[mirror_ubuntu-artful-kernel.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);

#ifdef CONFIG_SYSCTL
/* Sysctl registration */
extern struct ctl_path nf_net_netfilter_sysctl_path[];
extern struct ctl_path nf_net_ipv4_netfilter_sysctl_path[];
#endif /* CONFIG_SYSCTL */

extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS];

int nf_hook_slow(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
		 struct net_device *indev, struct net_device *outdev,
		 int (*okfn)(struct sk_buff *), int thresh);

/**
 *	nf_hook_thresh - call a netfilter hook
 *	
 *	Returns 1 if the hook has allowed the packet to pass.  The function
 *	okfn must be invoked by the caller in this case.  Any other return
 *	value indicates the packet has been consumed by the hook.
 */
static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
				 struct sk_buff *skb,
				 struct net_device *indev,
				 struct net_device *outdev,
				 int (*okfn)(struct sk_buff *), int thresh)
{
#ifndef CONFIG_NETFILTER_DEBUG
	if (list_empty(&nf_hooks[pf][hook]))
		return 1;
#endif
	return nf_hook_slow(pf, hook, skb, indev, outdev, okfn, thresh);
}

static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
			  struct net_device *indev, struct net_device *outdev,
			  int (*okfn)(struct sk_buff *))
{
	return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN);
}
                   
