LCOV - code coverage report
Current view: top level - security/selinux/ss - ebitmap.h (source / functions) Hit Total Coverage
Test: combined.info Lines: 0 18 0.0 %
Date: 2022-04-01 14:35:51 Functions: 0 0 -
Branches: 0 12 0.0 %

           Branch data     Line data    Source code
       1                 :            : /* SPDX-License-Identifier: GPL-2.0 */
       2                 :            : /*
       3                 :            :  * An extensible bitmap is a bitmap that supports an
       4                 :            :  * arbitrary number of bits.  Extensible bitmaps are
       5                 :            :  * used to represent sets of values, such as types,
       6                 :            :  * roles, categories, and classes.
       7                 :            :  *
       8                 :            :  * Each extensible bitmap is implemented as a linked
       9                 :            :  * list of bitmap nodes, where each bitmap node has
      10                 :            :  * an explicitly specified starting bit position within
      11                 :            :  * the total bitmap.
      12                 :            :  *
      13                 :            :  * Author : Stephen Smalley, <sds@tycho.nsa.gov>
      14                 :            :  */
      15                 :            : #ifndef _SS_EBITMAP_H_
      16                 :            : #define _SS_EBITMAP_H_
      17                 :            : 
      18                 :            : #include <net/netlabel.h>
      19                 :            : 
      20                 :            : #ifdef CONFIG_64BIT
      21                 :            : #define EBITMAP_NODE_SIZE       64
      22                 :            : #else
      23                 :            : #define EBITMAP_NODE_SIZE       32
      24                 :            : #endif
      25                 :            : 
      26                 :            : #define EBITMAP_UNIT_NUMS       ((EBITMAP_NODE_SIZE-sizeof(void *)-sizeof(u32))\
      27                 :            :                                         / sizeof(unsigned long))
      28                 :            : #define EBITMAP_UNIT_SIZE       BITS_PER_LONG
      29                 :            : #define EBITMAP_SIZE            (EBITMAP_UNIT_NUMS * EBITMAP_UNIT_SIZE)
      30                 :            : #define EBITMAP_BIT             1ULL
      31                 :            : #define EBITMAP_SHIFT_UNIT_SIZE(x)                                      \
      32                 :            :         (((x) >> EBITMAP_UNIT_SIZE / 2) >> EBITMAP_UNIT_SIZE / 2)
      33                 :            : 
      34                 :            : struct ebitmap_node {
      35                 :            :         struct ebitmap_node *next;
      36                 :            :         unsigned long maps[EBITMAP_UNIT_NUMS];
      37                 :            :         u32 startbit;
      38                 :            : };
      39                 :            : 
      40                 :            : struct ebitmap {
      41                 :            :         struct ebitmap_node *node;      /* first node in the bitmap */
      42                 :            :         u32 highbit;    /* highest position in the total bitmap */
      43                 :            : };
      44                 :            : 
      45                 :            : #define ebitmap_length(e) ((e)->highbit)
      46                 :            : 
      47                 :            : static inline unsigned int ebitmap_start_positive(struct ebitmap *e,
      48                 :            :                                                   struct ebitmap_node **n)
      49                 :            : {
      50                 :            :         unsigned int ofs;
      51                 :            : 
      52                 :            :         for (*n = e->node; *n; *n = (*n)->next) {
      53                 :            :                 ofs = find_first_bit((*n)->maps, EBITMAP_SIZE);
      54                 :            :                 if (ofs < EBITMAP_SIZE)
      55                 :            :                         return (*n)->startbit + ofs;
      56                 :            :         }
      57                 :            :         return ebitmap_length(e);
      58                 :            : }
      59                 :            : 
      60                 :          0 : static inline void ebitmap_init(struct ebitmap *e)
      61                 :            : {
      62         [ #  # ]:          0 :         memset(e, 0, sizeof(*e));
      63                 :            : }
      64                 :            : 
      65                 :            : static inline unsigned int ebitmap_next_positive(struct ebitmap *e,
      66                 :            :                                                  struct ebitmap_node **n,
      67                 :            :                                                  unsigned int bit)
      68                 :            : {
      69                 :            :         unsigned int ofs;
      70                 :            : 
      71                 :            :         ofs = find_next_bit((*n)->maps, EBITMAP_SIZE, bit - (*n)->startbit + 1);
      72                 :            :         if (ofs < EBITMAP_SIZE)
      73                 :            :                 return ofs + (*n)->startbit;
      74                 :            : 
      75                 :            :         for (*n = (*n)->next; *n; *n = (*n)->next) {
      76                 :            :                 ofs = find_first_bit((*n)->maps, EBITMAP_SIZE);
      77                 :            :                 if (ofs < EBITMAP_SIZE)
