[deliverable/linux.git] / include / linux / netfilter.h

#ifndef __LINUX_NETFILTER_H
#define __LINUX_NETFILTER_H

#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/net.h>
#include <linux/if.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/wait.h>
#include <linux/list.h>
#include <uapi/linux/netfilter.h>
#ifdef CONFIG_NETFILTER
static inline int NF_DROP_GETERR(int verdict)
{
	return -(verdict >> NF_VERDICT_QBITS);
}

static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1,
				   const union nf_inet_addr *a2)
{
	return a1->all[0] == a2->all[0] &&
	       a1->all[1] == a2->all[1] &&
	       a1->all[2] == a2->all[2] &&
	       a1->all[3] == a2->all[3];
}

static inline void nf_inet_addr_mask(const union nf_inet_addr *a1,
				     union nf_inet_addr *result,
				     const union nf_inet_addr *mask)
{
	result->all[0] = a1->all[0] & mask->all[0];
	result->all[1] = a1->all[1] & mask->all[1];
	result->all[2] = a1->all[2] & mask->all[2];
	result->all[3] = a1->all[3] & mask->all[3];
}

extern void netfilter_init(void);

/* Largest hook number + 1 */
#define NF_MAX_HOOKS 8

struct sk_buff;

typedef unsigned int nf_hookfn(unsigned int hooknum,
			       struct sk_buff *skb,
			       const struct net_device *in,
			       const struct net_device *out,
			       int (*okfn)(struct sk_buff *));

struct nf_hook_ops {
	struct list_head list;

	/* User fills in from here down. */
	nf_hookfn *hook;
	struct module *owner;
	u_int8_t pf;
	unsigned int hooknum;
	/* Hooks are ordered in ascending priority. */
	int priority;
};

struct nf_sockopt_ops {
	struct list_head list;

	u_int8_t pf;

	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
	int set_optmin;
	int set_optmax;
	int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len);
#ifdef CONFIG_COMPAT
	int (*compat_set)(struct sock *sk, int optval,
			void __user *user, unsigned int len);
#endif
	int get_optmin;
	int get_optmax;
	int (*get)(struct sock *sk, int optval, void __user *user, int *len);
#ifdef CONFIG_COMPAT
	int (*compat_get)(struct sock *sk, int optval,
			void __user *user, int *len);
#endif
	/* Use the module struct to lock set/get code in place */
	struct module *owner;
};

/* Function to register/unregister hook points. */
int nf_register_hook(struct nf_hook_ops *reg);
void nf_unregister_hook(struct nf_hook_ops *reg);
int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);

/* Functions to register get/setsockopt ranges (non-inclusive).  You
   need to check permissions yourself! */
int nf_register_sockopt(struct nf_sockopt_ops *reg);
void nf_unregister_sockopt(struct nf_sockopt_ops *reg);

extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS];

#if defined(CONFIG_JUMP_LABEL)
#include <linux/static_key.h>
extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook)
{
	if (__builtin_constant_p(pf) &&
	    __builtin_constant_p(hook))
		return static_key_false(&nf_hooks_needed[pf][hook]);

	return !list_empty(&nf_hooks[pf][hook]);
}
#else
static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook)
{
	return !list_empty(&nf_hooks[pf][hook]);
}
#endif

int nf_hook_slow(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
		 struct net_device *indev, struct net_device *outdev,
		 int (*okfn)(struct sk_buff *), int thresh);

/**
 *	nf_hook_thresh - call a netfilter hook
 *	
 *	Returns 1 if the hook has allowed the packet to pass.  The function
 *	okfn must be invoked by the caller in this case.  Any other return
 *	value indicates the packet has been consumed by the hook.
 */
static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
				 struct sk_buff *skb,
				 struct net_device *indev,
				 struct net_device *outdev,
				 int (*okfn)(struct sk_buff *), int thresh)
{
	if (nf_hooks_active(pf, hook))
		return nf_hook_slow(pf, hook, skb, indev, outdev, okfn, thresh);
	return 1;
}

static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
			  struct net_device *indev, struct net_device *outdev,
			  int (*okfn)(struct sk_buff *))
{
	return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN);
}
                   
/* Activate hook; either okfn or kfree_skb called, unless a hook
   returns NF_STOLEN (in which case, it's up to the hook to deal with
   the consequences).

