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 37 struct rand_pool_info { 38 int entropy_count; 39 int buf_size; 40 __u32 buf[0]; 41 }; 42 43 /* Exported functions */ 44 45 #ifdef __KERNEL__ 46 47 extern void rand_initialize_irq(int irq); 48 49 extern void add_input_randomness(unsigned int type, unsigned int code, 50 unsigned int value); 51 extern void add_interrupt_randomness(int irq); 52 53 extern void get_random_bytes(void *buf, int nbytes); 54 void generate_random_uuid(unsigned char uuid_out[16]); 55 56 extern __u32 secure_ip_id(__be32 daddr); 57 extern u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport); 58 extern u32 secure_ipv6_port_ephemeral(const __be32 *saddr, const __be32 *daddr, 59 __be16 dport); 60 extern __u32 secure_tcp_sequence_number(__be32 saddr, __be32 daddr, 61 __be16 sport, __be16 dport); 62 extern __u32 secure_tcpv6_sequence_number(__be32 *saddr, __be32 *daddr, 63 __be16 sport, __be16 dport); 64 extern u64 secure_dccp_sequence_number(__be32 saddr, __be32 daddr, 65 __be16 sport, __be16 dport); 66 67 #ifndef MODULE 68 extern const struct file_operations random_fops, urandom_fops; 69 #endif 70 71 unsigned int get_random_int(void); 72 unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len); 73 74 u32 random32(void); 75 void srandom32(u32 seed); 76 77 #endif /* __KERNEL___ */ 78 79 #endif /* _LINUX_RANDOM_H */ 80