[mirror_ubuntu-artful-kernel.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;
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(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. */
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
1da177e4 LT	1	#ifndef __LINUX_NETFILTER_H
	2	#define __LINUX_NETFILTER_H
	3
1da177e4	4	#include <linux/init.h>
1da177e4 LT	5	#include <linux/skbuff.h>
	6	#include <linux/net.h>
	7	#include <linux/if.h>
2e3075a2 JE	8	#include <linux/in.h>
2e3075a2 JE	9	#include <linux/in6.h>
1da177e4 LT	10	#include <linux/wait.h>
1da177e4 LT	11	#include <linux/list.h>
d1c85c2e	12	#include <linux/static_key.h>
607ca46e	13	#include <uapi/linux/netfilter.h>
1da177e4	14	#ifdef CONFIG_NETFILTER
f615df76 FW	15	static inline int NF_DROP_GETERR(int verdict)
	16	{
	17	return -(verdict >> NF_VERDICT_QBITS);
	18	}
1da177e4	19
b8beedd2 PM	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
efdedd54 DF	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
a0f4ecf3	39	int netfilter_init(void);
1da177e4 LT	40
	41	/* Largest hook number + 1 */
	42	#define NF_MAX_HOOKS 8
	43
	44	struct sk_buff;
1da177e4	45
795aa6ef PM	46	struct nf_hook_ops;
795aa6ef PM	47	typedef unsigned int nf_hookfn(const struct nf_hook_ops *ops,
3db05fea	48	struct sk_buff *skb,
1da177e4 LT	49	const struct net_device *in,
	50	const struct net_device *out,
	51	int (okfn)(struct sk_buff ));
	52
d94d9fee	53	struct nf_hook_ops {
1da177e4 LT	54	struct list_head list;
	55
	56	/* User fills in from here down. */
96518518 PM	57	nf_hookfn *hook;
	58	struct module *owner;
	59	void *priv;
	60	u_int8_t pf;
	61	unsigned int hooknum;
1da177e4	62	/* Hooks are ordered in ascending priority. */
96518518	63	int priority;
1da177e4 LT	64	};
1da177e4 LT	65
d94d9fee	66	struct nf_sockopt_ops {
1da177e4 LT	67	struct list_head list;
1da177e4 LT	68
76108cea	69	u_int8_t pf;
1da177e4 LT	70
	71	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
	72	int set_optmin;
	73	int set_optmax;
	74	int (set)(struct sock sk, int optval, void __user *user, unsigned int len);
c30f540b	75	#ifdef CONFIG_COMPAT
3fdadf7d DM	76	int (compat_set)(struct sock sk, int optval,
3fdadf7d DM	77	void __user *user, unsigned int len);
c30f540b	78	#endif
1da177e4 LT	79	int get_optmin;
	80	int get_optmax;
	81	int (get)(struct sock sk, int optval, void __user user, int len);
c30f540b	82	#ifdef CONFIG_COMPAT
3fdadf7d DM	83	int (compat_get)(struct sock sk, int optval,
3fdadf7d DM	84	void __user user, int len);
c30f540b	85	#endif
16fcec35 NH	86	/* Use the module struct to lock set/get code in place */
16fcec35 NH	87	struct module *owner;
1da177e4 LT	88	};
1da177e4 LT	89
1da177e4 LT	90	/* Function to register/unregister hook points. */
	91	int nf_register_hook(struct nf_hook_ops *reg);
	92	void nf_unregister_hook(struct nf_hook_ops *reg);
972d1cb1 PM	93	int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
972d1cb1 PM	94	void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);
1da177e4 LT	95
	96	/* Functions to register get/setsockopt ranges (non-inclusive). You
	97	need to check permissions yourself! */
	98	int nf_register_sockopt(struct nf_sockopt_ops *reg);
	99	void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
	100
7e9c6eeb	101	extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
1da177e4	102
d1c85c2e	103	#ifdef HAVE_JUMP_LABEL
c5905afb	104	extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
d1c85c2e	105
a2d7ec58 ED	106	static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook)
	107	{
	108	if (__builtin_constant_p(pf) &&
	109	__builtin_constant_p(hook))
c5905afb	110	return static_key_false(&nf_hooks_needed[pf][hook]);
a2d7ec58 ED	111
	112	return !list_empty(&nf_hooks[pf][hook]);
	113	}
	114	#else
	115	static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook)
	116	{
	117	return !list_empty(&nf_hooks[pf][hook]);
	118	}
	119	#endif
	120
76108cea	121	int nf_hook_slow(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
16a6677f PM	122	struct net_device indev, struct net_device outdev,
	123	int (okfn)(struct sk_buff ), int thresh);
	124
	125	/**
	126	* nf_hook_thresh - call a netfilter hook
	127	*
	128	* Returns 1 if the hook has allowed the packet to pass. The function
	129	* okfn must be invoked by the caller in this case. Any other return
	130	* value indicates the packet has been consumed by the hook.
