[deliverable/linux.git] / net / netfilter / xt_connlimit.c

/*
 * netfilter module to limit the number of parallel tcp
 * connections per IP address.
 *   (c) 2000 Gerd Knorr <kraxel@bytesex.org>
 *   Nov 2002: Martin Bene <martin.bene@icomedias.com>:
 *		only ignore TIME_WAIT or gone connections
 *   (C) CC Computer Consultants GmbH, 2007
 *
 * based on ...
 *
 * Kernel module to match connection tracking information.
 * GPL (C) 1999  Rusty Russell (rusty@rustcorp.com.au).
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/jhash.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/random.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/netfilter/nf_conntrack_tcp.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_connlimit.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_tuple.h>
#include <net/netfilter/nf_conntrack_zones.h>

/* we will save the tuples of all connections we care about */
struct xt_connlimit_conn {
	struct hlist_node		node;
	struct nf_conntrack_tuple	tuple;
	union nf_inet_addr		addr;
};

struct xt_connlimit_data {
	struct hlist_head	iphash[256];
	spinlock_t		lock;
};

static u_int32_t connlimit_rnd __read_mostly;

static inline unsigned int connlimit_iphash(__be32 addr)
{
	return jhash_1word((__force __u32)addr, connlimit_rnd) & 0xFF;
}

static inline unsigned int
connlimit_iphash6(const union nf_inet_addr *addr,
                  const union nf_inet_addr *mask)
{
	union nf_inet_addr res;
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(addr->ip6); ++i)
		res.ip6[i] = addr->ip6[i] & mask->ip6[i];

	return jhash2((u32 *)res.ip6, ARRAY_SIZE(res.ip6), connlimit_rnd) & 0xFF;
}

static inline bool already_closed(const struct nf_conn *conn)
{
	if (nf_ct_protonum(conn) == IPPROTO_TCP)
		return conn->proto.tcp.state == TCP_CONNTRACK_TIME_WAIT ||
		       conn->proto.tcp.state == TCP_CONNTRACK_CLOSE;
	else
		return 0;
}

static inline unsigned int
same_source_net(const union nf_inet_addr *addr,
		const union nf_inet_addr *mask,
		const union nf_inet_addr *u3, u_int8_t family)
{
	if (family == NFPROTO_IPV4) {
		return (addr->ip & mask->ip) == (u3->ip & mask->ip);
	} else {
		union nf_inet_addr lh, rh;
		unsigned int i;

		for (i = 0; i < ARRAY_SIZE(addr->ip6); ++i) {
			lh.ip6[i] = addr->ip6[i] & mask->ip6[i];
			rh.ip6[i] = u3->ip6[i] & mask->ip6[i];
		}

		return memcmp(&lh.ip6, &rh.ip6, sizeof(lh.ip6)) == 0;
	}
}

static int count_hlist(struct net *net,
		       struct hlist_head *head,
		       const struct nf_conntrack_tuple *tuple,
		       const union nf_inet_addr *addr,
		       const union nf_inet_addr *mask,
		       u_int8_t family)
{
	const struct nf_conntrack_tuple_hash *found;
	struct xt_connlimit_conn *conn;
	struct hlist_node *n;
	struct nf_conn *found_ct;
	bool addit = true;
	int matches = 0;

	rcu_read_lock();

	/* check the saved connections */
	hlist_for_each_entry_safe(conn, n, head, node) {
		found    = nf_conntrack_find_get(net, NF_CT_DEFAULT_ZONE,
						 &conn->tuple);
		found_ct = NULL;

		if (found != NULL)
			found_ct = nf_ct_tuplehash_to_ctrack(found);

		if (found_ct != NULL &&
		    nf_ct_tuple_equal(&conn->tuple, tuple) &&
		    !already_closed(found_ct))
			/*
			 * Just to be sure we have it only once in the list.
			 * We should not see tuples twice unless someone hooks
			 * this into a table without "-p tcp --syn".
			 */
			addit = false;

		if (found == NULL) {
			/* this one is gone */
			hlist_del(&conn->node);
			kfree(conn);
			continue;
		}

