[deliverable/linux.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/config.h>
#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 <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;
};

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

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

/* per conntrack: application helper private data */
union nf_conntrack_help {
	/* insert conntrack helper private data (master) here */
	struct ip_ct_ftp_master ct_ftp_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>
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];
};

struct nf_conntrack_expect
{
	/* Internal linked list (global expectation list) */
	struct list_head list;

	/* We expect this tuple, with the following mask */
	struct nf_conntrack_tuple tuple, mask;
 
	/* Function to call after setup and insertion */
	void (*expectfn)(struct nf_conn *new,
			 struct nf_conntrack_expect *this);

	/* The conntrack of the master connection */
	struct nf_conn *master;

	/* Timer function; deletes the expectation. */
	struct timer_list timeout;

	/* Usage count. */
	atomic_t use;

	/* Unique ID */
	unsigned int id;

	/* Flags */
	unsigned int flags;

#ifdef CONFIG_NF_NAT_NEEDED
	/* This is the original per-proto part, used to map the
	 * expected connection the way the recipient expects. */
	union nf_conntrack_manip_proto saved_proto;
	/* Direction relative to the master connection. */
	enum ip_conntrack_dir dir;
#endif
};

#define NF_CT_EXPECT_PERMANENT 0x1

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 struct nf_conntrack_expect *
__nf_conntrack_expect_find(const struct nf_conntrack_tuple *tuple);

extern struct nf_conntrack_expect *
nf_conntrack_expect_find(const struct nf_conntrack_tuple *tuple);

extern void nf_ct_unlink_expect(struct nf_conntrack_expect *exp);

extern void nf_ct_remove_expectations(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;

#define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++)

#ifdef CONFIG_NF_CONNTRACK_EVENTS
#include <linux/notifier.h>
#include <linux/interrupt.h>

struct nf_conntrack_ecache {
	struct nf_conn *ct;
	unsigned int events;
};
DECLARE_PER_CPU(struct nf_conntrack_ecache, nf_conntrack_ecache);

#define CONNTRACK_ECACHE(x)	(__get_cpu_var(nf_conntrack_ecache).x)

extern struct atomic_notifier_head nf_conntrack_chain;
extern struct atomic_notifier_head nf_conntrack_expect_chain;

static inline int nf_conntrack_register_notifier(struct notifier_block *nb)
{
	return atomic_notifier_chain_register(&nf_conntrack_chain, nb);
}

static inline int nf_conntrack_unregister_notifier(struct notifier_block *nb)
{
	return atomic_notifier_chain_unregister(&nf_conntrack_chain, nb);
}

static inline int
nf_conntrack_expect_register_notifier(struct notifier_block *nb)
{
	return atomic_notifier_chain_register(&nf_conntrack_expect_chain, nb);
}

static inline int
nf_conntrack_expect_unregister_notifier(struct notifier_block *nb)
{
	return atomic_notifier_chain_unregister(&nf_conntrack_expect_chain,
			nb);
}

extern void nf_ct_deliver_cached_events(const struct nf_conn *ct);
extern void __nf_ct_event_cache_init(struct nf_conn *ct);

static inline void
nf_conntrack_event_cache(enum ip_conntrack_events event,
			 const struct sk_buff *skb)
{
	struct nf_conn *ct = (struct nf_conn *)skb->nfct;
	struct nf_conntrack_ecache *ecache;

	local_bh_disable();
	ecache = &__get_cpu_var(nf_conntrack_ecache);
	if (ct != ecache->ct)
		__nf_ct_event_cache_init(ct);
	ecache->events |= event;
	local_bh_enable();
}

static inline void nf_conntrack_event(enum ip_conntrack_events event,
				      struct nf_conn *ct)
{
	if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct))
		atomic_notifier_call_chain(&nf_conntrack_chain, event, ct);
}

static inline void
nf_conntrack_expect_event(enum ip_conntrack_expect_events event,
			  struct nf_conntrack_expect *exp)
{
	atomic_notifier_call_chain(&nf_conntrack_expect_chain, event, exp);
}
#else /* CONFIG_NF_CONNTRACK_EVENTS */
static inline void nf_conntrack_event_cache(enum ip_conntrack_events event,
					    const struct sk_buff *skb) {}
static inline void nf_conntrack_event(enum ip_conntrack_events event,
				      struct nf_conn *ct) {}
static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {}
static inline void
nf_conntrack_expect_event(enum ip_conntrack_expect_events event,
			  struct nf_conntrack_expect *exp) {}
#endif /* CONFIG_NF_CONNTRACK_EVENTS */

