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>
16 MODULE_LICENSE("GPL");
17 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
18 MODULE_DESCRIPTION("ip6tables filter table");
20 #define FILTER_VALID_HOOKS ((1 << NF_INET_LOCAL_IN) | \
21 (1 << NF_INET_FORWARD) | \
22 (1 << NF_INET_LOCAL_OUT))
26 struct ip6t_replace repl
;
27 struct ip6t_standard entries
[3];
28 struct ip6t_error term
;
29 } initial_table __net_initdata
= {
32 .valid_hooks
= FILTER_VALID_HOOKS
,
34 .size
= sizeof(struct ip6t_standard
) * 3 + sizeof(struct ip6t_error
),
36 [NF_INET_LOCAL_IN
] = 0,
37 [NF_INET_FORWARD
] = sizeof(struct ip6t_standard
),
38 [NF_INET_LOCAL_OUT
] = sizeof(struct ip6t_standard
) * 2
41 [NF_INET_LOCAL_IN
] = 0,
42 [NF_INET_FORWARD
] = sizeof(struct ip6t_standard
),
43 [NF_INET_LOCAL_OUT
] = sizeof(struct ip6t_standard
) * 2
47 IP6T_STANDARD_INIT(NF_ACCEPT
), /* LOCAL_IN */
48 IP6T_STANDARD_INIT(NF_ACCEPT
), /* FORWARD */
49 IP6T_STANDARD_INIT(NF_ACCEPT
), /* LOCAL_OUT */
51 .term
= IP6T_ERROR_INIT
, /* ERROR */
54 static struct xt_table packet_filter
= {
56 .valid_hooks
= FILTER_VALID_HOOKS
,
57 .lock
= __RW_LOCK_UNLOCKED(packet_filter
.lock
),
62 /* The work comes in here from netfilter.c. */
64 ip6t_local_in_hook(unsigned int hook
,
66 const struct net_device
*in
,
67 const struct net_device
*out
,
68 int (*okfn
)(struct sk_buff
*))
70 return ip6t_do_table(skb
, hook
, in
, out
,
71 nf_local_in_net(in
, out
)->ipv6
.ip6table_filter
);
75 ip6t_forward_hook(unsigned int hook
,
77 const struct net_device
*in
,
78 const struct net_device
*out
,
79 int (*okfn
)(struct sk_buff
*))
81 return ip6t_do_table(skb
, hook
, in
, out
,
82 nf_forward_net(in
, out
)->ipv6
.ip6table_filter
);
86 ip6t_local_out_hook(unsigned int hook
,
88 const struct net_device
*in
,
89 const struct net_device
*out
,
90 int (*okfn
)(struct sk_buff
*))
93 /* root is playing with raw sockets. */
94 if (skb
->len
< sizeof(struct iphdr
)
95 || ip_hdrlen(skb
) < sizeof(struct iphdr
)) {
97 printk("ip6t_hook: happy cracking.\n");
102 return ip6t_do_table(skb
, hook
, in
, out
,
103 nf_local_out_net(in
, out
)->ipv6
.ip6table_filter
);
106 static struct nf_hook_ops ip6t_ops
[] __read_mostly
= {
108 .hook
= ip6t_local_in_hook
,
109 .owner
= THIS_MODULE
,
111 .hooknum
= NF_INET_LOCAL_IN
,
112 .priority
= NF_IP6_PRI_FILTER
,
115 .hook
= ip6t_forward_hook
,
116 .owner
= THIS_MODULE
,
118 .hooknum
= NF_INET_FORWARD
,
119 .priority
= NF_IP6_PRI_FILTER
,
122 .hook
= ip6t_local_out_hook
,
123 .owner
= THIS_MODULE
,
125 .hooknum
= NF_INET_LOCAL_OUT
,
126 .priority
= NF_IP6_PRI_FILTER
,
130 /* Default to forward because I got too much mail already. */
131 static int forward
= NF_ACCEPT
;
132 module_param(forward
, bool, 0000);
134 static int __net_init
ip6table_filter_net_init(struct net
*net
)
137 net
->ipv6
.ip6table_filter
=
138 ip6t_register_table(net
, &packet_filter
, &initial_table
.repl
);
139 if (IS_ERR(net
->ipv6
.ip6table_filter
))
140 return PTR_ERR(net
->ipv6
.ip6table_filter
);
144 static void __net_exit
ip6table_filter_net_exit(struct net
*net
)
146 ip6t_unregister_table(net
->ipv6
.ip6table_filter
);
149 static struct pernet_operations ip6table_filter_net_ops
= {
150 .init
= ip6table_filter_net_init
,
151 .exit
= ip6table_filter_net_exit
,
154 static int __init
ip6table_filter_init(void)
158 if (forward
< 0 || forward
> NF_MAX_VERDICT
) {
159 printk("iptables forward must be 0 or 1\n");
163 /* Entry 1 is the FORWARD hook */
164 initial_table
.entries
[1].target
.verdict
= -forward
- 1;
166 ret
= register_pernet_subsys(&ip6table_filter_net_ops
);
171 ret
= nf_register_hooks(ip6t_ops
, ARRAY_SIZE(ip6t_ops
));
178 unregister_pernet_subsys(&ip6table_filter_net_ops
);
182 static void __exit
ip6table_filter_fini(void)
184 nf_unregister_hooks(ip6t_ops
, ARRAY_SIZE(ip6t_ops
));
185 unregister_pernet_subsys(&ip6table_filter_net_ops
);
188 module_init(ip6table_filter_init
);
189 module_exit(ip6table_filter_fini
);