[net-next-2.6.git] / include / linux / netfilter_ipv4 / ip_conntrack.h

#ifndef _IP_CONNTRACK_H
#define _IP_CONNTRACK_H

#include <linux/netfilter/nf_conntrack_common.h>

#ifdef __KERNEL__
#include <linux/config.h>
#include <linux/netfilter_ipv4/ip_conntrack_tuple.h>
#include <linux/bitops.h>
#include <linux/compiler.h>
#include <asm/atomic.h>

#include <linux/netfilter_ipv4/ip_conntrack_tcp.h>
#include <linux/netfilter_ipv4/ip_conntrack_icmp.h>
#include <linux/netfilter_ipv4/ip_conntrack_proto_gre.h>
#include <linux/netfilter_ipv4/ip_conntrack_sctp.h>

/* per conntrack: protocol private data */
union ip_conntrack_proto {
	/* insert conntrack proto private data here */
	struct ip_ct_gre gre;
	struct ip_ct_sctp sctp;
	struct ip_ct_tcp tcp;
	struct ip_ct_icmp icmp;
};

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

/* Add protocol helper include file here */
#include <linux/netfilter_ipv4/ip_conntrack_pptp.h>
#include <linux/netfilter_ipv4/ip_conntrack_amanda.h>
#include <linux/netfilter_ipv4/ip_conntrack_ftp.h>
#include <linux/netfilter_ipv4/ip_conntrack_irc.h>

/* per conntrack: application helper private data */
union ip_conntrack_help {
	/* insert conntrack helper private data (master) here */
	struct ip_ct_pptp_master ct_pptp_info;
	struct ip_ct_ftp_master ct_ftp_info;
	struct ip_ct_irc_master ct_irc_info;
};

#ifdef CONFIG_IP_NF_NAT_NEEDED
#include <linux/netfilter_ipv4/ip_nat.h>
#include <linux/netfilter_ipv4/ip_nat_pptp.h>

/* per conntrack: nat application helper private data */
union ip_conntrack_nat_help {
	/* insert nat helper private data here */
	struct ip_nat_pptp nat_pptp_info;
};
#endif

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

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

struct ip_conntrack_helper;

struct ip_conntrack
{
	/* 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;

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

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

#ifdef CONFIG_IP_NF_CT_ACCT
	/* Accounting Information (same cache line as other written members) */
	struct ip_conntrack_counter counters[IP_CT_DIR_MAX];
#endif
	/* If we were expected by an expectation, this will be it */
	struct ip_conntrack *master;

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

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

	/* Helper, if any. */
	struct ip_conntrack_helper *helper;

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

	union ip_conntrack_help help;

#ifdef CONFIG_IP_NF_NAT_NEEDED
	struct {
		struct ip_nat_info info;
		union ip_conntrack_nat_help help;
#if defined(CONFIG_IP_NF_TARGET_MASQUERADE) || \
	defined(CONFIG_IP_NF_TARGET_MASQUERADE_MODULE)
		int masq_index;
#endif
	} nat;
#endif /* CONFIG_IP_NF_NAT_NEEDED */

#if defined(CONFIG_IP_NF_CONNTRACK_MARK)
	u_int32_t mark;
#endif

	/* Traversed often, so hopefully in different cacheline to top */
	/* These are my tuples; original and reply */
	struct ip_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
};

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

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

	/* The conntrack of the master connection */
	struct ip_conntrack *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_IP_NF_NAT_NEEDED
	/* This is the original per-proto part, used to map the
	 * expected connection the way the recipient expects. */
	union ip_conntrack_manip_proto saved_proto;
	/* Direction relative to the master connection. */
	enum ip_conntrack_dir dir;
#endif
};

#define IP_CT_EXPECT_PERMANENT	0x1

static inline struct ip_conntrack *
tuplehash_to_ctrack(const struct ip_conntrack_tuple_hash *hash)
{
	return container_of(hash, struct ip_conntrack,
			    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
ip_conntrack_alter_reply(struct ip_conntrack *conntrack,
			 const struct ip_conntrack_tuple *newreply);