		if (already_closed(found_ct)) {
			/*
			 * we do not care about connections which are
			 * closed already -> ditch it
			 */
			nf_ct_put(found_ct);
			hlist_del(&conn->node);
			kfree(conn);
			continue;
		}

		if (same_source_net(addr, mask, &conn->addr, family))
			/* same source network -> be counted! */
			++matches;
		nf_ct_put(found_ct);
	}

	rcu_read_unlock();

	if (addit) {
		/* save the new connection in our list */
		conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
		if (conn == NULL)
			return -ENOMEM;
		conn->tuple = *tuple;
		conn->addr = *addr;
		hlist_add_head(&conn->node, head);
		++matches;
	}

	return matches;
}

static int count_them(struct net *net,
		      struct xt_connlimit_data *data,
		      const struct nf_conntrack_tuple *tuple,
		      const union nf_inet_addr *addr,
		      const union nf_inet_addr *mask,
		      u_int8_t family)
{
	struct hlist_head *hhead;
	int count;
	u32 hash;

	if (family == NFPROTO_IPV6)
		hash = connlimit_iphash6(addr, mask);
	else
		hash = connlimit_iphash(addr->ip & mask->ip);

	hhead = &data->iphash[hash];

	spin_lock_bh(&data->lock);
	count = count_hlist(net, hhead, tuple, addr, mask, family);
	spin_unlock_bh(&data->lock);

	return count;
}

static bool
connlimit_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
	struct net *net = dev_net(par->in ? par->in : par->out);
	const struct xt_connlimit_info *info = par->matchinfo;
	union nf_inet_addr addr;
	struct nf_conntrack_tuple tuple;
	const struct nf_conntrack_tuple *tuple_ptr = &tuple;
	enum ip_conntrack_info ctinfo;
	const struct nf_conn *ct;
	int connections;

	ct = nf_ct_get(skb, &ctinfo);
	if (ct != NULL)
		tuple_ptr = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
	else if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb),
				    par->family, &tuple))
		goto hotdrop;

	if (par->family == NFPROTO_IPV6) {
		const struct ipv6hdr *iph = ipv6_hdr(skb);
		memcpy(&addr.ip6, (info->flags & XT_CONNLIMIT_DADDR) ?
		       &iph->daddr : &iph->saddr, sizeof(addr.ip6));
	} else {
		const struct iphdr *iph = ip_hdr(skb);
		addr.ip = (info->flags & XT_CONNLIMIT_DADDR) ?
			  iph->daddr : iph->saddr;
	}

	connections = count_them(net, info->data, tuple_ptr, &addr,
	                         &info->mask, par->family);

	if (connections < 0)
		/* kmalloc failed, drop it entirely */
		goto hotdrop;

	return (connections > info->limit) ^
	       !!(info->flags & XT_CONNLIMIT_INVERT);

 hotdrop:
	par->hotdrop = true;
	return false;
}

static int connlimit_mt_check(const struct xt_mtchk_param *par)
{
	struct xt_connlimit_info *info = par->matchinfo;
	unsigned int i;
	int ret;

	if (unlikely(!connlimit_rnd)) {
		u_int32_t rand;

		do {
			get_random_bytes(&rand, sizeof(rand));
		} while (!rand);
		cmpxchg(&connlimit_rnd, 0, rand);
	}
	ret = nf_ct_l3proto_try_module_get(par->family);
	if (ret < 0) {
		pr_info("cannot load conntrack support for "
			"address family %u\n", par->family);
		return ret;
	}

