[GitHub/mt8127/android_kernel_alcatel_ttab.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>
#include <linux/sysctl.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 or errno values. Not nice, but better than additional function
 * arguments. */
#define NF_VERDICT_MASK 0x000000ff

/* extra verdict flags have mask 0x0000ff00 */
#define NF_VERDICT_FLAG_QUEUE_BYPASS	0x00008000

/* queue number (NF_QUEUE) or errno (NF_DROP) */
#define NF_VERDICT_QMASK 0xffff0000
#define NF_VERDICT_QBITS 16

#define NF_QUEUE_NR(x) ((((x) << 16) & NF_VERDICT_QMASK) | NF_QUEUE)

#define NF_DROP_ERR(x) (((-x) << 16) | NF_DROP)

/* only for userspace compatibility */
#ifndef __KERNEL__
/* Generic cache responses from hook functions.
   <= 0x2000 is used for protocol-flags. */
#define NFC_UNKNOWN 0x4000
#define NFC_ALTERED 0x8000

/* NF_VERDICT_BITS should be 8 now, but userspace might break if this changes */
#define NF_VERDICT_BITS 16
#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_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];
}

extern void netfilter_init(void);

/* Largest hook number + 1 */
#define NF_MAX_HOOKS 8

struct sk_buff;

typedef unsigned int nf_hookfn(unsigned int hooknum,
			       struct sk_buff *skb,
			       const struct net_device *in,
			       const struct net_device *out,
			       int (*okfn)(struct sk_buff *));

struct nf_hook_ops {
	struct list_head list;

	/* User fills in from here down. */
	nf_hookfn *hook;
	struct module *owner;
	u_int8_t pf;
	unsigned int hooknum;
	/* Hooks are ordered in ascending priority. */
	int priority;
};

struct nf_sockopt_ops {
	struct list_head list;

	u_int8_t pf;

	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
	int set_optmin;
	int set_optmax;
	int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len);
#ifdef CONFIG_COMPAT
	int (*compat_set)(struct sock *sk, int optval,
			void __user *user, unsigned int len);
#endif
	int get_optmin;
	int get_optmax;
	int (*get)(struct sock *sk, int optval, void __user *user, int *len);
#ifdef CONFIG_COMPAT
	int (*compat_get)(struct sock *sk, int optval,
			void __user *user, int *len);
#endif
	/* Use the module struct to lock set/get code in place */
	struct module *owner;
};

/* Function to register/unregister hook points. */
int nf_register_hook(struct nf_hook_ops *reg);
void nf_unregister_hook(struct nf_hook_ops *reg);
int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);

/* Functions to register get/setsockopt ranges (non-inclusive).  You
   need to check permissions yourself! */
int nf_register_sockopt(struct nf_sockopt_ops *reg);
void nf_unregister_sockopt(struct nf_sockopt_ops *reg);

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. */
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 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;
}

extern int nf_register_afinfo(const struct nf_afinfo *afinfo);
extern void nf_unregister_afinfo(const struct nf_afinfo *afinfo);

#include <net/flow.h>
extern void (*ip_nat_decode_session)(struct sk_buff *, struct flowi *);

static inline void
nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
{
#ifdef CONFIG_NF_NAT_NEEDED
	void (*decodefn)(struct sk_buff *, struct flowi *);

	if (family == AF_INET) {
		rcu_read_lock();
		decodefn = rcu_dereference(ip_nat_decode_session);
		if (decodefn)
			decodefn(skb, fl);
		rcu_read_unlock();
	}
#endif
}

#ifdef CONFIG_PROC_FS
#include <linux/proc_fs.h>
extern struct proc_dir_entry *proc_net_netfilter;
#endif

#else /* !CONFIG_NETFILTER */
#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb)
#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb)
static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
				 struct sk_buff *skb,
				 struct net_device *indev,
				 struct net_device *outdev,
				 int (*okfn)(struct sk_buff *), int thresh)
{
	return okfn(skb);
}
static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
			  struct net_device *indev, struct net_device *outdev,
			  int (*okfn)(struct sk_buff *))
{
	return 1;
}
struct flowi;
static inline void
nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
{
}
#endif /*CONFIG_NETFILTER*/

