[net-next-2.6.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/types.h>
#include <linux/ioctl.h>
#include <linux/irqnr.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];
};

struct rnd_state {
	__u32 s1, s2, s3;
};

/* Exported functions */

#ifdef __KERNEL__

extern void rand_initialize_irq(int irq);

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);

u32 prandom32(struct rnd_state *);

/*
 * Handle minimum values for seeds
 */
static inline u32 __seed(u32 x, u32 m)
{
	return (x < m) ? x + m : x;
}

/**
 * prandom32_seed - set seed for prandom32().
 * @state: pointer to state structure to receive the seed.
 * @seed: arbitrary 64-bit value to use as a seed.
 */
static inline void prandom32_seed(struct rnd_state *state, u64 seed)
{
	u32 i = (seed >> 32) ^ (seed << 10) ^ seed;

	state->s1 = __seed(i, 1);
	state->s2 = __seed(i, 7);
	state->s3 = __seed(i, 15);
}

#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
68622c61	10	#include <linux/types.h>
1da177e4	11	#include <linux/ioctl.h>
0ebb26e7	12	#include <linux/irqnr.h>
1da177e4 LT	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
5960164f JE	43	struct rnd_state {
	44	__u32 s1, s2, s3;
	45	};
	46
1da177e4 LT	47	/* Exported functions */
	48
	49	#ifdef __KERNEL__
	50
	51	extern void rand_initialize_irq(int irq);
	52
	53	extern void add_input_randomness(unsigned int type, unsigned int code,
	54	unsigned int value);
	55	extern void add_interrupt_randomness(int irq);
	56
	57	extern void get_random_bytes(void *buf, int nbytes);
	58	void generate_random_uuid(unsigned char uuid_out[16]);
	59
b09b845c AV	60	extern __u32 secure_ip_id(__be32 daddr);
	61	extern u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport);
	62	extern u32 secure_ipv6_port_ephemeral(const __be32 saddr, const __be32 daddr,
	63	__be16 dport);
	64	extern __u32 secure_tcp_sequence_number(__be32 saddr, __be32 daddr,
	65	__be16 sport, __be16 dport);
	66	extern __u32 secure_tcpv6_sequence_number(__be32 saddr, __be32 daddr,
	67	__be16 sport, __be16 dport);
	68	extern u64 secure_dccp_sequence_number(__be32 saddr, __be32 daddr,
	69	__be16 sport, __be16 dport);
1da177e4 LT	70
1da177e4 LT	71	#ifndef MODULE
54047320	72	extern const struct file_operations random_fops, urandom_fops;
1da177e4 LT	73	#endif
	74
	75	unsigned int get_random_int(void);
	76	unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len);
	77
aaa248f6 SH	78	u32 random32(void);
	79	void srandom32(u32 seed);
	80
5960164f JE	81	u32 prandom32(struct rnd_state *);
	82
	83	/*
	84	* Handle minimum values for seeds
	85	*/
	86	static inline u32 __seed(u32 x, u32 m)
	87	{
	88	return (x < m) ? x + m : x;
	89	}
	90
	91	/**
	92	* prandom32_seed - set seed for prandom32().
	93	* @state: pointer to state structure to receive the seed.
	94	* @seed: arbitrary 64-bit value to use as a seed.
	95	*/
	96	static inline void prandom32_seed(struct rnd_state *state, u64 seed)
	97	{
	98	u32 i = (seed >> 32) ^ (seed << 10) ^ seed;
	99
	100	state->s1 = __seed(i, 1);
	101	state->s2 = __seed(i, 7);
	102	state->s3 = __seed(i, 15);
	103	}
	104
1da177e4 LT	105	#endif /* __KERNEL___ */
	106
	107	#endif /* _LINUX_RANDOM_H */