[mirror_ubuntu-zesty-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>

#include <linux/bitops.h>
#include <linux/compiler.h>
#include <linux/atomic.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>
#include <linux/timer.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/destruct timer, 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;

	/* 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;

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

	/* 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);

struct nf_conntrack_tuple_hash *
__nf_conntrack_find(struct net *net, u16 zone,
		    const struct nf_conntrack_tuple *tuple);

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 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);
}

bool __nf_ct_kill_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
		       const struct sk_buff *skb, int do_acct);

/* kill conntrack and do accounting */
static inline bool nf_ct_kill_acct(struct nf_conn *ct,
				   enum ip_conntrack_info ctinfo,
				   const struct sk_buff *skb)
{
	return __nf_ct_kill_acct(ct, ctinfo, skb, 1);
}

/* kill conntrack without accounting */
static inline bool nf_ct_kill(struct nf_conn *ct)
{
	return __nf_ct_kill_acct(ct, 0, NULL, 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);
void nf_conntrack_free(struct nf_conn *ct);
struct nf_conn *nf_conntrack_alloc(struct net *net, u16 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(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);
}

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;
}

struct kernel_param;

int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp);
extern unsigned int nf_conntrack_htable_size;
extern unsigned int nf_conntrack_max;
extern unsigned int nf_conntrack_hash_rnd;
void init_nf_conntrack_hash_rnd(void);

struct nf_conn *nf_ct_tmpl_alloc(struct net *net, u16 zone, gfp_t flags);

