[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>

#include <linux/bitops.h>
#include <linux/compiler.h>
#include <linux/atomic.h>
#include <linux/rhashtable.h>

#include <linux/netfilter/nf_conntrack_tcp.h>
#include <linux/netfilter/nf_conntrack_dccp.h>
#include <linux/netfilter/nf_conntrack_sctp.h>
#include <linux/netfilter/nf_conntrack_proto_gre.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 nf_ct_dccp dccp;
	struct ip_ct_sctp sctp;
	struct ip_ct_tcp tcp;
	struct nf_ct_gre gre;
};

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

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

#ifdef CONFIG_NETFILTER_DEBUG
#define NF_CT_ASSERT(x)		WARN_ON(!(x))
#else
#define NF_CT_ASSERT(x)
#endif

struct nf_conntrack_helper;

/* Must be kept in sync with the classes defined by helpers */
#define NF_CT_MAX_EXPECT_CLASSES	4

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

	struct hlist_head expectations;

	/* Current number of expected connections */
	u8 expecting[NF_CT_MAX_EXPECT_CLASSES];

	/* private helper information. */
	char data[];
};

#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, 1 per skb,
	 * plus 1 for any connection(s) we are `master' for
	 *
	 * Hint, SKB address this struct and refcnt via skb->nfct and
	 * helpers nf_conntrack_get() and nf_conntrack_put().
	 * Helper nf_ct_put() equals nf_conntrack_put() by dec refcnt,
	 * beware nf_ct_get() is different and don't inc refcnt.
	 */
	struct nf_conntrack ct_general;

	spinlock_t	lock;
	u16		cpu;

#ifdef CONFIG_NF_CONNTRACK_ZONES
	struct nf_conntrack_zone zone;
#endif
	/* 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;

	/* jiffies32 when this ct is considered dead */
	u32 timeout;

	possible_net_t ct_net;

	/* all members below initialized via memset */
	u8 __nfct_init_offset[0];

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

#if defined(CONFIG_NF_CONNTRACK_MARK)
	u_int32_t mark;
#endif

#ifdef CONFIG_NF_CONNTRACK_SECMARK
	u_int32_t secmark;
#endif

	/* Extensions */
	struct nf_ct_ext *ext;

#if IS_ENABLED(CONFIG_NF_NAT)
	struct rhash_head	nat_bysource;
#endif
	/* Storage reserved for other modules, must be the last member */
	union nf_conntrack_proto proto;
};

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]);
}

static inline u_int16_t nf_ct_l3num(const struct nf_conn *ct)
{
	return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
}

static inline u_int8_t nf_ct_protonum(const struct nf_conn *ct)
{
	return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
}

#define nf_ct_tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)

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

extern struct net init_net;

static inline struct net *nf_ct_net(const struct nf_conn *ct)
{
	return read_pnet(&ct->ct_net);
}

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

/* Is this tuple taken? (ignoring any belonging to the given
   conntrack). */
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 */
int nf_ct_l3proto_try_module_get(unsigned short l3proto);
void nf_ct_l3proto_module_put(unsigned short l3proto);

/*
 * Allocate a hashtable of hlist_head (if nulls == 0),
 * or hlist_nulls_head (if nulls == 1)
 */
void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls);

void nf_ct_free_hashtable(void *hash, unsigned int size);

int nf_conntrack_hash_check_insert(struct nf_conn *ct);
bool nf_ct_delete(struct nf_conn *ct, u32 pid, int report);

bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff,
		       u_int16_t l3num, struct net *net,
		       struct nf_conntrack_tuple *tuple);
bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
			  const struct nf_conntrack_tuple *orig);

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);
}

/* kill conntrack and do accounting */
bool nf_ct_kill_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
		     const struct sk_buff *skb);

/* kill conntrack without accounting */
static inline bool nf_ct_kill(struct nf_conn *ct)
{
	return nf_ct_delete(ct, 0, 0);
}

