[net-next-2.6.git] / include / linux / netfilter.h

#ifndef __LINUX_NETFILTER_H
#define __LINUX_NETFILTER_H

#ifdef __KERNEL__
#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>
#endif
#include <linux/types.h>
#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_BITS) & NF_VERDICT_QMASK) | NF_QUEUE)

#define NF_DROP_ERR(x) (((-x) << NF_VERDICT_BITS) | NF_DROP)

/* 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
};

enum {
	NFPROTO_UNSPEC =  0,
	NFPROTO_IPV4   =  2,
	NFPROTO_ARP    =  3,
	NFPROTO_BRIDGE =  7,
	NFPROTO_IPV6   = 10,
	NFPROTO_DECNET = 12,
	NFPROTO_NUMPROTO,
};

union nf_inet_addr {
	__u32		all[4];
	__be32		ip;
	__be32		ip6[4];
	struct in_addr	in;
	struct in6_addr	in6;
};

#ifdef __KERNEL__
#ifdef CONFIG_NETFILTER

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];
}

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);

#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[NFPROTO_NUMPROTO][NF_MAX_HOOKS];

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)
{
#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(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 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[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 (*ip_nat_decode_session)(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 *);

	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(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 *);
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>
1da177e4 LT	6	#include <linux/skbuff.h>
	7	#include <linux/net.h>
	8	#include <linux/if.h>
2e3075a2 JE	9	#include <linux/in.h>
2e3075a2 JE	10	#include <linux/in6.h>
1da177e4 LT	11	#include <linux/wait.h>
	12	#include <linux/list.h>
	13	#endif
c8942f1f	14	#include <linux/types.h>
1da177e4 LT	15	#include <linux/compiler.h>
	16
	17	/* Responses from hook functions. */
	18	#define NF_DROP 0
	19	#define NF_ACCEPT 1
	20	#define NF_STOLEN 2
	21	#define NF_QUEUE 3
	22	#define NF_REPEAT 4
	23	#define NF_STOP 5
	24	#define NF_MAX_VERDICT NF_STOP
	25
0ab43f84 HW	26	/* we overload the higher bits for encoding auxiliary data such as the queue
	27	* number. Not nice, but better than additional function arguments. */
	28	#define NF_VERDICT_MASK 0x0000ffff
	29	#define NF_VERDICT_BITS 16
	30
	31	#define NF_VERDICT_QMASK 0xffff0000
	32	#define NF_VERDICT_QBITS 16
	33
fbabbed8	34	#define NF_QUEUE_NR(x) ((((x) << NF_VERDICT_BITS) & NF_VERDICT_QMASK) \| NF_QUEUE)
0ab43f84	35
da683650 EP	36	#define NF_DROP_ERR(x) (((-x) << NF_VERDICT_BITS) \| NF_DROP)
da683650 EP	37
6869c4d8 HW	38	/* only for userspace compatibility */
6869c4d8 HW	39	#ifndef __KERNEL__
1da177e4 LT	40	/* Generic cache responses from hook functions.
	41	<= 0x2000 is used for protocol-flags. */
	42	#define NFC_UNKNOWN 0x4000
	43	#define NFC_ALTERED 0x8000
6869c4d8	44	#endif
1da177e4	45
6e23ae2a PM	46	enum nf_inet_hooks {
	47	NF_INET_PRE_ROUTING,
	48	NF_INET_LOCAL_IN,
	49	NF_INET_FORWARD,
	50	NF_INET_LOCAL_OUT,
	51	NF_INET_POST_ROUTING,
	52	NF_INET_NUMHOOKS
	53	};
	54
7e9c6eeb JE	55	enum {
	56	NFPROTO_UNSPEC = 0,
	57	NFPROTO_IPV4 = 2,
	58	NFPROTO_ARP = 3,
	59	NFPROTO_BRIDGE = 7,
	60	NFPROTO_IPV6 = 10,
	61	NFPROTO_DECNET = 12,
	62	NFPROTO_NUMPROTO,
	63	};
	64
643a2c15	65	union nf_inet_addr {
7b33ed22	66	__u32 all[4];
643a2c15 JE	67	__be32 ip;
643a2c15 JE	68	__be32 ip6[4];
2e3075a2 JE	69	struct in_addr in;
2e3075a2 JE	70	struct in6_addr in6;
643a2c15 JE	71	};
643a2c15 JE	72
1da177e4	73	#ifdef __KERNEL__
1da177e4 LT	74	#ifdef CONFIG_NETFILTER
1da177e4 LT	75
