2 * include/linux/random.h
4 * Include file for the random number generator.
7 #ifndef _LINUX_RANDOM_H
8 #define _LINUX_RANDOM_H
10 #include <linux/types.h>
11 #include <linux/ioctl.h>
12 #include <linux/irqnr.h>
14 /* ioctl()'s for the random number generator */
16 /* Get the entropy count. */
17 #define RNDGETENTCNT _IOR( 'R', 0x00, int )
19 /* Add to (or subtract from) the entropy count. (Superuser only.) */
20 #define RNDADDTOENTCNT _IOW( 'R', 0x01, int )
22 /* Get the contents of the entropy pool. (Superuser only.) */
23 #define RNDGETPOOL _IOR( 'R', 0x02, int [2] )
26 * Write bytes into the entropy pool and add to the entropy count.
29 #define RNDADDENTROPY _IOW( 'R', 0x03, int [2] )
31 /* Clear entropy count to 0. (Superuser only.) */
32 #define RNDZAPENTCNT _IO( 'R', 0x04 )
34 /* Clear the entropy pool and associated counters. (Superuser only.) */
35 #define RNDCLEARPOOL _IO( 'R', 0x06 )
37 struct rand_pool_info
{
47 /* Exported functions */
51 extern void rand_initialize_irq(int irq
);
53 extern void add_input_randomness(unsigned int type
, unsigned int code
,
55 extern void add_interrupt_randomness(int irq
);
57 extern void get_random_bytes(void *buf
, int nbytes
);
58 void generate_random_uuid(unsigned char uuid_out
[16]);
60 extern __u32
secure_ip_id(__be32 daddr
);
61 extern __u32
secure_ipv6_id(const __be32 daddr
[4]);
62 extern u32
secure_ipv4_port_ephemeral(__be32 saddr
, __be32 daddr
, __be16 dport
);
63 extern u32
secure_ipv6_port_ephemeral(const __be32
*saddr
, const __be32
*daddr
,
65 extern __u32
secure_tcp_sequence_number(__be32 saddr
, __be32 daddr
,
66 __be16 sport
, __be16 dport
);
67 extern __u32
secure_tcpv6_sequence_number(__be32
*saddr
, __be32
*daddr
,
68 __be16 sport
, __be16 dport
);
69 extern u64
secure_dccp_sequence_number(__be32 saddr
, __be32 daddr
,
70 __be16 sport
, __be16 dport
);
73 extern const struct file_operations random_fops
, urandom_fops
;
76 unsigned int get_random_int(void);
77 unsigned long randomize_range(unsigned long start
, unsigned long end
, unsigned long len
);
80 void srandom32(u32 seed
);
82 u32
prandom32(struct rnd_state
*);
85 * Handle minimum values for seeds
87 static inline u32
__seed(u32 x
, u32 m
)
89 return (x
< m
) ? x
+ m
: x
;
93 * prandom32_seed - set seed for prandom32().
94 * @state: pointer to state structure to receive the seed.
95 * @seed: arbitrary 64-bit value to use as a seed.
97 static inline void prandom32_seed(struct rnd_state
*state
, u64 seed
)
99 u32 i
= (seed
>> 32) ^ (seed
<< 10) ^ seed
;
101 state
->s1
= __seed(i
, 1);
102 state
->s2
= __seed(i
, 7);
103 state
->s3
= __seed(i
, 15);
106 #endif /* __KERNEL___ */
108 #endif /* _LINUX_RANDOM_H */