	/* init private data */
	info->data = kmalloc(sizeof(struct xt_connlimit_data), GFP_KERNEL);
	if (info->data == NULL) {
		nf_ct_l3proto_module_put(par->family);
		return -ENOMEM;
	}

	spin_lock_init(&info->data->lock);
	for (i = 0; i < ARRAY_SIZE(info->data->iphash); ++i)
		INIT_HLIST_HEAD(&info->data->iphash[i]);

	return 0;
}

static void connlimit_mt_destroy(const struct xt_mtdtor_param *par)
{
	const struct xt_connlimit_info *info = par->matchinfo;
	struct xt_connlimit_conn *conn;
	struct hlist_node *n;
	struct hlist_head *hash = info->data->iphash;
	unsigned int i;

	nf_ct_l3proto_module_put(par->family);

	for (i = 0; i < ARRAY_SIZE(info->data->iphash); ++i) {
		hlist_for_each_entry_safe(conn, n, &hash[i], node) {
			hlist_del(&conn->node);
			kfree(conn);
		}
	}

	kfree(info->data);
}

static struct xt_match connlimit_mt_reg __read_mostly = {
	.name       = "connlimit",
	.revision   = 1,
	.family     = NFPROTO_UNSPEC,
	.checkentry = connlimit_mt_check,
	.match      = connlimit_mt,
	.matchsize  = sizeof(struct xt_connlimit_info),
	.destroy    = connlimit_mt_destroy,
	.me         = THIS_MODULE,
};

static int __init connlimit_mt_init(void)
{
	return xt_register_match(&connlimit_mt_reg);
}

static void __exit connlimit_mt_exit(void)
{
	xt_unregister_match(&connlimit_mt_reg);
}

