[mirror_ubuntu-artful-kernel.git] / include / net / netfilter / nf_conntrack.h

/*
 * Connection state tracking for netfilter.  This is separated from,
 * but required by, the (future) NAT layer; it can also be used by an iptables
 * extension.
 *
 * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
 *	- generalize L3 protocol dependent part.
 *
 * Derived from include/linux/netfiter_ipv4/ip_conntrack.h
 */

#ifndef _NF_CONNTRACK_H
#define _NF_CONNTRACK_H

#include <linux/netfilter/nf_conntrack_common.h>

#ifdef __KERNEL__
#include <linux/bitops.h>
#include <linux/compiler.h>
#include <asm/atomic.h>

#include <linux/netfilter/nf_conntrack_tcp.h>
#include <linux/netfilter/nf_conntrack_sctp.h>
#include <linux/netfilter/nf_conntrack_proto_gre.h>
#include <net/netfilter/ipv4/nf_conntrack_icmp.h>
#include <net/netfilter/ipv6/nf_conntrack_icmpv6.h>

#include <net/netfilter/nf_conntrack_tuple.h>

/* per conntrack: protocol private data */
union nf_conntrack_proto {
	/* insert conntrack proto private data here */
	struct ip_ct_sctp sctp;
	struct ip_ct_tcp tcp;
	struct ip_ct_icmp icmp;
	struct nf_ct_icmpv6 icmpv6;
	struct nf_ct_gre gre;
};

union nf_conntrack_expect_proto {
	/* insert expect proto private data here */
};

/* Add protocol helper include file here */
#include <linux/netfilter/nf_conntrack_ftp.h>
#include <linux/netfilter/nf_conntrack_pptp.h>
#include <linux/netfilter/nf_conntrack_h323.h>

/* per conntrack: application helper private data */
union nf_conntrack_help {
	/* insert conntrack helper private data (master) here */
	struct nf_ct_ftp_master ct_ftp_info;
	struct nf_ct_pptp_master ct_pptp_info;
	struct nf_ct_h323_master ct_h323_info;
};

#include <linux/types.h>
#include <linux/skbuff.h>

#ifdef CONFIG_NETFILTER_DEBUG
#define NF_CT_ASSERT(x)							\
do {									\
	if (!(x))							\
		/* Wooah!  I'm tripping my conntrack in a frenzy of	\
		   netplay... */					\
		printk("NF_CT_ASSERT: %s:%i(%s)\n",			\
		       __FILE__, __LINE__, __FUNCTION__);		\
} while(0)
#else
#define NF_CT_ASSERT(x)
#endif

struct nf_conntrack_helper;

/* nf_conn feature for connections that have a helper */
struct nf_conn_help {
	/* Helper. if any */
	struct nf_conntrack_helper *helper;

	union nf_conntrack_help help;

	/* Current number of expected connections */
	unsigned int expecting;
};


#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>

struct nf_conn
{
	/* Usage count in here is 1 for hash table/destruct timer, 1 per skb,
           plus 1 for any connection(s) we are `master' for */
	struct nf_conntrack ct_general;

	/* XXX should I move this to the tail ? - Y.K */
	/* These are my tuples; original and reply */
	struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];

	/* Have we seen traffic both ways yet? (bitset) */
	unsigned long status;

	/* If we were expected by an expectation, this will be it */
	struct nf_conn *master;

	/* Timer function; drops refcnt when it goes off. */
	struct timer_list timeout;

#ifdef CONFIG_NF_CT_ACCT
	/* Accounting Information (same cache line as other written members) */
	struct ip_conntrack_counter counters[IP_CT_DIR_MAX];
#endif

	/* Unique ID that identifies this conntrack*/
	unsigned int id;

	/* features - nat, helper, ... used by allocating system */
	u_int32_t features;

#if defined(CONFIG_NF_CONNTRACK_MARK)
	u_int32_t mark;
#endif

#ifdef CONFIG_NF_CONNTRACK_SECMARK
	u_int32_t secmark;
#endif

	/* Storage reserved for other modules: */
	union nf_conntrack_proto proto;