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

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

/* decrement reference count on a conntrack */
static inline void
ip_conntrack_put(struct ip_conntrack *ct)
{
	IP_NF_ASSERT(ct);
	nf_conntrack_put(&ct->ct_general);
}

/* call to create an explicit dependency on ip_conntrack. */
extern void need_ip_conntrack(void);

extern int invert_tuplepr(struct ip_conntrack_tuple *inverse,
			  const struct ip_conntrack_tuple *orig);

extern void __ip_ct_refresh_acct(struct ip_conntrack *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 ip_ct_refresh_acct(struct ip_conntrack *ct, 
				      enum ip_conntrack_info ctinfo,
				      const struct sk_buff *skb,
				      unsigned long extra_jiffies)
{
	__ip_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
}

/* Refresh conntrack for this many jiffies */
static inline void ip_ct_refresh(struct ip_conntrack *ct,
				 const struct sk_buff *skb,
				 unsigned long extra_jiffies)
{
	__ip_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 ip_conntrack_tcp_update(struct sk_buff *skb,
				    struct ip_conntrack *conntrack,
				    enum ip_conntrack_dir dir);

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

/* Fake conntrack entry for untracked connections */
extern struct ip_conntrack ip_conntrack_untracked;

/* Returns new sk_buff, or NULL */
struct sk_buff *
ip_ct_gather_frags(struct sk_buff *skb, u_int32_t user);

/* Iterate over all conntracks: if iter returns true, it's deleted. */
extern void
ip_ct_iterate_cleanup(int (*iter)(struct ip_conntrack *i, void *data),
		      void *data);

extern struct ip_conntrack_helper *
__ip_conntrack_helper_find_byname(const char *);
extern struct ip_conntrack_helper *
ip_conntrack_helper_find_get(const struct ip_conntrack_tuple *tuple);
extern void ip_conntrack_helper_put(struct ip_conntrack_helper *helper);

extern struct ip_conntrack_protocol *
__ip_conntrack_proto_find(u_int8_t protocol);
extern struct ip_conntrack_protocol *
ip_conntrack_proto_find_get(u_int8_t protocol);
extern void ip_conntrack_proto_put(struct ip_conntrack_protocol *proto);

extern void ip_ct_remove_expectations(struct ip_conntrack *ct);

extern struct ip_conntrack *ip_conntrack_alloc(struct ip_conntrack_tuple *,
					       struct ip_conntrack_tuple *);

extern void ip_conntrack_free(struct ip_conntrack *ct);

extern void ip_conntrack_hash_insert(struct ip_conntrack *ct);

extern struct ip_conntrack_expect *
__ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple);

extern struct ip_conntrack_expect *
ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple);

extern struct ip_conntrack_tuple_hash *
__ip_conntrack_find(const struct ip_conntrack_tuple *tuple,
                    const struct ip_conntrack *ignored_conntrack);

extern void ip_conntrack_flush(void);

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

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

extern unsigned int ip_conntrack_htable_size;
 
#define CONNTRACK_STAT_INC(count) (__get_cpu_var(ip_conntrack_stat).count++)

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

struct ip_conntrack_ecache {
	struct ip_conntrack *ct;
	unsigned int events;
};
DECLARE_PER_CPU(struct ip_conntrack_ecache, ip_conntrack_ecache);

#define CONNTRACK_ECACHE(x)	(__get_cpu_var(ip_conntrack_ecache).x)
 
extern struct notifier_block *ip_conntrack_chain;
extern struct notifier_block *ip_conntrack_expect_chain;

static inline int ip_conntrack_register_notifier(struct notifier_block *nb)
{
	return notifier_chain_register(&ip_conntrack_chain, nb);
}

static inline int ip_conntrack_unregister_notifier(struct notifier_block *nb)
{
	return notifier_chain_unregister(&ip_conntrack_chain, nb);
}

static inline int 
ip_conntrack_expect_register_notifier(struct notifier_block *nb)
{
	return notifier_chain_register(&ip_conntrack_expect_chain, nb);
}

