[linux-2.6-block.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 <linux/netfilter_defs.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);

struct sk_buff;

struct nf_hook_ops;

struct sock;

struct nf_hook_state {
	unsigned int hook;
	int thresh;
	u_int8_t pf;
	struct net_device *in;
	struct net_device *out;
	struct sock *sk;
	struct list_head *hook_list;
	int (*okfn)(struct sock *, struct sk_buff *);
};

static inline void nf_hook_state_init(struct nf_hook_state *p,
				      struct list_head *hook_list,
				      unsigned int hook,
				      int thresh, u_int8_t pf,
				      struct net_device *indev,
				      struct net_device *outdev,
				      struct sock *sk,
				      int (*okfn)(struct sock *, struct sk_buff *))
{
	p->hook = hook;
	p->thresh = thresh;
	p->pf = pf;
	p->in = indev;
	p->out = outdev;
	p->sk = sk;
	p->hook_list = hook_list;
	p->okfn = okfn;
}

typedef unsigned int nf_hookfn(const struct nf_hook_ops *ops,
			       struct sk_buff *skb,
			       const struct nf_hook_state *state);

struct nf_hook_ops {
	struct list_head 	list;

	/* User fills in from here down. */
	nf_hookfn		*hook;
	struct net_device	*dev;
	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_hook_list_active(struct list_head *nf_hook_list,
				       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_hook_list);
}
#else
static inline bool nf_hook_list_active(struct list_head *nf_hook_list,
				       u_int8_t pf, unsigned int hook)
{
	return !list_empty(nf_hook_list);
}
#endif

static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook)
{
	return nf_hook_list_active(&nf_hooks[pf][hook], pf, hook);
}

int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state);

/**
 *	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 sock *sk,
				 struct sk_buff *skb,
				 struct net_device *indev,
				 struct net_device *outdev,
				 int (*okfn)(struct sock *, struct sk_buff *),
				 int thresh)
{
	if (nf_hooks_active(pf, hook)) {
		struct nf_hook_state state;

		nf_hook_state_init(&state, &nf_hooks[pf][hook], hook, thresh,
				   pf, indev, outdev, sk, okfn);
		return nf_hook_slow(skb, &state);
	}
	return 1;
}

static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sock *sk,
			  struct sk_buff *skb, struct net_device *indev,
			  struct net_device *outdev,
			  int (*okfn)(struct sock *, struct sk_buff *))
{
	return nf_hook_thresh(pf, hook, sk, 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 sock *sk,
	       struct sk_buff *skb, struct net_device *in,
	       struct net_device *out,
	       int (*okfn)(struct sock *, struct sk_buff *), int thresh)
{
	int ret = nf_hook_thresh(pf, hook, sk, skb, in, out, okfn, thresh);
	if (ret == 1)
		ret = okfn(sk, skb);
	return ret;
}

static inline int
NF_HOOK_COND(uint8_t pf, unsigned int hook, struct sock *sk,
	     struct sk_buff *skb, struct net_device *in, struct net_device *out,
	     int (*okfn)(struct sock *, struct sk_buff *), bool cond)
{
	int ret;

	if (!cond ||
	    ((ret = nf_hook_thresh(pf, hook, sk, skb, in, out, okfn, INT_MIN)) == 1))
		ret = okfn(sk, skb);
	return ret;
}