/* 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
 */
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;

	return (struct nf_conn_help *) ((void *)ct + offset);
}

#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__
	18	#include <linux/config.h>
	19	#include <linux/bitops.h>
	20	#include <linux/compiler.h>
	21	#include <asm/atomic.h>
	22
	23	#include <linux/netfilter/nf_conntrack_tcp.h>
	24	#include <linux/netfilter/nf_conntrack_sctp.h>
	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;
	37	};
	38
	39	union nf_conntrack_expect_proto {
	40	/* insert expect proto private data here */
	41	};
	42
	43	/* Add protocol helper include file here */
	44	#include <linux/netfilter/nf_conntrack_ftp.h>
	45
	46	/* per conntrack: application helper private data */
	47	union nf_conntrack_help {
	48	/* insert conntrack helper private data (master) here */
	49	struct ip_ct_ftp_master ct_ftp_info;
	50	};
	51
	52	#include <linux/types.h>
	53	#include <linux/skbuff.h>
	54
	55	#ifdef CONFIG_NETFILTER_DEBUG
	56	#define NF_CT_ASSERT(x) \
	57	do { \
	58	if (!(x)) \
	59	/* Wooah! I'm tripping my conntrack in a frenzy of \
	60	netplay... */ \
	61	printk("NF_CT_ASSERT: %s:%i(%s)\n", \
	62	__FILE__, __LINE__, __FUNCTION__); \
	63	} while(0)
	64	#else
65	#define NF_CT_ASSERT(x)
66	#endif
67
68	struct nf_conntrack_helper;
69
dc808fe2 HW	70	/* nf_conn feature for connections that have a helper */
	71	struct nf_conn_help {
	72	/* Helper. if any */
	73	struct nf_conntrack_helper *helper;
	74
	75	union nf_conntrack_help help;
	76
	77	/* Current number of expected connections */
	78	unsigned int expecting;
	79	};
	80
	81
9fb9cbb1 YK	82	#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
	83	struct nf_conn
	84	{
	85	/* Usage count in here is 1 for hash table/destruct timer, 1 per skb,
	86	plus 1 for any connection(s) we are `master' for */
	87	struct nf_conntrack ct_general;
	88
	89	/* XXX should I move this to the tail ? - Y.K */
	90	/* These are my tuples; original and reply */
	91	struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
	92
	93	/* Have we seen traffic both ways yet? (bitset) */
	94	unsigned long status;
	95
dc808fe2 HW	96	/* If we were expected by an expectation, this will be it */
	97	struct nf_conn *master;
	98
9fb9cbb1 YK	99	/* Timer function; drops refcnt when it goes off. */
	100	struct timer_list timeout;
	101
	102	#ifdef CONFIG_NF_CT_ACCT
	103	/* Accounting Information (same cache line as other written members) */
	104	struct ip_conntrack_counter counters[IP_CT_DIR_MAX];
	105	#endif
9fb9cbb1	106
c1d10adb PNA	107	/* Unique ID that identifies this conntrack*/
	108	unsigned int id;
	109
9fb9cbb1 YK	110	/* features - nat, helper, ... used by allocating system */
	111	u_int32_t features;
	112
9fb9cbb1 YK	113	#if defined(CONFIG_NF_CONNTRACK_MARK)
	114	u_int32_t mark;
	115	#endif
	116
7c9728c3 JM	117	#ifdef CONFIG_NF_CONNTRACK_SECMARK
	118	u_int32_t secmark;
	119	#endif
	120
dc808fe2 HW	121	/* Storage reserved for other modules: */
dc808fe2 HW	122	union nf_conntrack_proto proto;
9fb9cbb1	123
dc808fe2 HW	124	/* features dynamically at the end: helper, nat (both optional) */
dc808fe2 HW	125	char data[0];
