[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/netdevice.h>
#include <linux/if.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/wait.h>
#include <linux/list.h>
#include <net/net_namespace.h>
#endif
#include <linux/types.h>
#include <linux/compiler.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. Not nice, but better than additional function arguments. */
#define NF_VERDICT_MASK 0x0000ffff
#define NF_VERDICT_BITS 16

#define NF_VERDICT_QMASK 0xffff0000
#define NF_VERDICT_QBITS 16

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

/* 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
#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
};

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_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;
	int pf;
	int hooknum;
	/* Hooks are ordered in ascending priority. */
	int priority;
};

struct nf_sockopt_ops
{
	struct list_head list;

	int 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);
	int (*compat_set)(struct sock *sk, int optval,
			void __user *user, unsigned int len);

	int get_optmin;
	int get_optmax;
	int (*get)(struct sock *sk, int optval, void __user *user, int *len);
	int (*compat_get)(struct sock *sk, int optval,
			void __user *user, int *len);

	/* 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[NPROTO][NF_MAX_HOOKS];

int nf_hook_slow(int 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(int pf, unsigned int hook,
				 struct sk_buff *skb,
				 struct net_device *indev,
				 struct net_device *outdev,
				 int (*okfn)(struct sk_buff *), int thresh,
				 int cond)
{
	if (!cond)
		return 1;
#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(int 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, 1);
}
                   
/* 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 :)
*/

/* This is gross, but inline doesn't cut it for avoiding the function
   call in fast path: gcc doesn't inline (needs value tracking?). --RR */

/* HX: It's slightly less gross now. */

#define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh)	       \
({int __ret;								       \
if ((__ret=nf_hook_thresh(pf, hook, (skb), indev, outdev, okfn, thresh, 1)) == 1)\
	__ret = (okfn)(skb);						       \
__ret;})

#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond)		       \
({int __ret;								       \
if ((__ret=nf_hook_thresh(pf, hook, (skb), indev, outdev, okfn, INT_MIN, cond)) == 1)\
	__ret = (okfn)(skb);						       \
__ret;})

#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) \
	NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, INT_MIN)

/* Call setsockopt() */
int nf_setsockopt(struct sock *sk, int pf, int optval, char __user *opt, 
		  int len);
int nf_getsockopt(struct sock *sk, int pf, int optval, char __user *opt,
		  int *len);

int compat_nf_setsockopt(struct sock *sk, int pf, int optval,
		char __user *opt, int len);
int compat_nf_getsockopt(struct sock *sk, int pf, int optval,
		char __user *opt, int *len);

/* 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 dst_entry **dst, struct flowi *fl);
	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 *nf_afinfo[NPROTO];
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, int 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(int pf, unsigned int hook,
				 struct sk_buff *skb,
				 struct net_device *indev,
				 struct net_device *outdev,
				 int (*okfn)(struct sk_buff *), int thresh,
				 int cond)
{
	return okfn(skb);
}
static inline int nf_hook(int 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, int 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 *);
extern void nf_ct_attach(struct sk_buff *, struct sk_buff *);
extern void (*nf_ct_destroy)(struct nf_conntrack *);
#else
static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {}
#endif

static inline struct net *nf_pre_routing_net(const struct net_device *in,
					     const struct net_device *out)
{
#ifdef CONFIG_NET_NS
	return in->nd_net;
#else
	return &init_net;
#endif
}

static inline struct net *nf_local_in_net(const struct net_device *in,
					  const struct net_device *out)
{
#ifdef CONFIG_NET_NS
	return in->nd_net;
#else
	return &init_net;
#endif
}

static inline struct net *nf_forward_net(const struct net_device *in,
					 const struct net_device *out)
{
#ifdef CONFIG_NET_NS
	BUG_ON(in->nd_net != out->nd_net);
	return in->nd_net;
#else
	return &init_net;
#endif
}

static inline struct net *nf_local_out_net(const struct net_device *in,
					   const struct net_device *out)
{
#ifdef CONFIG_NET_NS
	return out->nd_net;
#else
	return &init_net;
#endif
}

