[mirror_ubuntu-bionic-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/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;
	unsigned int tmpl_padto;
};

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;

#if IS_ENABLED(CONFIG_NF_NAT)
	struct rhlist_head 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)
{
	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);

/* 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);

/* Fake conntrack entry for untracked connections */
DECLARE_PER_CPU_ALIGNED(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);

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
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;
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
	47	#ifdef CONFIG_NETFILTER_DEBUG
55871d04	48	#define NF_CT_ASSERT(x) WARN_ON(!(x))
9fb9cbb1 YK	49	#else
	50	#define NF_CT_ASSERT(x)
	51	#endif
	52
	53	struct nf_conntrack_helper;
	54
6002f266	55	/* Must be kept in sync with the classes defined by helpers */
9d288dff	56	#define NF_CT_MAX_EXPECT_CLASSES 4
6002f266	57
dc808fe2 HW	58	/* nf_conn feature for connections that have a helper */
	59	struct nf_conn_help {
	60	/* Helper. if any */
0906a372	61	struct nf_conntrack_helper __rcu *helper;
dc808fe2	62
b560580a PM	63	struct hlist_head expectations;
b560580a PM	64
dc808fe2	65	/* Current number of expected connections */
6002f266	66	u8 expecting[NF_CT_MAX_EXPECT_CLASSES];
1afc5679 PNA	67
	68	/* private helper information. */
	69	char data[];
dc808fe2 HW	70	};
dc808fe2 HW	71
9fb9cbb1	72	#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
f8eb24a8 PM	73	#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
f8eb24a8 PM	74
ea781f19	75	struct nf_conn {
f330a7fd	76	/* Usage count in here is 1 for hash table, 1 per skb,
b476b72a JDB	77	* plus 1 for any connection(s) we are `master' for
b476b72a JDB	78	*
a9e419dc	79	* Hint, SKB address this struct and refcnt via skb->_nfct and
b476b72a JDB	80	* helpers nf_conntrack_get() and nf_conntrack_put().
	81	* Helper nf_ct_put() equals nf_conntrack_put() by dec refcnt,
	82	* beware nf_ct_get() is different and don't inc refcnt.
	83	*/
9fb9cbb1 YK	84	struct nf_conntrack ct_general;
9fb9cbb1 YK	85
b7779d06 JDB	86	spinlock_t lock;
b7779d06 JDB	87	u16 cpu;
440f0d58	88
6c8dee98 FW	89	#ifdef CONFIG_NF_CONNTRACK_ZONES
	90	struct nf_conntrack_zone zone;
	91	#endif
9fb9cbb1 YK	92	/* XXX should I move this to the tail ? - Y.K */
	93	/* These are my tuples; original and reply */
	94	struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
	95
	96	/* Have we seen traffic both ways yet? (bitset) */
	97	unsigned long status;
	98
f330a7fd FW	99	/* jiffies32 when this ct is considered dead */
f330a7fd FW	100	u32 timeout;
9fb9cbb1	101
0c5c9fb5 EB	102	possible_net_t ct_net;
0c5c9fb5 EB	103
5173bc67 FW	104	#if IS_ENABLED(CONFIG_NF_NAT)
	105	struct rhlist_head nat_bysource;
	106	#endif
c41884ce FW	107	/* all members below initialized via memset */
	108	u8 __nfct_init_offset[0];
	109
	110	/* If we were expected by an expectation, this will be it */
	111	struct nf_conn *master;
