FreeBSD/Linux Kernel Cross Reference
sys/sys/random.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2000-2015, 2017 Mark R. V. Murray
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer
     *    in this position and unchanged.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * $FreeBSD: releng/12.0/sys/sys/random.h 338324 2018-08-26 12:51:46Z markm $
     */
    
    #ifndef _SYS_RANDOM_H_
    #define _SYS_RANDOM_H_
    
    #include <sys/types.h>
    
    #ifdef _KERNEL
    
    struct uio;
    
    #if defined(DEV_RANDOM)
    u_int read_random(void *, u_int);
    int read_random_uio(struct uio *, bool);
    #else
    static __inline int
    read_random_uio(void *a __unused, u_int b __unused)
    {
            return (0);
    }
    static __inline u_int
    read_random(void *a __unused, u_int b __unused)
    {
            return (0);
    }
    #endif
    
    /*
     * Note: if you add or remove members of random_entropy_source, remember to
     * also update the strings in the static array random_source_descr[] in
     * random_harvestq.c.
     *
     * NOTE: complain loudly to markm@ or on the lists if this enum gets more than 32
     * distinct values (0-31)! ENTROPYSOURCE may be == 32, but not > 32.
     */
    enum random_entropy_source {
            RANDOM_START = 0,
            RANDOM_CACHED = 0,
            /* Environmental sources */
            RANDOM_ATTACH,
            RANDOM_KEYBOARD,
            RANDOM_MOUSE,
            RANDOM_NET_TUN,
            RANDOM_NET_ETHER,
            RANDOM_NET_NG,
            RANDOM_INTERRUPT,
            RANDOM_SWI,
            RANDOM_FS_ATIME,
            RANDOM_UMA,     /* Special!! UMA/SLAB Allocator */
            RANDOM_ENVIRONMENTAL_END = RANDOM_UMA,
            /* Fast hardware random-number sources from here on. */
            RANDOM_PURE_START,
            RANDOM_PURE_OCTEON = RANDOM_PURE_START,
            RANDOM_PURE_SAFE,
            RANDOM_PURE_GLXSB,
            RANDOM_PURE_UBSEC,
            RANDOM_PURE_HIFN,
            RANDOM_PURE_RDRAND,
            RANDOM_PURE_NEHEMIAH,
            RANDOM_PURE_RNDTEST,
            RANDOM_PURE_VIRTIO,
            RANDOM_PURE_BROADCOM,
            RANDOM_PURE_CCP,
            RANDOM_PURE_DARN,
            ENTROPYSOURCE
    };
    
    #define RANDOM_HARVEST_EVERYTHING_MASK ((1 << (RANDOM_ENVIRONMENTAL_END + 1)) - 1)
    #define RANDOM_HARVEST_PURE_MASK (((1 << ENTROPYSOURCE) - 1) & (-1UL << RANDOM_PURE_START))
    
    #define RANDOM_LEGACY_BOOT_ENTROPY_MODULE       "/boot/entropy"
   #define RANDOM_CACHED_BOOT_ENTROPY_MODULE       "boot_entropy_cache"
   #define RANDOM_CACHED_SKIP_START        256
   
   #if defined(DEV_RANDOM)
   extern u_int hc_source_mask;
   void random_harvest_queue_(const void *, u_int, enum random_entropy_source);
   void random_harvest_fast_(const void *, u_int);
   void random_harvest_direct_(const void *, u_int, enum random_entropy_source);
   
   static __inline void
   random_harvest_queue(const void *entropy, u_int size, enum random_entropy_source origin)
   {
   
           if (hc_source_mask & (1 << origin))
                   random_harvest_queue_(entropy, size, origin);
   }
   
   static __inline void
   random_harvest_fast(const void *entropy, u_int size, enum random_entropy_source origin)
   {
   
           if (hc_source_mask & (1 << origin))
                   random_harvest_fast_(entropy, size);
   }
   
   static __inline void
   random_harvest_direct(const void *entropy, u_int size, enum random_entropy_source origin)
   {
   
           if (hc_source_mask & (1 << origin))
                   random_harvest_direct_(entropy, size, origin);
   }
   
   void random_harvest_register_source(enum random_entropy_source);
   void random_harvest_deregister_source(enum random_entropy_source);
   #else
   #define random_harvest_queue(a, b, c) do {} while (0)
   #define random_harvest_fast(a, b, c) do {} while (0)
   #define random_harvest_direct(a, b, c) do {} while (0)
   #define random_harvest_register_source(a) do {} while (0)
   #define random_harvest_deregister_source(a) do {} while (0)
   #endif
   
   #if defined(RANDOM_ENABLE_UMA)
   #define random_harvest_fast_uma(a, b, c)        random_harvest_fast(a, b, c)
   #else /* !defined(RANDOM_ENABLE_UMA) */
   #define random_harvest_fast_uma(a, b, c)        do {} while (0)
   #endif /* defined(RANDOM_ENABLE_UMA) */
   
   #if defined(RANDOM_ENABLE_ETHER)
   #define random_harvest_queue_ether(a, b)        random_harvest_queue(a, b, RANDOM_NET_ETHER)
   #else /* !defined(RANDOM_ENABLE_ETHER) */
   #define random_harvest_queue_ether(a, b)        do {} while (0)
   #endif /* defined(RANDOM_ENABLE_ETHER) */
   
   
   #endif /* _KERNEL */
   
   #define GRND_NONBLOCK   0x1
   #define GRND_RANDOM     0x2
   ssize_t getrandom(void *buf, size_t buflen, unsigned int flags);
   
   #endif /* _SYS_RANDOM_H_ */

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