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/*
 * include/linux/random.h
 *
 * Include file for the random number generator.
 */
 
#ifndef _LINUX_RANDOM_H
#define _LINUX_RANDOM_H
 
#include <linux/ioctl.h>
 
/* ioctl()'s for the random number generator */
 
/* Get the entropy count. */
#define RNDGETENTCNT	_IOR( 'R', 0x00, int )
 
/* Add to (or subtract from) the entropy count.  (Superuser only.) */
#define RNDADDTOENTCNT	_IOW( 'R', 0x01, int )
 
/* Get the contents of the entropy pool.  (Superuser only.) */
#define RNDGETPOOL	_IOR( 'R', 0x02, int [2] )
 
/* 
 * Write bytes into the entropy pool and add to the entropy count.
 * (Superuser only.)
 */
#define RNDADDENTROPY	_IOW( 'R', 0x03, int [2] )
 
/* Clear entropy count to 0.  (Superuser only.) */
#define RNDZAPENTCNT	_IO( 'R', 0x04 )
 
/* Clear the entropy pool and associated counters.  (Superuser only.) */
#define RNDCLEARPOOL	_IO( 'R', 0x06 )
 
struct rand_pool_info {
	int	entropy_count;
	int	buf_size;
	__u32	buf[0];
};
 
/* Exported functions */
 
#ifdef __KERNEL__
 
extern void rand_initialize(void);
extern void rand_initialize_irq(int irq);
extern void rand_initialize_blkdev(int irq, int mode);
 
extern void add_keyboard_randomness(unsigned char scancode);
extern void add_mouse_randomness(__u32 mouse_data);
extern void add_interrupt_randomness(int irq);
extern void add_blkdev_randomness(int major);
 
extern void get_random_bytes(void *buf, int nbytes);
 
extern __u32 secure_tcp_sequence_number(__u32 saddr, __u32 daddr,
					__u16 sport, __u16 dport);
__u32 secure_tcp_probe_number(__u32 saddr, __u32 daddr,
                 __u16 sport, __u16 dport, __u32 sseq, int validate);
 
__u32 secure_tcp_syn_cookie(__u32 saddr, __u32 daddr,
                 __u16 sport, __u16 dport, __u32 sseq, __u32 count);
 
#ifndef MODULE
extern struct file_operations random_fops, urandom_fops;
#endif
 
#endif /* __KERNEL___ */
 
#endif /* _LINUX_RANDOM_H */