	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
ecfab2c9 YK	121	/* Extensions */
ecfab2c9 YK	122	struct nf_ct_ext *ext;
e5fc9e7a CG	123
	124	/* Storage reserved for other modules, must be the last member */
	125	union nf_conntrack_proto proto;
9fb9cbb1 YK	126	};
9fb9cbb1 YK	127
9fb9cbb1 YK	128	static inline struct nf_conn *
	129	nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash)
	130	{
	131	return container_of(hash, struct nf_conn,
	132	tuplehash[hash->tuple.dst.dir]);
	133	}
	134
5e8fbe2a PM	135	static inline u_int16_t nf_ct_l3num(const struct nf_conn *ct)
	136	{
	137	return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
	138	}
	139
	140	static inline u_int8_t nf_ct_protonum(const struct nf_conn *ct)
	141	{
	142	return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
	143	}
	144
f2f3e38c PNA	145	#define nf_ct_tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
f2f3e38c PNA	146
9fb9cbb1 YK	147	/* get master conntrack via master expectation */
	148	#define master_ct(conntr) (conntr->master)
	149
5a1fb391 AD	150	extern struct net init_net;
	151
	152	static inline struct net nf_ct_net(const struct nf_conn ct)
	153	{
c2d9ba9b	154	return read_pnet(&ct->ct_net);
5a1fb391 AD	155	}
5a1fb391 AD	156
9fb9cbb1	157	/* Alter reply tuple (maybe alter helper). */
4e77be46 JP	158	void nf_conntrack_alter_reply(struct nf_conn *ct,
4e77be46 JP	159	const struct nf_conntrack_tuple *newreply);
9fb9cbb1 YK	160
	161	/* Is this tuple taken? (ignoring any belonging to the given
	162	conntrack). */
4e77be46 JP	163	int nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
4e77be46 JP	164	const struct nf_conn *ignored_conntrack);
9fb9cbb1	165
30322309	166	#define NFCT_INFOMASK 7UL
a9e419dc	167	#define NFCT_PTRMASK ~(NFCT_INFOMASK)
30322309	168
9fb9cbb1 YK	169	/* Return conntrack_info and tuple hash for given skb. */
	170	static inline struct nf_conn *
	171	nf_ct_get(const struct sk_buff skb, enum ip_conntrack_info ctinfo)
	172	{
a9e419dc FW	173	*ctinfo = skb->_nfct & NFCT_INFOMASK;
	174
	175	return (struct nf_conn *)(skb->_nfct & NFCT_PTRMASK);
9fb9cbb1 YK	176	}
	177
	178	/* decrement reference count on a conntrack */
	179	static inline void nf_ct_put(struct nf_conn *ct)
	180	{
	181	NF_CT_ASSERT(ct);
	182	nf_conntrack_put(&ct->ct_general);
	183	}
	184
b9f78f9f	185	/* Protocol module loading */
4e77be46 JP	186	int nf_ct_l3proto_try_module_get(unsigned short l3proto);
4e77be46 JP	187	void nf_ct_l3proto_module_put(unsigned short l3proto);
b9f78f9f	188
ecb2421b FW	189	/* load module; enable/disable conntrack in this namespace */
	190	int nf_ct_netns_get(struct net *net, u8 nfproto);
	191	void nf_ct_netns_put(struct net *net, u8 nfproto);
	192
ea781f19 ED	193	/*
	194	* Allocate a hashtable of hlist_head (if nulls == 0),
	195	* or hlist_nulls_head (if nulls == 1)
	196	*/
4e77be46	197	void nf_ct_alloc_hashtable(unsigned int sizep, int nulls);
ea781f19	198
4e77be46	199	void nf_ct_free_hashtable(void *hash, unsigned int size);
ac565e5f	200
4e77be46	201	int nf_conntrack_hash_check_insert(struct nf_conn *ct);
02982c27	202	bool nf_ct_delete(struct nf_conn *ct, u32 pid, int report);