   Returns -ERRNO if packet dropped.  Zero means queued, stolen or
   accepted.
*/

/* RR:
   > I don't want nf_hook to return anything because people might forget
   > about async and trust the return value to mean "packet was ok".

   AK:
   Just document it clearly, then you can expect some sense from kernel
   coders :)
*/

static inline int
NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	       struct net_device *in, struct net_device *out,
	       int (*okfn)(struct sk_buff *), int thresh)
{
	int ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, thresh);
	if (ret == 1)
		ret = okfn(skb);
	return ret;
}

static inline int
NF_HOOK_COND(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	     struct net_device *in, struct net_device *out,
	     int (*okfn)(struct sk_buff *), bool cond)
{
	int ret;

	if (!cond ||
	    ((ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, INT_MIN)) == 1))
		ret = okfn(skb);
	return ret;
}

static inline int
NF_HOOK(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	struct net_device *in, struct net_device *out,
	int (*okfn)(struct sk_buff *))
{
	return NF_HOOK_THRESH(pf, hook, skb, in, out, okfn, INT_MIN);
}

/* Call setsockopt() */
int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt,
		  unsigned int len);
int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt,
		  int *len);
#ifdef CONFIG_COMPAT
int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval,
		char __user *opt, unsigned int len);
int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval,
		char __user *opt, int *len);
#endif

/* Call this before modifying an existing packet: ensures it is
   modifiable and linear to the point you care about (writable_len).
   Returns true or false. */
extern int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);

struct flowi;
struct nf_queue_entry;

struct nf_afinfo {
	unsigned short	family;
	__sum16		(*checksum)(struct sk_buff *skb, unsigned int hook,
				    unsigned int dataoff, u_int8_t protocol);
	__sum16		(*checksum_partial)(struct sk_buff *skb,
					    unsigned int hook,
					    unsigned int dataoff,
					    unsigned int len,
					    u_int8_t protocol);
	int		(*route)(struct net *net, struct dst_entry **dst,
				 struct flowi *fl, bool strict);
	void		(*saveroute)(const struct sk_buff *skb,
				     struct nf_queue_entry *entry);
	int		(*reroute)(struct sk_buff *skb,
				   const struct nf_queue_entry *entry);
	int		route_key_size;
};

extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO];
static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
{
	return rcu_dereference(nf_afinfo[family]);
}

static inline __sum16
nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
	    u_int8_t protocol, unsigned short family)
{
	const struct nf_afinfo *afinfo;
	__sum16 csum = 0;

	rcu_read_lock();
	afinfo = nf_get_afinfo(family);
	if (afinfo)
		csum = afinfo->checksum(skb, hook, dataoff, protocol);
	rcu_read_unlock();
	return csum;
}

static inline __sum16
nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
		    unsigned int dataoff, unsigned int len,
		    u_int8_t protocol, unsigned short family)
{
	const struct nf_afinfo *afinfo;
	__sum16 csum = 0;

	rcu_read_lock();
	afinfo = nf_get_afinfo(family);
	if (afinfo)
		csum = afinfo->checksum_partial(skb, hook, dataoff, len,
						protocol);
	rcu_read_unlock();
	return csum;
}

extern int nf_register_afinfo(const struct nf_afinfo *afinfo);
extern void nf_unregister_afinfo(const struct nf_afinfo *afinfo);

#include <net/flow.h>
extern void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *);

static inline void
nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
{
#ifdef CONFIG_NF_NAT_NEEDED
	void (*decodefn)(struct sk_buff *, struct flowi *);

	rcu_read_lock();
	decodefn = rcu_dereference(nf_nat_decode_session_hook);
	if (decodefn)
		decodefn(skb, fl);
	rcu_read_unlock();
#endif
}

#ifdef CONFIG_PROC_FS
#include <linux/proc_fs.h>
extern struct proc_dir_entry *proc_net_netfilter;
#endif

#else /* !CONFIG_NETFILTER */
#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb)
#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb)
static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
				 struct sk_buff *skb,
				 struct net_device *indev,
				 struct net_device *outdev,
				 int (*okfn)(struct sk_buff *), int thresh)
{
	return okfn(skb);
}
static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
			  struct net_device *indev, struct net_device *outdev,
			  int (*okfn)(struct sk_buff *))
{
	return 1;
}
struct flowi;
static inline void
nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
{
}
#endif /*CONFIG_NETFILTER*/

