d2c5c103b1
The l3proto name is gone, its header file is the last trace. While at it, also remove nf_nat_core.h, its very small and all users include nf_nat.h too. before: text data bss dec hex filename 22948 1612 4136 28696 7018 nf_nat.ko after removal of l3proto register/unregister functions: text data bss dec hex filename 22196 1516 4136 27848 6cc8 nf_nat.ko checkpatch complains about overly long lines, but line breaks do not make things more readable and the line length gets smaller here, not larger. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
154 lines
3.4 KiB
C
154 lines
3.4 KiB
C
/* (C) 1999-2001 Paul `Rusty' Russell
|
|
* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
|
|
* (C) 2011 Patrick McHardy <kaber@trash.net>
|
|
*
|
|
* 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/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>
|
|
|
|
static int __net_init iptable_nat_table_init(struct net *net);
|
|
|
|
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,
|
|
.table_init = iptable_nat_table_init,
|
|
};
|
|
|
|
static unsigned int iptable_nat_do_chain(void *priv,
|
|
struct sk_buff *skb,
|
|
const struct nf_hook_state *state)
|
|
{
|
|
return ipt_do_table(skb, state, state->net->ipv4.nat_table);
|
|
}
|
|
|
|
static const struct nf_hook_ops nf_nat_ipv4_ops[] = {
|
|
{
|
|
.hook = iptable_nat_do_chain,
|
|
.pf = NFPROTO_IPV4,
|
|
.hooknum = NF_INET_PRE_ROUTING,
|
|
.priority = NF_IP_PRI_NAT_DST,
|
|
},
|
|
{
|
|
.hook = iptable_nat_do_chain,
|
|
.pf = NFPROTO_IPV4,
|
|
.hooknum = NF_INET_POST_ROUTING,
|
|
.priority = NF_IP_PRI_NAT_SRC,
|
|
},
|
|
{
|
|
.hook = iptable_nat_do_chain,
|
|
.pf = NFPROTO_IPV4,
|
|
.hooknum = NF_INET_LOCAL_OUT,
|
|
.priority = NF_IP_PRI_NAT_DST,
|
|
},
|
|
{
|
|
.hook = iptable_nat_do_chain,
|
|
.pf = NFPROTO_IPV4,
|
|
.hooknum = NF_INET_LOCAL_IN,
|
|
.priority = NF_IP_PRI_NAT_SRC,
|
|
},
|
|
};
|
|
|
|
static int ipt_nat_register_lookups(struct net *net)
|
|
{
|
|
int i, ret;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(nf_nat_ipv4_ops); i++) {
|
|
ret = nf_nat_ipv4_register_fn(net, &nf_nat_ipv4_ops[i]);
|
|
if (ret) {
|
|
while (i)
|
|
nf_nat_ipv4_unregister_fn(net, &nf_nat_ipv4_ops[--i]);
|
|
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ipt_nat_unregister_lookups(struct net *net)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(nf_nat_ipv4_ops); i++)
|
|
nf_nat_ipv4_unregister_fn(net, &nf_nat_ipv4_ops[i]);
|
|
}
|
|
|
|
static int __net_init iptable_nat_table_init(struct net *net)
|
|
{
|
|
struct ipt_replace *repl;
|
|
int ret;
|
|
|
|
if (net->ipv4.nat_table)
|
|
return 0;
|
|
|
|
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, &net->ipv4.nat_table);
|
|
if (ret < 0) {
|
|
kfree(repl);
|
|
return ret;
|
|
}
|
|
|
|
ret = ipt_nat_register_lookups(net);
|
|
if (ret < 0) {
|
|
ipt_unregister_table(net, net->ipv4.nat_table, NULL);
|
|
net->ipv4.nat_table = NULL;
|
|
}
|
|
|
|
kfree(repl);
|
|
return ret;
|
|
}
|
|
|
|
static void __net_exit iptable_nat_net_exit(struct net *net)
|
|
{
|
|
if (!net->ipv4.nat_table)
|
|
return;
|
|
ipt_nat_unregister_lookups(net);
|
|
ipt_unregister_table(net, net->ipv4.nat_table, NULL);
|
|
net->ipv4.nat_table = NULL;
|
|
}
|
|
|
|
static struct pernet_operations iptable_nat_net_ops = {
|
|
.exit = iptable_nat_net_exit,
|
|
};
|
|
|
|
static int __init iptable_nat_init(void)
|
|
{
|
|
int ret = register_pernet_subsys(&iptable_nat_net_ops);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = iptable_nat_table_init(&init_net);
|
|
if (ret)
|
|
unregister_pernet_subsys(&iptable_nat_net_ops);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit iptable_nat_exit(void)
|
|
{
|
|
unregister_pernet_subsys(&iptable_nat_net_ops);
|
|
}
|
|
|
|
module_init(iptable_nat_init);
|
|
module_exit(iptable_nat_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|