[net-next-2.6.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;
};

/* Each queued (to userspace) skbuff has one of these. */
struct nf_info
{
	/* The ops struct which sent us to userspace. */
	struct nf_hook_ops *elem;
	
	/* If we're sent to userspace, this keeps housekeeping info */
	int pf;
	unsigned int hook;
	struct net_device *indev, *outdev;
	int (*okfn)(struct sk_buff *);
};
                                                                                
/* 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);

/* Packet queuing */
struct nf_queue_handler {
	int (*outfn)(struct sk_buff *skb, struct nf_info *info,
		     unsigned int queuenum, void *data);
	void *data;
	char *name;
};
extern int nf_register_queue_handler(int pf, 
                                     struct nf_queue_handler *qh);
extern int nf_unregister_queue_handler(int pf,
				       struct nf_queue_handler *qh);
extern void nf_unregister_queue_handlers(struct nf_queue_handler *qh);
extern void nf_reinject(struct sk_buff *skb,
			struct nf_info *info,
			unsigned int verdict);

/* 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_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);

#define nf_info_reroute(x) ((void *)x + sizeof(struct nf_info))

#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	};
	103
	104	/* Each queued (to userspace) skbuff has one of these. */
	105	struct nf_info
	106	{
	107	/* The ops struct which sent us to userspace. */
	108	struct nf_hook_ops *elem;
	109
	110	/* If we're sent to userspace, this keeps housekeeping info */
	111	int pf;
	112	unsigned int hook;
	113	struct net_device indev, outdev;
	114	int (okfn)(struct sk_buff );
	115	};
	116
	117	/* Function to register/unregister hook points. */
	118	int nf_register_hook(struct nf_hook_ops *reg);
	119	void nf_unregister_hook(struct nf_hook_ops *reg);
972d1cb1 PM	120	int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
972d1cb1 PM	121	void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);
1da177e4 LT	122
	123	/* Functions to register get/setsockopt ranges (non-inclusive). You
	124	need to check permissions yourself! */
	125	int nf_register_sockopt(struct nf_sockopt_ops *reg);
	126	void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
	127
d62f9ed4 PM	128	#ifdef CONFIG_SYSCTL
	129	/* Sysctl registration */
	130	struct ctl_table_header nf_register_sysctl_table(struct ctl_table path,
	131	struct ctl_table *table);
	132	void nf_unregister_sysctl_table(struct ctl_table_header *header,
	133	struct ctl_table *table);
	134	extern struct ctl_table nf_net_netfilter_sysctl_path[];
	135	extern struct ctl_table nf_net_ipv4_netfilter_sysctl_path[];
	136	#endif /* CONFIG_SYSCTL */
	137
1da177e4 LT	138	extern struct list_head nf_hooks[NPROTO][NF_MAX_HOOKS];
1da177e4 LT	139
608c8e4f HW	140	/* those NF_LOG_* defines and struct nf_loginfo are legacy definitios that will
	141	* disappear once iptables is replaced with pkttables. Please DO NOT use them
	142	* for any new code! */
	143	#define NF_LOG_TCPSEQ 0x01 /* Log TCP sequence numbers */
	144	#define NF_LOG_TCPOPT 0x02 /* Log TCP options */
	145	#define NF_LOG_IPOPT 0x04 /* Log IP options */
	146	#define NF_LOG_UID 0x08 /* Log UID owning local socket */
	147	#define NF_LOG_MASK 0x0f
	148
	149	#define NF_LOG_TYPE_LOG 0x01
	150	#define NF_LOG_TYPE_ULOG 0x02
	151
	152	struct nf_loginfo {
	153	u_int8_t type;
	154	union {
	155	struct {
	156	u_int32_t copy_len;
	157	u_int16_t group;
	158	u_int16_t qthreshold;
	159	} ulog;
	160	struct {
	161	u_int8_t level;
	162	u_int8_t logflags;
	163	} log;
	164	} u;
	165	};
	166
	167	typedef void nf_logfn(unsigned int pf,
	168	unsigned int hooknum,
1da177e4 LT	169	const struct sk_buff *skb,
	170	const struct net_device *in,
	171	const struct net_device *out,
608c8e4f	172	const struct nf_loginfo *li,
1da177e4 LT	173	const char *prefix);
1da177e4 LT	174
608c8e4f HW	175	struct nf_logger {
	176	struct module *me;
	177	nf_logfn *logfn;
	178	char *name;
	179	};
	180
1da177e4	181	/* Function to register/unregister log function. */
