[deliverable/linux.git] / include / linux / netfilter.h

#ifndef __LINUX_NETFILTER_H
#define __LINUX_NETFILTER_H

#ifdef __KERNEL__
#include <linux/init.h>
#include <linux/types.h>
#include <linux/skbuff.h>
#include <linux/net.h>
#include <linux/if.h>
#include <linux/wait.h>
#include <linux/list.h>
#endif
#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_QBITS) & 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
};

#ifdef __KERNEL__
#ifdef CONFIG_NETFILTER

extern void netfilter_init(void);

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

struct sk_buff;
struct net_device;

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 */
struct ctl_table_header *nf_register_sysctl_table(struct ctl_table *path,
						  struct ctl_table *table);
void nf_unregister_sysctl_table(struct ctl_table_header *header,
				struct ctl_table *table);
extern struct ctl_table nf_net_netfilter_sysctl_path[];
extern struct ctl_table nf_net_ipv4_netfilter_sysctl_path[];
#endif /* CONFIG_SYSCTL */

extern struct list_head nf_hooks[NPROTO][NF_MAX_HOOKS];

/* those NF_LOG_* defines and struct nf_loginfo are legacy definitios that will
 * disappear once iptables is replaced with pkttables.  Please DO NOT use them
 * for any new code! */
#define NF_LOG_TCPSEQ		0x01	/* Log TCP sequence numbers */
#define NF_LOG_TCPOPT		0x02	/* Log TCP options */
#define NF_LOG_IPOPT		0x04	/* Log IP options */
#define NF_LOG_UID		0x08	/* Log UID owning local socket */
#define NF_LOG_MASK		0x0f

#define NF_LOG_TYPE_LOG		0x01
#define NF_LOG_TYPE_ULOG	0x02

struct nf_loginfo {
	u_int8_t type;
	union {
		struct {
			u_int32_t copy_len;
			u_int16_t group;
			u_int16_t qthreshold;
		} ulog;
		struct {
			u_int8_t level;
			u_int8_t logflags;
		} log;
	} u;
};

typedef void nf_logfn(unsigned int pf,
		      unsigned int hooknum,
		      const struct sk_buff *skb,
		      const struct net_device *in,
		      const struct net_device *out,
		      const struct nf_loginfo *li,
		      const char *prefix);

struct nf_logger {
	struct module	*me;
	nf_logfn 	*logfn;
	char		*name;
};

/* Function to register/unregister log function. */
int nf_log_register(int pf, struct nf_logger *logger);
void nf_log_unregister(struct nf_logger *logger);
void nf_log_unregister_pf(int pf);

/* Calls the registered backend logging function */
void nf_log_packet(int pf,
		   unsigned int hooknum,
		   const struct sk_buff *skb,
		   const struct net_device *in,
		   const struct net_device *out,
		   struct nf_loginfo *li,
		   const char *fmt, ...);

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);

/* FIXME: Before cache is ever used, this must be implemented for real. */
extern void nf_invalidate_cache(int pf);

/* 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_info;

struct nf_afinfo {
	unsigned short	family;
	__sum16		(*checksum)(struct sk_buff *skb, unsigned int hook,
				    unsigned int dataoff, u_int8_t protocol);
	int		(*route)(struct dst_entry **dst, struct flowi *fl);
	void		(*saveroute)(const struct sk_buff *skb,
				     struct nf_info *info);
	int		(*reroute)(struct sk_buff *skb,
				   const struct nf_info *info);
	int		route_key_size;
};

extern struct nf_afinfo *nf_afinfo[];
static inline 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)
{
	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;
}

extern int nf_register_afinfo(struct nf_afinfo *afinfo);
extern void nf_unregister_afinfo(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)
{
#if defined(CONFIG_IP_NF_NAT_NEEDED) || defined(CONFIG_NF_NAT_NEEDED)
	void (*decodefn)(struct sk_buff *, struct flowi *);

	if (family == AF_INET && (decodefn = ip_nat_decode_session) != NULL)
		decodefn(skb, fl);
#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

