1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org> 5 * 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 AUTHORS AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 #include "opt_geom.h" 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/kernel.h> 35 #include <sys/module.h> 36 #include <sys/lock.h> 37 #include <sys/mutex.h> 38 #include <sys/bio.h> 39 #include <sys/ctype.h> 40 #include <sys/malloc.h> 41 #include <sys/libkern.h> 42 #include <sys/sbuf.h> 43 #include <sys/stddef.h> 44 #include <sys/sysctl.h> 45 #include <geom/geom.h> 46 #include <geom/geom_dbg.h> 47 #include <geom/geom_slice.h> 48 #include <geom/label/g_label.h> 49 50 FEATURE(geom_label, "GEOM labeling support"); 51 52 SYSCTL_DECL(_kern_geom); 53 SYSCTL_NODE(_kern_geom, OID_AUTO, label, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 54 "GEOM_LABEL stuff"); 55 u_int g_label_debug = 0; 56 SYSCTL_UINT(_kern_geom_label, OID_AUTO, debug, CTLFLAG_RWTUN, &g_label_debug, 0, 57 "Debug level"); 58 59 static int g_label_destroy_geom(struct gctl_req *req, struct g_class *mp, 60 struct g_geom *gp); 61 static int g_label_destroy(struct g_geom *gp, boolean_t force); 62 static struct g_geom *g_label_taste(struct g_class *mp, struct g_provider *pp, 63 int flags __unused); 64 static void g_label_generic_taste(struct g_consumer *, char *, size_t); 65 static void g_label_config(struct gctl_req *req, struct g_class *mp, 66 const char *verb); 67 68 #define G_LABEL_DIRPREFIX "label/" 69 70 struct g_class g_label_class = { 71 .name = G_LABEL_CLASS_NAME, 72 .version = G_VERSION, 73 .ctlreq = g_label_config, 74 .taste = g_label_taste, 75 .destroy_geom = g_label_destroy_geom 76 }; 77 78 static struct g_label_desc g_label_generic = { 79 .ld_taste = g_label_generic_taste, 80 .ld_dirprefix = G_LABEL_DIRPREFIX, 81 .ld_enabled = 1 82 }; 83 84 /* 85 * To add a new file system where you want to look for volume labels, 86 * you have to: 87 * 1. Add a file g_label_<file system>.c which implements labels recognition. 88 * 2. Add an 'extern const struct g_label_desc g_label_<file system>;' into 89 * g_label.h file. 90 * 3. Add an element to the table below '&g_label_<file system>,'. 91 * 4. Add your file to sys/conf/files. 92 * 5. Add your file to sys/modules/geom/geom_label/Makefile. 93 * 6. Add your file system to manual page sbin/geom/class/label/glabel.8. 94 */ 95 const struct g_label_desc *g_labels[] = { 96 &g_label_gpt, 97 &g_label_gpt_uuid, 98 #ifdef GEOM_LABEL 99 &g_label_ufs_id, 100 &g_label_ufs_volume, 101 &g_label_iso9660, 102 &g_label_msdosfs, 103 &g_label_ext2fs, 104 &g_label_ntfs, 105 &g_label_disk_ident, 106 &g_label_flashmap, 107 &g_label_swaplinux, 108 #endif 109 &g_label_generic, 110 NULL 111 }; 112 113 void 114 g_label_rtrim(char *label, size_t size) 115 { 116 ptrdiff_t i; 117 118 for (i = size - 1; i >= 0; i--) { 119 if (label[i] == '\0') 120 continue; 121 else if (label[i] == ' ') 122 label[i] = '\0'; 123 else 124 break; 125 } 126 } 127 128 static int 129 g_label_destroy_geom(struct gctl_req *req __unused, struct g_class *mp, 130 struct g_geom *gp __unused) 131 { 132 133 /* 134 * XXX: Unloading a class which is using geom_slice:1.56 is currently 135 * XXX: broken, so we deny unloading when we have geoms. 