#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
extern void (*ip_ct_attach)(struct sk_buff *, struct sk_buff *) __rcu;
extern void nf_ct_attach(struct sk_buff *, struct sk_buff *);
extern void (*nf_ct_destroy)(struct nf_conntrack *) __rcu;
#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	15	#include <linux/compiler.h>
bee95250	16	#include <linux/sysctl.h>
1da177e4 LT	17
	18	/* Responses from hook functions. */
	19	#define NF_DROP 0
	20	#define NF_ACCEPT 1
	21	#define NF_STOLEN 2
	22	#define NF_QUEUE 3
	23	#define NF_REPEAT 4
	24	#define NF_STOP 5
	25	#define NF_MAX_VERDICT NF_STOP
	26
0ab43f84	27	/* we overload the higher bits for encoding auxiliary data such as the queue
f615df76 FW	28	* number or errno values. Not nice, but better than additional function
	29	* arguments. */
	30	#define NF_VERDICT_MASK 0x000000ff
	31
	32	/* extra verdict flags have mask 0x0000ff00 */
94b27cc3	33	#define NF_VERDICT_FLAG_QUEUE_BYPASS 0x00008000
0ab43f84	34
f615df76	35	/* queue number (NF_QUEUE) or errno (NF_DROP) */
0ab43f84 HW	36	#define NF_VERDICT_QMASK 0xffff0000
	37	#define NF_VERDICT_QBITS 16
	38
f615df76	39	#define NF_QUEUE_NR(x) ((((x) << 16) & NF_VERDICT_QMASK) \| NF_QUEUE)
0ab43f84	40
f615df76	41	#define NF_DROP_ERR(x) (((-x) << 16) \| NF_DROP)
da683650	42
6869c4d8 HW	43	/* only for userspace compatibility */
6869c4d8 HW	44	#ifndef __KERNEL__
1da177e4 LT	45	/* Generic cache responses from hook functions.
	46	<= 0x2000 is used for protocol-flags. */
	47	#define NFC_UNKNOWN 0x4000
	48	#define NFC_ALTERED 0x8000
f615df76 FW	49
	50	/* NF_VERDICT_BITS should be 8 now, but userspace might break if this changes */
	51	#define NF_VERDICT_BITS 16
6869c4d8	52	#endif
1da177e4	53
6e23ae2a PM	54	enum nf_inet_hooks {
	55	NF_INET_PRE_ROUTING,
	56	NF_INET_LOCAL_IN,
	57	NF_INET_FORWARD,
	58	NF_INET_LOCAL_OUT,
	59	NF_INET_POST_ROUTING,
	60	NF_INET_NUMHOOKS
	61	};
	62
7e9c6eeb JE	63	enum {
	64	NFPROTO_UNSPEC = 0,
	65	NFPROTO_IPV4 = 2,
	66	NFPROTO_ARP = 3,
	67	NFPROTO_BRIDGE = 7,
	68	NFPROTO_IPV6 = 10,
	69	NFPROTO_DECNET = 12,
	70	NFPROTO_NUMPROTO,
	71	};
	72
643a2c15	73	union nf_inet_addr {
7b33ed22	74	__u32 all[4];
643a2c15 JE	75	__be32 ip;
643a2c15 JE	76	__be32 ip6[4];
2e3075a2 JE	77	struct in_addr in;
2e3075a2 JE	78	struct in6_addr in6;
643a2c15 JE	79	};
643a2c15 JE	80
1da177e4	81	#ifdef __KERNEL__
1da177e4	82	#ifdef CONFIG_NETFILTER
f615df76 FW	83	static inline int NF_DROP_GETERR(int verdict)
	84	{
	85	return -(verdict >> NF_VERDICT_QBITS);
	86	}
1da177e4	87
b8beedd2 PM	88	static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1,
	89	const union nf_inet_addr *a2)
	90	{
	91	return a1->all[0] == a2->all[0] &&
	92	a1->all[1] == a2->all[1] &&
	93	a1->all[2] == a2->all[2] &&
	94	a1->all[3] == a2->all[3];
	95	}
	96
1da177e4 LT	97	extern void netfilter_init(void);
	98
	99	/* Largest hook number + 1 */
	100	#define NF_MAX_HOOKS 8
	101
	102	struct sk_buff;
1da177e4 LT	103
1da177e4 LT	104	typedef unsigned int nf_hookfn(unsigned int hooknum,
3db05fea	105	struct sk_buff *skb,
1da177e4 LT	106	const struct net_device *in,
	107	const struct net_device *out,
	108	int (okfn)(struct sk_buff ));
	109
d94d9fee	110	struct nf_hook_ops {
1da177e4 LT	111	struct list_head list;
	112
	113	/* User fills in from here down. */
	114	nf_hookfn *hook;
	115	struct module *owner;
76108cea JE	116	u_int8_t pf;
76108cea JE	117	unsigned int hooknum;