#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 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>
9fb9cbb1 YK	20
9fb9cbb1 YK	21	#include <linux/netfilter/nf_conntrack_tcp.h>
2bc78049	22	#include <linux/netfilter/nf_conntrack_dccp.h>
9fb9cbb1	23	#include <linux/netfilter/nf_conntrack_sctp.h>
f09943fe	24	#include <linux/netfilter/nf_conntrack_proto_gre.h>
9fb9cbb1 YK	25	#include <net/netfilter/ipv6/nf_conntrack_icmpv6.h>
	26
	27	#include <net/netfilter/nf_conntrack_tuple.h>
	28
	29	/* per conntrack: protocol private data */
	30	union nf_conntrack_proto {
	31	/* insert conntrack proto private data here */
2bc78049	32	struct nf_ct_dccp dccp;
9fb9cbb1 YK	33	struct ip_ct_sctp sctp;
9fb9cbb1 YK	34	struct ip_ct_tcp tcp;
f09943fe	35	struct nf_ct_gre gre;
9fb9cbb1 YK	36	};
	37
	38	union nf_conntrack_expect_proto {
	39	/* insert expect proto private data here */
	40	};
	41
9fb9cbb1 YK	42	#include <linux/types.h>
9fb9cbb1 YK	43	#include <linux/skbuff.h>
d7fe0f24	44	#include <linux/timer.h>
9fb9cbb1 YK	45
9fb9cbb1 YK	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 {
9fb9cbb1	75	/* Usage count in here is 1 for hash table/destruct timer, 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
9fb9cbb1 YK	88	/* XXX should I move this to the tail ? - Y.K */
	89	/* These are my tuples; original and reply */
	90	struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
	91
	92	/* Have we seen traffic both ways yet? (bitset) */
	93	unsigned long status;
	94
	95	/* Timer function; drops refcnt when it goes off. */
	96	struct timer_list timeout;
	97
0c5c9fb5 EB	98	possible_net_t ct_net;
0c5c9fb5 EB	99
c41884ce FW	100	/* all members below initialized via memset */
	101	u8 __nfct_init_offset[0];
	102
	103	/* If we were expected by an expectation, this will be it */
	104	struct nf_conn *master;
	105
9fb9cbb1 YK	106	#if defined(CONFIG_NF_CONNTRACK_MARK)
	107	u_int32_t mark;
	108	#endif
	109
7c9728c3 JM	110	#ifdef CONFIG_NF_CONNTRACK_SECMARK
	111	u_int32_t secmark;
	112	#endif
	113
ecfab2c9 YK	114	/* Extensions */
ecfab2c9 YK	115	struct nf_ct_ext *ext;
e5fc9e7a CG	116
	117	/* Storage reserved for other modules, must be the last member */
	118	union nf_conntrack_proto proto;
9fb9cbb1 YK	119	};
9fb9cbb1 YK	120
9fb9cbb1 YK	121	static inline struct nf_conn *
	122	nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash)
	123	{
	124	return container_of(hash, struct nf_conn,
	125	tuplehash[hash->tuple.dst.dir]);
	126	}
	127
5e8fbe2a PM	128	static inline u_int16_t nf_ct_l3num(const struct nf_conn *ct)
	129	{
	130	return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
	131	}
	132
	133	static inline u_int8_t nf_ct_protonum(const struct nf_conn *ct)
	134	{
	135	return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
	136	}
	137
f2f3e38c PNA	138	#define nf_ct_tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
f2f3e38c PNA	139
9fb9cbb1 YK	140	/* get master conntrack via master expectation */
	141	#define master_ct(conntr) (conntr->master)
	142
5a1fb391 AD	143	extern struct net init_net;
	144
	145	static inline struct net nf_ct_net(const struct nf_conn ct)
	146	{
c2d9ba9b	147	return read_pnet(&ct->ct_net);
5a1fb391 AD	148	}
5a1fb391 AD	149
9fb9cbb1	150	/* Alter reply tuple (maybe alter helper). */
4e77be46 JP	151	void nf_conntrack_alter_reply(struct nf_conn *ct,
4e77be46 JP	152	const struct nf_conntrack_tuple *newreply);
9fb9cbb1 YK	153
	154	/* Is this tuple taken? (ignoring any belonging to the given
	155	conntrack). */
4e77be46 JP	156	int nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
4e77be46 JP	157	const struct nf_conn *ignored_conntrack);
9fb9cbb1 YK	158
	159	/* Return conntrack_info and tuple hash for given skb. */
	160	static inline struct nf_conn *
	161	nf_ct_get(const struct sk_buff skb, enum ip_conntrack_info ctinfo)
	162	{
	163	*ctinfo = skb->nfctinfo;
	164	return (struct nf_conn *)skb->nfct;
	165	}
	166
	167	/* decrement reference count on a conntrack */
	168	static inline void nf_ct_put(struct nf_conn *ct)
	169	{
	170	NF_CT_ASSERT(ct);
	171	nf_conntrack_put(&ct->ct_general);
	172	}
	173
b9f78f9f	174	/* Protocol module loading */
4e77be46 JP	175	int nf_ct_l3proto_try_module_get(unsigned short l3proto);
4e77be46 JP	176	void nf_ct_l3proto_module_put(unsigned short l3proto);
b9f78f9f	177
ea781f19 ED	178	/*
	179	* Allocate a hashtable of hlist_head (if nulls == 0),