	131	*/
76108cea	132	static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
3db05fea	133	struct sk_buff *skb,
16a6677f PM	134	struct net_device *indev,
16a6677f PM	135	struct net_device *outdev,
23f3733d	136	int (okfn)(struct sk_buff ), int thresh)
16a6677f	137	{
a2d7ec58 ED	138	if (nf_hooks_active(pf, hook))
	139	return nf_hook_slow(pf, hook, skb, indev, outdev, okfn, thresh);
	140	return 1;
16a6677f PM	141	}
16a6677f PM	142
76108cea	143	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
16a6677f PM	144	struct net_device indev, struct net_device outdev,
	145	int (okfn)(struct sk_buff ))
	146	{
23f3733d	147	return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN);
16a6677f	148	}
1da177e4 LT	149
	150	/* Activate hook; either okfn or kfree_skb called, unless a hook
	151	returns NF_STOLEN (in which case, it's up to the hook to deal with
	152	the consequences).
	153
	154	Returns -ERRNO if packet dropped. Zero means queued, stolen or
	155	accepted.
	156	*/
	157
	158	/* RR:
	159	> I don't want nf_hook to return anything because people might forget
	160	> about async and trust the return value to mean "packet was ok".
	161
	162	AK:
	163	Just document it clearly, then you can expect some sense from kernel
	164	coders :)
	165	*/
	166
2249065f JE	167	static inline int
	168	NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	169	struct net_device in, struct net_device out,
	170	int (okfn)(struct sk_buff ), int thresh)
	171	{
	172	int ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, thresh);
	173	if (ret == 1)
	174	ret = okfn(skb);
	175	return ret;
	176	}
48d5cad8	177
2249065f JE	178	static inline int
	179	NF_HOOK_COND(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	180	struct net_device in, struct net_device out,
	181	int (okfn)(struct sk_buff ), bool cond)
	182	{
4bac6b18 PM	183	int ret;
	184
	185	if (!cond \|\|
ac5aa2e3	186	((ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, INT_MIN)) == 1))
2249065f JE	187	ret = okfn(skb);
	188	return ret;
	189	}
1da177e4	190
2249065f JE	191	static inline int
	192	NF_HOOK(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	193	struct net_device in, struct net_device out,
	194	int (okfn)(struct sk_buff ))
	195	{
	196	return NF_HOOK_THRESH(pf, hook, skb, in, out, okfn, INT_MIN);
	197	}
1da177e4 LT	198
1da177e4 LT	199	/* Call setsockopt() */
76108cea	200	int nf_setsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
b7058842	201	unsigned int len);
76108cea	202	int nf_getsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
1da177e4	203	int *len);
c30f540b	204	#ifdef CONFIG_COMPAT
76108cea	205	int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval,
b7058842	206	char __user *opt, unsigned int len);
76108cea	207	int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval,
3fdadf7d	208	char __user opt, int len);
c30f540b	209	#endif
3fdadf7d	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. */
a0f4ecf3	214	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);
d63a6507 PM	223	__sum16 (checksum_partial)(struct sk_buff skb,
	224	unsigned int hook,
	225	unsigned int dataoff,
	226	unsigned int len,
	227	u_int8_t protocol);
31ad3dd6	228	int (route)(struct net net, struct dst_entry **dst,
0fae2e77	229	struct flowi *fl, bool strict);
bce8032e	230	void (saveroute)(const struct sk_buff skb,
02f014d8	231	struct nf_queue_entry *entry);
3db05fea	232	int (reroute)(struct sk_buff skb,
02f014d8	233	const struct nf_queue_entry *entry);
bce8032e	234	int route_key_size;
2cc7d573 HW	235	};
2cc7d573 HW	236
0e60ebe0	237	extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO];
1e796fda	238	static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
bce8032e PM	239	{
	240	return rcu_dereference(nf_afinfo[family]);
