[deliverable/linux.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>

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