#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
extern void (*ip_ct_attach)(struct sk_buff *, struct sk_buff *) __rcu;
extern void nf_ct_attach(struct sk_buff *, struct sk_buff *);
extern void (*nf_ct_destroy)(struct nf_conntrack *) __rcu;

struct nf_conn;
struct nlattr;

struct nfq_ct_hook {
	size_t (*build_size)(const struct nf_conn *ct);
	int (*build)(struct sk_buff *skb, struct nf_conn *ct);
	int (*parse)(const struct nlattr *attr, struct nf_conn *ct);
};
extern struct nfq_ct_hook __rcu *nfq_ct_hook;

struct nfq_ct_nat_hook {
	void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct,
			   u32 ctinfo, int off);
};
extern struct nfq_ct_nat_hook __rcu *nfq_ct_nat_hook;
#else
static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {}
#endif

#endif /*__LINUX_NETFILTER_H*/
Commit	Line	Data
	1	#ifndef __LINUX_NETFILTER_H
	2	#define __LINUX_NETFILTER_H
	3
	4	#include <linux/init.h>
	5	#include <linux/skbuff.h>
	6	#include <linux/net.h>
	7	#include <linux/if.h>
	8	#include <linux/in.h>
	9	#include <linux/in6.h>
	10	#include <linux/wait.h>
	11	#include <linux/list.h>
	12	#include <uapi/linux/netfilter.h>
	13	#ifdef CONFIG_NETFILTER
	14	static inline int NF_DROP_GETERR(int verdict)
	15	{
	16	return -(verdict >> NF_VERDICT_QBITS);
	17	}
	18
	19	static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1,
	20	const union nf_inet_addr *a2)
	21	{
	22	return a1->all[0] == a2->all[0] &&
	23	a1->all[1] == a2->all[1] &&
	24	a1->all[2] == a2->all[2] &&
	25	a1->all[3] == a2->all[3];
	26	}
	27
	28	static inline void nf_inet_addr_mask(const union nf_inet_addr *a1,
	29	union nf_inet_addr *result,
	30	const union nf_inet_addr *mask)
	31	{
	32	result->all[0] = a1->all[0] & mask->all[0];
	33	result->all[1] = a1->all[1] & mask->all[1];
	34	result->all[2] = a1->all[2] & mask->all[2];
	35	result->all[3] = a1->all[3] & mask->all[3];
	36	}
	37
	38	extern void netfilter_init(void);
	39
	40	/* Largest hook number + 1 */
	41	#define NF_MAX_HOOKS 8
	42
	43	struct sk_buff;
	44
	45	typedef unsigned int nf_hookfn(unsigned int hooknum,
	46	struct sk_buff *skb,
	47	const struct net_device *in,
	48	const struct net_device *out,
	49	int (okfn)(struct sk_buff ));
	50
	51	struct nf_hook_ops {
	52	struct list_head list;
	53
	54	/* User fills in from here down. */
	55	nf_hookfn *hook;
	56	struct module *owner;
	57	u_int8_t pf;
	58	unsigned int hooknum;
	59	/* Hooks are ordered in ascending priority. */
	60	int priority;
	61	};
	62
	63	struct nf_sockopt_ops {
	64	struct list_head list;
	65
	66	u_int8_t pf;
	67
	68	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
	69	int set_optmin;
	70	int set_optmax;
	71	int (set)(struct sock sk, int optval, void __user *user, unsigned int len);
	72	#ifdef CONFIG_COMPAT
	73	int (compat_set)(struct sock sk, int optval,
	74	void __user *user, unsigned int len);
	75	#endif
	76	int get_optmin;
	77	int get_optmax;
	78	int (get)(struct sock sk, int optval, void __user user, int len);
	79	#ifdef CONFIG_COMPAT
	80	int (compat_get)(struct sock sk, int optval,
	81	void __user user, int len);
	82	#endif
	83	/* Use the module struct to lock set/get code in place */
	84	struct module *owner;
	85	};
	86
	87	/* Function to register/unregister hook points. */
	88	int nf_register_hook(struct nf_hook_ops *reg);
	89	void nf_unregister_hook(struct nf_hook_ops *reg);
	90	int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
	91	void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);
	92
	93	/* Functions to register get/setsockopt ranges (non-inclusive). You
	94	need to check permissions yourself! */
	95	int nf_register_sockopt(struct nf_sockopt_ops *reg);
	96	void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
	97
	98	extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
	99
	100	#if defined(CONFIG_JUMP_LABEL)
	101	#include <linux/static_key.h>
	102	extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