c1d10adb	203
4e77be46	204	bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff,
a31f1adc EB	205	u_int16_t l3num, struct net *net,
a31f1adc EB	206	struct nf_conntrack_tuple *tuple);
4e77be46 JP	207	bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
4e77be46 JP	208	const struct nf_conntrack_tuple *orig);
9fb9cbb1	209
4e77be46 JP	210	void __nf_ct_refresh_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
	211	const struct sk_buff *skb,
	212	unsigned long extra_jiffies, int do_acct);
9fb9cbb1 YK	213
	214	/* Refresh conntrack for this many jiffies and do accounting */
	215	static inline void nf_ct_refresh_acct(struct nf_conn *ct,
	216	enum ip_conntrack_info ctinfo,
	217	const struct sk_buff *skb,
	218	unsigned long extra_jiffies)
	219	{
	220	__nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
	221	}
	222
	223	/* Refresh conntrack for this many jiffies */
	224	static inline void nf_ct_refresh(struct nf_conn *ct,
	225	const struct sk_buff *skb,
	226	unsigned long extra_jiffies)
	227	{
	228	__nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
	229	}
	230
718d4ad9	231	/* kill conntrack and do accounting */
ad66713f FW	232	bool nf_ct_kill_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
ad66713f FW	233	const struct sk_buff *skb);
718d4ad9 FH	234
718d4ad9 FH	235	/* kill conntrack without accounting */
4c889498	236	static inline bool nf_ct_kill(struct nf_conn *ct)
718d4ad9	237	{
ad66713f	238	return nf_ct_delete(ct, 0, 0);
718d4ad9	239	}
51091764	240
9fb9cbb1	241	/* These are for NAT. Icky. */
2d89c68a	242	extern s32 (nf_ct_nat_offset)(const struct nf_conn ct,
f9dd09c7 JK	243	enum ip_conntrack_dir dir,
f9dd09c7 JK	244	u32 seq);
9fb9cbb1	245
9fb9cbb1	246	/* Fake conntrack entry for untracked connections */
170a1fb9	247	DECLARE_PER_CPU_ALIGNED(struct nf_conn, nf_conntrack_untracked);
5bfddbd4 ED	248	static inline struct nf_conn *nf_ct_untracked_get(void)
5bfddbd4 ED	249	{
903ceff7	250	return raw_cpu_ptr(&nf_conntrack_untracked);
5bfddbd4	251	}
4e77be46	252	void nf_ct_untracked_status_or(unsigned long bits);
9fb9cbb1	253
9fb9cbb1	254	/* Iterate over all conntracks: if iter returns true, it's deleted. */
4e77be46 JP	255	void nf_ct_iterate_cleanup(struct net *net,
	256	int (iter)(struct nf_conn i, void *data),
	257	void *data, u32 portid, int report);
308ac914 DB	258
	259	struct nf_conntrack_zone;
	260
4e77be46	261	void nf_conntrack_free(struct nf_conn *ct);
308ac914 DB	262	struct nf_conn nf_conntrack_alloc(struct net net,
308ac914 DB	263	const struct nf_conntrack_zone *zone,
4e77be46 JP	264	const struct nf_conntrack_tuple *orig,
	265	const struct nf_conntrack_tuple *repl,
	266	gfp_t gfp);
9fb9cbb1	267
b2a15a60 PM	268	static inline int nf_ct_is_template(const struct nf_conn *ct)
	269	{
	270	return test_bit(IPS_TEMPLATE_BIT, &ct->status);
	271	}
	272
9fb9cbb1	273	/* It's confirmed if it is, or has been in the hash table. */
d51ed836	274	static inline int nf_ct_is_confirmed(const struct nf_conn *ct)
9fb9cbb1 YK	275	{
	276	return test_bit(IPS_CONFIRMED_BIT, &ct->status);
	277	}
	278