/* These are for NAT.  Icky. */
extern s32 (*nf_ct_nat_offset)(const struct nf_conn *ct,
			       enum ip_conntrack_dir dir,
			       u32 seq);

/* Fake conntrack entry for untracked connections */
DECLARE_PER_CPU(struct nf_conn, nf_conntrack_untracked);
static inline struct nf_conn *nf_ct_untracked_get(void)
{
	return raw_cpu_ptr(&nf_conntrack_untracked);
}
void nf_ct_untracked_status_or(unsigned long bits);

/* Iterate over all conntracks: if iter returns true, it's deleted. */
void nf_ct_iterate_cleanup(struct net *net,
			   int (*iter)(struct nf_conn *i, void *data),
			   void *data, u32 portid, int report);

struct nf_conntrack_zone;

void nf_conntrack_free(struct nf_conn *ct);
struct nf_conn *nf_conntrack_alloc(struct net *net,
				   const struct nf_conntrack_zone *zone,
				   const struct nf_conntrack_tuple *orig,
				   const struct nf_conntrack_tuple *repl,
				   gfp_t gfp);

static inline int nf_ct_is_template(const struct nf_conn *ct)
{
	return test_bit(IPS_TEMPLATE_BIT, &ct->status);
}

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

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

static inline int nf_ct_is_untracked(const struct nf_conn *ct)
{
	return test_bit(IPS_UNTRACKED_BIT, &ct->status);
}

/* Packet is received from loopback */
static inline bool nf_is_loopback_packet(const struct sk_buff *skb)
{
	return skb->dev && skb->skb_iif && skb->dev->flags & IFF_LOOPBACK;
}

#define nfct_time_stamp ((u32)(jiffies))

/* jiffies until ct expires, 0 if already expired */
static inline unsigned long nf_ct_expires(const struct nf_conn *ct)
{
	s32 timeout = ct->timeout - nfct_time_stamp;

	return timeout > 0 ? timeout : 0;
}

static inline bool nf_ct_is_expired(const struct nf_conn *ct)
{
	return (__s32)(ct->timeout - nfct_time_stamp) <= 0;
}

/* use after obtaining a reference count */
static inline bool nf_ct_should_gc(const struct nf_conn *ct)
{
	return nf_ct_is_expired(ct) && nf_ct_is_confirmed(ct) &&
	       !nf_ct_is_dying(ct);
}

struct kernel_param;

int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp);
int nf_conntrack_hash_resize(unsigned int hashsize);

extern struct hlist_nulls_head *nf_conntrack_hash;
extern unsigned int nf_conntrack_htable_size;
extern seqcount_t nf_conntrack_generation;
extern unsigned int nf_conntrack_max;

/* must be called with rcu read lock held */
static inline void
nf_conntrack_get_ht(struct hlist_nulls_head **hash, unsigned int *hsize)
{
	struct hlist_nulls_head *hptr;
	unsigned int sequence, hsz;

	do {
		sequence = read_seqcount_begin(&nf_conntrack_generation);
		hsz = nf_conntrack_htable_size;
		hptr = nf_conntrack_hash;
	} while (read_seqcount_retry(&nf_conntrack_generation, sequence));

	*hash = hptr;
	*hsize = hsz;
}

struct nf_conn *nf_ct_tmpl_alloc(struct net *net,
				 const struct nf_conntrack_zone *zone,
				 gfp_t flags);
void nf_ct_tmpl_free(struct nf_conn *tmpl);

#define NF_CT_STAT_INC(net, count)	  __this_cpu_inc((net)->ct.stat->count)
#define NF_CT_STAT_INC_ATOMIC(net, count) this_cpu_inc((net)->ct.stat->count)
#define NF_CT_STAT_ADD_ATOMIC(net, count, v) this_cpu_add((net)->ct.stat->count, (v))

#define MODULE_ALIAS_NFCT_HELPER(helper) \
        MODULE_ALIAS("nfct-helper-" helper)

