[net-next-2.6.git] / net / bridge / netfilter / ebt_ip6.c

/*
 *  ebt_ip6
 *
 *	Authors:
 *	Manohar Castelino <manohar.r.castelino@intel.com>
 *	Kuo-Lang Tseng <kuo-lang.tseng@intel.com>
 *	Jan Engelhardt <jengelh@computergmbh.de>
 *
 * Summary:
 * This is just a modification of the IPv4 code written by
 * Bart De Schuymer <bdschuym@pandora.be>
 * with the changes required to support IPv6
 *
 *  Jan, 2008
 */
#include <linux/ipv6.h>
#include <net/ipv6.h>
#include <linux/in.h>
#include <linux/module.h>
#include <net/dsfield.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_bridge/ebtables.h>
#include <linux/netfilter_bridge/ebt_ip6.h>

struct tcpudphdr {
	__be16 src;
	__be16 dst;
};

static bool
ebt_ip6_mt(const struct sk_buff *skb, const struct xt_match_param *par)
{
	const struct ebt_ip6_info *info = par->matchinfo;
	const struct ipv6hdr *ih6;
	struct ipv6hdr _ip6h;
	const struct tcpudphdr *pptr;
	struct tcpudphdr _ports;
	struct in6_addr tmp_addr;
	int i;

	ih6 = skb_header_pointer(skb, 0, sizeof(_ip6h), &_ip6h);
	if (ih6 == NULL)
		return false;
	if (info->bitmask & EBT_IP6_TCLASS &&
	   FWINV(info->tclass != ipv6_get_dsfield(ih6), EBT_IP6_TCLASS))
		return false;
	for (i = 0; i < 4; i++)
		tmp_addr.in6_u.u6_addr32[i] = ih6->saddr.in6_u.u6_addr32[i] &
			info->smsk.in6_u.u6_addr32[i];
	if (info->bitmask & EBT_IP6_SOURCE &&
		FWINV((ipv6_addr_cmp(&tmp_addr, &info->saddr) != 0),
			EBT_IP6_SOURCE))
		return false;
	for (i = 0; i < 4; i++)
		tmp_addr.in6_u.u6_addr32[i] = ih6->daddr.in6_u.u6_addr32[i] &
			info->dmsk.in6_u.u6_addr32[i];
	if (info->bitmask & EBT_IP6_DEST &&
	   FWINV((ipv6_addr_cmp(&tmp_addr, &info->daddr) != 0), EBT_IP6_DEST))
		return false;
	if (info->bitmask & EBT_IP6_PROTO) {
		uint8_t nexthdr = ih6->nexthdr;
		int offset_ph;

		offset_ph = ipv6_skip_exthdr(skb, sizeof(_ip6h), &nexthdr);
		if (offset_ph == -1)
			return false;
		if (FWINV(info->protocol != nexthdr, EBT_IP6_PROTO))
			return false;
		if (!(info->bitmask & EBT_IP6_DPORT) &&
		    !(info->bitmask & EBT_IP6_SPORT))
			return true;
		pptr = skb_header_pointer(skb, offset_ph, sizeof(_ports),
					  &_ports);
		if (pptr == NULL)
			return false;
		if (info->bitmask & EBT_IP6_DPORT) {
			u32 dst = ntohs(pptr->dst);
			if (FWINV(dst < info->dport[0] ||
				  dst > info->dport[1], EBT_IP6_DPORT))
				return false;
		}
		if (info->bitmask & EBT_IP6_SPORT) {
			u32 src = ntohs(pptr->src);
			if (FWINV(src < info->sport[0] ||
				  src > info->sport[1], EBT_IP6_SPORT))
			return false;
		}
		return true;
	}
	return true;
}

static bool ebt_ip6_mt_check(const struct xt_mtchk_param *par)
{
	const struct ebt_entry *e = par->entryinfo;
	struct ebt_ip6_info *info = par->matchinfo;

	if (e->ethproto != htons(ETH_P_IPV6) || e->invflags & EBT_IPROTO)
		return false;
	if (info->bitmask & ~EBT_IP6_MASK || info->invflags & ~EBT_IP6_MASK)
		return false;
	if (info->bitmask & (EBT_IP6_DPORT | EBT_IP6_SPORT)) {
		if (info->invflags & EBT_IP6_PROTO)
			return false;
		if (info->protocol != IPPROTO_TCP &&
		    info->protocol != IPPROTO_UDP &&
		    info->protocol != IPPROTO_UDPLITE &&
		    info->protocol != IPPROTO_SCTP &&
		    info->protocol != IPPROTO_DCCP)
			return false;
	}
	if (info->bitmask & EBT_IP6_DPORT && info->dport[0] > info->dport[1])
		return false;
	if (info->bitmask & EBT_IP6_SPORT && info->sport[0] > info->sport[1])
		return false;
	return true;
}

