[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 <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];

#if defined(CONFIG_JUMP_LABEL)
#include <linux/static_key.h>
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>
607ca46e	12	#include <uapi/linux/netfilter.h>
1da177e4	13	#ifdef CONFIG_NETFILTER
f615df76 FW	14	static inline int NF_DROP_GETERR(int verdict)
	15	{
	16	return -(verdict >> NF_VERDICT_QBITS);
	17	}
1da177e4	18
b8beedd2 PM	19	static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1,
	20	const union nf_inet_addr *a2)
	21	{
	22	return a1->all[0] == a2->all[0] &&
	23	a1->all[1] == a2->all[1] &&
	24	a1->all[2] == a2->all[2] &&
	25	a1->all[3] == a2->all[3];
	26	}
	27
efdedd54 DF	28	static inline void nf_inet_addr_mask(const union nf_inet_addr *a1,
	29	union nf_inet_addr *result,
	30	const union nf_inet_addr *mask)
	31	{
	32	result->all[0] = a1->all[0] & mask->all[0];
	33	result->all[1] = a1->all[1] & mask->all[1];
	34	result->all[2] = a1->all[2] & mask->all[2];
	35	result->all[3] = a1->all[3] & mask->all[3];
	36	}
	37
a0f4ecf3	38	int netfilter_init(void);
1da177e4 LT	39
	40	/* Largest hook number + 1 */
	41	#define NF_MAX_HOOKS 8
	42
	43	struct sk_buff;
1da177e4	44
795aa6ef PM	45	struct nf_hook_ops;
795aa6ef PM	46	typedef unsigned int nf_hookfn(const struct nf_hook_ops *ops,
3db05fea	47	struct sk_buff *skb,
1da177e4 LT	48	const struct net_device *in,
	49	const struct net_device *out,
	50	int (okfn)(struct sk_buff ));
	51
d94d9fee	52	struct nf_hook_ops {
1da177e4 LT	53	struct list_head list;
	54
	55	/* User fills in from here down. */
96518518 PM	56	nf_hookfn *hook;
	57	struct module *owner;
	58	void *priv;
	59	u_int8_t pf;
	60	unsigned int hooknum;
1da177e4	61	/* Hooks are ordered in ascending priority. */
96518518	62	int priority;
1da177e4 LT	63	};
1da177e4 LT	64
d94d9fee	65	struct nf_sockopt_ops {
1da177e4 LT	66	struct list_head list;
1da177e4 LT	67
76108cea	68	u_int8_t pf;
1da177e4 LT	69
	70	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
	71	int set_optmin;
	72	int set_optmax;
	73	int (set)(struct sock sk, int optval, void __user *user, unsigned int len);
c30f540b	74	#ifdef CONFIG_COMPAT
3fdadf7d DM	75	int (compat_set)(struct sock sk, int optval,
3fdadf7d DM	76	void __user *user, unsigned int len);
c30f540b	77	#endif
1da177e4 LT	78	int get_optmin;
	79	int get_optmax;
	80	int (get)(struct sock sk, int optval, void __user user, int len);
c30f540b	81	#ifdef CONFIG_COMPAT
3fdadf7d DM	82	int (compat_get)(struct sock sk, int optval,
3fdadf7d DM	83	void __user user, int len);
c30f540b	84	#endif
16fcec35 NH	85	/* Use the module struct to lock set/get code in place */
16fcec35 NH	86	struct module *owner;
1da177e4 LT	87	};
1da177e4 LT	88
1da177e4 LT	89	/* Function to register/unregister hook points. */
	90	int nf_register_hook(struct nf_hook_ops *reg);
	91	void nf_unregister_hook(struct nf_hook_ops *reg);
972d1cb1 PM	92	int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
972d1cb1 PM	93	void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);
1da177e4 LT	94
	95	/* Functions to register get/setsockopt ranges (non-inclusive). You
	96	need to check permissions yourself! */
	97	int nf_register_sockopt(struct nf_sockopt_ops *reg);
	98	void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
	99
7e9c6eeb	100	extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
1da177e4	101
a2d7ec58	102	#if defined(CONFIG_JUMP_LABEL)
c5905afb IM	103	#include <linux/static_key.h>
c5905afb IM	104	extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
a2d7ec58 ED	105	static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook)
	106	{
	107	if (__builtin_constant_p(pf) &&
	108	__builtin_constant_p(hook))
c5905afb	109	return static_key_false(&nf_hooks_needed[pf][hook]);
a2d7ec58 ED	110
	111	return !list_empty(&nf_hooks[pf][hook]);
	112	}
	113	#else
	114	static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook)
	115	{
	116	return !list_empty(&nf_hooks[pf][hook]);
	117	}
	118	#endif
	119
76108cea	120	int nf_hook_slow(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
16a6677f PM	121	struct net_device indev, struct net_device outdev,
	122	int (okfn)(struct sk_buff ), int thresh);
	123
	124	/**
	125	* nf_hook_thresh - call a netfilter hook
	126	*
	127	* Returns 1 if the hook has allowed the packet to pass. The function
	128	* okfn must be invoked by the caller in this case. Any other return
	129	* value indicates the packet has been consumed by the hook.
