[linux-2.6-block.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, u16 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
9fb9cbb1 YK	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>
77ab9cff	16	#include <net/netfilter/nf_conntrack_l3proto.h>
605dcad6	17	#include <net/netfilter/nf_conntrack_l4proto.h>
f6180121	18	#include <net/netfilter/nf_conntrack_ecache.h>
9fb9cbb1 YK	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. */
4e77be46 JP	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);
9fb9cbb1 YK	52
9fb9cbb1 YK	53	/* Find a connection corresponding to a tuple. */
4e77be46	54	struct nf_conntrack_tuple_hash *
5d0aa2cc PM	55	nf_conntrack_find_get(struct net *net, u16 zone,
5d0aa2cc PM	56	const struct nf_conntrack_tuple *tuple);
9fb9cbb1	57
4e77be46	58	int __nf_conntrack_confirm(struct sk_buff *skb);
9fb9cbb1 YK	59
9fb9cbb1 YK	60	/* Confirm a connection: returns NF_DROP if packet must be dropped. */
3db05fea	61	static inline int nf_conntrack_confirm(struct sk_buff *skb)
9fb9cbb1	62	{
3db05fea	63	struct nf_conn ct = (struct nf_conn )skb->nfct;
9fb9cbb1 YK	64	int ret = NF_ACCEPT;
9fb9cbb1 YK	65
5bfddbd4	66	if (ct && !nf_ct_is_untracked(ct)) {
fc350777	67	if (!nf_ct_is_confirmed(ct))
3db05fea	68	ret = __nf_conntrack_confirm(skb);
b1e93a68 PNA	69	if (likely(ret == NF_ACCEPT))
b1e93a68 PNA	70	nf_ct_deliver_cached_events(ct);
9fb9cbb1 YK	71	}
	72	return ret;
	73	}
	74
824f1fbe	75	void
77ab9cff	76	print_tuple(struct seq_file s, const struct nf_conntrack_tuple tuple,
32948588 JE	77	const struct nf_conntrack_l3proto *l3proto,
32948588 JE	78	const struct nf_conntrack_l4proto *proto);
77ab9cff	79
93bb0ceb JDB	80	#ifdef CONFIG_LOCKDEP
	81	# define CONNTRACK_LOCKS 8
	82	#else
	83	# define CONNTRACK_LOCKS 1024
	84	#endif
	85	extern spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS];
7e5d03bb	86
ca7433df JDB	87	extern spinlock_t nf_conntrack_expect_lock;
ca7433df JDB	88
9fb9cbb1	89	#endif /* _NF_CONNTRACK_CORE_H */