#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
9fb9cbb1 YK	17	#include <linux/bitops.h>
9fb9cbb1 YK	18	#include <linux/compiler.h>
60063497	19	#include <linux/atomic.h>
870190a9	20	#include <linux/rhashtable.h>
9fb9cbb1 YK	21
9fb9cbb1 YK	22	#include <linux/netfilter/nf_conntrack_tcp.h>
2bc78049	23	#include <linux/netfilter/nf_conntrack_dccp.h>
9fb9cbb1	24	#include <linux/netfilter/nf_conntrack_sctp.h>
f09943fe	25	#include <linux/netfilter/nf_conntrack_proto_gre.h>
9fb9cbb1 YK	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 */
2bc78049	33	struct nf_ct_dccp dccp;
9fb9cbb1 YK	34	struct ip_ct_sctp sctp;
9fb9cbb1 YK	35	struct ip_ct_tcp tcp;
f09943fe	36	struct nf_ct_gre gre;
9fb9cbb1 YK	37	};
	38
	39	union nf_conntrack_expect_proto {
	40	/* insert expect proto private data here */
	41	};
	42
9fb9cbb1 YK	43	#include <linux/types.h>
	44	#include <linux/skbuff.h>
	45
	46	#ifdef CONFIG_NETFILTER_DEBUG
55871d04	47	#define NF_CT_ASSERT(x) WARN_ON(!(x))
9fb9cbb1 YK	48	#else
	49	#define NF_CT_ASSERT(x)
	50	#endif
	51
	52	struct nf_conntrack_helper;
	53
6002f266	54	/* Must be kept in sync with the classes defined by helpers */
9d288dff	55	#define NF_CT_MAX_EXPECT_CLASSES 4
6002f266	56
dc808fe2 HW	57	/* nf_conn feature for connections that have a helper */
	58	struct nf_conn_help {
	59	/* Helper. if any */
0906a372	60	struct nf_conntrack_helper __rcu *helper;
dc808fe2	61
b560580a PM	62	struct hlist_head expectations;
b560580a PM	63
dc808fe2	64	/* Current number of expected connections */
6002f266	65	u8 expecting[NF_CT_MAX_EXPECT_CLASSES];
1afc5679 PNA	66
	67	/* private helper information. */
	68	char data[];
dc808fe2 HW	69	};
dc808fe2 HW	70
9fb9cbb1	71	#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
f8eb24a8 PM	72	#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
f8eb24a8 PM	73
ea781f19	74	struct nf_conn {
f330a7fd	75	/* Usage count in here is 1 for hash table, 1 per skb,
b476b72a JDB	76	* plus 1 for any connection(s) we are `master' for
	77	*
	78	* Hint, SKB address this struct and refcnt via skb->nfct and
	79	* helpers nf_conntrack_get() and nf_conntrack_put().
	80	* Helper nf_ct_put() equals nf_conntrack_put() by dec refcnt,
	81	* beware nf_ct_get() is different and don't inc refcnt.
	82	*/
9fb9cbb1 YK	83	struct nf_conntrack ct_general;
9fb9cbb1 YK	84
b7779d06 JDB	85	spinlock_t lock;
b7779d06 JDB	86	u16 cpu;
440f0d58	87
6c8dee98 FW	88	#ifdef CONFIG_NF_CONNTRACK_ZONES
	89	struct nf_conntrack_zone zone;
	90	#endif
9fb9cbb1 YK	91	/* XXX should I move this to the tail ? - Y.K */
	92	/* These are my tuples; original and reply */
	93	struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
	94
	95	/* Have we seen traffic both ways yet? (bitset) */
	96	unsigned long status;
	97
f330a7fd FW	98	/* jiffies32 when this ct is considered dead */
f330a7fd FW	99	u32 timeout;
9fb9cbb1	100
0c5c9fb5 EB	101	possible_net_t ct_net;
0c5c9fb5 EB	102
c41884ce FW	103	/* all members below initialized via memset */
	104	u8 __nfct_init_offset[0];
	105
