[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.
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#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, struct xt_action_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, struct xt_action_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	10	*/
ff67e4e4	11	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
1da177e4 LT	12	#include <linux/module.h>
	13	#include <linux/skbuff.h>
	14	#include <linux/ip.h>
1a50c5a1	15	#include <linux/ipv6.h>
6709dbbb	16	#include <linux/netfilter/x_tables.h>
5da621f1	17	#include <linux/netfilter/xt_iprange.h>
1da177e4	18
1a50c5a1	19	static bool
62fc8051	20	iprange_mt4(const struct sk_buff skb, struct xt_action_param par)
1a50c5a1	21	{
f7108a20	22	const struct xt_iprange_mtinfo *info = par->matchinfo;
1a50c5a1 JE	23	const struct iphdr *iph = ip_hdr(skb);
	24	bool m;
	25
	26	if (info->flags & IPRANGE_SRC) {
	27	m = ntohl(iph->saddr) < ntohl(info->src_min.ip);
	28	m \|= ntohl(iph->saddr) > ntohl(info->src_max.ip);
6def1eb4	29	m ^= !!(info->flags & IPRANGE_SRC_INV);
1a50c5a1	30	if (m) {
14d5e834 HH	31	pr_debug("src IP %pI4 NOT in range %s%pI4-%pI4\n",
14d5e834 HH	32	&iph->saddr,
1a50c5a1	33	(info->flags & IPRANGE_SRC_INV) ? "(INV) " : "",
14d5e834 HH	34	&info->src_max.ip,
14d5e834 HH	35	&info->src_max.ip);
1a50c5a1 JE	36	return false;
	37	}
	38	}
	39	if (info->flags & IPRANGE_DST) {
	40	m = ntohl(iph->daddr) < ntohl(info->dst_min.ip);
	41	m \|= ntohl(iph->daddr) > ntohl(info->dst_max.ip);
6def1eb4	42	m ^= !!(info->flags & IPRANGE_DST_INV);
1a50c5a1	43	if (m) {
14d5e834 HH	44	pr_debug("dst IP %pI4 NOT in range %s%pI4-%pI4\n",
14d5e834 HH	45	&iph->daddr,
1a50c5a1	46	(info->flags & IPRANGE_DST_INV) ? "(INV) " : "",
14d5e834 HH	47	&info->dst_min.ip,
14d5e834 HH	48	&info->dst_max.ip);
1a50c5a1 JE	49	return false;
	50	}
	51	}
	52	return true;
	53	}
	54
	55	static inline int
	56	iprange_ipv6_sub(const struct in6_addr a, const struct in6_addr b)
	57	{
	58	unsigned int i;
	59	int r;
	60
	61	for (i = 0; i < 4; ++i) {
27ecb1ff	62	r = ntohl(a->s6_addr32[i]) - ntohl(b->s6_addr32[i]);
1a50c5a1 JE	63	if (r != 0)
	64	return r;
	65	}
	66
	67	return 0;
	68	}
	69
	70	static bool
62fc8051	71	iprange_mt6(const struct sk_buff skb, struct xt_action_param par)
1a50c5a1	72	{
f7108a20	73	const struct xt_iprange_mtinfo *info = par->matchinfo;
1a50c5a1 JE	74	const struct ipv6hdr *iph = ipv6_hdr(skb);
	75	bool m;
	76
	77	if (info->flags & IPRANGE_SRC) {
	78	m = iprange_ipv6_sub(&iph->saddr, &info->src_min.in6) < 0;
	79	m \|= iprange_ipv6_sub(&iph->saddr, &info->src_max.in6) > 0;
6def1eb4	80	m ^= !!(info->flags & IPRANGE_SRC_INV);
1a50c5a1 JE	81	if (m)
	82	return false;
	83	}
	84	if (info->flags & IPRANGE_DST) {
	85	m = iprange_ipv6_sub(&iph->daddr, &info->dst_min.in6) < 0;
	86	m \|= iprange_ipv6_sub(&iph->daddr, &info->dst_max.in6) > 0;
6def1eb4	87	m ^= !!(info->flags & IPRANGE_DST_INV);
1a50c5a1 JE	88	if (m)
	89	return false;
	90	}
	91	return true;
	92	}
	93
	94	static struct xt_match iprange_mt_reg[] __read_mostly = {
1a50c5a1 JE	95	{
	96	.name = "iprange",
	97	.revision = 1,
ee999d8b	98	.family = NFPROTO_IPV4,
1a50c5a1 JE	99	.match = iprange_mt4,
	100	.matchsize = sizeof(struct xt_iprange_mtinfo),
	101	.me = THIS_MODULE,
	102	},
	103	{
	104	.name = "iprange",
	105	.revision = 1,
ee999d8b	106	.family = NFPROTO_IPV6,
1a50c5a1 JE	107	.match = iprange_mt6,
	108	.matchsize = sizeof(struct xt_iprange_mtinfo),
	109	.me = THIS_MODULE,
	110	},
1da177e4 LT	111	};
1da177e4 LT	112
d3c5ee6d	113	static int __init iprange_mt_init(void)
1da177e4	114	{
1a50c5a1	115	return xt_register_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg));
1da177e4 LT	116	}
1da177e4 LT	117
d3c5ee6d	118	static void __exit iprange_mt_exit(void)
1da177e4	119	{
1a50c5a1	120	xt_unregister_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg));
1da177e4 LT	121	}
1da177e4 LT	122
d3c5ee6d JE	123	module_init(iprange_mt_init);
d3c5ee6d JE	124	module_exit(iprange_mt_exit);
f72e25a8	125	MODULE_LICENSE("GPL");
36d4084d JE	126	MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
36d4084d JE	127	MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>");
f72e25a8	128	MODULE_DESCRIPTION("Xtables: arbitrary IPv4 range matching");
01b7a314 PO	129	MODULE_ALIAS("ipt_iprange");
01b7a314 PO	130	MODULE_ALIAS("ip6t_iprange");