[thirdparty/linux.git] / include / net / netfilter / nf_conntrack.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * 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;
	unsigned int tmpl_padto;
};

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

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

#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;

#if IS_ENABLED(CONFIG_NF_NAT)
	struct hlist_node	nat_bysource;
#endif
	/* 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);

#define NFCT_INFOMASK	7UL
#define NFCT_PTRMASK	~(NFCT_INFOMASK)

/* 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->_nfct & NFCT_INFOMASK;

	return (struct nf_conn *)(skb->_nfct & NFCT_PTRMASK);
}

/* decrement reference count on a conntrack */
static inline void nf_ct_put(struct nf_conn *ct)
{
	WARN_ON(!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);

/* load module; enable/disable conntrack in this namespace */
int nf_ct_netns_get(struct net *net, u8 nfproto);
void nf_ct_netns_put(struct net *net, u8 nfproto);

/*
 * 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);

/* Set all unconfirmed conntrack as dying */
void nf_ct_unconfirmed_destroy(struct net *);

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

/* also set unconfirmed conntracks as dying. Only use in module exit path. */
void nf_ct_iterate_destroy(int (*iter)(struct nf_conn *i, void *data),
			   void *data);

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);
}

/* 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);

static inline void
nf_ct_set(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info info)
{
	skb->_nfct = (unsigned long)ct | info;
}

