[net-next-2.6.git] / net / netfilter / nfnetlink.c

/* Netfilter messages via netlink socket. Allows for user space
 * protocol helpers and general trouble making from userspace.
 *
 * (C) 2001 by Jay Schulist <jschlst@samba.org>,
 * (C) 2002-2005 by Harald Welte <laforge@gnumonks.org>
 * (C) 2005 by Pablo Neira Ayuso <pablo@eurodev.net>
 *
 * Initial netfilter messages via netlink development funded and
 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
 *
 * Further development of this code funded by Astaro AG (http://www.astaro.com)
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/fcntl.h>
#include <linux/skbuff.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <net/sock.h>
#include <linux/init.h>
#include <linux/spinlock.h>

#include <linux/netfilter.h>
#include <linux/netlink.h>
#include <linux/netfilter/nfnetlink.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_NETFILTER);

static char __initdata nfversion[] = "0.30";

#if 0
#define DEBUGP(format, args...)	\
		printk(KERN_DEBUG "%s(%d):%s(): " format, __FILE__, \
			__LINE__, __FUNCTION__, ## args)
#else
#define DEBUGP(format, args...)
#endif

static struct sock *nfnl = NULL;
static struct nfnetlink_subsystem *subsys_table[NFNL_SUBSYS_COUNT];
DECLARE_MUTEX(nfnl_sem);

void nfnl_lock(void)
{
	nfnl_shlock();
}

void nfnl_unlock(void)
{
	nfnl_shunlock();
}

int nfnetlink_subsys_register(struct nfnetlink_subsystem *n)
{
	DEBUGP("registering subsystem ID %u\n", n->subsys_id);

	nfnl_lock();
	if (subsys_table[n->subsys_id]) {
		nfnl_unlock();
		return -EBUSY;
	}
	subsys_table[n->subsys_id] = n;
	nfnl_unlock();

	return 0;
}

int nfnetlink_subsys_unregister(struct nfnetlink_subsystem *n)
{
	DEBUGP("unregistering subsystem ID %u\n", n->subsys_id);

	nfnl_lock();
	subsys_table[n->subsys_id] = NULL;
	nfnl_unlock();

	return 0;
}

static inline struct nfnetlink_subsystem *nfnetlink_get_subsys(u_int16_t type)
{
	u_int8_t subsys_id = NFNL_SUBSYS_ID(type);

	if (subsys_id >= NFNL_SUBSYS_COUNT
	    || subsys_table[subsys_id] == NULL)
		return NULL;

	return subsys_table[subsys_id];
}

static inline struct nfnl_callback *
nfnetlink_find_client(u_int16_t type, struct nfnetlink_subsystem *ss)
{
	u_int8_t cb_id = NFNL_MSG_TYPE(type);
	
	if (cb_id >= ss->cb_count) {
		DEBUGP("msgtype %u >= %u, returning\n", type, ss->cb_count);
		return NULL;
	}

	return &ss->cb[cb_id];
}

void __nfa_fill(struct sk_buff *skb, int attrtype, int attrlen,
		const void *data)
{
	struct nfattr *nfa;
	int size = NFA_LENGTH(attrlen);

	nfa = (struct nfattr *)skb_put(skb, NFA_ALIGN(size));
	nfa->nfa_type = attrtype;
	nfa->nfa_len  = size;
	memcpy(NFA_DATA(nfa), data, attrlen);
	memset(NFA_DATA(nfa) + attrlen, 0, NFA_ALIGN(size) - size);
}

int nfattr_parse(struct nfattr *tb[], int maxattr, struct nfattr *nfa, int len)
{
	memset(tb, 0, sizeof(struct nfattr *) * maxattr);

	while (NFA_OK(nfa, len)) {
		unsigned flavor = nfa->nfa_type;
		if (flavor && flavor <= maxattr)
			tb[flavor-1] = nfa;
		nfa = NFA_NEXT(nfa, len);
	}

	return 0;
}

/**
 * nfnetlink_check_attributes - check and parse nfnetlink attributes
 *
 * subsys: nfnl subsystem for which this message is to be parsed
 * nlmsghdr: netlink message to be checked/parsed
 * cda: array of pointers, needs to be at least subsys->attr_count big
 *
 */
static int
nfnetlink_check_attributes(struct nfnetlink_subsystem *subsys,
			   struct nlmsghdr *nlh, struct nfattr *cda[])
{
	int min_len;

	memset(cda, 0, sizeof(struct nfattr *) * subsys->attr_count);

