LXR linux/include/linux/random.h

   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
  35struct 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
  45extern void rand_initialize_irq(int irq);
  46
  47extern void add_input_randomness(unsigned int type, unsigned int code,
  48                                 unsigned int value);
  49extern void add_interrupt_randomness(int irq);
  50
  51extern void get_random_bytes(void *buf, int nbytes);
  52void generate_random_uuid(unsigned char uuid_out[16]);
  53
  54extern __u32 secure_ip_id(__be32 daddr);
  55extern u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport);
  56extern u32 secure_ipv6_port_ephemeral(const __be32 *saddr, const __be32 *daddr,
  57                                      __be16 dport);
  58extern __u32 secure_tcp_sequence_number(__be32 saddr, __be32 daddr,
  59                                        __be16 sport, __be16 dport);
  60extern __u32 secure_tcpv6_sequence_number(__be32 *saddr, __be32 *daddr,
  61                                          __be16 sport, __be16 dport);
  62extern u64 secure_dccp_sequence_number(__be32 saddr, __be32 daddr,
  63                                       __be16 sport, __be16 dport);
  64
  65#ifndef MODULE
  66extern const struct file_operations random_fops, urandom_fops;
  67#endif
  68
  69unsigned int get_random_int(void);
  70unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len);
  71
  72u32 random32(void);
  73void srandom32(u32 seed);
  74
  75#endif /* __KERNEL___ */
  76
  77#endif /* _LINUX_RANDOM_H */
  78