[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, bool *addit)
{
	const struct nf_conntrack_tuple_hash *found;
	struct xt_connlimit_conn *conn;
	struct hlist_node *n;
	struct nf_conn *found_ct;
	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);
		if (found == NULL) {
			hlist_del(&conn->node);
			kfree(conn);
			continue;
		}

		found_ct = nf_ct_tuplehash_to_ctrack(found);

		if (nf_ct_tuple_equal(&conn->tuple, tuple)) {
			/*
			 * 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;
		} else 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();

	return matches;
}

static bool add_hlist(struct hlist_head *head,
		      const struct nf_conntrack_tuple *tuple,
		      const union nf_inet_addr *addr)
{
	struct xt_connlimit_conn *conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
	if (conn == NULL)
		return false;
	conn->tuple = *tuple;
	conn->addr = *addr;
	hlist_add_head(&conn->node, head);
	return true;
}

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;
	bool addit = true;

	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, &addit);
	if (addit) {
		if (add_hlist(hhead, tuple, addr))
			count++;
		else
			count = -ENOMEM;
	}
	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,
3bcc5fdf	100	u_int8_t family, bool *addit)
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	int matches = 0;
370786f9 JE	107
76507f69	108	rcu_read_lock();
370786f9 JE	109
370786f9 JE	110	/* check the saved connections */
15cfd528	111	hlist_for_each_entry_safe(conn, n, head, node) {
5d0aa2cc PM	112	found = nf_conntrack_find_get(net, NF_CT_DEFAULT_ZONE,
5d0aa2cc PM	113	&conn->tuple);
d9ec4f1e FW	114	if (found == NULL) {
	115	hlist_del(&conn->node);
	116	kfree(conn);
	117	continue;
	118	}
370786f9	119
d9ec4f1e	120	found_ct = nf_ct_tuplehash_to_ctrack(found);
370786f9	121
d9ec4f1e	122	if (nf_ct_tuple_equal(&conn->tuple, tuple)) {
370786f9 JE	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	*/
3bcc5fdf	128	*addit = false;
d9ec4f1e	129	} else if (already_closed(found_ct)) {
370786f9 JE	130	/*
	131	* we do not care about connections which are
	132	* closed already -> ditch it
	133	*/
ea781f19	134	nf_ct_put(found_ct);
3e0d5149	135	hlist_del(&conn->node);
370786f9 JE	136	kfree(conn);
	137	continue;
	138	}
	139
8183e3a8	140	if (same_source_net(addr, mask, &conn->addr, family))
370786f9 JE	141	/* same source network -> be counted! */
370786f9 JE	142	++matches;
ea781f19	143	nf_ct_put(found_ct);
370786f9 JE	144	}
370786f9 JE	145
76507f69	146	rcu_read_unlock();
370786f9	147
370786f9 JE	148	return matches;
	149	}
	150
3bcc5fdf FW	151	static bool add_hlist(struct hlist_head *head,
	152	const struct nf_conntrack_tuple *tuple,
	153	const union nf_inet_addr *addr)
	154	{
	155	struct xt_connlimit_conn conn = kmalloc(sizeof(conn), GFP_ATOMIC);
	156	if (conn == NULL)
	157	return false;
	158	conn->tuple = *tuple;
	159	conn->addr = *addr;
	160	hlist_add_head(&conn->node, head);
	161	return true;
	162	}
	163
15cfd528 FW	164	static int count_them(struct net *net,
	165	struct xt_connlimit_data *data,
	166	const struct nf_conntrack_tuple *tuple,
	167	const union nf_inet_addr *addr,
	168	const union nf_inet_addr *mask,
	169	u_int8_t family)
	170	{
	171	struct hlist_head *hhead;
	172	int count;
	173	u32 hash;
3bcc5fdf	174	bool addit = true;
15cfd528 FW	175
	176	if (family == NFPROTO_IPV6)
	177	hash = connlimit_iphash6(addr, mask);
	178	else
	179	hash = connlimit_iphash(addr->ip & mask->ip);
	180
	181	hhead = &data->iphash[hash];
	182
	183	spin_lock_bh(&data->lock);
3bcc5fdf FW	184	count = count_hlist(net, hhead, tuple, addr, mask, family, &addit);
	185	if (addit) {
	186	if (add_hlist(hhead, tuple, addr))
	187	count++;
	188	else
	189	count = -ENOMEM;
	190	}
15cfd528 FW	191	spin_unlock_bh(&data->lock);
	192
	193	return count;
	194	}
	195
d3c5ee6d	196	static bool
62fc8051	197	connlimit_mt(const struct sk_buff skb, struct xt_action_param par)
370786f9	198	{
83fc8102	199	struct net *net = dev_net(par->in ? par->in : par->out);
f7108a20	200	const struct xt_connlimit_info *info = par->matchinfo;
22c2d8bc	201	union nf_inet_addr addr;
370786f9 JE	202	struct nf_conntrack_tuple tuple;
	203	const struct nf_conntrack_tuple *tuple_ptr = &tuple;