#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
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
9fb9cbb1 YK	2	/*
	3	* Connection state tracking for netfilter. This is separated from,
	4	* but required by, the (future) NAT layer; it can also be used by an iptables
	5	* extension.
	6	*
	7	* 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
	8	* - generalize L3 protocol dependent part.
	9	*
	10	* Derived from include/linux/netfiter_ipv4/ip_conntrack.h
	11	*/
	12
	13	#ifndef _NF_CONNTRACK_H
	14	#define _NF_CONNTRACK_H
	15
	16	#include <linux/netfilter/nf_conntrack_common.h>
	17
9fb9cbb1 YK	18	#include <linux/bitops.h>
9fb9cbb1 YK	19	#include <linux/compiler.h>
60063497	20	#include <linux/atomic.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;
c74454fa	37	unsigned int tmpl_padto;
9fb9cbb1 YK	38	};
	39
	40	union nf_conntrack_expect_proto {
	41	/* insert expect proto private data here */
	42	};
	43
9fb9cbb1 YK	44	#include <linux/types.h>
	45	#include <linux/skbuff.h>
	46
9fb9cbb1	47	#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
f8eb24a8 PM	48	#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
f8eb24a8 PM	49
ea781f19	50	struct nf_conn {
f330a7fd	51	/* Usage count in here is 1 for hash table, 1 per skb,
b476b72a JDB	52	* plus 1 for any connection(s) we are `master' for
b476b72a JDB	53	*
a9e419dc	54	* Hint, SKB address this struct and refcnt via skb->_nfct and
b476b72a JDB	55	* helpers nf_conntrack_get() and nf_conntrack_put().
	56	* Helper nf_ct_put() equals nf_conntrack_put() by dec refcnt,
	57	* beware nf_ct_get() is different and don't inc refcnt.
	58	*/
9fb9cbb1 YK	59	struct nf_conntrack ct_general;
9fb9cbb1 YK	60
b7779d06 JDB	61	spinlock_t lock;
b7779d06 JDB	62	u16 cpu;
440f0d58	63
6c8dee98 FW	64	#ifdef CONFIG_NF_CONNTRACK_ZONES
	65	struct nf_conntrack_zone zone;
	66	#endif
9fb9cbb1 YK	67	/* XXX should I move this to the tail ? - Y.K */
	68	/* These are my tuples; original and reply */
	69	struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
	70
	71	/* Have we seen traffic both ways yet? (bitset) */
	72	unsigned long status;
	73
f330a7fd FW	74	/* jiffies32 when this ct is considered dead */
f330a7fd FW	75	u32 timeout;
9fb9cbb1	76
0c5c9fb5 EB	77	possible_net_t ct_net;
0c5c9fb5 EB	78
5173bc67	79	#if IS_ENABLED(CONFIG_NF_NAT)
e1bf1687	80	struct hlist_node nat_bysource;
5173bc67	81	#endif
c41884ce FW	82	/* all members below initialized via memset */
	83	u8 __nfct_init_offset[0];
	84
	85	/* If we were expected by an expectation, this will be it */
	86	struct nf_conn *master;
	87
9fb9cbb1 YK	88	#if defined(CONFIG_NF_CONNTRACK_MARK)
	89	u_int32_t mark;
	90	#endif
	91
7c9728c3 JM	92	#ifdef CONFIG_NF_CONNTRACK_SECMARK
	93	u_int32_t secmark;
	94	#endif
	95
ecfab2c9 YK	96	/* Extensions */
ecfab2c9 YK	97	struct nf_ct_ext *ext;
e5fc9e7a CG	98
	99	/* Storage reserved for other modules, must be the last member */
	100	union nf_conntrack_proto proto;
9fb9cbb1 YK	101	};
9fb9cbb1 YK	102
9fb9cbb1 YK	103	static inline struct nf_conn *
	104	nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash)
	105	{
	106	return container_of(hash, struct nf_conn,
	107	tuplehash[hash->tuple.dst.dir]);
	108	}
	109
5e8fbe2a PM	110	static inline u_int16_t nf_ct_l3num(const struct nf_conn *ct)
	111	{
	112	return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
	113	}
	114
	115	static inline u_int8_t nf_ct_protonum(const struct nf_conn *ct)
	116	{
	117	return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
	118	}
	119
f2f3e38c PNA	120	#define nf_ct_tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
f2f3e38c PNA	121
9fb9cbb1 YK	122	/* get master conntrack via master expectation */
	123	#define master_ct(conntr) (conntr->master)
	124
5a1fb391 AD	125	extern struct net init_net;
	126
	127	static inline struct net nf_ct_net(const struct nf_conn ct)
	128	{
c2d9ba9b	129	return read_pnet(&ct->ct_net);
