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
  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(__u32 daddr);
  55 extern u32 secure_tcp_port_ephemeral(__u32 saddr, __u32 daddr, __u16 dport);
  56 extern u32 secure_tcpv6_port_ephemeral(const __u32 *saddr, const __u32 *daddr,
  57                                        __u16 dport);
  58 extern __u32 secure_tcp_sequence_number(__u32 saddr, __u32 daddr,
  59                                         __u16 sport, __u16 dport);
  60 extern __u32 secure_tcpv6_sequence_number(__u32 *saddr, __u32 *daddr,
  61                                           __u16 sport, __u16 dport);
  62
  63 #ifndef MODULE
  64 extern struct file_operations random_fops, urandom_fops;
  65 #endif
  66
  67 unsigned int get_random_int(void);
  68 unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len);
  69
  70 #endif /* __KERNEL___ */
  71
  72 #endif /* _LINUX_RANDOM_H */