	/* features dynamically at the end: helper, nat (both optional) */
	char data[0];
};

static inline struct nf_conn *
nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash)
{
	return container_of(hash, struct nf_conn,
			    tuplehash[hash->tuple.dst.dir]);
}

/* get master conntrack via master expectation */
#define master_ct(conntr) (conntr->master)

/* Alter reply tuple (maybe alter helper). */
extern void
nf_conntrack_alter_reply(struct nf_conn *conntrack,
			 const struct nf_conntrack_tuple *newreply);

/* Is this tuple taken? (ignoring any belonging to the given
   conntrack). */
extern int
nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
			 const struct nf_conn *ignored_conntrack);

/* Return conntrack_info and tuple hash for given skb. */
static inline struct nf_conn *
nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo)
{
	*ctinfo = skb->nfctinfo;
	return (struct nf_conn *)skb->nfct;
}

/* decrement reference count on a conntrack */
static inline void nf_ct_put(struct nf_conn *ct)
{
	NF_CT_ASSERT(ct);
	nf_conntrack_put(&ct->ct_general);
}

/* Protocol module loading */
extern int nf_ct_l3proto_try_module_get(unsigned short l3proto);
extern void nf_ct_l3proto_module_put(unsigned short l3proto);

extern struct nf_conntrack_tuple_hash *
__nf_conntrack_find(const struct nf_conntrack_tuple *tuple,
		    const struct nf_conn *ignored_conntrack);

extern void nf_conntrack_hash_insert(struct nf_conn *ct);

extern void nf_conntrack_flush(void);

extern struct nf_conntrack_helper *
nf_ct_helper_find_get( const struct nf_conntrack_tuple *tuple);
extern void nf_ct_helper_put(struct nf_conntrack_helper *helper);

extern struct nf_conntrack_helper *
__nf_conntrack_helper_find_byname(const char *name);

extern int nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
				const struct nf_conntrack_tuple *orig);

extern void __nf_ct_refresh_acct(struct nf_conn *ct,
				 enum ip_conntrack_info ctinfo,
				 const struct sk_buff *skb,
				 unsigned long extra_jiffies,
				 int do_acct);

/* Refresh conntrack for this many jiffies and do accounting */
static inline void nf_ct_refresh_acct(struct nf_conn *ct,
				      enum ip_conntrack_info ctinfo,
				      const struct sk_buff *skb,
				      unsigned long extra_jiffies)
{
	__nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
}

/* Refresh conntrack for this many jiffies */
static inline void nf_ct_refresh(struct nf_conn *ct,
				 const struct sk_buff *skb,
				 unsigned long extra_jiffies)
{
	__nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
}

/* These are for NAT.  Icky. */
/* Update TCP window tracking data when NAT mangles the packet */
extern void nf_conntrack_tcp_update(struct sk_buff *skb,
				    unsigned int dataoff,
				    struct nf_conn *conntrack,
				    int dir);

/* Call me when a conntrack is destroyed. */
extern void (*nf_conntrack_destroyed)(struct nf_conn *conntrack);

/* Fake conntrack entry for untracked connections */
extern struct nf_conn nf_conntrack_untracked;

extern int nf_ct_no_defrag;

/* Iterate over all conntracks: if iter returns true, it's deleted. */
extern void
nf_ct_iterate_cleanup(int (*iter)(struct nf_conn *i, void *data), void *data);
extern void nf_conntrack_free(struct nf_conn *ct);
extern struct nf_conn *
nf_conntrack_alloc(const struct nf_conntrack_tuple *orig,
		   const struct nf_conntrack_tuple *repl);

/* It's confirmed if it is, or has been in the hash table. */
static inline int nf_ct_is_confirmed(struct nf_conn *ct)
{
	return test_bit(IPS_CONFIRMED_BIT, &ct->status);
}

static inline int nf_ct_is_dying(struct nf_conn *ct)
{
	return test_bit(IPS_DYING_BIT, &ct->status);
}

extern unsigned int nf_conntrack_htable_size;
extern int nf_conntrack_checksum;
extern atomic_t nf_conntrack_count;
extern int nf_conntrack_max;

