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

#ifndef __LINUX_NETFILTER_H
#define __LINUX_NETFILTER_H

#ifdef __KERNEL__
#include <linux/init.h>
#include <linux/types.h>
#include <linux/skbuff.h>
#include <linux/net.h>
#include <linux/if.h>
#include <linux/wait.h>
#include <linux/list.h>
#endif
#include <linux/compiler.h>

/* Responses from hook functions. */
#define NF_DROP 0
#define NF_ACCEPT 1
#define NF_STOLEN 2
#define NF_QUEUE 3
#define NF_REPEAT 4
#define NF_STOP 5
#define NF_MAX_VERDICT NF_STOP

/* we overload the higher bits for encoding auxiliary data such as the queue
 * number. Not nice, but better than additional function arguments. */
#define NF_VERDICT_MASK 0x0000ffff
#define NF_VERDICT_BITS 16

#define NF_VERDICT_QMASK 0xffff0000
#define NF_VERDICT_QBITS 16

#define NF_QUEUE_NR(x) (((x << NF_VERDICT_QBITS) & NF_VERDICT_QMASK) | NF_QUEUE)

/* only for userspace compatibility */
#ifndef __KERNEL__
/* Generic cache responses from hook functions.
   <= 0x2000 is used for protocol-flags. */
#define NFC_UNKNOWN 0x4000
#define NFC_ALTERED 0x8000
#endif

enum nf_inet_hooks {
	NF_INET_PRE_ROUTING,
	NF_INET_LOCAL_IN,
	NF_INET_FORWARD,
	NF_INET_LOCAL_OUT,
	NF_INET_POST_ROUTING,
	NF_INET_NUMHOOKS
};

union nf_inet_addr {
	u_int32_t	all[4];
	__be32		ip;
	__be32		ip6[4];
};

#ifdef __KERNEL__
#ifdef CONFIG_NETFILTER

extern void netfilter_init(void);

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

struct sk_buff;
struct net_device;

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;
	int pf;
	int hooknum;
	/* Hooks are ordered in ascending priority. */
	int priority;
};

struct nf_sockopt_ops
{
	struct list_head list;

	int 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);
	int (*compat_set)(struct sock *sk, int optval,
			void __user *user, unsigned int len);

	int get_optmin;
	int get_optmax;
	int (*get)(struct sock *sk, int optval, void __user *user, int *len);
	int (*compat_get)(struct sock *sk, int optval,
			void __user *user, int *len);

	/* 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);

#ifdef CONFIG_SYSCTL
/* Sysctl registration */
extern struct ctl_path nf_net_netfilter_sysctl_path[];
extern struct ctl_path nf_net_ipv4_netfilter_sysctl_path[];
#endif /* CONFIG_SYSCTL */

extern struct list_head nf_hooks[NPROTO][NF_MAX_HOOKS];

int nf_hook_slow(int 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(int pf, unsigned int hook,
				 struct sk_buff *skb,
				 struct net_device *indev,
				 struct net_device *outdev,
				 int (*okfn)(struct sk_buff *), int thresh,
				 int cond)
{
	if (!cond)
		return 1;
#ifndef CONFIG_NETFILTER_DEBUG
	if (list_empty(&nf_hooks[pf][hook]))
		return 1;
#endif
	return nf_hook_slow(pf, hook, skb, indev, outdev, okfn, thresh);
}

static inline int nf_hook(int 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, 1);
}
                   
/* 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 :)
*/

/* This is gross, but inline doesn't cut it for avoiding the function
   call in fast path: gcc doesn't inline (needs value tracking?). --RR */

/* HX: It's slightly less gross now. */

#define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh)	       \
({int __ret;								       \
if ((__ret=nf_hook_thresh(pf, hook, (skb), indev, outdev, okfn, thresh, 1)) == 1)\
	__ret = (okfn)(skb);						       \
__ret;})

#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond)		       \
({int __ret;								       \
if ((__ret=nf_hook_thresh(pf, hook, (skb), indev, outdev, okfn, INT_MIN, cond)) == 1)\
	__ret = (okfn)(skb);						       \
__ret;})

#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) \
	NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, INT_MIN)

/* Call setsockopt() */
int nf_setsockopt(struct sock *sk, int pf, int optval, char __user *opt, 
		  int len);
int nf_getsockopt(struct sock *sk, int pf, int optval, char __user *opt,
		  int *len);

int compat_nf_setsockopt(struct sock *sk, int pf, int optval,
		char __user *opt, int len);
int compat_nf_getsockopt(struct sock *sk, int pf, int optval,
		char __user *opt, int *len);

/* 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);
	int		(*route)(struct dst_entry **dst, struct flowi *fl);
	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 *nf_afinfo[NPROTO];
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;
}

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 (*ip_nat_decode_session)(struct sk_buff *, struct flowi *);