static inline int
ip_conntrack_expect_unregister_notifier(struct notifier_block *nb)
{
	return notifier_chain_unregister(&ip_conntrack_expect_chain, nb);
}

extern void ip_ct_deliver_cached_events(const struct ip_conntrack *ct);
extern void __ip_ct_event_cache_init(struct ip_conntrack *ct);

static inline void 
ip_conntrack_event_cache(enum ip_conntrack_events event,
			 const struct sk_buff *skb)
{
	struct ip_conntrack *ct = (struct ip_conntrack *)skb->nfct;
	struct ip_conntrack_ecache *ecache;
	
	local_bh_disable();
	ecache = &__get_cpu_var(ip_conntrack_ecache);
	if (ct != ecache->ct)
		__ip_ct_event_cache_init(ct);
	ecache->events |= event;
	local_bh_enable();
}

static inline void ip_conntrack_event(enum ip_conntrack_events event,
				      struct ip_conntrack *ct)
{
	if (is_confirmed(ct) && !is_dying(ct))
		notifier_call_chain(&ip_conntrack_chain, event, ct);
}

static inline void 
ip_conntrack_expect_event(enum ip_conntrack_expect_events event,
			  struct ip_conntrack_expect *exp)
{
	notifier_call_chain(&ip_conntrack_expect_chain, event, exp);
}
#else /* CONFIG_IP_NF_CONNTRACK_EVENTS */
static inline void ip_conntrack_event_cache(enum ip_conntrack_events event, 
					    const struct sk_buff *skb) {}
static inline void ip_conntrack_event(enum ip_conntrack_events event, 
				      struct ip_conntrack *ct) {}
static inline void ip_ct_deliver_cached_events(const struct ip_conntrack *ct) {}
static inline void 
ip_conntrack_expect_event(enum ip_conntrack_expect_events event, 
			  struct ip_conntrack_expect *exp) {}
#endif /* CONFIG_IP_NF_CONNTRACK_EVENTS */

#ifdef CONFIG_IP_NF_NAT_NEEDED
static inline int ip_nat_initialized(struct ip_conntrack *conntrack,
				     enum ip_nat_manip_type manip)
{
	if (manip == IP_NAT_MANIP_SRC)
		return test_bit(IPS_SRC_NAT_DONE_BIT, &conntrack->status);
	return test_bit(IPS_DST_NAT_DONE_BIT, &conntrack->status);
}
#endif /* CONFIG_IP_NF_NAT_NEEDED */