static struct xt_match ebt_ip6_mt_reg __read_mostly = {
	.name		= "ip6",
	.revision	= 0,
	.family		= NFPROTO_BRIDGE,
	.match		= ebt_ip6_mt,
	.checkentry	= ebt_ip6_mt_check,
	.matchsize	= XT_ALIGN(sizeof(struct ebt_ip6_info)),
	.me		= THIS_MODULE,
};

static int __init ebt_ip6_init(void)
{
	return xt_register_match(&ebt_ip6_mt_reg);
}

static void __exit ebt_ip6_fini(void)
{
	xt_unregister_match(&ebt_ip6_mt_reg);
}

module_init(ebt_ip6_init);
module_exit(ebt_ip6_fini);
MODULE_DESCRIPTION("Ebtables: IPv6 protocol packet match");
MODULE_LICENSE("GPL");
Commit	Line	Data
93f65158 KT	1	/*
	2	* ebt_ip6
	3	*
	4	* Authors:
	5	* Manohar Castelino <manohar.r.castelino@intel.com>
	6	* Kuo-Lang Tseng <kuo-lang.tseng@intel.com>
	7	* Jan Engelhardt <jengelh@computergmbh.de>
	8	*
	9	* Summary:
	10	* This is just a modification of the IPv4 code written by
	11	* Bart De Schuymer <bdschuym@pandora.be>
	12	* with the changes required to support IPv6
	13	*
	14	* Jan, 2008
	15	*/
93f65158 KT	16	#include <linux/ipv6.h>
	17	#include <net/ipv6.h>
	18	#include <linux/in.h>
	19	#include <linux/module.h>
	20	#include <net/dsfield.h>
18219d3f JE	21	#include <linux/netfilter/x_tables.h>
	22	#include <linux/netfilter_bridge/ebtables.h>
	23	#include <linux/netfilter_bridge/ebt_ip6.h>
93f65158 KT	24
	25	struct tcpudphdr {
	26	__be16 src;
	27	__be16 dst;
	28	};
	29
2d06d4a5	30	static bool
f7108a20	31	ebt_ip6_mt(const struct sk_buff skb, const struct xt_match_param par)
93f65158	32	{
f7108a20	33	const struct ebt_ip6_info *info = par->matchinfo;
93f65158 KT	34	const struct ipv6hdr *ih6;
	35	struct ipv6hdr _ip6h;
	36	const struct tcpudphdr *pptr;
	37	struct tcpudphdr _ports;
	38	struct in6_addr tmp_addr;
	39	int i;
	40
	41	ih6 = skb_header_pointer(skb, 0, sizeof(_ip6h), &_ip6h);
	42	if (ih6 == NULL)
8cc784ee	43	return false;
93f65158 KT	44	if (info->bitmask & EBT_IP6_TCLASS &&
93f65158 KT	45	FWINV(info->tclass != ipv6_get_dsfield(ih6), EBT_IP6_TCLASS))
8cc784ee	46	return false;
93f65158 KT	47	for (i = 0; i < 4; i++)
	48	tmp_addr.in6_u.u6_addr32[i] = ih6->saddr.in6_u.u6_addr32[i] &
	49	info->smsk.in6_u.u6_addr32[i];
	50	if (info->bitmask & EBT_IP6_SOURCE &&
	51	FWINV((ipv6_addr_cmp(&tmp_addr, &info->saddr) != 0),
	52	EBT_IP6_SOURCE))
8cc784ee	53	return false;
93f65158 KT	54	for (i = 0; i < 4; i++)
	55	tmp_addr.in6_u.u6_addr32[i] = ih6->daddr.in6_u.u6_addr32[i] &
	56	info->dmsk.in6_u.u6_addr32[i];
	57	if (info->bitmask & EBT_IP6_DEST &&
	58	FWINV((ipv6_addr_cmp(&tmp_addr, &info->daddr) != 0), EBT_IP6_DEST))
8cc784ee	59	return false;
93f65158 KT	60	if (info->bitmask & EBT_IP6_PROTO) {
	61	uint8_t nexthdr = ih6->nexthdr;
	62	int offset_ph;
	63
	64	offset_ph = ipv6_skip_exthdr(skb, sizeof(_ip6h), &nexthdr);
	65	if (offset_ph == -1)
8cc784ee	66	return false;