b8beedd2 PM	76	static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1,
	77	const union nf_inet_addr *a2)
	78	{
	79	return a1->all[0] == a2->all[0] &&
	80	a1->all[1] == a2->all[1] &&
	81	a1->all[2] == a2->all[2] &&
	82	a1->all[3] == a2->all[3];
	83	}
	84
1da177e4 LT	85	extern void netfilter_init(void);
	86
	87	/* Largest hook number + 1 */
	88	#define NF_MAX_HOOKS 8
	89
	90	struct sk_buff;
1da177e4 LT	91
1da177e4 LT	92	typedef unsigned int nf_hookfn(unsigned int hooknum,
3db05fea	93	struct sk_buff *skb,
1da177e4 LT	94	const struct net_device *in,
	95	const struct net_device *out,
	96	int (okfn)(struct sk_buff ));
	97
d94d9fee	98	struct nf_hook_ops {
1da177e4 LT	99	struct list_head list;
	100
	101	/* User fills in from here down. */
	102	nf_hookfn *hook;
	103	struct module *owner;
76108cea JE	104	u_int8_t pf;
76108cea JE	105	unsigned int hooknum;
1da177e4 LT	106	/* Hooks are ordered in ascending priority. */
	107	int priority;
	108	};
	109
d94d9fee	110	struct nf_sockopt_ops {
1da177e4 LT	111	struct list_head list;
1da177e4 LT	112
76108cea	113	u_int8_t pf;
1da177e4 LT	114
	115	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
	116	int set_optmin;
	117	int set_optmax;
	118	int (set)(struct sock sk, int optval, void __user *user, unsigned int len);
c30f540b	119	#ifdef CONFIG_COMPAT
3fdadf7d DM	120	int (compat_set)(struct sock sk, int optval,
3fdadf7d DM	121	void __user *user, unsigned int len);
c30f540b	122	#endif
1da177e4 LT	123	int get_optmin;
	124	int get_optmax;
	125	int (get)(struct sock sk, int optval, void __user user, int len);
c30f540b	126	#ifdef CONFIG_COMPAT
3fdadf7d DM	127	int (compat_get)(struct sock sk, int optval,
3fdadf7d DM	128	void __user user, int len);
c30f540b	129	#endif
16fcec35 NH	130	/* Use the module struct to lock set/get code in place */
16fcec35 NH	131	struct module *owner;
1da177e4 LT	132	};
1da177e4 LT	133
1da177e4 LT	134	/* Function to register/unregister hook points. */
	135	int nf_register_hook(struct nf_hook_ops *reg);
	136	void nf_unregister_hook(struct nf_hook_ops *reg);
972d1cb1 PM	137	int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
972d1cb1 PM	138	void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);
1da177e4 LT	139
	140	/* Functions to register get/setsockopt ranges (non-inclusive). You
	141	need to check permissions yourself! */
	142	int nf_register_sockopt(struct nf_sockopt_ops *reg);
	143	void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
	144
d62f9ed4 PM	145	#ifdef CONFIG_SYSCTL
d62f9ed4 PM	146	/* Sysctl registration */
b3fd3ffe PE	147	extern struct ctl_path nf_net_netfilter_sysctl_path[];
b3fd3ffe PE	148	extern struct ctl_path nf_net_ipv4_netfilter_sysctl_path[];
d62f9ed4 PM	149	#endif /* CONFIG_SYSCTL */
d62f9ed4 PM	150
7e9c6eeb	151	extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
1da177e4	152
76108cea	153	int nf_hook_slow(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
16a6677f PM	154	struct net_device indev, struct net_device outdev,
	155	int (okfn)(struct sk_buff ), int thresh);
	156
	157	/**
	158	* nf_hook_thresh - call a netfilter hook
	159	*
	160	* Returns 1 if the hook has allowed the packet to pass. The function
	161	* okfn must be invoked by the caller in this case. Any other return
	162	* value indicates the packet has been consumed by the hook.
	163	*/
76108cea	164	static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
3db05fea	165	struct sk_buff *skb,
16a6677f PM	166	struct net_device *indev,
16a6677f PM	167	struct net_device *outdev,
23f3733d	168	int (okfn)(struct sk_buff ), int thresh)
16a6677f PM	169	{
