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 int __net_init
ip6table_filter_table_init(struct net
*net
);
27 static const struct xt_table packet_filter
= {
29 .valid_hooks
= FILTER_VALID_HOOKS
,
32 .priority
= NF_IP6_PRI_FILTER
,
33 .table_init
= ip6table_filter_table_init
,
36 /* The work comes in here from netfilter.c. */
38 ip6table_filter_hook(void *priv
, struct sk_buff
*skb
,
39 const struct nf_hook_state
*state
)
41 return ip6t_do_table(skb
, state
, state
->net
->ipv6
.ip6table_filter
);
44 static struct nf_hook_ops
*filter_ops __read_mostly
;
46 /* Default to forward because I got too much mail already. */
47 static bool forward
= true;
48 module_param(forward
, bool, 0000);
50 static int __net_init
ip6table_filter_table_init(struct net
*net
)
52 struct ip6t_replace
*repl
;
55 if (net
->ipv6
.ip6table_filter
)
58 repl
= ip6t_alloc_initial_table(&packet_filter
);
61 /* Entry 1 is the FORWARD hook */
62 ((struct ip6t_standard
*)repl
->entries
)[1].target
.verdict
=
63 forward
? -NF_ACCEPT
- 1 : -NF_DROP
- 1;
65 err
= ip6t_register_table(net
, &packet_filter
, repl
, filter_ops
,
66 &net
->ipv6
.ip6table_filter
);
71 static int __net_init
ip6table_filter_net_init(struct net
*net
)
73 if (net
== &init_net
|| !forward
)
74 return ip6table_filter_table_init(net
);
79 static void __net_exit
ip6table_filter_net_exit(struct net
*net
)
81 if (!net
->ipv6
.ip6table_filter
)
83 ip6t_unregister_table(net
, net
->ipv6
.ip6table_filter
, filter_ops
);
84 net
->ipv6
.ip6table_filter
= NULL
;
87 static struct pernet_operations ip6table_filter_net_ops
= {
88 .init
= ip6table_filter_net_init
,
89 .exit
= ip6table_filter_net_exit
,
92 static int __init
ip6table_filter_init(void)
96 filter_ops
= xt_hook_ops_alloc(&packet_filter
, ip6table_filter_hook
);
97 if (IS_ERR(filter_ops
))
98 return PTR_ERR(filter_ops
);
100 ret
= register_pernet_subsys(&ip6table_filter_net_ops
);
107 static void __exit
ip6table_filter_fini(void)
109 unregister_pernet_subsys(&ip6table_filter_net_ops
);
113 module_init(ip6table_filter_init
);
114 module_exit(ip6table_filter_fini
);