[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/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

#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);

	/* Number of users inside set() or get(). */
	unsigned int use;
	struct task_struct *cleanup_task;
};

/* 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 **pskb,
		 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 **pskb,
				 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, pskb, indev, outdev, okfn, thresh);
}

static inline int nf_hook(int pf, unsigned int hook, struct sk_buff **pskb,
			  struct net_device *indev, struct net_device *outdev,
			  int (*okfn)(struct sk_buff *))
{
	return nf_hook_thresh(pf, hook, pskb, 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);
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 **pskb, unsigned int writable_len);

static inline void nf_csum_replace4(__sum16 *sum, __be32 from, __be32 to)
{
	__be32 diff[] = { ~from, to };

	*sum = csum_fold(csum_partial((char *)diff, sizeof(diff), ~csum_unfold(*sum)));
}

static inline void nf_csum_replace2(__sum16 *sum, __be16 from, __be16 to)
{
	nf_csum_replace4(sum, (__force __be32)from, (__force __be32)to);
}

extern void nf_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
				      __be32 from, __be32 to, int pseudohdr);

static inline void nf_proto_csum_replace2(__sum16 *sum, struct sk_buff *skb,
				      __be16 from, __be16 to, int pseudohdr)
{
	nf_proto_csum_replace4(sum, skb, (__force __be32)from,
				(__force __be32)to, pseudohdr);
}