1da177e4 LT	118	/* Hooks are ordered in ascending priority. */
	119	int priority;
	120	};
	121
d94d9fee	122	struct nf_sockopt_ops {
1da177e4 LT	123	struct list_head list;
1da177e4 LT	124
76108cea	125	u_int8_t pf;
1da177e4 LT	126
	127	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
	128	int set_optmin;
	129	int set_optmax;
	130	int (set)(struct sock sk, int optval, void __user *user, unsigned int len);
c30f540b	131	#ifdef CONFIG_COMPAT
3fdadf7d DM	132	int (compat_set)(struct sock sk, int optval,
3fdadf7d DM	133	void __user *user, unsigned int len);
c30f540b	134	#endif
1da177e4 LT	135	int get_optmin;
	136	int get_optmax;
	137	int (get)(struct sock sk, int optval, void __user user, int len);
c30f540b	138	#ifdef CONFIG_COMPAT
3fdadf7d DM	139	int (compat_get)(struct sock sk, int optval,
3fdadf7d DM	140	void __user user, int len);
c30f540b	141	#endif
16fcec35 NH	142	/* Use the module struct to lock set/get code in place */
16fcec35 NH	143	struct module *owner;
1da177e4 LT	144	};
1da177e4 LT	145
1da177e4 LT	146	/* Function to register/unregister hook points. */
	147	int nf_register_hook(struct nf_hook_ops *reg);
	148	void nf_unregister_hook(struct nf_hook_ops *reg);
972d1cb1 PM	149	int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
972d1cb1 PM	150	void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);
1da177e4 LT	151
	152	/* Functions to register get/setsockopt ranges (non-inclusive). You
	153	need to check permissions yourself! */
	154	int nf_register_sockopt(struct nf_sockopt_ops *reg);
	155	void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
	156
7e9c6eeb	157	extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
1da177e4	158
a2d7ec58	159	#if defined(CONFIG_JUMP_LABEL)
c5905afb IM	160	#include <linux/static_key.h>
c5905afb IM	161	extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
a2d7ec58 ED	162	static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook)
	163	{
	164	if (__builtin_constant_p(pf) &&
	165	__builtin_constant_p(hook))
c5905afb	166	return static_key_false(&nf_hooks_needed[pf][hook]);
a2d7ec58 ED	167
	168	return !list_empty(&nf_hooks[pf][hook]);
	169	}
	170	#else
	171	static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook)
	172	{
	173	return !list_empty(&nf_hooks[pf][hook]);
	174	}
	175	#endif
	176
76108cea	177	int nf_hook_slow(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
16a6677f PM	178	struct net_device indev, struct net_device outdev,
	179	int (okfn)(struct sk_buff ), int thresh);
	180
	181	/**
	182	* nf_hook_thresh - call a netfilter hook
	183	*
	184	* Returns 1 if the hook has allowed the packet to pass. The function
	185	* okfn must be invoked by the caller in this case. Any other return
	186	* value indicates the packet has been consumed by the hook.
	187	*/
76108cea	188	static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
3db05fea	189	struct sk_buff *skb,
16a6677f PM	190	struct net_device *indev,
16a6677f PM	191	struct net_device *outdev,
23f3733d	192	int (okfn)(struct sk_buff ), int thresh)
16a6677f	193	{
a2d7ec58 ED	194	if (nf_hooks_active(pf, hook))
	195	return nf_hook_slow(pf, hook, skb, indev, outdev, okfn, thresh);
	196	return 1;
16a6677f PM	197	}
16a6677f PM	198
76108cea	199	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
16a6677f PM	200	struct net_device indev, struct net_device outdev,
	201	int (okfn)(struct sk_buff ))
	202	{