#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>
	6	#include <linux/types.h>
	7	#include <linux/skbuff.h>
	8	#include <linux/net.h>
	9	#include <linux/if.h>
	10	#include <linux/wait.h>
	11	#include <linux/list.h>
	12	#endif
	13	#include <linux/compiler.h>
	14
	15	/* Responses from hook functions. */
	16	#define NF_DROP 0
	17	#define NF_ACCEPT 1
	18	#define NF_STOLEN 2
	19	#define NF_QUEUE 3
	20	#define NF_REPEAT 4
	21	#define NF_STOP 5
	22	#define NF_MAX_VERDICT NF_STOP
	23
0ab43f84 HW	24	/* we overload the higher bits for encoding auxiliary data such as the queue
	25	* number. Not nice, but better than additional function arguments. */
	26	#define NF_VERDICT_MASK 0x0000ffff
	27	#define NF_VERDICT_BITS 16
	28
	29	#define NF_VERDICT_QMASK 0xffff0000
	30	#define NF_VERDICT_QBITS 16
	31
b766b305	32	#define NF_QUEUE_NR(x) (((x << NF_VERDICT_QBITS) & NF_VERDICT_QMASK) \| NF_QUEUE)
0ab43f84	33
6869c4d8 HW	34	/* only for userspace compatibility */
6869c4d8 HW	35	#ifndef __KERNEL__
1da177e4 LT	36	/* Generic cache responses from hook functions.
	37	<= 0x2000 is used for protocol-flags. */
	38	#define NFC_UNKNOWN 0x4000
	39	#define NFC_ALTERED 0x8000
6869c4d8	40	#endif
1da177e4	41
6e23ae2a PM	42	enum nf_inet_hooks {
	43	NF_INET_PRE_ROUTING,
	44	NF_INET_LOCAL_IN,
	45	NF_INET_FORWARD,
	46	NF_INET_LOCAL_OUT,
	47	NF_INET_POST_ROUTING,
	48	NF_INET_NUMHOOKS
	49	};
	50
1da177e4	51	#ifdef __KERNEL__
1da177e4 LT	52	#ifdef CONFIG_NETFILTER
	53
	54	extern void netfilter_init(void);
	55
	56	/* Largest hook number + 1 */
	57	#define NF_MAX_HOOKS 8
	58
	59	struct sk_buff;
	60	struct net_device;
	61
	62	typedef unsigned int nf_hookfn(unsigned int hooknum,
3db05fea	63	struct sk_buff *skb,
1da177e4 LT	64	const struct net_device *in,
	65	const struct net_device *out,
	66	int (okfn)(struct sk_buff ));
	67
	68	struct nf_hook_ops
	69	{
	70	struct list_head list;
	71
	72	/* User fills in from here down. */
	73	nf_hookfn *hook;
	74	struct module *owner;
	75	int pf;
	76	int hooknum;
	77	/* Hooks are ordered in ascending priority. */
	78	int priority;
	79	};
	80
	81	struct nf_sockopt_ops
	82	{
	83	struct list_head list;
	84
	85	int pf;
	86
	87	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
	88	int set_optmin;
	89	int set_optmax;
	90	int (set)(struct sock sk, int optval, void __user *user, unsigned int len);
3fdadf7d DM	91	int (compat_set)(struct sock sk, int optval,
3fdadf7d DM	92	void __user *user, unsigned int len);
1da177e4 LT	93
	94	int get_optmin;
	95	int get_optmax;
	96	int (get)(struct sock sk, int optval, void __user user, int len);
3fdadf7d DM	97	int (compat_get)(struct sock sk, int optval,
3fdadf7d DM	98	void __user user, int len);
1da177e4	99
16fcec35 NH	100	/* Use the module struct to lock set/get code in place */
16fcec35 NH	101	struct module *owner;
1da177e4 LT	102	};
1da177e4 LT	103
1da177e4 LT	104	/* Function to register/unregister hook points. */
	105	int nf_register_hook(struct nf_hook_ops *reg);
	106	void nf_unregister_hook(struct nf_hook_ops *reg);
972d1cb1 PM	107	int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
