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_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 dev_net(in)->ipv6.ip6table_filter);
75 ip6t_local_out_hook(unsigned int hook,
77 const struct net_device *in,
78 const struct net_device *out,
79 int (*okfn)(struct sk_buff *))
82 /* root is playing with raw sockets. */
83 if (skb->len < sizeof(struct iphdr)
84 || ip_hdrlen(skb) < sizeof(struct iphdr)) {
86 printk("ip6t_hook: happy cracking.\n");
91 return ip6t_do_table(skb, hook, in, out,
92 dev_net(out)->ipv6.ip6table_filter);
95 static struct nf_hook_ops ip6t_ops[] __read_mostly = {
100 .hooknum = NF_INET_LOCAL_IN,
101 .priority = NF_IP6_PRI_FILTER,
104 .hook = ip6t_in_hook,
105 .owner = THIS_MODULE,
107 .hooknum = NF_INET_FORWARD,
108 .priority = NF_IP6_PRI_FILTER,
111 .hook = ip6t_local_out_hook,
112 .owner = THIS_MODULE,
114 .hooknum = NF_INET_LOCAL_OUT,
115 .priority = NF_IP6_PRI_FILTER,
119 /* Default to forward because I got too much mail already. */
120 static int forward = NF_ACCEPT;
121 module_param(forward, bool, 0000);
123 static int __net_init ip6table_filter_net_init(struct net *net)
126 net->ipv6.ip6table_filter =
127 ip6t_register_table(net, &packet_filter, &initial_table.repl);
128 if (IS_ERR(net->ipv6.ip6table_filter))
129 return PTR_ERR(net->ipv6.ip6table_filter);
133 static void __net_exit ip6table_filter_net_exit(struct net *net)
135 ip6t_unregister_table(net->ipv6.ip6table_filter);
138 static struct pernet_operations ip6table_filter_net_ops = {
139 .init = ip6table_filter_net_init,
140 .exit = ip6table_filter_net_exit,
143 static int __init ip6table_filter_init(void)
147 if (forward < 0 || forward > NF_MAX_VERDICT) {
148 printk("iptables forward must be 0 or 1\n");
152 /* Entry 1 is the FORWARD hook */
153 initial_table.entries[1].target.verdict = -forward - 1;
155 ret = register_pernet_subsys(&ip6table_filter_net_ops);
160 ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
167 unregister_pernet_subsys(&ip6table_filter_net_ops);
171 static void __exit ip6table_filter_fini(void)
173 nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
174 unregister_pernet_subsys(&ip6table_filter_net_ops);
177 module_init(ip6table_filter_init);
178 module_exit(ip6table_filter_fini);