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 */ 79