bio.c revision 1.2
1 /* $NetBSD: bio.c,v 1.2 2007/11/02 08:38:37 xtraeme Exp $ */ 2 /* $OpenBSD: bio.c,v 1.9 2007/03/20 02:35:55 marco Exp $ */ 3 4 /* 5 * Copyright (c) 2002 Niklas Hallqvist. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 /* A device controller ioctl tunnelling device. */ 29 30 #include <sys/cdefs.h> 31 __KERNEL_RCSID(0, "$NetBSD: bio.c,v 1.2 2007/11/02 08:38:37 xtraeme Exp $"); 32 33 #include <sys/param.h> 34 #include <sys/conf.h> 35 #include <sys/device.h> 36 #include <sys/event.h> 37 #include <sys/ioctl.h> 38 #include <sys/malloc.h> 39 #include <sys/queue.h> 40 #include <sys/systm.h> 41 #include <sys/mutex.h> 42 #include <sys/proc.h> 43 #include <sys/kauth.h> 44 45 #include <dev/biovar.h> 46 47 struct bio_mapping { 48 LIST_ENTRY(bio_mapping) bm_link; 49 struct device *bm_dev; 50 int (*bm_ioctl)(struct device *, u_long, void *); 51 }; 52 53 LIST_HEAD(, bio_mapping) bios = LIST_HEAD_INITIALIZER(bios); 54 static kmutex_t bio_lock; 55 56 void bioattach(int); 57 int bioclose(dev_t, int, int, struct lwp *); 58 int bioioctl(dev_t, u_long, void *, int, struct lwp *); 59 int bioopen(dev_t, int, int, struct lwp *); 60 61 int bio_delegate_ioctl(struct bio_mapping *, u_long, void *); 62 struct bio_mapping *bio_lookup(char *); 63 int bio_validate(void *); 64 65 const struct cdevsw bio_cdevsw = { 66 bioopen, bioclose, noread, nowrite, bioioctl, 67 nostop, notty, nopoll, nommap, nokqfilter, 0 68 }; 69 70 71 void 72 bioattach(int nunits) 73 { 74 mutex_init(&bio_lock, MUTEX_DRIVER, IPL_BIO); 75 } 76 77 int 78 bioopen(dev_t dev, int flags, int mode, struct lwp *l) 79 { 80 return 0; 81 } 82 83 int 84 bioclose(dev_t dev, int flags, int mode, struct lwp *l) 85 { 86 return 0; 87 } 88 89 int 90 bioioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) 91 { 92 struct bio_locate *locate; 93 struct bio_common *common; 94 char name[16]; 95 int error; 96 97 switch(cmd) { 98 case BIOCLOCATE: 99 case BIOCINQ: 100 case BIOCDISK: 101 case BIOCVOL: 102 error = kauth_authorize_device_passthru(l->l_cred, dev, 103 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr); 104 if (error) 105 return error; 106 break; 107 case BIOCBLINK: 108 case BIOCSETSTATE: 109 error = kauth_authorize_device_passthru(l->l_cred, dev, 110 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr); 111 if (error) 112 return error; 113 break; 114 case BIOCALARM: { 115 struct bioc_alarm *alarm = (struct bioc_alarm *)addr; 116 switch (alarm->ba_opcode) { 117 case BIOC_SADISABLE: 118 case BIOC_SAENABLE: 119 case BIOC_SASILENCE: 120 case BIOC_SATEST: 121 error = kauth_authorize_device_passthru(l->l_cred, dev, 122 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr); 123 if (error) 124 return error; 125 break; 126 case BIOC_GASTATUS: 127 error = kauth_authorize_device_passthru(l->l_cred, dev, 128 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr); 129 if (error) 130 return error; 131 break; 132 default: 133 return EINVAL; 134 } 135 break; 136 } 137 default: 138 return ENOTTY; 139 } 140 141 switch (cmd) { 142 case BIOCLOCATE: 143 locate = (struct bio_locate *)addr; 144 error = copyinstr(locate->bl_name, name, 16, NULL); 145 if (error != 0) 146 return error; 147 locate->bl_cookie = bio_lookup(name); 148 if (locate->bl_cookie == NULL) 149 return ENOENT; 150 break; 151 152 default: 153 common = (struct bio_common *)addr; 154 mutex_enter(&bio_lock); 155 if (!bio_validate(common->bc_cookie)) { 156 mutex_exit(&bio_lock); 157 return ENOENT; 158 } 159 mutex_exit(&bio_lock); 160 error = bio_delegate_ioctl( 161 (struct bio_mapping *)common->bc_cookie, cmd, addr); 162 return error; 163 } 164 return 0; 165 } 166 167 int 168 bio_register(struct device *dev, int (*ioctl)(struct device *, u_long, void *)) 169 { 170 struct bio_mapping *bm; 171 172 bm = (struct bio_mapping *)malloc(sizeof(*bm), M_DEVBUF, 173 M_NOWAIT|M_ZERO); 174 if (bm == NULL) 175 return ENOMEM; 176 bm->bm_dev = dev; 177 bm->bm_ioctl = ioctl; 178 mutex_enter(&bio_lock); 179 LIST_INSERT_HEAD(&bios, bm, bm_link); 180 mutex_exit(&bio_lock); 181 return 0; 182 } 183 184 void 185 bio_unregister(struct device *dev) 186 { 187 struct bio_mapping *bm, *next; 188 189 mutex_enter(&bio_lock); 190 for (bm = LIST_FIRST(&bios); bm != NULL; bm = next) { 191 next = LIST_NEXT(bm, bm_link); 192 193 if (dev == bm->bm_dev) { 194 LIST_REMOVE(bm, bm_link); 195 free(bm, M_DEVBUF); 196 } 197 } 198 mutex_exit(&bio_lock); 199 } 200 201 struct bio_mapping * 202 bio_lookup(char *name) 203 { 204 struct bio_mapping *bm; 205 206 mutex_enter(&bio_lock); 207 LIST_FOREACH(bm, &bios, bm_link) { 208 if (strcmp(name, bm->bm_dev->dv_xname) == 0) { 209 mutex_exit(&bio_lock); 210 return bm; 211 } 212 } 213 mutex_exit(&bio_lock); 214 return NULL; 215 } 216 217 int 218 bio_validate(void *cookie) 219 { 220 struct bio_mapping *bm; 221 222 LIST_FOREACH(bm, &bios, bm_link) 223 if (bm == cookie) 224 return 1; 225 226 return 0; 227 } 228 229 int 230 bio_delegate_ioctl(struct bio_mapping *bm, u_long cmd, void *addr) 231 { 232 233 return bm->bm_ioctl(bm->bm_dev, cmd, addr); 234 } 235
Indexes created Sun Oct 12 22:09:51 GMT 2025