#endif /* __KERNEL__ */
#endif /* _IP_CONNTRACK_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _IP_CONNTRACK_H
1da177e4 LT	2	#define _IP_CONNTRACK_H
ac3247ba	3
9fb9cbb1	4	#include <linux/netfilter/nf_conntrack_common.h>
1da177e4 LT	5
	6	#ifdef __KERNEL__
	7	#include <linux/config.h>
	8	#include <linux/netfilter_ipv4/ip_conntrack_tuple.h>
	9	#include <linux/bitops.h>
	10	#include <linux/compiler.h>
	11	#include <asm/atomic.h>
	12
	13	#include <linux/netfilter_ipv4/ip_conntrack_tcp.h>
	14	#include <linux/netfilter_ipv4/ip_conntrack_icmp.h>
926b50f9	15	#include <linux/netfilter_ipv4/ip_conntrack_proto_gre.h>
1da177e4 LT	16	#include <linux/netfilter_ipv4/ip_conntrack_sctp.h>
	17
	18	/* per conntrack: protocol private data */
	19	union ip_conntrack_proto {
	20	/* insert conntrack proto private data here */
926b50f9	21	struct ip_ct_gre gre;
1da177e4 LT	22	struct ip_ct_sctp sctp;
	23	struct ip_ct_tcp tcp;
	24	struct ip_ct_icmp icmp;
	25	};
	26
	27	union ip_conntrack_expect_proto {
	28	/* insert expect proto private data here */
	29	};
	30
	31	/* Add protocol helper include file here */
926b50f9	32	#include <linux/netfilter_ipv4/ip_conntrack_pptp.h>
1da177e4 LT	33	#include <linux/netfilter_ipv4/ip_conntrack_amanda.h>
	34	#include <linux/netfilter_ipv4/ip_conntrack_ftp.h>
	35	#include <linux/netfilter_ipv4/ip_conntrack_irc.h>
	36
	37	/* per conntrack: application helper private data */
	38	union ip_conntrack_help {
	39	/* insert conntrack helper private data (master) here */
926b50f9	40	struct ip_ct_pptp_master ct_pptp_info;
1da177e4 LT	41	struct ip_ct_ftp_master ct_ftp_info;
	42	struct ip_ct_irc_master ct_irc_info;
	43	};
	44
	45	#ifdef CONFIG_IP_NF_NAT_NEEDED
	46	#include <linux/netfilter_ipv4/ip_nat.h>
926b50f9 HW	47	#include <linux/netfilter_ipv4/ip_nat_pptp.h>
	48
	49	/* per conntrack: nat application helper private data */
	50	union ip_conntrack_nat_help {
	51	/* insert nat helper private data here */
	52	struct ip_nat_pptp nat_pptp_info;
	53	};
1da177e4 LT	54	#endif
	55
	56	#include <linux/types.h>
	57	#include <linux/skbuff.h>
	58
	59	#ifdef CONFIG_NETFILTER_DEBUG
	60	#define IP_NF_ASSERT(x) \
	61	do { \
	62	if (!(x)) \
	63	/* Wooah! I'm tripping my conntrack in a frenzy of \
	64	netplay... */ \
	65	printk("NF_IP_ASSERT: %s:%i(%s)\n", \
	66	__FILE__, __LINE__, __FUNCTION__); \
	67	} while(0)
	68	#else
	69	#define IP_NF_ASSERT(x)
	70	#endif
	71
1da177e4 LT	72	struct ip_conntrack_helper;
	73
	74	struct ip_conntrack
	75	{
	76	/* Usage count in here is 1 for hash table/destruct timer, 1 per skb,
	77	plus 1 for any connection(s) we are `master' for */
	78	struct nf_conntrack ct_general;
	79
	80	/* Have we seen traffic both ways yet? (bitset) */
	81	unsigned long status;
	82
	83	/* Timer function; drops refcnt when it goes off. */
	84	struct timer_list timeout;
	85
	86	#ifdef CONFIG_IP_NF_CT_ACCT
	87	/* Accounting Information (same cache line as other written members) */
	88	struct ip_conntrack_counter counters[IP_CT_DIR_MAX];
	89	#endif
	90	/* If we were expected by an expectation, this will be it */
	91	struct ip_conntrack *master;
	92
	93	/* Current number of expected connections */
	94	unsigned int expecting;
	95
080774a2 HW	96	/* Unique ID that identifies this conntrack*/
	97	unsigned int id;
	98
1da177e4 LT	99	/* Helper, if any. */
	100	struct ip_conntrack_helper *helper;
	101
	102	/* Storage reserved for other modules: */