/* 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
d62f9ed4 PM	157	#ifdef CONFIG_SYSCTL
d62f9ed4 PM	158	/* Sysctl registration */
b3fd3ffe PE	159	extern struct ctl_path nf_net_netfilter_sysctl_path[];
b3fd3ffe PE	160	extern struct ctl_path nf_net_ipv4_netfilter_sysctl_path[];
d62f9ed4 PM	161	#endif /* CONFIG_SYSCTL */
d62f9ed4 PM	162
7e9c6eeb	163	extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
1da177e4	164
76108cea	165	int nf_hook_slow(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
16a6677f PM	166	struct net_device indev, struct net_device outdev,
	167	int (okfn)(struct sk_buff ), int thresh);
	168
	169	/**
	170	* nf_hook_thresh - call a netfilter hook
	171	*
	172	* Returns 1 if the hook has allowed the packet to pass. The function
	173	* okfn must be invoked by the caller in this case. Any other return
	174	* value indicates the packet has been consumed by the hook.
	175	*/
76108cea	176	static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
3db05fea	177	struct sk_buff *skb,
16a6677f PM	178	struct net_device *indev,
16a6677f PM	179	struct net_device *outdev,
23f3733d	180	int (okfn)(struct sk_buff ), int thresh)
16a6677f PM	181	{
	182	#ifndef CONFIG_NETFILTER_DEBUG
	183	if (list_empty(&nf_hooks[pf][hook]))
	184	return 1;
	185	#endif
3db05fea	186	return nf_hook_slow(pf, hook, skb, indev, outdev, okfn, thresh);
16a6677f PM	187	}
16a6677f PM	188
76108cea	189	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
16a6677f PM	190	struct net_device indev, struct net_device outdev,
	191	int (okfn)(struct sk_buff ))
	192	{
23f3733d	193	return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN);
16a6677f	194	}
1da177e4 LT	195
	196	/* Activate hook; either okfn or kfree_skb called, unless a hook
	197	returns NF_STOLEN (in which case, it's up to the hook to deal with
	198	the consequences).
	199
	200	Returns -ERRNO if packet dropped. Zero means queued, stolen or
	201	accepted.
	202	*/
	203
	204	/* RR:
	205	> I don't want nf_hook to return anything because people might forget
	206	> about async and trust the return value to mean "packet was ok".
	207
	208	AK:
	209	Just document it clearly, then you can expect some sense from kernel
	210	coders :)
	211	*/
	212
2249065f JE	213	static inline int
	214	NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	215	struct net_device in, struct net_device out,
	216	int (okfn)(struct sk_buff ), int thresh)
	217	{
	218	int ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, thresh);
	219	if (ret == 1)
	220	ret = okfn(skb);
	221	return ret;
	222	}
48d5cad8	223
2249065f JE	224	static inline int
	225	NF_HOOK_COND(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	226	struct net_device in, struct net_device out,
	227	int (okfn)(struct sk_buff ), bool cond)
	228	{
4bac6b18 PM	229	int ret;
	230
	231	if (!cond \|\|
ac5aa2e3	232	((ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, INT_MIN)) == 1))
2249065f JE	233	ret = okfn(skb);
	234	return ret;
	235	}
1da177e4	236
2249065f JE	237	static inline int
	238	NF_HOOK(uint8_t pf, unsigned int hook, struct sk_buff *skb,
	239	struct net_device in, struct net_device out,
	240	int (okfn)(struct sk_buff ))
	241	{
	242	return NF_HOOK_THRESH(pf, hook, skb, in, out, okfn, INT_MIN);
	243	}
1da177e4 LT	244
1da177e4 LT	245	/* Call setsockopt() */
76108cea	246	int nf_setsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
b7058842	247	unsigned int len);
76108cea	248	int nf_getsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
1da177e4	249	int *len);
c30f540b	250	#ifdef CONFIG_COMPAT
76108cea	251	int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval,
b7058842	252	char __user *opt, unsigned int len);
76108cea	253	int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval,
3fdadf7d	254	char __user opt, int len);
c30f540b	255	#endif
3fdadf7d	256
089af26c HW	257	/* Call this before modifying an existing packet: ensures it is
	258	modifiable and linear to the point you care about (writable_len).
	259	Returns true or false. */
37d41879	260	extern int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);
089af26c	261
1841a4c7	262	struct flowi;
02f014d8	263	struct nf_queue_entry;
c01cd429	264
bce8032e PM	265	struct nf_afinfo {
bce8032e PM	266	unsigned short family;
b51655b9	267	__sum16 (checksum)(struct sk_buff skb, unsigned int hook,
422c346f	268	unsigned int dataoff, u_int8_t protocol);
d63a6507 PM	269	__sum16 (checksum_partial)(struct sk_buff skb,
	270	unsigned int hook,
	271	unsigned int dataoff,
	272	unsigned int len,
	273	u_int8_t protocol);
31ad3dd6	274	int (route)(struct net net, struct dst_entry **dst,
0fae2e77	275	struct flowi *fl, bool strict);
bce8032e	276	void (saveroute)(const struct sk_buff skb,
02f014d8	277	struct nf_queue_entry *entry);
3db05fea	278	int (reroute)(struct sk_buff skb,
02f014d8	279	const struct nf_queue_entry *entry);
bce8032e	280	int route_key_size;
2cc7d573 HW	281	};
2cc7d573 HW	282
0e60ebe0	283	extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO];
1e796fda	284	static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
bce8032e PM	285	{
	286	return rcu_dereference(nf_afinfo[family]);
	287	}
2cc7d573	288
b51655b9	289	static inline __sum16
422c346f PM	290	nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
	291	u_int8_t protocol, unsigned short family)
	292	{
1e796fda	293	const struct nf_afinfo *afinfo;
b51655b9	294	__sum16 csum = 0;
422c346f PM	295
	296	rcu_read_lock();
	297	afinfo = nf_get_afinfo(family);
	298	if (afinfo)
	299	csum = afinfo->checksum(skb, hook, dataoff, protocol);
	300	rcu_read_unlock();
	301	return csum;
	302	}
	303
d63a6507 PM	304	static inline __sum16
	305	nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
	306	unsigned int dataoff, unsigned int len,
	307	u_int8_t protocol, unsigned short family)
	308	{
	309	const struct nf_afinfo *afinfo;
	310	__sum16 csum = 0;
	311
	312	rcu_read_lock();
	313	afinfo = nf_get_afinfo(family);
	314	if (afinfo)
	315	csum = afinfo->checksum_partial(skb, hook, dataoff, len,
	316	protocol);
	317	rcu_read_unlock();
	318	return csum;
	319	}
	320
1e796fda PM	321	extern int nf_register_afinfo(const struct nf_afinfo *afinfo);
1e796fda PM	322	extern void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
bce8032e	323
eb9c7ebe PM	324	#include <net/flow.h>
	325	extern void (ip_nat_decode_session)(struct sk_buff , struct flowi *);
	326
	327	static inline void
76108cea	328	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
eb9c7ebe	329	{
051578cc	330	#ifdef CONFIG_NF_NAT_NEEDED
eb9c7ebe PM	331	void (decodefn)(struct sk_buff , struct flowi *);
eb9c7ebe PM	332
051578cc PM	333	if (family == AF_INET) {
	334	rcu_read_lock();
	335	decodefn = rcu_dereference(ip_nat_decode_session);
	336	if (decodefn)
	337	decodefn(skb, fl);
	338	rcu_read_unlock();
	339	}
eb9c7ebe PM	340	#endif
	341	}
	342
608c8e4f HW	343	#ifdef CONFIG_PROC_FS
	344	#include <linux/proc_fs.h>
	345	extern struct proc_dir_entry *proc_net_netfilter;
	346	#endif
	347
1da177e4 LT	348	#else /* !CONFIG_NETFILTER */
1da177e4 LT	349	#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb)
48d5cad8	350	#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb)
76108cea	351	static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
3db05fea	352	struct sk_buff *skb,
f53b61d8 DM	353	struct net_device *indev,
f53b61d8 DM	354	struct net_device *outdev,
23f3733d	355	int (okfn)(struct sk_buff ), int thresh)
f53b61d8	356	{
3db05fea	357	return okfn(skb);
f53b61d8	358	}
76108cea	359	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
f53b61d8 DM	360	struct net_device indev, struct net_device outdev,
	361	int (okfn)(struct sk_buff ))
	362	{
9c92d348	363	return 1;
f53b61d8	364	}
f53b61d8	365	struct flowi;
eb9c7ebe	366	static inline void
76108cea JE	367	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
	368	{
	369	}
1da177e4 LT	370	#endif /CONFIG_NETFILTER/
1da177e4 LT	371
5f79e0f9	372	#if defined(CONFIG_NF_CONNTRACK) \|\| defined(CONFIG_NF_CONNTRACK_MODULE)
0e60ebe0	373	extern void (ip_ct_attach)(struct sk_buff , struct sk_buff *) __rcu;
5f79e0f9	374	extern void nf_ct_attach(struct sk_buff , struct sk_buff );
0e60ebe0	375	extern void (nf_ct_destroy)(struct nf_conntrack ) __rcu;
5f79e0f9 YK	376	#else
	377	static inline void nf_ct_attach(struct sk_buff new, struct sk_buff skb) {}
	378	#endif
	379
1da177e4 LT	380	#endif /__KERNEL__/
1da177e4 LT	381	#endif /__LINUX_NETFILTER_H/