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
|
/*
* xt_iprange - Netfilter module to match IP address ranges
*
* (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
* (C) CC Computer Consultants GmbH, 2008
*
* 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/skbuff.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_iprange.h>
static bool
iprange_mt4(const struct sk_buff *skb, const struct xt_match_param *par)
{
const struct xt_iprange_mtinfo *info = par->matchinfo;
const struct iphdr *iph = ip_hdr(skb);
bool m;
if (info->flags & IPRANGE_SRC) {
m = ntohl(iph->saddr) < ntohl(info->src_min.ip);
m |= ntohl(iph->saddr) > ntohl(info->src_max.ip);
m ^= !!(info->flags & IPRANGE_SRC_INV);
if (m) {
pr_debug("src IP %pI4 NOT in range %s%pI4-%pI4\n",
&iph->saddr,
(info->flags & IPRANGE_SRC_INV) ? "(INV) " : "",
&info->src_max.ip,
&info->src_max.ip);
return false;
}
}
if (info->flags & IPRANGE_DST) {
m = ntohl(iph->daddr) < ntohl(info->dst_min.ip);
m |= ntohl(iph->daddr) > ntohl(info->dst_max.ip);
m ^= !!(info->flags & IPRANGE_DST_INV);
if (m) {
pr_debug("dst IP %pI4 NOT in range %s%pI4-%pI4\n",
&iph->daddr,
(info->flags & IPRANGE_DST_INV) ? "(INV) " : "",
&info->dst_min.ip,
&info->dst_max.ip);
return false;
}
}
return true;
}
static inline int
iprange_ipv6_sub(const struct in6_addr *a, const struct in6_addr *b)
{
unsigned int i;
int r;
for (i = 0; i < 4; ++i) {
r = ntohl(a->s6_addr32[i]) - ntohl(b->s6_addr32[i]);
if (r != 0)
return r;
}
return 0;
}
static bool
iprange_mt6(const struct sk_buff *skb, const struct xt_match_param *par)
{
const struct xt_iprange_mtinfo *info = par->matchinfo;
const struct ipv6hdr *iph = ipv6_hdr(skb);
bool m;
if (info->flags & IPRANGE_SRC) {
m = iprange_ipv6_sub(&iph->saddr, &info->src_min.in6) < 0;
m |= iprange_ipv6_sub(&iph->saddr, &info->src_max.in6) > 0;
m ^= !!(info->flags & IPRANGE_SRC_INV);
if (m)
return false;
}
if (info->flags & IPRANGE_DST) {
m = iprange_ipv6_sub(&iph->daddr, &info->dst_min.in6) < 0;
m |= iprange_ipv6_sub(&iph->daddr, &info->dst_max.in6) > 0;
m ^= !!(info->flags & IPRANGE_DST_INV);
if (m)
return false;
}
return true;
}
static struct xt_match iprange_mt_reg[] __read_mostly = {
{
.name = "iprange",
.revision = 1,
.family = NFPROTO_IPV4,
.match = iprange_mt4,
.matchsize = sizeof(struct xt_iprange_mtinfo),
.me = THIS_MODULE,
},
{
.name = "iprange",
.revision = 1,
.family = NFPROTO_IPV6,
.match = iprange_mt6,
.matchsize = sizeof(struct xt_iprange_mtinfo),
.me = THIS_MODULE,
},
};
static int __init iprange_mt_init(void)
{
return xt_register_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg));
}
static void __exit iprange_mt_exit(void)
{
xt_unregister_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg));
}
module_init(iprange_mt_init);
module_exit(iprange_mt_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>");
MODULE_DESCRIPTION("Xtables: arbitrary IPv4 range matching");
MODULE_ALIAS("ipt_iprange");
MODULE_ALIAS("ip6t_iprange");
|