      78                 :            :                         return ofs + (*n)->startbit;
      79                 :            :         }
      80                 :            :         return ebitmap_length(e);
      81                 :            : }
      82                 :            : 
      83                 :            : #define EBITMAP_NODE_INDEX(node, bit)   \
      84                 :            :         (((bit) - (node)->startbit) / EBITMAP_UNIT_SIZE)
      85                 :            : #define EBITMAP_NODE_OFFSET(node, bit)  \
      86                 :            :         (((bit) - (node)->startbit) % EBITMAP_UNIT_SIZE)
      87                 :            : 
      88                 :          0 : static inline int ebitmap_node_get_bit(struct ebitmap_node *n,
      89                 :            :                                        unsigned int bit)
      90                 :            : {
      91                 :          0 :         unsigned int index = EBITMAP_NODE_INDEX(n, bit);
      92                 :          0 :         unsigned int ofs = EBITMAP_NODE_OFFSET(n, bit);
      93                 :            : 
      94         [ #  # ]:          0 :         BUG_ON(index >= EBITMAP_UNIT_NUMS);
      95                 :          0 :         if ((n->maps[index] & (EBITMAP_BIT << ofs)))
      96                 :            :                 return 1;
      97                 :            :         return 0;
      98                 :            : }
      99                 :            : 
     100                 :          0 : static inline void ebitmap_node_set_bit(struct ebitmap_node *n,
     101                 :            :                                         unsigned int bit)
     102                 :            : {
     103                 :          0 :         unsigned int index = EBITMAP_NODE_INDEX(n, bit);
     104                 :          0 :         unsigned int ofs = EBITMAP_NODE_OFFSET(n, bit);
     105                 :            : 
     106   [ #  #  #  # ]:          0 :         BUG_ON(index >= EBITMAP_UNIT_NUMS);
     107         [ #  # ]:          0 :         n->maps[index] |= (EBITMAP_BIT << ofs);
     108                 :          0 : }
     109                 :            : 
     110                 :          0 : static inline void ebitmap_node_clr_bit(struct ebitmap_node *n,
     111                 :            :                                         unsigned int bit)
     112                 :            : {
     113                 :          0 :         unsigned int index = EBITMAP_NODE_INDEX(n, bit);
     114                 :          0 :         unsigned int ofs = EBITMAP_NODE_OFFSET(n, bit);
     115                 :            : 
     116         [ #  # ]:          0 :         BUG_ON(index >= EBITMAP_UNIT_NUMS);
     117                 :          0 :         n->maps[index] &= ~(EBITMAP_BIT << ofs);
     118                 :            : }
     119                 :            : 
     120                 :            : #define ebitmap_for_each_positive_bit(e, n, bit)        \
     121                 :            :         for (bit = ebitmap_start_positive(e, &n);   \
     122                 :            :              bit < ebitmap_length(e);                        \
     123                 :            :              bit = ebitmap_next_positive(e, &n, bit))       \
     124                 :            : 
     125                 :            : int ebitmap_cmp(struct ebitmap *e1, struct ebitmap *e2);
     126                 :            : int ebitmap_cpy(struct ebitmap *dst, struct ebitmap *src);
     127                 :            : int ebitmap_and(struct ebitmap *dst, struct ebitmap *e1, struct ebitmap *e2);
     128                 :            : int ebitmap_contains(struct ebitmap *e1, struct ebitmap *e2, u32 last_e2bit);
     129                 :            : int ebitmap_get_bit(struct ebitmap *e, unsigned long bit);
     130                 :            : int ebitmap_set_bit(struct ebitmap *e, unsigned long bit, int value);
     131                 :            : void ebitmap_destroy(struct ebitmap *e);
     132                 :            : int ebitmap_read(struct ebitmap *e, void *fp);
     133                 :            : int ebitmap_write(struct ebitmap *e, void *fp);
     134                 :            : 
     135                 :            : #ifdef CONFIG_NETLABEL
     136                 :            : int ebitmap_netlbl_export(struct ebitmap *ebmap,
     137                 :            :                           struct netlbl_lsm_catmap **catmap);
     138                 :            : int ebitmap_netlbl_import(struct ebitmap *ebmap,
     139                 :            :                           struct netlbl_lsm_catmap *catmap);
     140                 :            : #else
     141                 :            : static inline int ebitmap_netlbl_export(struct ebitmap *ebmap,
     142                 :            :                                         struct netlbl_lsm_catmap **catmap)
     143                 :            : {
     144                 :            :         return -ENOMEM;
     145                 :            : }
     146                 :            : static inline int ebitmap_netlbl_import(struct ebitmap *ebmap,
     147                 :            :                                         struct netlbl_lsm_catmap *catmap)
     148                 :            : {
     149                 :            :         return -ENOMEM;
     150                 :            : }
     151                 :            : #endif
     152                 :            : 
     153                 :            : #endif  /* _SS_EBITMAP_H_ */

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