Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
| 15 | |
| 16 | MODULE_LICENSE("GPL"); |
| 17 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); |
| 18 | MODULE_DESCRIPTION("ip6tables filter table"); |
| 19 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 20 | #define FILTER_VALID_HOOKS ((1 << NF_INET_LOCAL_IN) | \ |
| 21 | (1 << NF_INET_FORWARD) | \ |
| 22 | (1 << NF_INET_LOCAL_OUT)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
Jan Engelhardt | 35aad0f | 2009-08-24 14:56:30 +0200 | [diff] [blame] | 24 | static const struct xt_table packet_filter = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | .name = "filter", |
| 26 | .valid_hooks = FILTER_VALID_HOOKS, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | .me = THIS_MODULE, |
Jan Engelhardt | f88e6a8 | 2009-06-13 06:25:44 +0200 | [diff] [blame] | 28 | .af = NFPROTO_IPV6, |
Jan Engelhardt | 2b95efe | 2009-06-17 13:57:48 +0200 | [diff] [blame] | 29 | .priority = NF_IP6_PRI_FILTER, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | }; |
| 31 | |
| 32 | /* The work comes in here from netfilter.c. */ |
| 33 | static unsigned int |
Jan Engelhardt | 737535c | 2009-06-13 06:46:36 +0200 | [diff] [blame] | 34 | ip6table_filter_hook(unsigned int hook, struct sk_buff *skb, |
| 35 | const struct net_device *in, const struct net_device *out, |
| 36 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | { |
Jan Engelhardt | 2b21e05 | 2009-06-13 06:57:10 +0200 | [diff] [blame] | 38 | const struct net *net = dev_net((in != NULL) ? in : out); |
Jan Engelhardt | 737535c | 2009-06-13 06:46:36 +0200 | [diff] [blame] | 39 | |
Jan Engelhardt | 2b21e05 | 2009-06-13 06:57:10 +0200 | [diff] [blame] | 40 | return ip6t_do_table(skb, hook, in, out, net->ipv6.ip6table_filter); |
Alexey Dobriyan | 43de9dfe | 2008-07-08 02:36:18 -0700 | [diff] [blame] | 41 | } |
| 42 | |
Jan Engelhardt | 2b95efe | 2009-06-17 13:57:48 +0200 | [diff] [blame] | 43 | static struct nf_hook_ops *filter_ops __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
| 45 | /* Default to forward because I got too much mail already. */ |
| 46 | static int forward = NF_ACCEPT; |
| 47 | module_param(forward, bool, 0000); |
| 48 | |
Alexey Dobriyan | 8280aa6 | 2008-01-31 04:04:13 -0800 | [diff] [blame] | 49 | static int __net_init ip6table_filter_net_init(struct net *net) |
| 50 | { |
Jan Engelhardt | e3eaa99 | 2009-06-17 22:14:54 +0200 | [diff] [blame^] | 51 | struct ip6t_replace *repl; |
| 52 | |
| 53 | repl = ip6t_alloc_initial_table(&packet_filter); |
| 54 | if (repl == NULL) |
| 55 | return -ENOMEM; |
| 56 | /* Entry 1 is the FORWARD hook */ |
| 57 | ((struct ip6t_standard *)repl->entries)[1].target.verdict = |
| 58 | -forward - 1; |
| 59 | |
Alexey Dobriyan | 8280aa6 | 2008-01-31 04:04:13 -0800 | [diff] [blame] | 60 | net->ipv6.ip6table_filter = |
Jan Engelhardt | e3eaa99 | 2009-06-17 22:14:54 +0200 | [diff] [blame^] | 61 | ip6t_register_table(net, &packet_filter, repl); |
| 62 | kfree(repl); |
Alexey Dobriyan | 8280aa6 | 2008-01-31 04:04:13 -0800 | [diff] [blame] | 63 | if (IS_ERR(net->ipv6.ip6table_filter)) |
| 64 | return PTR_ERR(net->ipv6.ip6table_filter); |
| 65 | return 0; |
| 66 | } |
| 67 | |
| 68 | static void __net_exit ip6table_filter_net_exit(struct net *net) |
| 69 | { |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 70 | ip6t_unregister_table(net, net->ipv6.ip6table_filter); |
Alexey Dobriyan | 8280aa6 | 2008-01-31 04:04:13 -0800 | [diff] [blame] | 71 | } |
| 72 | |
| 73 | static struct pernet_operations ip6table_filter_net_ops = { |
| 74 | .init = ip6table_filter_net_init, |
| 75 | .exit = ip6table_filter_net_exit, |
| 76 | }; |
| 77 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 78 | static int __init ip6table_filter_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | { |
| 80 | int ret; |
| 81 | |
| 82 | if (forward < 0 || forward > NF_MAX_VERDICT) { |
| 83 | printk("iptables forward must be 0 or 1\n"); |
| 84 | return -EINVAL; |
| 85 | } |
| 86 | |
Alexey Dobriyan | 8280aa6 | 2008-01-31 04:04:13 -0800 | [diff] [blame] | 87 | ret = register_pernet_subsys(&ip6table_filter_net_ops); |
| 88 | if (ret < 0) |
| 89 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
| 91 | /* Register hooks */ |
Jan Engelhardt | 2b95efe | 2009-06-17 13:57:48 +0200 | [diff] [blame] | 92 | filter_ops = xt_hook_link(&packet_filter, ip6table_filter_hook); |
| 93 | if (IS_ERR(filter_ops)) { |
| 94 | ret = PTR_ERR(filter_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | goto cleanup_table; |
Jan Engelhardt | 2b95efe | 2009-06-17 13:57:48 +0200 | [diff] [blame] | 96 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | return ret; |
| 99 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | cleanup_table: |
Alexey Dobriyan | 8280aa6 | 2008-01-31 04:04:13 -0800 | [diff] [blame] | 101 | unregister_pernet_subsys(&ip6table_filter_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | return ret; |
| 103 | } |
| 104 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 105 | static void __exit ip6table_filter_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | { |
Jan Engelhardt | 2b95efe | 2009-06-17 13:57:48 +0200 | [diff] [blame] | 107 | xt_hook_unlink(&packet_filter, filter_ops); |
Alexey Dobriyan | 8280aa6 | 2008-01-31 04:04:13 -0800 | [diff] [blame] | 108 | unregister_pernet_subsys(&ip6table_filter_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | } |
| 110 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 111 | module_init(ip6table_filter_init); |
| 112 | module_exit(ip6table_filter_fini); |