	/* check attribute lengths. */
	min_len = NLMSG_ALIGN(sizeof(struct nfgenmsg));
	if (nlh->nlmsg_len < min_len)
		return -EINVAL;

	if (nlh->nlmsg_len > min_len) {
		struct nfattr *attr = NFM_NFA(NLMSG_DATA(nlh));
		int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);

		while (NFA_OK(attr, attrlen)) {
			unsigned flavor = attr->nfa_type;
			if (flavor) {
				if (flavor > subsys->attr_count)
					return -EINVAL;
				cda[flavor - 1] = attr;
			}
			attr = NFA_NEXT(attr, attrlen);
		}
	} else
		return -EINVAL;

        return 0;
}

int nfnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
{
	int allocation = in_interrupt() ? GFP_ATOMIC : GFP_KERNEL;
	int err = 0;

	NETLINK_CB(skb).dst_groups = group;
	if (echo)
		atomic_inc(&skb->users);
	netlink_broadcast(nfnl, skb, pid, group, allocation);
	if (echo)
		err = netlink_unicast(nfnl, skb, pid, MSG_DONTWAIT);

	return err;
}

int nfnetlink_unicast(struct sk_buff *skb, u_int32_t pid, int flags)
{
	return netlink_unicast(nfnl, skb, pid, flags);
}

/* Process one complete nfnetlink message. */
static inline int nfnetlink_rcv_msg(struct sk_buff *skb,
				    struct nlmsghdr *nlh, int *errp)
{
	struct nfnl_callback *nc;
	struct nfnetlink_subsystem *ss;
	int type, err = 0;

	DEBUGP("entered; subsys=%u, msgtype=%u\n",
		 NFNL_SUBSYS_ID(nlh->nlmsg_type),
		 NFNL_MSG_TYPE(nlh->nlmsg_type));

	/* Only requests are handled by kernel now. */
	if (!(nlh->nlmsg_flags & NLM_F_REQUEST)) {
		DEBUGP("received non-request message\n");
		return 0;
	}

	/* All the messages must at least contain nfgenmsg */
	if (nlh->nlmsg_len < 
			NLMSG_LENGTH(NLMSG_ALIGN(sizeof(struct nfgenmsg)))) {
		DEBUGP("received message was too short\n");
		return 0;
	}

	type = nlh->nlmsg_type;
	ss = nfnetlink_get_subsys(type);
	if (!ss) {
#ifdef CONFIG_KMOD
		/* don't call nfnl_shunlock, since it would reenter
		 * with further packet processing */
		up(&nfnl_sem);
		request_module("nfnetlink-subsys-%d", NFNL_SUBSYS_ID(type));
		nfnl_shlock();
		ss = nfnetlink_get_subsys(type);
		if (!ss)
#endif
		goto err_inval;
	}

	nc = nfnetlink_find_client(type, ss);
	if (!nc) {
		DEBUGP("unable to find client for type %d\n", type);
		goto err_inval;
	}

	if (nc->cap_required && 
	    !cap_raised(NETLINK_CB(skb).eff_cap, nc->cap_required)) {
		DEBUGP("permission denied for type %d\n", type);
		*errp = -EPERM;
		return -1;
	}

	{
		struct nfattr *cda[ss->attr_count];

		memset(cda, 0, ss->attr_count*sizeof(struct nfattr *));
		
		err = nfnetlink_check_attributes(ss, nlh, cda);
		if (err < 0)
			goto err_inval;