23f3733d	203	return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN);
16a6677f	204	}
1da177e4 LT	205
	206	/* Activate hook; either okfn or kfree_skb called, unless a hook
	207	returns NF_STOLEN (in which case, it's up to the hook to deal with
	208	the consequences).
	209
	210	Returns -ERRNO if packet dropped. Zero means queued, stolen or
	211	accepted.
	212	*/
	213
	214	/* RR:
	215	> I don't want nf_hook to return anything because people might forget
	216	> about async and trust the return value to mean "packet was ok".
	217
	218	AK:
	219	Just document it clearly, then you can expect some sense from kernel
	220	coders :)
	221	*/
	222
2249065f JE	223	static inline int
	224	NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	225	struct net_device in, struct net_device out,
	226	int (okfn)(struct sk_buff ), int thresh)
	227	{
	228	int ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, thresh);
	229	if (ret == 1)
	230	ret = okfn(skb);
	231	return ret;
	232	}
48d5cad8	233
2249065f JE	234	static inline int
	235	NF_HOOK_COND(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	236	struct net_device in, struct net_device out,
	237	int (okfn)(struct sk_buff ), bool cond)
	238	{
4bac6b18 PM	239	int ret;
	240
	241	if (!cond \|\|
ac5aa2e3	242	((ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, INT_MIN)) == 1))
2249065f JE	243	ret = okfn(skb);
	244	return ret;
	245	}
1da177e4	246
2249065f JE	247	static inline int
	248	NF_HOOK(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	249	struct net_device in, struct net_device out,
	250	int (okfn)(struct sk_buff ))
	251	{
	252	return NF_HOOK_THRESH(pf, hook, skb, in, out, okfn, INT_MIN);
	253	}
1da177e4 LT	254
1da177e4 LT	255	/* Call setsockopt() */
76108cea	256	int nf_setsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
b7058842	257	unsigned int len);
76108cea	258	int nf_getsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
1da177e4	259	int *len);
c30f540b	260	#ifdef CONFIG_COMPAT
76108cea	261	int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval,
b7058842	262	char __user *opt, unsigned int len);
76108cea	263	int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval,
3fdadf7d	264	char __user opt, int len);
c30f540b	265	#endif
3fdadf7d	266
089af26c HW	267	/* Call this before modifying an existing packet: ensures it is
	268	modifiable and linear to the point you care about (writable_len).
	269	Returns true or false. */
37d41879	270	extern int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);
089af26c	271
1841a4c7	272	struct flowi;
02f014d8	273	struct nf_queue_entry;
c01cd429	274
bce8032e PM	275	struct nf_afinfo {
bce8032e PM	276	unsigned short family;
b51655b9	277	__sum16 (checksum)(struct sk_buff skb, unsigned int hook,
422c346f	278	unsigned int dataoff, u_int8_t protocol);
d63a6507 PM	279	__sum16 (checksum_partial)(struct sk_buff skb,
	280	unsigned int hook,
	281	unsigned int dataoff,
	282	unsigned int len,
	283	u_int8_t protocol);
31ad3dd6	284	int (route)(struct net net, struct dst_entry **dst,
0fae2e77	285	struct flowi *fl, bool strict);
bce8032e	286	void (saveroute)(const struct sk_buff skb,
02f014d8	287	struct nf_queue_entry *entry);
3db05fea	288	int (reroute)(struct sk_buff skb,
02f014d8	289	const struct nf_queue_entry *entry);
bce8032e	290	int route_key_size;
2cc7d573 HW	291	};
2cc7d573 HW	292
0e60ebe0	293	extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO];