module_init(connlimit_mt_init);
module_exit(connlimit_mt_exit);
MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>");
MODULE_DESCRIPTION("Xtables: Number of connections matching");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_connlimit");
MODULE_ALIAS("ip6t_connlimit");
Commit	Line	Data
370786f9 JE	1	/*
	2	* netfilter module to limit the number of parallel tcp
	3	* connections per IP address.
	4	* (c) 2000 Gerd Knorr <kraxel@bytesex.org>
	5	* Nov 2002: Martin Bene <martin.bene@icomedias.com>:
	6	* only ignore TIME_WAIT or gone connections
ba5dc275	7	* (C) CC Computer Consultants GmbH, 2007
370786f9 JE	8	*
	9	* based on ...
	10	*
	11	* Kernel module to match connection tracking information.
	12	* GPL (C) 1999 Rusty Russell (rusty@rustcorp.com.au).
	13	*/
8bee4bad	14	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
370786f9 JE	15	#include <linux/in.h>
	16	#include <linux/in6.h>
	17	#include <linux/ip.h>
	18	#include <linux/ipv6.h>
	19	#include <linux/jhash.h>
5a0e3ad6	20	#include <linux/slab.h>
370786f9 JE	21	#include <linux/list.h>
	22	#include <linux/module.h>
	23	#include <linux/random.h>
	24	#include <linux/skbuff.h>
	25	#include <linux/spinlock.h>
	26	#include <linux/netfilter/nf_conntrack_tcp.h>
	27	#include <linux/netfilter/x_tables.h>
	28	#include <linux/netfilter/xt_connlimit.h>
	29	#include <net/netfilter/nf_conntrack.h>
	30	#include <net/netfilter/nf_conntrack_core.h>
	31	#include <net/netfilter/nf_conntrack_tuple.h>
5d0aa2cc	32	#include <net/netfilter/nf_conntrack_zones.h>
370786f9 JE	33
	34	/* we will save the tuples of all connections we care about */
	35	struct xt_connlimit_conn {
3e0d5149	36	struct hlist_node node;
8183e3a8 CG	37	struct nf_conntrack_tuple tuple;
8183e3a8 CG	38	union nf_inet_addr addr;
370786f9 JE	39	};
	40
	41	struct xt_connlimit_data {
3e0d5149 CG	42	struct hlist_head iphash[256];
3e0d5149 CG	43	spinlock_t lock;
370786f9 JE	44	};
370786f9 JE	45
294188ae	46	static u_int32_t connlimit_rnd __read_mostly;
370786f9	47
a34c4589	48	static inline unsigned int connlimit_iphash(__be32 addr)
370786f9	49	{
a34c4589	50	return jhash_1word((__force __u32)addr, connlimit_rnd) & 0xFF;
370786f9 JE	51	}
	52
	53	static inline unsigned int
643a2c15 JE	54	connlimit_iphash6(const union nf_inet_addr *addr,
643a2c15 JE	55	const union nf_inet_addr *mask)
370786f9	56	{
643a2c15	57	union nf_inet_addr res;
370786f9 JE	58	unsigned int i;
370786f9 JE	59
370786f9 JE	60	for (i = 0; i < ARRAY_SIZE(addr->ip6); ++i)
	61	res.ip6[i] = addr->ip6[i] & mask->ip6[i];
	62
a34c4589	63	return jhash2((u32 *)res.ip6, ARRAY_SIZE(res.ip6), connlimit_rnd) & 0xFF;
370786f9 JE	64	}
	65
	66	static inline bool already_closed(const struct nf_conn *conn)
	67	{
5e8fbe2a	68	if (nf_ct_protonum(conn) == IPPROTO_TCP)
d2ee3f2c DW	69	return conn->proto.tcp.state == TCP_CONNTRACK_TIME_WAIT \|\|
d2ee3f2c DW	70	conn->proto.tcp.state == TCP_CONNTRACK_CLOSE;
370786f9 JE	71	else
	72	return 0;
	73	}
	74
	75	static inline unsigned int
643a2c15 JE	76	same_source_net(const union nf_inet_addr *addr,
643a2c15 JE	77	const union nf_inet_addr *mask,
76108cea	78	const union nf_inet_addr *u3, u_int8_t family)
370786f9	79	{
ee999d8b	80	if (family == NFPROTO_IPV4) {
370786f9 JE	81	return (addr->ip & mask->ip) == (u3->ip & mask->ip);
370786f9 JE	82	} else {
643a2c15	83	union nf_inet_addr lh, rh;
370786f9 JE	84	unsigned int i;
	85
	86	for (i = 0; i < ARRAY_SIZE(addr->ip6); ++i) {
	87	lh.ip6[i] = addr->ip6[i] & mask->ip6[i];
	88	rh.ip6[i] = u3->ip6[i] & mask->ip6[i];
	89	}
	90
	91	return memcmp(&lh.ip6, &rh.ip6, sizeof(lh.ip6)) == 0;
	92	}
	93	}
	94
15cfd528 FW	95	static int count_hlist(struct net *net,
	96	struct hlist_head *head,
