1 /*- 2 * Copyright (c) 2002 Poul-Henning Kamp 3 * Copyright (c) 2002 Networks Associates Technology, Inc. 4 * All rights reserved. 5 * 6 * This software was developed for the FreeBSD Project by Poul-Henning Kamp 7 * and NAI Labs, the Security Research Division of Network Associates, Inc. 8 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 9 * DARPA CHATS research program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. The names of the authors may not be used to endorse or promote 20 * products derived from this software without specific prior written 21 * permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * $FreeBSD$ 36 */ 37 38 #include "opt_geom.h" 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/kernel.h> 43 #include <sys/sysctl.h> 44 #include <sys/bio.h> 45 #include <sys/conf.h> 46 #include <sys/disk.h> 47 #include <sys/malloc.h> 48 #include <sys/sysctl.h> 49 #include <sys/stdint.h> 50 51 #include <sys/lock.h> 52 #include <sys/mutex.h> 53 #include <geom/geom.h> 54 #include <geom/geom_int.h> 55 56 static g_access_t g_ctl_access; 57 static g_start_t g_ctl_start; 58 static void g_ctl_init(void); 59 static d_ioctl_t g_ctl_ioctl; 60 61 struct g_class g_ctl_class = { 62 "GEOMCTL", 63 NULL, 64 NULL, 65 G_CLASS_INITIALIZER 66 }; 67 68 DECLARE_GEOM_CLASS_INIT(g_ctl_class, g_ctl, g_ctl_init); 69 70 /* 71 * We cannot do create our geom.ctl geom/provider in g_ctl_init() because 72 * the event thread has to finish adding our class first and that doesn't 73 * happen until later. We know however, that the events are processed in 74 * FIFO order, so scheduling g_ctl_init2() with g_call_me() is safe. 75 */ 76 77 static void 78 g_ctl_init2(void *p __unused) 79 { 80 struct g_geom *gp; 81 struct g_provider *pp; 82 83 g_topology_assert(); 84 gp = g_new_geomf(&g_ctl_class, "geom.ctl"); 85 gp->start = g_ctl_start; 86 gp->access = g_ctl_access; 87 pp = g_new_providerf(gp, "%s", gp->name); 88 pp->sectorsize = 512; 89 g_error_provider(pp, 0); 90 } 91 92 static void 93 g_ctl_init(void) 94 { 95 mtx_unlock(&Giant); 96 g_add_class(&g_ctl_class); 97 g_call_me(g_ctl_init2, NULL); 98 mtx_lock(&Giant); 99 } 100 101 /* 102 * We allow any kind of access. Access control is handled at the devfs 103 * level. 104 */ 105 106 static int 107 g_ctl_access(struct g_provider *pp, int r, int w, int e) 108 { 109 int error; 110 111 g_trace(G_T_ACCESS, "g_ctl_access(%s, %d, %d, %d)", 112 pp->name, r, w, e); 113 114 g_topology_assert(); 115 error = 0; 116 return (error); 117 } 118 119 static void 120 g_ctl_start(struct bio *bp) 121 { 122 struct g_ioctl *gio; 123 int error; 124 125 switch(bp->bio_cmd) { 126 case BIO_DELETE: 127 case BIO_READ: 128 case BIO_WRITE: 129 error = EOPNOTSUPP; 130 break; 131 case BIO_GETATTR: 132 case BIO_SETATTR: 133 if (strcmp(bp->bio_attribute, "GEOM::ioctl") || 134 bp->bio_length != sizeof *gio) { 135 error = EOPNOTSUPP; 136 break; 137 } 138 gio = (struct g_ioctl *)bp->bio_data; 139 gio->func = g_ctl_ioctl; 140 error = EDIRIOCTL; 141 break; 142 default: 143 error = EOPNOTSUPP; 144 break; 145 } 146 g_io_deliver(bp, error); 147 return; 148 } 149 150 /* 151 * All the stuff above is really just needed to get to the stuff below 152 */ 153 154 static int 155 g_ctl_ioctl_configgeom(dev_t dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 156 { 157 struct geomconfiggeom *gcp; 158 struct g_configargs ga; 159 int error; 160 161 error = 0; 162 bzero(&ga, sizeof ga); 163 gcp = (struct geomconfiggeom *)data; 164 ga.class = g_idclass(&gcp->class); 165 if (ga.class == NULL) 166 return (EINVAL); 167 if (ga.class->config == NULL) 168 return (EOPNOTSUPP); 169 ga.geom = g_idgeom(&gcp->geom); 170 ga.provider = g_idprovider(&gcp->provider); 171 ga.len = gcp->len; 172 if (gcp->len > 64 * 1024) 173 return (EINVAL); 174 else if (gcp->len == 0) { 175 ga.ptr = NULL; 176 } else { 177 ga.ptr = g_malloc(gcp->len, 0); 178 error = copyin(gcp->ptr, ga.ptr, gcp->len); 179 if (error) { 180 g_free(ga.ptr); 181 return (error); 182 } 183 } 184 ga.flag = gcp->flag; 185 error = ga.class->config(&ga); 186 if (gcp->len != 0) 187 copyout(ga.ptr, gcp->ptr, gcp->len); /* Ignore error */ 188 gcp->class.u.id = (uintptr_t)ga.class; 189 gcp->class.len = 0; 190 gcp->geom.u.id = (uintptr_t)ga.geom; 191 gcp->geom.len = 0; 192 gcp->provider.u.id = (uintptr_t)ga.provider; 193 gcp->provider.len = 0; 194 return(error); 195 } 196 197 static int 198 g_ctl_ioctl(dev_t dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 199 { 200 int error; 201 202 DROP_GIANT(); 203 g_topology_lock(); 204 switch(cmd) { 205 case GEOMCONFIGGEOM: 206 error = g_ctl_ioctl_configgeom(dev, cmd, data, fflag, td); 207 break; 208 default: 209 error = ENOTTY; 210 break; 211 } 212 g_topology_unlock(); 213 PICKUP_GIANT(); 214 return (error); 215 216 } 217