[deliverable/linux.git] / include / linux / random.h

/*
 * 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_irq(int irq);

struct timer_rand_state;
#ifndef CONFIG_SPARSE_IRQ

extern struct timer_rand_state *irq_timer_state[];

extern int nr_irqs;
static inline struct timer_rand_state *get_timer_rand_state(unsigned int irq)
{
	if (irq >= nr_irqs)
		return NULL;

	return irq_timer_state[irq];
}

static inline void set_timer_rand_state(unsigned int irq, struct timer_rand_state *state)
{
	if (irq >= nr_irqs)
		return;

	irq_timer_state[irq] = state;
}

#else

#include <linux/irq.h>
static inline struct timer_rand_state *get_timer_rand_state(unsigned int irq)
{
	struct irq_desc *desc;

	desc = irq_to_desc(irq);

	if (!desc)
		return NULL;

	return desc->timer_rand_state;
}

static inline void set_timer_rand_state(unsigned int irq, struct timer_rand_state *state)
{
	struct irq_desc *desc;

	desc = irq_to_desc(irq);

	if (!desc)
		return;

	desc->timer_rand_state = state;
}
#endif


extern void add_input_randomness(unsigned int type, unsigned int code,
				 unsigned int value);
extern void add_interrupt_randomness(int irq);

extern void get_random_bytes(void *buf, int nbytes);
void generate_random_uuid(unsigned char uuid_out[16]);

extern __u32 secure_ip_id(__be32 daddr);
extern u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport);
extern u32 secure_ipv6_port_ephemeral(const __be32 *saddr, const __be32 *daddr,
				      __be16 dport);
extern __u32 secure_tcp_sequence_number(__be32 saddr, __be32 daddr,
					__be16 sport, __be16 dport);
extern __u32 secure_tcpv6_sequence_number(__be32 *saddr, __be32 *daddr,
					  __be16 sport, __be16 dport);
extern u64 secure_dccp_sequence_number(__be32 saddr, __be32 daddr,
				       __be16 sport, __be16 dport);

#ifndef MODULE
extern const struct file_operations random_fops, urandom_fops;
#endif

unsigned int get_random_int(void);
unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len);

u32 random32(void);
void srandom32(u32 seed);

#endif /* __KERNEL___ */

#endif /* _LINUX_RANDOM_H */
Commit	Line	Data
1da177e4 LT	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
	12	/* ioctl()'s for the random number generator */
	13
	14	/* Get the entropy count. */
	15	#define RNDGETENTCNT _IOR( 'R', 0x00, int )
	16
	17	/* Add to (or subtract from) the entropy count. (Superuser only.) */
	18	#define RNDADDTOENTCNT _IOW( 'R', 0x01, int )
	19
	20	/* Get the contents of the entropy pool. (Superuser only.) */
	21	#define RNDGETPOOL _IOR( 'R', 0x02, int [2] )
	22
	23	/*
	24	* Write bytes into the entropy pool and add to the entropy count.
	25	* (Superuser only.)
	26	*/
	27	#define RNDADDENTROPY _IOW( 'R', 0x03, int [2] )
	28
	29	/* Clear entropy count to 0. (Superuser only.) */
	30	#define RNDZAPENTCNT _IO( 'R', 0x04 )
	31
	32	/* Clear the entropy pool and associated counters. (Superuser only.) */
	33	#define RNDCLEARPOOL _IO( 'R', 0x06 )
	34
	35	struct rand_pool_info {
	36	int entropy_count;
	37	int buf_size;
	38	__u32 buf[0];
	39	};
	40
	41	/* Exported functions */
	42
	43	#ifdef __KERNEL__
	44
	45	extern void rand_initialize_irq(int irq);
	46
0b8f1efa YL	47	struct timer_rand_state;
	48	#ifndef CONFIG_SPARSE_IRQ
	49
	50	extern struct timer_rand_state *irq_timer_state[];
	51
	52	extern int nr_irqs;
	53	static inline struct timer_rand_state *get_timer_rand_state(unsigned int irq)
	54	{
	55	if (irq >= nr_irqs)
	56	return NULL;
	57
	58	return irq_timer_state[irq];
	59	}
	60
	61	static inline void set_timer_rand_state(unsigned int irq, struct timer_rand_state *state)
	62	{
	63	if (irq >= nr_irqs)
	64	return;
	65
	66	irq_timer_state[irq] = state;
	67	}
	68
	69	#else
	70
	71	#include <linux/irq.h>
	72	static inline struct timer_rand_state *get_timer_rand_state(unsigned int irq)
	73	{
	74	struct irq_desc *desc;
	75
	76	desc = irq_to_desc(irq);
	77
	78	if (!desc)
	79	return NULL;
	80
	81	return desc->timer_rand_state;
	82	}
	83
	84	static inline void set_timer_rand_state(unsigned int irq, struct timer_rand_state *state)
	85	{
	86	struct irq_desc *desc;
	87
	88	desc = irq_to_desc(irq);
	89
	90	if (!desc)
	91	return;
	92
	93	desc->timer_rand_state = state;
	94	}
	95	#endif
	96
	97
1da177e4 LT	98	extern void add_input_randomness(unsigned int type, unsigned int code,
	99	unsigned int value);
	100	extern void add_interrupt_randomness(int irq);
	101
	102	extern void get_random_bytes(void *buf, int nbytes);
	103	void generate_random_uuid(unsigned char uuid_out[16]);
	104
b09b845c AV	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,
	108	__be16 dport);
	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);
1da177e4 LT	115
1da177e4 LT	116	#ifndef MODULE
54047320	117	extern const struct file_operations random_fops, urandom_fops;
1da177e4 LT	118	#endif
	119
	120	unsigned int get_random_int(void);
	121	unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len);
	122
aaa248f6 SH	123	u32 random32(void);
	124	void srandom32(u32 seed);
	125
1da177e4 LT	126	#endif /* __KERNEL___ */
	127
	128	#endif /* _LINUX_RANDOM_H */