[GitHub/mt8127/android_kernel_alcatel_ttab.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,
#if defined(CONFIG_NF_NAT) || defined(CONFIG_NF_NAT_MODULE)
	NF_CT_EXT_NAT,
#endif
	NF_CT_EXT_ACCT,
#ifdef CONFIG_NF_CONNTRACK_EVENTS
	NF_CT_EXT_ECACHE,
#endif
#ifdef CONFIG_NF_CONNTRACK_ZONES
	NF_CT_EXT_ZONE,
#endif
#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
	NF_CT_EXT_TSTAMP,
#endif
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
	NF_CT_EXT_TIMEOUT,
#endif
	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
#define NF_CT_EXT_TSTAMP_TYPE struct nf_conn_tstamp
#define NF_CT_EXT_TIMEOUT_TYPE struct nf_conn_timeout

/* 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 bool __nf_ct_ext_exist(const struct nf_ct_ext *ext, u8 id)
{
	return !!ext->offset[id];
}

static inline bool nf_ct_ext_exist(const struct nf_conn *ct, u8 id)
{
	return (ct->ext && __nf_ct_ext_exist(ct->ext, 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_length(struct nf_conn *ct, enum nf_ct_ext_id id,
			     size_t var_alloc_len, gfp_t gfp);

#define nf_ct_ext_add(ct, id, gfp) \
	((id##_TYPE *)__nf_ct_ext_add_length((ct), (id), 0, (gfp)))
#define nf_ct_ext_add_length(ct, id, len, gfp) \
	((id##_TYPE *)__nf_ct_ext_add_length((ct), (id), (len), (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,
e0e76c83	10	#if defined(CONFIG_NF_NAT) \|\| defined(CONFIG_NF_NAT_MODULE)
2d59e5ca	11	NF_CT_EXT_NAT,
e0e76c83	12	#endif
58401572	13	NF_CT_EXT_ACCT,
e0e76c83	14	#ifdef CONFIG_NF_CONNTRACK_EVENTS
a0891aa6	15	NF_CT_EXT_ECACHE,
e0e76c83 CG	16	#endif
e0e76c83 CG	17	#ifdef CONFIG_NF_CONNTRACK_ZONES
5d0aa2cc	18	NF_CT_EXT_ZONE,
a992ca2a PNA	19	#endif
	20	#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
	21	NF_CT_EXT_TSTAMP,
dd705072 PNA	22	#endif
	23	#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
	24	NF_CT_EXT_TIMEOUT,
e0e76c83	25	#endif
ecfab2c9 YK	26	NF_CT_EXT_NUM,
	27	};
	28
ceceae1b	29	#define NF_CT_EXT_HELPER_TYPE struct nf_conn_help
2d59e5ca	30	#define NF_CT_EXT_NAT_TYPE struct nf_conn_nat
58401572	31	#define NF_CT_EXT_ACCT_TYPE struct nf_conn_counter
a0891aa6	32	#define NF_CT_EXT_ECACHE_TYPE struct nf_conntrack_ecache
5d0aa2cc	33	#define NF_CT_EXT_ZONE_TYPE struct nf_conntrack_zone
a992ca2a	34	#define NF_CT_EXT_TSTAMP_TYPE struct nf_conn_tstamp
dd705072	35	#define NF_CT_EXT_TIMEOUT_TYPE struct nf_conn_timeout
ceceae1b	36
ecfab2c9 YK	37	/* Extensions: optional stuff which isn't permanently in struct. */
ecfab2c9 YK	38	struct nf_ct_ext {
68b80f11	39	struct rcu_head rcu;
ecfab2c9 YK	40	u8 offset[NF_CT_EXT_NUM];
ecfab2c9 YK	41	u8 len;
ecfab2c9 YK	42	char data[0];
	43	};
	44
ee92d378	45	static inline bool __nf_ct_ext_exist(const struct nf_ct_ext *ext, u8 id)
ecfab2c9	46	{
ee92d378 CG	47	return !!ext->offset[id];
	48	}
	49
	50	static inline bool nf_ct_ext_exist(const struct nf_conn *ct, u8 id)
	51	{
	52	return (ct->ext && __nf_ct_ext_exist(ct->ext, id));
ecfab2c9 YK	53	}
	54
	55	static inline void __nf_ct_ext_find(const struct nf_conn ct, u8 id)
	56	{
	57	if (!nf_ct_ext_exist(ct, id))
	58	return NULL;
	59
	60	return (void *)ct->ext + ct->ext->offset[id];
	61	}
	62	#define nf_ct_ext_find(ext, id) \
	63	((id##_TYPE *)__nf_ct_ext_find((ext), (id)))
	64
	65	/* Destroy all relationships */
	66	extern void __nf_ct_ext_destroy(struct nf_conn *ct);
	67	static inline void nf_ct_ext_destroy(struct nf_conn *ct)
	68	{
	69	if (ct->ext)
	70	__nf_ct_ext_destroy(ct);
	71	}
	72
	73	/* Free operation. If you want to free a object referred from private area,
	74	* please implement __nf_ct_ext_free() and call it.
	75	*/
	76	static inline void nf_ct_ext_free(struct nf_conn *ct)
	77	{
	78	if (ct->ext)
	79	kfree(ct->ext);
	80	}
	81
	82	/* Add this type, returns pointer to data or NULL. */
3cf4c7e3 PNA	83	void __nf_ct_ext_add_length(struct nf_conn ct, enum nf_ct_ext_id id,
	84	size_t var_alloc_len, gfp_t gfp);
	85
ecfab2c9	86	#define nf_ct_ext_add(ct, id, gfp) \
3cf4c7e3 PNA	87	((id##_TYPE *)__nf_ct_ext_add_length((ct), (id), 0, (gfp)))
	88	#define nf_ct_ext_add_length(ct, id, len, gfp) \
	89	((id##_TYPE *)__nf_ct_ext_add_length((ct), (id), (len), (gfp)))
ecfab2c9 YK	90
	91	#define NF_CT_EXT_F_PREALLOC 0x0001
	92
fd2c3ef7	93	struct nf_ct_ext_type {
ecfab2c9 YK	94	/* Destroys relationships (can be NULL). */
	95	void (destroy)(struct nf_conn ct);
	96	/* Called when realloacted (can be NULL).
	97	Contents has already been moved. */
86577c66	98	void (move)(void new, void *old);
ecfab2c9 YK	99
	100	enum nf_ct_ext_id id;
	101
	102	unsigned int flags;
	103
	104	/* Length and min alignment. */
	105	u8 len;
	106	u8 align;
	107	/* initial size of nf_ct_ext. */
	108	u8 alloc_size;
	109	};
	110
	111	int nf_ct_extend_register(struct nf_ct_ext_type *type);
	112	void nf_ct_extend_unregister(struct nf_ct_ext_type *type);
	113	#endif /* _NF_CONNTRACK_EXTEND_H */