1 /*- 2 * Copyright (c) 2000 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 * $FreeBSD$ 27 */ 28 29 #include <sys/param.h> 30 #include <sys/queue.h> 31 #include <sys/systm.h> 32 #include <sys/conf.h> 33 #include <sys/fcntl.h> 34 #include <sys/uio.h> 35 #include <sys/kernel.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 49 static d_read_t random_read; 50 static d_write_t random_write; 51 52 #define CDEV_MAJOR 2 53 #define RANDOM_MINOR 3 54 #define URANDOM_MINOR 4 55 56 static struct cdevsw random_cdevsw = { 57 /* open */ (d_open_t *)nullop, 58 /* close */ (d_close_t *)nullop, 59 /* read */ random_read, 60 /* write */ random_write, 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). */ 74 static dev_t random_dev; 75 static dev_t urandom_dev; 76 77 SYSCTL_NODE(_kern, OID_AUTO, random, CTLFLAG_RW, 0, "Random Number Generator"); 78 SYSCTL_NODE(_kern_random, OID_AUTO, yarrow, CTLFLAG_RW, 0, "Yarrow Parameters"); 79 SYSCTL_INT(_kern_random_yarrow, OID_AUTO, gengateinterval, CTLFLAG_RW, 80 &random_state.gengateinterval, 10, "Generator Gate Interval"); 81 SYSCTL_INT(_kern_random_yarrow, OID_AUTO, bins, CTLFLAG_RW, 82 &random_state.bins, 10, "Execution time tuner"); 83 SYSCTL_INT(_kern_random_yarrow, OID_AUTO, fastthresh, CTLFLAG_RW, 84 &random_state.pool[0].thresh, 100, "Fast pool reseed threshhold"); 85 SYSCTL_INT(_kern_random_yarrow, OID_AUTO, slowthresh, CTLFLAG_RW, 86 &random_state.pool[1].thresh, 100, "Slow pool reseed threshhold"); 87 SYSCTL_INT(_kern_random_yarrow, OID_AUTO, slowoverthresh, CTLFLAG_RW, 88 &random_state.slowoverthresh, 2, "Slow pool over-threshhold reseed"); 89 90 static int 91 random_read(dev_t dev, struct uio *uio, int flag) 92 { 93 u_int c, ret; 94 int error = 0; 95 void *random_buf; 96 97 c = min(uio->uio_resid, PAGE_SIZE); 98 random_buf = (void *)malloc(c, M_TEMP, M_WAITOK); 99 while (uio->uio_resid > 0 && error == 0) { 100 ret = read_random(random_buf, c); 101 error = uiomove(random_buf, ret, uio); 102 } 103 free(random_buf, M_TEMP); 104 return error; 105 } 106 107 static int 108 random_write(dev_t dev, struct uio *uio, int flag) 109 { 110 u_int c; 111 int error = 0; 112 void *random_buf; 113 114 random_buf = (void *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK); 115 while (uio->uio_resid > 0) { 116 c = min(uio->uio_resid, PAGE_SIZE); 117 error = uiomove(random_buf, c, uio); 118 if (error) 119 break; 120 /* write_random(random_buf, c); */ 121 } 122 free(random_buf, M_TEMP); 123 return error; 124 } 125 126 static int 127 random_modevent(module_t mod, int type, void *data) 128 { 129 switch(type) { 130 case MOD_LOAD: 131 if (bootverbose) 132 printf("random: <entropy source>\n"); 133 random_dev = make_dev(&random_cdevsw, RANDOM_MINOR, UID_ROOT, 134 GID_WHEEL, 0666, "random"); 135 urandom_dev = make_dev(&random_cdevsw, URANDOM_MINOR, UID_ROOT, 136 GID_WHEEL, 0666, "urandom"); 137 random_init(); 138 return 0; 139 140 case MOD_UNLOAD: 141 random_deinit(); 142 destroy_dev(random_dev); 143 destroy_dev(urandom_dev); 144 return 0; 145 146 case MOD_SHUTDOWN: 147 return 0; 148 149 default: 150 return EOPNOTSUPP; 151 } 152 } 153 154 DEV_MODULE(random, random_modevent, NULL); 155