		DEBUGP("calling handler\n");
		err = nc->call(nfnl, skb, nlh, cda, errp);
		*errp = err;
		return err;
	}

err_inval:
	DEBUGP("returning -EINVAL\n");
	*errp = -EINVAL;
	return -1;
}

/* Process one packet of messages. */
static inline int nfnetlink_rcv_skb(struct sk_buff *skb)
{
	int err;
	struct nlmsghdr *nlh;

	while (skb->len >= NLMSG_SPACE(0)) {
		u32 rlen;

		nlh = (struct nlmsghdr *)skb->data;
		if (nlh->nlmsg_len < sizeof(struct nlmsghdr)
		    || skb->len < nlh->nlmsg_len)
			return 0;
		rlen = NLMSG_ALIGN(nlh->nlmsg_len);
		if (rlen > skb->len)
			rlen = skb->len;
		if (nfnetlink_rcv_msg(skb, nlh, &err)) {
			if (!err)
				return -1;
			netlink_ack(skb, nlh, err);
		} else
			if (nlh->nlmsg_flags & NLM_F_ACK)
				netlink_ack(skb, nlh, 0);
		skb_pull(skb, rlen);
	}

	return 0;
}

static void nfnetlink_rcv(struct sock *sk, int len)
{
	do {
		struct sk_buff *skb;

		if (nfnl_shlock_nowait())
			return;

		while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
			if (nfnetlink_rcv_skb(skb)) {
				if (skb->len)
					skb_queue_head(&sk->sk_receive_queue,
						       skb);
				else
					kfree_skb(skb);
				break;
			}
			kfree_skb(skb);
		}

		/* don't call nfnl_shunlock, since it would reenter
		 * with further packet processing */
		up(&nfnl_sem);
	} while(nfnl && nfnl->sk_receive_queue.qlen);
}

void __exit nfnetlink_exit(void)
{
	printk("Removing netfilter NETLINK layer.\n");
	sock_release(nfnl->sk_socket);
	return;
}

int __init nfnetlink_init(void)
{
	printk("Netfilter messages via NETLINK v%s.\n", nfversion);

	nfnl = netlink_kernel_create(NETLINK_NETFILTER, nfnetlink_rcv,
				     THIS_MODULE);
	if (!nfnl) {
		printk(KERN_ERR "cannot initialize nfnetlink!\n");
		return -1;
	}

	return 0;
}

module_init(nfnetlink_init);
module_exit(nfnetlink_exit);

