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 LT |
17 | #include <linux/netfilter_ipv4/ipt_iprange.h> |
18 | ||
1d93a9cb | 19 | static bool |
f7108a20 | 20 | iprange_mt_v0(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 21 | { |
f7108a20 | 22 | const struct ipt_iprange_info *info = par->matchinfo; |
eddc9ec5 | 23 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
24 | |
25 | if (info->flags & IPRANGE_SRC) { | |
7c4e36bc JE |
26 | if ((ntohl(iph->saddr) < ntohl(info->src.min_ip) |
27 | || ntohl(iph->saddr) > ntohl(info->src.max_ip)) | |
1da177e4 | 28 | ^ !!(info->flags & IPRANGE_SRC_INV)) { |
14d5e834 HH |
29 | pr_debug("src IP %pI4 NOT in range %s%pI4-%pI4\n", |
30 | &iph->saddr, | |
0d53778e | 31 | info->flags & IPRANGE_SRC_INV ? "(INV) " : "", |
14d5e834 HH |
32 | &info->src.min_ip, |
33 | &info->src.max_ip); | |
1d93a9cb | 34 | return false; |
1da177e4 LT |
35 | } |
36 | } | |
37 | if (info->flags & IPRANGE_DST) { | |
7c4e36bc JE |
38 | if ((ntohl(iph->daddr) < ntohl(info->dst.min_ip) |
39 | || ntohl(iph->daddr) > ntohl(info->dst.max_ip)) | |
1da177e4 | 40 | ^ !!(info->flags & IPRANGE_DST_INV)) { |
14d5e834 HH |
41 | pr_debug("dst IP %pI4 NOT in range %s%pI4-%pI4\n", |
42 | &iph->daddr, | |
0d53778e | 43 | info->flags & IPRANGE_DST_INV ? "(INV) " : "", |
14d5e834 HH |
44 | &info->dst.min_ip, |
45 | &info->dst.max_ip); | |
1d93a9cb | 46 | return false; |
1da177e4 LT |
47 | } |
48 | } | |
1d93a9cb | 49 | return true; |
1da177e4 LT |
50 | } |
51 | ||
1a50c5a1 | 52 | static bool |
f7108a20 | 53 | iprange_mt4(const struct sk_buff *skb, const struct xt_match_param *par) |
1a50c5a1 | 54 | { |
f7108a20 | 55 | const struct xt_iprange_mtinfo *info = par->matchinfo; |
1a50c5a1 JE |
56 | const struct iphdr *iph = ip_hdr(skb); |
57 | bool m; | |
58 | ||
59 | if (info->flags & IPRANGE_SRC) { | |
60 | m = ntohl(iph->saddr) < ntohl(info->src_min.ip); | |
61 | m |= ntohl(iph->saddr) > ntohl(info->src_max.ip); | |
6def1eb4 | 62 | m ^= !!(info->flags & IPRANGE_SRC_INV); |
1a50c5a1 | 63 | if (m) { |
14d5e834 HH |
64 | pr_debug("src IP %pI4 NOT in range %s%pI4-%pI4\n", |
65 | &iph->saddr, | |
1a50c5a1 | 66 | (info->flags & IPRANGE_SRC_INV) ? "(INV) " : "", |
14d5e834 HH |
67 | &info->src_max.ip, |
68 | &info->src_max.ip); | |
1a50c5a1 JE |
69 | return false; |
70 | } | |
71 | } | |
72 | if (info->flags & IPRANGE_DST) { | |
73 | m = ntohl(iph->daddr) < ntohl(info->dst_min.ip); | |
74 | m |= ntohl(iph->daddr) > ntohl(info->dst_max.ip); | |
6def1eb4 | 75 | m ^= !!(info->flags & IPRANGE_DST_INV); |
1a50c5a1 | 76 | if (m) { |
14d5e834 HH |
77 | pr_debug("dst IP %pI4 NOT in range %s%pI4-%pI4\n", |
78 | &iph->daddr, | |
1a50c5a1 | 79 | (info->flags & IPRANGE_DST_INV) ? "(INV) " : "", |
14d5e834 HH |
80 | &info->dst_min.ip, |
81 | &info->dst_max.ip); | |
1a50c5a1 JE |
82 | return false; |
83 | } | |
84 | } | |
85 | return true; | |
86 | } | |
87 | ||
88 | static inline int | |
89 | iprange_ipv6_sub(const struct in6_addr *a, const struct in6_addr *b) | |
