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/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
  37struct rand_pool_info {
  38        int     entropy_count;
  39        int     buf_size;
  40        __u32   buf[0];
  41};
  42
  43/* Exported functions */
  44
  45#ifdef __KERNEL__
  46
  47extern void rand_initialize_irq(int irq);
  48
  49extern void add_input_randomness(unsigned int type, unsigned int code,
  50                                 unsigned int value);
  51extern void add_interrupt_randomness(int irq);
  52
  53extern void get_random_bytes(void *buf, int nbytes);
  54void generate_random_uuid(unsigned char uuid_out[16]);
  55
  56extern __u32 secure_ip_id(__be32 daddr);
  57extern u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport);
  58extern u32 secure_ipv6_port_ephemeral(const __be32 *saddr, const __be32 *daddr,
  59                                      __be16 dport);
  60extern __u32 secure_tcp_sequence_number(__be32 saddr, __be32 daddr,
  61                                        __be16 sport, __be16 dport);
  62extern __u32 secure_tcpv6_sequence_number(__be32 *saddr, __be32 *daddr,
  63                                          __be16 sport, __be16 dport);
  64extern u64 secure_dccp_sequence_number(__be32 saddr, __be32 daddr,
  65                                       __be16 sport, __be16 dport);
  66
  67#ifndef MODULE
  68extern const struct file_operations random_fops, urandom_fops;
  69#endif
  70
  71unsigned int get_random_int(void);
  72unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len);
  73
  74u32 random32(void);
  75void srandom32(u32 seed);
  76
  77#endif /* __KERNEL___ */
  78
  79#endif /* _LINUX_RANDOM_H */
  80