	103	static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook)
	104	{
	105	if (__builtin_constant_p(pf) &&
	106	__builtin_constant_p(hook))
	107	return static_key_false(&nf_hooks_needed[pf][hook]);
	108
	109	return !list_empty(&nf_hooks[pf][hook]);
	110	}
	111	#else
	112	static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook)
	113	{
	114	return !list_empty(&nf_hooks[pf][hook]);
	115	}
	116	#endif
	117
	118	int nf_hook_slow(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
	119	struct net_device indev, struct net_device outdev,
	120	int (okfn)(struct sk_buff ), int thresh);
	121
	122	/**
	123	* nf_hook_thresh - call a netfilter hook
	124	*
	125	* Returns 1 if the hook has allowed the packet to pass. The function
	126	* okfn must be invoked by the caller in this case. Any other return
	127	* value indicates the packet has been consumed by the hook.
	128	*/
	129	static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
	130	struct sk_buff *skb,
	131	struct net_device *indev,
	132	struct net_device *outdev,
	133	int (okfn)(struct sk_buff ), int thresh)
	134	{
	135	if (nf_hooks_active(pf, hook))
	136	return nf_hook_slow(pf, hook, skb, indev, outdev, okfn, thresh);
	137	return 1;
	138	}
	139
	140	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
	141	struct net_device indev, struct net_device outdev,
	142	int (okfn)(struct sk_buff ))
	143	{
	144	return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN);
	145	}
	146
	147	/* Activate hook; either okfn or kfree_skb called, unless a hook
	148	returns NF_STOLEN (in which case, it's up to the hook to deal with
	149	the consequences).
	150
	151	Returns -ERRNO if packet dropped. Zero means queued, stolen or
	152	accepted.
	153	*/
	154
	155	/* RR:
	156	> I don't want nf_hook to return anything because people might forget
	157	> about async and trust the return value to mean "packet was ok".
	158
	159	AK:
	160	Just document it clearly, then you can expect some sense from kernel
	161	coders :)
	162	*/
	163
	164	static inline int
	165	NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	166	struct net_device in, struct net_device out,
	167	int (okfn)(struct sk_buff ), int thresh)
	168	{
	169	int ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, thresh);
	170	if (ret == 1)
	171	ret = okfn(skb);
	172	return ret;
	173	}
	174
	175	static inline int
	176	NF_HOOK_COND(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	177	struct net_device in, struct net_device out,
	178	int (okfn)(struct sk_buff ), bool cond)
	179	{
	180	int ret;
	181
	182	if (!cond \|\|
	183	((ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, INT_MIN)) == 1))
	184	ret = okfn(skb);
	185	return ret;
	186	}
	187
	188	static inline int
	189	NF_HOOK(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	190	struct net_device in, struct net_device out,
	191	int (okfn)(struct sk_buff ))
	192	{
	193	return NF_HOOK_THRESH(pf, hook, skb, in, out, okfn, INT_MIN);
	194	}
	195
	196	/* Call setsockopt() */
	197	int nf_setsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
	198	unsigned int len);
	199	int nf_getsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
	200	int *len);
	201	#ifdef CONFIG_COMPAT
	202	int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval,
	203	char __user *opt, unsigned int len);
	204	int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval,
	205	char __user opt, int len);
	206	#endif
	207
	208	/* Call this before modifying an existing packet: ensures it is
	209	modifiable and linear to the point you care about (writable_len).
	210	Returns true or false. */
	211	extern int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);
	212
	213	struct flowi;
	214	struct nf_queue_entry;
	215
	216	struct nf_afinfo {
	217	unsigned short family;
	218	__sum16 (checksum)(struct sk_buff skb, unsigned int hook,
	219	unsigned int dataoff, u_int8_t protocol);
