diff options
Diffstat (limited to 'security/selinux/ss/ebitmap.h')
| -rw-r--r-- | security/selinux/ss/ebitmap.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/security/selinux/ss/ebitmap.h b/security/selinux/ss/ebitmap.h new file mode 100644 index 00000000000..471370233fd --- /dev/null +++ b/security/selinux/ss/ebitmap.h @@ -0,0 +1,48 @@ +/* + * An extensible bitmap is a bitmap that supports an + * arbitrary number of bits. Extensible bitmaps are + * used to represent sets of values, such as types, + * roles, categories, and classes. + * + * Each extensible bitmap is implemented as a linked + * list of bitmap nodes, where each bitmap node has + * an explicitly specified starting bit position within + * the total bitmap. + * + * Author : Stephen Smalley, <sds@epoch.ncsc.mil> + */ +#ifndef _SS_EBITMAP_H_ +#define _SS_EBITMAP_H_ + +#define MAPTYPE u64 /* portion of bitmap in each node */ +#define MAPSIZE (sizeof(MAPTYPE) * 8) /* number of bits in node bitmap */ +#define MAPBIT 1ULL /* a bit in the node bitmap */ + +struct ebitmap_node { + u32 startbit; /* starting position in the total bitmap */ + MAPTYPE map; /* this node's portion of the bitmap */ + struct ebitmap_node *next; +}; + +struct ebitmap { + struct ebitmap_node *node; /* first node in the bitmap */ + u32 highbit; /* highest position in the total bitmap */ +}; + +#define ebitmap_length(e) ((e)->highbit) +#define ebitmap_startbit(e) ((e)->node ? (e)->node->startbit : 0) + +static inline void ebitmap_init(struct ebitmap *e) +{ + memset(e, 0, sizeof(*e)); +} + +int ebitmap_cmp(struct ebitmap *e1, struct ebitmap *e2); +int ebitmap_cpy(struct ebitmap *dst, struct ebitmap *src); +int ebitmap_contains(struct ebitmap *e1, struct ebitmap *e2); +int ebitmap_get_bit(struct ebitmap *e, unsigned long bit); +int ebitmap_set_bit(struct ebitmap *e, unsigned long bit, int value); +void ebitmap_destroy(struct ebitmap *e); +int ebitmap_read(struct ebitmap *e, void *fp); + +#endif /* _SS_EBITMAP_H_ */ |