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[linux-2.6/mini2440.git] / net / netfilter / xt_iprange.c
blob501f9b6231886cb21fcf112f8fbbf01ed8ca2a76
1 /*
2 * xt_iprange - Netfilter module to match IP address ranges
4 * (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
5 * (C) CC Computer Consultants GmbH, 2008
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.
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 #include <linux/netfilter_ipv4/ipt_iprange.h>
19 static bool
20 iprange_mt_v0(const struct sk_buff *skb, const struct xt_match_param *par)
22 const struct ipt_iprange_info *info = par->matchinfo;
23 const struct iphdr *iph = ip_hdr(skb);
25 if (info->flags & IPRANGE_SRC) {
26 if ((ntohl(iph->saddr) < ntohl(info->src.min_ip)
27 || ntohl(iph->saddr) > ntohl(info->src.max_ip))
28 ^ !!(info->flags & IPRANGE_SRC_INV)) {
29 pr_debug("src IP %pI4 NOT in range %s%pI4-%pI4\n",
30 &iph->saddr,
31 info->flags & IPRANGE_SRC_INV ? "(INV) " : "",
32 &info->src.min_ip,
33 &info->src.max_ip);
34 return false;
37 if (info->flags & IPRANGE_DST) {
38 if ((ntohl(iph->daddr) < ntohl(info->dst.min_ip)
39 || ntohl(iph->daddr) > ntohl(info->dst.max_ip))
40 ^ !!(info->flags & IPRANGE_DST_INV)) {
41 pr_debug("dst IP %pI4 NOT in range %s%pI4-%pI4\n",
42 &iph->daddr,
43 info->flags & IPRANGE_DST_INV ? "(INV) " : "",
44 &info->dst.min_ip,
45 &info->dst.max_ip);
46 return false;
49 return true;
52 static bool
53 iprange_mt4(const struct sk_buff *skb, const struct xt_match_param *par)
55 const struct xt_iprange_mtinfo *info = par->matchinfo;
56 const struct iphdr *iph = ip_hdr(skb);
57 bool m;
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);
62 m ^= !!(info->flags & IPRANGE_SRC_INV);
63 if (m) {
64 pr_debug("src IP %pI4 NOT in range %s%pI4-%pI4\n",
65 &iph->saddr,
66 (info->flags & IPRANGE_SRC_INV) ? "(INV) " : "",
67 &info->src_max.ip,
68 &info->src_max.ip);
69 return false;
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);
75 m ^= !!(info->flags & IPRANGE_DST_INV);
76 if (m) {
77 pr_debug("dst IP %pI4 NOT in range %s%pI4-%pI4\n",
78 &iph->daddr,
79 (info->flags & IPRANGE_DST_INV) ? "(INV) " : "",
80 &info->dst_min.ip,
81 &info->dst_max.ip);
82 return false;
85 return true;
88 static inline int
89 iprange_ipv6_sub(const struct in6_addr *a, const struct in6_addr *b)
91 unsigned int i;
92 int r;
94 for (i = 0; i < 4; ++i) {
95 r = ntohl(a->s6_addr32[i]) - ntohl(b->s6_addr32[i]);
96 if (r != 0)
97 return r;
100 return 0;
103 static bool
104 iprange_mt6(const struct sk_buff *skb, const struct xt_match_param *par)
106 const struct xt_iprange_mtinfo *info = par->matchinfo;
107 const struct ipv6hdr *iph = ipv6_hdr(skb);
108 bool m;
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;
113 m ^= !!(info->flags & IPRANGE_SRC_INV);
114 if (m)
115 return false;
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;
120 m ^= !!(info->flags & IPRANGE_DST_INV);
121 if (m)
122 return false;
124 return true;
127 static struct xt_match iprange_mt_reg[] __read_mostly = {
129 .name = "iprange",
130 .revision = 0,
131 .family = NFPROTO_IPV4,
132 .match = iprange_mt_v0,
133 .matchsize = sizeof(struct ipt_iprange_info),
134 .me = THIS_MODULE,
137 .name = "iprange",
138 .revision = 1,
139 .family = NFPROTO_IPV4,
140 .match = iprange_mt4,
141 .matchsize = sizeof(struct xt_iprange_mtinfo),
142 .me = THIS_MODULE,
145 .name = "iprange",
146 .revision = 1,
147 .family = NFPROTO_IPV6,
148 .match = iprange_mt6,
149 .matchsize = sizeof(struct xt_iprange_mtinfo),
150 .me = THIS_MODULE,
154 static int __init iprange_mt_init(void)
156 return xt_register_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg));
159 static void __exit iprange_mt_exit(void)
161 xt_unregister_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg));
164 module_init(iprange_mt_init);
165 module_exit(iprange_mt_exit);
166 MODULE_LICENSE("GPL");
167 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>, Jan Engelhardt <jengelh@computergmbh.de>");
168 MODULE_DESCRIPTION("Xtables: arbitrary IPv4 range matching");
169 MODULE_ALIAS("ipt_iprange");
170 MODULE_ALIAS("ip6t_iprange");