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
|
// SPDX-License-Identifier: GPL-2.0-only
/* Masquerade. Simple mapping which alters range to a local IP address
(depending on route). */
/* (C) 1999-2001 Paul `Rusty' Russell
* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/netfilter/x_tables.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_masquerade.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
MODULE_DESCRIPTION("Xtables: automatic-address SNAT");
/* FIXME: Multiple targets. --RR */
static int masquerade_tg_check(const struct xt_tgchk_param *par)
{
const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
if (mr->range[0].flags & NF_NAT_RANGE_MAP_IPS) {
pr_debug("bad MAP_IPS.\n");
return -EINVAL;
}
if (mr->rangesize != 1) {
pr_debug("bad rangesize %u\n", mr->rangesize);
return -EINVAL;
}
return nf_ct_netns_get(par->net, par->family);
}
static unsigned int
masquerade_tg(struct sk_buff *skb, const struct xt_action_param *par)
{
struct nf_nat_range2 range;
const struct nf_nat_ipv4_multi_range_compat *mr;
mr = par->targinfo;
range.flags = mr->range[0].flags;
range.min_proto = mr->range[0].min;
range.max_proto = mr->range[0].max;
return nf_nat_masquerade_ipv4(skb, xt_hooknum(par), &range,
xt_out(par));
}
static void masquerade_tg_destroy(const struct xt_tgdtor_param *par)
{
nf_ct_netns_put(par->net, par->family);
}
#if IS_ENABLED(CONFIG_IPV6)
static unsigned int
masquerade_tg6(struct sk_buff *skb, const struct xt_action_param *par)
{
return nf_nat_masquerade_ipv6(skb, par->targinfo, xt_out(par));
}
static int masquerade_tg6_checkentry(const struct xt_tgchk_param *par)
{
const struct nf_nat_range2 *range = par->targinfo;
if (range->flags & NF_NAT_RANGE_MAP_IPS)
return -EINVAL;
return nf_ct_netns_get(par->net, par->family);
}
#endif
static struct xt_target masquerade_tg_reg[] __read_mostly = {
{
#if IS_ENABLED(CONFIG_IPV6)
.name = "MASQUERADE",
.family = NFPROTO_IPV6,
.target = masquerade_tg6,
.targetsize = sizeof(struct nf_nat_range),
.table = "nat",
.hooks = 1 << NF_INET_POST_ROUTING,
.checkentry = masquerade_tg6_checkentry,
.destroy = masquerade_tg_destroy,
.me = THIS_MODULE,
}, {
#endif
.name = "MASQUERADE",
.family = NFPROTO_IPV4,
.target = masquerade_tg,
.targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat),
.table = "nat",
.hooks = 1 << NF_INET_POST_ROUTING,
.checkentry = masquerade_tg_check,
.destroy = masquerade_tg_destroy,
.me = THIS_MODULE,
}
};
static int __init masquerade_tg_init(void)
{
int ret;
ret = xt_register_targets(masquerade_tg_reg,
ARRAY_SIZE(masquerade_tg_reg));
if (ret)
return ret;
ret = nf_nat_masquerade_inet_register_notifiers();
if (ret) {
xt_unregister_targets(masquerade_tg_reg,
ARRAY_SIZE(masquerade_tg_reg));
return ret;
}
return ret;
}
static void __exit masquerade_tg_exit(void)
{
xt_unregister_targets(masquerade_tg_reg, ARRAY_SIZE(masquerade_tg_reg));
nf_nat_masquerade_inet_unregister_notifiers();
}
module_init(masquerade_tg_init);
module_exit(masquerade_tg_exit);
#if IS_ENABLED(CONFIG_IPV6)
MODULE_ALIAS("ip6t_MASQUERADE");
#endif
MODULE_ALIAS("ipt_MASQUERADE");
|