	170	#ifndef CONFIG_NETFILTER_DEBUG
	171	if (list_empty(&nf_hooks[pf][hook]))
	172	return 1;
	173	#endif
3db05fea	174	return nf_hook_slow(pf, hook, skb, indev, outdev, okfn, thresh);
16a6677f PM	175	}
16a6677f PM	176
76108cea	177	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
16a6677f PM	178	struct net_device indev, struct net_device outdev,
	179	int (okfn)(struct sk_buff ))
	180	{
23f3733d	181	return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN);
16a6677f	182	}
1da177e4 LT	183
	184	/* Activate hook; either okfn or kfree_skb called, unless a hook
	185	returns NF_STOLEN (in which case, it's up to the hook to deal with
	186	the consequences).
	187
	188	Returns -ERRNO if packet dropped. Zero means queued, stolen or
	189	accepted.
	190	*/
	191
	192	/* RR:
	193	> I don't want nf_hook to return anything because people might forget
	194	> about async and trust the return value to mean "packet was ok".
	195
	196	AK:
	197	Just document it clearly, then you can expect some sense from kernel
	198	coders :)
	199	*/
	200
2249065f JE	201	static inline int
	202	NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	203	struct net_device in, struct net_device out,
	204	int (okfn)(struct sk_buff ), int thresh)
	205	{
	206	int ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, thresh);
	207	if (ret == 1)
	208	ret = okfn(skb);
	209	return ret;
	210	}
48d5cad8	211
2249065f JE	212	static inline int
	213	NF_HOOK_COND(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	214	struct net_device in, struct net_device out,
	215	int (okfn)(struct sk_buff ), bool cond)
	216	{
4bac6b18 PM	217	int ret;
	218
	219	if (!cond \|\|
ac5aa2e3	220	((ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, INT_MIN)) == 1))
2249065f JE	221	ret = okfn(skb);
	222	return ret;
	223	}
1da177e4	224
2249065f JE	225	static inline int
	226	NF_HOOK(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	227	struct net_device in, struct net_device out,
	228	int (okfn)(struct sk_buff ))
	229	{
	230	return NF_HOOK_THRESH(pf, hook, skb, in, out, okfn, INT_MIN);
	231	}
1da177e4 LT	232
1da177e4 LT	233	/* Call setsockopt() */
76108cea	234	int nf_setsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
b7058842	235	unsigned int len);
76108cea	236	int nf_getsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
1da177e4	237	int *len);
c30f540b	238	#ifdef CONFIG_COMPAT
76108cea	239	int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval,
b7058842	240	char __user *opt, unsigned int len);
76108cea	241	int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval,
3fdadf7d	242	char __user opt, int len);
c30f540b	243	#endif
3fdadf7d	244
089af26c HW	245	/* Call this before modifying an existing packet: ensures it is
	246	modifiable and linear to the point you care about (writable_len).
	247	Returns true or false. */
37d41879	248	extern int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);
089af26c	249
1841a4c7	250	struct flowi;
02f014d8	251	struct nf_queue_entry;
c01cd429	252
bce8032e PM	253	struct nf_afinfo {
bce8032e PM	254	unsigned short family;
b51655b9	255	__sum16 (checksum)(struct sk_buff skb, unsigned int hook,
422c346f	256	unsigned int dataoff, u_int8_t protocol);
d63a6507 PM	257	__sum16 (checksum_partial)(struct sk_buff skb,
	258	unsigned int hook,
	259	unsigned int dataoff,
	260	unsigned int len,
	261	u_int8_t protocol);
1841a4c7	262	int (route)(struct dst_entry dst, struct flowi fl);
bce8032e	263	void (saveroute)(const struct sk_buff skb,
02f014d8	264	struct nf_queue_entry *entry);
3db05fea	265	int (reroute)(struct sk_buff skb,