static inline int
NF_HOOK(uint8_t pf, unsigned int hook, struct sock *sk, struct sk_buff *skb,
	struct net_device *in, struct net_device *out,
	int (*okfn)(struct sock *, struct sk_buff *))
{
	return NF_HOOK_THRESH(pf, hook, sk, 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, sk, skb, indev, outdev, okfn) (okfn)(sk, skb)
#define NF_HOOK_COND(pf, hook, sk, skb, indev, outdev, okfn, cond) (okfn)(sk, skb)
static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
				 struct sock *sk,
				 struct sk_buff *skb,
				 struct net_device *indev,
				 struct net_device *outdev,
				 int (*okfn)(struct sock *sk, struct sk_buff *), int thresh)
{
	return okfn(sk, skb);
}
static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sock *sk,
			  struct sk_buff *skb, struct net_device *indev,
			  struct net_device *outdev,
			  int (*okfn)(struct sock *, 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>
a263653e PNA	13	#include <linux/netfilter_defs.h>
a263653e PNA	14
1da177e4	15	#ifdef CONFIG_NETFILTER
f615df76 FW	16	static inline int NF_DROP_GETERR(int verdict)
	17	{
	18	return -(verdict >> NF_VERDICT_QBITS);
	19	}
1da177e4	20
b8beedd2 PM	21	static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1,
	22	const union nf_inet_addr *a2)
	23	{
	24	return a1->all[0] == a2->all[0] &&
	25	a1->all[1] == a2->all[1] &&
	26	a1->all[2] == a2->all[2] &&
	27	a1->all[3] == a2->all[3];
	28	}
	29
efdedd54 DF	30	static inline void nf_inet_addr_mask(const union nf_inet_addr *a1,
	31	union nf_inet_addr *result,
	32	const union nf_inet_addr *mask)
	33	{
	34	result->all[0] = a1->all[0] & mask->all[0];
	35	result->all[1] = a1->all[1] & mask->all[1];
	36	result->all[2] = a1->all[2] & mask->all[2];
	37	result->all[3] = a1->all[3] & mask->all[3];
	38	}
	39
a0f4ecf3	40	int netfilter_init(void);
1da177e4	41
1da177e4	42	struct sk_buff;
1da177e4	43
795aa6ef	44	struct nf_hook_ops;
cfdfab31	45
1c984f8a DM	46	struct sock;
1c984f8a DM	47
cfdfab31 DM	48	struct nf_hook_state {
	49	unsigned int hook;
	50	int thresh;
	51	u_int8_t pf;
	52	struct net_device *in;
	53	struct net_device *out;
1c984f8a	54	struct sock *sk;
f7191483	55	struct list_head *hook_list;
7026b1dd	56	int (okfn)(struct sock , struct sk_buff *);
cfdfab31 DM	57	};
cfdfab31 DM	58
107a9f4d	59	static inline void nf_hook_state_init(struct nf_hook_state *p,
f7191483	60	struct list_head *hook_list,
107a9f4d DM	61	unsigned int hook,
	62	int thresh, u_int8_t pf,
	63	struct net_device *indev,
	64	struct net_device *outdev,
1c984f8a	65	struct sock *sk,
7026b1dd	66	int (okfn)(struct sock , struct sk_buff *))
107a9f4d DM	67	{
	68	p->hook = hook;
	69	p->thresh = thresh;
	70	p->pf = pf;
	71	p->in = indev;
	72	p->out = outdev;
1c984f8a	73	p->sk = sk;
f7191483	74	p->hook_list = hook_list;
107a9f4d DM	75	p->okfn = okfn;
	76	}
	77
795aa6ef	78	typedef unsigned int nf_hookfn(const struct nf_hook_ops *ops,
3db05fea	79	struct sk_buff *skb,
238e54c9	80	const struct nf_hook_state *state);
1da177e4	81
d94d9fee	82	struct nf_hook_ops {
87d5c18c	83	struct list_head list;
1da177e4 LT	84
1da177e4 LT	85	/* User fills in from here down. */
87d5c18c	86	nf_hookfn *hook;
e687ad60	87	struct net_device *dev;
87d5c18c PN	88	struct module *owner;
	89	void *priv;
	90	u_int8_t pf;
	91	unsigned int hooknum;
1da177e4	92	/* Hooks are ordered in ascending priority. */
87d5c18c	93	int priority;
1da177e4 LT	94	};
1da177e4 LT	95
d94d9fee	96	struct nf_sockopt_ops {
1da177e4 LT	97	struct list_head list;
1da177e4 LT	98
76108cea	99	u_int8_t pf;
1da177e4 LT	100
	101	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
	102	int set_optmin;
	103	int set_optmax;
	104	int (set)(struct sock sk, int optval, void __user *user, unsigned int len);
c30f540b	105	#ifdef CONFIG_COMPAT