	106	/* If we were expected by an expectation, this will be it */
	107	struct nf_conn *master;
	108
9fb9cbb1 YK	109	#if defined(CONFIG_NF_CONNTRACK_MARK)
	110	u_int32_t mark;
	111	#endif
	112
7c9728c3 JM	113	#ifdef CONFIG_NF_CONNTRACK_SECMARK
	114	u_int32_t secmark;
	115	#endif
	116
ecfab2c9 YK	117	/* Extensions */
ecfab2c9 YK	118	struct nf_ct_ext *ext;
e5fc9e7a	119
7c966435	120	#if IS_ENABLED(CONFIG_NF_NAT)
870190a9	121	struct rhash_head nat_bysource;
7c966435	122	#endif
e5fc9e7a CG	123	/* Storage reserved for other modules, must be the last member */
e5fc9e7a CG	124	union nf_conntrack_proto proto;
9fb9cbb1 YK	125	};
9fb9cbb1 YK	126
9fb9cbb1 YK	127	static inline struct nf_conn *
	128	nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash)
	129	{
	130	return container_of(hash, struct nf_conn,
	131	tuplehash[hash->tuple.dst.dir]);
	132	}
	133
5e8fbe2a PM	134	static inline u_int16_t nf_ct_l3num(const struct nf_conn *ct)
	135	{
	136	return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
	137	}
	138
	139	static inline u_int8_t nf_ct_protonum(const struct nf_conn *ct)
	140	{
	141	return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
	142	}
	143
f2f3e38c PNA	144	#define nf_ct_tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
f2f3e38c PNA	145
9fb9cbb1 YK	146	/* get master conntrack via master expectation */
	147	#define master_ct(conntr) (conntr->master)
	148
5a1fb391 AD	149	extern struct net init_net;
	150
	151	static inline struct net nf_ct_net(const struct nf_conn ct)
	152	{
c2d9ba9b	153	return read_pnet(&ct->ct_net);
5a1fb391 AD	154	}
5a1fb391 AD	155
9fb9cbb1	156	/* Alter reply tuple (maybe alter helper). */
4e77be46 JP	157	void nf_conntrack_alter_reply(struct nf_conn *ct,
4e77be46 JP	158	const struct nf_conntrack_tuple *newreply);
9fb9cbb1 YK	159
	160	/* Is this tuple taken? (ignoring any belonging to the given
	161	conntrack). */
4e77be46 JP	162	int nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
4e77be46 JP	163	const struct nf_conn *ignored_conntrack);
9fb9cbb1 YK	164
	165	/* Return conntrack_info and tuple hash for given skb. */
	166	static inline struct nf_conn *
	167	nf_ct_get(const struct sk_buff skb, enum ip_conntrack_info ctinfo)
	168	{
	169	*ctinfo = skb->nfctinfo;
	170	return (struct nf_conn *)skb->nfct;
	171	}
	172
	173	/* decrement reference count on a conntrack */
	174	static inline void nf_ct_put(struct nf_conn *ct)
	175	{
	176	NF_CT_ASSERT(ct);
	177	nf_conntrack_put(&ct->ct_general);
	178	}
	179
b9f78f9f	180	/* Protocol module loading */
4e77be46 JP	181	int nf_ct_l3proto_try_module_get(unsigned short l3proto);
4e77be46 JP	182	void nf_ct_l3proto_module_put(unsigned short l3proto);
b9f78f9f	183
ea781f19 ED	184	/*
	185	* Allocate a hashtable of hlist_head (if nulls == 0),
	186	* or hlist_nulls_head (if nulls == 1)
	187	*/
4e77be46	188	void nf_ct_alloc_hashtable(unsigned int sizep, int nulls);
ea781f19	189
4e77be46	190	void nf_ct_free_hashtable(void *hash, unsigned int size);
ac565e5f	191
4e77be46	192	int nf_conntrack_hash_check_insert(struct nf_conn *ct);
