randomdev_soft.h

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    1 /*-
    2  * Copyright (c) 2000-2004 Mark R V Murray
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer
   10  *    in this position and unchanged.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/8.4/sys/dev/random/randomdev_soft.h 153575 2005-12-20 21:41:52Z ps $
   27  */
   28 
   29 /* This header contains only those definitions that are global
   30  * and harvester-specific for the entropy processor
   31  */
   32 
   33 /* #define ENTROPYSOURCE nn        entropy sources (actually classes)
   34  *                                      This is properly defined in
   35  *                                      an enum in sys/random.h
   36  */
   37 
   38 /* Cryptographic block size in bits */
   39 #define BLOCKSIZE       256
   40 
   41 /* The ring size _MUST_ be a power of 2 */
   42 #define HARVEST_RING_SIZE       1024    /* harvest ring buffer size */
   43 #define HARVEST_RING_MASK       (HARVEST_RING_SIZE - 1)
   44 
   45 #define HARVESTSIZE     16      /* max size of each harvested entropy unit */
   46 
   47 MALLOC_DECLARE(M_ENTROPY);
   48 
   49 /* These are used to queue harvested packets of entropy. The entropy
   50  * buffer size is pretty arbitrary.
   51  */
   52 struct harvest {
   53         uintmax_t somecounter;          /* fast counter for clock jitter */
   54         u_char entropy[HARVESTSIZE];    /* the harvested entropy */
   55         u_int size, bits, frac;         /* stats about the entropy */
   56         enum esource source;            /* stats about the entropy */
   57         STAILQ_ENTRY(harvest) next;     /* next item on the list */
   58 };
   59 
   60 void random_yarrow_init(void);
   61 void random_yarrow_deinit(void);
   62 
   63 int random_yarrow_read(void *, int);
   64 void random_yarrow_write(void *, int);
   65 
   66 void random_yarrow_init_harvester(void (*)(u_int64_t, const void *, u_int,
   67         u_int, u_int, enum esource), int (*)(void *, int));
   68 void random_yarrow_deinit_harvester(void);
   69 
   70 void random_set_wakeup_exit(void *);
   71 void random_process_event(struct harvest *event);
   72 void random_yarrow_reseed(void);
   73 void random_yarrow_unblock(void);
   74 
   75 void random_yarrow_init_alg(struct sysctl_ctx_list *, struct sysctl_oid *);
   76 void random_yarrow_deinit_alg(void);
   77 
   78 extern struct random_systat random_yarrow;
   79 extern struct mtx random_reseed_mtx;
   80 
   81 /* If this was c++, this would be a template */
   82 #define RANDOM_CHECK_UINT(name, min, max)                               \
   83 static int                                                              \
   84 random_check_uint_##name(SYSCTL_HANDLER_ARGS)                           \
   85 {                                                                       \
   86         if (oidp->oid_arg1 != NULL) {                                   \
   87                  if (*(u_int *)(oidp->oid_arg1) <= (min))               \
   88                         *(u_int *)(oidp->oid_arg1) = (min);             \
   89                  else if (*(u_int *)(oidp->oid_arg1) > (max))           \
   90                         *(u_int *)(oidp->oid_arg1) = (max);             \
   91         }                                                               \
   92         return sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,  \
   93                 req);                                                   \
   94 }

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

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