	130	*/
76108cea	131	static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
3db05fea	132	struct sk_buff *skb,
16a6677f PM	133	struct net_device *indev,
16a6677f PM	134	struct net_device *outdev,
23f3733d	135	int (okfn)(struct sk_buff ), int thresh)
16a6677f	136	{
a2d7ec58 ED	137	if (nf_hooks_active(pf, hook))
	138	return nf_hook_slow(pf, hook, skb, indev, outdev, okfn, thresh);
	139	return 1;
16a6677f PM	140	}
16a6677f PM	141
76108cea	142	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
16a6677f PM	143	struct net_device indev, struct net_device outdev,
	144	int (okfn)(struct sk_buff ))
	145	{
23f3733d	146	return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN);
16a6677f	147	}
1da177e4 LT	148
	149	/* Activate hook; either okfn or kfree_skb called, unless a hook
	150	returns NF_STOLEN (in which case, it's up to the hook to deal with
	151	the consequences).
	152
	153	Returns -ERRNO if packet dropped. Zero means queued, stolen or
	154	accepted.
	155	*/
	156
	157	/* RR:
	158	> I don't want nf_hook to return anything because people might forget
	159	> about async and trust the return value to mean "packet was ok".
	160
	161	AK:
	162	Just document it clearly, then you can expect some sense from kernel
	163	coders :)
	164	*/
	165
2249065f JE	166	static inline int
	167	NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	168	struct net_device in, struct net_device out,
	169	int (okfn)(struct sk_buff ), int thresh)
	170	{
	171	int ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, thresh);
	172	if (ret == 1)
	173	ret = okfn(skb);
	174	return ret;
	175	}
48d5cad8	176
2249065f JE	177	static inline int
	178	NF_HOOK_COND(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	179	struct net_device in, struct net_device out,
	180	int (okfn)(struct sk_buff ), bool cond)
	181	{
4bac6b18 PM	182	int ret;
	183
	184	if (!cond \|\|
ac5aa2e3	185	((ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, INT_MIN)) == 1))
2249065f JE	186	ret = okfn(skb);
	187	return ret;
	188	}
1da177e4	189
2249065f JE	190	static inline int
	191	NF_HOOK(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	192	struct net_device in, struct net_device out,
	193	int (okfn)(struct sk_buff ))
	194	{
	195	return NF_HOOK_THRESH(pf, hook, skb, in, out, okfn, INT_MIN);
	196	}
1da177e4 LT	197
1da177e4 LT	198	/* Call setsockopt() */
76108cea	199	int nf_setsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
b7058842	200	unsigned int len);
76108cea	201	int nf_getsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
1da177e4	202	int *len);
c30f540b	203	#ifdef CONFIG_COMPAT
76108cea	204	int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval,
b7058842	205	char __user *opt, unsigned int len);
76108cea	206	int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval,
3fdadf7d	207	char __user opt, int len);
c30f540b	208	#endif
3fdadf7d	209
089af26c HW	210	/* Call this before modifying an existing packet: ensures it is
	211	modifiable and linear to the point you care about (writable_len).