02982c27	193	bool nf_ct_delete(struct nf_conn *ct, u32 pid, int report);
c1d10adb	194
4e77be46	195	bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff,
a31f1adc EB	196	u_int16_t l3num, struct net *net,
a31f1adc EB	197	struct nf_conntrack_tuple *tuple);
4e77be46 JP	198	bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
4e77be46 JP	199	const struct nf_conntrack_tuple *orig);
9fb9cbb1	200
4e77be46 JP	201	void __nf_ct_refresh_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
	202	const struct sk_buff *skb,
	203	unsigned long extra_jiffies, int do_acct);
9fb9cbb1 YK	204
	205	/* Refresh conntrack for this many jiffies and do accounting */
	206	static inline void nf_ct_refresh_acct(struct nf_conn *ct,
	207	enum ip_conntrack_info ctinfo,
	208	const struct sk_buff *skb,
	209	unsigned long extra_jiffies)
	210	{
	211	__nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
	212	}
	213
	214	/* Refresh conntrack for this many jiffies */
	215	static inline void nf_ct_refresh(struct nf_conn *ct,
	216	const struct sk_buff *skb,
	217	unsigned long extra_jiffies)
	218	{
	219	__nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
	220	}
	221
718d4ad9	222	/* kill conntrack and do accounting */
ad66713f FW	223	bool nf_ct_kill_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
ad66713f FW	224	const struct sk_buff *skb);
718d4ad9 FH	225
718d4ad9 FH	226	/* kill conntrack without accounting */
4c889498	227	static inline bool nf_ct_kill(struct nf_conn *ct)
718d4ad9	228	{
ad66713f	229	return nf_ct_delete(ct, 0, 0);
718d4ad9	230	}
51091764	231
9fb9cbb1	232	/* These are for NAT. Icky. */
2d89c68a	233	extern s32 (nf_ct_nat_offset)(const struct nf_conn ct,
f9dd09c7 JK	234	enum ip_conntrack_dir dir,
f9dd09c7 JK	235	u32 seq);
9fb9cbb1	236
9fb9cbb1	237	/* Fake conntrack entry for untracked connections */
b3c5163f	238	DECLARE_PER_CPU(struct nf_conn, nf_conntrack_untracked);
5bfddbd4 ED	239	static inline struct nf_conn *nf_ct_untracked_get(void)
5bfddbd4 ED	240	{
903ceff7	241	return raw_cpu_ptr(&nf_conntrack_untracked);
5bfddbd4	242	}
4e77be46	243	void nf_ct_untracked_status_or(unsigned long bits);
9fb9cbb1	244
9fb9cbb1	245	/* Iterate over all conntracks: if iter returns true, it's deleted. */
4e77be46 JP	246	void nf_ct_iterate_cleanup(struct net *net,
	247	int (iter)(struct nf_conn i, void *data),
	248	void *data, u32 portid, int report);
308ac914 DB	249
	250	struct nf_conntrack_zone;
	251
4e77be46	252	void nf_conntrack_free(struct nf_conn *ct);
308ac914 DB	253	struct nf_conn nf_conntrack_alloc(struct net net,
308ac914 DB	254	const struct nf_conntrack_zone *zone,
4e77be46 JP	255	const struct nf_conntrack_tuple *orig,
	256	const struct nf_conntrack_tuple *repl,
	257	gfp_t gfp);
9fb9cbb1	258
b2a15a60 PM	259	static inline int nf_ct_is_template(const struct nf_conn *ct)
	260	{
	261	return test_bit(IPS_TEMPLATE_BIT, &ct->status);
	262	}
	263
9fb9cbb1	264	/* It's confirmed if it is, or has been in the hash table. */
d51ed836	265	static inline int nf_ct_is_confirmed(const struct nf_conn *ct)
