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 {
43 /* Exported functions */
47 extern void rand_initialize_irq(int irq);
49 extern void add_input_randomness(unsigned int type, unsigned int code,
51 extern void add_interrupt_randomness(int irq);
53 extern void get_random_bytes(void *buf, int nbytes);
54 void generate_random_uuid(unsigned char uuid_out[16]);
56 extern __u32 secure_ip_id(__be32 daddr);
57 extern u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport);
58 extern u32 secure_ipv6_port_ephemeral(const __be32 *saddr, const __be32 *daddr,
60 extern __u32 secure_tcp_sequence_number(__be32 saddr, __be32 daddr,
61 __be16 sport, __be16 dport);
62 extern __u32 secure_tcpv6_sequence_number(__be32 *saddr, __be32 *daddr,
63 __be16 sport, __be16 dport);
64 extern u64 secure_dccp_sequence_number(__be32 saddr, __be32 daddr,
65 __be16 sport, __be16 dport);
68 extern const struct file_operations random_fops, urandom_fops;
71 unsigned int get_random_int(void);
72 unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len);
75 void srandom32(u32 seed);
77 #endif /* __KERNEL___ */
79 #endif /* _LINUX_RANDOM_H */