[mirror_ubuntu-artful-kernel.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_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_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);

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