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/ioctl.h>
11
12 /* ioctl()'s for the random number generator */
13
14 /* Get the entropy count. */
15 #define RNDGETENTCNT _IOR( 'R', 0x00, int )
16
17 /* Add to (or subtract from) the entropy count. (Superuser only.) */
18 #define RNDADDTOENTCNT _IOW( 'R', 0x01, int )
19
20 /* Get the contents of the entropy pool. (Superuser only.) */
21 #define RNDGETPOOL _IOR( 'R', 0x02, int [2] )
22
23 /*
24 * Write bytes into the entropy pool and add to the entropy count.
25 * (Superuser only.)
26 */
27 #define RNDADDENTROPY _IOW( 'R', 0x03, int [2] )
28
29 /* Clear entropy count to 0. (Superuser only.) */
30 #define RNDZAPENTCNT _IO( 'R', 0x04 )
31
32 /* Clear the entropy pool and associated counters. (Superuser only.) */
33 #define RNDCLEARPOOL _IO( 'R', 0x06 )
34
35 struct rand_pool_info {
36 int entropy_count;
37 int buf_size;
38 __u32 buf[0];
39 };
40
41 /* Exported functions */
42
43 #ifdef __KERNEL__
44
45 extern void rand_initialize_irq(int irq);
46
47 extern void add_input_randomness(unsigned int type, unsigned int code,
48 unsigned int value);
49 extern void add_interrupt_randomness(int irq);
50
51 extern void get_random_bytes(void *buf, int nbytes);
52 void generate_random_uuid(unsigned char uuid_out[16]);
53
54 extern __u32 secure_ip_id(__be32 daddr);
55 extern u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport);
56 extern u32 secure_ipv6_port_ephemeral(const __be32 *saddr, const __be32 *daddr,
57 __be16 dport);
58 extern __u32 secure_tcp_sequence_number(__be32 saddr, __be32 daddr,
59 __be16 sport, __be16 dport);
60 extern __u32 secure_tcpv6_sequence_number(__be32 *saddr, __be32 *daddr,
61 __be16 sport, __be16 dport);
62 extern u64 secure_dccp_sequence_number(__be32 saddr, __be32 daddr,
63 __be16 sport, __be16 dport);
64
65 #ifndef MODULE
66 extern const struct file_operations random_fops, urandom_fops;
67 #endif
68
69 unsigned int get_random_int(void);
70 unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len);
71
72 u32 random32(void);
73 void srandom32(u32 seed);
74
75 #endif /* __KERNEL___ */
76
77 #endif /* _LINUX_RANDOM_H */
78
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