93f65158	67	if (FWINV(info->protocol != nexthdr, EBT_IP6_PROTO))
8cc784ee	68	return false;
93f65158 KT	69	if (!(info->bitmask & EBT_IP6_DPORT) &&
93f65158 KT	70	!(info->bitmask & EBT_IP6_SPORT))
8cc784ee	71	return true;
93f65158 KT	72	pptr = skb_header_pointer(skb, offset_ph, sizeof(_ports),
	73	&_ports);
	74	if (pptr == NULL)
8cc784ee	75	return false;
93f65158 KT	76	if (info->bitmask & EBT_IP6_DPORT) {
	77	u32 dst = ntohs(pptr->dst);
	78	if (FWINV(dst < info->dport[0] \|\|
	79	dst > info->dport[1], EBT_IP6_DPORT))
8cc784ee	80	return false;
93f65158 KT	81	}
	82	if (info->bitmask & EBT_IP6_SPORT) {
	83	u32 src = ntohs(pptr->src);
	84	if (FWINV(src < info->sport[0] \|\|
	85	src > info->sport[1], EBT_IP6_SPORT))
8cc784ee	86	return false;
93f65158	87	}
8cc784ee	88	return true;
93f65158	89	}
8cc784ee	90	return true;
93f65158 KT	91	}
93f65158 KT	92
9b4fce7a	93	static bool ebt_ip6_mt_check(const struct xt_mtchk_param *par)
93f65158	94	{
9b4fce7a JE	95	const struct ebt_entry *e = par->entryinfo;
9b4fce7a JE	96	struct ebt_ip6_info *info = par->matchinfo;
93f65158	97
93f65158	98	if (e->ethproto != htons(ETH_P_IPV6) \|\| e->invflags & EBT_IPROTO)
19eda879	99	return false;
93f65158	100	if (info->bitmask & ~EBT_IP6_MASK \|\| info->invflags & ~EBT_IP6_MASK)
19eda879	101	return false;
93f65158 KT	102	if (info->bitmask & (EBT_IP6_DPORT \| EBT_IP6_SPORT)) {
93f65158 KT	103	if (info->invflags & EBT_IP6_PROTO)
19eda879	104	return false;
93f65158 KT	105	if (info->protocol != IPPROTO_TCP &&
	106	info->protocol != IPPROTO_UDP &&
	107	info->protocol != IPPROTO_UDPLITE &&
	108	info->protocol != IPPROTO_SCTP &&
	109	info->protocol != IPPROTO_DCCP)
19eda879	110	return false;
93f65158 KT	111	}
93f65158 KT	112	if (info->bitmask & EBT_IP6_DPORT && info->dport[0] > info->dport[1])
19eda879	113	return false;
93f65158	114	if (info->bitmask & EBT_IP6_SPORT && info->sport[0] > info->sport[1])
19eda879 JE	115	return false;
19eda879 JE	116	return true;
93f65158 KT	117	}
93f65158 KT	118
043ef46c JE	119	static struct xt_match ebt_ip6_mt_reg __read_mostly = {
043ef46c JE	120	.name = "ip6",
001a18d3 JE	121	.revision = 0,
001a18d3 JE	122	.family = NFPROTO_BRIDGE,
2d06d4a5 JE	123	.match = ebt_ip6_mt,
2d06d4a5 JE	124	.checkentry = ebt_ip6_mt_check,
18219d3f	125	.matchsize = XT_ALIGN(sizeof(struct ebt_ip6_info)),
93f65158 KT	126	.me = THIS_MODULE,
	127	};
	128
	129	static int __init ebt_ip6_init(void)
	130	{
043ef46c	131	return xt_register_match(&ebt_ip6_mt_reg);
93f65158 KT	132	}
	133
	134	static void __exit ebt_ip6_fini(void)
	135	{
043ef46c	136	xt_unregister_match(&ebt_ip6_mt_reg);
93f65158 KT	137	}
	138
	139	module_init(ebt_ip6_init);
	140	module_exit(ebt_ip6_fini);
	141	MODULE_DESCRIPTION("Ebtables: IPv6 protocol packet match");
	142	MODULE_LICENSE("GPL");