blob: 32d15bd6efa3c573030e899bb979d98dcc811ee9 [file] [log] [blame]
#include <linux/slab.h>
#include <net/netfilter/nf_conntrack.h>
enum nf_ct_ext_id {
#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)
/* 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)
/* 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);