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>
14 #include <linux/ipv6.h>
15 #include <linux/netfilter/x_tables.h>
16 #include <linux/netfilter/xt_iprange.h>
19 iprange_mt4(const struct sk_buff *skb, const struct xt_match_param *par)
21 const struct xt_iprange_mtinfo *info = par->matchinfo;
22 const struct iphdr *iph = ip_hdr(skb);
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);
30 pr_debug("src IP %pI4 NOT in range %s%pI4-%pI4\n",
32 (info->flags & IPRANGE_SRC_INV) ? "(INV) " : "",
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);
43 pr_debug("dst IP %pI4 NOT in range %s%pI4-%pI4\n",
45 (info->flags & IPRANGE_DST_INV) ? "(INV) " : "",
55 iprange_ipv6_sub(const struct in6_addr *a, const struct in6_addr *b)
60 for (i = 0; i < 4; ++i) {
61 r = ntohl(a->s6_addr32[i]) - ntohl(b->s6_addr32[i]);
70 iprange_mt6(const struct sk_buff *skb, const struct xt_match_param *par)
72 const struct xt_iprange_mtinfo *info = par->matchinfo;
73 const struct ipv6hdr *iph = ipv6_hdr(skb);
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);
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);
93 static struct xt_match iprange_mt_reg[] __read_mostly = {
97 .family = NFPROTO_IPV4,
99 .matchsize = sizeof(struct xt_iprange_mtinfo),
105 .family = NFPROTO_IPV6,
106 .match = iprange_mt6,
107 .matchsize = sizeof(struct xt_iprange_mtinfo),
112 static int __init iprange_mt_init(void)
114 return xt_register_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg));
117 static void __exit iprange_mt_exit(void)
119 xt_unregister_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg));
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");