struct nf_afinfo {
	unsigned short	family;
	__sum16		(*checksum)(struct sk_buff *skb, unsigned int hook,
				    unsigned int dataoff, u_int8_t protocol);
	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 **pskb,
				 struct net_device *indev,
				 struct net_device *outdev,
				 int (*okfn)(struct sk_buff *), int thresh,
				 int cond)
{
	return okfn(*pskb);
}
static inline int nf_hook(int pf, unsigned int hook, struct sk_buff **pskb,
			  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 *);
#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 LT	41
1da177e4 LT	42	#ifdef __KERNEL__
1da177e4 LT	43	#ifdef CONFIG_NETFILTER
	44
	45	extern void netfilter_init(void);
	46
	47	/* Largest hook number + 1 */
	48	#define NF_MAX_HOOKS 8
	49
	50	struct sk_buff;
	51	struct net_device;
	52
	53	typedef unsigned int nf_hookfn(unsigned int hooknum,
	54	struct sk_buff **skb,
	55	const struct net_device *in,
	56	const struct net_device *out,
	57	int (okfn)(struct sk_buff ));
	58
	59	struct nf_hook_ops
	60	{
	61	struct list_head list;
	62
	63	/* User fills in from here down. */
	64	nf_hookfn *hook;
	65	struct module *owner;
	66	int pf;
	67	int hooknum;
	68	/* Hooks are ordered in ascending priority. */
	69	int priority;
	70	};
	71
	72	struct nf_sockopt_ops
	73	{
	74	struct list_head list;
	75
	76	int pf;
	77
	78	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
	79	int set_optmin;
	80	int set_optmax;
	81	int (set)(struct sock sk, int optval, void __user *user, unsigned int len);
3fdadf7d DM	82	int (compat_set)(struct sock sk, int optval,
3fdadf7d DM	83	void __user *user, unsigned int len);
1da177e4 LT	84
	85	int get_optmin;
	86	int get_optmax;
	87	int (get)(struct sock sk, int optval, void __user user, int len);
3fdadf7d DM	88	int (compat_get)(struct sock sk, int optval,
3fdadf7d DM	89	void __user user, int len);
1da177e4 LT	90
	91	/* Number of users inside set() or get(). */
	92	unsigned int use;
	93	struct task_struct *cleanup_task;
	94	};
	95
	96	/* Each queued (to userspace) skbuff has one of these. */
	97	struct nf_info
	98	{
	99	/* The ops struct which sent us to userspace. */
	100	struct nf_hook_ops *elem;
	101
	102	/* If we're sent to userspace, this keeps housekeeping info */
	103	int pf;
	104	unsigned int hook;
	105	struct net_device indev, outdev;
	106	int (okfn)(struct sk_buff );
	107	};
	108
	109	/* Function to register/unregister hook points. */
	110	int nf_register_hook(struct nf_hook_ops *reg);
	111	void nf_unregister_hook(struct nf_hook_ops *reg);
972d1cb1 PM	112	int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
972d1cb1 PM	113	void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);
1da177e4 LT	114
	115	/* Functions to register get/setsockopt ranges (non-inclusive). You
	116	need to check permissions yourself! */
	117	int nf_register_sockopt(struct nf_sockopt_ops *reg);
	118	void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
	119
d62f9ed4 PM	120	#ifdef CONFIG_SYSCTL
	121	/* Sysctl registration */
	122	struct ctl_table_header nf_register_sysctl_table(struct ctl_table path,
	123	struct ctl_table *table);
	124	void nf_unregister_sysctl_table(struct ctl_table_header *header,
	125	struct ctl_table *table);
	126	extern struct ctl_table nf_net_netfilter_sysctl_path[];
	127	extern struct ctl_table nf_net_ipv4_netfilter_sysctl_path[];
	128	#endif /* CONFIG_SYSCTL */
	129
1da177e4 LT	130	extern struct list_head nf_hooks[NPROTO][NF_MAX_HOOKS];
1da177e4 LT	131
608c8e4f HW	132	/* those NF_LOG_* defines and struct nf_loginfo are legacy definitios that will
	133	* disappear once iptables is replaced with pkttables. Please DO NOT use them
	134	* for any new code! */
	135	#define NF_LOG_TCPSEQ 0x01 /* Log TCP sequence numbers */
	136	#define NF_LOG_TCPOPT 0x02 /* Log TCP options */
	137	#define NF_LOG_IPOPT 0x04 /* Log IP options */
	138	#define NF_LOG_UID 0x08 /* Log UID owning local socket */
	139	#define NF_LOG_MASK 0x0f
	140
	141	#define NF_LOG_TYPE_LOG 0x01
	142	#define NF_LOG_TYPE_ULOG 0x02
	143
	144	struct nf_loginfo {
	145	u_int8_t type;
	146	union {
	147	struct {
	148	u_int32_t copy_len;
	149	u_int16_t group;
	150	u_int16_t qthreshold;
	151	} ulog;
	152	struct {
	153	u_int8_t level;
	154	u_int8_t logflags;
	155	} log;
	156	} u;
	157	};
	158
	159	typedef void nf_logfn(unsigned int pf,
	160	unsigned int hooknum,
1da177e4 LT	161	const struct sk_buff *skb,
	162	const struct net_device *in,
	163	const struct net_device *out,
608c8e4f	164	const struct nf_loginfo *li,
