randomdev.c revision 62149
1/*- 2 * Copyright (c) 2000 Mark 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: head/sys/dev/random/randomdev.c 62149 2000-06-27 09:38:40Z markm $ 27 */ 28 29#include <sys/param.h> 30#include <sys/systm.h> 31#include <sys/conf.h> 32#include <sys/fcntl.h> 33#include <sys/uio.h> 34#include <sys/kernel.h> 35#include <sys/kobj.h> 36#include <sys/malloc.h> 37#include <sys/module.h> 38#include <sys/bus.h> 39#include <sys/random.h> 40#include <machine/bus.h> 41#include <machine/resource.h> 42#include <sys/rman.h> 43#include <sys/signalvar.h> 44#include <sys/sysctl.h> 45#include <crypto/blowfish/blowfish.h> 46 47#include <dev/randomdev/yarrow.h> 48 49static d_read_t randomread; 50static d_write_t randomwrite; 51 52#define CDEV_MAJOR 2 53#define RANDOM_MINOR 3 54#define URANDOM_MINOR 4 55 56static struct cdevsw random_cdevsw = { 57 /* open */ (d_open_t *)nullop, 58 /* close */ (d_close_t *)nullop, 59 /* read */ randomread, 60 /* write */ randomwrite, 61 /* ioctl */ noioctl, 62 /* poll */ nopoll, 63 /* mmap */ nommap, 64 /* strategy */ nostrategy, 65 /* name */ "random", 66 /* maj */ CDEV_MAJOR, 67 /* dump */ nodump, 68 /* psize */ nopsize, 69 /* flags */ 0, 70 /* bmaj */ -1 71}; 72 73/* For use with make_dev(9)/destroy_dev(9). */ 74static dev_t randomdev; 75static dev_t urandomdev; 76 77void *buf; 78 79extern void randominit(void); 80 81extern struct state state; 82 83/* This is mostly academic at the moment; as Yarrow gets extended, it will 84 become more relevant */ 85SYSCTL_NODE(_kern, OID_AUTO, random, CTLFLAG_RW, 0, "Random Number Generator"); 86SYSCTL_NODE(_kern_random, OID_AUTO, yarrow, CTLFLAG_RW, 0, "Yarrow Parameters"); 87SYSCTL_INT(_kern_random_yarrow, OID_AUTO, gengateinterval, CTLFLAG_RW, &state.gengateinterval, 10, "Generator Gate Interval"); 88 89static int 90randomread(dev_t dev, struct uio *uio, int flag) 91{ 92 u_int c, ret; 93 int error = 0; 94 95 c = min(uio->uio_resid, PAGE_SIZE); 96 buf = (void *)malloc(c, M_TEMP, M_WAITOK); 97 while (uio->uio_resid > 0 && error == 0) { 98 ret = read_random(buf, c); 99 error = uiomove(buf, ret, uio); 100 } 101 free(buf, M_TEMP); 102 return error; 103} 104 105static int 106randomwrite(dev_t dev, struct uio *uio, int flag) 107{ 108 u_int c; 109 int error = 0; 110 111 buf = (void *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK); 112 while (uio->uio_resid > 0) { 113 c = min(uio->uio_resid, PAGE_SIZE); 114 error = uiomove(buf, c, uio); 115 if (error) 116 break; 117 /* write_random(buf, c); */ 118 } 119 free(buf, M_TEMP); 120 return error; 121} 122 123static int 124random_modevent(module_t mod, int type, void *data) 125{ 126 switch(type) { 127 case MOD_LOAD: 128 if (bootverbose) 129 printf("random: <entropy source>\n"); 130 randomdev = make_dev(&random_cdevsw, RANDOM_MINOR, UID_ROOT, 131 GID_WHEEL, 0666, "random"); 132 urandomdev = make_dev(&random_cdevsw, URANDOM_MINOR, UID_ROOT, 133 GID_WHEEL, 0666, "urandom"); 134 randominit(); 135 return 0; 136 137 case MOD_UNLOAD: 138 destroy_dev(randomdev); 139 destroy_dev(urandomdev); 140 return 0; 141 142 case MOD_SHUTDOWN: 143 return 0; 144 145 default: 146 return EOPNOTSUPP; 147 } 148} 149 150DEV_MODULE(random, random_modevent, NULL); 151