EXPORT_SYMBOL_GPL(nfnetlink_subsys_register);
EXPORT_SYMBOL_GPL(nfnetlink_subsys_unregister);
EXPORT_SYMBOL_GPL(nfnetlink_send);
EXPORT_SYMBOL_GPL(nfnetlink_unicast);
EXPORT_SYMBOL_GPL(nfattr_parse);
EXPORT_SYMBOL_GPL(__nfa_fill);
Commit	Line	Data
f9e815b3 HW	1	/* Netfilter messages via netlink socket. Allows for user space
	2	* protocol helpers and general trouble making from userspace.
	3	*
	4	* (C) 2001 by Jay Schulist <jschlst@samba.org>,
	5	* (C) 2002-2005 by Harald Welte <laforge@gnumonks.org>
	6	* (C) 2005 by Pablo Neira Ayuso <pablo@eurodev.net>
	7	*
	8	* Initial netfilter messages via netlink development funded and
	9	* generally made possible by Network Robots, Inc. (www.networkrobots.com)
	10	*
	11	* Further development of this code funded by Astaro AG (http://www.astaro.com)
	12	*
	13	* This software may be used and distributed according to the terms
	14	* of the GNU General Public License, incorporated herein by reference.
	15	*/
	16
	17	#include <linux/config.h>
	18	#include <linux/module.h>
	19	#include <linux/types.h>
	20	#include <linux/socket.h>
	21	#include <linux/kernel.h>
	22	#include <linux/major.h>
	23	#include <linux/sched.h>
	24	#include <linux/timer.h>
	25	#include <linux/string.h>
	26	#include <linux/sockios.h>
	27	#include <linux/net.h>
	28	#include <linux/fcntl.h>
	29	#include <linux/skbuff.h>
	30	#include <asm/uaccess.h>
	31	#include <asm/system.h>
	32	#include <net/sock.h>
	33	#include <linux/init.h>
	34	#include <linux/spinlock.h>
	35
	36	#include <linux/netfilter.h>
	37	#include <linux/netlink.h>
	38	#include <linux/netfilter/nfnetlink.h>
	39
	40	MODULE_LICENSE("GPL");
4fdb3bb7 HW	41	MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
4fdb3bb7 HW	42	MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_NETFILTER);
f9e815b3 HW	43
	44	static char __initdata nfversion[] = "0.30";
	45
	46	#if 0
0ab43f84 HW	47	#define DEBUGP(format, args...) \
	48	printk(KERN_DEBUG "%s(%d):%s(): " format, __FILE__, \
	49	__LINE__, __FUNCTION__, ## args)
f9e815b3 HW	50	#else
	51	#define DEBUGP(format, args...)
	52	#endif
	53
	54	static struct sock *nfnl = NULL;
	55	static struct nfnetlink_subsystem *subsys_table[NFNL_SUBSYS_COUNT];
	56	DECLARE_MUTEX(nfnl_sem);
	57
	58	void nfnl_lock(void)
	59	{
	60	nfnl_shlock();
	61	}
	62
	63	void nfnl_unlock(void)
	64	{
	65	nfnl_shunlock();
	66	}
	67
	68	int nfnetlink_subsys_register(struct nfnetlink_subsystem *n)
	69	{
	70	DEBUGP("registering subsystem ID %u\n", n->subsys_id);
	71
f9e815b3	72	nfnl_lock();
0ab43f84 HW	73	if (subsys_table[n->subsys_id]) {
	74	nfnl_unlock();
	75	return -EBUSY;
	76	}
f9e815b3 HW	77	subsys_table[n->subsys_id] = n;
	78	nfnl_unlock();
	79
	80	return 0;
	81	}
	82
	83	int nfnetlink_subsys_unregister(struct nfnetlink_subsystem *n)
	84	{
	85	DEBUGP("unregistering subsystem ID %u\n", n->subsys_id);
	86
	87	nfnl_lock();
	88	subsys_table[n->subsys_id] = NULL;
	89	nfnl_unlock();
	90
	91	return 0;
	92	}
	93
	94	static inline struct nfnetlink_subsystem *nfnetlink_get_subsys(u_int16_t type)
	95	{
	96	u_int8_t subsys_id = NFNL_SUBSYS_ID(type);
	97
	98	if (subsys_id >= NFNL_SUBSYS_COUNT
	99	\|\| subsys_table[subsys_id] == NULL)
	100	return NULL;
	101
	102	return subsys_table[subsys_id];
	103	}
	104
	105	static inline struct nfnl_callback *
	106	nfnetlink_find_client(u_int16_t type, struct nfnetlink_subsystem *ss)
	107	{
	108	u_int8_t cb_id = NFNL_MSG_TYPE(type);
	109