	180	* or hlist_nulls_head (if nulls == 1)
	181	*/
4e77be46	182	void nf_ct_alloc_hashtable(unsigned int sizep, int nulls);
ea781f19	183
4e77be46	184	void nf_ct_free_hashtable(void *hash, unsigned int size);
ac565e5f	185
4e77be46	186	struct nf_conntrack_tuple_hash *
5d0aa2cc PM	187	__nf_conntrack_find(struct net *net, u16 zone,
5d0aa2cc PM	188	const struct nf_conntrack_tuple *tuple);
c1d10adb	189
4e77be46	190	int nf_conntrack_hash_check_insert(struct nf_conn *ct);
02982c27	191	bool nf_ct_delete(struct nf_conn *ct, u32 pid, int report);
c1d10adb	192
4e77be46 JP	193	bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff,
	194	u_int16_t l3num, struct nf_conntrack_tuple *tuple);
	195	bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
	196	const struct nf_conntrack_tuple *orig);
9fb9cbb1	197
4e77be46 JP	198	void __nf_ct_refresh_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
	199	const struct sk_buff *skb,
	200	unsigned long extra_jiffies, int do_acct);
9fb9cbb1 YK	201
	202	/* Refresh conntrack for this many jiffies and do accounting */
	203	static inline void nf_ct_refresh_acct(struct nf_conn *ct,
	204	enum ip_conntrack_info ctinfo,
	205	const struct sk_buff *skb,
	206	unsigned long extra_jiffies)
	207	{
	208	__nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
	209	}
	210
	211	/* Refresh conntrack for this many jiffies */
	212	static inline void nf_ct_refresh(struct nf_conn *ct,
	213	const struct sk_buff *skb,
	214	unsigned long extra_jiffies)
	215	{
	216	__nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
	217	}
	218
4e77be46 JP	219	bool __nf_ct_kill_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
4e77be46 JP	220	const struct sk_buff *skb, int do_acct);
718d4ad9 FH	221
718d4ad9 FH	222	/* kill conntrack and do accounting */
4c889498 DM	223	static inline bool nf_ct_kill_acct(struct nf_conn *ct,
	224	enum ip_conntrack_info ctinfo,
	225	const struct sk_buff *skb)
718d4ad9	226	{
4c889498	227	return __nf_ct_kill_acct(ct, ctinfo, skb, 1);
718d4ad9 FH	228	}
	229
	230	/* kill conntrack without accounting */
4c889498	231	static inline bool nf_ct_kill(struct nf_conn *ct)
718d4ad9	232	{
4c889498	233	return __nf_ct_kill_acct(ct, 0, NULL, 0);
718d4ad9	234	}
51091764	235
9fb9cbb1	236	/* These are for NAT. Icky. */
2d89c68a	237	extern s32 (nf_ct_nat_offset)(const struct nf_conn ct,
f9dd09c7 JK	238	enum ip_conntrack_dir dir,
f9dd09c7 JK	239	u32 seq);
9fb9cbb1	240
9fb9cbb1	241	/* Fake conntrack entry for untracked connections */
b3c5163f	242	DECLARE_PER_CPU(struct nf_conn, nf_conntrack_untracked);
5bfddbd4 ED	243	static inline struct nf_conn *nf_ct_untracked_get(void)
5bfddbd4 ED	244	{
903ceff7	245	return raw_cpu_ptr(&nf_conntrack_untracked);
5bfddbd4	246	}
4e77be46	247	void nf_ct_untracked_status_or(unsigned long bits);
9fb9cbb1	248
9fb9cbb1	249	/* Iterate over all conntracks: if iter returns true, it's deleted. */
4e77be46 JP	250	void nf_ct_iterate_cleanup(struct net *net,
	251	int (iter)(struct nf_conn i, void *data),
	252	void *data, u32 portid, int report);
	253	void nf_conntrack_free(struct nf_conn *ct);
	254	struct nf_conn nf_conntrack_alloc(struct net net, u16 zone,
	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 YK	264	/* It's confirmed if it is, or has been in the hash table. */
	265	static inline int nf_ct_is_confirmed(struct nf_conn *ct)
	266	{
	267	return test_bit(IPS_CONFIRMED_BIT, &ct->status);
	268	}
	269
	270	static inline int nf_ct_is_dying(struct nf_conn *ct)
	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
34641c6d PG	286	struct kernel_param;
34641c6d PG	287
4e77be46	288	int nf_conntrack_set_hashsize(const char val, struct kernel_param kp);
9fb9cbb1	289	extern unsigned int nf_conntrack_htable_size;
e478075c	290	extern unsigned int nf_conntrack_max;
f682cefa CG	291	extern unsigned int nf_conntrack_hash_rnd;
f682cefa CG	292	void init_nf_conntrack_hash_rnd(void);
9fb9cbb1	293
0838aa7f	294	struct nf_conn nf_ct_tmpl_alloc(struct net net, u16 zone, gfp_t flags);
e53376be	295
ac3a546a ED	296	#define NF_CT_STAT_INC(net, count) __this_cpu_inc((net)->ct.stat->count)
ac3a546a ED	297	#define NF_CT_STAT_INC_ATOMIC(net, count) this_cpu_inc((net)->ct.stat->count)
9fb9cbb1	298
4dc06f96 PNA	299	#define MODULE_ALIAS_NFCT_HELPER(helper) \
	300	MODULE_ALIAS("nfct-helper-" helper)
	301
9fb9cbb1	302	#endif /* _NF_CONNTRACK_H */