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- /*
- * 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_
- #include <net/netlabel.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 unsigned int ebitmap_start(struct ebitmap *e,
- struct ebitmap_node **n)
- {
- *n = e->node;
- return ebitmap_startbit(e);
- }
- static inline void ebitmap_init(struct ebitmap *e)
- {
- memset(e, 0, sizeof(*e));
- }
- static inline unsigned int ebitmap_next(struct ebitmap_node **n,
- unsigned int bit)
- {
- if ((bit == ((*n)->startbit + MAPSIZE - 1)) &&
- (*n)->next) {
- *n = (*n)->next;
- return (*n)->startbit;
- }
- return (bit+1);
- }
- static inline int ebitmap_node_get_bit(struct ebitmap_node * n,
- unsigned int bit)
- {
- if (n->map & (MAPBIT << (bit - n->startbit)))
- return 1;
- return 0;
- }
- #define ebitmap_for_each_bit(e, n, bit) \
- for (bit = ebitmap_start(e, &n); bit < ebitmap_length(e); bit = ebitmap_next(&n, bit)) \
- 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);
- #ifdef CONFIG_NETLABEL
- int ebitmap_netlbl_export(struct ebitmap *ebmap,
- struct netlbl_lsm_secattr_catmap **catmap);
- int ebitmap_netlbl_import(struct ebitmap *ebmap,
- struct netlbl_lsm_secattr_catmap *catmap);
- #else
- static inline int ebitmap_netlbl_export(struct ebitmap *ebmap,
- struct netlbl_lsm_secattr_catmap **catmap)
- {
- return -ENOMEM;
- }
- static inline int ebitmap_netlbl_import(struct ebitmap *ebmap,
- struct netlbl_lsm_secattr_catmap *catmap)
- {
- return -ENOMEM;
- }
- #endif
- #endif /* _SS_EBITMAP_H_ */
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