972d1cb1 PM	108	void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);
1da177e4 LT	109
	110	/* Functions to register get/setsockopt ranges (non-inclusive). You
	111	need to check permissions yourself! */
	112	int nf_register_sockopt(struct nf_sockopt_ops *reg);
	113	void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
	114
d62f9ed4 PM	115	#ifdef CONFIG_SYSCTL
	116	/* Sysctl registration */
	117	struct ctl_table_header nf_register_sysctl_table(struct ctl_table path,
	118	struct ctl_table *table);
	119	void nf_unregister_sysctl_table(struct ctl_table_header *header,
	120	struct ctl_table *table);
	121	extern struct ctl_table nf_net_netfilter_sysctl_path[];
	122	extern struct ctl_table nf_net_ipv4_netfilter_sysctl_path[];
	123	#endif /* CONFIG_SYSCTL */
	124
1da177e4 LT	125	extern struct list_head nf_hooks[NPROTO][NF_MAX_HOOKS];
1da177e4 LT	126
608c8e4f HW	127	/* those NF_LOG_* defines and struct nf_loginfo are legacy definitios that will
	128	* disappear once iptables is replaced with pkttables. Please DO NOT use them
	129	* for any new code! */
	130	#define NF_LOG_TCPSEQ 0x01 /* Log TCP sequence numbers */
	131	#define NF_LOG_TCPOPT 0x02 /* Log TCP options */
	132	#define NF_LOG_IPOPT 0x04 /* Log IP options */
	133	#define NF_LOG_UID 0x08 /* Log UID owning local socket */
	134	#define NF_LOG_MASK 0x0f
	135
	136	#define NF_LOG_TYPE_LOG 0x01
	137	#define NF_LOG_TYPE_ULOG 0x02
	138
	139	struct nf_loginfo {
	140	u_int8_t type;
	141	union {
	142	struct {
	143	u_int32_t copy_len;
	144	u_int16_t group;
	145	u_int16_t qthreshold;
	146	} ulog;
	147	struct {
	148	u_int8_t level;
	149	u_int8_t logflags;
	150	} log;
	151	} u;
	152	};
	153
	154	typedef void nf_logfn(unsigned int pf,
	155	unsigned int hooknum,
1da177e4 LT	156	const struct sk_buff *skb,
	157	const struct net_device *in,
	158	const struct net_device *out,
608c8e4f	159	const struct nf_loginfo *li,
1da177e4 LT	160	const char *prefix);
1da177e4 LT	161
608c8e4f HW	162	struct nf_logger {
	163	struct module *me;
	164	nf_logfn *logfn;
	165	char *name;
	166	};
	167
1da177e4	168	/* Function to register/unregister log function. */
608c8e4f	169	int nf_log_register(int pf, struct nf_logger *logger);
e92ad99c	170	void nf_log_unregister(struct nf_logger *logger);
9dc6aa5f	171	void nf_log_unregister_pf(int pf);
1da177e4 LT	172
	173	/* Calls the registered backend logging function */
	174	void nf_log_packet(int pf,
	175	unsigned int hooknum,
	176	const struct sk_buff *skb,
	177	const struct net_device *in,
	178	const struct net_device *out,
608c8e4f	179	struct nf_loginfo *li,
1da177e4	180	const char *fmt, ...);
16a6677f	181
3db05fea	182	int nf_hook_slow(int pf, unsigned int hook, struct sk_buff *skb,
16a6677f PM	183	struct net_device indev, struct net_device outdev,
	184	int (okfn)(struct sk_buff ), int thresh);
	185
	186	/**
	187	* nf_hook_thresh - call a netfilter hook
	188	*
	189	* Returns 1 if the hook has allowed the packet to pass. The function
	190	* okfn must be invoked by the caller in this case. Any other return
	191	* value indicates the packet has been consumed by the hook.
	192	*/
	193	static inline int nf_hook_thresh(int pf, unsigned int hook,
