2 * This is the 1999 rewrite of IP Firewalling, aiming for kernel 2.3.x.
4 * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
5 * Copyright (C) 2000-2004 Netfilter Core Team <coreteam@netfilter.org>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/module.h>
13 #include <linux/moduleparam.h>
14 #include <linux/netfilter_ipv6/ip6_tables.h>
15 #include <linux/slab.h>
17 MODULE_LICENSE("GPL");
18 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
19 MODULE_DESCRIPTION("ip6tables filter table");
21 #define FILTER_VALID_HOOKS ((1 << NF_INET_LOCAL_IN) | \
22 (1 << NF_INET_FORWARD) | \
23 (1 << NF_INET_LOCAL_OUT))
25 static const struct xt_table packet_filter = {
27 .valid_hooks = FILTER_VALID_HOOKS,
30 .priority = NF_IP6_PRI_FILTER,
33 /* The work comes in here from netfilter.c. */
35 ip6table_filter_hook(const struct nf_hook_ops *ops, struct sk_buff *skb,
36 const struct nf_hook_state *state)
38 const struct net *net = dev_net(state->in ? state->in : state->out);
40 return ip6t_do_table(skb, ops->hooknum, state, net->ipv6.ip6table_filter);
43 static struct nf_hook_ops *filter_ops __read_mostly;
45 /* Default to forward because I got too much mail already. */
46 static bool forward = true;
47 module_param(forward, bool, 0000);
49 static int __net_init ip6table_filter_net_init(struct net *net)
51 struct ip6t_replace *repl;
53 repl = ip6t_alloc_initial_table(&packet_filter);
56 /* Entry 1 is the FORWARD hook */
57 ((struct ip6t_standard *)repl->entries)[1].target.verdict =
58 forward ? -NF_ACCEPT - 1 : -NF_DROP - 1;
60 net->ipv6.ip6table_filter =
61 ip6t_register_table(net, &packet_filter, repl);
63 return PTR_ERR_OR_ZERO(net->ipv6.ip6table_filter);
66 static void __net_exit ip6table_filter_net_exit(struct net *net)
68 ip6t_unregister_table(net, net->ipv6.ip6table_filter);
71 static struct pernet_operations ip6table_filter_net_ops = {
72 .init = ip6table_filter_net_init,
73 .exit = ip6table_filter_net_exit,
76 static int __init ip6table_filter_init(void)
80 ret = register_pernet_subsys(&ip6table_filter_net_ops);
85 filter_ops = xt_hook_link(&packet_filter, ip6table_filter_hook);
86 if (IS_ERR(filter_ops)) {
87 ret = PTR_ERR(filter_ops);
94 unregister_pernet_subsys(&ip6table_filter_net_ops);
98 static void __exit ip6table_filter_fini(void)
100 xt_hook_unlink(&packet_filter, filter_ops);
101 unregister_pernet_subsys(&ip6table_filter_net_ops);
104 module_init(ip6table_filter_init);
105 module_exit(ip6table_filter_fini);