9fb9cbb1 YK	266	{
	267	return test_bit(IPS_CONFIRMED_BIT, &ct->status);
	268	}
	269
d51ed836	270	static inline int nf_ct_is_dying(const struct nf_conn *ct)
9fb9cbb1 YK	271	{
	272	return test_bit(IPS_DYING_BIT, &ct->status);
	273	}
	274
5bfddbd4	275	static inline int nf_ct_is_untracked(const struct nf_conn *ct)
587aa641	276	{
5bfddbd4	277	return test_bit(IPS_UNTRACKED_BIT, &ct->status);
587aa641 PM	278	}
587aa641 PM	279
42c1edd3 JA	280	/* Packet is received from loopback */
	281	static inline bool nf_is_loopback_packet(const struct sk_buff *skb)
	282	{
	283	return skb->dev && skb->skb_iif && skb->dev->flags & IFF_LOOPBACK;
	284	}
	285
f330a7fd FW	286	#define nfct_time_stamp ((u32)(jiffies))
f330a7fd FW	287
c8607e02 FW	288	/* jiffies until ct expires, 0 if already expired */
	289	static inline unsigned long nf_ct_expires(const struct nf_conn *ct)
	290	{
f330a7fd	291	s32 timeout = ct->timeout - nfct_time_stamp;
c8607e02 FW	292
	293	return timeout > 0 ? timeout : 0;
	294	}
	295
f330a7fd FW	296	static inline bool nf_ct_is_expired(const struct nf_conn *ct)
	297	{
	298	return (__s32)(ct->timeout - nfct_time_stamp) <= 0;
	299	}
	300
	301	/* use after obtaining a reference count */
	302	static inline bool nf_ct_should_gc(const struct nf_conn *ct)
	303	{
	304	return nf_ct_is_expired(ct) && nf_ct_is_confirmed(ct) &&
	305	!nf_ct_is_dying(ct);
	306	}
	307
34641c6d PG	308	struct kernel_param;
34641c6d PG	309
4e77be46	310	int nf_conntrack_set_hashsize(const char val, struct kernel_param kp);
3183ab89	311	int nf_conntrack_hash_resize(unsigned int hashsize);
92e47ba8 LZ	312
92e47ba8 LZ	313	extern struct hlist_nulls_head *nf_conntrack_hash;
9fb9cbb1	314	extern unsigned int nf_conntrack_htable_size;
92e47ba8	315	extern seqcount_t nf_conntrack_generation;
e478075c	316	extern unsigned int nf_conntrack_max;
9fb9cbb1	317
92e47ba8 LZ	318	/* must be called with rcu read lock held */
	319	static inline void
	320	nf_conntrack_get_ht(struct hlist_nulls_head *hash, unsigned int hsize)
	321	{
	322	struct hlist_nulls_head *hptr;
	323	unsigned int sequence, hsz;
	324
	325	do {
	326	sequence = read_seqcount_begin(&nf_conntrack_generation);
	327	hsz = nf_conntrack_htable_size;
	328	hptr = nf_conntrack_hash;
	329	} while (read_seqcount_retry(&nf_conntrack_generation, sequence));
	330
	331	*hash = hptr;
	332	*hsize = hsz;
	333	}
	334
308ac914 DB	335	struct nf_conn nf_ct_tmpl_alloc(struct net net,
	336	const struct nf_conntrack_zone *zone,
	337	gfp_t flags);
9cf94eab	338	void nf_ct_tmpl_free(struct nf_conn *tmpl);
e53376be	339
ac3a546a ED	340	#define NF_CT_STAT_INC(net, count) __this_cpu_inc((net)->ct.stat->count)
ac3a546a ED	341	#define NF_CT_STAT_INC_ATOMIC(net, count) this_cpu_inc((net)->ct.stat->count)
242922a0	342	#define NF_CT_STAT_ADD_ATOMIC(net, count, v) this_cpu_add((net)->ct.stat->count, (v))
9fb9cbb1	343
4dc06f96 PNA	344	#define MODULE_ALIAS_NFCT_HELPER(helper) \
	345	MODULE_ALIAS("nfct-helper-" helper)
	346
9fb9cbb1	347	#endif /* _NF_CONNTRACK_H */