Release 4.11 security/selinux/ss/avtab.h

/*
 * 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>
 */

/* Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
 *
 *      Added conditional policy language extensions
 *
 * Copyright (C) 2003 Tresys Technology, LLC
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation, version 2.
 *
 * Updated: Yuichi Nakamura <ynakam@hitachisoft.jp>
 *      Tuned number of hash slots for avtab to reduce memory usage
 */
#ifndef _SS_AVTAB_H_

#define _SS_AVTAB_H_

#include "security.h"
#include <linux/flex_array.h>


struct avtab_key {
	
u16 source_type;	/* source type */
	
u16 target_type;	/* target type */
	
u16 target_class;	/* target object class */

#define AVTAB_ALLOWED		0x0001

#define AVTAB_AUDITALLOW	0x0002

#define AVTAB_AUDITDENY		0x0004

#define AVTAB_AV		(AVTAB_ALLOWED | AVTAB_AUDITALLOW | AVTAB_AUDITDENY)

#define AVTAB_TRANSITION	0x0010

#define AVTAB_MEMBER		0x0020

#define AVTAB_CHANGE		0x0040

#define AVTAB_TYPE		(AVTAB_TRANSITION | AVTAB_MEMBER | AVTAB_CHANGE)
/* extended permissions */

#define AVTAB_XPERMS_ALLOWED	0x0100

#define AVTAB_XPERMS_AUDITALLOW	0x0200

#define AVTAB_XPERMS_DONTAUDIT	0x0400

#define AVTAB_XPERMS		(AVTAB_XPERMS_ALLOWED | \
                                AVTAB_XPERMS_AUDITALLOW | \
                                AVTAB_XPERMS_DONTAUDIT)

#define AVTAB_ENABLED_OLD   0x80000000 /* reserved for used in cond_avtab */

#define AVTAB_ENABLED		0x8000 /* reserved for used in cond_avtab */
	
u16 specified;	/* what field is specified */
};

/*
 * For operations that require more than the 32 permissions provided by the avc
 * extended permissions may be used to provide 256 bits of permissions.
 */

struct avtab_extended_perms {
/* These are not flags. All 256 values may be used */

#define AVTAB_XPERMS_IOCTLFUNCTION	0x01

#define AVTAB_XPERMS_IOCTLDRIVER	0x02
	/* extension of the avtab_key specified */
	
u8 specified; /* ioctl, netfilter, ... */
	/*
         * if 256 bits is not adequate as is often the case with ioctls, then
         * multiple extended perms may be used and the driver field
         * specifies which permissions are included.
         */
	
u8 driver;
	/* 256 bits of permissions */
	
struct extended_perms_data perms;
};


struct avtab_datum {
	union {
		
u32 data; /* access vector or type value */
		
struct avtab_extended_perms *xperms;
	} 
u;
};


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


struct avtab {
	
struct flex_array *htable;
	
u32 nel;	/* number of elements */
	
u32 nslot;      /* number of hash slots */
	
u32 mask;       /* mask to compute hash func */

};

int avtab_init(struct avtab *);
int avtab_alloc(struct avtab *, u32);
struct avtab_datum *avtab_search(struct avtab *h, struct avtab_key *k);
void avtab_destroy(struct avtab *h);
void avtab_hash_eval(struct avtab *h, char *tag);

struct policydb;
int avtab_read_item(struct avtab *a, void *fp, struct policydb *pol,
		    int (*insert)(struct avtab *a, struct avtab_key *k,
				  struct avtab_datum *d, void *p),
		    void *p);

int avtab_read(struct avtab *a, void *fp, struct policydb *pol);
int avtab_write_item(struct policydb *p, struct avtab_node *cur, void *fp);
int avtab_write(struct policydb *p, struct avtab *a, void *fp);

struct avtab_node *avtab_insert_nonunique(struct avtab *h, struct avtab_key *key,
					  struct avtab_datum *datum);

struct avtab_node *avtab_search_node(struct avtab *h, struct avtab_key *key);

struct avtab_node *avtab_search_node_next(struct avtab_node *node, int specified);

void avtab_cache_init(void);
void avtab_cache_destroy(void);


#define MAX_AVTAB_HASH_BITS 16

#define MAX_AVTAB_HASH_BUCKETS (1 << MAX_AVTAB_HASH_BITS)

#endif	/* _SS_AVTAB_H_ */

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
220
52.76%
2
15.38%
Stephen D. Smalley
62
14.87%
4
30.77%
Jeff Vander Stoep
59
14.15%
1
7.69%
Eric Paris
43
10.31%
2
15.38%
Yuichi Nakamura
20
4.80%
1
7.69%
James Morris
6
1.44%
1
7.69%
Jeff Mahoney
6
1.44%
1
7.69%
John Brooks
1
0.24%
1
7.69%
Total
417
100.00%
13
100.00%
Directory: security/selinux/ss

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