[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,
#if defined(CONFIG_NF_NAT) || defined(CONFIG_NF_NAT_MODULE)
	NF_CT_EXT_NAT,
#endif
	NF_CT_EXT_SEQADJ,
	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
#ifdef CONFIG_NF_CONNTRACK_LABELS
	NF_CT_EXT_LABELS,
#endif
#if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY)
	NF_CT_EXT_SYNPROXY,
#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_SEQADJ_TYPE struct nf_conn_seqadj
#define NF_CT_EXT_ACCT_TYPE struct nf_conn_acct
#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
#define NF_CT_EXT_LABELS_TYPE struct nf_conn_labels
#define NF_CT_EXT_SYNPROXY_TYPE struct nf_conn_synproxy

/* Extensions: optional stuff which isn't permanently in struct. */
struct nf_ct_ext {
	struct rcu_head rcu;
	u16 offset[NF_CT_EXT_NUM];
	u16 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 */
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_rcu(ct->ext, rcu);
}

/* 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
48b1de4c	13	NF_CT_EXT_SEQADJ,
58401572	14	NF_CT_EXT_ACCT,
e0e76c83	15	#ifdef CONFIG_NF_CONNTRACK_EVENTS
a0891aa6	16	NF_CT_EXT_ECACHE,
e0e76c83 CG	17	#endif
e0e76c83 CG	18	#ifdef CONFIG_NF_CONNTRACK_ZONES
5d0aa2cc	19	NF_CT_EXT_ZONE,
a992ca2a PNA	20	#endif
	21	#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
	22	NF_CT_EXT_TSTAMP,
dd705072 PNA	23	#endif
	24	#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
	25	NF_CT_EXT_TIMEOUT,
c539f017 FW	26	#endif
	27	#ifdef CONFIG_NF_CONNTRACK_LABELS
	28	NF_CT_EXT_LABELS,
48b1de4c PM	29	#endif
	30	#if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY)
	31	NF_CT_EXT_SYNPROXY,
e0e76c83	32	#endif
ecfab2c9 YK	33	NF_CT_EXT_NUM,
	34	};
	35
ceceae1b	36	#define NF_CT_EXT_HELPER_TYPE struct nf_conn_help
2d59e5ca	37	#define NF_CT_EXT_NAT_TYPE struct nf_conn_nat
41d73ec0	38	#define NF_CT_EXT_SEQADJ_TYPE struct nf_conn_seqadj
f7b13e43	39	#define NF_CT_EXT_ACCT_TYPE struct nf_conn_acct
a0891aa6	40	#define NF_CT_EXT_ECACHE_TYPE struct nf_conntrack_ecache
5d0aa2cc	41	#define NF_CT_EXT_ZONE_TYPE struct nf_conntrack_zone
a992ca2a	42	#define NF_CT_EXT_TSTAMP_TYPE struct nf_conn_tstamp
dd705072	43	#define NF_CT_EXT_TIMEOUT_TYPE struct nf_conn_timeout
c539f017	44	#define NF_CT_EXT_LABELS_TYPE struct nf_conn_labels
48b1de4c	45	#define NF_CT_EXT_SYNPROXY_TYPE struct nf_conn_synproxy
ceceae1b	46
ecfab2c9 YK	47	/* Extensions: optional stuff which isn't permanently in struct. */
ecfab2c9 YK	48	struct nf_ct_ext {
68b80f11	49	struct rcu_head rcu;
223b02d9 AV	50	u16 offset[NF_CT_EXT_NUM];
223b02d9 AV	51	u16 len;
ecfab2c9 YK	52	char data[0];
	53	};
	54
ee92d378	55	static inline bool __nf_ct_ext_exist(const struct nf_ct_ext *ext, u8 id)
ecfab2c9	56	{
ee92d378 CG	57	return !!ext->offset[id];
	58	}
	59
	60	static inline bool nf_ct_ext_exist(const struct nf_conn *ct, u8 id)
	61	{
	62	return (ct->ext && __nf_ct_ext_exist(ct->ext, id));
ecfab2c9 YK	63	}
	64
	65	static inline void __nf_ct_ext_find(const struct nf_conn ct, u8 id)
	66	{
	67	if (!nf_ct_ext_exist(ct, id))
	68	return NULL;
	69
	70	return (void *)ct->ext + ct->ext->offset[id];
	71	}
	72	#define nf_ct_ext_find(ext, id) \
	73	((id##_TYPE *)__nf_ct_ext_find((ext), (id)))
	74
	75	/* Destroy all relationships */
4e77be46	76	void __nf_ct_ext_destroy(struct nf_conn *ct);
ecfab2c9 YK	77	static inline void nf_ct_ext_destroy(struct nf_conn *ct)
	78	{
	79	if (ct->ext)
	80	__nf_ct_ext_destroy(ct);
	81	}
	82
	83	/* Free operation. If you want to free a object referred from private area,
	84	* please implement __nf_ct_ext_free() and call it.
	85	*/
	86	static inline void nf_ct_ext_free(struct nf_conn *ct)
	87	{
	88	if (ct->ext)
c13a84a8	89	kfree_rcu(ct->ext, rcu);
ecfab2c9 YK	90	}
	91
	92	/* Add this type, returns pointer to data or NULL. */
3cf4c7e3 PNA	93	void __nf_ct_ext_add_length(struct nf_conn ct, enum nf_ct_ext_id id,
	94	size_t var_alloc_len, gfp_t gfp);
	95
ecfab2c9	96	#define nf_ct_ext_add(ct, id, gfp) \
3cf4c7e3 PNA	97	((id##_TYPE *)__nf_ct_ext_add_length((ct), (id), 0, (gfp)))
	98	#define nf_ct_ext_add_length(ct, id, len, gfp) \
	99	((id##_TYPE *)__nf_ct_ext_add_length((ct), (id), (len), (gfp)))
ecfab2c9 YK	100
	101	#define NF_CT_EXT_F_PREALLOC 0x0001
	102
fd2c3ef7	103	struct nf_ct_ext_type {
ecfab2c9 YK	104	/* Destroys relationships (can be NULL). */
	105	void (destroy)(struct nf_conn ct);
	106	/* Called when realloacted (can be NULL).
	107	Contents has already been moved. */
86577c66	108	void (move)(void new, void *old);
ecfab2c9 YK	109
	110	enum nf_ct_ext_id id;
	111
	112	unsigned int flags;
	113
	114	/* Length and min alignment. */
	115	u8 len;
	116	u8 align;
	117	/* initial size of nf_ct_ext. */
	118	u8 alloc_size;
	119	};
	120
	121	int nf_ct_extend_register(struct nf_ct_ext_type *type);
	122	void nf_ct_extend_unregister(struct nf_ct_ext_type *type);
	123	#endif /* _NF_CONNTRACK_EXTEND_H */