	103	union ip_conntrack_proto proto;
	104
	105	union ip_conntrack_help help;
	106
	107	#ifdef CONFIG_IP_NF_NAT_NEEDED
	108	struct {
	109	struct ip_nat_info info;
926b50f9	110	union ip_conntrack_nat_help help;
1da177e4 LT	111	#if defined(CONFIG_IP_NF_TARGET_MASQUERADE) \|\| \
	112	defined(CONFIG_IP_NF_TARGET_MASQUERADE_MODULE)
	113	int masq_index;
	114	#endif
	115	} nat;
	116	#endif /* CONFIG_IP_NF_NAT_NEEDED */
	117
	118	#if defined(CONFIG_IP_NF_CONNTRACK_MARK)
bf3a46aa	119	u_int32_t mark;
1da177e4 LT	120	#endif
	121
	122	/* Traversed often, so hopefully in different cacheline to top */
	123	/* These are my tuples; original and reply */
	124	struct ip_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
	125	};
	126
	127	struct ip_conntrack_expect
	128	{
	129	/* Internal linked list (global expectation list) */
	130	struct list_head list;
	131
	132	/* We expect this tuple, with the following mask */
	133	struct ip_conntrack_tuple tuple, mask;
	134
	135	/* Function to call after setup and insertion */
	136	void (expectfn)(struct ip_conntrack new,
	137	struct ip_conntrack_expect *this);
	138
	139	/* The conntrack of the master connection */
	140	struct ip_conntrack *master;
	141
	142	/* Timer function; deletes the expectation. */
	143	struct timer_list timeout;
	144
4acdbdbe RR	145	/* Usage count. */
	146	atomic_t use;
	147
080774a2 HW	148	/* Unique ID */
	149	unsigned int id;
	150
2248bcfc PM	151	/* Flags */
	152	unsigned int flags;
	153
1da177e4 LT	154	#ifdef CONFIG_IP_NF_NAT_NEEDED
	155	/* This is the original per-proto part, used to map the
	156	* expected connection the way the recipient expects. */
	157	union ip_conntrack_manip_proto saved_proto;
	158	/* Direction relative to the master connection. */
	159	enum ip_conntrack_dir dir;
	160	#endif
	161	};
	162
2248bcfc PM	163	#define IP_CT_EXPECT_PERMANENT 0x1
2248bcfc PM	164
1da177e4 LT	165	static inline struct ip_conntrack *
	166	tuplehash_to_ctrack(const struct ip_conntrack_tuple_hash *hash)
	167	{
	168	return container_of(hash, struct ip_conntrack,
	169	tuplehash[hash->tuple.dst.dir]);
	170	}
	171
	172	/* get master conntrack via master expectation */
	173	#define master_ct(conntr) (conntr->master)
	174
	175	/* Alter reply tuple (maybe alter helper). */
	176	extern void
	177	ip_conntrack_alter_reply(struct ip_conntrack *conntrack,
	178	const struct ip_conntrack_tuple *newreply);
	179
	180	/* Is this tuple taken? (ignoring any belonging to the given
	181	conntrack). */
	182	extern int
	183	ip_conntrack_tuple_taken(const struct ip_conntrack_tuple *tuple,
	184	const struct ip_conntrack *ignored_conntrack);
	185
	186	/* Return conntrack_info and tuple hash for given skb. */
	187	static inline struct ip_conntrack *
	188	ip_conntrack_get(const struct sk_buff skb, enum ip_conntrack_info ctinfo)
	189	{
	190	*ctinfo = skb->nfctinfo;
	191	return (struct ip_conntrack *)skb->nfct;
	192	}
	193
	194	/* decrement reference count on a conntrack */
080774a2 HW	195	static inline void
	196	ip_conntrack_put(struct ip_conntrack *ct)
	197	{
	198	IP_NF_ASSERT(ct);
	199	nf_conntrack_put(&ct->ct_general);
	200	}
1da177e4 LT	201
	202	/* call to create an explicit dependency on ip_conntrack. */
	203	extern void need_ip_conntrack(void);
	204
	205	extern int invert_tuplepr(struct ip_conntrack_tuple *inverse,
	206	const struct ip_conntrack_tuple *orig);
	207
1dfbab59 HW	208	extern void __ip_ct_refresh_acct(struct ip_conntrack *ct,
