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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 15 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
| 17 | MODULE_LICENSE("GPL"); |
| 18 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); |
| 19 | MODULE_DESCRIPTION("ip6tables filter table"); |
| 20 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 21 | #define FILTER_VALID_HOOKS ((1 << NF_INET_LOCAL_IN) | \ |
| 22 | (1 << NF_INET_FORWARD) | \ |
| 23 | (1 << NF_INET_LOCAL_OUT)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
Jan Engelhardt | 35aad0f | 2009-08-24 14:56:30 +0200 | [diff] [blame] | 25 | static const struct xt_table packet_filter = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | .name = "filter", |
| 27 | .valid_hooks = FILTER_VALID_HOOKS, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | .me = THIS_MODULE, |
Jan Engelhardt | f88e6a8 | 2009-06-13 06:25:44 +0200 | [diff] [blame] | 29 | .af = NFPROTO_IPV6, |
Jan Engelhardt | 2b95efe | 2009-06-17 13:57:48 +0200 | [diff] [blame] | 30 | .priority = NF_IP6_PRI_FILTER, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | }; |
| 32 | |
| 33 | /* The work comes in here from netfilter.c. */ |
| 34 | static unsigned int |
Jan Engelhardt | 737535c | 2009-06-13 06:46:36 +0200 | [diff] [blame] | 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 *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | { |
Jan Engelhardt | 2b21e05 | 2009-06-13 06:57:10 +0200 | [diff] [blame] | 39 | const struct net *net = dev_net((in != NULL) ? in : out); |
Jan Engelhardt | 737535c | 2009-06-13 06:46:36 +0200 | [diff] [blame] | 40 | |
Jan Engelhardt | 2b21e05 | 2009-06-13 06:57:10 +0200 | [diff] [blame] | 41 | return ip6t_do_table(skb, hook, in, out, net->ipv6.ip6table_filter); |
Alexey Dobriyan | 43de9dfe | 2008-07-08 02:36:18 -0700 | [diff] [blame] | 42 | } |
| 43 | |
Jan Engelhardt | 2b95efe | 2009-06-17 13:57:48 +0200 | [diff] [blame] | 44 | static struct nf_hook_ops *filter_ops __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
| 46 | /* Default to forward because I got too much mail already. */ |
Rusty Russell | 523f610 | 2012-03-22 12:27:06 +0000 | [diff] [blame] | 47 | static bool forward = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | module_param(forward, bool, 0000); |
| 49 | |
Alexey Dobriyan | 8280aa6 | 2008-01-31 04:04:13 -0800 | [diff] [blame] | 50 | static int __net_init ip6table_filter_net_init(struct net *net) |
| 51 | { |
Jan Engelhardt | e3eaa99 | 2009-06-17 22:14:54 +0200 | [diff] [blame] | 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 = |
Rusty Russell | 523f610 | 2012-03-22 12:27:06 +0000 | [diff] [blame] | 59 | forward ? -NF_ACCEPT - 1 : -NF_DROP - 1; |
Jan Engelhardt | e3eaa99 | 2009-06-17 22:14:54 +0200 | [diff] [blame] | 60 | |
Alexey Dobriyan | 8280aa6 | 2008-01-31 04:04:13 -0800 | [diff] [blame] | 61 | net->ipv6.ip6table_filter = |
Jan Engelhardt | e3eaa99 | 2009-06-17 22:14:54 +0200 | [diff] [blame] | 62 | ip6t_register_table(net, &packet_filter, repl); |
| 63 | kfree(repl); |
Wu Fengguang | 19e303d | 2012-07-28 14:45:50 +0000 | [diff] [blame] | 64 | return PTR_RET(net->ipv6.ip6table_filter); |
Alexey Dobriyan | 8280aa6 | 2008-01-31 04:04:13 -0800 | [diff] [blame] | 65 | } |
| 66 | |
| 67 | static void __net_exit ip6table_filter_net_exit(struct net *net) |
| 68 | { |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 69 | ip6t_unregister_table(net, net->ipv6.ip6table_filter); |
Alexey Dobriyan | 8280aa6 | 2008-01-31 04:04:13 -0800 | [diff] [blame] | 70 | } |
| 71 | |
| 72 | static struct pernet_operations ip6table_filter_net_ops = { |
| 73 | .init = ip6table_filter_net_init, |
| 74 | .exit = ip6table_filter_net_exit, |
| 75 | }; |
| 76 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 77 | static int __init ip6table_filter_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | { |
| 79 | int ret; |
| 80 | |
Alexey Dobriyan | 8280aa6 | 2008-01-31 04:04:13 -0800 | [diff] [blame] | 81 | ret = register_pernet_subsys(&ip6table_filter_net_ops); |
| 82 | if (ret < 0) |
| 83 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
| 85 | /* Register hooks */ |
Jan Engelhardt | 2b95efe | 2009-06-17 13:57:48 +0200 | [diff] [blame] | 86 | filter_ops = xt_hook_link(&packet_filter, ip6table_filter_hook); |
| 87 | if (IS_ERR(filter_ops)) { |
| 88 | ret = PTR_ERR(filter_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | goto cleanup_table; |
Jan Engelhardt | 2b95efe | 2009-06-17 13:57:48 +0200 | [diff] [blame] | 90 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | return ret; |
| 93 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | cleanup_table: |
Alexey Dobriyan | 8280aa6 | 2008-01-31 04:04:13 -0800 | [diff] [blame] | 95 | unregister_pernet_subsys(&ip6table_filter_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | return ret; |
| 97 | } |
| 98 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 99 | static void __exit ip6table_filter_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | { |
Jan Engelhardt | 2b95efe | 2009-06-17 13:57:48 +0200 | [diff] [blame] | 101 | xt_hook_unlink(&packet_filter, filter_ops); |
Alexey Dobriyan | 8280aa6 | 2008-01-31 04:04:13 -0800 | [diff] [blame] | 102 | unregister_pernet_subsys(&ip6table_filter_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | } |
| 104 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 105 | module_init(ip6table_filter_init); |
| 106 | module_exit(ip6table_filter_fini); |