	241	}
2cc7d573	242
b51655b9	243	static inline __sum16
422c346f PM	244	nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
	245	u_int8_t protocol, unsigned short family)
	246	{
1e796fda	247	const struct nf_afinfo *afinfo;
b51655b9	248	__sum16 csum = 0;
422c346f PM	249
	250	rcu_read_lock();
	251	afinfo = nf_get_afinfo(family);
	252	if (afinfo)
	253	csum = afinfo->checksum(skb, hook, dataoff, protocol);
	254	rcu_read_unlock();
	255	return csum;
	256	}
	257
d63a6507 PM	258	static inline __sum16
	259	nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
	260	unsigned int dataoff, unsigned int len,
	261	u_int8_t protocol, unsigned short family)
	262	{
	263	const struct nf_afinfo *afinfo;
	264	__sum16 csum = 0;
	265
	266	rcu_read_lock();
	267	afinfo = nf_get_afinfo(family);
	268	if (afinfo)
	269	csum = afinfo->checksum_partial(skb, hook, dataoff, len,
	270	protocol);
	271	rcu_read_unlock();
	272	return csum;
	273	}
	274
a0f4ecf3 JP	275	int nf_register_afinfo(const struct nf_afinfo *afinfo);
a0f4ecf3 JP	276	void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
bce8032e	277
eb9c7ebe	278	#include <net/flow.h>
c7232c99	279	extern void (nf_nat_decode_session_hook)(struct sk_buff , struct flowi *);
eb9c7ebe PM	280
eb9c7ebe PM	281	static inline void
76108cea	282	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
eb9c7ebe	283	{
051578cc	284	#ifdef CONFIG_NF_NAT_NEEDED
eb9c7ebe PM	285	void (decodefn)(struct sk_buff , struct flowi *);
eb9c7ebe PM	286
c7232c99 PM	287	rcu_read_lock();
	288	decodefn = rcu_dereference(nf_nat_decode_session_hook);
	289	if (decodefn)
	290	decodefn(skb, fl);
	291	rcu_read_unlock();
eb9c7ebe PM	292	#endif
	293	}
	294
1da177e4 LT	295	#else /* !CONFIG_NETFILTER */
1da177e4 LT	296	#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb)
48d5cad8	297	#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb)
76108cea	298	static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
3db05fea	299	struct sk_buff *skb,
f53b61d8 DM	300	struct net_device *indev,
f53b61d8 DM	301	struct net_device *outdev,
23f3733d	302	int (okfn)(struct sk_buff ), int thresh)
f53b61d8	303	{
3db05fea	304	return okfn(skb);
f53b61d8	305	}
76108cea	306	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
f53b61d8 DM	307	struct net_device indev, struct net_device outdev,
	308	int (okfn)(struct sk_buff ))
	309	{
9c92d348	310	return 1;
f53b61d8	311	}
f53b61d8	312	struct flowi;
eb9c7ebe	313	static inline void
76108cea JE	314	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
	315	{
	316	}
1da177e4 LT	317	#endif /CONFIG_NETFILTER/
1da177e4 LT	318
5f79e0f9	319	#if defined(CONFIG_NF_CONNTRACK) \|\| defined(CONFIG_NF_CONNTRACK_MODULE)
312a0c16	320	extern void (ip_ct_attach)(struct sk_buff , const struct sk_buff *) __rcu;
a0f4ecf3	321	void nf_ct_attach(struct sk_buff , const struct sk_buff );
0e60ebe0	322	extern void (nf_ct_destroy)(struct nf_conntrack ) __rcu;
9cb01766 PNA	323
9cb01766 PNA	324	struct nf_conn;
41d73ec0	325	enum ip_conntrack_info;
9cb01766 PNA	326	struct nlattr;
	327
	328	struct nfq_ct_hook {
	329	size_t (build_size)(const struct nf_conn ct);
	330	int (build)(struct sk_buff skb, struct nf_conn *ct);
	331	int (parse)(const struct nlattr attr, struct nf_conn *ct);
bd077937 PNA	332	int (attach_expect)(const struct nlattr attr, struct nf_conn *ct,
bd077937 PNA	333	u32 portid, u32 report);
8c88f87c	334	void (seq_adjust)(struct sk_buff skb, struct nf_conn *ct,
41d73ec0	335	enum ip_conntrack_info ctinfo, s32 off);
9cb01766	336	};
41d73ec0	337	extern struct nfq_ct_hook __rcu *nfq_ct_hook;
5f79e0f9 YK	338	#else
	339	static inline void nf_ct_attach(struct sk_buff new, struct sk_buff skb) {}
	340	#endif
	341
1da177e4	342	#endif /__LINUX_NETFILTER_H/