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 43struct rnd_state { 44 __u32 s1, s2, s3; 45}; 46 47/* Exported functions */ 48 49#ifdef __KERNEL__ 50 51extern void rand_initialize_irq(int irq); 52 53extern void add_input_randomness(unsigned int type, unsigned int code, 54 unsigned int value); 55extern void add_interrupt_randomness(int irq); 56 57extern void get_random_bytes(void *buf, int nbytes); 58void generate_random_uuid(unsigned char uuid_out[16]); 59 60extern __u32 secure_ip_id(__be32 daddr); 61extern u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport); 62extern u32 secure_ipv6_port_ephemeral(const __be32 *saddr, const __be32 *daddr, 63 __be16 dport); 64extern __u32 secure_tcp_sequence_number(__be32 saddr, __be32 daddr, 65 __be16 sport, __be16 dport); 66extern __u32 secure_tcpv6_sequence_number(__be32 *saddr, __be32 *daddr, 67 __be16 sport, __be16 dport); 68extern u64 secure_dccp_sequence_number(__be32 saddr, __be32 daddr, 69 __be16 sport, __be16 dport); 70 71#ifndef MODULE 72extern const struct file_operations random_fops, urandom_fops; 73#endif 74 75unsigned int get_random_int(void); 76unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len); 77 78u32 random32(void); 79void srandom32(u32 seed); 80 81u32 prandom32(struct rnd_state *); 82 83/* 84 * Handle minimum values for seeds 85 */ 86static inline u32 __seed(u32 x, u32 m) 87{ 88 return (x < m) ? x + m : x; 89} 90 91/** 92 * prandom32_seed - set seed for prandom32(). 93 * @state: pointer to state structure to receive the seed. 94 * @seed: arbitrary 64-bit value to use as a seed. 95 */ 96static inline void prandom32_seed(struct rnd_state *state, u64 seed) 97{ 98 u32 i = (seed >> 32) ^ (seed << 10) ^ seed; 99 100 state->s1 = __seed(i, 1); 101 state->s2 = __seed(i, 7); 102 state->s3 = __seed(i, 15); 103} 104 105#endif /* __KERNEL___ */ 106 107#endif /* _LINUX_RANDOM_H */ 108