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

	if (family == AF_INET) {
		rcu_read_lock();
		decodefn = rcu_dereference(ip_nat_decode_session);
		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(int pf, unsigned int hook,
				 struct sk_buff *skb,
				 struct net_device *indev,
				 struct net_device *outdev,
				 int (*okfn)(struct sk_buff *), int thresh,
				 int cond)
{
	return okfn(skb);
}
static inline int nf_hook(int 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, int 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 *);
extern void nf_ct_attach(struct sk_buff *, struct sk_buff *);
extern void (*nf_ct_destroy)(struct nf_conntrack *);
#else
static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {}
#endif

#endif /*__KERNEL__*/
#endif /*__LINUX_NETFILTER_H*/
Commit	Line	Data
1da177e4 LT	1	#ifndef __LINUX_NETFILTER_H
	2	#define __LINUX_NETFILTER_H
	3
	4	#ifdef __KERNEL__
	5	#include <linux/init.h>
	6	#include <linux/types.h>
	7	#include <linux/skbuff.h>
	8	#include <linux/net.h>
	9	#include <linux/if.h>
	10	#include <linux/wait.h>
	11	#include <linux/list.h>
	12	#endif
	13	#include <linux/compiler.h>
	14
	15	/* Responses from hook functions. */
	16	#define NF_DROP 0
	17	#define NF_ACCEPT 1
	18	#define NF_STOLEN 2
	19	#define NF_QUEUE 3
	20	#define NF_REPEAT 4
	21	#define NF_STOP 5
	22	#define NF_MAX_VERDICT NF_STOP
	23
0ab43f84 HW	24	/* we overload the higher bits for encoding auxiliary data such as the queue
	25	* number. Not nice, but better than additional function arguments. */
	26	#define NF_VERDICT_MASK 0x0000ffff
	27	#define NF_VERDICT_BITS 16
	28
	29	#define NF_VERDICT_QMASK 0xffff0000
	30	#define NF_VERDICT_QBITS 16
	31
b766b305	32	#define NF_QUEUE_NR(x) (((x << NF_VERDICT_QBITS) & NF_VERDICT_QMASK) \| NF_QUEUE)
0ab43f84	33
6869c4d8 HW	34	/* only for userspace compatibility */
6869c4d8 HW	35	#ifndef __KERNEL__
1da177e4 LT	36	/* Generic cache responses from hook functions.
	37	<= 0x2000 is used for protocol-flags. */
	38	#define NFC_UNKNOWN 0x4000
	39	#define NFC_ALTERED 0x8000
6869c4d8	40	#endif
1da177e4	41
6e23ae2a PM	42	enum nf_inet_hooks {
	43	NF_INET_PRE_ROUTING,
	44	NF_INET_LOCAL_IN,
	45	NF_INET_FORWARD,
	46	NF_INET_LOCAL_OUT,
	47	NF_INET_POST_ROUTING,
	48	NF_INET_NUMHOOKS
	49	};
	50
643a2c15 JE	51	union nf_inet_addr {
	52	u_int32_t all[4];
	53	__be32 ip;
	54	__be32 ip6[4];
	55	};
	56
1da177e4	57	#ifdef __KERNEL__
1da177e4 LT	58	#ifdef CONFIG_NETFILTER
	59
	60	extern void netfilter_init(void);
	61
	62	/* Largest hook number + 1 */
	63	#define NF_MAX_HOOKS 8
	64
	65	struct sk_buff;
	66	struct net_device;
	67
	68	typedef unsigned int nf_hookfn(unsigned int hooknum,
3db05fea	69	struct sk_buff *skb,
1da177e4 LT	70	const struct net_device *in,
	71	const struct net_device *out,
	72	int (okfn)(struct sk_buff ));
	73
	74	struct nf_hook_ops
	75	{
	76	struct list_head list;
	77
	78	/* User fills in from here down. */
	79	nf_hookfn *hook;
	80	struct module *owner;
	81	int pf;
	82	int hooknum;
	83	/* Hooks are ordered in ascending priority. */
	84	int priority;
	85	};
	86
	87	struct nf_sockopt_ops
	88	{
	89	struct list_head list;
	90
	91	int pf;
	92
	93	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
	94	int set_optmin;
	95	int set_optmax;
	96	int (set)(struct sock sk, int optval, void __user *user, unsigned int len);
3fdadf7d DM	97	int (compat_set)(struct sock sk, int optval,
3fdadf7d DM	98	void __user *user, unsigned int len);
1da177e4 LT	99
	100	int get_optmin;
	101	int get_optmax;
	102	int (get)(struct sock sk, int optval, void __user user, int len);
3fdadf7d DM	103	int (compat_get)(struct sock sk, int optval,
3fdadf7d DM	104	void __user user, int len);
1da177e4	105
16fcec35 NH	106	/* Use the module struct to lock set/get code in place */
16fcec35 NH	107	struct module *owner;
1da177e4 LT	108	};
1da177e4 LT	109
1da177e4 LT	110	/* Function to register/unregister hook points. */