	209	enum ip_conntrack_info ctinfo,
	210	const struct sk_buff *skb,
	211	unsigned long extra_jiffies,
	212	int do_acct);
	213
	214	/* Refresh conntrack for this many jiffies and do accounting */
	215	static inline void ip_ct_refresh_acct(struct ip_conntrack *ct,
	216	enum ip_conntrack_info ctinfo,
	217	const struct sk_buff *skb,
	218	unsigned long extra_jiffies)
	219	{
	220	__ip_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
	221	}
	222
1da177e4	223	/* Refresh conntrack for this many jiffies */
1dfbab59 HW	224	static inline void ip_ct_refresh(struct ip_conntrack *ct,
	225	const struct sk_buff *skb,
	226	unsigned long extra_jiffies)
	227	{
	228	__ip_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
	229	}
1da177e4 LT	230
	231	/* These are for NAT. Icky. */
	232	/* Update TCP window tracking data when NAT mangles the packet */
	233	extern void ip_conntrack_tcp_update(struct sk_buff *skb,
	234	struct ip_conntrack *conntrack,
	235	enum ip_conntrack_dir dir);
	236
	237	/* Call me when a conntrack is destroyed. */
	238	extern void (ip_conntrack_destroyed)(struct ip_conntrack conntrack);
	239
	240	/* Fake conntrack entry for untracked connections */
	241	extern struct ip_conntrack ip_conntrack_untracked;
	242
	243	/* Returns new sk_buff, or NULL */
	244	struct sk_buff *
	245	ip_ct_gather_frags(struct sk_buff *skb, u_int32_t user);
	246
	247	/* Iterate over all conntracks: if iter returns true, it's deleted. */
	248	extern void
	249	ip_ct_iterate_cleanup(int (iter)(struct ip_conntrack i, void *data),
	250	void *data);
	251
080774a2 HW	252	extern struct ip_conntrack_helper *
	253	__ip_conntrack_helper_find_byname(const char *);
	254	extern struct ip_conntrack_helper *
	255	ip_conntrack_helper_find_get(const struct ip_conntrack_tuple *tuple);
	256	extern void ip_conntrack_helper_put(struct ip_conntrack_helper *helper);
	257
	258	extern struct ip_conntrack_protocol *
	259	__ip_conntrack_proto_find(u_int8_t protocol);
	260	extern struct ip_conntrack_protocol *
	261	ip_conntrack_proto_find_get(u_int8_t protocol);
	262	extern void ip_conntrack_proto_put(struct ip_conntrack_protocol *proto);
	263
	264	extern void ip_ct_remove_expectations(struct ip_conntrack *ct);
	265
	266	extern struct ip_conntrack ip_conntrack_alloc(struct ip_conntrack_tuple ,
	267	struct ip_conntrack_tuple *);
	268
	269	extern void ip_conntrack_free(struct ip_conntrack *ct);
	270
	271	extern void ip_conntrack_hash_insert(struct ip_conntrack *ct);
	272
	273	extern struct ip_conntrack_expect *
	274	__ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple);
	275
	276	extern struct ip_conntrack_expect *
a41bc002	277	ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple);
080774a2 HW	278
	279	extern struct ip_conntrack_tuple_hash *
	280	__ip_conntrack_find(const struct ip_conntrack_tuple *tuple,
	281	const struct ip_conntrack *ignored_conntrack);
	282
	283	extern void ip_conntrack_flush(void);
	284
1da177e4 LT	285	/* It's confirmed if it is, or has been in the hash table. */
	286	static inline int is_confirmed(struct ip_conntrack *ct)
	287	{
	288	return test_bit(IPS_CONFIRMED_BIT, &ct->status);
	289	}
	290
ac3247ba HW	291	static inline int is_dying(struct ip_conntrack *ct)
	292	{
	293	return test_bit(IPS_DYING_BIT, &ct->status);
	294	}
	295
1da177e4 LT	296	extern unsigned int ip_conntrack_htable_size;
1da177e4 LT	297
1da177e4 LT	298	#define CONNTRACK_STAT_INC(count) (__get_cpu_var(ip_conntrack_stat).count++)