DECLARE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat);
#define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++)

/* no helper, no nat */
#define	NF_CT_F_BASIC	0
/* for helper */
#define	NF_CT_F_HELP	1
/* for nat. */
#define	NF_CT_F_NAT	2
#define NF_CT_F_NUM	4

extern int
nf_conntrack_register_cache(u_int32_t features, const char *name, size_t size);
extern void
nf_conntrack_unregister_cache(u_int32_t features);

/* valid combinations:
 * basic: nf_conn, nf_conn .. nf_conn_help
 * nat: nf_conn .. nf_conn_nat, nf_conn .. nf_conn_nat .. nf_conn help
 */
#ifdef CONFIG_NF_NAT_NEEDED
static inline struct nf_conn_nat *nfct_nat(const struct nf_conn *ct)
{
	unsigned int offset = sizeof(struct nf_conn);

	if (!(ct->features & NF_CT_F_NAT))
		return NULL;

	offset = ALIGN(offset, __alignof__(struct nf_conn_nat));
	return (struct nf_conn_nat *) ((void *)ct + offset);
}

static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct)
{
	unsigned int offset = sizeof(struct nf_conn);

	if (!(ct->features & NF_CT_F_HELP))
		return NULL;
	if (ct->features & NF_CT_F_NAT) {
		offset = ALIGN(offset, __alignof__(struct nf_conn_nat));
		offset += sizeof(struct nf_conn_nat);
	}

	offset = ALIGN(offset, __alignof__(struct nf_conn_help));
	return (struct nf_conn_help *) ((void *)ct + offset);
}
#else /* No NAT */
static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct)
{
	unsigned int offset = sizeof(struct nf_conn);

	if (!(ct->features & NF_CT_F_HELP))
		return NULL;

