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#ifndef _CACHE_H_
#define _CACHE_H_
#include <stdint.h>
#include <stddef.h>
#include "hash.h"
/* cache features */
enum {
NO_FEATURES = 0,
TIMER_FEATURE = 0,
TIMER = (1 << TIMER_FEATURE),
WRITE_THROUGH_FEATURE = 1,
WRITE_THROUGH = (1 << WRITE_THROUGH_FEATURE),
__CACHE_MAX_FEATURE
};
#define CACHE_MAX_FEATURE __CACHE_MAX_FEATURE
enum {
C_OBJ_NONE = 0, /* not in the cache */
C_OBJ_NEW, /* just added to the cache */
C_OBJ_ALIVE, /* in the cache, alive */
C_OBJ_DEAD /* still in the cache, but dead */
};
struct cache;
struct cache_object {
struct hashtable_node hashnode;
struct nf_conntrack *ct;
struct cache *cache;
int status;
int refcnt;
long lifetime;
long lastupdate;
char data[0];
};
struct cache_feature {
size_t size;
void (*add)(struct cache_object *obj, void *data);
void (*update)(struct cache_object *obj, void *data);
void (*destroy)(struct cache_object *obj, void *data);
int (*dump)(struct cache_object *obj, void *data, char *buf, int type);
};
extern struct cache_feature lifetime_feature;
extern struct cache_feature timer_feature;
extern struct cache_feature writethrough_feature;
#define CACHE_MAX_NAMELEN 32
struct cache {
char name[CACHE_MAX_NAMELEN];
struct hashtable *h;
unsigned int num_features;
struct cache_feature **features;
unsigned int feature_type[CACHE_MAX_FEATURE];
unsigned int *feature_offset;
struct cache_extra *extra;
unsigned int extra_offset;
size_t object_size;
/* statistics */
struct {
uint32_t active;
uint32_t add_ok;
uint32_t del_ok;
uint32_t upd_ok;
uint32_t add_fail;
uint32_t del_fail;
uint32_t upd_fail;
uint32_t add_fail_enomem;
uint32_t add_fail_enospc;
uint32_t del_fail_enoent;
uint32_t upd_fail_enoent;
uint32_t commit_ok;
uint32_t commit_fail;
uint32_t flush;
uint32_t objects;
} stats;
};
struct cache_extra {
unsigned int size;
void (*add)(struct cache_object *obj, void *data);
void (*update)(struct cache_object *obj, void *data);
void (*destroy)(struct cache_object *obj, void *data);
};
struct nf_conntrack;
struct cache *cache_create(const char *name, unsigned int features, struct cache_extra *extra);
void cache_destroy(struct cache *e);
struct cache_object *cache_object_new(struct cache *c, struct nf_conntrack *ct);
void cache_object_free(struct cache_object *obj);
void cache_object_get(struct cache_object *obj);
int cache_object_put(struct cache_object *obj);
void cache_object_set_status(struct cache_object *obj, int status);
int cache_add(struct cache *c, struct cache_object *obj, int id);
void cache_update(struct cache *c, struct cache_object *obj, int id, struct nf_conntrack *ct);
struct cache_object *cache_update_force(struct cache *c, struct nf_conntrack *ct);
void cache_del(struct cache *c, struct cache_object *obj);
struct cache_object *cache_find(struct cache *c, struct nf_conntrack *ct, int *pos);
void cache_stats(const struct cache *c, int fd);
void cache_stats_extended(const struct cache *c, int fd);
struct cache_object *cache_data_get_object(struct cache *c, void *data);
void *cache_get_extra(struct cache *, void *);
void cache_iterate(struct cache *c, void *data, int (*iterate)(void *data1, void *data2));
/* iterators */
void cache_dump(struct cache *c, int fd, int type);
void cache_commit(struct cache *c);
void cache_flush(struct cache *c);
void cache_bulk(struct cache *c);
#endif
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