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1da177e4 LT |
1 | /* |
2 | * This is the 1999 rewrite of IP Firewalling, aiming for kernel 2.3.x. | |
3 | * | |
4 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling | |
5 | * Copyright (C) 2000-2004 Netfilter Core Team <coreteam@netfilter.org> | |
6 | * | |
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. | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/moduleparam.h> | |
14 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
1da177e4 LT |
16 | |
17 | MODULE_LICENSE("GPL"); | |
18 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
19 | MODULE_DESCRIPTION("ip6tables filter table"); | |
20 | ||
6e23ae2a PM |
21 | #define FILTER_VALID_HOOKS ((1 << NF_INET_LOCAL_IN) | \ |
22 | (1 << NF_INET_FORWARD) | \ | |
23 | (1 << NF_INET_LOCAL_OUT)) | |
1da177e4 | 24 | |
35aad0ff | 25 | static const struct xt_table packet_filter = { |
1da177e4 LT |
26 | .name = "filter", |
27 | .valid_hooks = FILTER_VALID_HOOKS, | |
1da177e4 | 28 | .me = THIS_MODULE, |
f88e6a8a | 29 | .af = NFPROTO_IPV6, |
2b95efe7 | 30 | .priority = NF_IP6_PRI_FILTER, |
1da177e4 LT |
31 | }; |
32 | ||
33 | /* The work comes in here from netfilter.c. */ | |
34 | static unsigned int | |
737535c5 JE |
35 | ip6table_filter_hook(unsigned int hook, struct sk_buff *skb, |
36 | const struct net_device *in, const struct net_device *out, | |
37 | int (*okfn)(struct sk_buff *)) | |
43de9dfe | 38 | { |
2b21e051 | 39 | const struct net *net = dev_net((in != NULL) ? in : out); |
1da177e4 | 40 | |
2b21e051 | 41 | return ip6t_do_table(skb, hook, in, out, net->ipv6.ip6table_filter); |
1da177e4 LT |
42 | } |
43 | ||
2b95efe7 | 44 | static struct nf_hook_ops *filter_ops __read_mostly; |
1da177e4 LT |
45 | |
46 | /* Default to forward because I got too much mail already. */ | |
47 | static int forward = NF_ACCEPT; | |
48 | module_param(forward, bool, 0000); | |
49 | ||
8280aa61 AD |
50 | static int __net_init ip6table_filter_net_init(struct net *net) |
51 | { | |
e3eaa991 JE |
52 | struct ip6t_replace *repl; |
53 | ||
54 | repl = ip6t_alloc_initial_table(&packet_filter); | |
55 | if (repl == NULL) | |
56 | return -ENOMEM; | |
57 | /* Entry 1 is the FORWARD hook */ | |
58 | ((struct ip6t_standard *)repl->entries)[1].target.verdict = | |
59 | -forward - 1; | |
60 | ||
8280aa61 | 61 | net->ipv6.ip6table_filter = |
e3eaa991 JE |
62 | ip6t_register_table(net, &packet_filter, repl); |
63 | kfree(repl); | |
8280aa61 AD |
64 | if (IS_ERR(net->ipv6.ip6table_filter)) |
65 | return PTR_ERR(net->ipv6.ip6table_filter); | |
66 | return 0; | |
67 | } | |
68 | ||
69 | static void __net_exit ip6table_filter_net_exit(struct net *net) | |
70 | { | |
f54e9367 | 71 | ip6t_unregister_table(net, net->ipv6.ip6table_filter); |
8280aa61 AD |
72 | } |
73 | ||
74 | static struct pernet_operations ip6table_filter_net_ops = { | |
75 | .init = ip6table_filter_net_init, | |
76 | .exit = ip6table_filter_net_exit, | |
77 | }; | |
78 | ||
65b4b4e8 | 79 | static int __init ip6table_filter_init(void) |
1da177e4 LT |
80 | { |
81 | int ret; | |
82 | ||
83 | if (forward < 0 || forward > NF_MAX_VERDICT) { | |
84 | printk("iptables forward must be 0 or 1\n"); | |
85 | return -EINVAL; | |
86 | } | |
87 | ||
8280aa61 AD |
88 | ret = register_pernet_subsys(&ip6table_filter_net_ops); |
89 | if (ret < 0) | |
90 | return ret; | |
1da177e4 LT |
91 | |
92 | /* Register hooks */ | |
2b95efe7 JE |
93 | filter_ops = xt_hook_link(&packet_filter, ip6table_filter_hook); |
94 | if (IS_ERR(filter_ops)) { | |
95 | ret = PTR_ERR(filter_ops); | |
1da177e4 | 96 | goto cleanup_table; |
2b95efe7 | 97 | } |
1da177e4 | 98 | |
1da177e4 LT |
99 | return ret; |
100 | ||
1da177e4 | 101 | cleanup_table: |
8280aa61 | 102 | unregister_pernet_subsys(&ip6table_filter_net_ops); |
1da177e4 LT |
103 | return ret; |
104 | } | |
105 | ||
65b4b4e8 | 106 | static void __exit ip6table_filter_fini(void) |
1da177e4 | 107 | { |
2b95efe7 | 108 | xt_hook_unlink(&packet_filter, filter_ops); |
8280aa61 | 109 | unregister_pernet_subsys(&ip6table_filter_net_ops); |
1da177e4 LT |
110 | } |
111 | ||
65b4b4e8 AM |
112 | module_init(ip6table_filter_init); |
113 | module_exit(ip6table_filter_fini); |