[net-next-2.6.git] / net / netfilter / xt_iprange.c

/*
 *	xt_iprange - Netfilter module to match IP address ranges
 *
 *	(C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
 *	(C) CC Computer Consultants GmbH, 2008
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License version 2 as
 *	published by the Free Software Foundation.
 */
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_iprange.h>
#include <linux/netfilter_ipv4/ipt_iprange.h>

static bool
iprange_mt_v0(const struct sk_buff *skb, const struct xt_match_param *par)
{
	const struct ipt_iprange_info *info = par->matchinfo;
	const struct iphdr *iph = ip_hdr(skb);

	if (info->flags & IPRANGE_SRC) {
		if ((ntohl(iph->saddr) < ntohl(info->src.min_ip)
			  || ntohl(iph->saddr) > ntohl(info->src.max_ip))
			 ^ !!(info->flags & IPRANGE_SRC_INV)) {
			pr_debug("src IP %pI4 NOT in range %s%pI4-%pI4\n",
				 &iph->saddr,
				 info->flags & IPRANGE_SRC_INV ? "(INV) " : "",
				 &info->src.min_ip,
				 &info->src.max_ip);
			return false;
		}
	}
	if (info->flags & IPRANGE_DST) {
		if ((ntohl(iph->daddr) < ntohl(info->dst.min_ip)
			  || ntohl(iph->daddr) > ntohl(info->dst.max_ip))
			 ^ !!(info->flags & IPRANGE_DST_INV)) {
			pr_debug("dst IP %pI4 NOT in range %s%pI4-%pI4\n",
				 &iph->daddr,
				 info->flags & IPRANGE_DST_INV ? "(INV) " : "",
				 &info->dst.min_ip,
				 &info->dst.max_ip);
			return false;
		}
	}
	return true;
}

static bool
iprange_mt4(const struct sk_buff *skb, const struct xt_match_param *par)
{
	const struct xt_iprange_mtinfo *info = par->matchinfo;
	const struct iphdr *iph = ip_hdr(skb);
	bool m;

	if (info->flags & IPRANGE_SRC) {
		m  = ntohl(iph->saddr) < ntohl(info->src_min.ip);
		m |= ntohl(iph->saddr) > ntohl(info->src_max.ip);
		m ^= !!(info->flags & IPRANGE_SRC_INV);
		if (m) {
			pr_debug("src IP %pI4 NOT in range %s%pI4-%pI4\n",
			         &iph->saddr,
			         (info->flags & IPRANGE_SRC_INV) ? "(INV) " : "",
			         &info->src_max.ip,
			         &info->src_max.ip);
			return false;
		}
	}
	if (info->flags & IPRANGE_DST) {
		m  = ntohl(iph->daddr) < ntohl(info->dst_min.ip);
		m |= ntohl(iph->daddr) > ntohl(info->dst_max.ip);
		m ^= !!(info->flags & IPRANGE_DST_INV);
		if (m) {
			pr_debug("dst IP %pI4 NOT in range %s%pI4-%pI4\n",
			         &iph->daddr,
			         (info->flags & IPRANGE_DST_INV) ? "(INV) " : "",
			         &info->dst_min.ip,
			         &info->dst_max.ip);
			return false;
		}
	}
	return true;
}

static inline int
iprange_ipv6_sub(const struct in6_addr *a, const struct in6_addr *b)
{
	unsigned int i;
	int r;

	for (i = 0; i < 4; ++i) {
		r = ntohl(a->s6_addr32[i]) - ntohl(b->s6_addr32[i]);
		if (r != 0)
			return r;
	}

	return 0;
}

static bool
iprange_mt6(const struct sk_buff *skb, const struct xt_match_param *par)
{
	const struct xt_iprange_mtinfo *info = par->matchinfo;
	const struct ipv6hdr *iph = ipv6_hdr(skb);
	bool m;

	if (info->flags & IPRANGE_SRC) {
		m  = iprange_ipv6_sub(&iph->saddr, &info->src_min.in6) < 0;
		m |= iprange_ipv6_sub(&iph->saddr, &info->src_max.in6) > 0;
		m ^= !!(info->flags & IPRANGE_SRC_INV);
		if (m)
			return false;
	}
	if (info->flags & IPRANGE_DST) {
		m  = iprange_ipv6_sub(&iph->daddr, &info->dst_min.in6) < 0;
		m |= iprange_ipv6_sub(&iph->daddr, &info->dst_max.in6) > 0;
		m ^= !!(info->flags & IPRANGE_DST_INV);
		if (m)
			return false;
	}
	return true;
}

static struct xt_match iprange_mt_reg[] __read_mostly = {
	{
		.name      = "iprange",
		.revision  = 0,
		.family    = NFPROTO_IPV4,
		.match     = iprange_mt_v0,
		.matchsize = sizeof(struct ipt_iprange_info),
		.me        = THIS_MODULE,
	},
	{
		.name      = "iprange",
		.revision  = 1,
		.family    = NFPROTO_IPV4,
		.match     = iprange_mt4,
		.matchsize = sizeof(struct xt_iprange_mtinfo),
		.me        = THIS_MODULE,
	},
	{
		.name      = "iprange",
		.revision  = 1,
		.family    = NFPROTO_IPV6,
		.match     = iprange_mt6,
		.matchsize = sizeof(struct xt_iprange_mtinfo),
		.me        = THIS_MODULE,
	},
};

static int __init iprange_mt_init(void)
{
	return xt_register_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg));
}

static void __exit iprange_mt_exit(void)
{
	xt_unregister_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg));
}

module_init(iprange_mt_init);
module_exit(iprange_mt_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>, Jan Engelhardt <jengelh@computergmbh.de>");
MODULE_DESCRIPTION("Xtables: arbitrary IPv4 range matching");
MODULE_ALIAS("ipt_iprange");
MODULE_ALIAS("ip6t_iprange");
Commit	Line	Data
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>
1da177e4 LT	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
1da177e4 LT	25	if (info->flags & IPRANGE_SRC) {
7c4e36bc JE	26	if ((ntohl(iph->saddr) < ntohl(info->src.min_ip)
7c4e36bc JE	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",
14d5e834 HH	30	&iph->saddr,
0d53778e	31	info->flags & IPRANGE_SRC_INV ? "(INV) " : "",
14d5e834 HH	32	&info->src.min_ip,
14d5e834 HH	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)
7c4e36bc JE	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",
14d5e834 HH	42	&iph->daddr,
0d53778e	43	info->flags & IPRANGE_DST_INV ? "(INV) " : "",
14d5e834 HH	44	&info->dst.min_ip,
14d5e834 HH	45	&info->dst.max_ip);
1d93a9cb	46	return false;
1da177e4 LT	47	}
1da177e4 LT	48	}
1d93a9cb	49	return true;
1da177e4 LT	50	}
1da177e4 LT	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",
14d5e834 HH	65	&iph->saddr,
1a50c5a1	66	(info->flags & IPRANGE_SRC_INV) ? "(INV) " : "",
14d5e834 HH	67	&info->src_max.ip,
14d5e834 HH	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",
14d5e834 HH	78	&iph->daddr,
1a50c5a1	79	(info->flags & IPRANGE_DST_INV) ? "(INV) " : "",
14d5e834 HH	80	&info->dst_min.ip,
14d5e834 HH	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	};
1da177e4 LT	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	}
1da177e4 LT	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	}
1da177e4 LT	163
d3c5ee6d JE	164	module_init(iprange_mt_init);
d3c5ee6d JE	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");
01b7a314 PO	170	MODULE_ALIAS("ip6t_iprange");