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

/*
 * This header is used to share core functionality between the
 * standalone connection tracking module, and the compatibility layer's use
 * of connection tracking.
 *
 * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
 *	- generalize L3 protocol dependent part.
 *
 * Derived from include/linux/netfiter_ipv4/ip_conntrack_core.h
 */

#ifndef _NF_CONNTRACK_CORE_H
#define _NF_CONNTRACK_CORE_H

#include <linux/netfilter.h>
#include <net/netfilter/nf_conntrack_l3proto.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
#include <net/netfilter/nf_conntrack_ecache.h>

/* This header is used to share core functionality between the
   standalone connection tracking module, and the compatibility layer's use
   of connection tracking. */
unsigned int nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum,
			     struct sk_buff *skb);

int nf_conntrack_init_net(struct net *net);
void nf_conntrack_cleanup_net(struct net *net);
void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list);

int nf_conntrack_proto_pernet_init(struct net *net);
void nf_conntrack_proto_pernet_fini(struct net *net);

int nf_conntrack_proto_init(void);
void nf_conntrack_proto_fini(void);

int nf_conntrack_init_start(void);
void nf_conntrack_cleanup_start(void);

void nf_conntrack_init_end(void);
void nf_conntrack_cleanup_end(void);

bool nf_ct_get_tuple(const struct sk_buff *skb, unsigned int nhoff,
		     unsigned int dataoff, u_int16_t l3num, u_int8_t protonum,
		     struct nf_conntrack_tuple *tuple,
		     const struct nf_conntrack_l3proto *l3proto,
		     const struct nf_conntrack_l4proto *l4proto);

bool nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse,
			const struct nf_conntrack_tuple *orig,
			const struct nf_conntrack_l3proto *l3proto,
			const struct nf_conntrack_l4proto *l4proto);

/* Find a connection corresponding to a tuple. */
struct nf_conntrack_tuple_hash *
nf_conntrack_find_get(struct net *net,
		      const struct nf_conntrack_zone *zone,
		      const struct nf_conntrack_tuple *tuple);

int __nf_conntrack_confirm(struct sk_buff *skb);

/* Confirm a connection: returns NF_DROP if packet must be dropped. */
static inline int nf_conntrack_confirm(struct sk_buff *skb)
{
	struct nf_conn *ct = (struct nf_conn *)skb->nfct;
	int ret = NF_ACCEPT;

	if (ct && !nf_ct_is_untracked(ct)) {
		if (!nf_ct_is_confirmed(ct))
			ret = __nf_conntrack_confirm(skb);
		if (likely(ret == NF_ACCEPT))
			nf_ct_deliver_cached_events(ct);
	}
	return ret;
}

void
print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
            const struct nf_conntrack_l3proto *l3proto,
            const struct nf_conntrack_l4proto *proto);

#ifdef CONFIG_LOCKDEP
# define CONNTRACK_LOCKS 8
#else
# define CONNTRACK_LOCKS 1024
#endif
extern spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS];

extern spinlock_t nf_conntrack_expect_lock;

#endif /* _NF_CONNTRACK_CORE_H */
Commit	Line	Data
	1	/*
	2	* This header is used to share core functionality between the
	3	* standalone connection tracking module, and the compatibility layer's use
	4	* of connection tracking.
	5	*
	6	* 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
	7	* - generalize L3 protocol dependent part.
	8	*
	9	* Derived from include/linux/netfiter_ipv4/ip_conntrack_core.h
	10	*/
	11
	12	#ifndef _NF_CONNTRACK_CORE_H
	13	#define _NF_CONNTRACK_CORE_H
	14
	15	#include <linux/netfilter.h>
	16	#include <net/netfilter/nf_conntrack_l3proto.h>
	17	#include <net/netfilter/nf_conntrack_l4proto.h>
	18	#include <net/netfilter/nf_conntrack_ecache.h>
	19
	20	/* This header is used to share core functionality between the
	21	standalone connection tracking module, and the compatibility layer's use
	22	of connection tracking. */
	23	unsigned int nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum,
	24	struct sk_buff *skb);
	25
	26	int nf_conntrack_init_net(struct net *net);
	27	void nf_conntrack_cleanup_net(struct net *net);
	28	void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list);
	29
	30	int nf_conntrack_proto_pernet_init(struct net *net);
	31	void nf_conntrack_proto_pernet_fini(struct net *net);
	32
	33	int nf_conntrack_proto_init(void);
	34	void nf_conntrack_proto_fini(void);
	35
	36	int nf_conntrack_init_start(void);
	37	void nf_conntrack_cleanup_start(void);
	38
	39	void nf_conntrack_init_end(void);
	40	void nf_conntrack_cleanup_end(void);
	41
	42	bool nf_ct_get_tuple(const struct sk_buff *skb, unsigned int nhoff,
	43	unsigned int dataoff, u_int16_t l3num, u_int8_t protonum,
	44	struct nf_conntrack_tuple *tuple,
	45	const struct nf_conntrack_l3proto *l3proto,
	46	const struct nf_conntrack_l4proto *l4proto);
	47
	48	bool nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse,
	49	const struct nf_conntrack_tuple *orig,
	50	const struct nf_conntrack_l3proto *l3proto,
	51	const struct nf_conntrack_l4proto *l4proto);
	52
	53	/* Find a connection corresponding to a tuple. */
	54	struct nf_conntrack_tuple_hash *
	55	nf_conntrack_find_get(struct net *net,
	56	const struct nf_conntrack_zone *zone,
	57	const struct nf_conntrack_tuple *tuple);
	58
	59	int __nf_conntrack_confirm(struct sk_buff *skb);
	60
	61	/* Confirm a connection: returns NF_DROP if packet must be dropped. */
	62	static inline int nf_conntrack_confirm(struct sk_buff *skb)
	63	{
	64	struct nf_conn ct = (struct nf_conn )skb->nfct;
	65	int ret = NF_ACCEPT;
	66
	67	if (ct && !nf_ct_is_untracked(ct)) {
	68	if (!nf_ct_is_confirmed(ct))
	69	ret = __nf_conntrack_confirm(skb);
	70	if (likely(ret == NF_ACCEPT))
	71	nf_ct_deliver_cached_events(ct);
	72	}
	73	return ret;
	74	}
	75
	76	void
	77	print_tuple(struct seq_file s, const struct nf_conntrack_tuple tuple,
	78	const struct nf_conntrack_l3proto *l3proto,
	79	const struct nf_conntrack_l4proto *proto);
	80
	81	#ifdef CONFIG_LOCKDEP
	82	# define CONNTRACK_LOCKS 8
	83	#else
	84	# define CONNTRACK_LOCKS 1024
	85	#endif
	86	extern spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS];
	87
	88	extern spinlock_t nf_conntrack_expect_lock;
	89
	90	#endif /* _NF_CONNTRACK_CORE_H */