5a1fb391 AD	130	}
5a1fb391 AD	131
9fb9cbb1	132	/* Alter reply tuple (maybe alter helper). */
4e77be46 JP	133	void nf_conntrack_alter_reply(struct nf_conn *ct,
4e77be46 JP	134	const struct nf_conntrack_tuple *newreply);
9fb9cbb1 YK	135
	136	/* Is this tuple taken? (ignoring any belonging to the given
	137	conntrack). */
4e77be46 JP	138	int nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
4e77be46 JP	139	const struct nf_conn *ignored_conntrack);
9fb9cbb1	140
30322309	141	#define NFCT_INFOMASK 7UL
a9e419dc	142	#define NFCT_PTRMASK ~(NFCT_INFOMASK)
30322309	143
9fb9cbb1 YK	144	/* Return conntrack_info and tuple hash for given skb. */
	145	static inline struct nf_conn *
	146	nf_ct_get(const struct sk_buff skb, enum ip_conntrack_info ctinfo)
	147	{
a9e419dc FW	148	*ctinfo = skb->_nfct & NFCT_INFOMASK;
	149
	150	return (struct nf_conn *)(skb->_nfct & NFCT_PTRMASK);
9fb9cbb1 YK	151	}
	152
	153	/* decrement reference count on a conntrack */
	154	static inline void nf_ct_put(struct nf_conn *ct)
	155	{
44d6e2f2	156	WARN_ON(!ct);
9fb9cbb1 YK	157	nf_conntrack_put(&ct->ct_general);
	158	}
	159
b9f78f9f	160	/* Protocol module loading */
4e77be46 JP	161	int nf_ct_l3proto_try_module_get(unsigned short l3proto);
4e77be46 JP	162	void nf_ct_l3proto_module_put(unsigned short l3proto);
b9f78f9f	163
ecb2421b FW	164	/* load module; enable/disable conntrack in this namespace */
	165	int nf_ct_netns_get(struct net *net, u8 nfproto);
	166	void nf_ct_netns_put(struct net *net, u8 nfproto);
	167
ea781f19 ED	168	/*
	169	* Allocate a hashtable of hlist_head (if nulls == 0),
	170	* or hlist_nulls_head (if nulls == 1)
	171	*/
4e77be46	172	void nf_ct_alloc_hashtable(unsigned int sizep, int nulls);
ea781f19	173
4e77be46	174	void nf_ct_free_hashtable(void *hash, unsigned int size);
ac565e5f	175
4e77be46	176	int nf_conntrack_hash_check_insert(struct nf_conn *ct);
02982c27	177	bool nf_ct_delete(struct nf_conn *ct, u32 pid, int report);
c1d10adb	178
4e77be46	179	bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff,
a31f1adc EB	180	u_int16_t l3num, struct net *net,
a31f1adc EB	181	struct nf_conntrack_tuple *tuple);
4e77be46 JP	182	bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
4e77be46 JP	183	const struct nf_conntrack_tuple *orig);
9fb9cbb1	184
4e77be46 JP	185	void __nf_ct_refresh_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
	186	const struct sk_buff *skb,
	187	unsigned long extra_jiffies, int do_acct);
9fb9cbb1 YK	188
	189	/* Refresh conntrack for this many jiffies and do accounting */
	190	static inline void nf_ct_refresh_acct(struct nf_conn *ct,
	191	enum ip_conntrack_info ctinfo,
	192	const struct sk_buff *skb,
	193	unsigned long extra_jiffies)
	194	{
	195	__nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
	196	}
	197
	198	/* Refresh conntrack for this many jiffies */
	199	static inline void nf_ct_refresh(struct nf_conn *ct,
	200	const struct sk_buff *skb,
	201	unsigned long extra_jiffies)
	202	{
	203	__nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
	204	}
	205
718d4ad9	206	/* kill conntrack and do accounting */
ad66713f FW	207	bool nf_ct_kill_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
ad66713f FW	208	const struct sk_buff *skb);
718d4ad9 FH	209
718d4ad9 FH	210	/* kill conntrack without accounting */
4c889498	211	static inline bool nf_ct_kill(struct nf_conn *ct)
718d4ad9	212	{
ad66713f	213	return nf_ct_delete(ct, 0, 0);
718d4ad9	214	}
51091764	215
9fb9cbb1	216	/* These are for NAT. Icky. */
2d89c68a	217	extern s32 (nf_ct_nat_offset)(const struct nf_conn ct,
f9dd09c7 JK	218	enum ip_conntrack_dir dir,
f9dd09c7 JK	219	u32 seq);
9fb9cbb1	220
84657984 FW	221	/* Set all unconfirmed conntrack as dying */
	222	void nf_ct_unconfirmed_destroy(struct net *);
	223
9fb9cbb1	224	/* Iterate over all conntracks: if iter returns true, it's deleted. */
9fd6452d FW	225	void nf_ct_iterate_cleanup_net(struct net *net,
