/* * 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, */ /* Updated: Frank Mayer and Karl MacMillan * * 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 * Tuned number of hash slots for avtab to reduce memory usage */ #ifndef _SS_AVTAB_H_ #define _SS_AVTAB_H_ #include "security.h" #include 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_ */ option>space:mode:

Diffstat (limited to 'net/kcm')