	111	int nf_register_hook(struct nf_hook_ops *reg);
	112	void nf_unregister_hook(struct nf_hook_ops *reg);
972d1cb1 PM	113	int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
972d1cb1 PM	114	void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);
1da177e4 LT	115
	116	/* Functions to register get/setsockopt ranges (non-inclusive). You
	117	need to check permissions yourself! */
	118	int nf_register_sockopt(struct nf_sockopt_ops *reg);
	119	void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
	120
d62f9ed4 PM	121	#ifdef CONFIG_SYSCTL
d62f9ed4 PM	122	/* Sysctl registration */
b3fd3ffe PE	123	extern struct ctl_path nf_net_netfilter_sysctl_path[];
b3fd3ffe PE	124	extern struct ctl_path nf_net_ipv4_netfilter_sysctl_path[];
d62f9ed4 PM	125	#endif /* CONFIG_SYSCTL */
d62f9ed4 PM	126
1da177e4 LT	127	extern struct list_head nf_hooks[NPROTO][NF_MAX_HOOKS];
1da177e4 LT	128
3db05fea	129	int nf_hook_slow(int pf, unsigned int hook, struct sk_buff *skb,
16a6677f PM	130	struct net_device indev, struct net_device outdev,
	131	int (okfn)(struct sk_buff ), int thresh);
	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(int pf, unsigned int hook,
3db05fea	141	struct sk_buff *skb,
16a6677f PM	142	struct net_device *indev,
16a6677f PM	143	struct net_device *outdev,
48d5cad8 PM	144	int (okfn)(struct sk_buff ), int thresh,
48d5cad8 PM	145	int cond)
16a6677f	146	{
48d5cad8 PM	147	if (!cond)
48d5cad8 PM	148	return 1;
16a6677f PM	149	#ifndef CONFIG_NETFILTER_DEBUG
	150	if (list_empty(&nf_hooks[pf][hook]))
	151	return 1;
	152	#endif
3db05fea	153	return nf_hook_slow(pf, hook, skb, indev, outdev, okfn, thresh);
16a6677f PM	154	}
16a6677f PM	155
3db05fea	156	static inline int nf_hook(int pf, unsigned int hook, struct sk_buff *skb,
16a6677f PM	157	struct net_device indev, struct net_device outdev,
	158	int (okfn)(struct sk_buff ))
	159	{
3db05fea	160	return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN, 1);
16a6677f	161	}
1da177e4 LT	162
	163	/* Activate hook; either okfn or kfree_skb called, unless a hook
	164	returns NF_STOLEN (in which case, it's up to the hook to deal with
	165	the consequences).
	166
	167	Returns -ERRNO if packet dropped. Zero means queued, stolen or
	168	accepted.
	169	*/
	170
	171	/* RR:
	172	> I don't want nf_hook to return anything because people might forget
	173	> about async and trust the return value to mean "packet was ok".
	174
	175	AK:
	176	Just document it clearly, then you can expect some sense from kernel
	177	coders :)
	178	*/
	179
	180	/* This is gross, but inline doesn't cut it for avoiding the function
	181	call in fast path: gcc doesn't inline (needs value tracking?). --RR */
16a6677f PM	182
	183	/* HX: It's slightly less gross now. */
	184
1da177e4 LT	185	#define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh) \
1da177e4 LT	186	({int __ret; \
3db05fea	187	if ((__ret=nf_hook_thresh(pf, hook, (skb), indev, outdev, okfn, thresh, 1)) == 1)\
48d5cad8 PM	188	__ret = (okfn)(skb); \
	189	__ret;})
	190
	191	#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) \
	192	({int __ret; \
3db05fea	193	if ((__ret=nf_hook_thresh(pf, hook, (skb), indev, outdev, okfn, INT_MIN, cond)) == 1)\
1da177e4 LT	194	__ret = (okfn)(skb); \
1da177e4 LT	195	__ret;})
1da177e4	196
16a6677f PM	197	#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) \
16a6677f PM	198	NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, INT_MIN)
1da177e4 LT	199
	200	/* Call setsockopt() */
	201	int nf_setsockopt(struct sock sk, int pf, int optval, char __user opt,
	202	int len);
	203	int nf_getsockopt(struct sock sk, int pf, int optval, char __user opt,
	204	int *len);
	205
3fdadf7d DM	206	int compat_nf_setsockopt(struct sock *sk, int pf, int optval,
	207	char __user *opt, int len);
	208	int compat_nf_getsockopt(struct sock *sk, int pf, int optval,
	209	char __user opt, int len);
	210
