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118 lines
3.7 KiB
118 lines
3.7 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* An access vector table (avtab) is a hash table |
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* of access vectors and transition types indexed |
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* by a type pair and a class. An access vector |
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* table is used to represent the type enforcement |
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* tables. |
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* |
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* Author : Stephen Smalley, <[email protected]> |
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*/ |
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/* Updated: Frank Mayer <[email protected]> and Karl MacMillan <[email protected]> |
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* |
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* Added conditional policy language extensions |
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* |
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* Copyright (C) 2003 Tresys Technology, LLC |
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* |
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* Updated: Yuichi Nakamura <[email protected]> |
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* Tuned number of hash slots for avtab to reduce memory usage |
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*/ |
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#ifndef _SS_AVTAB_H_ |
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#define _SS_AVTAB_H_ |
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#include "security.h" |
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struct avtab_key { |
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u16 source_type; /* source type */ |
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u16 target_type; /* target type */ |
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u16 target_class; /* target object class */ |
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#define AVTAB_ALLOWED 0x0001 |
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#define AVTAB_AUDITALLOW 0x0002 |
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#define AVTAB_AUDITDENY 0x0004 |
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#define AVTAB_AV (AVTAB_ALLOWED | AVTAB_AUDITALLOW | AVTAB_AUDITDENY) |
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#define AVTAB_TRANSITION 0x0010 |
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#define AVTAB_MEMBER 0x0020 |
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#define AVTAB_CHANGE 0x0040 |
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#define AVTAB_TYPE (AVTAB_TRANSITION | AVTAB_MEMBER | AVTAB_CHANGE) |
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/* extended permissions */ |
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#define AVTAB_XPERMS_ALLOWED 0x0100 |
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#define AVTAB_XPERMS_AUDITALLOW 0x0200 |
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#define AVTAB_XPERMS_DONTAUDIT 0x0400 |
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#define AVTAB_XPERMS (AVTAB_XPERMS_ALLOWED | \ |
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AVTAB_XPERMS_AUDITALLOW | \ |
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AVTAB_XPERMS_DONTAUDIT) |
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#define AVTAB_ENABLED_OLD 0x80000000 /* reserved for used in cond_avtab */ |
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#define AVTAB_ENABLED 0x8000 /* reserved for used in cond_avtab */ |
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u16 specified; /* what field is specified */ |
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}; |
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/* |
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* For operations that require more than the 32 permissions provided by the avc |
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* extended permissions may be used to provide 256 bits of permissions. |
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*/ |
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struct avtab_extended_perms { |
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/* These are not flags. All 256 values may be used */ |
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#define AVTAB_XPERMS_IOCTLFUNCTION 0x01 |
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#define AVTAB_XPERMS_IOCTLDRIVER 0x02 |
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/* extension of the avtab_key specified */ |
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u8 specified; /* ioctl, netfilter, ... */ |
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/* |
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* if 256 bits is not adequate as is often the case with ioctls, then |
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* multiple extended perms may be used and the driver field |
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* specifies which permissions are included. |
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*/ |
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u8 driver; |
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/* 256 bits of permissions */ |
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struct extended_perms_data perms; |
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}; |
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struct avtab_datum { |
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union { |
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u32 data; /* access vector or type value */ |
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struct avtab_extended_perms *xperms; |
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} u; |
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}; |
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struct avtab_node { |
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struct avtab_key key; |
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struct avtab_datum datum; |
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struct avtab_node *next; |
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}; |
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struct avtab { |
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struct avtab_node **htable; |
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u32 nel; /* number of elements */ |
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u32 nslot; /* number of hash slots */ |
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u32 mask; /* mask to compute hash func */ |
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}; |
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void avtab_init(struct avtab *h); |
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int avtab_alloc(struct avtab *, u32); |
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int avtab_alloc_dup(struct avtab *new, const struct avtab *orig); |
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struct avtab_datum *avtab_search(struct avtab *h, struct avtab_key *k); |
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void avtab_destroy(struct avtab *h); |
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void avtab_hash_eval(struct avtab *h, char *tag); |
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struct policydb; |
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int avtab_read_item(struct avtab *a, void *fp, struct policydb *pol, |
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int (*insert)(struct avtab *a, struct avtab_key *k, |
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struct avtab_datum *d, void *p), |
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void *p); |
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int avtab_read(struct avtab *a, void *fp, struct policydb *pol); |
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int avtab_write_item(struct policydb *p, struct avtab_node *cur, void *fp); |
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int avtab_write(struct policydb *p, struct avtab *a, void *fp); |
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struct avtab_node *avtab_insert_nonunique(struct avtab *h, struct avtab_key *key, |
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struct avtab_datum *datum); |
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struct avtab_node *avtab_search_node(struct avtab *h, struct avtab_key *key); |
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struct avtab_node *avtab_search_node_next(struct avtab_node *node, int specified); |
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#define MAX_AVTAB_HASH_BITS 16 |
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#define MAX_AVTAB_HASH_BUCKETS (1 << MAX_AVTAB_HASH_BITS) |
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#endif /* _SS_AVTAB_H_ */ |
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