[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 <linux/static_key.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];
}

int netfilter_init(void);

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

struct sk_buff;

struct nf_hook_ops;

struct nf_hook_state {
	unsigned int hook;
	int thresh;
	u_int8_t pf;
	struct net_device *in;
	struct net_device *out;
	int (*okfn)(struct sk_buff *);
};

typedef unsigned int nf_hookfn(const struct nf_hook_ops *ops,
			       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;
	void		*priv;
	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];

#ifdef HAVE_JUMP_LABEL
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(struct sk_buff *skb, struct nf_hook_state *state);

/**
 *	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)) {
		struct nf_hook_state state = {
			.hook = hook,
			.thresh = thresh,
			.pf = pf,
			.in = indev,
			.out = outdev,
			.okfn = okfn
		};

		return nf_hook_slow(skb, &state);
	}
	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. */
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;
}

int nf_register_afinfo(const struct nf_afinfo *afinfo);
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
}

#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 *, const struct sk_buff *) __rcu;
void nf_ct_attach(struct sk_buff *, const struct sk_buff *);
extern void (*nf_ct_destroy)(struct nf_conntrack *) __rcu;

struct nf_conn;
enum ip_conntrack_info;
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);
	int (*attach_expect)(const struct nlattr *attr, struct nf_conn *ct,
			     u32 portid, u32 report);
	void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct,
			   enum ip_conntrack_info ctinfo, s32 off);
};
extern struct nfq_ct_hook __rcu *nfq_ct_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 <linux/static_key.h>
	13	#include <uapi/linux/netfilter.h>
	14	#ifdef CONFIG_NETFILTER
	15	static inline int NF_DROP_GETERR(int verdict)
	16	{
	17	return -(verdict >> NF_VERDICT_QBITS);
	18	}
	19
	20	static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1,
	21	const union nf_inet_addr *a2)
	22	{
	23	return a1->all[0] == a2->all[0] &&
	24	a1->all[1] == a2->all[1] &&
	25	a1->all[2] == a2->all[2] &&
	26	a1->all[3] == a2->all[3];
	27	}
	28
	29	static inline void nf_inet_addr_mask(const union nf_inet_addr *a1,
	30	union nf_inet_addr *result,
	31	const union nf_inet_addr *mask)
	32	{
	33	result->all[0] = a1->all[0] & mask->all[0];
	34	result->all[1] = a1->all[1] & mask->all[1];
	35	result->all[2] = a1->all[2] & mask->all[2];
	36	result->all[3] = a1->all[3] & mask->all[3];
	37	}
	38
	39	int netfilter_init(void);
	40
	41	/* Largest hook number + 1 */
	42	#define NF_MAX_HOOKS 8
	43
	44	struct sk_buff;
	45
	46	struct nf_hook_ops;
	47
	48	struct nf_hook_state {
	49	unsigned int hook;
	50	int thresh;
	51	u_int8_t pf;
	52	struct net_device *in;
	53	struct net_device *out;
	54	int (okfn)(struct sk_buff );
	55	};
	56
	57	typedef unsigned int nf_hookfn(const struct nf_hook_ops *ops,
	58	struct sk_buff *skb,
	59	const struct net_device *in,
	60	const struct net_device *out,
	61	int (okfn)(struct sk_buff ));
	62
	63	struct nf_hook_ops {
	64	struct list_head list;
	65
	66	/* User fills in from here down. */
	67	nf_hookfn *hook;
	68	struct module *owner;
	69	void *priv;
	70	u_int8_t pf;
	71	unsigned int hooknum;
	72	/* Hooks are ordered in ascending priority. */
	73	int priority;
	74	};
	75
	76	struct nf_sockopt_ops {
	77	struct list_head list;
	78
	79	u_int8_t pf;
	80
	81	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
	82	int set_optmin;
	83	int set_optmax;
	84	int (set)(struct sock sk, int optval, void __user *user, unsigned int len);
	85	#ifdef CONFIG_COMPAT
	86	int (compat_set)(struct sock sk, int optval,
	87	void __user *user, unsigned int len);
	88	#endif
	89	int get_optmin;
	90	int get_optmax;
	91	int (get)(struct sock sk, int optval, void __user user, int len);
	92	#ifdef CONFIG_COMPAT
	93	int (compat_get)(struct sock sk, int optval,
	94	void __user user, int len);
	95	#endif
	96	/* Use the module struct to lock set/get code in place */
	97	struct module *owner;
	98	};
	99
	100	/* Function to register/unregister hook points. */
