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Commit | Line | Data |
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1da177e4 | 1 | /* |
f72e25a8 | 2 | * xt_iprange - Netfilter module to match IP address ranges |
1da177e4 | 3 | * |
f72e25a8 | 4 | * (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> |
1a50c5a1 | 5 | * (C) CC Computer Consultants GmbH, 2008 |
1da177e4 | 6 | * |
f72e25a8 JE |
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. | |
1da177e4 LT |
10 | */ |
11 | #include <linux/module.h> | |
12 | #include <linux/skbuff.h> | |
13 | #include <linux/ip.h> | |
1a50c5a1 | 14 | #include <linux/ipv6.h> |
6709dbbb | 15 | #include <linux/netfilter/x_tables.h> |
5da621f1 | 16 | #include <linux/netfilter/xt_iprange.h> |
1da177e4 | 17 | |
1a50c5a1 | 18 | static bool |
f7108a20 | 19 | iprange_mt4(const struct sk_buff *skb, const struct xt_match_param *par) |
1a50c5a1 | 20 | { |
f7108a20 | 21 | const struct xt_iprange_mtinfo *info = par->matchinfo; |
1a50c5a1 JE |
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); | |
6def1eb4 | 28 | m ^= !!(info->flags & IPRANGE_SRC_INV); |
1a50c5a1 | 29 | if (m) { |
14d5e834 HH |
30 | pr_debug("src IP %pI4 NOT in range %s%pI4-%pI4\n", |
31 | &iph->saddr, | |
1a50c5a1 | 32 | (info->flags & IPRANGE_SRC_INV) ? "(INV) " : "", |
14d5e834 HH |
33 | &info->src_max.ip, |
34 | &info->src_max.ip); | |
1a50c5a1 JE |
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); | |
6def1eb4 | 41 | m ^= !!(info->flags & IPRANGE_DST_INV); |
1a50c5a1 | 42 | if (m) { |
14d5e834 HH |
43 | pr_debug("dst IP %pI4 NOT in range %s%pI4-%pI4\n", |
44 | &iph->daddr, | |
1a50c5a1 | 45 | (info->flags & IPRANGE_DST_INV) ? "(INV) " : "", |
14d5e834 HH |
46 | &info->dst_min.ip, |
47 | &info->dst_max.ip); | |
1a50c5a1 JE |
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) { | |
27ecb1ff | 61 | r = ntohl(a->s6_addr32[i]) - ntohl(b->s6_addr32[i]); |
1a50c5a1 JE |
62 | if (r != 0) |
63 | return r; | |
64 | } | |
65 | ||
66 | return 0; | |
67 | } | |
68 | ||
69 | static bool | |
f7108a20 | 70 | iprange_mt6(const struct sk_buff *skb, const struct xt_match_param *par) |
1a50c5a1 | 71 | { |
f7108a20 | 72 | const struct xt_iprange_mtinfo *info = par->matchinfo; |
1a50c5a1 JE |
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; | |
6def1eb4 | 79 | m ^= !!(info->flags & IPRANGE_SRC_INV); |
1a50c5a1 JE |
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; | |
6def1eb4 | 86 | m ^= !!(info->flags & IPRANGE_DST_INV); |
1a50c5a1 JE |
87 | if (m) |
88 | return false; | |
89 | } | |
90 | return true; | |
91 | } | |
92 | ||
93 | static struct xt_match iprange_mt_reg[] __read_mostly = { | |
1a50c5a1 JE |
94 | { |
95 | .name = "iprange", | |
96 | .revision = 1, | |
ee999d8b | 97 | .family = NFPROTO_IPV4, |
1a50c5a1 JE |
98 | .match = iprange_mt4, |
99 | .matchsize = sizeof(struct xt_iprange_mtinfo), | |
100 | .me = THIS_MODULE, | |
101 | }, | |
102 | { | |
103 | .name = "iprange", | |
104 | .revision = 1, | |
ee999d8b | 105 | .family = NFPROTO_IPV6, |
1a50c5a1 JE |
106 | .match = iprange_mt6, |
107 | .matchsize = sizeof(struct xt_iprange_mtinfo), | |
108 | .me = THIS_MODULE, | |
109 | }, | |
1da177e4 LT |
110 | }; |
111 | ||
d3c5ee6d | 112 | static int __init iprange_mt_init(void) |
1da177e4 | 113 | { |
1a50c5a1 | 114 | return xt_register_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg)); |
1da177e4 LT |
115 | } |
116 | ||
d3c5ee6d | 117 | static void __exit iprange_mt_exit(void) |
1da177e4 | 118 | { |
1a50c5a1 | 119 | xt_unregister_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg)); |
1da177e4 LT |
120 | } |
121 | ||
d3c5ee6d JE |
122 | module_init(iprange_mt_init); |
123 | module_exit(iprange_mt_exit); | |
f72e25a8 | 124 | MODULE_LICENSE("GPL"); |
36d4084d JE |
125 | MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); |
126 | MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>"); | |
f72e25a8 | 127 | MODULE_DESCRIPTION("Xtables: arbitrary IPv4 range matching"); |
01b7a314 PO |
128 | MODULE_ALIAS("ipt_iprange"); |
129 | MODULE_ALIAS("ip6t_iprange"); |