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

#ifndef _NF_CONNTRACK_EXTEND_H
#define _NF_CONNTRACK_EXTEND_H

#include <linux/slab.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
5a0e3ad6 TH	4	#include <linux/slab.h>
5a0e3ad6 TH	5
ecfab2c9 YK	6	#include <net/netfilter/nf_conntrack.h>
ecfab2c9 YK	7
fd2c3ef7	8	enum nf_ct_ext_id {
ceceae1b	9	NF_CT_EXT_HELPER,
2d59e5ca	10	NF_CT_EXT_NAT,
58401572	11	NF_CT_EXT_ACCT,
a0891aa6	12	NF_CT_EXT_ECACHE,
5d0aa2cc	13	NF_CT_EXT_ZONE,
ecfab2c9 YK	14	NF_CT_EXT_NUM,
	15	};
	16
ceceae1b	17	#define NF_CT_EXT_HELPER_TYPE struct nf_conn_help
2d59e5ca	18	#define NF_CT_EXT_NAT_TYPE struct nf_conn_nat
58401572	19	#define NF_CT_EXT_ACCT_TYPE struct nf_conn_counter
a0891aa6	20	#define NF_CT_EXT_ECACHE_TYPE struct nf_conntrack_ecache
5d0aa2cc	21	#define NF_CT_EXT_ZONE_TYPE struct nf_conntrack_zone
ceceae1b	22
ecfab2c9 YK	23	/* Extensions: optional stuff which isn't permanently in struct. */
ecfab2c9 YK	24	struct nf_ct_ext {
68b80f11	25	struct rcu_head rcu;
ecfab2c9 YK	26	u8 offset[NF_CT_EXT_NUM];
ecfab2c9 YK	27	u8 len;
ecfab2c9 YK	28	char data[0];
	29	};
	30
	31	static inline int nf_ct_ext_exist(const struct nf_conn *ct, u8 id)
	32	{
	33	return (ct->ext && ct->ext->offset[id]);
	34	}
	35
	36	static inline void __nf_ct_ext_find(const struct nf_conn ct, u8 id)
	37	{
	38	if (!nf_ct_ext_exist(ct, id))
	39	return NULL;
	40
	41	return (void *)ct->ext + ct->ext->offset[id];
	42	}
	43	#define nf_ct_ext_find(ext, id) \
	44	((id##_TYPE *)__nf_ct_ext_find((ext), (id)))
	45
	46	/* Destroy all relationships */
	47	extern void __nf_ct_ext_destroy(struct nf_conn *ct);
	48	static inline void nf_ct_ext_destroy(struct nf_conn *ct)
	49	{
	50	if (ct->ext)
	51	__nf_ct_ext_destroy(ct);
	52	}
	53
	54	/* Free operation. If you want to free a object referred from private area,
	55	* please implement __nf_ct_ext_free() and call it.
	56	*/
	57	static inline void nf_ct_ext_free(struct nf_conn *ct)
	58	{
	59	if (ct->ext)
	60	kfree(ct->ext);
	61	}
	62
	63	/* Add this type, returns pointer to data or NULL. */
	64	void *
	65	__nf_ct_ext_add(struct nf_conn *ct, enum nf_ct_ext_id id, gfp_t gfp);
	66	#define nf_ct_ext_add(ct, id, gfp) \
	67	((id##_TYPE *)__nf_ct_ext_add((ct), (id), (gfp)))
	68
	69	#define NF_CT_EXT_F_PREALLOC 0x0001
	70
fd2c3ef7	71	struct nf_ct_ext_type {
ecfab2c9 YK	72	/* Destroys relationships (can be NULL). */
	73	void (destroy)(struct nf_conn ct);
	74	/* Called when realloacted (can be NULL).
	75	Contents has already been moved. */
86577c66	76	void (move)(void new, void *old);
ecfab2c9 YK	77
	78	enum nf_ct_ext_id id;
	79
	80	unsigned int flags;
	81
	82	/* Length and min alignment. */
	83	u8 len;
	84	u8 align;
	85	/* initial size of nf_ct_ext. */
	86	u8 alloc_size;
	87	};
	88
	89	int nf_ct_extend_register(struct nf_ct_ext_type *type);
	90	void nf_ct_extend_unregister(struct nf_ct_ext_type *type);
	91	#endif /* _NF_CONNTRACK_EXTEND_H */