	offset = ALIGN(offset, __alignof__(struct nf_conn_help));
	return (struct nf_conn_help *) ((void *)ct + offset);
}
#endif /* CONFIG_NF_NAT_NEEDED */
#endif /* __KERNEL__ */
#endif /* _NF_CONNTRACK_H */
Commit	Line	Data
9fb9cbb1 YK	1	/*
	2	* Connection state tracking for netfilter. This is separated from,
	3	* but required by, the (future) NAT layer; it can also be used by an iptables
	4	* extension.
	5	*
	6	* 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
	7	* - generalize L3 protocol dependent part.
	8	*
	9	* Derived from include/linux/netfiter_ipv4/ip_conntrack.h
	10	*/
	11
	12	#ifndef _NF_CONNTRACK_H
	13	#define _NF_CONNTRACK_H
	14
	15	#include <linux/netfilter/nf_conntrack_common.h>
	16
	17	#ifdef __KERNEL__
9fb9cbb1 YK	18	#include <linux/bitops.h>
	19	#include <linux/compiler.h>
	20	#include <asm/atomic.h>
	21
	22	#include <linux/netfilter/nf_conntrack_tcp.h>
	23	#include <linux/netfilter/nf_conntrack_sctp.h>
f09943fe	24	#include <linux/netfilter/nf_conntrack_proto_gre.h>
9fb9cbb1 YK	25	#include <net/netfilter/ipv4/nf_conntrack_icmp.h>
	26	#include <net/netfilter/ipv6/nf_conntrack_icmpv6.h>
	27
	28	#include <net/netfilter/nf_conntrack_tuple.h>
	29
	30	/* per conntrack: protocol private data */
	31	union nf_conntrack_proto {
	32	/* insert conntrack proto private data here */
	33	struct ip_ct_sctp sctp;
	34	struct ip_ct_tcp tcp;
	35	struct ip_ct_icmp icmp;
	36	struct nf_ct_icmpv6 icmpv6;
f09943fe	37	struct nf_ct_gre gre;
9fb9cbb1 YK	38	};
	39
	40	union nf_conntrack_expect_proto {
	41	/* insert expect proto private data here */
	42	};
	43
	44	/* Add protocol helper include file here */
	45	#include <linux/netfilter/nf_conntrack_ftp.h>
f09943fe	46	#include <linux/netfilter/nf_conntrack_pptp.h>
f587de0e	47	#include <linux/netfilter/nf_conntrack_h323.h>
9fb9cbb1 YK	48
	49	/* per conntrack: application helper private data */
	50	union nf_conntrack_help {
	51	/* insert conntrack helper private data (master) here */
55a73324	52	struct nf_ct_ftp_master ct_ftp_info;
f09943fe	53	struct nf_ct_pptp_master ct_pptp_info;
f587de0e	54	struct nf_ct_h323_master ct_h323_info;
9fb9cbb1 YK	55	};
	56
	57	#include <linux/types.h>
	58	#include <linux/skbuff.h>
	59
	60	#ifdef CONFIG_NETFILTER_DEBUG
	61	#define NF_CT_ASSERT(x) \
	62	do { \
	63	if (!(x)) \
	64	/* Wooah! I'm tripping my conntrack in a frenzy of \
	65	netplay... */ \
	66	printk("NF_CT_ASSERT: %s:%i(%s)\n", \
	67	__FILE__, __LINE__, __FUNCTION__); \
	68	} while(0)
	69	#else
	70	#define NF_CT_ASSERT(x)
	71	#endif
	72
	73	struct nf_conntrack_helper;
	74
dc808fe2 HW	75	/* nf_conn feature for connections that have a helper */
	76	struct nf_conn_help {
	77	/* Helper. if any */
	78	struct nf_conntrack_helper *helper;
	79
	80	union nf_conntrack_help help;
	81
	82	/* Current number of expected connections */
	83	unsigned int expecting;
	84	};
	85
	86
9fb9cbb1	87	#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
f8eb24a8 PM	88	#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
f8eb24a8 PM	89
9fb9cbb1 YK	90	struct nf_conn
	91	{
	92	/* Usage count in here is 1 for hash table/destruct timer, 1 per skb,
	93	plus 1 for any connection(s) we are `master' for */
	94	struct nf_conntrack ct_general;
	95
	96	/* XXX should I move this to the tail ? - Y.K */
	97	/* These are my tuples; original and reply */
	98	struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
	99
	100	/* Have we seen traffic both ways yet? (bitset) */
	101	unsigned long status;
	102
dc808fe2 HW	103	/* If we were expected by an expectation, this will be it */
	104	struct nf_conn *master;
	105
9fb9cbb1 YK	106	/* Timer function; drops refcnt when it goes off. */
