[linux-2.6-block.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)

/* 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);
	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[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,
				 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(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, 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, u_int8_t pf, int optval, char __user *opt,
		  int len);
int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt,
		  int *len);

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