1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
*
* Based on Rusty Russell's IPv4 NAT code. Development of IPv6 NAT
* funded by Astaro.
*/
#include <linux/module.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv6.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <linux/ipv6.h>
#include <net/ipv6.h>
#include <net/netfilter/nf_nat.h>
struct ip6table_nat_pernet {
struct nf_hook_ops *nf_nat_ops;
};
static unsigned int ip6table_nat_net_id __read_mostly;
static const struct xt_table nf_nat_ipv6_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_IPV6,
};
static const struct nf_hook_ops nf_nat_ipv6_ops[] = {
{
.hook = ip6t_do_table,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_PRE_ROUTING,
.priority = NF_IP6_PRI_NAT_DST,
},
{
.hook = ip6t_do_table,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_POST_ROUTING,
.priority = NF_IP6_PRI_NAT_SRC,
},
{
.hook = ip6t_do_table,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP6_PRI_NAT_DST,
},
{
.hook = ip6t_do_table,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_LOCAL_IN,
.priority = NF_IP6_PRI_NAT_SRC,
},
};
static int ip6t_nat_register_lookups(struct net *net)
{
struct ip6table_nat_pernet *xt_nat_net;
struct nf_hook_ops *ops;
struct xt_table *table;
int i, ret;
table = xt_find_table(net, NFPROTO_IPV6, "nat");
if (WARN_ON_ONCE(!table))
return -ENOENT;
xt_nat_net = net_generic(net, ip6table_nat_net_id);
ops = kmemdup(nf_nat_ipv6_ops, sizeof(nf_nat_ipv6_ops), GFP_KERNEL);
if (!ops)
return -ENOMEM;
for (i = 0; i < ARRAY_SIZE(nf_nat_ipv6_ops); i++) {
ops[i].priv = table;
ret = nf_nat_ipv6_register_fn(net, &ops[i]);
if (ret) {
while (i)
nf_nat_ipv6_unregister_fn(net, &ops[--i]);
kfree(ops);
return ret;
}
}
xt_nat_net->nf_nat_ops = ops;
return 0;
}
static void ip6t_nat_unregister_lookups(struct net *net)
{
struct ip6table_nat_pernet *xt_nat_net = net_generic(net, ip6table_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_ipv6_ops); i++)
nf_nat_ipv6_unregister_fn(net, &ops[i]);
kfree(ops);
}
static int ip6table_nat_table_init(struct net *net)
{
struct ip6t_replace *repl;
int ret;
repl = ip6t_alloc_initial_table(&nf_nat_ipv6_table);
if (repl == NULL)
return -ENOMEM;
ret = ip6t_register_table(net, &nf_nat_ipv6_table, repl,
NULL);
if (ret < 0) {
kfree(repl);
return ret;
}
ret = ip6t_nat_register_lookups(net);
if (ret < 0)
ip6t_unregister_table_exit(net, "nat");
kfree(repl);
return ret;
}
static void __net_exit ip6table_nat_net_pre_exit(struct net *net)
{
ip6t_nat_unregister_lookups(net);
}
static void __net_exit ip6table_nat_net_exit(struct net *net)
{
ip6t_unregister_table_exit(net, "nat");
}
static struct pernet_operations ip6table_nat_net_ops = {
.pre_exit = ip6table_nat_net_pre_exit,
.exit = ip6table_nat_net_exit,
.id = &ip6table_nat_net_id,
.size = sizeof(struct ip6table_nat_pernet),
};
static int __init ip6table_nat_init(void)
{
int ret = xt_register_template(&nf_nat_ipv6_table,
ip6table_nat_table_init);
if (ret < 0)
return ret;
ret = register_pernet_subsys(&ip6table_nat_net_ops);
if (ret)
xt_unregister_template(&nf_nat_ipv6_table);
return ret;
}
static void __exit ip6table_nat_exit(void)
{
unregister_pernet_subsys(&ip6table_nat_net_ops);
xt_unregister_template(&nf_nat_ipv6_table);
}
module_init(ip6table_nat_init);
module_exit(ip6table_nat_exit);
MODULE_LICENSE("GPL");
|