136 */ 137 return (EOPNOTSUPP); 138 } 139 140 static void 141 g_label_orphan(struct g_consumer *cp) 142 { 143 144 G_LABEL_DEBUG(1, "Label %s removed.", 145 LIST_FIRST(&cp->geom->provider)->name); 146 g_slice_orphan(cp); 147 } 148 149 static void 150 g_label_spoiled(struct g_consumer *cp) 151 { 152 153 G_LABEL_DEBUG(1, "Label %s removed.", 154 LIST_FIRST(&cp->geom->provider)->name); 155 g_slice_spoiled(cp); 156 } 157 158 static void 159 g_label_resize(struct g_consumer *cp) 160 { 161 162 G_LABEL_DEBUG(1, "Label %s resized.", 163 LIST_FIRST(&cp->geom->provider)->name); 164 165 g_slice_config(cp->geom, 0, G_SLICE_CONFIG_FORCE, (off_t)0, 166 cp->provider->mediasize, cp->provider->sectorsize, "notused"); 167 } 168 169 static int 170 g_label_is_name_ok(const char *label) 171 { 172 const char *s; 173 174 /* Check if the label starts from ../ */ 175 if (strncmp(label, "../", 3) == 0) 176 return (0); 177 /* Check if the label contains /../ */ 178 if (strstr(label, "/../") != NULL) 179 return (0); 180 /* Check if the label ends at ../ */ 181 if ((s = strstr(label, "/..")) != NULL && s[3] == '\0') 182 return (0); 183 return (1); 184 } 185 186 static void 187 g_label_mangle_name(char *label, size_t size) 188 { 189 struct sbuf *sb; 190 const u_char *c; 191 size_t len, i; 192 193 /* Trim trailing whitespace. */ 194 len = strlen(label); 195 for (i = len; i > 0; i--) { 196 if (isspace(label[i - 1])) 197 label[i - 1] = '\0'; 198 else 199 break; 200 } 201 if (*label == '\0') 202 return; 203 204 sb = sbuf_new(NULL, NULL, size, SBUF_FIXEDLEN); 205 for (c = label; *c != '\0'; c++) { 206 /* Trim leading whitespace. */ 207 if (isspace(*c) && sbuf_len(sb) == 0) 208 continue; 209 if (!isprint(*c) || isspace(*c) || *c =='"' || *c == '%') 210 sbuf_printf(sb, "%%%02X", *c); 211 else 212 sbuf_putc(sb, *c); 213 } 214 if (sbuf_finish(sb) != 0) 215 label[0] = '\0'; 216 else 217 strlcpy(label, sbuf_data(sb), size); 218 sbuf_delete(sb); 219 } 220 221 static struct g_geom * 222 g_label_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp, 223 const char *label, const char *dirprefix, off_t mediasize) 224 { 225 struct g_geom *gp; 226 struct g_provider *pp2; 227 struct g_consumer *cp; 228 char name[64]; 229 230 g_topology_assert(); 231 232 if (!g_label_is_name_ok(label)) { 233 G_LABEL_DEBUG(0, "%s contains suspicious label, skipping.", 234 pp->name); 235 G_LABEL_DEBUG(1, "%s suspicious label is: %s", pp->name, label); 236 if (req != NULL) 237 gctl_error(req, "Label name %s is invalid.", label); 238 return (NULL); 239 } 240 gp = NULL; 241 cp = NULL; 242 if (snprintf(name, sizeof(name), "%s%s", dirprefix, label) >= sizeof(name)) { 243 if (req != NULL) 244 gctl_error(req, "Label name %s is too long.", label); 245 return (NULL); 246 } 247 LIST_FOREACH(gp, &mp->geom, geom) { 248 pp2 = LIST_FIRST(&gp->provider); 249 if (pp2 == NULL) 250 continue; 251 if ((pp2->flags & G_PF_ORPHAN) != 0) 252 continue; 253 if (strcmp(pp2->name, name) == 0) { 254 G_LABEL_DEBUG(1, "Label %s(%s) already exists (%s).", 