mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Florian Westphal](/assets/img/avatar_default.png)
This is possible now that the xt_table structure is passed in via *priv. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
172 lines
3.6 KiB
C
172 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/* (C) 1999-2001 Paul `Rusty' Russell
|
|
* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
|
|
* (C) 2011 Patrick McHardy <kaber@trash.net>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/netfilter.h>
|
|
#include <linux/netfilter_ipv4.h>
|
|
#include <linux/netfilter_ipv4/ip_tables.h>
|
|
#include <linux/ip.h>
|
|
#include <net/ip.h>
|
|
|
|
#include <net/netfilter/nf_nat.h>
|
|
|
|
struct iptable_nat_pernet {
|
|
struct nf_hook_ops *nf_nat_ops;
|
|
};
|
|
|
|
static unsigned int iptable_nat_net_id __read_mostly;
|
|
|
|
static const struct xt_table nf_nat_ipv4_table = {
|
|
.name = "nat",
|
|
.valid_hooks = (1 << NF_INET_PRE_ROUTING) |
|
|
(1 << NF_INET_POST_ROUTING) |
|
|
(1 << NF_INET_LOCAL_OUT) |
|
|
(1 << NF_INET_LOCAL_IN),
|
|
.me = THIS_MODULE,
|
|
.af = NFPROTO_IPV4,
|
|
};
|
|
|
|
static const struct nf_hook_ops nf_nat_ipv4_ops[] = {
|
|
{
|
|
.hook = ipt_do_table,
|
|
.pf = NFPROTO_IPV4,
|
|
.hooknum = NF_INET_PRE_ROUTING,
|
|
.priority = NF_IP_PRI_NAT_DST,
|
|
},
|
|
{
|
|
.hook = ipt_do_table,
|
|
.pf = NFPROTO_IPV4,
|
|
.hooknum = NF_INET_POST_ROUTING,
|
|
.priority = NF_IP_PRI_NAT_SRC,
|
|
},
|
|
{
|
|
.hook = ipt_do_table,
|
|
.pf = NFPROTO_IPV4,
|
|
.hooknum = NF_INET_LOCAL_OUT,
|
|
.priority = NF_IP_PRI_NAT_DST,
|
|
},
|
|
{
|
|
.hook = ipt_do_table,
|
|
.pf = NFPROTO_IPV4,
|
|
.hooknum = NF_INET_LOCAL_IN,
|
|
.priority = NF_IP_PRI_NAT_SRC,
|
|
},
|
|
};
|
|
|
|
static int ipt_nat_register_lookups(struct net *net)
|
|
{
|
|
struct iptable_nat_pernet *xt_nat_net;
|
|
struct nf_hook_ops *ops;
|
|
struct xt_table *table;
|
|
int i, ret;
|
|
|
|
xt_nat_net = net_generic(net, iptable_nat_net_id);
|
|
table = xt_find_table(net, NFPROTO_IPV4, "nat");
|
|
if (WARN_ON_ONCE(!table))
|
|
return -ENOENT;
|
|
|
|
ops = kmemdup(nf_nat_ipv4_ops, sizeof(nf_nat_ipv4_ops), GFP_KERNEL);
|
|
if (!ops)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(nf_nat_ipv4_ops); i++) {
|
|
ops[i].priv = table;
|
|
ret = nf_nat_ipv4_register_fn(net, &ops[i]);
|
|
if (ret) {
|
|
while (i)
|
|
nf_nat_ipv4_unregister_fn(net, &ops[--i]);
|
|
|
|
kfree(ops);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
xt_nat_net->nf_nat_ops = ops;
|
|
return 0;
|
|
}
|
|
|
|
static void ipt_nat_unregister_lookups(struct net *net)
|
|
{
|
|
struct iptable_nat_pernet *xt_nat_net = net_generic(net, iptable_nat_net_id);
|
|
struct nf_hook_ops *ops = xt_nat_net->nf_nat_ops;
|
|
int i;
|
|
|
|
if (!ops)
|
|
return;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(nf_nat_ipv4_ops); i++)
|
|
nf_nat_ipv4_unregister_fn(net, &ops[i]);
|
|
|
|
kfree(ops);
|
|
}
|
|
|
|
static int iptable_nat_table_init(struct net *net)
|
|
{
|
|
struct ipt_replace *repl;
|
|
int ret;
|
|
|
|
repl = ipt_alloc_initial_table(&nf_nat_ipv4_table);
|
|
if (repl == NULL)
|
|
return -ENOMEM;
|
|
|
|
ret = ipt_register_table(net, &nf_nat_ipv4_table, repl, NULL);
|
|
if (ret < 0) {
|
|
kfree(repl);
|
|
return ret;
|
|
}
|
|
|
|
ret = ipt_nat_register_lookups(net);
|
|
if (ret < 0)
|
|
ipt_unregister_table_exit(net, "nat");
|
|
|
|
kfree(repl);
|
|
return ret;
|
|
}
|
|
|
|
static void __net_exit iptable_nat_net_pre_exit(struct net *net)
|
|
{
|
|
ipt_nat_unregister_lookups(net);
|
|
}
|
|
|
|
static void __net_exit iptable_nat_net_exit(struct net *net)
|
|
{
|
|
ipt_unregister_table_exit(net, "nat");
|
|
}
|
|
|
|
static struct pernet_operations iptable_nat_net_ops = {
|
|
.pre_exit = iptable_nat_net_pre_exit,
|
|
.exit = iptable_nat_net_exit,
|
|
.id = &iptable_nat_net_id,
|
|
.size = sizeof(struct iptable_nat_pernet),
|
|
};
|
|
|
|
static int __init iptable_nat_init(void)
|
|
{
|
|
int ret = xt_register_template(&nf_nat_ipv4_table,
|
|
iptable_nat_table_init);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = register_pernet_subsys(&iptable_nat_net_ops);
|
|
if (ret < 0) {
|
|
xt_unregister_template(&nf_nat_ipv4_table);
|
|
return ret;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit iptable_nat_exit(void)
|
|
{
|
|
unregister_pernet_subsys(&iptable_nat_net_ops);
|
|
xt_unregister_template(&nf_nat_ipv4_table);
|
|
}
|
|
|
|
module_init(iptable_nat_init);
|
|
module_exit(iptable_nat_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|