608c8e4f	182	int nf_log_register(int pf, struct nf_logger *logger);
e92ad99c	183	void nf_log_unregister(struct nf_logger *logger);
9dc6aa5f	184	void nf_log_unregister_pf(int pf);
1da177e4 LT	185
	186	/* Calls the registered backend logging function */
	187	void nf_log_packet(int pf,
	188	unsigned int hooknum,
	189	const struct sk_buff *skb,
	190	const struct net_device *in,
	191	const struct net_device *out,
608c8e4f	192	struct nf_loginfo *li,
1da177e4	193	const char *fmt, ...);
16a6677f	194
3db05fea	195	int nf_hook_slow(int pf, unsigned int hook, struct sk_buff *skb,
16a6677f PM	196	struct net_device indev, struct net_device outdev,
	197	int (okfn)(struct sk_buff ), int thresh);
	198
	199	/**
	200	* nf_hook_thresh - call a netfilter hook
	201	*
	202	* Returns 1 if the hook has allowed the packet to pass. The function
	203	* okfn must be invoked by the caller in this case. Any other return
	204	* value indicates the packet has been consumed by the hook.
	205	*/
	206	static inline int nf_hook_thresh(int pf, unsigned int hook,
3db05fea	207	struct sk_buff *skb,
16a6677f PM	208	struct net_device *indev,
16a6677f PM	209	struct net_device *outdev,
48d5cad8 PM	210	int (okfn)(struct sk_buff ), int thresh,
48d5cad8 PM	211	int cond)
16a6677f	212	{
48d5cad8 PM	213	if (!cond)
48d5cad8 PM	214	return 1;
16a6677f PM	215	#ifndef CONFIG_NETFILTER_DEBUG
	216	if (list_empty(&nf_hooks[pf][hook]))
	217	return 1;
	218	#endif
3db05fea	219	return nf_hook_slow(pf, hook, skb, indev, outdev, okfn, thresh);
16a6677f PM	220	}
16a6677f PM	221
3db05fea	222	static inline int nf_hook(int pf, unsigned int hook, struct sk_buff *skb,
16a6677f PM	223	struct net_device indev, struct net_device outdev,
	224	int (okfn)(struct sk_buff ))
	225	{
3db05fea	226	return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN, 1);
16a6677f	227	}
1da177e4 LT	228
	229	/* Activate hook; either okfn or kfree_skb called, unless a hook
	230	returns NF_STOLEN (in which case, it's up to the hook to deal with
	231	the consequences).
	232
	233	Returns -ERRNO if packet dropped. Zero means queued, stolen or
	234	accepted.
	235	*/
	236
	237	/* RR:
	238	> I don't want nf_hook to return anything because people might forget
	239	> about async and trust the return value to mean "packet was ok".
	240
	241	AK:
	242	Just document it clearly, then you can expect some sense from kernel
	243	coders :)
	244	*/
	245
	246	/* This is gross, but inline doesn't cut it for avoiding the function
	247	call in fast path: gcc doesn't inline (needs value tracking?). --RR */
16a6677f PM	248
	249	/* HX: It's slightly less gross now. */
	250
1da177e4 LT	251	#define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh) \
1da177e4 LT	252	({int __ret; \
3db05fea	253	if ((__ret=nf_hook_thresh(pf, hook, (skb), indev, outdev, okfn, thresh, 1)) == 1)\
48d5cad8 PM	254	__ret = (okfn)(skb); \
	255	__ret;})
	256
	257	#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) \
	258	({int __ret; \
3db05fea	259	if ((__ret=nf_hook_thresh(pf, hook, (skb), indev, outdev, okfn, INT_MIN, cond)) == 1)\
1da177e4 LT	260	__ret = (okfn)(skb); \
1da177e4 LT	261	__ret;})
1da177e4	262
16a6677f PM	263	#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) \
16a6677f PM	264	NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, INT_MIN)
1da177e4 LT	265
	266	/* Call setsockopt() */
	267	int nf_setsockopt(struct sock sk, int pf, int optval, char __user opt,
	268	int len);
	269	int nf_getsockopt(struct sock sk, int pf, int optval, char __user opt,
	270	int *len);
	271
3fdadf7d DM	272	int compat_nf_setsockopt(struct sock *sk, int pf, int optval,
	273	char __user *opt, int len);
	274	int compat_nf_getsockopt(struct sock *sk, int pf, int optval,
	275	char __user opt, int len);
	276
1da177e4	277	/* Packet queuing */
bbd86b9f HW	278	struct nf_queue_handler {
	279	int (outfn)(struct sk_buff skb, struct nf_info *info,
	280	unsigned int queuenum, void *data);
	281	void *data;
	282	char *name;
	283	};
1da177e4	284	extern int nf_register_queue_handler(int pf,
bbd86b9f	285	struct nf_queue_handler *qh);