9fb9cbb1 YK	126	};
	127
	128	struct nf_conntrack_expect
	129	{
	130	/* Internal linked list (global expectation list) */
	131	struct list_head list;
	132
	133	/* We expect this tuple, with the following mask */
	134	struct nf_conntrack_tuple tuple, mask;
	135
	136	/* Function to call after setup and insertion */
	137	void (expectfn)(struct nf_conn new,
	138	struct nf_conntrack_expect *this);
	139
	140	/* The conntrack of the master connection */
	141	struct nf_conn *master;
	142
	143	/* Timer function; deletes the expectation. */
	144	struct timer_list timeout;
	145
	146	/* Usage count. */
	147	atomic_t use;
	148
c1d10adb PNA	149	/* Unique ID */
	150	unsigned int id;
	151
9fb9cbb1 YK	152	/* Flags */
	153	unsigned int flags;
	154
	155	#ifdef CONFIG_NF_NAT_NEEDED
	156	/* This is the original per-proto part, used to map the
	157	* expected connection the way the recipient expects. */
	158	union nf_conntrack_manip_proto saved_proto;
	159	/* Direction relative to the master connection. */
	160	enum ip_conntrack_dir dir;
	161	#endif
	162	};
	163
	164	#define NF_CT_EXPECT_PERMANENT 0x1
	165
	166	static inline struct nf_conn *
	167	nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash)
	168	{
	169	return container_of(hash, struct nf_conn,
	170	tuplehash[hash->tuple.dst.dir]);
	171	}
	172
	173	/* get master conntrack via master expectation */
	174	#define master_ct(conntr) (conntr->master)
	175
	176	/* Alter reply tuple (maybe alter helper). */
	177	extern void
	178	nf_conntrack_alter_reply(struct nf_conn *conntrack,
	179	const struct nf_conntrack_tuple *newreply);
	180
	181	/* Is this tuple taken? (ignoring any belonging to the given
	182	conntrack). */
	183	extern int
	184	nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
	185	const struct nf_conn *ignored_conntrack);
	186
	187	/* Return conntrack_info and tuple hash for given skb. */
	188	static inline struct nf_conn *
	189	nf_ct_get(const struct sk_buff skb, enum ip_conntrack_info ctinfo)
	190	{
	191	*ctinfo = skb->nfctinfo;
	192	return (struct nf_conn *)skb->nfct;
	193	}
	194
	195	/* decrement reference count on a conntrack */
	196	static inline void nf_ct_put(struct nf_conn *ct)
	197	{
	198	NF_CT_ASSERT(ct);
	199	nf_conntrack_put(&ct->ct_general);
	200	}
	201
b9f78f9f PNA	202	/* Protocol module loading */
	203	extern int nf_ct_l3proto_try_module_get(unsigned short l3proto);
	204	extern void nf_ct_l3proto_module_put(unsigned short l3proto);
	205
c1d10adb PNA	206	extern struct nf_conntrack_tuple_hash *
	207	__nf_conntrack_find(const struct nf_conntrack_tuple *tuple,
	208	const struct nf_conn *ignored_conntrack);
	209
	210	extern void nf_conntrack_hash_insert(struct nf_conn *ct);
	211
	212	extern struct nf_conntrack_expect *
	213	__nf_conntrack_expect_find(const struct nf_conntrack_tuple *tuple);
	214
	215	extern struct nf_conntrack_expect *
	216	nf_conntrack_expect_find(const struct nf_conntrack_tuple *tuple);
	217
	218	extern void nf_ct_unlink_expect(struct nf_conntrack_expect *exp);
	219
	220	extern void nf_ct_remove_expectations(struct nf_conn *ct);
	221
	222	extern void nf_conntrack_flush(void);
	223
	224	extern struct nf_conntrack_helper *