static inline struct net *nf_post_routing_net(const struct net_device *in,
					      const struct net_device *out)
{
#ifdef CONFIG_NET_NS
	return out->nd_net;
#else
	return &init_net;
#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>
1da177e4 LT	7	#include <linux/net.h>
666953df	8	#include <linux/netdevice.h>
1da177e4	9	#include <linux/if.h>
2e3075a2 JE	10	#include <linux/in.h>
2e3075a2 JE	11	#include <linux/in6.h>
1da177e4 LT	12	#include <linux/wait.h>
1da177e4 LT	13	#include <linux/list.h>
666953df	14	#include <net/net_namespace.h>
1da177e4	15	#endif
c8942f1f	16	#include <linux/types.h>
1da177e4 LT	17	#include <linux/compiler.h>
	18
	19	/* Responses from hook functions. */
	20	#define NF_DROP 0
	21	#define NF_ACCEPT 1
	22	#define NF_STOLEN 2
	23	#define NF_QUEUE 3
	24	#define NF_REPEAT 4
	25	#define NF_STOP 5
	26	#define NF_MAX_VERDICT NF_STOP
	27
0ab43f84 HW	28	/* we overload the higher bits for encoding auxiliary data such as the queue
	29	* number. Not nice, but better than additional function arguments. */
	30	#define NF_VERDICT_MASK 0x0000ffff
	31	#define NF_VERDICT_BITS 16
	32
	33	#define NF_VERDICT_QMASK 0xffff0000
	34	#define NF_VERDICT_QBITS 16
	35
fbabbed8	36	#define NF_QUEUE_NR(x) ((((x) << NF_VERDICT_BITS) & NF_VERDICT_QMASK) \| NF_QUEUE)
0ab43f84	37
6869c4d8 HW	38	/* only for userspace compatibility */
6869c4d8 HW	39	#ifndef __KERNEL__
1da177e4 LT	40	/* Generic cache responses from hook functions.
	41	<= 0x2000 is used for protocol-flags. */
	42	#define NFC_UNKNOWN 0x4000
	43	#define NFC_ALTERED 0x8000
6869c4d8	44	#endif
1da177e4	45
6e23ae2a PM	46	enum nf_inet_hooks {
	47	NF_INET_PRE_ROUTING,
	48	NF_INET_LOCAL_IN,
	49	NF_INET_FORWARD,
	50	NF_INET_LOCAL_OUT,
	51	NF_INET_POST_ROUTING,
	52	NF_INET_NUMHOOKS
	53	};
	54
643a2c15	55	union nf_inet_addr {
7b33ed22	56	__u32 all[4];
643a2c15 JE	57	__be32 ip;
643a2c15 JE	58	__be32 ip6[4];
2e3075a2 JE	59	struct in_addr in;
2e3075a2 JE	60	struct in6_addr in6;
643a2c15 JE	61	};
643a2c15 JE	62
1da177e4	63	#ifdef __KERNEL__
1da177e4 LT	64	#ifdef CONFIG_NETFILTER
1da177e4 LT	65
b8beedd2 PM	66	static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1,
	67	const union nf_inet_addr *a2)
	68	{
	69	return a1->all[0] == a2->all[0] &&
	70	a1->all[1] == a2->all[1] &&
	71	a1->all[2] == a2->all[2] &&
	72	a1->all[3] == a2->all[3];
	73	}
	74
1da177e4 LT	75	extern void netfilter_init(void);
	76
	77	/* Largest hook number + 1 */
	78	#define NF_MAX_HOOKS 8
	79
	80	struct sk_buff;
1da177e4 LT	81
1da177e4 LT	82	typedef unsigned int nf_hookfn(unsigned int hooknum,
3db05fea	83	struct sk_buff *skb,
1da177e4 LT	84	const struct net_device *in,
	85	const struct net_device *out,
	86	int (okfn)(struct sk_buff ));
	87
	88	struct nf_hook_ops
	89	{
	90	struct list_head list;
	91
	92	/* User fills in from here down. */
	93	nf_hookfn *hook;
	94	struct module *owner;
	95	int pf;
	96	int hooknum;
	97	/* Hooks are ordered in ascending priority. */
	98	int priority;
	99	};
	100
	101	struct nf_sockopt_ops
	102	{
	103	struct list_head list;
	104
	105	int pf;
	106
	107	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
	108	int set_optmin;
	109	int set_optmax;
	110	int (set)(struct sock sk, int optval, void __user *user, unsigned int len);
3fdadf7d DM	111	int (compat_set)(struct sock sk, int optval,
3fdadf7d DM	112	void __user *user, unsigned int len);
1da177e4 LT	113
	114	int get_optmin;
	115	int get_optmax;
