2 * include/linux/random.h
4 * Include file for the random number generator.
7 #ifndef _LINUX_RANDOM_H
8 #define _LINUX_RANDOM_H
10 #include <linux/ioctl.h>
12 /* ioctl()'s for the random number generator */
14 /* Get the entropy count. */
15 #define RNDGETENTCNT _IOR( 'R', 0x00, int )
17 /* Add to (or subtract from) the entropy count. (Superuser only.) */
18 #define RNDADDTOENTCNT _IOW( 'R', 0x01, int )
20 /* Get the contents of the entropy pool. (Superuser only.) */
21 #define RNDGETPOOL _IOR( 'R', 0x02, int [2] )
24 * Write bytes into the entropy pool and add to the entropy count.
27 #define RNDADDENTROPY _IOW( 'R', 0x03, int [2] )
29 /* Clear entropy count to 0. (Superuser only.) */
30 #define RNDZAPENTCNT _IO( 'R', 0x04 )
32 /* Clear the entropy pool and associated counters. (Superuser only.) */
33 #define RNDCLEARPOOL _IO( 'R', 0x06 )
35 struct rand_pool_info {
41 /* Exported functions */
45 extern void rand_initialize_irq(int irq);
47 struct timer_rand_state;
48 #ifndef CONFIG_SPARSE_IRQ
50 extern struct timer_rand_state *irq_timer_state[];
53 static inline struct timer_rand_state *get_timer_rand_state(unsigned int irq)
58 return irq_timer_state[irq];
61 static inline void set_timer_rand_state(unsigned int irq, struct timer_rand_state *state)
66 irq_timer_state[irq] = state;
71 #include <linux/irq.h>
72 static inline struct timer_rand_state *get_timer_rand_state(unsigned int irq)
74 struct irq_desc *desc;
76 desc = irq_to_desc(irq);
81 return desc->timer_rand_state;
84 static inline void set_timer_rand_state(unsigned int irq, struct timer_rand_state *state)
86 struct irq_desc *desc;
88 desc = irq_to_desc(irq);
93 desc->timer_rand_state = state;
98 extern void add_input_randomness(unsigned int type, unsigned int code,
100 extern void add_interrupt_randomness(int irq);
102 extern void get_random_bytes(void *buf, int nbytes);
103 void generate_random_uuid(unsigned char uuid_out[16]);
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,
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);
117 extern const struct file_operations random_fops, urandom_fops;
120 unsigned int get_random_int(void);
121 unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len);
124 void srandom32(u32 seed);
126 #endif /* __KERNEL___ */
128 #endif /* _LINUX_RANDOM_H */