3db05fea	194	struct sk_buff *skb,
16a6677f PM	195	struct net_device *indev,
16a6677f PM	196	struct net_device *outdev,
48d5cad8 PM	197	int (okfn)(struct sk_buff ), int thresh,
48d5cad8 PM	198	int cond)
16a6677f	199	{
48d5cad8 PM	200	if (!cond)
48d5cad8 PM	201	return 1;
16a6677f PM	202	#ifndef CONFIG_NETFILTER_DEBUG
	203	if (list_empty(&nf_hooks[pf][hook]))
	204	return 1;
	205	#endif
3db05fea	206	return nf_hook_slow(pf, hook, skb, indev, outdev, okfn, thresh);
16a6677f PM	207	}
16a6677f PM	208
3db05fea	209	static inline int nf_hook(int pf, unsigned int hook, struct sk_buff *skb,
16a6677f PM	210	struct net_device indev, struct net_device outdev,
	211	int (okfn)(struct sk_buff ))
	212	{
3db05fea	213	return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN, 1);
16a6677f	214	}
1da177e4 LT	215
	216	/* Activate hook; either okfn or kfree_skb called, unless a hook
	217	returns NF_STOLEN (in which case, it's up to the hook to deal with
	218	the consequences).
	219
	220	Returns -ERRNO if packet dropped. Zero means queued, stolen or
	221	accepted.
	222	*/
	223
	224	/* RR:
	225	> I don't want nf_hook to return anything because people might forget
	226	> about async and trust the return value to mean "packet was ok".
	227
	228	AK:
	229	Just document it clearly, then you can expect some sense from kernel
	230	coders :)
	231	*/
	232
	233	/* This is gross, but inline doesn't cut it for avoiding the function
	234	call in fast path: gcc doesn't inline (needs value tracking?). --RR */
16a6677f PM	235
	236	/* HX: It's slightly less gross now. */
	237
1da177e4 LT	238	#define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh) \
1da177e4 LT	239	({int __ret; \
3db05fea	240	if ((__ret=nf_hook_thresh(pf, hook, (skb), indev, outdev, okfn, thresh, 1)) == 1)\
48d5cad8 PM	241	__ret = (okfn)(skb); \
	242	__ret;})
	243
	244	#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) \
	245	({int __ret; \
3db05fea	246	if ((__ret=nf_hook_thresh(pf, hook, (skb), indev, outdev, okfn, INT_MIN, cond)) == 1)\
1da177e4 LT	247	__ret = (okfn)(skb); \
1da177e4 LT	248	__ret;})
1da177e4	249
16a6677f PM	250	#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) \
16a6677f PM	251	NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, INT_MIN)
1da177e4 LT	252
	253	/* Call setsockopt() */
	254	int nf_setsockopt(struct sock sk, int pf, int optval, char __user opt,
	255	int len);
	256	int nf_getsockopt(struct sock sk, int pf, int optval, char __user opt,
	257	int *len);
	258
3fdadf7d DM	259	int compat_nf_setsockopt(struct sock *sk, int pf, int optval,
	260	char __user *opt, int len);
	261	int compat_nf_getsockopt(struct sock *sk, int pf, int optval,
	262	char __user opt, int len);
	263
1da177e4 LT	264	/* FIXME: Before cache is ever used, this must be implemented for real. */
	265	extern void nf_invalidate_cache(int pf);
	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;
c01cd429 PM	273	struct nf_info;
c01cd429 PM	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);
1841a4c7	279	int (route)(struct dst_entry dst, struct flowi fl);