	116	int (get)(struct sock sk, int optval, void __user user, int len);
3fdadf7d DM	117	int (compat_get)(struct sock sk, int optval,
3fdadf7d DM	118	void __user user, int len);
1da177e4	119
16fcec35 NH	120	/* Use the module struct to lock set/get code in place */
16fcec35 NH	121	struct module *owner;
1da177e4 LT	122	};
1da177e4 LT	123
1da177e4 LT	124	/* Function to register/unregister hook points. */
	125	int nf_register_hook(struct nf_hook_ops *reg);
	126	void nf_unregister_hook(struct nf_hook_ops *reg);
972d1cb1 PM	127	int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
972d1cb1 PM	128	void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);
1da177e4 LT	129
	130	/* Functions to register get/setsockopt ranges (non-inclusive). You
	131	need to check permissions yourself! */
	132	int nf_register_sockopt(struct nf_sockopt_ops *reg);
	133	void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
	134
d62f9ed4 PM	135	#ifdef CONFIG_SYSCTL
d62f9ed4 PM	136	/* Sysctl registration */
b3fd3ffe PE	137	extern struct ctl_path nf_net_netfilter_sysctl_path[];
b3fd3ffe PE	138	extern struct ctl_path nf_net_ipv4_netfilter_sysctl_path[];
d62f9ed4 PM	139	#endif /* CONFIG_SYSCTL */
d62f9ed4 PM	140
1da177e4 LT	141	extern struct list_head nf_hooks[NPROTO][NF_MAX_HOOKS];
1da177e4 LT	142
3db05fea	143	int nf_hook_slow(int pf, unsigned int hook, struct sk_buff *skb,
16a6677f PM	144	struct net_device indev, struct net_device outdev,
	145	int (okfn)(struct sk_buff ), int thresh);
	146
	147	/**
	148	* nf_hook_thresh - call a netfilter hook
	149	*
	150	* Returns 1 if the hook has allowed the packet to pass. The function
	151	* okfn must be invoked by the caller in this case. Any other return
	152	* value indicates the packet has been consumed by the hook.
	153	*/
	154	static inline int nf_hook_thresh(int pf, unsigned int hook,
3db05fea	155	struct sk_buff *skb,
16a6677f PM	156	struct net_device *indev,
16a6677f PM	157	struct net_device *outdev,
48d5cad8 PM	158	int (okfn)(struct sk_buff ), int thresh,
48d5cad8 PM	159	int cond)
16a6677f	160	{
48d5cad8 PM	161	if (!cond)
48d5cad8 PM	162	return 1;
16a6677f PM	163	#ifndef CONFIG_NETFILTER_DEBUG
	164	if (list_empty(&nf_hooks[pf][hook]))
	165	return 1;
	166	#endif
3db05fea	167	return nf_hook_slow(pf, hook, skb, indev, outdev, okfn, thresh);
16a6677f PM	168	}
16a6677f PM	169
3db05fea	170	static inline int nf_hook(int pf, unsigned int hook, struct sk_buff *skb,
16a6677f PM	171	struct net_device indev, struct net_device outdev,
	172	int (okfn)(struct sk_buff ))
	173	{
3db05fea	174	return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN, 1);
16a6677f	175	}
1da177e4 LT	176
	177	/* Activate hook; either okfn or kfree_skb called, unless a hook
	178	returns NF_STOLEN (in which case, it's up to the hook to deal with
	179	the consequences).
	180
	181	Returns -ERRNO if packet dropped. Zero means queued, stolen or
	182	accepted.
	183	*/
	184
	185	/* RR:
	186	> I don't want nf_hook to return anything because people might forget
	187	> about async and trust the return value to mean "packet was ok".
	188
	189	AK:
	190	Just document it clearly, then you can expect some sense from kernel
	191	coders :)
	192	*/
	193
	194	/* This is gross, but inline doesn't cut it for avoiding the function
	195	call in fast path: gcc doesn't inline (needs value tracking?). --RR */
16a6677f PM	196
	197	/* HX: It's slightly less gross now. */
	198