3fdadf7d DM	106	int (compat_set)(struct sock sk, int optval,
3fdadf7d DM	107	void __user *user, unsigned int len);
c30f540b	108	#endif
1da177e4 LT	109	int get_optmin;
	110	int get_optmax;
	111	int (get)(struct sock sk, int optval, void __user user, int len);
c30f540b	112	#ifdef CONFIG_COMPAT
3fdadf7d DM	113	int (compat_get)(struct sock sk, int optval,
3fdadf7d DM	114	void __user user, int len);
c30f540b	115	#endif
16fcec35 NH	116	/* Use the module struct to lock set/get code in place */
16fcec35 NH	117	struct module *owner;
1da177e4 LT	118	};
1da177e4 LT	119
1da177e4 LT	120	/* Function to register/unregister hook points. */
	121	int nf_register_hook(struct nf_hook_ops *reg);
	122	void nf_unregister_hook(struct nf_hook_ops *reg);
972d1cb1 PM	123	int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
972d1cb1 PM	124	void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);
1da177e4 LT	125
	126	/* Functions to register get/setsockopt ranges (non-inclusive). You
	127	need to check permissions yourself! */
	128	int nf_register_sockopt(struct nf_sockopt_ops *reg);
	129	void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
	130
7e9c6eeb	131	extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
1da177e4	132
d1c85c2e	133	#ifdef HAVE_JUMP_LABEL
c5905afb	134	extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
d1c85c2e	135
b8d0aad0 PN	136	static inline bool nf_hook_list_active(struct list_head *nf_hook_list,
b8d0aad0 PN	137	u_int8_t pf, unsigned int hook)
a2d7ec58 ED	138	{
	139	if (__builtin_constant_p(pf) &&
	140	__builtin_constant_p(hook))
c5905afb	141	return static_key_false(&nf_hooks_needed[pf][hook]);
a2d7ec58	142
b8d0aad0	143	return !list_empty(nf_hook_list);
a2d7ec58 ED	144	}
a2d7ec58 ED	145	#else
b8d0aad0 PN	146	static inline bool nf_hook_list_active(struct list_head *nf_hook_list,
b8d0aad0 PN	147	u_int8_t pf, unsigned int hook)
a2d7ec58	148	{
b8d0aad0	149	return !list_empty(nf_hook_list);
a2d7ec58 ED	150	}
	151	#endif
	152
b8d0aad0 PN	153	static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook)
	154	{
	155	return nf_hook_list_active(&nf_hooks[pf][hook], pf, hook);
	156	}
	157
cfdfab31	158	int nf_hook_slow(struct sk_buff skb, struct nf_hook_state state);
16a6677f PM	159
	160	/**
	161	* nf_hook_thresh - call a netfilter hook
b8d0aad0	162	*
16a6677f PM	163	* Returns 1 if the hook has allowed the packet to pass. The function
	164	* okfn must be invoked by the caller in this case. Any other return
	165	* value indicates the packet has been consumed by the hook.
	166	*/
76108cea	167	static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
7026b1dd	168	struct sock *sk,
3db05fea	169	struct sk_buff *skb,
16a6677f PM	170	struct net_device *indev,
16a6677f PM	171	struct net_device *outdev,
7026b1dd DM	172	int (okfn)(struct sock , struct sk_buff *),
7026b1dd DM	173	int thresh)
16a6677f	174	{
cfdfab31	175	if (nf_hooks_active(pf, hook)) {
107a9f4d	176	struct nf_hook_state state;
cfdfab31	177
f7191483 PN	178	nf_hook_state_init(&state, &nf_hooks[pf][hook], hook, thresh,
f7191483 PN	179	pf, indev, outdev, sk, okfn);
cfdfab31 DM	180	return nf_hook_slow(skb, &state);
cfdfab31 DM	181	}
a2d7ec58	182	return 1;
16a6677f PM	183	}
16a6677f PM	184
7026b1dd DM	185	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sock *sk,
	186	struct sk_buff skb, struct net_device indev,
	187	struct net_device *outdev,
	188	int (okfn)(struct sock , struct sk_buff *))
16a6677f	189	{
7026b1dd	190	return nf_hook_thresh(pf, hook, sk, skb, indev, outdev, okfn, INT_MIN);
16a6677f	191	}
1da177e4 LT	192
	193	/* Activate hook; either okfn or kfree_skb called, unless a hook
	194	returns NF_STOLEN (in which case, it's up to the hook to deal with
