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1 | /* |
2 | * include/linux/random.h |
3 | * |
4 | * Include file for the random number generator. |
5 | */ |
6 | |
7 | #ifndef _LINUX_RANDOM_H |
8 | #define _LINUX_RANDOM_H |
9 | |
10 | #include <linux/types.h> |
11 | #include <linux/ioctl.h> |
12 | #include <linux/irqnr.h> |
13 | |
14 | /* ioctl()'s for the random number generator */ |
15 | |
16 | /* Get the entropy count. */ |
17 | #define RNDGETENTCNT _IOR( 'R', 0x00, int ) |
18 | |
19 | /* Add to (or subtract from) the entropy count. (Superuser only.) */ |
20 | #define RNDADDTOENTCNT _IOW( 'R', 0x01, int ) |
21 | |
22 | /* Get the contents of the entropy pool. (Superuser only.) */ |
23 | #define RNDGETPOOL _IOR( 'R', 0x02, int [2] ) |
24 | |
25 | /* |
26 | * Write bytes into the entropy pool and add to the entropy count. |
27 | * (Superuser only.) |
28 | */ |
29 | #define RNDADDENTROPY _IOW( 'R', 0x03, int [2] ) |
30 | |
31 | /* Clear entropy count to 0. (Superuser only.) */ |
32 | #define RNDZAPENTCNT _IO( 'R', 0x04 ) |
33 | |
34 | /* Clear the entropy pool and associated counters. (Superuser only.) */ |
35 | #define RNDCLEARPOOL _IO( 'R', 0x06 ) |
36 | |
37 | struct rand_pool_info { |
38 | int entropy_count; |
39 | int buf_size; |
40 | __u32 buf[0]; |
41 | }; |
42 | |
43 | struct rnd_state { |
44 | __u32 s1, s2, s3; |
45 | }; |
46 | |
47 | /* Exported functions */ |
48 | |
49 | #ifdef __KERNEL__ |
50 | |
51 | extern void rand_initialize_irq(int irq); |
52 | |
53 | extern void add_input_randomness(unsigned int type, unsigned int code, |
54 | unsigned int value); |
55 | extern void add_interrupt_randomness(int irq); |
56 | |
57 | extern void get_random_bytes(void *buf, int nbytes); |
58 | void generate_random_uuid(unsigned char uuid_out[16]); |
59 | |
60 | extern __u32 secure_ip_id(__be32 daddr); |
61 | extern u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport); |
62 | extern u32 secure_ipv6_port_ephemeral(const __be32 *saddr, const __be32 *daddr, |
63 | __be16 dport); |
64 | extern __u32 secure_tcp_sequence_number(__be32 saddr, __be32 daddr, |
65 | __be16 sport, __be16 dport); |
66 | extern __u32 secure_tcpv6_sequence_number(__be32 *saddr, __be32 *daddr, |
67 | __be16 sport, __be16 dport); |
68 | extern u64 secure_dccp_sequence_number(__be32 saddr, __be32 daddr, |
69 | __be16 sport, __be16 dport); |
70 | |
71 | #ifndef MODULE |
72 | extern const struct file_operations random_fops, urandom_fops; |
73 | #endif |
74 | |
75 | unsigned int get_random_int(void); |
76 | unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len); |
77 | |
78 | u32 random32(void); |
79 | void srandom32(u32 seed); |
80 | |
81 | u32 prandom32(struct rnd_state *); |
82 | |
83 | /* |
84 | * Handle minimum values for seeds |
85 | */ |
86 | static inline u32 __seed(u32 x, u32 m) |
87 | { |
88 | return (x < m) ? x + m : x; |
89 | } |
90 | |
91 | /** |
92 | * prandom32_seed - set seed for prandom32(). |
93 | * @state: pointer to state structure to receive the seed. |
94 | * @seed: arbitrary 64-bit value to use as a seed. |
95 | */ |
96 | static inline void prandom32_seed(struct rnd_state *state, u64 seed) |
97 | { |
98 | u32 i = (seed >> 32) ^ (seed << 10) ^ seed; |
99 | |
100 | state->s1 = __seed(i, 1); |
101 | state->s2 = __seed(i, 7); |
102 | state->s3 = __seed(i, 15); |
103 | } |
104 | |
105 | #endif /* __KERNEL___ */ |
106 | |
107 | #endif /* _LINUX_RANDOM_H */ |
108 |
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