[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_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

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