1e796fda	294	static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
bce8032e PM	295	{
	296	return rcu_dereference(nf_afinfo[family]);
	297	}
2cc7d573	298
b51655b9	299	static inline __sum16
422c346f PM	300	nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
	301	u_int8_t protocol, unsigned short family)
	302	{
1e796fda	303	const struct nf_afinfo *afinfo;
b51655b9	304	__sum16 csum = 0;
422c346f PM	305
	306	rcu_read_lock();
	307	afinfo = nf_get_afinfo(family);
	308	if (afinfo)
	309	csum = afinfo->checksum(skb, hook, dataoff, protocol);
	310	rcu_read_unlock();
	311	return csum;
	312	}
	313
d63a6507 PM	314	static inline __sum16
	315	nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
	316	unsigned int dataoff, unsigned int len,
	317	u_int8_t protocol, unsigned short family)
	318	{
	319	const struct nf_afinfo *afinfo;
	320	__sum16 csum = 0;
	321
	322	rcu_read_lock();
	323	afinfo = nf_get_afinfo(family);
	324	if (afinfo)
	325	csum = afinfo->checksum_partial(skb, hook, dataoff, len,
	326	protocol);
	327	rcu_read_unlock();
	328	return csum;
	329	}
	330
1e796fda PM	331	extern int nf_register_afinfo(const struct nf_afinfo *afinfo);
1e796fda PM	332	extern void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
bce8032e	333
eb9c7ebe PM	334	#include <net/flow.h>
	335	extern void (ip_nat_decode_session)(struct sk_buff , struct flowi *);
	336
	337	static inline void
76108cea	338	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
eb9c7ebe	339	{
051578cc	340	#ifdef CONFIG_NF_NAT_NEEDED
eb9c7ebe PM	341	void (decodefn)(struct sk_buff , struct flowi *);
eb9c7ebe PM	342
051578cc PM	343	if (family == AF_INET) {
	344	rcu_read_lock();
	345	decodefn = rcu_dereference(ip_nat_decode_session);
	346	if (decodefn)
	347	decodefn(skb, fl);
	348	rcu_read_unlock();
	349	}
eb9c7ebe PM	350	#endif
	351	}
	352
608c8e4f HW	353	#ifdef CONFIG_PROC_FS
	354	#include <linux/proc_fs.h>
	355	extern struct proc_dir_entry *proc_net_netfilter;
	356	#endif
	357
1da177e4 LT	358	#else /* !CONFIG_NETFILTER */
1da177e4 LT	359	#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb)
48d5cad8	360	#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb)
76108cea	361	static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
3db05fea	362	struct sk_buff *skb,
f53b61d8 DM	363	struct net_device *indev,
f53b61d8 DM	364	struct net_device *outdev,
23f3733d	365	int (okfn)(struct sk_buff ), int thresh)
f53b61d8	366	{
3db05fea	367	return okfn(skb);
f53b61d8	368	}
76108cea	369	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
f53b61d8 DM	370	struct net_device indev, struct net_device outdev,
	371	int (okfn)(struct sk_buff ))
	372	{
9c92d348	373	return 1;
f53b61d8	374	}
f53b61d8	375	struct flowi;
eb9c7ebe	376	static inline void
76108cea JE	377	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
	378	{
	379	}
1da177e4 LT	380	#endif /CONFIG_NETFILTER/
1da177e4 LT	381
5f79e0f9	382	#if defined(CONFIG_NF_CONNTRACK) \|\| defined(CONFIG_NF_CONNTRACK_MODULE)
0e60ebe0	383	extern void (ip_ct_attach)(struct sk_buff , struct sk_buff *) __rcu;
5f79e0f9	384	extern void nf_ct_attach(struct sk_buff , struct sk_buff );
0e60ebe0	385	extern void (nf_ct_destroy)(struct nf_conntrack ) __rcu;
5f79e0f9 YK	386	#else
	387	static inline void nf_ct_attach(struct sk_buff new, struct sk_buff skb) {}
	388	#endif
	389
1da177e4 LT	390	#endif /__KERNEL__/
1da177e4 LT	391	#endif /__LINUX_NETFILTER_H/