02f014d8	266	const struct nf_queue_entry *entry);
bce8032e	267	int route_key_size;
2cc7d573 HW	268	};
2cc7d573 HW	269
7e9c6eeb	270	extern const struct nf_afinfo *nf_afinfo[NFPROTO_NUMPROTO];
1e796fda	271	static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
bce8032e PM	272	{
	273	return rcu_dereference(nf_afinfo[family]);
	274	}
2cc7d573	275
b51655b9	276	static inline __sum16
422c346f PM	277	nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
	278	u_int8_t protocol, unsigned short family)
	279	{
1e796fda	280	const struct nf_afinfo *afinfo;
b51655b9	281	__sum16 csum = 0;
422c346f PM	282
	283	rcu_read_lock();
	284	afinfo = nf_get_afinfo(family);
	285	if (afinfo)
	286	csum = afinfo->checksum(skb, hook, dataoff, protocol);
	287	rcu_read_unlock();
	288	return csum;
	289	}
	290
d63a6507 PM	291	static inline __sum16
	292	nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
	293	unsigned int dataoff, unsigned int len,
	294	u_int8_t protocol, unsigned short family)
	295	{
	296	const struct nf_afinfo *afinfo;
	297	__sum16 csum = 0;
	298
	299	rcu_read_lock();
	300	afinfo = nf_get_afinfo(family);
	301	if (afinfo)
	302	csum = afinfo->checksum_partial(skb, hook, dataoff, len,
	303	protocol);
	304	rcu_read_unlock();
	305	return csum;
	306	}
	307
1e796fda PM	308	extern int nf_register_afinfo(const struct nf_afinfo *afinfo);
1e796fda PM	309	extern void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
bce8032e	310
eb9c7ebe PM	311	#include <net/flow.h>
	312	extern void (ip_nat_decode_session)(struct sk_buff , struct flowi *);
	313
	314	static inline void
76108cea	315	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
eb9c7ebe	316	{
051578cc	317	#ifdef CONFIG_NF_NAT_NEEDED
eb9c7ebe PM	318	void (decodefn)(struct sk_buff , struct flowi *);
eb9c7ebe PM	319
051578cc PM	320	if (family == AF_INET) {
	321	rcu_read_lock();
	322	decodefn = rcu_dereference(ip_nat_decode_session);
	323	if (decodefn)
	324	decodefn(skb, fl);
	325	rcu_read_unlock();
	326	}
eb9c7ebe PM	327	#endif
	328	}
	329
608c8e4f HW	330	#ifdef CONFIG_PROC_FS
	331	#include <linux/proc_fs.h>
	332	extern struct proc_dir_entry *proc_net_netfilter;
	333	#endif
	334
1da177e4 LT	335	#else /* !CONFIG_NETFILTER */
1da177e4 LT	336	#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb)
48d5cad8	337	#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb)
76108cea	338	static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
3db05fea	339	struct sk_buff *skb,
f53b61d8 DM	340	struct net_device *indev,
f53b61d8 DM	341	struct net_device *outdev,
23f3733d	342	int (okfn)(struct sk_buff ), int thresh)
f53b61d8	343	{
3db05fea	344	return okfn(skb);
f53b61d8	345	}
76108cea	346	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
f53b61d8 DM	347	struct net_device indev, struct net_device outdev,
	348	int (okfn)(struct sk_buff ))
	349	{
9c92d348	350	return 1;
f53b61d8	351	}
f53b61d8	352	struct flowi;
eb9c7ebe	353	static inline void
76108cea JE	354	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
	355	{
	356	}
1da177e4 LT	357	#endif /CONFIG_NETFILTER/
1da177e4 LT	358
5f79e0f9 YK	359	#if defined(CONFIG_NF_CONNTRACK) \|\| defined(CONFIG_NF_CONNTRACK_MODULE)
	360	extern void (ip_ct_attach)(struct sk_buff , struct sk_buff *);
	361	extern void nf_ct_attach(struct sk_buff , struct sk_buff );
de6e05c4	362	extern void (nf_ct_destroy)(struct nf_conntrack );
5f79e0f9 YK	363	#else
	364	static inline void nf_ct_attach(struct sk_buff new, struct sk_buff skb) {}
	365	#endif
	366
1da177e4 LT	367	#endif /__KERNEL__/
1da177e4 LT	368	#endif /__LINUX_NETFILTER_H/