[net-next-2.6.git] / include / net / netfilter / nf_conntrack_extend.h

#ifndef _NF_CONNTRACK_EXTEND_H
#define _NF_CONNTRACK_EXTEND_H

#include <net/netfilter/nf_conntrack.h>

enum nf_ct_ext_id {
	NF_CT_EXT_HELPER,
	NF_CT_EXT_NAT,
	NF_CT_EXT_ACCT,
	NF_CT_EXT_ECACHE,
	NF_CT_EXT_ZONE,
	NF_CT_EXT_NUM,
};

#define NF_CT_EXT_HELPER_TYPE struct nf_conn_help
#define NF_CT_EXT_NAT_TYPE struct nf_conn_nat
#define NF_CT_EXT_ACCT_TYPE struct nf_conn_counter
#define NF_CT_EXT_ECACHE_TYPE struct nf_conntrack_ecache
#define NF_CT_EXT_ZONE_TYPE struct nf_conntrack_zone

/* Extensions: optional stuff which isn't permanently in struct. */
struct nf_ct_ext {
	struct rcu_head rcu;
	u8 offset[NF_CT_EXT_NUM];
	u8 len;
	char data[0];
};

static inline int nf_ct_ext_exist(const struct nf_conn *ct, u8 id)
{
	return (ct->ext && ct->ext->offset[id]);
}

static inline void *__nf_ct_ext_find(const struct nf_conn *ct, u8 id)
{
	if (!nf_ct_ext_exist(ct, id))
		return NULL;

	return (void *)ct->ext + ct->ext->offset[id];
}
#define nf_ct_ext_find(ext, id)	\
	((id##_TYPE *)__nf_ct_ext_find((ext), (id)))

/* Destroy all relationships */
extern void __nf_ct_ext_destroy(struct nf_conn *ct);
static inline void nf_ct_ext_destroy(struct nf_conn *ct)
{
	if (ct->ext)
		__nf_ct_ext_destroy(ct);
}

/* Free operation. If you want to free a object referred from private area,
 * please implement __nf_ct_ext_free() and call it.
 */
static inline void nf_ct_ext_free(struct nf_conn *ct)
{
	if (ct->ext)
		kfree(ct->ext);
}

/* Add this type, returns pointer to data or NULL. */
void *
__nf_ct_ext_add(struct nf_conn *ct, enum nf_ct_ext_id id, gfp_t gfp);
#define nf_ct_ext_add(ct, id, gfp) \
	((id##_TYPE *)__nf_ct_ext_add((ct), (id), (gfp)))

#define NF_CT_EXT_F_PREALLOC	0x0001

struct nf_ct_ext_type {
	/* Destroys relationships (can be NULL). */
	void (*destroy)(struct nf_conn *ct);
	/* Called when realloacted (can be NULL).
	   Contents has already been moved. */
	void (*move)(void *new, void *old);

	enum nf_ct_ext_id id;

	unsigned int flags;

	/* Length and min alignment. */
	u8 len;
	u8 align;
	/* initial size of nf_ct_ext. */
	u8 alloc_size;
};

int nf_ct_extend_register(struct nf_ct_ext_type *type);
void nf_ct_extend_unregister(struct nf_ct_ext_type *type);
#endif /* _NF_CONNTRACK_EXTEND_H */
Commit	Line	Data
ecfab2c9 YK	1	#ifndef _NF_CONNTRACK_EXTEND_H
	2	#define _NF_CONNTRACK_EXTEND_H
	3
	4	#include <net/netfilter/nf_conntrack.h>
	5
fd2c3ef7	6	enum nf_ct_ext_id {
ceceae1b	7	NF_CT_EXT_HELPER,
2d59e5ca	8	NF_CT_EXT_NAT,
58401572	9	NF_CT_EXT_ACCT,
a0891aa6	10	NF_CT_EXT_ECACHE,
5d0aa2cc	11	NF_CT_EXT_ZONE,
ecfab2c9 YK	12	NF_CT_EXT_NUM,
	13	};
	14
ceceae1b	15	#define NF_CT_EXT_HELPER_TYPE struct nf_conn_help
2d59e5ca	16	#define NF_CT_EXT_NAT_TYPE struct nf_conn_nat
58401572	17	#define NF_CT_EXT_ACCT_TYPE struct nf_conn_counter
a0891aa6	18	#define NF_CT_EXT_ECACHE_TYPE struct nf_conntrack_ecache
5d0aa2cc	19	#define NF_CT_EXT_ZONE_TYPE struct nf_conntrack_zone
ceceae1b	20
ecfab2c9 YK	21	/* Extensions: optional stuff which isn't permanently in struct. */
ecfab2c9 YK	22	struct nf_ct_ext {
68b80f11	23	struct rcu_head rcu;
ecfab2c9 YK	24	u8 offset[NF_CT_EXT_NUM];
ecfab2c9 YK	25	u8 len;
ecfab2c9 YK	26	char data[0];
	27	};
	28
	29	static inline int nf_ct_ext_exist(const struct nf_conn *ct, u8 id)
	30	{
	31	return (ct->ext && ct->ext->offset[id]);
	32	}
	33
	34	static inline void __nf_ct_ext_find(const struct nf_conn ct, u8 id)
	35	{
	36	if (!nf_ct_ext_exist(ct, id))
	37	return NULL;
	38
	39	return (void *)ct->ext + ct->ext->offset[id];
	40	}
	41	#define nf_ct_ext_find(ext, id) \
	42	((id##_TYPE *)__nf_ct_ext_find((ext), (id)))
	43
	44	/* Destroy all relationships */
	45	extern void __nf_ct_ext_destroy(struct nf_conn *ct);
	46	static inline void nf_ct_ext_destroy(struct nf_conn *ct)
	47	{
	48	if (ct->ext)
	49	__nf_ct_ext_destroy(ct);
	50	}
	51
	52	/* Free operation. If you want to free a object referred from private area,
	53	* please implement __nf_ct_ext_free() and call it.
	54	*/
	55	static inline void nf_ct_ext_free(struct nf_conn *ct)
	56	{
	57	if (ct->ext)
	58	kfree(ct->ext);
	59	}
	60
	61	/* Add this type, returns pointer to data or NULL. */
	62	void *
	63	__nf_ct_ext_add(struct nf_conn *ct, enum nf_ct_ext_id id, gfp_t gfp);
	64	#define nf_ct_ext_add(ct, id, gfp) \
	65	((id##_TYPE *)__nf_ct_ext_add((ct), (id), (gfp)))
	66
	67	#define NF_CT_EXT_F_PREALLOC 0x0001
	68
fd2c3ef7	69	struct nf_ct_ext_type {
ecfab2c9 YK	70	/* Destroys relationships (can be NULL). */
	71	void (destroy)(struct nf_conn ct);
	72	/* Called when realloacted (can be NULL).
	73	Contents has already been moved. */
86577c66	74	void (move)(void new, void *old);
ecfab2c9 YK	75
	76	enum nf_ct_ext_id id;
	77
	78	unsigned int flags;
	79
	80	/* Length and min alignment. */
	81	u8 len;
	82	u8 align;
	83	/* initial size of nf_ct_ext. */
	84	u8 alloc_size;
	85	};
	86
	87	int nf_ct_extend_register(struct nf_ct_ext_type *type);
	88	void nf_ct_extend_unregister(struct nf_ct_ext_type *type);
	89	#endif /* _NF_CONNTRACK_EXTEND_H */