	110	if (cb_id >= ss->cb_count) {
	111	DEBUGP("msgtype %u >= %u, returning\n", type, ss->cb_count);
	112	return NULL;
	113	}
	114
	115	return &ss->cb[cb_id];
	116	}
	117
	118	void __nfa_fill(struct sk_buff *skb, int attrtype, int attrlen,
	119	const void *data)
	120	{
	121	struct nfattr *nfa;
	122	int size = NFA_LENGTH(attrlen);
	123
	124	nfa = (struct nfattr *)skb_put(skb, NFA_ALIGN(size));
	125	nfa->nfa_type = attrtype;
	126	nfa->nfa_len = size;
	127	memcpy(NFA_DATA(nfa), data, attrlen);
080774a2	128	memset(NFA_DATA(nfa) + attrlen, 0, NFA_ALIGN(size) - size);
f9e815b3 HW	129	}
	130
	131	int nfattr_parse(struct nfattr tb[], int maxattr, struct nfattr nfa, int len)
	132	{
	133	memset(tb, 0, sizeof(struct nfattr ) maxattr);
	134
	135	while (NFA_OK(nfa, len)) {
	136	unsigned flavor = nfa->nfa_type;
	137	if (flavor && flavor <= maxattr)
	138	tb[flavor-1] = nfa;
	139	nfa = NFA_NEXT(nfa, len);
	140	}
	141
	142	return 0;
	143	}
	144
	145	/**
	146	* nfnetlink_check_attributes - check and parse nfnetlink attributes
	147	*
	148	* subsys: nfnl subsystem for which this message is to be parsed
	149	* nlmsghdr: netlink message to be checked/parsed
	150	* cda: array of pointers, needs to be at least subsys->attr_count big
	151	*
	152	*/
	153	static int
	154	nfnetlink_check_attributes(struct nfnetlink_subsystem *subsys,
	155	struct nlmsghdr nlh, struct nfattr cda[])
	156	{
	157	int min_len;
	158
	159	memset(cda, 0, sizeof(struct nfattr ) subsys->attr_count);
	160
	161	/* check attribute lengths. */
	162	min_len = NLMSG_ALIGN(sizeof(struct nfgenmsg));
	163	if (nlh->nlmsg_len < min_len)
	164	return -EINVAL;
	165
	166	if (nlh->nlmsg_len > min_len) {
	167	struct nfattr *attr = NFM_NFA(NLMSG_DATA(nlh));
	168	int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
	169
	170	while (NFA_OK(attr, attrlen)) {
	171	unsigned flavor = attr->nfa_type;
	172	if (flavor) {
	173	if (flavor > subsys->attr_count)
	174	return -EINVAL;
	175	cda[flavor - 1] = attr;
	176	}
	177	attr = NFA_NEXT(attr, attrlen);
	178	}
	179	} else
	180	return -EINVAL;
	181
	182	return 0;
	183	}
	184
	185	int nfnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
	186	{
	187	int allocation = in_interrupt() ? GFP_ATOMIC : GFP_KERNEL;
	188	int err = 0;
	189
	190	NETLINK_CB(skb).dst_groups = group;
	191	if (echo)
	192	atomic_inc(&skb->users);
193	netlink_broadcast(nfnl, skb, pid, group, allocation);
194	if (echo)
195	err = netlink_unicast(nfnl, skb, pid, MSG_DONTWAIT);
196
197	return err;
198	}
199
200	int nfnetlink_unicast(struct sk_buff *skb, u_int32_t pid, int flags)
201	{
202	return netlink_unicast(nfnl, skb, pid, flags);
203	}
204
205	/* Process one complete nfnetlink message. */
206	static inline int nfnetlink_rcv_msg(struct sk_buff *skb,
207	struct nlmsghdr nlh, int errp)
208	{
209	struct nfnl_callback *nc;
210	struct nfnetlink_subsystem *ss;
211	int type, err = 0;
212
213	DEBUGP("entered; subsys=%u, msgtype=%u\n",
214	NFNL_SUBSYS_ID(nlh->nlmsg_type),
215	NFNL_MSG_TYPE(nlh->nlmsg_type));
216
217	/* Only requests are handled by kernel now. */
218	if (!(nlh->nlmsg_flags & NLM_F_REQUEST)) {
219	DEBUGP("received non-request message\n");
220	return 0;
221	}
222
223	/* All the messages must at least contain nfgenmsg */
224	if (nlh->nlmsg_len <
225	NLMSG_LENGTH(NLMSG_ALIGN(sizeof(struct nfgenmsg)))) {
226	DEBUGP("received message was too short\n");
227	return 0;
228	}
229
230	type = nlh->nlmsg_type;
231	ss = nfnetlink_get_subsys(type);