ce7663d8 YK	286	extern int nf_unregister_queue_handler(int pf,
ce7663d8 YK	287	struct nf_queue_handler *qh);
bbd86b9f	288	extern void nf_unregister_queue_handlers(struct nf_queue_handler *qh);
1da177e4 LT	289	extern void nf_reinject(struct sk_buff *skb,
	290	struct nf_info *info,
	291	unsigned int verdict);
	292
1da177e4 LT	293	/* FIXME: Before cache is ever used, this must be implemented for real. */
	294	extern void nf_invalidate_cache(int pf);
	295
089af26c HW	296	/* Call this before modifying an existing packet: ensures it is
	297	modifiable and linear to the point you care about (writable_len).
	298	Returns true or false. */
37d41879	299	extern int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);
089af26c	300
1841a4c7	301	struct flowi;
bce8032e PM	302	struct nf_afinfo {
bce8032e PM	303	unsigned short family;
b51655b9	304	__sum16 (checksum)(struct sk_buff skb, unsigned int hook,
422c346f	305	unsigned int dataoff, u_int8_t protocol);
1841a4c7	306	int (route)(struct dst_entry dst, struct flowi fl);
bce8032e PM	307	void (saveroute)(const struct sk_buff skb,
bce8032e PM	308	struct nf_info *info);
3db05fea	309	int (reroute)(struct sk_buff skb,
bce8032e PM	310	const struct nf_info *info);
bce8032e PM	311	int route_key_size;
2cc7d573 HW	312	};
2cc7d573 HW	313
bce8032e PM	314	extern struct nf_afinfo *nf_afinfo[];
	315	static inline struct nf_afinfo *nf_get_afinfo(unsigned short family)
	316	{
	317	return rcu_dereference(nf_afinfo[family]);
	318	}
2cc7d573	319
b51655b9	320	static inline __sum16
422c346f PM	321	nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
	322	u_int8_t protocol, unsigned short family)
	323	{
	324	struct nf_afinfo *afinfo;
b51655b9	325	__sum16 csum = 0;
422c346f PM	326
	327	rcu_read_lock();
	328	afinfo = nf_get_afinfo(family);
	329	if (afinfo)
	330	csum = afinfo->checksum(skb, hook, dataoff, protocol);
	331	rcu_read_unlock();
	332	return csum;
	333	}
	334
bce8032e PM	335	extern int nf_register_afinfo(struct nf_afinfo *afinfo);
	336	extern void nf_unregister_afinfo(struct nf_afinfo *afinfo);
	337
	338	#define nf_info_reroute(x) ((void *)x + sizeof(struct nf_info))
2cc7d573	339
eb9c7ebe PM	340	#include <net/flow.h>
	341	extern void (ip_nat_decode_session)(struct sk_buff , struct flowi *);
	342
	343	static inline void
	344	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, int family)
	345	{
5b1158e9	346	#if defined(CONFIG_IP_NF_NAT_NEEDED) \|\| defined(CONFIG_NF_NAT_NEEDED)
eb9c7ebe PM	347	void (decodefn)(struct sk_buff , struct flowi *);
	348
	349	if (family == AF_INET && (decodefn = ip_nat_decode_session) != NULL)
	350	decodefn(skb, fl);
	351	#endif
	352	}
	353
608c8e4f HW	354	#ifdef CONFIG_PROC_FS
	355	#include <linux/proc_fs.h>
	356	extern struct proc_dir_entry *proc_net_netfilter;
	357	#endif
	358
1da177e4 LT	359	#else /* !CONFIG_NETFILTER */
1da177e4 LT	360	#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb)
48d5cad8	361	#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb)
f53b61d8	362	static inline int nf_hook_thresh(int pf, unsigned int hook,
3db05fea	363	struct sk_buff *skb,
f53b61d8 DM	364	struct net_device *indev,
f53b61d8 DM	365	struct net_device *outdev,
48d5cad8 PM	366	int (okfn)(struct sk_buff ), int thresh,
48d5cad8 PM	367	int cond)
f53b61d8	368	{
3db05fea	369	return okfn(skb);
f53b61d8	370	}
3db05fea	371	static inline int nf_hook(int pf, unsigned int hook, struct sk_buff *skb,
f53b61d8 DM	372	struct net_device indev, struct net_device outdev,
	373	int (okfn)(struct sk_buff ))
	374	{
9c92d348	375	return 1;
f53b61d8	376	}
f53b61d8	377	struct flowi;
eb9c7ebe PM	378	static inline void
eb9c7ebe PM	379	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, int family) {}
1da177e4 LT	380	#endif /CONFIG_NETFILTER/
1da177e4 LT	381
5f79e0f9 YK	382	#if defined(CONFIG_NF_CONNTRACK) \|\| defined(CONFIG_NF_CONNTRACK_MODULE)
	383	extern void (ip_ct_attach)(struct sk_buff , struct sk_buff *);
	384	extern void nf_ct_attach(struct sk_buff , struct sk_buff );
de6e05c4	385	extern void (nf_ct_destroy)(struct nf_conntrack );
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/