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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 | 10 | */ |
ff67e4e4 | 11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
1da177e4 LT |
12 | #include <linux/module.h> |
13 | #include <linux/skbuff.h> | |
14 | #include <linux/ip.h> | |
1a50c5a1 | 15 | #include <linux/ipv6.h> |
6709dbbb | 16 | #include <linux/netfilter/x_tables.h> |
5da621f1 | 17 | #include <linux/netfilter/xt_iprange.h> |
1da177e4 | 18 | |
1a50c5a1 | 19 | static bool |
62fc8051 | 20 | iprange_mt4(const struct sk_buff *skb, struct xt_action_param *par) |
1a50c5a1 | 21 | { |
f7108a20 | 22 | const struct xt_iprange_mtinfo *info = par->matchinfo; |
1a50c5a1 JE |
23 | const struct iphdr *iph = ip_hdr(skb); |
24 | bool m; | |
25 | ||
26 | if (info->flags & IPRANGE_SRC) { | |
27 | m = ntohl(iph->saddr) < ntohl(info->src_min.ip); | |
28 | m |= ntohl(iph->saddr) > ntohl(info->src_max.ip); | |
6def1eb4 | 29 | m ^= !!(info->flags & IPRANGE_SRC_INV); |
1a50c5a1 | 30 | if (m) { |
14d5e834 HH |
31 | pr_debug("src IP %pI4 NOT in range %s%pI4-%pI4\n", |
32 | &iph->saddr, | |
1a50c5a1 | 33 | (info->flags & IPRANGE_SRC_INV) ? "(INV) " : "", |
14d5e834 HH |
34 | &info->src_max.ip, |
35 | &info->src_max.ip); | |
1a50c5a1 JE |
36 | return false; |
37 | } | |
38 | } | |
39 | if (info->flags & IPRANGE_DST) { | |
40 | m = ntohl(iph->daddr) < ntohl(info->dst_min.ip); | |
41 | m |= ntohl(iph->daddr) > ntohl(info->dst_max.ip); | |
6def1eb4 | 42 | m ^= !!(info->flags & IPRANGE_DST_INV); |
1a50c5a1 | 43 | if (m) { |
14d5e834 HH |
44 | pr_debug("dst IP %pI4 NOT in range %s%pI4-%pI4\n", |
45 | &iph->daddr, | |
1a50c5a1 | 46 | (info->flags & IPRANGE_DST_INV) ? "(INV) " : "", |
14d5e834 HH |
47 | &info->dst_min.ip, |
48 | &info->dst_max.ip); | |
1a50c5a1 JE |
49 | return false; |
50 | } | |
51 | } | |
52 | return true; | |
53 | } | |
54 | ||
55 | static inline int | |
56 | iprange_ipv6_sub(const struct in6_addr *a, const struct in6_addr *b) | |
57 | { | |
58 | unsigned int i; | |
59 | int r; | |
60 | ||
61 | for (i = 0; i < 4; ++i) { | |
27ecb1ff | 62 | r = ntohl(a->s6_addr32[i]) - ntohl(b->s6_addr32[i]); |
1a50c5a1 JE |
63 | if (r != 0) |
64 | return r; | |
65 | } | |
66 | ||
67 | return 0; | |
68 | } | |
69 | ||
70 | static bool | |
62fc8051 | 71 | iprange_mt6(const struct sk_buff *skb, struct xt_action_param *par) |
1a50c5a1 | 72 | { |
f7108a20 | 73 | const struct xt_iprange_mtinfo *info = par->matchinfo; |
1a50c5a1 JE |
74 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
75 | bool m; | |
76 | ||
77 | if (info->flags & IPRANGE_SRC) { | |
78 | m = iprange_ipv6_sub(&iph->saddr, &info->src_min.in6) < 0; | |
79 | m |= iprange_ipv6_sub(&iph->saddr, &info->src_max.in6) > 0; | |
6def1eb4 | 80 | m ^= !!(info->flags & IPRANGE_SRC_INV); |
1a50c5a1 JE |
81 | if (m) |
82 | return false; | |
83 | } | |
84 | if (info->flags & IPRANGE_DST) { | |
85 | m = iprange_ipv6_sub(&iph->daddr, &info->dst_min.in6) < 0; | |
86 | m |= iprange_ipv6_sub(&iph->daddr, &info->dst_max.in6) > 0; | |
6def1eb4 | 87 | m ^= !!(info->flags & IPRANGE_DST_INV); |
1a50c5a1 JE |
88 | if (m) |
89 | return false; | |
90 | } | |
91 | return true; | |
92 | } | |
93 | ||
94 | static struct xt_match iprange_mt_reg[] __read_mostly = { | |
1a50c5a1 JE |
95 | { |
96 | .name = "iprange", | |
97 | .revision = 1, | |
ee999d8b | 98 | .family = NFPROTO_IPV4, |
1a50c5a1 JE |
99 | .match = iprange_mt4, |
100 | .matchsize = sizeof(struct xt_iprange_mtinfo), | |
101 | .me = THIS_MODULE, | |
102 | }, | |
103 | { | |
104 | .name = "iprange", | |
105 | .revision = 1, | |
ee999d8b | 106 | .family = NFPROTO_IPV6, |
1a50c5a1 JE |
107 | .match = iprange_mt6, |
108 | .matchsize = sizeof(struct xt_iprange_mtinfo), | |
109 | .me = THIS_MODULE, | |
110 | }, | |
1da177e4 LT |
111 | }; |
112 | ||
d3c5ee6d | 113 | static int __init iprange_mt_init(void) |
1da177e4 | 114 | { |
1a50c5a1 | 115 | return xt_register_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg)); |
1da177e4 LT |
116 | } |
117 | ||
d3c5ee6d | 118 | static void __exit iprange_mt_exit(void) |
1da177e4 | 119 | { |
1a50c5a1 | 120 | xt_unregister_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg)); |
1da177e4 LT |
121 | } |
122 | ||
d3c5ee6d JE |
123 | module_init(iprange_mt_init); |
124 | module_exit(iprange_mt_exit); | |
f72e25a8 | 125 | MODULE_LICENSE("GPL"); |
36d4084d JE |
126 | MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); |
127 | MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>"); | |
f72e25a8 | 128 | MODULE_DESCRIPTION("Xtables: arbitrary IPv4 range matching"); |
01b7a314 PO |
129 | MODULE_ALIAS("ipt_iprange"); |
130 | MODULE_ALIAS("ip6t_iprange"); |