0ab43f84 HW	232	if (!ss) {
	233	#ifdef CONFIG_KMOD
	234	/* don't call nfnl_shunlock, since it would reenter
	235	* with further packet processing */
	236	up(&nfnl_sem);
	237	request_module("nfnetlink-subsys-%d", NFNL_SUBSYS_ID(type));
	238	nfnl_shlock();
	239	ss = nfnetlink_get_subsys(type);
	240	if (!ss)
	241	#endif
f9e815b3	242	goto err_inval;
0ab43f84	243	}
f9e815b3 HW	244
	245	nc = nfnetlink_find_client(type, ss);
	246	if (!nc) {
	247	DEBUGP("unable to find client for type %d\n", type);
	248	goto err_inval;
	249	}
	250
	251	if (nc->cap_required &&
	252	!cap_raised(NETLINK_CB(skb).eff_cap, nc->cap_required)) {
	253	DEBUGP("permission denied for type %d\n", type);
	254	*errp = -EPERM;
	255	return -1;
	256	}
	257
	258	{
	259	struct nfattr *cda[ss->attr_count];
	260
	261	memset(cda, 0, ss->attr_countsizeof(struct nfattr ));
	262
	263	err = nfnetlink_check_attributes(ss, nlh, cda);
	264	if (err < 0)
	265	goto err_inval;
	266
0ab43f84	267	DEBUGP("calling handler\n");
f9e815b3 HW	268	err = nc->call(nfnl, skb, nlh, cda, errp);
	269	*errp = err;
	270	return err;
	271	}
	272
	273	err_inval:
0ab43f84	274	DEBUGP("returning -EINVAL\n");
f9e815b3 HW	275	*errp = -EINVAL;
	276	return -1;
	277	}
	278
	279	/* Process one packet of messages. */
	280	static inline int nfnetlink_rcv_skb(struct sk_buff *skb)
	281	{
	282	int err;
	283	struct nlmsghdr *nlh;
	284
	285	while (skb->len >= NLMSG_SPACE(0)) {
	286	u32 rlen;
	287
	288	nlh = (struct nlmsghdr *)skb->data;
	289	if (nlh->nlmsg_len < sizeof(struct nlmsghdr)
	290	\|\| skb->len < nlh->nlmsg_len)
	291	return 0;
	292	rlen = NLMSG_ALIGN(nlh->nlmsg_len);
	293	if (rlen > skb->len)
	294	rlen = skb->len;
	295	if (nfnetlink_rcv_msg(skb, nlh, &err)) {
	296	if (!err)
	297	return -1;
	298	netlink_ack(skb, nlh, err);
	299	} else
	300	if (nlh->nlmsg_flags & NLM_F_ACK)
	301	netlink_ack(skb, nlh, 0);
	302	skb_pull(skb, rlen);
	303	}
	304
	305	return 0;
	306	}
	307
	308	static void nfnetlink_rcv(struct sock *sk, int len)
	309	{
	310	do {
	311	struct sk_buff *skb;
	312
	313	if (nfnl_shlock_nowait())
	314	return;
	315
	316	while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
	317	if (nfnetlink_rcv_skb(skb)) {
	318	if (skb->len)
	319	skb_queue_head(&sk->sk_receive_queue,
	320	skb);
	321	else
	322	kfree_skb(skb);
	323	break;
	324	}
	325	kfree_skb(skb);
	326	}
	327
0ab43f84 HW	328	/* don't call nfnl_shunlock, since it would reenter
0ab43f84 HW	329	* with further packet processing */
f9e815b3 HW	330	up(&nfnl_sem);
	331	} while(nfnl && nfnl->sk_receive_queue.qlen);
	332	}
	333
	334	void __exit nfnetlink_exit(void)
	335	{
	336	printk("Removing netfilter NETLINK layer.\n");
	337	sock_release(nfnl->sk_socket);
	338	return;
	339	}
	340
	341	int __init nfnetlink_init(void)
	342	{
	343	printk("Netfilter messages via NETLINK v%s.\n", nfversion);
	344
4fdb3bb7 HW	345	nfnl = netlink_kernel_create(NETLINK_NETFILTER, nfnetlink_rcv,
4fdb3bb7 HW	346	THIS_MODULE);
f9e815b3 HW	347	if (!nfnl) {
	348	printk(KERN_ERR "cannot initialize nfnetlink!\n");
	349	return -1;
	350	}
	351
	352	return 0;
	353	}
	354
	355	module_init(nfnetlink_init);
	356	module_exit(nfnetlink_exit);
	357
	358	EXPORT_SYMBOL_GPL(nfnetlink_subsys_register);
	359	EXPORT_SYMBOL_GPL(nfnetlink_subsys_unregister);
	360	EXPORT_SYMBOL_GPL(nfnetlink_send);
	361	EXPORT_SYMBOL_GPL(nfnetlink_unicast);
	362	EXPORT_SYMBOL_GPL(nfattr_parse);
	363	EXPORT_SYMBOL_GPL(__nfa_fill);