1
2
3
4
5
6
7#ifndef _LINUX_RANDOM_H
8#define _LINUX_RANDOM_H
9
10#include <linux/list.h>
11#include <linux/once.h>
12
13#include <uapi/linux/random.h>
14
15struct random_ready_callback {
16 struct list_head list;
17 void (*func)(struct random_ready_callback *rdy);
18 struct module *owner;
19};
20
21extern void add_device_randomness(const void *, unsigned int);
22
23#if defined(LATENT_ENTROPY_PLUGIN) && !defined(__CHECKER__)
24static inline void add_latent_entropy(void)
25{
26 add_device_randomness((const void *)&latent_entropy,
27 sizeof(latent_entropy));
28}
29#else
30static inline void add_latent_entropy(void) {}
31#endif
32
33extern void add_input_randomness(unsigned int type, unsigned int code,
34 unsigned int value) __latent_entropy;
35extern void add_interrupt_randomness(int irq, int irq_flags) __latent_entropy;
36
37extern void get_random_bytes(void *buf, int nbytes);
38extern int wait_for_random_bytes(void);
39extern int __init rand_initialize(void);
40extern bool rng_is_initialized(void);
41extern int add_random_ready_callback(struct random_ready_callback *rdy);
42extern void del_random_ready_callback(struct random_ready_callback *rdy);
43extern int __must_check get_random_bytes_arch(void *buf, int nbytes);
44
45#ifndef MODULE
46extern const struct file_operations random_fops, urandom_fops;
47#endif
48
49u32 get_random_u32(void);
50u64 get_random_u64(void);
51static inline unsigned int get_random_int(void)
52{
53 return get_random_u32();
54}
55static inline unsigned long get_random_long(void)
56{
57#if BITS_PER_LONG == 64
58 return get_random_u64();
59#else
60 return get_random_u32();
61#endif
62}
63
64
65
66
67
68#ifdef CONFIG_64BIT
69# ifdef __LITTLE_ENDIAN
70# define CANARY_MASK 0xffffffffffffff00UL
71# else
72# define CANARY_MASK 0x00ffffffffffffffUL
73# endif
74#else
75# define CANARY_MASK 0xffffffffUL
76#endif
77
78static inline unsigned long get_random_canary(void)
79{
80 unsigned long val = get_random_long();
81
82 return val & CANARY_MASK;
83}
84
85
86
87static inline int get_random_bytes_wait(void *buf, int nbytes)
88{
89 int ret = wait_for_random_bytes();
90 get_random_bytes(buf, nbytes);
91 return ret;
92}
93
94#define declare_get_random_var_wait(var) \
95 static inline int get_random_ ## var ## _wait(var *out) { \
96 int ret = wait_for_random_bytes(); \
97 if (unlikely(ret)) \
98 return ret; \
99 *out = get_random_ ## var(); \
100 return 0; \
101 }
102declare_get_random_var_wait(u32)
103declare_get_random_var_wait(u64)
104declare_get_random_var_wait(int)
105declare_get_random_var_wait(long)
106#undef declare_get_random_var
107
108unsigned long randomize_page(unsigned long start, unsigned long range);
109
110u32 prandom_u32(void);
111void prandom_bytes(void *buf, size_t nbytes);
112void prandom_seed(u32 seed);
113void prandom_reseed_late(void);
114
115struct rnd_state {
116 __u32 s1, s2, s3, s4;
117};
118
119u32 prandom_u32_state(struct rnd_state *state);
120void prandom_bytes_state(struct rnd_state *state, void *buf, size_t nbytes);
121void prandom_seed_full_state(struct rnd_state __percpu *pcpu_state);
122
123#define prandom_init_once(pcpu_state) \
124 DO_ONCE(prandom_seed_full_state, (pcpu_state))
125
126
127
128
129
130
131
132
133
134
135
136
137
138static inline u32 prandom_u32_max(u32 ep_ro)
139{
140 return (u32)(((u64) prandom_u32() * ep_ro) >> 32);
141}
142
143
144
145
146static inline u32 __seed(u32 x, u32 m)
147{
148 return (x < m) ? x + m : x;
149}
150
151
152
153
154
155
156static inline void prandom_seed_state(struct rnd_state *state, u64 seed)
157{
158 u32 i = (seed >> 32) ^ (seed << 10) ^ seed;
159
160 state->s1 = __seed(i, 2U);
161 state->s2 = __seed(i, 8U);
162 state->s3 = __seed(i, 16U);
163 state->s4 = __seed(i, 128U);
164}
165
166#ifdef CONFIG_ARCH_RANDOM
167# include <asm/archrandom.h>
168#else
169static inline bool arch_get_random_long(unsigned long *v)
170{
171 return 0;
172}
173static inline bool arch_get_random_int(unsigned int *v)
174{
175 return 0;
176}
177static inline bool arch_has_random(void)
178{
179 return 0;
180}
181static inline bool arch_get_random_seed_long(unsigned long *v)
182{
183 return 0;
184}
185static inline bool arch_get_random_seed_int(unsigned int *v)
186{
187 return 0;
188}
189static inline bool arch_has_random_seed(void)
190{
191 return 0;
192}
193#endif
194
195
196static inline u32 next_pseudo_random32(u32 seed)
197{
198 return seed * 1664525 + 1013904223;
199}
200
201#endif
202