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 struct timer_rand_state;
  48 #ifndef CONFIG_SPARSE_IRQ
  49
  50 extern struct timer_rand_state *irq_timer_state[];
  51
  52 extern int nr_irqs;
  53 static inline struct timer_rand_state *get_timer_rand_state(unsigned int irq)
  54 {
  55         if (irq >= nr_irqs)
  56                 return NULL;
  57
  58         return irq_timer_state[irq];
  59 }
  60
  61 static inline void set_timer_rand_state(unsigned int irq, struct timer_rand_state *state)
  62 {
  63         if (irq >= nr_irqs)
  64                 return;
  65
  66         irq_timer_state[irq] = state;
  67 }
  68
  69 #else
  70
  71 #include <linux/irq.h>
  72 static inline struct timer_rand_state *get_timer_rand_state(unsigned int irq)
  73 {
  74         struct irq_desc *desc;
  75
  76         desc = irq_to_desc(irq);
  77
  78         if (!desc)
  79                 return NULL;
  80
  81         return desc->timer_rand_state;
  82 }
  83
  84 static inline void set_timer_rand_state(unsigned int irq, struct timer_rand_state *state)
  85 {
  86         struct irq_desc *desc;
  87
  88         desc = irq_to_desc(irq);
  89
  90         if (!desc)
  91                 return;
  92
  93         desc->timer_rand_state = state;
  94 }
  95 #endif
  96
  97
  98 extern void add_input_randomness(unsigned int type, unsigned int code,
  99                                  unsigned int value);
 100 extern void add_interrupt_randomness(int irq);
 101
 102 extern void get_random_bytes(void *buf, int nbytes);
 103 void generate_random_uuid(unsigned char uuid_out[16]);
 104
 105 extern __u32 secure_ip_id(__be32 daddr);
 106 extern u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport);
 107 extern u32 secure_ipv6_port_ephemeral(const __be32 *saddr, const __be32 *daddr,
 108                                       __be16 dport);
 109 extern __u32 secure_tcp_sequence_number(__be32 saddr, __be32 daddr,
 110                                         __be16 sport, __be16 dport);
 111 extern __u32 secure_tcpv6_sequence_number(__be32 *saddr, __be32 *daddr,
 112                                           __be16 sport, __be16 dport);
 113 extern u64 secure_dccp_sequence_number(__be32 saddr, __be32 daddr,
 114                                        __be16 sport, __be16 dport);
 115
 116 #ifndef MODULE
 117 extern const struct file_operations random_fops, urandom_fops;
 118 #endif
 119
 120 unsigned int get_random_int(void);
 121 unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len);
 122
 123 u32 random32(void);
 124 void srandom32(u32 seed);
 125
 126 #endif /* __KERNEL___ */
 127
 128 #endif /* _LINUX_RANDOM_H */