	220	__sum16 (checksum_partial)(struct sk_buff skb,
	221	unsigned int hook,
	222	unsigned int dataoff,
	223	unsigned int len,
	224	u_int8_t protocol);
	225	int (route)(struct net net, struct dst_entry **dst,
	226	struct flowi *fl, bool strict);
	227	void (saveroute)(const struct sk_buff skb,
	228	struct nf_queue_entry *entry);
	229	int (reroute)(struct sk_buff skb,
	230	const struct nf_queue_entry *entry);
	231	int route_key_size;
	232	};
	233
	234	extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO];
	235	static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
	236	{
	237	return rcu_dereference(nf_afinfo[family]);
	238	}
	239
	240	static inline __sum16
	241	nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
	242	u_int8_t protocol, unsigned short family)
	243	{
	244	const struct nf_afinfo *afinfo;
	245	__sum16 csum = 0;
	246
	247	rcu_read_lock();
	248	afinfo = nf_get_afinfo(family);
	249	if (afinfo)
	250	csum = afinfo->checksum(skb, hook, dataoff, protocol);
	251	rcu_read_unlock();
	252	return csum;
	253	}
	254
	255	static inline __sum16
	256	nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
	257	unsigned int dataoff, unsigned int len,
	258	u_int8_t protocol, unsigned short family)
	259	{
	260	const struct nf_afinfo *afinfo;
	261	__sum16 csum = 0;
	262
	263	rcu_read_lock();
	264	afinfo = nf_get_afinfo(family);
	265	if (afinfo)
	266	csum = afinfo->checksum_partial(skb, hook, dataoff, len,
	267	protocol);
	268	rcu_read_unlock();
	269	return csum;
	270	}
	271
	272	extern int nf_register_afinfo(const struct nf_afinfo *afinfo);
	273	extern void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
	274
	275	#include <net/flow.h>
	276	extern void (nf_nat_decode_session_hook)(struct sk_buff , struct flowi *);
	277
	278	static inline void
	279	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
	280	{
	281	#ifdef CONFIG_NF_NAT_NEEDED
	282	void (decodefn)(struct sk_buff , struct flowi *);
	283
	284	rcu_read_lock();
	285	decodefn = rcu_dereference(nf_nat_decode_session_hook);
	286	if (decodefn)
	287	decodefn(skb, fl);
	288	rcu_read_unlock();
	289	#endif
	290	}
	291
	292	#ifdef CONFIG_PROC_FS
	293	#include <linux/proc_fs.h>
	294	extern struct proc_dir_entry *proc_net_netfilter;
	295	#endif
	296
	297	#else /* !CONFIG_NETFILTER */
	298	#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb)
	299	#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb)
	300	static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
	301	struct sk_buff *skb,
	302	struct net_device *indev,
	303	struct net_device *outdev,
	304	int (okfn)(struct sk_buff ), int thresh)
	305	{
	306	return okfn(skb);
	307	}
	308	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
	309	struct net_device indev, struct net_device outdev,
	310	int (okfn)(struct sk_buff ))
	311	{
	312	return 1;
	313	}
	314	struct flowi;
	315	static inline void
	316	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
	317	{
	318	}
	319	#endif /CONFIG_NETFILTER/
	320
	321	#if defined(CONFIG_NF_CONNTRACK) \|\| defined(CONFIG_NF_CONNTRACK_MODULE)
	322	extern void (ip_ct_attach)(struct sk_buff , struct sk_buff *) __rcu;
	323	extern void nf_ct_attach(struct sk_buff , struct sk_buff );
	324	extern void (nf_ct_destroy)(struct nf_conntrack ) __rcu;
	325
	326	struct nf_conn;
	327	struct nlattr;
	328
	329	struct nfq_ct_hook {
	330	size_t (build_size)(const struct nf_conn ct);
	331	int (build)(struct sk_buff skb, struct nf_conn *ct);
	332	int (parse)(const struct nlattr attr, struct nf_conn *ct);
	333	};
	334	extern struct nfq_ct_hook __rcu *nfq_ct_hook;
	335
	336	struct nfq_ct_nat_hook {
	337	void (seq_adjust)(struct sk_buff skb, struct nf_conn *ct,
	338	u32 ctinfo, int off);
	339	};
	340	extern struct nfq_ct_nat_hook __rcu *nfq_ct_nat_hook;
	341	#else
	342	static inline void nf_ct_attach(struct sk_buff new, struct sk_buff skb) {}
	343	#endif
	344
	345	#endif /__LINUX_NETFILTER_H/