	225	nf_ct_helper_find_get( const struct nf_conntrack_tuple *tuple);
	226	extern void nf_ct_helper_put(struct nf_conntrack_helper *helper);
	227
	228	extern struct nf_conntrack_helper *
	229	__nf_conntrack_helper_find_byname(const char *name);
	230
9fb9cbb1 YK	231	extern int nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
	232	const struct nf_conntrack_tuple *orig);
	233
	234	extern void __nf_ct_refresh_acct(struct nf_conn *ct,
	235	enum ip_conntrack_info ctinfo,
	236	const struct sk_buff *skb,
	237	unsigned long extra_jiffies,
	238	int do_acct);
	239
	240	/* Refresh conntrack for this many jiffies and do accounting */
	241	static inline void nf_ct_refresh_acct(struct nf_conn *ct,
	242	enum ip_conntrack_info ctinfo,
	243	const struct sk_buff *skb,
	244	unsigned long extra_jiffies)
	245	{
	246	__nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
	247	}
	248
	249	/* Refresh conntrack for this many jiffies */
	250	static inline void nf_ct_refresh(struct nf_conn *ct,
	251	const struct sk_buff *skb,
	252	unsigned long extra_jiffies)
	253	{
	254	__nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
	255	}
	256
	257	/* These are for NAT. Icky. */
	258	/* Update TCP window tracking data when NAT mangles the packet */
	259	extern void nf_conntrack_tcp_update(struct sk_buff *skb,
	260	unsigned int dataoff,
	261	struct nf_conn *conntrack,
	262	int dir);
	263
	264	/* Call me when a conntrack is destroyed. */
	265	extern void (nf_conntrack_destroyed)(struct nf_conn conntrack);
	266
	267	/* Fake conntrack entry for untracked connections */
	268	extern struct nf_conn nf_conntrack_untracked;
	269
	270	extern int nf_ct_no_defrag;
	271
	272	/* Iterate over all conntracks: if iter returns true, it's deleted. */
	273	extern void
	274	nf_ct_iterate_cleanup(int (iter)(struct nf_conn i, void data), void data);
	275	extern void nf_conntrack_free(struct nf_conn *ct);
	276	extern struct nf_conn *
	277	nf_conntrack_alloc(const struct nf_conntrack_tuple *orig,
	278	const struct nf_conntrack_tuple *repl);
	279
	280	/* It's confirmed if it is, or has been in the hash table. */
	281	static inline int nf_ct_is_confirmed(struct nf_conn *ct)
	282	{
	283	return test_bit(IPS_CONFIRMED_BIT, &ct->status);
	284	}
	285
	286	static inline int nf_ct_is_dying(struct nf_conn *ct)
	287	{
	288	return test_bit(IPS_DYING_BIT, &ct->status);
	289	}
	290
	291	extern unsigned int nf_conntrack_htable_size;
39a27a35	292	extern int nf_conntrack_checksum;
9fb9cbb1 YK	293
	294	#define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++)
	295
	296	#ifdef CONFIG_NF_CONNTRACK_EVENTS
	297	#include <linux/notifier.h>
	298	#include <linux/interrupt.h>
	299
	300	struct nf_conntrack_ecache {
	301	struct nf_conn *ct;
	302	unsigned int events;
	303	};
	304	DECLARE_PER_CPU(struct nf_conntrack_ecache, nf_conntrack_ecache);
	305
	306	#define CONNTRACK_ECACHE(x) (__get_cpu_var(nf_conntrack_ecache).x)
	307
e041c683 AS	308	extern struct atomic_notifier_head nf_conntrack_chain;
e041c683 AS	309	extern struct atomic_notifier_head nf_conntrack_expect_chain;
9fb9cbb1 YK	310
	311	static inline int nf_conntrack_register_notifier(struct notifier_block *nb)
	312	{
e041c683	313	return atomic_notifier_chain_register(&nf_conntrack_chain, nb);