d51ed836	279	static inline int nf_ct_is_dying(const struct nf_conn *ct)
9fb9cbb1 YK	280	{
	281	return test_bit(IPS_DYING_BIT, &ct->status);
	282	}
	283
5bfddbd4	284	static inline int nf_ct_is_untracked(const struct nf_conn *ct)
587aa641	285	{
5bfddbd4	286	return test_bit(IPS_UNTRACKED_BIT, &ct->status);
587aa641 PM	287	}
587aa641 PM	288
42c1edd3 JA	289	/* Packet is received from loopback */
	290	static inline bool nf_is_loopback_packet(const struct sk_buff *skb)
	291	{
	292	return skb->dev && skb->skb_iif && skb->dev->flags & IFF_LOOPBACK;
	293	}
	294
f330a7fd FW	295	#define nfct_time_stamp ((u32)(jiffies))
f330a7fd FW	296
c8607e02 FW	297	/* jiffies until ct expires, 0 if already expired */
	298	static inline unsigned long nf_ct_expires(const struct nf_conn *ct)
	299	{
f330a7fd	300	s32 timeout = ct->timeout - nfct_time_stamp;
c8607e02 FW	301
	302	return timeout > 0 ? timeout : 0;
	303	}
	304
f330a7fd FW	305	static inline bool nf_ct_is_expired(const struct nf_conn *ct)
	306	{
	307	return (__s32)(ct->timeout - nfct_time_stamp) <= 0;
	308	}
	309
	310	/* use after obtaining a reference count */
	311	static inline bool nf_ct_should_gc(const struct nf_conn *ct)
	312	{
	313	return nf_ct_is_expired(ct) && nf_ct_is_confirmed(ct) &&
	314	!nf_ct_is_dying(ct);
	315	}
	316
34641c6d PG	317	struct kernel_param;
34641c6d PG	318
4e77be46	319	int nf_conntrack_set_hashsize(const char val, struct kernel_param kp);
3183ab89	320	int nf_conntrack_hash_resize(unsigned int hashsize);
92e47ba8 LZ	321
92e47ba8 LZ	322	extern struct hlist_nulls_head *nf_conntrack_hash;
9fb9cbb1	323	extern unsigned int nf_conntrack_htable_size;
92e47ba8	324	extern seqcount_t nf_conntrack_generation;
e478075c	325	extern unsigned int nf_conntrack_max;
9fb9cbb1	326
92e47ba8 LZ	327	/* must be called with rcu read lock held */
	328	static inline void
	329	nf_conntrack_get_ht(struct hlist_nulls_head *hash, unsigned int hsize)
	330	{
	331	struct hlist_nulls_head *hptr;
	332	unsigned int sequence, hsz;
	333
	334	do {
	335	sequence = read_seqcount_begin(&nf_conntrack_generation);
	336	hsz = nf_conntrack_htable_size;
	337	hptr = nf_conntrack_hash;
	338	} while (read_seqcount_retry(&nf_conntrack_generation, sequence));
	339
	340	*hash = hptr;
	341	*hsize = hsz;
	342	}
	343
308ac914 DB	344	struct nf_conn nf_ct_tmpl_alloc(struct net net,
	345	const struct nf_conntrack_zone *zone,
	346	gfp_t flags);
9cf94eab	347	void nf_ct_tmpl_free(struct nf_conn *tmpl);
e53376be	348
c74454fa FW	349	static inline void
	350	nf_ct_set(struct sk_buff skb, struct nf_conn ct, enum ip_conntrack_info info)
	351	{
a9e419dc	352	skb->_nfct = (unsigned long)ct \| info;
c74454fa FW	353	}
c74454fa FW	354
ac3a546a ED	355	#define NF_CT_STAT_INC(net, count) __this_cpu_inc((net)->ct.stat->count)
ac3a546a ED	356	#define NF_CT_STAT_INC_ATOMIC(net, count) this_cpu_inc((net)->ct.stat->count)
242922a0	357	#define NF_CT_STAT_ADD_ATOMIC(net, count, v) this_cpu_add((net)->ct.stat->count, (v))
9fb9cbb1	358
4dc06f96 PNA	359	#define MODULE_ALIAS_NFCT_HELPER(helper) \
	360	MODULE_ALIAS("nfct-helper-" helper)
	361
9fb9cbb1	362	#endif /* _NF_CONNTRACK_H */