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Initial Import 2.6.0

/*
 * An access vector table (avtab) is a hash table
 * of access vectors and transition types indexed
 * by a type pair and a class.  An access vector
 * table is used to represent the type enforcement
 * tables.
 *
 *  Author : Stephen Smalley, <sds@epoch.ncsc.mil>
 */
#ifndef _SS_AVTAB_H_
#define _SS_AVTAB_H_

struct avtab_key {
	u32 source_type;	/* source type */
	u32 target_type;	/* target type */
	u32 target_class;	/* target object class */
};

struct avtab_datum {
#define AVTAB_ALLOWED     1
#define AVTAB_AUDITALLOW  2
#define AVTAB_AUDITDENY   4
#define AVTAB_AV         (AVTAB_ALLOWED | AVTAB_AUDITALLOW | AVTAB_AUDITDENY)
#define AVTAB_TRANSITION 16
#define AVTAB_MEMBER     32
#define AVTAB_CHANGE     64
#define AVTAB_TYPE       (AVTAB_TRANSITION | AVTAB_MEMBER | AVTAB_CHANGE)
	u32 specified;	/* what fields are specified */
	u32 data[3];	/* access vectors or types */
#define avtab_allowed(x) (x)->data[0]
#define avtab_auditdeny(x) (x)->data[1]
#define avtab_auditallow(x) (x)->data[2]
#define avtab_transition(x) (x)->data[0]
#define avtab_change(x) (x)->data[1]
#define avtab_member(x) (x)->data[2]
};

struct avtab_node {
	struct avtab_key key;
	struct avtab_datum datum;
	struct avtab_node *next;
};

struct avtab {
	struct avtab_node **htable;
	u32 nel;	/* number of elements */
};

int avtab_init(struct avtab *);
int avtab_insert(struct avtab *h, struct avtab_key *k, struct avtab_datum *d);
struct avtab_datum *avtab_search(struct avtab *h, struct avtab_key *k, int specified);
void avtab_destroy(struct avtab *h);
int avtab_map(struct avtab *h,
	      int (*apply) (struct avtab_key *k,
			    struct avtab_datum *d,
			    void *args),
	      void *args);
void avtab_hash_eval(struct avtab *h, char *tag);
int avtab_read(struct avtab *a, void *fp, u32 config);

#define AVTAB_HASH_BITS 15
#define AVTAB_HASH_BUCKETS (1 << AVTAB_HASH_BITS)
#define AVTAB_HASH_MASK (AVTAB_HASH_BUCKETS-1)

#define AVTAB_SIZE AVTAB_HASH_BUCKETS

#endif	/* _SS_AVTAB_H_ */