	195	the consequences).
	196
	197	Returns -ERRNO if packet dropped. Zero means queued, stolen or
	198	accepted.
	199	*/
	200
	201	/* RR:
	202	> I don't want nf_hook to return anything because people might forget
	203	> about async and trust the return value to mean "packet was ok".
	204
	205	AK:
	206	Just document it clearly, then you can expect some sense from kernel
	207	coders :)
	208	*/
	209
2249065f	210	static inline int
7026b1dd DM	211	NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct sock *sk,
	212	struct sk_buff skb, struct net_device in,
	213	struct net_device *out,
	214	int (okfn)(struct sock , struct sk_buff *), int thresh)
2249065f	215	{
7026b1dd	216	int ret = nf_hook_thresh(pf, hook, sk, skb, in, out, okfn, thresh);
2249065f	217	if (ret == 1)
7026b1dd	218	ret = okfn(sk, skb);
2249065f JE	219	return ret;
2249065f JE	220	}
48d5cad8	221
2249065f	222	static inline int
7026b1dd DM	223	NF_HOOK_COND(uint8_t pf, unsigned int hook, struct sock *sk,
	224	struct sk_buff skb, struct net_device in, struct net_device *out,
	225	int (okfn)(struct sock , struct sk_buff *), bool cond)
2249065f	226	{
4bac6b18 PM	227	int ret;
	228
	229	if (!cond \|\|
7026b1dd DM	230	((ret = nf_hook_thresh(pf, hook, sk, skb, in, out, okfn, INT_MIN)) == 1))
7026b1dd DM	231	ret = okfn(sk, skb);
2249065f JE	232	return ret;
2249065f JE	233	}
1da177e4	234
2249065f	235	static inline int
7026b1dd	236	NF_HOOK(uint8_t pf, unsigned int hook, struct sock sk, struct sk_buff skb,
2249065f	237	struct net_device in, struct net_device out,
7026b1dd	238	int (okfn)(struct sock , struct sk_buff *))
2249065f	239	{
7026b1dd	240	return NF_HOOK_THRESH(pf, hook, sk, skb, in, out, okfn, INT_MIN);
2249065f	241	}
1da177e4 LT	242
1da177e4 LT	243	/* Call setsockopt() */
76108cea	244	int nf_setsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
b7058842	245	unsigned int len);
76108cea	246	int nf_getsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
1da177e4	247	int *len);
c30f540b	248	#ifdef CONFIG_COMPAT
76108cea	249	int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval,
b7058842	250	char __user *opt, unsigned int len);
76108cea	251	int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval,
3fdadf7d	252	char __user opt, int len);
c30f540b	253	#endif
3fdadf7d	254
089af26c HW	255	/* Call this before modifying an existing packet: ensures it is
	256	modifiable and linear to the point you care about (writable_len).
	257	Returns true or false. */
a0f4ecf3	258	int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);
089af26c	259
1841a4c7	260	struct flowi;
02f014d8	261	struct nf_queue_entry;
c01cd429	262
bce8032e PM	263	struct nf_afinfo {
bce8032e PM	264	unsigned short family;
b51655b9	265	__sum16 (checksum)(struct sk_buff skb, unsigned int hook,
422c346f	266	unsigned int dataoff, u_int8_t protocol);
d63a6507 PM	267	__sum16 (checksum_partial)(struct sk_buff skb,
	268	unsigned int hook,
	269	unsigned int dataoff,
	270	unsigned int len,
	271	u_int8_t protocol);
31ad3dd6	272	int (route)(struct net net, struct dst_entry **dst,
0fae2e77	273	struct flowi *fl, bool strict);
bce8032e	274	void (saveroute)(const struct sk_buff skb,
02f014d8	275	struct nf_queue_entry *entry);
3db05fea	276	int (reroute)(struct sk_buff skb,
02f014d8	277	const struct nf_queue_entry *entry);
bce8032e	278	int route_key_size;
2cc7d573 HW	279	};
2cc7d573 HW	280
0e60ebe0	281	extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO];
1e796fda	282	static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
bce8032e PM	283	{
	284	return rcu_dereference(nf_afinfo[family]);
	285	}
2cc7d573	286
b51655b9	287	static inline __sum16
422c346f PM	288	nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