	107	struct timer_list timeout;
	108
	109	#ifdef CONFIG_NF_CT_ACCT
	110	/* Accounting Information (same cache line as other written members) */
	111	struct ip_conntrack_counter counters[IP_CT_DIR_MAX];
	112	#endif
9fb9cbb1	113
c1d10adb PNA	114	/* Unique ID that identifies this conntrack*/
	115	unsigned int id;
	116
9fb9cbb1 YK	117	/* features - nat, helper, ... used by allocating system */
	118	u_int32_t features;
	119
9fb9cbb1 YK	120	#if defined(CONFIG_NF_CONNTRACK_MARK)
	121	u_int32_t mark;
	122	#endif
	123
7c9728c3 JM	124	#ifdef CONFIG_NF_CONNTRACK_SECMARK
	125	u_int32_t secmark;
	126	#endif
	127
dc808fe2 HW	128	/* Storage reserved for other modules: */
dc808fe2 HW	129	union nf_conntrack_proto proto;
9fb9cbb1	130
dc808fe2 HW	131	/* features dynamically at the end: helper, nat (both optional) */
dc808fe2 HW	132	char data[0];
9fb9cbb1 YK	133	};
9fb9cbb1 YK	134
9fb9cbb1 YK	135	static inline struct nf_conn *
	136	nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash)
	137	{
	138	return container_of(hash, struct nf_conn,
	139	tuplehash[hash->tuple.dst.dir]);
	140	}
	141
	142	/* get master conntrack via master expectation */
	143	#define master_ct(conntr) (conntr->master)
	144
	145	/* Alter reply tuple (maybe alter helper). */
	146	extern void
	147	nf_conntrack_alter_reply(struct nf_conn *conntrack,
	148	const struct nf_conntrack_tuple *newreply);
	149
	150	/* Is this tuple taken? (ignoring any belonging to the given
	151	conntrack). */
	152	extern int
	153	nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
	154	const struct nf_conn *ignored_conntrack);
	155
	156	/* Return conntrack_info and tuple hash for given skb. */
	157	static inline struct nf_conn *
	158	nf_ct_get(const struct sk_buff skb, enum ip_conntrack_info ctinfo)
	159	{
	160	*ctinfo = skb->nfctinfo;
	161	return (struct nf_conn *)skb->nfct;
	162	}
	163
	164	/* decrement reference count on a conntrack */
	165	static inline void nf_ct_put(struct nf_conn *ct)
	166	{
	167	NF_CT_ASSERT(ct);
	168	nf_conntrack_put(&ct->ct_general);
	169	}
	170
b9f78f9f PNA	171	/* Protocol module loading */
	172	extern int nf_ct_l3proto_try_module_get(unsigned short l3proto);
	173	extern void nf_ct_l3proto_module_put(unsigned short l3proto);
	174
c1d10adb PNA	175	extern struct nf_conntrack_tuple_hash *
	176	__nf_conntrack_find(const struct nf_conntrack_tuple *tuple,
	177	const struct nf_conn *ignored_conntrack);
	178
	179	extern void nf_conntrack_hash_insert(struct nf_conn *ct);
	180
c1d10adb PNA	181	extern void nf_conntrack_flush(void);
	182
	183	extern struct nf_conntrack_helper *
	184	nf_ct_helper_find_get( const struct nf_conntrack_tuple *tuple);
	185	extern void nf_ct_helper_put(struct nf_conntrack_helper *helper);
	186
	187	extern struct nf_conntrack_helper *
	188	__nf_conntrack_helper_find_byname(const char *name);
	189
9fb9cbb1 YK	190	extern int nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
	191	const struct nf_conntrack_tuple *orig);
	192
	193	extern void __nf_ct_refresh_acct(struct nf_conn *ct,
	194	enum ip_conntrack_info ctinfo,
	195	const struct sk_buff *skb,
	196	unsigned long extra_jiffies,
	197	int do_acct);
	198
	199	/* Refresh conntrack for this many jiffies and do accounting */
	200	static inline void nf_ct_refresh_acct(struct nf_conn *ct,
	201	enum ip_conntrack_info ctinfo,
	202	const struct sk_buff *skb,
	203	unsigned long extra_jiffies)
	204	{
	205	__nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
	206	}
	207
	208	/* Refresh conntrack for this many jiffies */
	209	static inline void nf_ct_refresh(struct nf_conn *ct,
	210	const struct sk_buff *skb,
	211	unsigned long extra_jiffies)
	212	{
	213	__nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
