1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1994 Christos Zoulas 5 * Copyright (c) 1995 Frank van der Linden 6 * Copyright (c) 1995 Scott Bartram 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 * 31 * from: svr4_util.c,v 1.5 1995/01/22 23:44:50 christos Exp 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include <sys/param.h> 38 #include <sys/types.h> 39 #include <sys/bus.h> 40 #include <sys/conf.h> 41 #include <sys/fcntl.h> 42 #include <sys/jail.h> 43 #include <sys/malloc.h> 44 #include <sys/namei.h> 45 #include <sys/proc.h> 46 #include <sys/stat.h> 47 #include <sys/syscallsubr.h> 48 #include <sys/vnode.h> 49 50 #include <machine/stdarg.h> 51 52 #include <compat/linux/linux_dtrace.h> 53 #include <compat/linux/linux_mib.h> 54 #include <compat/linux/linux_util.h> 55 56 MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures"); 57 MALLOC_DEFINE(M_EPOLL, "lepoll", "Linux events structures"); 58 59 FEATURE(linuxulator_v4l, "V4L ioctl wrapper support in the linuxulator"); 60 FEATURE(linuxulator_v4l2, "V4L2 ioctl wrapper support in the linuxulator"); 61 62 /** 63 * Special DTrace provider for the linuxulator. 64 * 65 * In this file we define the provider for the entire linuxulator. All 66 * modules (= files of the linuxulator) use it. 67 * 68 * We define a different name depending on the emulated bitsize, see 69 * ../../<ARCH>/linux{,32}/linux.h, e.g.: 70 * native bitsize = linuxulator 71 * amd64, 32bit emulation = linuxulator32 72 */ 73 LIN_SDT_PROVIDER_DEFINE(linuxulator); 74 LIN_SDT_PROVIDER_DEFINE(linuxulator32); 75 76 char linux_emul_path[MAXPATHLEN] = "/compat/linux"; 77 78 SYSCTL_STRING(_compat_linux, OID_AUTO, emul_path, CTLFLAG_RWTUN, 79 linux_emul_path, sizeof(linux_emul_path), 80 "Linux runtime environment path"); 81 82 /* 83 * Search an alternate path before passing pathname arguments on to 84 * system calls. Useful for keeping a separate 'emulation tree'. 85 * 86 * If cflag is set, we check if an attempt can be made to create the 87 * named file, i.e. we check if the directory it should be in exists. 88 */ 89 int 90 linux_emul_convpath(const char *path, enum uio_seg pathseg, 91 char **pbuf, int cflag, int dfd) 92 { 93 int retval; 94 95 retval = kern_alternate_path(linux_emul_path, path, pathseg, pbuf, 96 cflag, dfd); 97 98 return (retval); 99 } 100 101 void 102 linux_msg(const struct thread *td, const char *fmt, ...) 103 { 104 va_list ap; 105 struct proc *p; 106 107 if (linux_debug == 0) 108 return; 109 110 p = td->td_proc; 111 printf("linux: jid %d pid %d (%s): ", p->p_ucred->cr_prison->pr_id, 112 (int)p->p_pid, p->p_comm); 113 va_start(ap, fmt); 114 vprintf(fmt, ap); 115 va_end(ap); 116 printf("\n"); 117 } 118 119 struct device_element 120 { 121 TAILQ_ENTRY(device_element) list; 122 struct linux_device_handler entry; 123 }; 124 125 static TAILQ_HEAD(, device_element) devices = 126 TAILQ_HEAD_INITIALIZER(devices); 127 128 static struct linux_device_handler null_handler = 129 { "mem", "mem", "null", "null", 1, 3, 1}; 130 131 DATA_SET(linux_device_handler_set, null_handler); 132 133 char * 134 linux_driver_get_name_dev(device_t dev) 135 { 136 struct device_element *de; 137 const char *device_name = device_get_name(dev); 138 139 if (device_name == NULL) 140 return (NULL); 141 TAILQ_FOREACH(de, &devices, list) { 142 if (strcmp(device_name, de->entry.bsd_driver_name) == 0) 143 return (de->entry.linux_driver_name); 144 } 145 146 return (NULL); 147 } 148 149 int 150 linux_driver_get_major_minor(const char *node, int *major, int *minor) 151 { 152 struct device_element *de; 153 unsigned long devno; 154 size_t sz; 155 156 if (node == NULL || major == NULL || minor == NULL) 157 return (1); 158 159 sz = sizeof("pts/") - 1; 160 if (strncmp(node, "pts/", sz) == 0 && node[sz] != '\0') { 161 /* 162 * Linux checks major and minors of the slave device 163 * to make sure it's a pty device, so let's make him 164 * believe it is. 165 */ 166 devno = strtoul(node + sz, NULL, 10); 167 *major = 136 + (devno / 256); 168 *minor = devno % 256; 169 return (0); 170 } 171 172 sz = sizeof("dri/card") - 1; 173 if (strncmp(node, "dri/card", sz) == 0 && node[sz] != '\0') { 174 devno = strtoul(node + sz, NULL, 10); 175 *major = 226 + (devno / 256); 176 *minor = devno % 256; 177 return (0); 178 } 179 sz = sizeof("dri/controlD") - 1; 180 if (strncmp(node, "dri/controlD", sz) == 0 && node[sz] != '\0') { 181 devno = strtoul(node + sz, NULL, 10); 182 *major = 226 + (devno / 256); 183 *minor = devno % 256; 184 return (0); 185 } 186 sz = sizeof("dri/renderD") - 1; 187 if (strncmp(node, "dri/renderD", sz) == 0 && node[sz] != '\0') { 188 devno = strtoul(node + sz, NULL, 10); 189 *major = 226 + (devno / 256); 190 *minor = devno % 256; 191 return (0); 192 } 193 sz = sizeof("drm/") - 1; 194 if (strncmp(node, "drm/", sz) == 0 && node[sz] != '\0') { 195 devno = strtoul(node + sz, NULL, 10); 196 *major = 226 + (devno / 256); 197 *minor = devno % 256; 198 return (0); 199 } 200 201 TAILQ_FOREACH(de, &devices, list) { 202 if (strcmp(node, de->entry.bsd_device_name) == 0) { 203 *major = de->entry.linux_major; 204 *minor = de->entry.linux_minor; 205 return (0); 206 } 207 } 208 209 return (1); 210 } 211 212 int 213 linux_vn_get_major_minor(const struct vnode *vp, int *major, int *minor) 214 { 215 int error; 216 217 if (vp->v_type != VCHR) 218 return (ENOTBLK); 219 dev_lock(); 220 if (vp->v_rdev == NULL) { 221 dev_unlock(); 222 return (ENXIO); 223 } 224 error = linux_driver_get_major_minor(devtoname(vp->v_rdev), 225 major, minor); 226 dev_unlock(); 227 return (error); 228 } 229 230 void 231 translate_vnhook_major_minor(struct vnode *vp, struct stat *sb) 232 { 233 int major, minor; 234 235 if (vn_isdisk(vp)) { 236 sb->st_mode &= ~S_IFMT; 237 sb->st_mode |= S_IFBLK; 238 } 239 240 /* 241 * Return the same st_dev for every devfs instance. The reason 242 * for this is to work around an idiosyncrasy of glibc getttynam() 243 * implementation: it checks whether st_dev returned for fd 0 244 * is the same as st_dev returned for the target of /proc/self/fd/0 245 * symlink, and with linux chroots having their own devfs instance, 246 * the check will fail if you chroot into it. 247 */ 248 if (rootdevmp != NULL && vp->v_mount->mnt_vfc == rootdevmp->mnt_vfc) 249 sb->st_dev = rootdevmp->mnt_stat.f_fsid.val[0]; 250 251 if (linux_vn_get_major_minor(vp, &major, &minor) == 0) 252 sb->st_rdev = makedev(major, minor); 253 } 254 255 char * 256 linux_get_char_devices(void) 257 { 258 struct device_element *de; 259 char *temp, *string, *last; 260 char formated[256]; 261 int current_size = 0, string_size = 1024; 262 263 string = malloc(string_size, M_LINUX, M_WAITOK); 264 string[0] = '\000'; 265 last = ""; 266 TAILQ_FOREACH(de, &devices, list) { 267 if (!de->entry.linux_char_device) 268 continue; 269 temp = string; 270 if (strcmp(last, de->entry.bsd_driver_name) != 0) { 271 last = de->entry.bsd_driver_name; 272 273 snprintf(formated, sizeof(formated), "%3d %s\n", 274 de->entry.linux_major, 275 de->entry.linux_device_name); 276 if (strlen(formated) + current_size 277 >= string_size) { 278 string_size *= 2; 279 string = malloc(string_size, 280 M_LINUX, M_WAITOK); 281 bcopy(temp, string, current_size); 282 free(temp, M_LINUX); 283 } 284 strcat(string, formated); 285 current_size = strlen(string); 286 } 287 } 288 289 return (string); 290 } 291 292 void 293 linux_free_get_char_devices(char *string) 294 { 295 296 free(string, M_LINUX); 297 } 298 299 static int linux_major_starting = 200; 300 301 int 302 linux_device_register_handler(struct linux_device_handler *d) 303 { 304 struct device_element *de; 305 306 if (d == NULL) 307 return (EINVAL); 308 309 de = malloc(sizeof(*de), M_LINUX, M_WAITOK); 310 if (d->linux_major < 0) { 311 d->linux_major = linux_major_starting++; 312 } 313 bcopy(d, &de->entry, sizeof(*d)); 314 315 /* Add the element to the list, sorted on span. */ 316 TAILQ_INSERT_TAIL(&devices, de, list); 317 318 return (0); 319 } 320 321 int 322 linux_device_unregister_handler(struct linux_device_handler *d) 323 { 324 struct device_element *de; 325 326 if (d == NULL) 327 return (EINVAL); 328 329 TAILQ_FOREACH(de, &devices, list) { 330 if (bcmp(d, &de->entry, sizeof(*d)) == 0) { 331 TAILQ_REMOVE(&devices, de, list); 332 free(de, M_LINUX); 333 334 return (0); 335 } 336 } 337 338 return (EINVAL); 339 } 340