	289	u_int8_t protocol, unsigned short family)
	290	{
1e796fda	291	const struct nf_afinfo *afinfo;
b51655b9	292	__sum16 csum = 0;
422c346f PM	293
	294	rcu_read_lock();
	295	afinfo = nf_get_afinfo(family);
	296	if (afinfo)
	297	csum = afinfo->checksum(skb, hook, dataoff, protocol);
	298	rcu_read_unlock();
	299	return csum;
	300	}
	301
d63a6507 PM	302	static inline __sum16
	303	nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
	304	unsigned int dataoff, unsigned int len,
	305	u_int8_t protocol, unsigned short family)
	306	{
	307	const struct nf_afinfo *afinfo;
	308	__sum16 csum = 0;
	309
	310	rcu_read_lock();
	311	afinfo = nf_get_afinfo(family);
	312	if (afinfo)
	313	csum = afinfo->checksum_partial(skb, hook, dataoff, len,
	314	protocol);
	315	rcu_read_unlock();
	316	return csum;
	317	}
	318
a0f4ecf3 JP	319	int nf_register_afinfo(const struct nf_afinfo *afinfo);
a0f4ecf3 JP	320	void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
bce8032e	321
eb9c7ebe	322	#include <net/flow.h>
c7232c99	323	extern void (nf_nat_decode_session_hook)(struct sk_buff , struct flowi *);
eb9c7ebe PM	324
eb9c7ebe PM	325	static inline void
76108cea	326	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
eb9c7ebe	327	{
051578cc	328	#ifdef CONFIG_NF_NAT_NEEDED
eb9c7ebe PM	329	void (decodefn)(struct sk_buff , struct flowi *);
eb9c7ebe PM	330
c7232c99 PM	331	rcu_read_lock();
	332	decodefn = rcu_dereference(nf_nat_decode_session_hook);
	333	if (decodefn)
	334	decodefn(skb, fl);
	335	rcu_read_unlock();
eb9c7ebe PM	336	#endif
	337	}
	338
1da177e4	339	#else /* !CONFIG_NETFILTER */
7026b1dd DM	340	#define NF_HOOK(pf, hook, sk, skb, indev, outdev, okfn) (okfn)(sk, skb)
7026b1dd DM	341	#define NF_HOOK_COND(pf, hook, sk, skb, indev, outdev, okfn, cond) (okfn)(sk, skb)
76108cea	342	static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
7026b1dd	343	struct sock *sk,
3db05fea	344	struct sk_buff *skb,
f53b61d8 DM	345	struct net_device *indev,
f53b61d8 DM	346	struct net_device *outdev,
7026b1dd	347	int (okfn)(struct sock sk, struct sk_buff *), int thresh)
f53b61d8	348	{
7026b1dd	349	return okfn(sk, skb);
f53b61d8	350	}
7026b1dd DM	351	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sock *sk,
	352	struct sk_buff skb, struct net_device indev,
	353	struct net_device *outdev,
	354	int (okfn)(struct sock , struct sk_buff *))
f53b61d8	355	{
9c92d348	356	return 1;
f53b61d8	357	}
f53b61d8	358	struct flowi;
eb9c7ebe	359	static inline void
76108cea JE	360	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
	361	{
	362	}
1da177e4 LT	363	#endif /CONFIG_NETFILTER/
1da177e4 LT	364
5f79e0f9	365	#if defined(CONFIG_NF_CONNTRACK) \|\| defined(CONFIG_NF_CONNTRACK_MODULE)
312a0c16	366	extern void (ip_ct_attach)(struct sk_buff , const struct sk_buff *) __rcu;
a0f4ecf3	367	void nf_ct_attach(struct sk_buff , const struct sk_buff );
0e60ebe0	368	extern void (nf_ct_destroy)(struct nf_conntrack ) __rcu;
9cb01766 PNA	369
9cb01766 PNA	370	struct nf_conn;
41d73ec0	371	enum ip_conntrack_info;
9cb01766 PNA	372	struct nlattr;
	373
	374	struct nfq_ct_hook {
	375	size_t (build_size)(const struct nf_conn ct);
	376	int (build)(struct sk_buff skb, struct nf_conn *ct);
	377	int (parse)(const struct nlattr attr, struct nf_conn *ct);
bd077937 PNA	378	int (attach_expect)(const struct nlattr attr, struct nf_conn *ct,
bd077937 PNA	379	u32 portid, u32 report);
8c88f87c	380	void (seq_adjust)(struct sk_buff skb, struct nf_conn *ct,
41d73ec0	381	enum ip_conntrack_info ctinfo, s32 off);
9cb01766	382	};
41d73ec0	383	extern struct nfq_ct_hook __rcu *nfq_ct_hook;
5f79e0f9 YK	384	#else
	385	static inline void nf_ct_attach(struct sk_buff new, struct sk_buff skb) {}
	386	#endif
	387
1da177e4	388	#endif /__LINUX_NETFILTER_H/