	97	const struct nf_conntrack_tuple *tuple,
	98	const union nf_inet_addr *addr,
	99	const union nf_inet_addr *mask,
	100	u_int8_t family)
370786f9	101	{
3cf93c96	102	const struct nf_conntrack_tuple_hash *found;
370786f9	103	struct xt_connlimit_conn *conn;
b67bfe0d	104	struct hlist_node *n;
ea781f19	105	struct nf_conn *found_ct;
370786f9 JE	106	bool addit = true;
	107	int matches = 0;
	108
76507f69	109	rcu_read_lock();
370786f9 JE	110
370786f9 JE	111	/* check the saved connections */
15cfd528	112	hlist_for_each_entry_safe(conn, n, head, node) {
5d0aa2cc PM	113	found = nf_conntrack_find_get(net, NF_CT_DEFAULT_ZONE,
5d0aa2cc PM	114	&conn->tuple);
370786f9 JE	115	found_ct = NULL;
	116
	117	if (found != NULL)
	118	found_ct = nf_ct_tuplehash_to_ctrack(found);
	119
	120	if (found_ct != NULL &&
	121	nf_ct_tuple_equal(&conn->tuple, tuple) &&
	122	!already_closed(found_ct))
	123	/*
	124	* Just to be sure we have it only once in the list.
	125	* We should not see tuples twice unless someone hooks
	126	* this into a table without "-p tcp --syn".
	127	*/
	128	addit = false;
	129
	130	if (found == NULL) {
	131	/* this one is gone */
3e0d5149	132	hlist_del(&conn->node);
370786f9 JE	133	kfree(conn);
	134	continue;
	135	}
	136
	137	if (already_closed(found_ct)) {
	138	/*
	139	* we do not care about connections which are
	140	* closed already -> ditch it
	141	*/
ea781f19	142	nf_ct_put(found_ct);
3e0d5149	143	hlist_del(&conn->node);
370786f9 JE	144	kfree(conn);
	145	continue;
	146	}
	147
8183e3a8	148	if (same_source_net(addr, mask, &conn->addr, family))
370786f9 JE	149	/* same source network -> be counted! */
370786f9 JE	150	++matches;
ea781f19	151	nf_ct_put(found_ct);
370786f9 JE	152	}
370786f9 JE	153
76507f69	154	rcu_read_unlock();
370786f9 JE	155
	156	if (addit) {
	157	/* save the new connection in our list */
0e23ca14	158	conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
370786f9 JE	159	if (conn == NULL)
	160	return -ENOMEM;
	161	conn->tuple = *tuple;
8183e3a8	162	conn->addr = *addr;
15cfd528	163	hlist_add_head(&conn->node, head);
370786f9 JE	164	++matches;
	165	}
	166
	167	return matches;
	168	}
	169
15cfd528 FW	170	static int count_them(struct net *net,
	171	struct xt_connlimit_data *data,
	172	const struct nf_conntrack_tuple *tuple,
	173	const union nf_inet_addr *addr,
	174	const union nf_inet_addr *mask,
	175	u_int8_t family)
	176	{
	177	struct hlist_head *hhead;
	178	int count;
	179	u32 hash;
	180
	181	if (family == NFPROTO_IPV6)
	182	hash = connlimit_iphash6(addr, mask);
	183	else
	184	hash = connlimit_iphash(addr->ip & mask->ip);
	185
	186	hhead = &data->iphash[hash];
	187
	188	spin_lock_bh(&data->lock);
	189	count = count_hlist(net, hhead, tuple, addr, mask, family);
	190	spin_unlock_bh(&data->lock);
	191
	192	return count;
	193	}
	194
d3c5ee6d	195	static bool
62fc8051	196	connlimit_mt(const struct sk_buff skb, struct xt_action_param par)
370786f9	197	{
83fc8102	198	struct net *net = dev_net(par->in ? par->in : par->out);
f7108a20	199	const struct xt_connlimit_info *info = par->matchinfo;
22c2d8bc	200	union nf_inet_addr addr;
370786f9 JE	201	struct nf_conntrack_tuple tuple;
	202	const struct nf_conntrack_tuple *tuple_ptr = &tuple;
	203	enum ip_conntrack_info ctinfo;
	204	const struct nf_conn *ct;
	205	int connections;
	206
	207	ct = nf_ct_get(skb, &ctinfo);
8183e3a8 CG	208	if (ct != NULL)
	209	tuple_ptr = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
	210	else if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb),
	211	par->family, &tuple))
370786f9 JE	212	goto hotdrop;
370786f9 JE	213
92f3b2b1	214	if (par->family == NFPROTO_IPV6) {
370786f9	215	const struct ipv6hdr *iph = ipv6_hdr(skb);