1da177e4 LT	299
ac3247ba HW	300	#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
ac3247ba HW	301	#include <linux/notifier.h>
a86888b9	302	#include <linux/interrupt.h>
ac3247ba HW	303
	304	struct ip_conntrack_ecache {
	305	struct ip_conntrack *ct;
	306	unsigned int events;
	307	};
	308	DECLARE_PER_CPU(struct ip_conntrack_ecache, ip_conntrack_ecache);
	309
	310	#define CONNTRACK_ECACHE(x) (__get_cpu_var(ip_conntrack_ecache).x)
	311
	312	extern struct notifier_block *ip_conntrack_chain;
	313	extern struct notifier_block *ip_conntrack_expect_chain;
	314
	315	static inline int ip_conntrack_register_notifier(struct notifier_block *nb)
	316	{
	317	return notifier_chain_register(&ip_conntrack_chain, nb);
	318	}
	319
	320	static inline int ip_conntrack_unregister_notifier(struct notifier_block *nb)
	321	{
	322	return notifier_chain_unregister(&ip_conntrack_chain, nb);
	323	}
	324
	325	static inline int
	326	ip_conntrack_expect_register_notifier(struct notifier_block *nb)
	327	{
	328	return notifier_chain_register(&ip_conntrack_expect_chain, nb);
	329	}
	330
	331	static inline int
	332	ip_conntrack_expect_unregister_notifier(struct notifier_block *nb)
	333	{
	334	return notifier_chain_unregister(&ip_conntrack_expect_chain, nb);
	335	}
	336
a86888b9 PM	337	extern void ip_ct_deliver_cached_events(const struct ip_conntrack *ct);
	338	extern void __ip_ct_event_cache_init(struct ip_conntrack *ct);
	339
ac3247ba HW	340	static inline void
	341	ip_conntrack_event_cache(enum ip_conntrack_events event,
	342	const struct sk_buff *skb)
	343	{
a86888b9 PM	344	struct ip_conntrack ct = (struct ip_conntrack )skb->nfct;
	345	struct ip_conntrack_ecache *ecache;
	346
	347	local_bh_disable();
	348	ecache = &__get_cpu_var(ip_conntrack_ecache);
	349	if (ct != ecache->ct)
	350	__ip_ct_event_cache_init(ct);
ac3247ba	351	ecache->events \|= event;
a86888b9	352	local_bh_enable();
ac3247ba HW	353	}
ac3247ba HW	354
ac3247ba HW	355	static inline void ip_conntrack_event(enum ip_conntrack_events event,
	356	struct ip_conntrack *ct)
	357	{
	358	if (is_confirmed(ct) && !is_dying(ct))
	359	notifier_call_chain(&ip_conntrack_chain, event, ct);
	360	}
	361
	362	static inline void
	363	ip_conntrack_expect_event(enum ip_conntrack_expect_events event,
	364	struct ip_conntrack_expect *exp)
	365	{
	366	notifier_call_chain(&ip_conntrack_expect_chain, event, exp);
	367	}
	368	#else /* CONFIG_IP_NF_CONNTRACK_EVENTS */
	369	static inline void ip_conntrack_event_cache(enum ip_conntrack_events event,
	370	const struct sk_buff *skb) {}
	371	static inline void ip_conntrack_event(enum ip_conntrack_events event,
	372	struct ip_conntrack *ct) {}
a86888b9	373	static inline void ip_ct_deliver_cached_events(const struct ip_conntrack *ct) {}
ac3247ba HW	374	static inline void
	375	ip_conntrack_expect_event(enum ip_conntrack_expect_events event,
	376	struct ip_conntrack_expect *exp) {}
	377	#endif /* CONFIG_IP_NF_CONNTRACK_EVENTS */
	378
1da177e4 LT	379	#ifdef CONFIG_IP_NF_NAT_NEEDED
	380	static inline int ip_nat_initialized(struct ip_conntrack *conntrack,
	381	enum ip_nat_manip_type manip)
	382	{
	383	if (manip == IP_NAT_MANIP_SRC)
	384	return test_bit(IPS_SRC_NAT_DONE_BIT, &conntrack->status);
	385	return test_bit(IPS_DST_NAT_DONE_BIT, &conntrack->status);
	386	}
	387	#endif /* CONFIG_IP_NF_NAT_NEEDED */
	388
	389	#endif /* __KERNEL__ */
	390	#endif /* _IP_CONNTRACK_H */