&packet_filter);
+       if (repl == NULL)
+               return -ENOMEM;
+       /* Entry 1 is the FORWARD hook */
+       ((struct ip6t_standard *)repl->entries)[1].target.verdict =
+               forward ? -NF_ACCEPT - 1 : -NF_DROP - 1;
+
+       net->ipv6.ip6table_filter =
+               ip6t_register_table(net, &packet_filter, repl);
+       kfree(repl);
+       return PTR_ERR_OR_ZERO(net->ipv6.ip6table_filter);
+}
+
+static void __net_exit ip6table_filter_net_exit(struct net *net)
+{
+       ip6t_unregister_table(net, net->ipv6.ip6table_filter);
+}
+
+static struct pernet_operations ip6table_filter_net_ops = {
+       .init = ip6table_filter_net_init,
+       .exit = ip6table_filter_net_exit,
+};
+
+static int __init ip6table_filter_init(void)
+{
+       int ret;
+
+       ret = register_pernet_subsys(&ip6table_filter_net_ops);
+       if (ret < 0)
+               return ret;
+
+       /* Register hooks */
+       filter_ops = xt_hook_link(&packet_filter, ip6table_filter_hook);
+       if (IS_ERR(filter_ops)) {
+               ret = PTR_ERR(filter_ops);
+               goto cleanup_table;
+       }
+
+       return ret;
+
+ cleanup_table:
+       unregister_pernet_subsys(&ip6table_filter_net_ops);
+       return ret;
+}
+
+static void __exit ip6table_filter_fini(void)
+{
+       xt_hook_unlink(&packet_filter, filter_ops);
+       unregister_pernet_subsys(&ip6table_filter_net_ops);
+}
+
+module_init(ip6table_filter_init);
+module_exit(ip6table_filter_fini);