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/bus.h> 39 #include <sys/conf.h> 40 #include <sys/fcntl.h> 41 #include <sys/jail.h> 42 #include <sys/malloc.h> 43 #include <sys/kernel.h> 44 #include <sys/linker_set.h> 45 #include <sys/namei.h> 46 #include <sys/proc.h> 47 #include <sys/sdt.h> 48 #include <sys/syscallsubr.h> 49 #include <sys/sysctl.h> 50 #include <sys/systm.h> 51 #include <sys/vnode.h> 52 53 #include <net/if.h> 54 #include <net/if_var.h> 55 #include <net/if_types.h> 56 57 #include <machine/stdarg.h> 58 59 #include <compat/linux/linux_dtrace.h> 60 #include <compat/linux/linux_mib.h> 61 #include <compat/linux/linux_util.h> 62 63 MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures"); 64 MALLOC_DEFINE(M_EPOLL, "lepoll", "Linux events structures"); 65 66 FEATURE(linuxulator_v4l, "V4L ioctl wrapper support in the linuxulator"); 67 FEATURE(linuxulator_v4l2, "V4L2 ioctl wrapper support in the linuxulator"); 68 69 /** 70 * Special DTrace provider for the linuxulator. 71 * 72 * In this file we define the provider for the entire linuxulator. All 73 * modules (= files of the linuxulator) use it. 74 * 75 * We define a different name depending on the emulated bitsize, see 76 * ../../<ARCH>/linux{,32}/linux.h, e.g.: 77 * native bitsize = linuxulator 78 * amd64, 32bit emulation = linuxulator32 79 */ 80 LIN_SDT_PROVIDER_DEFINE(linuxulator); 81 LIN_SDT_PROVIDER_DEFINE(linuxulator32); 82 83 char linux_emul_path[MAXPATHLEN] = "/compat/linux"; 84 85 SYSCTL_STRING(_compat_linux, OID_AUTO, emul_path, CTLFLAG_RWTUN, 86 linux_emul_path, sizeof(linux_emul_path), 87 "Linux runtime environment path"); 88 89 static bool use_real_ifnames = false; 90 SYSCTL_BOOL(_compat_linux, OID_AUTO, use_real_ifnames, CTLFLAG_RWTUN, 91 &use_real_ifnames, 0, 92 "Use FreeBSD interface names instead of generating ethN aliases"); 93 94 /* 95 * Search an alternate path before passing pathname arguments on to 96 * system calls. Useful for keeping a separate 'emulation tree'. 97 * 98 * If cflag is set, we check if an attempt can be made to create the 99 * named file, i.e. we check if the directory it should be in exists. 100 */ 101 int 102 linux_emul_convpath(const char *path, enum uio_seg pathseg, 103 char **pbuf, int cflag, int dfd) 104 { 105 int retval; 106 107 retval = kern_alternate_path(linux_emul_path, path, pathseg, pbuf, 108 cflag, dfd); 109 110 return (retval); 111 } 112 113 void 114 linux_msg(const struct thread *td, const char *fmt, ...) 115 { 116 va_list ap; 117 struct proc *p; 118 119 if (linux_debug == 0) 120 return; 121 122 p = td->td_proc; 123 printf("linux: jid %d pid %d (%s): ", p->p_ucred->cr_prison->pr_id, 124 (int)p->p_pid, p->p_comm); 125 va_start(ap, fmt); 126 vprintf(fmt, ap); 127 va_end(ap); 128 printf("\n"); 129 } 130 131 struct device_element 132 { 133 TAILQ_ENTRY(device_element) list; 134 struct linux_device_handler entry; 135 }; 136 137 static TAILQ_HEAD(, device_element) devices = 138 TAILQ_HEAD_INITIALIZER(devices); 139 140 static struct linux_device_handler null_handler = 141 { "mem", "mem", "null", "null", 1, 3, 1}; 142 143 DATA_SET(linux_device_handler_set, null_handler); 144 145 char * 146 linux_driver_get_name_dev(device_t dev) 147 { 148 struct device_element *de; 149 const char *device_name = device_get_name(dev); 150 151 if (device_name == NULL) 152 return (NULL); 153 TAILQ_FOREACH(de, &devices, list) { 154 if (strcmp(device_name, de->entry.bsd_driver_name) == 0) 155 return (de->entry.linux_driver_name); 156 } 157 158 return (NULL); 159 } 160 161 int 162 linux_driver_get_major_minor(const char *node, int *major, int *minor) 163 { 164 struct device_element *de; 165 unsigned long devno; 166 size_t sz; 167 168 if (node == NULL || major == NULL || minor == NULL) 169 return (1); 170 171 sz = sizeof("pts/") - 1; 172 if (strncmp(node, "pts/", sz) == 0 && node[sz] != '\0') { 173 /* 174 * Linux checks major and minors of the slave device 175 * to make sure it's a pty device, so let's make him 176 * believe it is. 177 */ 178 devno = strtoul(node + sz, NULL, 10); 179 *major = 136 + (devno / 256); 180 *minor = devno % 256; 181 return (0); 182 } 183 184 sz = sizeof("dri/card") - 1; 185 if (strncmp(node, "dri/card", sz) == 0 && node[sz] != '\0') { 186 devno = strtoul(node + sz, NULL, 10); 187 *major = 226 + (devno / 256); 188 *minor = devno % 256; 189 return (0); 190 } 191 sz = sizeof("dri/controlD") - 1; 192 if (strncmp(node, "dri/controlD", sz) == 0 && node[sz] != '\0') { 193 devno = strtoul(node + sz, NULL, 10); 194 *major = 226 + (devno / 256); 195 *minor = devno % 256; 196 return (0); 197 } 198 sz = sizeof("dri/renderD") - 1; 199 if (strncmp(node, "dri/renderD", sz) == 0 && node[sz] != '\0') { 200 devno = strtoul(node + sz, NULL, 10); 201 *major = 226 + (devno / 256); 202 *minor = devno % 256; 203 return (0); 204 } 205 sz = sizeof("drm/") - 1; 206 if (strncmp(node, "drm/", sz) == 0 && node[sz] != '\0') { 207 devno = strtoul(node + sz, NULL, 10); 208 *major = 226 + (devno / 256); 209 *minor = devno % 256; 210 return (0); 211 } 212 213 TAILQ_FOREACH(de, &devices, list) { 214 if (strcmp(node, de->entry.bsd_device_name) == 0) { 215 *major = de->entry.linux_major; 216 *minor = de->entry.linux_minor; 217 return (0); 218 } 219 } 220 221 return (1); 222 } 223 224 int 225 linux_vn_get_major_minor(const struct vnode *vp, int *major, int *minor) 226 { 227 int error; 228 229 if (vp->v_type != VCHR) 230 return (ENOTBLK); 231 dev_lock(); 232 if (vp->v_rdev == NULL) { 233 dev_unlock(); 234 return (ENXIO); 235 } 236 error = linux_driver_get_major_minor(devtoname(vp->v_rdev), 237 major, minor); 238 dev_unlock(); 239 return (error); 240 } 241 242 char * 243 linux_get_char_devices(void) 244 { 245 struct device_element *de; 246 char *temp, *string, *last; 247 char formated[256]; 248 int current_size = 0, string_size = 1024; 249 250 string = malloc(string_size, M_LINUX, M_WAITOK); 251 string[0] = '\000'; 252 last = ""; 253 TAILQ_FOREACH(de, &devices, list) { 254 if (!de->entry.linux_char_device) 255 continue; 256 temp = string; 257 if (strcmp(last, de->entry.bsd_driver_name) != 0) { 258 last = de->entry.bsd_driver_name; 259 260 snprintf(formated, sizeof(formated), "%3d %s\n", 261 de->entry.linux_major, 262 de->entry.linux_device_name); 263 if (strlen(formated) + current_size 264 >= string_size) { 265 string_size *= 2; 266 string = malloc(string_size, 267 M_LINUX, M_WAITOK); 268 bcopy(temp, string, current_size); 269 free(temp, M_LINUX); 270 } 271 strcat(string, formated); 272 current_size = strlen(string); 273 } 274 } 275 276 return (string); 277 } 278 279 void 280 linux_free_get_char_devices(char *string) 281 { 282 283 free(string, M_LINUX); 284 } 285 286 static int linux_major_starting = 200; 287 288 int 289 linux_device_register_handler(struct linux_device_handler *d) 290 { 291 struct device_element *de; 292 293 if (d == NULL) 294 return (EINVAL); 295 296 de = malloc(sizeof(*de), M_LINUX, M_WAITOK); 297 if (d->linux_major < 0) { 298 d->linux_major = linux_major_starting++; 299 } 300 bcopy(d, &de->entry, sizeof(*d)); 301 302 /* Add the element to the list, sorted on span. */ 303 TAILQ_INSERT_TAIL(&devices, de, list); 304 305 return (0); 306 } 307 308 int 309 linux_device_unregister_handler(struct linux_device_handler *d) 310 { 311 struct device_element *de; 312 313 if (d == NULL) 314 return (EINVAL); 315 316 TAILQ_FOREACH(de, &devices, list) { 317 if (bcmp(d, &de->entry, sizeof(*d)) == 0) { 318 TAILQ_REMOVE(&devices, de, list); 319 free(de, M_LINUX); 320 321 return (0); 322 } 323 } 324 325 return (EINVAL); 326 } 327 328 bool 329 linux_use_real_ifname(const struct ifnet *ifp) 330 { 331 return (use_real_ifnames || !IFP_IS_ETH(ifp)); 332 } 333