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16#ifndef _SS_CONTEXT_H_
17#define _SS_CONTEXT_H_
18
19#include "ebitmap.h"
20#include "mls_types.h"
21#include "security.h"
22
23
24
25
26
27struct context {
28 u32 user;
29 u32 role;
30 u32 type;
31 u32 len;
32 struct mls_range range;
33 char *str;
34};
35
36static inline void mls_context_init(struct context *c)
37{
38 memset(&c->range, 0, sizeof(c->range));
39}
40
41static inline int mls_context_cpy(struct context *dst, struct context *src)
42{
43 int rc;
44
45 dst->range.level[0].sens = src->range.level[0].sens;
46 rc = ebitmap_cpy(&dst->range.level[0].cat, &src->range.level[0].cat);
47 if (rc)
48 goto out;
49
50 dst->range.level[1].sens = src->range.level[1].sens;
51 rc = ebitmap_cpy(&dst->range.level[1].cat, &src->range.level[1].cat);
52 if (rc)
53 ebitmap_destroy(&dst->range.level[0].cat);
54out:
55 return rc;
56}
57
58
59
60
61static inline int mls_context_cpy_low(struct context *dst, struct context *src)
62{
63 int rc;
64
65 dst->range.level[0].sens = src->range.level[0].sens;
66 rc = ebitmap_cpy(&dst->range.level[0].cat, &src->range.level[0].cat);
67 if (rc)
68 goto out;
69
70 dst->range.level[1].sens = src->range.level[0].sens;
71 rc = ebitmap_cpy(&dst->range.level[1].cat, &src->range.level[0].cat);
72 if (rc)
73 ebitmap_destroy(&dst->range.level[0].cat);
74out:
75 return rc;
76}
77
78
79
80
81static inline int mls_context_cpy_high(struct context *dst, struct context *src)
82{
83 int rc;
84
85 dst->range.level[0].sens = src->range.level[1].sens;
86 rc = ebitmap_cpy(&dst->range.level[0].cat, &src->range.level[1].cat);
87 if (rc)
88 goto out;
89
90 dst->range.level[1].sens = src->range.level[1].sens;
91 rc = ebitmap_cpy(&dst->range.level[1].cat, &src->range.level[1].cat);
92 if (rc)
93 ebitmap_destroy(&dst->range.level[0].cat);
94out:
95 return rc;
96}
97
98static inline int mls_context_cmp(struct context *c1, struct context *c2)
99{
100 return ((c1->range.level[0].sens == c2->range.level[0].sens) &&
101 ebitmap_cmp(&c1->range.level[0].cat, &c2->range.level[0].cat) &&
102 (c1->range.level[1].sens == c2->range.level[1].sens) &&
103 ebitmap_cmp(&c1->range.level[1].cat, &c2->range.level[1].cat));
104}
105
106static inline void mls_context_destroy(struct context *c)
107{
108 ebitmap_destroy(&c->range.level[0].cat);
109 ebitmap_destroy(&c->range.level[1].cat);
110 mls_context_init(c);
111}
112
113static inline void context_init(struct context *c)
114{
115 memset(c, 0, sizeof(*c));
116}
117
118static inline int context_cpy(struct context *dst, struct context *src)
119{
120 int rc;
121
122 dst->user = src->user;
123 dst->role = src->role;
124 dst->type = src->type;
125 if (src->str) {
126 dst->str = kstrdup(src->str, GFP_ATOMIC);
127 if (!dst->str)
128 return -ENOMEM;
129 dst->len = src->len;
130 } else {
131 dst->str = NULL;
132 dst->len = 0;
133 }
134 rc = mls_context_cpy(dst, src);
135 if (rc) {
136 kfree(dst->str);
137 return rc;
138 }
139 return 0;
140}
141
142static inline void context_destroy(struct context *c)
143{
144 c->user = c->role = c->type = 0;
145 kfree(c->str);
146 c->str = NULL;
147 c->len = 0;
148 mls_context_destroy(c);
149}
150
151static inline int context_cmp(struct context *c1, struct context *c2)
152{
153 if (c1->len && c2->len)
154 return (c1->len == c2->len && !strcmp(c1->str, c2->str));
155 if (c1->len || c2->len)
156 return 0;
157 return ((c1->user == c2->user) &&
158 (c1->role == c2->role) &&
159 (c1->type == c2->type) &&
160 mls_context_cmp(c1, c2));
161}
162
163#endif
164
165