bce8032e PM	280	void (saveroute)(const struct sk_buff skb,
bce8032e PM	281	struct nf_info *info);
3db05fea	282	int (reroute)(struct sk_buff skb,
bce8032e PM	283	const struct nf_info *info);
bce8032e PM	284	int route_key_size;
2cc7d573 HW	285	};
2cc7d573 HW	286
bce8032e PM	287	extern struct nf_afinfo *nf_afinfo[];
	288	static inline struct nf_afinfo *nf_get_afinfo(unsigned short family)
	289	{
	290	return rcu_dereference(nf_afinfo[family]);
	291	}
2cc7d573	292
b51655b9	293	static inline __sum16
422c346f PM	294	nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
	295	u_int8_t protocol, unsigned short family)
	296	{
	297	struct nf_afinfo *afinfo;
b51655b9	298	__sum16 csum = 0;
422c346f PM	299
	300	rcu_read_lock();
	301	afinfo = nf_get_afinfo(family);
	302	if (afinfo)
	303	csum = afinfo->checksum(skb, hook, dataoff, protocol);
	304	rcu_read_unlock();
	305	return csum;
	306	}
	307
bce8032e PM	308	extern int nf_register_afinfo(struct nf_afinfo *afinfo);
	309	extern void nf_unregister_afinfo(struct nf_afinfo *afinfo);
	310
eb9c7ebe PM	311	#include <net/flow.h>
	312	extern void (ip_nat_decode_session)(struct sk_buff , struct flowi *);
	313
	314	static inline void
	315	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, int family)
	316	{
5b1158e9	317	#if defined(CONFIG_IP_NF_NAT_NEEDED) \|\| defined(CONFIG_NF_NAT_NEEDED)
eb9c7ebe PM	318	void (decodefn)(struct sk_buff , struct flowi *);
	319
	320	if (family == AF_INET && (decodefn = ip_nat_decode_session) != NULL)
	321	decodefn(skb, fl);
	322	#endif
	323	}
	324
608c8e4f HW	325	#ifdef CONFIG_PROC_FS
	326	#include <linux/proc_fs.h>
	327	extern struct proc_dir_entry *proc_net_netfilter;
	328	#endif
	329
1da177e4 LT	330	#else /* !CONFIG_NETFILTER */
1da177e4 LT	331	#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb)
48d5cad8	332	#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb)
f53b61d8	333	static inline int nf_hook_thresh(int pf, unsigned int hook,
3db05fea	334	struct sk_buff *skb,
f53b61d8 DM	335	struct net_device *indev,
f53b61d8 DM	336	struct net_device *outdev,
48d5cad8 PM	337	int (okfn)(struct sk_buff ), int thresh,
48d5cad8 PM	338	int cond)
f53b61d8	339	{
3db05fea	340	return okfn(skb);
f53b61d8	341	}
3db05fea	342	static inline int nf_hook(int pf, unsigned int hook, struct sk_buff *skb,
f53b61d8 DM	343	struct net_device indev, struct net_device outdev,
	344	int (okfn)(struct sk_buff ))
	345	{
9c92d348	346	return 1;
f53b61d8	347	}
f53b61d8	348	struct flowi;
eb9c7ebe PM	349	static inline void
eb9c7ebe PM	350	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, int family) {}
1da177e4 LT	351	#endif /CONFIG_NETFILTER/
1da177e4 LT	352
5f79e0f9 YK	353	#if defined(CONFIG_NF_CONNTRACK) \|\| defined(CONFIG_NF_CONNTRACK_MODULE)
	354	extern void (ip_ct_attach)(struct sk_buff , struct sk_buff *);
	355	extern void nf_ct_attach(struct sk_buff , struct sk_buff );
de6e05c4	356	extern void (nf_ct_destroy)(struct nf_conntrack );
5f79e0f9 YK	357	#else
	358	static inline void nf_ct_attach(struct sk_buff new, struct sk_buff skb) {}
	359	#endif
	360
1da177e4 LT	361	#endif /__KERNEL__/
1da177e4 LT	362	#endif /__LINUX_NETFILTER_H/