1da177e4 LT	165	const char *prefix);
1da177e4 LT	166
608c8e4f HW	167	struct nf_logger {
	168	struct module *me;
	169	nf_logfn *logfn;
	170	char *name;
	171	};
	172
1da177e4	173	/* Function to register/unregister log function. */
608c8e4f	174	int nf_log_register(int pf, struct nf_logger *logger);
e92ad99c	175	void nf_log_unregister(struct nf_logger *logger);
9dc6aa5f	176	void nf_log_unregister_pf(int pf);
1da177e4 LT	177
	178	/* Calls the registered backend logging function */
	179	void nf_log_packet(int pf,
	180	unsigned int hooknum,
	181	const struct sk_buff *skb,
	182	const struct net_device *in,
	183	const struct net_device *out,
608c8e4f	184	struct nf_loginfo *li,
1da177e4	185	const char *fmt, ...);
16a6677f PM	186
	187	int nf_hook_slow(int pf, unsigned int hook, struct sk_buff **pskb,
	188	struct net_device indev, struct net_device outdev,
	189	int (okfn)(struct sk_buff ), int thresh);
	190
	191	/**
	192	* nf_hook_thresh - call a netfilter hook
	193	*
	194	* Returns 1 if the hook has allowed the packet to pass. The function
	195	* okfn must be invoked by the caller in this case. Any other return
	196	* value indicates the packet has been consumed by the hook.
	197	*/
	198	static inline int nf_hook_thresh(int pf, unsigned int hook,
	199	struct sk_buff **pskb,
	200	struct net_device *indev,
	201	struct net_device *outdev,
48d5cad8 PM	202	int (okfn)(struct sk_buff ), int thresh,
48d5cad8 PM	203	int cond)
16a6677f	204	{
48d5cad8 PM	205	if (!cond)
48d5cad8 PM	206	return 1;
16a6677f PM	207	#ifndef CONFIG_NETFILTER_DEBUG
	208	if (list_empty(&nf_hooks[pf][hook]))
	209	return 1;
	210	#endif
	211	return nf_hook_slow(pf, hook, pskb, indev, outdev, okfn, thresh);
	212	}
	213
	214	static inline int nf_hook(int pf, unsigned int hook, struct sk_buff **pskb,
	215	struct net_device indev, struct net_device outdev,
	216	int (okfn)(struct sk_buff ))
	217	{
48d5cad8	218	return nf_hook_thresh(pf, hook, pskb, indev, outdev, okfn, INT_MIN, 1);
16a6677f	219	}
1da177e4 LT	220
	221	/* Activate hook; either okfn or kfree_skb called, unless a hook
	222	returns NF_STOLEN (in which case, it's up to the hook to deal with
	223	the consequences).
	224
	225	Returns -ERRNO if packet dropped. Zero means queued, stolen or
	226	accepted.
	227	*/
	228
	229	/* RR:
	230	> I don't want nf_hook to return anything because people might forget
	231	> about async and trust the return value to mean "packet was ok".
	232
	233	AK:
	234	Just document it clearly, then you can expect some sense from kernel
	235	coders :)
	236	*/
	237
	238	/* This is gross, but inline doesn't cut it for avoiding the function
	239	call in fast path: gcc doesn't inline (needs value tracking?). --RR */
16a6677f PM	240
	241	/* HX: It's slightly less gross now. */
	242
1da177e4 LT	243	#define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh) \
1da177e4 LT	244	({int __ret; \
48d5cad8 PM	245	if ((__ret=nf_hook_thresh(pf, hook, &(skb), indev, outdev, okfn, thresh, 1)) == 1)\
	246	__ret = (okfn)(skb); \
	247	__ret;})
	248
	249	#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) \
	250	({int __ret; \
	251	if ((__ret=nf_hook_thresh(pf, hook, &(skb), indev, outdev, okfn, INT_MIN, cond)) == 1)\
1da177e4 LT	252	__ret = (okfn)(skb); \
1da177e4 LT	253	__ret;})
1da177e4	254
16a6677f PM	255	#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) \
16a6677f PM	256	NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, INT_MIN)
1da177e4 LT	257
	258	/* Call setsockopt() */
	259	int nf_setsockopt(struct sock sk, int pf, int optval, char __user opt,
	260	int len);
	261	int nf_getsockopt(struct sock sk, int pf, int optval, char __user opt,
	262	int *len);
	263
3fdadf7d DM	264	int compat_nf_setsockopt(struct sock *sk, int pf, int optval,
	265	char __user *opt, int len);
	266	int compat_nf_getsockopt(struct sock *sk, int pf, int optval,
	267	char __user opt, int len);
	268
1da177e4	269	/* Packet queuing */
bbd86b9f HW	270	struct nf_queue_handler {
	271	int (outfn)(struct sk_buff skb, struct nf_info *info,
	272	unsigned int queuenum, void *data);
	273	void *data;
	274	char *name;
	275	};
1da177e4	276	extern int nf_register_queue_handler(int pf,
bbd86b9f	277	struct nf_queue_handler *qh);
1da177e4	278	extern int nf_unregister_queue_handler(int pf);
bbd86b9f	279	extern void nf_unregister_queue_handlers(struct nf_queue_handler *qh);
1da177e4 LT	280	extern void nf_reinject(struct sk_buff *skb,
	281	struct nf_info *info,