90 | { | |
91 | unsigned int i; | |
92 | int r; | |
93 | ||
94 | for (i = 0; i < 4; ++i) { | |
27ecb1ff | 95 | r = ntohl(a->s6_addr32[i]) - ntohl(b->s6_addr32[i]); |
1a50c5a1 JE |
96 | if (r != 0) |
97 | return r; | |
98 | } | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | static bool | |
f7108a20 | 104 | iprange_mt6(const struct sk_buff *skb, const struct xt_match_param *par) |
1a50c5a1 | 105 | { |
f7108a20 | 106 | const struct xt_iprange_mtinfo *info = par->matchinfo; |
1a50c5a1 JE |
107 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
108 | bool m; | |
109 | ||
110 | if (info->flags & IPRANGE_SRC) { | |
111 | m = iprange_ipv6_sub(&iph->saddr, &info->src_min.in6) < 0; | |
112 | m |= iprange_ipv6_sub(&iph->saddr, &info->src_max.in6) > 0; | |
6def1eb4 | 113 | m ^= !!(info->flags & IPRANGE_SRC_INV); |
1a50c5a1 JE |
114 | if (m) |
115 | return false; | |
116 | } | |
117 | if (info->flags & IPRANGE_DST) { | |
118 | m = iprange_ipv6_sub(&iph->daddr, &info->dst_min.in6) < 0; | |
119 | m |= iprange_ipv6_sub(&iph->daddr, &info->dst_max.in6) > 0; | |
6def1eb4 | 120 | m ^= !!(info->flags & IPRANGE_DST_INV); |
1a50c5a1 JE |
121 | if (m) |
122 | return false; | |
123 | } | |
124 | return true; | |
125 | } | |
126 | ||
127 | static struct xt_match iprange_mt_reg[] __read_mostly = { | |
128 | { | |
129 | .name = "iprange", | |
130 | .revision = 0, | |
ee999d8b | 131 | .family = NFPROTO_IPV4, |
1a50c5a1 JE |
132 | .match = iprange_mt_v0, |
133 | .matchsize = sizeof(struct ipt_iprange_info), | |
134 | .me = THIS_MODULE, | |
135 | }, | |
136 | { | |
137 | .name = "iprange", | |
138 | .revision = 1, | |
ee999d8b | 139 | .family = NFPROTO_IPV4, |
1a50c5a1 JE |
140 | .match = iprange_mt4, |
141 | .matchsize = sizeof(struct xt_iprange_mtinfo), | |
142 | .me = THIS_MODULE, | |
143 | }, | |
144 | { | |
145 | .name = "iprange", | |
146 | .revision = 1, | |
ee999d8b | 147 | .family = NFPROTO_IPV6, |
1a50c5a1 JE |
148 | .match = iprange_mt6, |
149 | .matchsize = sizeof(struct xt_iprange_mtinfo), | |
150 | .me = THIS_MODULE, | |
151 | }, | |
1da177e4 LT |
152 | }; |
153 | ||
d3c5ee6d | 154 | static int __init iprange_mt_init(void) |
1da177e4 | 155 | { |
1a50c5a1 | 156 | return xt_register_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg)); |
1da177e4 LT |
157 | } |
158 | ||
d3c5ee6d | 159 | static void __exit iprange_mt_exit(void) |
1da177e4 | 160 | { |
1a50c5a1 | 161 | xt_unregister_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg)); |
1da177e4 LT |
162 | } |
163 | ||
d3c5ee6d JE |
164 | module_init(iprange_mt_init); |
165 | module_exit(iprange_mt_exit); | |
f72e25a8 | 166 | MODULE_LICENSE("GPL"); |
1a50c5a1 | 167 | MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>, Jan Engelhardt <jengelh@computergmbh.de>"); |
f72e25a8 | 168 | MODULE_DESCRIPTION("Xtables: arbitrary IPv4 range matching"); |
01b7a314 PO |
169 | MODULE_ALIAS("ipt_iprange"); |
170 | MODULE_ALIAS("ip6t_iprange"); |