	101	int nf_register_hook(struct nf_hook_ops *reg);
	102	void nf_unregister_hook(struct nf_hook_ops *reg);
	103	int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
	104	void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);
	105
	106	/* Functions to register get/setsockopt ranges (non-inclusive). You
	107	need to check permissions yourself! */
	108	int nf_register_sockopt(struct nf_sockopt_ops *reg);
	109	void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
	110
	111	extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
	112
	113	#ifdef HAVE_JUMP_LABEL
	114	extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
	115
	116	static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook)
	117	{
	118	if (__builtin_constant_p(pf) &&
	119	__builtin_constant_p(hook))
	120	return static_key_false(&nf_hooks_needed[pf][hook]);
	121
	122	return !list_empty(&nf_hooks[pf][hook]);
	123	}
	124	#else
	125	static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook)
	126	{
	127	return !list_empty(&nf_hooks[pf][hook]);
	128	}
	129	#endif
	130
	131	int nf_hook_slow(struct sk_buff skb, struct nf_hook_state state);
	132
	133	/**
	134	* nf_hook_thresh - call a netfilter hook
	135	*
	136	* Returns 1 if the hook has allowed the packet to pass. The function
	137	* okfn must be invoked by the caller in this case. Any other return
	138	* value indicates the packet has been consumed by the hook.
	139	*/
	140	static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
	141	struct sk_buff *skb,
	142	struct net_device *indev,
	143	struct net_device *outdev,
	144	int (okfn)(struct sk_buff ), int thresh)
	145	{
	146	if (nf_hooks_active(pf, hook)) {
	147	struct nf_hook_state state = {
	148	.hook = hook,
	149	.thresh = thresh,
	150	.pf = pf,
	151	.in = indev,
	152	.out = outdev,
	153	.okfn = okfn
	154	};
	155
	156	return nf_hook_slow(skb, &state);
	157	}
	158	return 1;
	159	}
	160
	161	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
	162	struct net_device indev, struct net_device outdev,
	163	int (okfn)(struct sk_buff ))
	164	{
	165	return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN);
	166	}
	167
	168	/* Activate hook; either okfn or kfree_skb called, unless a hook
	169	returns NF_STOLEN (in which case, it's up to the hook to deal with
	170	the consequences).
	171
	172	Returns -ERRNO if packet dropped. Zero means queued, stolen or
	173	accepted.
	174	*/
	175
	176	/* RR:
	177	> I don't want nf_hook to return anything because people might forget
	178	> about async and trust the return value to mean "packet was ok".
	179
	180	AK:
	181	Just document it clearly, then you can expect some sense from kernel
	182	coders :)
	183	*/
	184
	185	static inline int
	186	NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	187	struct net_device in, struct net_device out,
	188	int (okfn)(struct sk_buff ), int thresh)
	189	{
	190	int ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, thresh);
	191	if (ret == 1)
	192	ret = okfn(skb);
	193	return ret;
	194	}
	195
	196	static inline int
	197	NF_HOOK_COND(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	198	struct net_device in, struct net_device out,
	199	int (okfn)(struct sk_buff ), bool cond)
	200	{
	201	int ret;
	202
	203	if (!cond \|\|
	204	((ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, INT_MIN)) == 1))
	205	ret = okfn(skb);
	206	return ret;
	207	}
	208
	209	static inline int
	210	NF_HOOK(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	211	struct net_device in, struct net_device out,
	212	int (okfn)(struct sk_buff ))
	213	{
	214	return NF_HOOK_THRESH(pf, hook, skb, in, out, okfn, INT_MIN);
	215	}
	216
	217	/* Call setsockopt() */
	218	int nf_setsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
	219	unsigned int len);
	220	int nf_getsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
	221	int *len);
	222	#ifdef CONFIG_COMPAT
	223	int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval,
	224	char __user *opt, unsigned int len);
	225	int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval,
	226	char __user opt, int len);
	227	#endif
	228
	229	/* Call this before modifying an existing packet: ensures it is
