114 lines
3.0 KiB
C
114 lines
3.0 KiB
C
/*
|
|
* This is the 1999 rewrite of IP Firewalling, aiming for kernel 2.3.x.
|
|
*
|
|
* Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
|
|
* Copyright (C) 2000-2004 Netfilter Core Team <coreteam@netfilter.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/netfilter_ipv6/ip6_tables.h>
|
|
#include <linux/slab.h>
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
|
|
MODULE_DESCRIPTION("ip6tables filter table");
|
|
|
|
#define FILTER_VALID_HOOKS ((1 << NF_INET_LOCAL_IN) | \
|
|
(1 << NF_INET_FORWARD) | \
|
|
(1 << NF_INET_LOCAL_OUT))
|
|
|
|
static const struct xt_table packet_filter = {
|
|
.name = "filter",
|
|
.valid_hooks = FILTER_VALID_HOOKS,
|
|
.me = THIS_MODULE,
|
|
.af = NFPROTO_IPV6,
|
|
.priority = NF_IP6_PRI_FILTER,
|
|
};
|
|
|
|
/* The work comes in here from netfilter.c. */
|
|
static unsigned int
|
|
ip6table_filter_hook(unsigned int hook, struct sk_buff *skb,
|
|
const struct net_device *in, const struct net_device *out,
|
|
int (*okfn)(struct sk_buff *))
|
|
{
|
|
const struct net *net = dev_net((in != NULL) ? in : out);
|
|
|
|
return ip6t_do_table(skb, hook, in, out, net->ipv6.ip6table_filter);
|
|
}
|
|
|
|
static struct nf_hook_ops *filter_ops __read_mostly;
|
|
|
|
/* Default to forward because I got too much mail already. */
|
|
static int forward = NF_ACCEPT;
|
|
module_param(forward, bool, 0000);
|
|
|
|
static int __net_init ip6table_filter_net_init(struct net *net)
|
|
{
|
|
struct ip6t_replace *repl;
|
|
|
|
repl = ip6t_alloc_initial_table(&packet_filter);
|
|
if (repl == NULL)
|
|
return -ENOMEM;
|
|
/* Entry 1 is the FORWARD hook */
|
|
((struct ip6t_standard *)repl->entries)[1].target.verdict =
|
|
-forward - 1;
|
|
|
|
net->ipv6.ip6table_filter =
|
|
ip6t_register_table(net, &packet_filter, repl);
|
|
kfree(repl);
|
|
if (IS_ERR(net->ipv6.ip6table_filter))
|
|
return PTR_ERR(net->ipv6.ip6table_filter);
|
|
return 0;
|
|
}
|
|
|
|
static void __net_exit ip6table_filter_net_exit(struct net *net)
|
|
{
|
|
ip6t_unregister_table(net, net->ipv6.ip6table_filter);
|
|
}
|
|
|
|
static struct pernet_operations ip6table_filter_net_ops = {
|
|
.init = ip6table_filter_net_init,
|
|
.exit = ip6table_filter_net_exit,
|
|
};
|
|
|
|
static int __init ip6table_filter_init(void)
|
|
{
|
|
int ret;
|
|
|
|
if (forward < 0 || forward > NF_MAX_VERDICT) {
|
|
pr_err("iptables forward must be 0 or 1\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = register_pernet_subsys(&ip6table_filter_net_ops);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* Register hooks */
|
|
filter_ops = xt_hook_link(&packet_filter, ip6table_filter_hook);
|
|
if (IS_ERR(filter_ops)) {
|
|
ret = PTR_ERR(filter_ops);
|
|
goto cleanup_table;
|
|
}
|
|
|
|
return ret;
|
|
|
|
cleanup_table:
|
|
unregister_pernet_subsys(&ip6table_filter_net_ops);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit ip6table_filter_fini(void)
|
|
{
|
|
xt_hook_unlink(&packet_filter, filter_ops);
|
|
unregister_pernet_subsys(&ip6table_filter_net_ops);
|
|
}
|
|
|
|
module_init(ip6table_filter_init);
|
|
module_exit(ip6table_filter_fini);
|