	282	unsigned int verdict);
	283
1da177e4 LT	284	/* FIXME: Before cache is ever used, this must be implemented for real. */
	285	extern void nf_invalidate_cache(int pf);
	286
089af26c HW	287	/* Call this before modifying an existing packet: ensures it is
	288	modifiable and linear to the point you care about (writable_len).
	289	Returns true or false. */
	290	extern int skb_make_writable(struct sk_buff **pskb, unsigned int writable_len);
	291
43bc0ca7 AV	292	static inline void nf_csum_replace4(__sum16 *sum, __be32 from, __be32 to)
	293	{
	294	__be32 diff[] = { ~from, to };
	295
	296	sum = csum_fold(csum_partial((char )diff, sizeof(diff), ~csum_unfold(*sum)));
	297	}
	298
	299	static inline void nf_csum_replace2(__sum16 *sum, __be16 from, __be16 to)
	300	{
	301	nf_csum_replace4(sum, (__force __be32)from, (__force __be32)to);
	302	}
	303
	304	extern void nf_proto_csum_replace4(__sum16 sum, struct sk_buff skb,
	305	__be32 from, __be32 to, int pseudohdr);
	306
	307	static inline void nf_proto_csum_replace2(__sum16 sum, struct sk_buff skb,
	308	__be16 from, __be16 to, int pseudohdr)
	309	{
	310	nf_proto_csum_replace4(sum, skb, (__force __be32)from,
	311	(__force __be32)to, pseudohdr);
	312	}
4cf411de	313
bce8032e PM	314	struct nf_afinfo {
bce8032e PM	315	unsigned short family;
b51655b9	316	__sum16 (checksum)(struct sk_buff skb, unsigned int hook,
422c346f	317	unsigned int dataoff, u_int8_t protocol);
bce8032e PM	318	void (saveroute)(const struct sk_buff skb,
	319	struct nf_info *info);
	320	int (reroute)(struct sk_buff *skb,
	321	const struct nf_info *info);
	322	int route_key_size;
2cc7d573 HW	323	};
2cc7d573 HW	324
bce8032e PM	325	extern struct nf_afinfo *nf_afinfo[];
	326	static inline struct nf_afinfo *nf_get_afinfo(unsigned short family)
	327	{
	328	return rcu_dereference(nf_afinfo[family]);
	329	}
2cc7d573	330
b51655b9	331	static inline __sum16
422c346f PM	332	nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
	333	u_int8_t protocol, unsigned short family)
	334	{
	335	struct nf_afinfo *afinfo;
b51655b9	336	__sum16 csum = 0;
422c346f PM	337
	338	rcu_read_lock();
	339	afinfo = nf_get_afinfo(family);
	340	if (afinfo)
	341	csum = afinfo->checksum(skb, hook, dataoff, protocol);
	342	rcu_read_unlock();
	343	return csum;
	344	}
	345
bce8032e PM	346	extern int nf_register_afinfo(struct nf_afinfo *afinfo);
	347	extern void nf_unregister_afinfo(struct nf_afinfo *afinfo);
	348
	349	#define nf_info_reroute(x) ((void *)x + sizeof(struct nf_info))
2cc7d573	350
eb9c7ebe PM	351	#include <net/flow.h>
	352	extern void (ip_nat_decode_session)(struct sk_buff , struct flowi *);
	353
	354	static inline void
	355	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, int family)
	356	{
5b1158e9	357	#if defined(CONFIG_IP_NF_NAT_NEEDED) \|\| defined(CONFIG_NF_NAT_NEEDED)
eb9c7ebe PM	358	void (decodefn)(struct sk_buff , struct flowi *);
	359
	360	if (family == AF_INET && (decodefn = ip_nat_decode_session) != NULL)
	361	decodefn(skb, fl);
	362	#endif
	363	}
	364
608c8e4f HW	365	#ifdef CONFIG_PROC_FS
	366	#include <linux/proc_fs.h>
	367	extern struct proc_dir_entry *proc_net_netfilter;
	368	#endif
	369
1da177e4 LT	370	#else /* !CONFIG_NETFILTER */
1da177e4 LT	371	#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb)
48d5cad8	372	#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb)
f53b61d8 DM	373	static inline int nf_hook_thresh(int pf, unsigned int hook,
	374	struct sk_buff **pskb,
	375	struct net_device *indev,
	376	struct net_device *outdev,
48d5cad8 PM	377	int (okfn)(struct sk_buff ), int thresh,
48d5cad8 PM	378	int cond)
f53b61d8 DM	379	{
	380	return okfn(*pskb);
	381	}
	382	static inline int nf_hook(int pf, unsigned int hook, struct sk_buff **pskb,
	383	struct net_device indev, struct net_device outdev,
	384	int (okfn)(struct sk_buff ))
	385	{
9c92d348	386	return 1;
f53b61d8	387	}
f53b61d8	388	struct flowi;
eb9c7ebe PM	389	static inline void
eb9c7ebe PM	390	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, int family) {}
1da177e4 LT	391	#endif /CONFIG_NETFILTER/
1da177e4 LT	392
5f79e0f9 YK	393	#if defined(CONFIG_NF_CONNTRACK) \|\| defined(CONFIG_NF_CONNTRACK_MODULE)
	394	extern void (ip_ct_attach)(struct sk_buff , struct sk_buff *);
	395	extern void nf_ct_attach(struct sk_buff , struct sk_buff );
	396	#else
	397	static inline void nf_ct_attach(struct sk_buff new, struct sk_buff skb) {}
	398	#endif
	399
1da177e4 LT	400	#endif /__KERNEL__/
1da177e4 LT	401	#endif /__LINUX_NETFILTER_H/