	214	}
	215
	216	/* These are for NAT. Icky. */
	217	/* Update TCP window tracking data when NAT mangles the packet */
	218	extern void nf_conntrack_tcp_update(struct sk_buff *skb,
	219	unsigned int dataoff,
	220	struct nf_conn *conntrack,
	221	int dir);
	222
	223	/* Call me when a conntrack is destroyed. */
	224	extern void (nf_conntrack_destroyed)(struct nf_conn conntrack);
	225
	226	/* Fake conntrack entry for untracked connections */
	227	extern struct nf_conn nf_conntrack_untracked;
	228
	229	extern int nf_ct_no_defrag;
	230
	231	/* Iterate over all conntracks: if iter returns true, it's deleted. */
	232	extern void
	233	nf_ct_iterate_cleanup(int (iter)(struct nf_conn i, void data), void data);
	234	extern void nf_conntrack_free(struct nf_conn *ct);
	235	extern struct nf_conn *
	236	nf_conntrack_alloc(const struct nf_conntrack_tuple *orig,
	237	const struct nf_conntrack_tuple *repl);
	238
	239	/* It's confirmed if it is, or has been in the hash table. */
	240	static inline int nf_ct_is_confirmed(struct nf_conn *ct)
	241	{
	242	return test_bit(IPS_CONFIRMED_BIT, &ct->status);
	243	}
	244
	245	static inline int nf_ct_is_dying(struct nf_conn *ct)
	246	{
	247	return test_bit(IPS_DYING_BIT, &ct->status);
	248	}
	249
	250	extern unsigned int nf_conntrack_htable_size;
39a27a35	251	extern int nf_conntrack_checksum;
f8eb24a8 PM	252	extern atomic_t nf_conntrack_count;
f8eb24a8 PM	253	extern int nf_conntrack_max;
9fb9cbb1	254
f8eb24a8	255	DECLARE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat);
9fb9cbb1 YK	256	#define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++)
9fb9cbb1 YK	257
9fb9cbb1 YK	258	/* no helper, no nat */
	259	#define NF_CT_F_BASIC 0
	260	/* for helper */
	261	#define NF_CT_F_HELP 1
	262	/* for nat. */
	263	#define NF_CT_F_NAT 2
	264	#define NF_CT_F_NUM 4
	265
	266	extern int
dc808fe2	267	nf_conntrack_register_cache(u_int32_t features, const char *name, size_t size);
9fb9cbb1 YK	268	extern void
	269	nf_conntrack_unregister_cache(u_int32_t features);
	270
dc808fe2 HW	271	/* valid combinations:
dc808fe2 HW	272	* basic: nf_conn, nf_conn .. nf_conn_help
5b1158e9	273	* nat: nf_conn .. nf_conn_nat, nf_conn .. nf_conn_nat .. nf_conn help
dc808fe2	274	*/
5b1158e9 JK	275	#ifdef CONFIG_NF_NAT_NEEDED
	276	static inline struct nf_conn_nat nfct_nat(const struct nf_conn ct)
	277	{
	278	unsigned int offset = sizeof(struct nf_conn);
	279
	280	if (!(ct->features & NF_CT_F_NAT))
	281	return NULL;
	282
	283	offset = ALIGN(offset, __alignof__(struct nf_conn_nat));
	284	return (struct nf_conn_nat ) ((void )ct + offset);
	285	}
	286
dc808fe2 HW	287	static inline struct nf_conn_help nfct_help(const struct nf_conn ct)
	288	{
	289	unsigned int offset = sizeof(struct nf_conn);
	290
	291	if (!(ct->features & NF_CT_F_HELP))
	292	return NULL;
5b1158e9 JK	293	if (ct->features & NF_CT_F_NAT) {
	294	offset = ALIGN(offset, __alignof__(struct nf_conn_nat));
	295	offset += sizeof(struct nf_conn_nat);
	296	}
dc808fe2	297
f9aae958	298	offset = ALIGN(offset, __alignof__(struct nf_conn_help));
dc808fe2 HW	299	return (struct nf_conn_help ) ((void )ct + offset);
dc808fe2 HW	300	}
5b1158e9 JK	301	#else /* No NAT */
	302	static inline struct nf_conn_help nfct_help(const struct nf_conn ct)
	303	{
	304	unsigned int offset = sizeof(struct nf_conn);
	305
	306	if (!(ct->features & NF_CT_F_HELP))
	307	return NULL;
dc808fe2	308
5b1158e9 JK	309	offset = ALIGN(offset, __alignof__(struct nf_conn_help));
	310	return (struct nf_conn_help ) ((void )ct + offset);
	311	}
	312	#endif /* CONFIG_NF_NAT_NEEDED */
9fb9cbb1 YK	313	#endif /* __KERNEL__ */
9fb9cbb1 YK	314	#endif /* _NF_CONNTRACK_H */