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1 | /* |
2 | * xt_iprange - Netfilter module to match IP address ranges |
3 | * |
4 | * (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> |
5 | * (C) CC Computer Consultants GmbH, 2008 |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License version 2 as |
9 | * published by the Free Software Foundation. |
10 | */ |
11 | #include <linux/module.h> |
12 | #include <linux/skbuff.h> |
13 | #include <linux/ip.h> |
14 | #include <linux/ipv6.h> |
15 | #include <linux/netfilter/x_tables.h> |
16 | #include <linux/netfilter/xt_iprange.h> |
17 | |
18 | static bool |
19 | iprange_mt4(const struct sk_buff *skb, const struct xt_match_param *par) |
20 | { |
21 | const struct xt_iprange_mtinfo *info = par->matchinfo; |
22 | const struct iphdr *iph = ip_hdr(skb); |
23 | bool m; |
24 | |
25 | if (info->flags & IPRANGE_SRC) { |
26 | m = ntohl(iph->saddr) < ntohl(info->src_min.ip); |
27 | m |= ntohl(iph->saddr) > ntohl(info->src_max.ip); |
28 | m ^= !!(info->flags & IPRANGE_SRC_INV); |
29 | if (m) { |
30 | pr_debug("src IP %pI4 NOT in range %s%pI4-%pI4\n", |
31 | &iph->saddr, |
32 | (info->flags & IPRANGE_SRC_INV) ? "(INV) " : "", |
33 | &info->src_max.ip, |
34 | &info->src_max.ip); |
35 | return false; |
36 | } |
37 | } |
38 | if (info->flags & IPRANGE_DST) { |
39 | m = ntohl(iph->daddr) < ntohl(info->dst_min.ip); |
40 | m |= ntohl(iph->daddr) > ntohl(info->dst_max.ip); |
41 | m ^= !!(info->flags & IPRANGE_DST_INV); |
42 | if (m) { |
43 | pr_debug("dst IP %pI4 NOT in range %s%pI4-%pI4\n", |
44 | &iph->daddr, |
45 | (info->flags & IPRANGE_DST_INV) ? "(INV) " : "", |
46 | &info->dst_min.ip, |
47 | &info->dst_max.ip); |
48 | return false; |
49 | } |
50 | } |
51 | return true; |
52 | } |
53 | |
54 | static inline int |
55 | iprange_ipv6_sub(const struct in6_addr *a, const struct in6_addr *b) |
56 | { |
57 | unsigned int i; |
58 | int r; |
59 | |
60 | for (i = 0; i < 4; ++i) { |
61 | r = ntohl(a->s6_addr32[i]) - ntohl(b->s6_addr32[i]); |
62 | if (r != 0) |
63 | return r; |
64 | } |
65 | |
66 | return 0; |
67 | } |
68 | |
69 | static bool |
70 | iprange_mt6(const struct sk_buff *skb, const struct xt_match_param *par) |
71 | { |
72 | const struct xt_iprange_mtinfo *info = par->matchinfo; |
73 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
74 | bool m; |
75 | |
76 | if (info->flags & IPRANGE_SRC) { |
77 | m = iprange_ipv6_sub(&iph->saddr, &info->src_min.in6) < 0; |
78 | m |= iprange_ipv6_sub(&iph->saddr, &info->src_max.in6) > 0; |
79 | m ^= !!(info->flags & IPRANGE_SRC_INV); |
80 | if (m) |
81 | return false; |
82 | } |
83 | if (info->flags & IPRANGE_DST) { |
84 | m = iprange_ipv6_sub(&iph->daddr, &info->dst_min.in6) < 0; |
85 | m |= iprange_ipv6_sub(&iph->daddr, &info->dst_max.in6) > 0; |
86 | m ^= !!(info->flags & IPRANGE_DST_INV); |
87 | if (m) |
88 | return false; |
89 | } |
90 | return true; |
91 | } |
92 | |
93 | static struct xt_match iprange_mt_reg[] __read_mostly = { |
94 | { |
95 | .name = "iprange", |
96 | .revision = 1, |
97 | .family = NFPROTO_IPV4, |
98 | .match = iprange_mt4, |
99 | .matchsize = sizeof(struct xt_iprange_mtinfo), |
100 | .me = THIS_MODULE, |
101 | }, |
102 | { |
103 | .name = "iprange", |
104 | .revision = 1, |
105 | .family = NFPROTO_IPV6, |
106 | .match = iprange_mt6, |
107 | .matchsize = sizeof(struct xt_iprange_mtinfo), |
108 | .me = THIS_MODULE, |
109 | }, |
110 | }; |
111 | |
112 | static int __init iprange_mt_init(void) |
113 | { |
114 | return xt_register_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg)); |
115 | } |
116 | |
117 | static void __exit iprange_mt_exit(void) |
118 | { |
119 | xt_unregister_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg)); |
120 | } |
121 | |
122 | module_init(iprange_mt_init); |
123 | module_exit(iprange_mt_exit); |
124 | MODULE_LICENSE("GPL"); |
125 | MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); |
126 | MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>"); |
127 | MODULE_DESCRIPTION("Xtables: arbitrary IPv4 range matching"); |
128 | MODULE_ALIAS("ipt_iprange"); |
129 | MODULE_ALIAS("ip6t_iprange"); |
130 |
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