089af26c HW	211	/* Call this before modifying an existing packet: ensures it is
	212	modifiable and linear to the point you care about (writable_len).
	213	Returns true or false. */
37d41879	214	extern int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);
089af26c	215
1841a4c7	216	struct flowi;
02f014d8	217	struct nf_queue_entry;
c01cd429	218
bce8032e PM	219	struct nf_afinfo {
bce8032e PM	220	unsigned short family;
b51655b9	221	__sum16 (checksum)(struct sk_buff skb, unsigned int hook,
422c346f	222	unsigned int dataoff, u_int8_t protocol);
1841a4c7	223	int (route)(struct dst_entry dst, struct flowi fl);
bce8032e	224	void (saveroute)(const struct sk_buff skb,
02f014d8	225	struct nf_queue_entry *entry);
3db05fea	226	int (reroute)(struct sk_buff skb,
02f014d8	227	const struct nf_queue_entry *entry);
bce8032e	228	int route_key_size;
2cc7d573 HW	229	};
2cc7d573 HW	230
1e796fda PM	231	extern const struct nf_afinfo *nf_afinfo[NPROTO];
1e796fda PM	232	static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
bce8032e PM	233	{
	234	return rcu_dereference(nf_afinfo[family]);
	235	}
2cc7d573	236
b51655b9	237	static inline __sum16
422c346f PM	238	nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
	239	u_int8_t protocol, unsigned short family)
	240	{
1e796fda	241	const struct nf_afinfo *afinfo;
b51655b9	242	__sum16 csum = 0;
422c346f PM	243
	244	rcu_read_lock();
	245	afinfo = nf_get_afinfo(family);
	246	if (afinfo)
	247	csum = afinfo->checksum(skb, hook, dataoff, protocol);
	248	rcu_read_unlock();
	249	return csum;
	250	}
	251
1e796fda PM	252	extern int nf_register_afinfo(const struct nf_afinfo *afinfo);
1e796fda PM	253	extern void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
bce8032e	254
eb9c7ebe PM	255	#include <net/flow.h>
	256	extern void (ip_nat_decode_session)(struct sk_buff , struct flowi *);
	257
	258	static inline void
	259	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, int family)
	260	{
051578cc	261	#ifdef CONFIG_NF_NAT_NEEDED
eb9c7ebe PM	262	void (decodefn)(struct sk_buff , struct flowi *);
eb9c7ebe PM	263
051578cc PM	264	if (family == AF_INET) {
	265	rcu_read_lock();
	266	decodefn = rcu_dereference(ip_nat_decode_session);
	267	if (decodefn)
	268	decodefn(skb, fl);
	269	rcu_read_unlock();
	270	}
eb9c7ebe PM	271	#endif
	272	}
	273
608c8e4f HW	274	#ifdef CONFIG_PROC_FS
	275	#include <linux/proc_fs.h>
	276	extern struct proc_dir_entry *proc_net_netfilter;
	277	#endif
	278
1da177e4 LT	279	#else /* !CONFIG_NETFILTER */
1da177e4 LT	280	#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb)
48d5cad8	281	#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb)
f53b61d8	282	static inline int nf_hook_thresh(int pf, unsigned int hook,
3db05fea	283	struct sk_buff *skb,
f53b61d8 DM	284	struct net_device *indev,
f53b61d8 DM	285	struct net_device *outdev,
48d5cad8 PM	286	int (okfn)(struct sk_buff ), int thresh,
48d5cad8 PM	287	int cond)
f53b61d8	288	{
3db05fea	289	return okfn(skb);
f53b61d8	290	}
3db05fea	291	static inline int nf_hook(int pf, unsigned int hook, struct sk_buff *skb,
f53b61d8 DM	292	struct net_device indev, struct net_device outdev,
	293	int (okfn)(struct sk_buff ))
	294	{
9c92d348	295	return 1;
f53b61d8	296	}
f53b61d8	297	struct flowi;
eb9c7ebe PM	298	static inline void
eb9c7ebe PM	299	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, int family) {}
1da177e4 LT	300	#endif /CONFIG_NETFILTER/
1da177e4 LT	301
5f79e0f9 YK	302	#if defined(CONFIG_NF_CONNTRACK) \|\| defined(CONFIG_NF_CONNTRACK_MODULE)
	303	extern void (ip_ct_attach)(struct sk_buff , struct sk_buff *);
	304	extern void nf_ct_attach(struct sk_buff , struct sk_buff );
de6e05c4	305	extern void (nf_ct_destroy)(struct nf_conntrack );
5f79e0f9 YK	306	#else
	307	static inline void nf_ct_attach(struct sk_buff new, struct sk_buff skb) {}
	308	#endif
	309
1da177e4 LT	310	#endif /__KERNEL__/
1da177e4 LT	311	#endif /__LINUX_NETFILTER_H/