Edit File: avtab.h
/* Author : Stephen Smalley, <sds@tycho.nsa.gov> */ /* * Updated: Yuichi Nakamura <ynakam@hitachisoft.jp> * Tuned number of hash slots for avtab to reduce memory usage */ /* Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com> * * Added conditional policy language extensions * * Copyright (C) 2003 Tresys Technology, LLC * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ /* FLASK */ /* * 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. */ #ifndef _SEPOL_POLICYDB_AVTAB_H_ #define _SEPOL_POLICYDB_AVTAB_H_ #include <sys/types.h> #include <stdint.h> #ifdef __cplusplus extern "C" { #endif typedef struct avtab_key { uint16_t source_type; uint16_t target_type; uint16_t target_class; #define AVTAB_ALLOWED 0x0001 #define AVTAB_AUDITALLOW 0x0002 #define AVTAB_AUDITDENY 0x0004 #define AVTAB_NEVERALLOW 0x0080 #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) #define AVTAB_XPERMS_ALLOWED 0x0100 #define AVTAB_XPERMS_AUDITALLOW 0x0200 #define AVTAB_XPERMS_DONTAUDIT 0x0400 #define AVTAB_XPERMS_NEVERALLOW 0x0800 #define AVTAB_XPERMS (AVTAB_XPERMS_ALLOWED | AVTAB_XPERMS_AUDITALLOW | AVTAB_XPERMS_DONTAUDIT) #define AVTAB_ENABLED_OLD 0x80000000 #define AVTAB_ENABLED 0x8000 /* reserved for used in cond_avtab */ uint16_t specified; /* what fields are specified */ } avtab_key_t; typedef struct avtab_extended_perms { #define AVTAB_XPERMS_IOCTLFUNCTION 0x01 #define AVTAB_XPERMS_IOCTLDRIVER 0x02 /* extension of the avtab_key specified */ uint8_t specified; uint8_t driver; uint32_t perms[8]; } avtab_extended_perms_t; typedef struct avtab_datum { uint32_t data; /* access vector or type */ avtab_extended_perms_t *xperms; } avtab_datum_t; typedef struct avtab_node *avtab_ptr_t; struct avtab_node { avtab_key_t key; avtab_datum_t datum; avtab_ptr_t next; void *parse_context; /* generic context pointer used by parser; * not saved in binary policy */ unsigned merged; /* flag for avtab_write only; not saved in binary policy */ }; typedef struct avtab { avtab_ptr_t *htable; uint32_t nel; /* number of elements */ uint32_t nslot; /* number of hash slots */ uint32_t mask; /* mask to compute hash func */ } avtab_t; extern int avtab_init(avtab_t *); extern int avtab_alloc(avtab_t *, uint32_t); extern int avtab_insert(avtab_t * h, avtab_key_t * k, avtab_datum_t * d); extern avtab_datum_t *avtab_search(avtab_t * h, avtab_key_t * k); extern void avtab_destroy(avtab_t * h); extern int avtab_map(avtab_t * h, int (*apply) (avtab_key_t * k, avtab_datum_t * d, void *args), void *args); extern void avtab_hash_eval(avtab_t * h, char *tag); struct policy_file; extern int avtab_read_item(struct policy_file *fp, uint32_t vers, avtab_t * a, int (*insert) (avtab_t * a, avtab_key_t * k, avtab_datum_t * d, void *p), void *p); extern int avtab_read(avtab_t * a, struct policy_file *fp, uint32_t vers); extern avtab_ptr_t avtab_insert_nonunique(avtab_t * h, avtab_key_t * key, avtab_datum_t * datum); extern avtab_ptr_t avtab_insert_with_parse_context(avtab_t * h, avtab_key_t * key, avtab_datum_t * datum, void *parse_context); extern avtab_ptr_t avtab_search_node(avtab_t * h, avtab_key_t * key); extern avtab_ptr_t avtab_search_node_next(avtab_ptr_t node, int specified); #define MAX_AVTAB_HASH_BITS 20 #define MAX_AVTAB_HASH_BUCKETS (1 << MAX_AVTAB_HASH_BITS) #define MAX_AVTAB_HASH_MASK (MAX_AVTAB_HASH_BUCKETS-1) /* avtab_alloc uses one bucket per 2-4 elements, so adjust to get maximum buckets */ #define MAX_AVTAB_SIZE (MAX_AVTAB_HASH_BUCKETS << 1) #ifdef __cplusplus } #endif #endif /* _AVTAB_H_ */ /* FLASK */
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