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