	230	modifiable and linear to the point you care about (writable_len).
	231	Returns true or false. */
	232	int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);
	233
	234	struct flowi;
	235	struct nf_queue_entry;
	236
	237	struct nf_afinfo {
	238	unsigned short family;
	239	__sum16 (checksum)(struct sk_buff skb, unsigned int hook,
	240	unsigned int dataoff, u_int8_t protocol);
	241	__sum16 (checksum_partial)(struct sk_buff skb,
	242	unsigned int hook,
	243	unsigned int dataoff,
	244	unsigned int len,
	245	u_int8_t protocol);
	246	int (route)(struct net net, struct dst_entry **dst,
	247	struct flowi *fl, bool strict);
	248	void (saveroute)(const struct sk_buff skb,
	249	struct nf_queue_entry *entry);
	250	int (reroute)(struct sk_buff skb,
	251	const struct nf_queue_entry *entry);
	252	int route_key_size;
	253	};
	254
	255	extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO];
	256	static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
	257	{
	258	return rcu_dereference(nf_afinfo[family]);
	259	}
	260
	261	static inline __sum16
	262	nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
	263	u_int8_t protocol, unsigned short family)
	264	{
	265	const struct nf_afinfo *afinfo;
	266	__sum16 csum = 0;
	267
	268	rcu_read_lock();
	269	afinfo = nf_get_afinfo(family);
	270	if (afinfo)
	271	csum = afinfo->checksum(skb, hook, dataoff, protocol);
	272	rcu_read_unlock();
	273	return csum;
	274	}
	275
	276	static inline __sum16
	277	nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
	278	unsigned int dataoff, unsigned int len,
	279	u_int8_t protocol, unsigned short family)
	280	{
	281	const struct nf_afinfo *afinfo;
	282	__sum16 csum = 0;
	283
	284	rcu_read_lock();
	285	afinfo = nf_get_afinfo(family);
	286	if (afinfo)
	287	csum = afinfo->checksum_partial(skb, hook, dataoff, len,
	288	protocol);
	289	rcu_read_unlock();
	290	return csum;
	291	}
	292
	293	int nf_register_afinfo(const struct nf_afinfo *afinfo);
	294	void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
	295
	296	#include <net/flow.h>
	297	extern void (nf_nat_decode_session_hook)(struct sk_buff , struct flowi *);
	298
	299	static inline void
	300	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
	301	{
	302	#ifdef CONFIG_NF_NAT_NEEDED
	303	void (decodefn)(struct sk_buff , struct flowi *);
	304
	305	rcu_read_lock();
	306	decodefn = rcu_dereference(nf_nat_decode_session_hook);
	307	if (decodefn)
	308	decodefn(skb, fl);
	309	rcu_read_unlock();
	310	#endif
	311	}
	312
	313	#else /* !CONFIG_NETFILTER */
	314	#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb)
	315	#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb)
	316	static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
	317	struct sk_buff *skb,
	318	struct net_device *indev,
	319	struct net_device *outdev,
	320	int (okfn)(struct sk_buff ), int thresh)
	321	{
	322	return okfn(skb);
	323	}
	324	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
	325	struct net_device indev, struct net_device outdev,
	326	int (okfn)(struct sk_buff ))
	327	{
	328	return 1;
	329	}
	330	struct flowi;
	331	static inline void
	332	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
	333	{
	334	}
	335	#endif /CONFIG_NETFILTER/
	336
	337	#if defined(CONFIG_NF_CONNTRACK) \|\| defined(CONFIG_NF_CONNTRACK_MODULE)
	338	extern void (ip_ct_attach)(struct sk_buff , const struct sk_buff *) __rcu;
	339	void nf_ct_attach(struct sk_buff , const struct sk_buff );
	340	extern void (nf_ct_destroy)(struct nf_conntrack ) __rcu;
	341
	342	struct nf_conn;
	343	enum ip_conntrack_info;
	344	struct nlattr;
	345
	346	struct nfq_ct_hook {
	347	size_t (build_size)(const struct nf_conn ct);
	348	int (build)(struct sk_buff skb, struct nf_conn *ct);
	349	int (parse)(const struct nlattr attr, struct nf_conn *ct);
	350	int (attach_expect)(const struct nlattr attr, struct nf_conn *ct,
	351	u32 portid, u32 report);
	352	void (seq_adjust)(struct sk_buff skb, struct nf_conn *ct,
	353	enum ip_conntrack_info ctinfo, s32 off);
	354	};
	355	extern struct nfq_ct_hook __rcu *nfq_ct_hook;
	356	#else
	357	static inline void nf_ct_attach(struct sk_buff new, struct sk_buff skb) {}
	358	#endif
	359
	360	#endif /__LINUX_NETFILTER_H/