	212	Returns true or false. */
a0f4ecf3	213	int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);
089af26c	214
1841a4c7	215	struct flowi;
02f014d8	216	struct nf_queue_entry;
c01cd429	217
bce8032e PM	218	struct nf_afinfo {
bce8032e PM	219	unsigned short family;
b51655b9	220	__sum16 (checksum)(struct sk_buff skb, unsigned int hook,
422c346f	221	unsigned int dataoff, u_int8_t protocol);
d63a6507 PM	222	__sum16 (checksum_partial)(struct sk_buff skb,
	223	unsigned int hook,
	224	unsigned int dataoff,
	225	unsigned int len,
	226	u_int8_t protocol);
31ad3dd6	227	int (route)(struct net net, struct dst_entry **dst,
0fae2e77	228	struct flowi *fl, bool strict);
bce8032e	229	void (saveroute)(const struct sk_buff skb,
02f014d8	230	struct nf_queue_entry *entry);
3db05fea	231	int (reroute)(struct sk_buff skb,
02f014d8	232	const struct nf_queue_entry *entry);
bce8032e	233	int route_key_size;
2cc7d573 HW	234	};
2cc7d573 HW	235
0e60ebe0	236	extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO];
1e796fda	237	static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
bce8032e PM	238	{
	239	return rcu_dereference(nf_afinfo[family]);
	240	}
2cc7d573	241
b51655b9	242	static inline __sum16
422c346f PM	243	nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
	244	u_int8_t protocol, unsigned short family)
	245	{
1e796fda	246	const struct nf_afinfo *afinfo;
b51655b9	247	__sum16 csum = 0;
422c346f PM	248
	249	rcu_read_lock();
	250	afinfo = nf_get_afinfo(family);
	251	if (afinfo)
	252	csum = afinfo->checksum(skb, hook, dataoff, protocol);
	253	rcu_read_unlock();
	254	return csum;
	255	}
	256
d63a6507 PM	257	static inline __sum16
	258	nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
	259	unsigned int dataoff, unsigned int len,
	260	u_int8_t protocol, unsigned short family)
	261	{
	262	const struct nf_afinfo *afinfo;
	263	__sum16 csum = 0;
	264
	265	rcu_read_lock();
	266	afinfo = nf_get_afinfo(family);
	267	if (afinfo)
	268	csum = afinfo->checksum_partial(skb, hook, dataoff, len,
	269	protocol);
	270	rcu_read_unlock();
	271	return csum;
	272	}
	273
a0f4ecf3 JP	274	int nf_register_afinfo(const struct nf_afinfo *afinfo);
a0f4ecf3 JP	275	void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
bce8032e	276
eb9c7ebe	277	#include <net/flow.h>
c7232c99	278	extern void (nf_nat_decode_session_hook)(struct sk_buff , struct flowi *);
eb9c7ebe PM	279
eb9c7ebe PM	280	static inline void
76108cea	281	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
eb9c7ebe	282	{
051578cc	283	#ifdef CONFIG_NF_NAT_NEEDED
eb9c7ebe PM	284	void (decodefn)(struct sk_buff , struct flowi *);
eb9c7ebe PM	285
c7232c99 PM	286	rcu_read_lock();
	287	decodefn = rcu_dereference(nf_nat_decode_session_hook);
	288	if (decodefn)
	289	decodefn(skb, fl);
	290	rcu_read_unlock();
eb9c7ebe PM	291	#endif
	292	}
	293
1da177e4 LT	294	#else /* !CONFIG_NETFILTER */
1da177e4 LT	295	#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb)
48d5cad8	296	#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb)
76108cea	297	static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
3db05fea	298	struct sk_buff *skb,
f53b61d8 DM	299	struct net_device *indev,
f53b61d8 DM	300	struct net_device *outdev,
23f3733d	301	int (okfn)(struct sk_buff ), int thresh)
f53b61d8	302	{
3db05fea	303	return okfn(skb);
f53b61d8	304	}
76108cea	305	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
f53b61d8 DM	306	struct net_device indev, struct net_device outdev,
	307	int (okfn)(struct sk_buff ))
	308	{
9c92d348	309	return 1;
f53b61d8	310	}
f53b61d8	311	struct flowi;
eb9c7ebe	312	static inline void
76108cea JE	313	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
	314	{
	315	}
1da177e4 LT	316	#endif /CONFIG_NETFILTER/
1da177e4 LT	317
5f79e0f9	318	#if defined(CONFIG_NF_CONNTRACK) \|\| defined(CONFIG_NF_CONNTRACK_MODULE)
312a0c16	319	extern void (ip_ct_attach)(struct sk_buff , const struct sk_buff *) __rcu;
a0f4ecf3	320	void nf_ct_attach(struct sk_buff , const struct sk_buff );
0e60ebe0	321	extern void (nf_ct_destroy)(struct nf_conntrack ) __rcu;
9cb01766 PNA	322
9cb01766 PNA	323	struct nf_conn;
41d73ec0	324	enum ip_conntrack_info;
9cb01766 PNA	325	struct nlattr;
	326
	327	struct nfq_ct_hook {
	328	size_t (build_size)(const struct nf_conn ct);
	329	int (build)(struct sk_buff skb, struct nf_conn *ct);
	330	int (parse)(const struct nlattr attr, struct nf_conn *ct);
bd077937 PNA	331	int (attach_expect)(const struct nlattr attr, struct nf_conn *ct,
bd077937 PNA	332	u32 portid, u32 report);
8c88f87c	333	void (seq_adjust)(struct sk_buff skb, struct nf_conn *ct,
41d73ec0	334	enum ip_conntrack_info ctinfo, s32 off);
9cb01766	335	};
41d73ec0	336	extern struct nfq_ct_hook __rcu *nfq_ct_hook;
5f79e0f9 YK	337	#else
	338	static inline void nf_ct_attach(struct sk_buff new, struct sk_buff skb) {}
	339	#endif
	340
1da177e4	341	#endif /__LINUX_NETFILTER_H/