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