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random.h (1896B) - Raw

      1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
      2 /*
      3  * include/linux/random.h
      4  *
      5  * Include file for the random number generator.
      6  */
      7 
      8 #ifndef _LINUX_RANDOM_H
      9 #define _LINUX_RANDOM_H
     10 
     11 #include <linux/types.h>
     12 #include <linux/ioctl.h>
     13 #include <linux/irqnr.h>
     14 
     15 /* ioctl()'s for the random number generator */
     16 
     17 /* Get the entropy count. */
     18 #define RNDGETENTCNT	_IOR( 'R', 0x00, int )
     19 
     20 /* Add to (or subtract from) the entropy count.  (Superuser only.) */
     21 #define RNDADDTOENTCNT	_IOW( 'R', 0x01, int )
     22 
     23 /* Get the contents of the entropy pool.  (Superuser only.) (Removed in 2.6.9-rc2.) */
     24 #define RNDGETPOOL	_IOR( 'R', 0x02, int [2] )
     25 
     26 /* 
     27  * Write bytes into the entropy pool and add to the entropy count.
     28  * (Superuser only.)
     29  */
     30 #define RNDADDENTROPY	_IOW( 'R', 0x03, int [2] )
     31 
     32 /* Clear entropy count to 0.  (Superuser only.) */
     33 #define RNDZAPENTCNT	_IO( 'R', 0x04 )
     34 
     35 /* Clear the entropy pool and associated counters.  (Superuser only.) */
     36 #define RNDCLEARPOOL	_IO( 'R', 0x06 )
     37 
     38 /* Reseed CRNG.  (Superuser only.) */
     39 #define RNDRESEEDCRNG	_IO( 'R', 0x07 )
     40 
     41 struct rand_pool_info {
     42 	int	entropy_count;
     43 	int	buf_size;
     44 	__u32	buf[];
     45 };
     46 
     47 /*
     48  * Flags for getrandom(2)
     49  *
     50  * GRND_NONBLOCK	Don't block and return EAGAIN instead
     51  * GRND_RANDOM		No effect
     52  * GRND_INSECURE	Return non-cryptographic random bytes
     53  */
     54 #define GRND_NONBLOCK	0x0001
     55 #define GRND_RANDOM	0x0002
     56 #define GRND_INSECURE	0x0004
     57 
     58 /**
     59  * struct vgetrandom_opaque_params - arguments for allocating memory for vgetrandom
     60  *
     61  * @size_per_opaque_state:	Size of each state that is to be passed to vgetrandom().
     62  * @mmap_prot:			Value of the prot argument in mmap(2).
     63  * @mmap_flags:			Value of the flags argument in mmap(2).
     64  * @reserved:			Reserved for future use.
     65  */
     66 struct vgetrandom_opaque_params {
     67 	__u32 size_of_opaque_state;
     68 	__u32 mmap_prot;
     69 	__u32 mmap_flags;
     70 	__u32 reserved[13];
     71 };
     72 
     73 #endif /* _LINUX_RANDOM_H */