	226	int (iter)(struct nf_conn i, void *data),
	227	void *data, u32 portid, int report);
308ac914	228
2843fb69 FW	229	/* also set unconfirmed conntracks as dying. Only use in module exit path. */
	230	void nf_ct_iterate_destroy(int (iter)(struct nf_conn i, void *data),
	231	void *data);
	232
308ac914 DB	233	struct nf_conntrack_zone;
308ac914 DB	234
4e77be46	235	void nf_conntrack_free(struct nf_conn *ct);
308ac914 DB	236	struct nf_conn nf_conntrack_alloc(struct net net,
308ac914 DB	237	const struct nf_conntrack_zone *zone,
4e77be46 JP	238	const struct nf_conntrack_tuple *orig,
	239	const struct nf_conntrack_tuple *repl,
	240	gfp_t gfp);
9fb9cbb1	241
b2a15a60 PM	242	static inline int nf_ct_is_template(const struct nf_conn *ct)
	243	{
	244	return test_bit(IPS_TEMPLATE_BIT, &ct->status);
	245	}
	246
9fb9cbb1	247	/* It's confirmed if it is, or has been in the hash table. */
d51ed836	248	static inline int nf_ct_is_confirmed(const struct nf_conn *ct)
9fb9cbb1 YK	249	{
	250	return test_bit(IPS_CONFIRMED_BIT, &ct->status);
	251	}
	252
d51ed836	253	static inline int nf_ct_is_dying(const struct nf_conn *ct)
9fb9cbb1 YK	254	{
	255	return test_bit(IPS_DYING_BIT, &ct->status);
	256	}
	257
42c1edd3 JA	258	/* Packet is received from loopback */
	259	static inline bool nf_is_loopback_packet(const struct sk_buff *skb)
	260	{
	261	return skb->dev && skb->skb_iif && skb->dev->flags & IFF_LOOPBACK;
	262	}
	263
f330a7fd FW	264	#define nfct_time_stamp ((u32)(jiffies))
f330a7fd FW	265
c8607e02 FW	266	/* jiffies until ct expires, 0 if already expired */
	267	static inline unsigned long nf_ct_expires(const struct nf_conn *ct)
	268	{
f330a7fd	269	s32 timeout = ct->timeout - nfct_time_stamp;
c8607e02 FW	270
	271	return timeout > 0 ? timeout : 0;
	272	}
	273
f330a7fd FW	274	static inline bool nf_ct_is_expired(const struct nf_conn *ct)
	275	{
	276	return (__s32)(ct->timeout - nfct_time_stamp) <= 0;
	277	}
	278
	279	/* use after obtaining a reference count */
	280	static inline bool nf_ct_should_gc(const struct nf_conn *ct)
	281	{
	282	return nf_ct_is_expired(ct) && nf_ct_is_confirmed(ct) &&
	283	!nf_ct_is_dying(ct);
	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);
3183ab89	289	int nf_conntrack_hash_resize(unsigned int hashsize);
92e47ba8 LZ	290
92e47ba8 LZ	291	extern struct hlist_nulls_head *nf_conntrack_hash;
9fb9cbb1	292	extern unsigned int nf_conntrack_htable_size;
92e47ba8	293	extern seqcount_t nf_conntrack_generation;
e478075c	294	extern unsigned int nf_conntrack_max;
9fb9cbb1	295
92e47ba8 LZ	296	/* must be called with rcu read lock held */
	297	static inline void
	298	nf_conntrack_get_ht(struct hlist_nulls_head *hash, unsigned int hsize)
	299	{
	300	struct hlist_nulls_head *hptr;
	301	unsigned int sequence, hsz;
	302
	303	do {
	304	sequence = read_seqcount_begin(&nf_conntrack_generation);
	305	hsz = nf_conntrack_htable_size;
	306	hptr = nf_conntrack_hash;
	307	} while (read_seqcount_retry(&nf_conntrack_generation, sequence));
	308
	309	*hash = hptr;
	310	*hsize = hsz;
	311	}
	312
308ac914 DB	313	struct nf_conn nf_ct_tmpl_alloc(struct net net,
	314	const struct nf_conntrack_zone *zone,
	315	gfp_t flags);
9cf94eab	316	void nf_ct_tmpl_free(struct nf_conn *tmpl);
e53376be	317
c74454fa FW	318	static inline void
	319	nf_ct_set(struct sk_buff skb, struct nf_conn ct, enum ip_conntrack_info info)
	320	{
a9e419dc	321	skb->_nfct = (unsigned long)ct \| info;
c74454fa FW	322	}
c74454fa FW	323
ac3a546a ED	324	#define NF_CT_STAT_INC(net, count) __this_cpu_inc((net)->ct.stat->count)
ac3a546a ED	325	#define NF_CT_STAT_INC_ATOMIC(net, count) this_cpu_inc((net)->ct.stat->count)
242922a0	326	#define NF_CT_STAT_ADD_ATOMIC(net, count, v) this_cpu_add((net)->ct.stat->count, (v))
9fb9cbb1	327
4dc06f96 PNA	328	#define MODULE_ALIAS_NFCT_HELPER(helper) \
	329	MODULE_ALIAS("nfct-helper-" helper)
	330
9fb9cbb1	331	#endif /* _NF_CONNTRACK_H */