cc4fc022 JE	216	memcpy(&addr.ip6, (info->flags & XT_CONNLIMIT_DADDR) ?
cc4fc022 JE	217	&iph->daddr : &iph->saddr, sizeof(addr.ip6));
370786f9 JE	218	} else {
370786f9 JE	219	const struct iphdr *iph = ip_hdr(skb);
cc4fc022 JE	220	addr.ip = (info->flags & XT_CONNLIMIT_DADDR) ?
cc4fc022 JE	221	iph->daddr : iph->saddr;
370786f9 JE	222	}
370786f9 JE	223
83fc8102	224	connections = count_them(net, info->data, tuple_ptr, &addr,
20b7975e	225	&info->mask, par->family);
370786f9	226
1cc34c30	227	if (connections < 0)
370786f9	228	/* kmalloc failed, drop it entirely */
1cc34c30	229	goto hotdrop;
370786f9	230
cc4fc022 JE	231	return (connections > info->limit) ^
cc4fc022 JE	232	!!(info->flags & XT_CONNLIMIT_INVERT);
370786f9 JE	233
370786f9 JE	234	hotdrop:
b4ba2611	235	par->hotdrop = true;
370786f9 JE	236	return false;
	237	}
	238
b0f38452	239	static int connlimit_mt_check(const struct xt_mtchk_param *par)
370786f9	240	{
9b4fce7a	241	struct xt_connlimit_info *info = par->matchinfo;
370786f9	242	unsigned int i;
4a5a5c73	243	int ret;
370786f9	244
4656c4d6 CG	245	if (unlikely(!connlimit_rnd)) {
	246	u_int32_t rand;
	247
	248	do {
	249	get_random_bytes(&rand, sizeof(rand));
	250	} while (!rand);
	251	cmpxchg(&connlimit_rnd, 0, rand);
294188ae	252	}
4a5a5c73 JE	253	ret = nf_ct_l3proto_try_module_get(par->family);
4a5a5c73 JE	254	if (ret < 0) {
8bee4bad JE	255	pr_info("cannot load conntrack support for "
8bee4bad JE	256	"address family %u\n", par->family);
4a5a5c73	257	return ret;
370786f9 JE	258	}
	259
	260	/* init private data */
	261	info->data = kmalloc(sizeof(struct xt_connlimit_data), GFP_KERNEL);
	262	if (info->data == NULL) {
92f3b2b1	263	nf_ct_l3proto_module_put(par->family);
4a5a5c73	264	return -ENOMEM;
370786f9 JE	265	}
	266
	267	spin_lock_init(&info->data->lock);
	268	for (i = 0; i < ARRAY_SIZE(info->data->iphash); ++i)
3e0d5149	269	INIT_HLIST_HEAD(&info->data->iphash[i]);
370786f9	270
bd414ee6	271	return 0;
370786f9 JE	272	}
370786f9 JE	273
6be3d859	274	static void connlimit_mt_destroy(const struct xt_mtdtor_param *par)
370786f9	275	{
6be3d859	276	const struct xt_connlimit_info *info = par->matchinfo;
370786f9	277	struct xt_connlimit_conn *conn;
b67bfe0d	278	struct hlist_node *n;
3e0d5149	279	struct hlist_head *hash = info->data->iphash;
370786f9 JE	280	unsigned int i;
370786f9 JE	281
92f3b2b1	282	nf_ct_l3proto_module_put(par->family);
370786f9 JE	283
370786f9 JE	284	for (i = 0; i < ARRAY_SIZE(info->data->iphash); ++i) {
b67bfe0d	285	hlist_for_each_entry_safe(conn, n, &hash[i], node) {
3e0d5149	286	hlist_del(&conn->node);
370786f9 JE	287	kfree(conn);
	288	}
	289	}
	290
	291	kfree(info->data);
	292	}
	293
68c07cb6 CW	294	static struct xt_match connlimit_mt_reg __read_mostly = {
	295	.name = "connlimit",
	296	.revision = 1,
	297	.family = NFPROTO_UNSPEC,
	298	.checkentry = connlimit_mt_check,
	299	.match = connlimit_mt,
	300	.matchsize = sizeof(struct xt_connlimit_info),
	301	.destroy = connlimit_mt_destroy,
	302	.me = THIS_MODULE,
370786f9 JE	303	};
370786f9 JE	304
d3c5ee6d	305	static int __init connlimit_mt_init(void)
370786f9	306	{
68c07cb6	307	return xt_register_match(&connlimit_mt_reg);
370786f9 JE	308	}
370786f9 JE	309
d3c5ee6d	310	static void __exit connlimit_mt_exit(void)
370786f9	311	{
68c07cb6	312	xt_unregister_match(&connlimit_mt_reg);
370786f9 JE	313	}
370786f9 JE	314
d3c5ee6d JE	315	module_init(connlimit_mt_init);
d3c5ee6d JE	316	module_exit(connlimit_mt_exit);
92f3b2b1	317	MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>");
2ae15b64	318	MODULE_DESCRIPTION("Xtables: Number of connections matching");
370786f9 JE	319	MODULE_LICENSE("GPL");
	320	MODULE_ALIAS("ipt_connlimit");
	321	MODULE_ALIAS("ip6t_connlimit");