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