9fb9cbb1 YK	314	}
	315
	316	static inline int nf_conntrack_unregister_notifier(struct notifier_block *nb)
	317	{
e041c683	318	return atomic_notifier_chain_unregister(&nf_conntrack_chain, nb);
9fb9cbb1 YK	319	}
	320
	321	static inline int
	322	nf_conntrack_expect_register_notifier(struct notifier_block *nb)
	323	{
e041c683	324	return atomic_notifier_chain_register(&nf_conntrack_expect_chain, nb);
9fb9cbb1 YK	325	}
	326
	327	static inline int
	328	nf_conntrack_expect_unregister_notifier(struct notifier_block *nb)
	329	{
e041c683 AS	330	return atomic_notifier_chain_unregister(&nf_conntrack_expect_chain,
e041c683 AS	331	nb);
9fb9cbb1 YK	332	}
	333
	334	extern void nf_ct_deliver_cached_events(const struct nf_conn *ct);
	335	extern void __nf_ct_event_cache_init(struct nf_conn *ct);
	336
	337	static inline void
	338	nf_conntrack_event_cache(enum ip_conntrack_events event,
	339	const struct sk_buff *skb)
	340	{
	341	struct nf_conn ct = (struct nf_conn )skb->nfct;
	342	struct nf_conntrack_ecache *ecache;
	343
	344	local_bh_disable();
	345	ecache = &__get_cpu_var(nf_conntrack_ecache);
	346	if (ct != ecache->ct)
	347	__nf_ct_event_cache_init(ct);
	348	ecache->events \|= event;
	349	local_bh_enable();
	350	}
	351
	352	static inline void nf_conntrack_event(enum ip_conntrack_events event,
	353	struct nf_conn *ct)
	354	{
	355	if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct))
e041c683	356	atomic_notifier_call_chain(&nf_conntrack_chain, event, ct);
9fb9cbb1 YK	357	}
	358
	359	static inline void
	360	nf_conntrack_expect_event(enum ip_conntrack_expect_events event,
	361	struct nf_conntrack_expect *exp)
	362	{
e041c683	363	atomic_notifier_call_chain(&nf_conntrack_expect_chain, event, exp);
9fb9cbb1 YK	364	}
	365	#else /* CONFIG_NF_CONNTRACK_EVENTS */
	366	static inline void nf_conntrack_event_cache(enum ip_conntrack_events event,
	367	const struct sk_buff *skb) {}
	368	static inline void nf_conntrack_event(enum ip_conntrack_events event,
	369	struct nf_conn *ct) {}
	370	static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {}
	371	static inline void
	372	nf_conntrack_expect_event(enum ip_conntrack_expect_events event,
	373	struct nf_conntrack_expect *exp) {}
	374	#endif /* CONFIG_NF_CONNTRACK_EVENTS */
	375
	376	/* no helper, no nat */
	377	#define NF_CT_F_BASIC 0
	378	/* for helper */
	379	#define NF_CT_F_HELP 1
	380	/* for nat. */
	381	#define NF_CT_F_NAT 2
	382	#define NF_CT_F_NUM 4
	383
	384	extern int
dc808fe2	385	nf_conntrack_register_cache(u_int32_t features, const char *name, size_t size);
9fb9cbb1 YK	386	extern void
	387	nf_conntrack_unregister_cache(u_int32_t features);
	388
dc808fe2 HW	389	/* valid combinations:
	390	* basic: nf_conn, nf_conn .. nf_conn_help
	391	* nat: nf_conn .. nf_conn_nat, nf_conn .. nf_conn_nat, nf_conn help
	392	*/
	393	static inline struct nf_conn_help nfct_help(const struct nf_conn ct)
	394	{
	395	unsigned int offset = sizeof(struct nf_conn);
	396
	397	if (!(ct->features & NF_CT_F_HELP))
	398	return NULL;
	399
	400	return (struct nf_conn_help ) ((void )ct + offset);
	401	}
	402
9fb9cbb1 YK	403	#endif /* __KERNEL__ */
9fb9cbb1 YK	404	#endif /* _NF_CONNTRACK_H */