1da177e4 LT	199	#define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh) \
1da177e4 LT	200	({int __ret; \
3db05fea	201	if ((__ret=nf_hook_thresh(pf, hook, (skb), indev, outdev, okfn, thresh, 1)) == 1)\
48d5cad8 PM	202	__ret = (okfn)(skb); \
	203	__ret;})
	204
	205	#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) \
	206	({int __ret; \
3db05fea	207	if ((__ret=nf_hook_thresh(pf, hook, (skb), indev, outdev, okfn, INT_MIN, cond)) == 1)\
1da177e4 LT	208	__ret = (okfn)(skb); \
1da177e4 LT	209	__ret;})
1da177e4	210
16a6677f PM	211	#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) \
16a6677f PM	212	NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, INT_MIN)
1da177e4 LT	213
	214	/* Call setsockopt() */
	215	int nf_setsockopt(struct sock sk, int pf, int optval, char __user opt,
	216	int len);
	217	int nf_getsockopt(struct sock sk, int pf, int optval, char __user opt,
	218	int *len);
	219
3fdadf7d DM	220	int compat_nf_setsockopt(struct sock *sk, int pf, int optval,
	221	char __user *opt, int len);
	222	int compat_nf_getsockopt(struct sock *sk, int pf, int optval,
	223	char __user opt, int len);
	224
089af26c HW	225	/* Call this before modifying an existing packet: ensures it is
	226	modifiable and linear to the point you care about (writable_len).
	227	Returns true or false. */
37d41879	228	extern int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);
089af26c	229
1841a4c7	230	struct flowi;
02f014d8	231	struct nf_queue_entry;
c01cd429	232
bce8032e PM	233	struct nf_afinfo {
bce8032e PM	234	unsigned short family;
b51655b9	235	__sum16 (checksum)(struct sk_buff skb, unsigned int hook,
422c346f	236	unsigned int dataoff, u_int8_t protocol);
d63a6507 PM	237	__sum16 (checksum_partial)(struct sk_buff skb,
	238	unsigned int hook,
	239	unsigned int dataoff,
	240	unsigned int len,
	241	u_int8_t protocol);
1841a4c7	242	int (route)(struct dst_entry dst, struct flowi fl);
bce8032e	243	void (saveroute)(const struct sk_buff skb,
02f014d8	244	struct nf_queue_entry *entry);
3db05fea	245	int (reroute)(struct sk_buff skb,
02f014d8	246	const struct nf_queue_entry *entry);
bce8032e	247	int route_key_size;
2cc7d573 HW	248	};
2cc7d573 HW	249
1e796fda PM	250	extern const struct nf_afinfo *nf_afinfo[NPROTO];
1e796fda PM	251	static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
bce8032e PM	252	{
	253	return rcu_dereference(nf_afinfo[family]);
	254	}
2cc7d573	255
b51655b9	256	static inline __sum16
422c346f PM	257	nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
	258	u_int8_t protocol, unsigned short family)
	259	{
1e796fda	260	const struct nf_afinfo *afinfo;
b51655b9	261	__sum16 csum = 0;
422c346f PM	262
	263	rcu_read_lock();
	264	afinfo = nf_get_afinfo(family);
	265	if (afinfo)
	266	csum = afinfo->checksum(skb, hook, dataoff, protocol);
	267	rcu_read_unlock();
	268	return csum;
	269	}
	270
d63a6507 PM	271	static inline __sum16
	272	nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
	273	unsigned int dataoff, unsigned int len,
	274	u_int8_t protocol, unsigned short family)
	275	{
	276	const struct nf_afinfo *afinfo;
	277	__sum16 csum = 0;
	278
	279	rcu_read_lock();
	280	afinfo = nf_get_afinfo(family);
	281	if (afinfo)
	282	csum = afinfo->checksum_partial(skb, hook, dataoff, len,
	283	protocol);
	284	rcu_read_unlock();
	285	return csum;
	286	}
	287
1e796fda PM	288	extern int nf_register_afinfo(const struct nf_afinfo *afinfo);