	204	enum ip_conntrack_info ctinfo;
	205	const struct nf_conn *ct;
	206	int connections;
	207
	208	ct = nf_ct_get(skb, &ctinfo);
8183e3a8 CG	209	if (ct != NULL)
	210	tuple_ptr = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
	211	else if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb),
	212	par->family, &tuple))
370786f9 JE	213	goto hotdrop;
370786f9 JE	214
92f3b2b1	215	if (par->family == NFPROTO_IPV6) {
370786f9	216	const struct ipv6hdr *iph = ipv6_hdr(skb);
cc4fc022 JE	217	memcpy(&addr.ip6, (info->flags & XT_CONNLIMIT_DADDR) ?
cc4fc022 JE	218	&iph->daddr : &iph->saddr, sizeof(addr.ip6));
370786f9 JE	219	} else {
370786f9 JE	220	const struct iphdr *iph = ip_hdr(skb);
cc4fc022 JE	221	addr.ip = (info->flags & XT_CONNLIMIT_DADDR) ?
cc4fc022 JE	222	iph->daddr : iph->saddr;
370786f9 JE	223	}
370786f9 JE	224
83fc8102	225	connections = count_them(net, info->data, tuple_ptr, &addr,
20b7975e	226	&info->mask, par->family);
370786f9	227
1cc34c30	228	if (connections < 0)
370786f9	229	/* kmalloc failed, drop it entirely */
1cc34c30	230	goto hotdrop;
370786f9	231
cc4fc022 JE	232	return (connections > info->limit) ^
cc4fc022 JE	233	!!(info->flags & XT_CONNLIMIT_INVERT);
370786f9 JE	234
370786f9 JE	235	hotdrop:
b4ba2611	236	par->hotdrop = true;
370786f9 JE	237	return false;
	238	}
	239
b0f38452	240	static int connlimit_mt_check(const struct xt_mtchk_param *par)
370786f9	241	{
9b4fce7a	242	struct xt_connlimit_info *info = par->matchinfo;
370786f9	243	unsigned int i;
4a5a5c73	244	int ret;
370786f9	245
4656c4d6 CG	246	if (unlikely(!connlimit_rnd)) {
	247	u_int32_t rand;
	248
	249	do {
	250	get_random_bytes(&rand, sizeof(rand));
	251	} while (!rand);
	252	cmpxchg(&connlimit_rnd, 0, rand);
294188ae	253	}
4a5a5c73 JE	254	ret = nf_ct_l3proto_try_module_get(par->family);
4a5a5c73 JE	255	if (ret < 0) {
8bee4bad JE	256	pr_info("cannot load conntrack support for "
8bee4bad JE	257	"address family %u\n", par->family);
4a5a5c73	258	return ret;
370786f9 JE	259	}
	260
	261	/* init private data */
	262	info->data = kmalloc(sizeof(struct xt_connlimit_data), GFP_KERNEL);
	263	if (info->data == NULL) {
92f3b2b1	264	nf_ct_l3proto_module_put(par->family);
4a5a5c73	265	return -ENOMEM;
370786f9 JE	266	}
	267
	268	spin_lock_init(&info->data->lock);
	269	for (i = 0; i < ARRAY_SIZE(info->data->iphash); ++i)
3e0d5149	270	INIT_HLIST_HEAD(&info->data->iphash[i]);
370786f9	271
bd414ee6	272	return 0;
370786f9 JE	273	}
370786f9 JE	274
6be3d859	275	static void connlimit_mt_destroy(const struct xt_mtdtor_param *par)
370786f9	276	{
6be3d859	277	const struct xt_connlimit_info *info = par->matchinfo;
370786f9	278	struct xt_connlimit_conn *conn;
b67bfe0d	279	struct hlist_node *n;
3e0d5149	280	struct hlist_head *hash = info->data->iphash;
370786f9 JE	281	unsigned int i;
370786f9 JE	282
92f3b2b1	283	nf_ct_l3proto_module_put(par->family);
370786f9 JE	284
370786f9 JE	285	for (i = 0; i < ARRAY_SIZE(info->data->iphash); ++i) {
b67bfe0d	286	hlist_for_each_entry_safe(conn, n, &hash[i], node) {
3e0d5149	287	hlist_del(&conn->node);
370786f9 JE	288	kfree(conn);
	289	}
	290	}
	291
	292	kfree(info->data);
	293	}
	294
68c07cb6 CW	295	static struct xt_match connlimit_mt_reg __read_mostly = {
	296	.name = "connlimit",
	297	.revision = 1,
	298	.family = NFPROTO_UNSPEC,
	299	.checkentry = connlimit_mt_check,
	300	.match = connlimit_mt,
	301	.matchsize = sizeof(struct xt_connlimit_info),
	302	.destroy = connlimit_mt_destroy,
	303	.me = THIS_MODULE,
370786f9 JE	304	};
370786f9 JE	305
d3c5ee6d	306	static int __init connlimit_mt_init(void)
370786f9	307	{
68c07cb6	308	return xt_register_match(&connlimit_mt_reg);
370786f9 JE	309	}
370786f9 JE	310
d3c5ee6d	311	static void __exit connlimit_mt_exit(void)
370786f9	312	{
68c07cb6	313	xt_unregister_match(&connlimit_mt_reg);
370786f9 JE	314	}
370786f9 JE	315
d3c5ee6d JE	316	module_init(connlimit_mt_init);
d3c5ee6d JE	317	module_exit(connlimit_mt_exit);
92f3b2b1	318	MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>");
2ae15b64	319	MODULE_DESCRIPTION("Xtables: Number of connections matching");
370786f9 JE	320	MODULE_LICENSE("GPL");
	321	MODULE_ALIAS("ipt_connlimit");
	322	MODULE_ALIAS("ip6t_connlimit");