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140 lines
3.8 KiB
C
140 lines
3.8 KiB
C
/*
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* xt_iprange - Netfilter module to match IP address ranges
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*
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* (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
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* (C) CC Computer Consultants GmbH, 2008
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter/xt_iprange.h>
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static bool
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iprange_mt4(const struct sk_buff *skb, struct xt_action_param *par)
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{
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const struct xt_iprange_mtinfo *info = par->matchinfo;
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const struct iphdr *iph = ip_hdr(skb);
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bool m;
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if (info->flags & IPRANGE_SRC) {
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m = ntohl(iph->saddr) < ntohl(info->src_min.ip);
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m |= ntohl(iph->saddr) > ntohl(info->src_max.ip);
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m ^= !!(info->flags & IPRANGE_SRC_INV);
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if (m) {
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pr_debug("src IP %pI4 NOT in range %s%pI4-%pI4\n",
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&iph->saddr,
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(info->flags & IPRANGE_SRC_INV) ? "(INV) " : "",
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&info->src_min.ip,
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&info->src_max.ip);
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return false;
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}
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}
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if (info->flags & IPRANGE_DST) {
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m = ntohl(iph->daddr) < ntohl(info->dst_min.ip);
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m |= ntohl(iph->daddr) > ntohl(info->dst_max.ip);
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m ^= !!(info->flags & IPRANGE_DST_INV);
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if (m) {
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pr_debug("dst IP %pI4 NOT in range %s%pI4-%pI4\n",
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&iph->daddr,
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(info->flags & IPRANGE_DST_INV) ? "(INV) " : "",
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&info->dst_min.ip,
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&info->dst_max.ip);
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return false;
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}
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}
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return true;
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}
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static inline int
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iprange_ipv6_lt(const struct in6_addr *a, const struct in6_addr *b)
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{
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unsigned int i;
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for (i = 0; i < 4; ++i) {
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if (a->s6_addr32[i] != b->s6_addr32[i])
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return ntohl(a->s6_addr32[i]) < ntohl(b->s6_addr32[i]);
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}
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return 0;
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}
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static bool
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iprange_mt6(const struct sk_buff *skb, struct xt_action_param *par)
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{
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const struct xt_iprange_mtinfo *info = par->matchinfo;
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const struct ipv6hdr *iph = ipv6_hdr(skb);
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bool m;
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if (info->flags & IPRANGE_SRC) {
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m = iprange_ipv6_lt(&iph->saddr, &info->src_min.in6);
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m |= iprange_ipv6_lt(&info->src_max.in6, &iph->saddr);
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m ^= !!(info->flags & IPRANGE_SRC_INV);
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if (m) {
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pr_debug("src IP %pI6 NOT in range %s%pI6-%pI6\n",
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&iph->saddr,
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(info->flags & IPRANGE_SRC_INV) ? "(INV) " : "",
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&info->src_min.in6,
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&info->src_max.in6);
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return false;
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}
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}
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if (info->flags & IPRANGE_DST) {
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m = iprange_ipv6_lt(&iph->daddr, &info->dst_min.in6);
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m |= iprange_ipv6_lt(&info->dst_max.in6, &iph->daddr);
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m ^= !!(info->flags & IPRANGE_DST_INV);
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if (m) {
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pr_debug("dst IP %pI6 NOT in range %s%pI6-%pI6\n",
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&iph->daddr,
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(info->flags & IPRANGE_DST_INV) ? "(INV) " : "",
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&info->dst_min.in6,
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&info->dst_max.in6);
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return false;
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}
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}
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return true;
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}
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static struct xt_match iprange_mt_reg[] __read_mostly = {
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{
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.name = "iprange",
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.revision = 1,
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.family = NFPROTO_IPV4,
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.match = iprange_mt4,
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.matchsize = sizeof(struct xt_iprange_mtinfo),
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.me = THIS_MODULE,
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},
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{
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.name = "iprange",
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.revision = 1,
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.family = NFPROTO_IPV6,
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.match = iprange_mt6,
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.matchsize = sizeof(struct xt_iprange_mtinfo),
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.me = THIS_MODULE,
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},
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};
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static int __init iprange_mt_init(void)
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{
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return xt_register_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg));
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}
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static void __exit iprange_mt_exit(void)
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{
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xt_unregister_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg));
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}
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module_init(iprange_mt_init);
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module_exit(iprange_mt_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
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MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>");
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MODULE_DESCRIPTION("Xtables: arbitrary IPv4 range matching");
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MODULE_ALIAS("ipt_iprange");
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MODULE_ALIAS("ip6t_iprange");
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