1e796fda PM	289	extern void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
bce8032e	290
eb9c7ebe PM	291	#include <net/flow.h>
	292	extern void (ip_nat_decode_session)(struct sk_buff , struct flowi *);
	293
	294	static inline void
	295	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, int family)
	296	{
051578cc	297	#ifdef CONFIG_NF_NAT_NEEDED
eb9c7ebe PM	298	void (decodefn)(struct sk_buff , struct flowi *);
eb9c7ebe PM	299
051578cc PM	300	if (family == AF_INET) {
	301	rcu_read_lock();
	302	decodefn = rcu_dereference(ip_nat_decode_session);
	303	if (decodefn)
	304	decodefn(skb, fl);
	305	rcu_read_unlock();
	306	}
eb9c7ebe PM	307	#endif
	308	}
	309
608c8e4f HW	310	#ifdef CONFIG_PROC_FS
	311	#include <linux/proc_fs.h>
	312	extern struct proc_dir_entry *proc_net_netfilter;
	313	#endif
	314
1da177e4 LT	315	#else /* !CONFIG_NETFILTER */
1da177e4 LT	316	#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb)
48d5cad8	317	#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb)
f53b61d8	318	static inline int nf_hook_thresh(int pf, unsigned int hook,
3db05fea	319	struct sk_buff *skb,
f53b61d8 DM	320	struct net_device *indev,
f53b61d8 DM	321	struct net_device *outdev,
48d5cad8 PM	322	int (okfn)(struct sk_buff ), int thresh,
48d5cad8 PM	323	int cond)
f53b61d8	324	{
3db05fea	325	return okfn(skb);
f53b61d8	326	}
3db05fea	327	static inline int nf_hook(int pf, unsigned int hook, struct sk_buff *skb,
f53b61d8 DM	328	struct net_device indev, struct net_device outdev,
	329	int (okfn)(struct sk_buff ))
	330	{
9c92d348	331	return 1;
f53b61d8	332	}
f53b61d8	333	struct flowi;
eb9c7ebe PM	334	static inline void
eb9c7ebe PM	335	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, int family) {}
1da177e4 LT	336	#endif /CONFIG_NETFILTER/
1da177e4 LT	337
5f79e0f9 YK	338	#if defined(CONFIG_NF_CONNTRACK) \|\| defined(CONFIG_NF_CONNTRACK_MODULE)
	339	extern void (ip_ct_attach)(struct sk_buff , struct sk_buff *);
	340	extern void nf_ct_attach(struct sk_buff , struct sk_buff );
de6e05c4	341	extern void (nf_ct_destroy)(struct nf_conntrack );
5f79e0f9 YK	342	#else
	343	static inline void nf_ct_attach(struct sk_buff new, struct sk_buff skb) {}
	344	#endif
	345
666953df AD	346	static inline struct net nf_pre_routing_net(const struct net_device in,
	347	const struct net_device *out)
	348	{
	349	#ifdef CONFIG_NET_NS
	350	return in->nd_net;
	351	#else
	352	return &init_net;
	353	#endif
	354	}
	355
	356	static inline struct net nf_local_in_net(const struct net_device in,
	357	const struct net_device *out)
	358	{
	359	#ifdef CONFIG_NET_NS
	360	return in->nd_net;
	361	#else
	362	return &init_net;
	363	#endif
	364	}
	365
	366	static inline struct net nf_forward_net(const struct net_device in,
	367	const struct net_device *out)
	368	{
	369	#ifdef CONFIG_NET_NS
	370	BUG_ON(in->nd_net != out->nd_net);
	371	return in->nd_net;
	372	#else
	373	return &init_net;
	374	#endif
	375	}
	376
	377	static inline struct net nf_local_out_net(const struct net_device in,
	378	const struct net_device *out)
	379	{
	380	#ifdef CONFIG_NET_NS
	381	return out->nd_net;
	382	#else
	383	return &init_net;
	384	#endif
	385	}
	386
	387	static inline struct net nf_post_routing_net(const struct net_device in,
	388	const struct net_device *out)
	389	{
	390	#ifdef CONFIG_NET_NS
	391	return out->nd_net;
	392	#else
	393	return &init_net;
	394	#endif
	395	}
	396
1da177e4 LT	397	#endif /__KERNEL__/
1da177e4 LT	398	#endif /__LINUX_NETFILTER_H/