255 label, name, pp->name); 256 if (req != NULL) { 257 gctl_error(req, "Provider %s already exists.", 258 name); 259 } 260 return (NULL); 261 } 262 } 263 gp = g_slice_new(mp, 1, pp, &cp, NULL, 0, NULL); 264 if (gp == NULL) { 265 G_LABEL_DEBUG(0, "Cannot create slice %s.", label); 266 if (req != NULL) 267 gctl_error(req, "Cannot create slice %s.", label); 268 return (NULL); 269 } 270 gp->orphan = g_label_orphan; 271 gp->spoiled = g_label_spoiled; 272 gp->resize = g_label_resize; 273 g_access(cp, -1, 0, 0); 274 g_slice_config(gp, 0, G_SLICE_CONFIG_SET, (off_t)0, mediasize, 275 pp->sectorsize, "%s", name); 276 G_LABEL_DEBUG(1, "Label for provider %s is %s.", pp->name, name); 277 return (gp); 278 } 279 280 static int 281 g_label_destroy(struct g_geom *gp, boolean_t force) 282 { 283 struct g_provider *pp; 284 285 g_topology_assert(); 286 pp = LIST_FIRST(&gp->provider); 287 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 288 if (force) { 289 G_LABEL_DEBUG(0, "Provider %s is still open, so it " 290 "can't be definitely removed.", pp->name); 291 } else { 292 G_LABEL_DEBUG(1, 293 "Provider %s is still open (r%dw%de%d).", pp->name, 294 pp->acr, pp->acw, pp->ace); 295 return (EBUSY); 296 } 297 } else if (pp != NULL) 298 G_LABEL_DEBUG(1, "Label %s removed.", pp->name); 299 g_slice_spoiled(LIST_FIRST(&gp->consumer)); 300 return (0); 301 } 302 303 static int 304 g_label_read_metadata(struct g_consumer *cp, struct g_label_metadata *md) 305 { 306 struct g_provider *pp; 307 u_char *buf; 308 int error; 309 310 pp = cp->provider; 311 if (pp->sectorsize < sizeof(*md)) 312 return (EINVAL); 313 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 314 &error); 315 if (buf == NULL) 316 return (error); 317 /* Decode metadata. */ 318 label_metadata_decode(buf, md); 319 g_free(buf); 320 321 return (0); 322 } 323 324 static void 325 g_label_orphan_taste(struct g_consumer *cp __unused) 326 { 327 328 KASSERT(1 == 0, ("%s called?", __func__)); 329 } 330 331 static void 332 g_label_start_taste(struct bio *bp __unused) 333 { 334 335 KASSERT(1 == 0, ("%s called?", __func__)); 336 } 337 338 static int 339 g_label_access_taste(struct g_provider *pp __unused, int dr __unused, 340 int dw __unused, int de __unused) 341 { 342 343 KASSERT(1 == 0, ("%s called", __func__)); 344 return (EOPNOTSUPP); 345 } 346 347 static void 348 g_label_generic_taste(struct g_consumer *cp, char *label, size_t size) 349 { 350 struct g_provider *pp; 351 struct g_label_metadata md; 352 353 g_topology_assert_not(); 354 label[0] = '\0'; 355 pp = cp->provider; 356 357 if (g_label_read_metadata(cp, &md) != 0) 358 return; 359 360 if (strcmp(md.md_magic, G_LABEL_MAGIC) != 0) 361 return; 362 363 if (md.md_version > G_LABEL_VERSION) { 364 printf("geom_label.ko module is too old to handle %s.\n", 365 pp->name); 366 return; 367 } 368 /* 369 * Backward compatibility: there was no md_provsize field in 370 * earlier versions of metadata, so only check if we have it. 371 */ 372 if (md.md_version >= 2 && md.md_provsize != pp->mediasize) 373 return; 374 375 strlcpy(label, md.md_label, size); 376 } 377 378 static struct g_geom * 379 g_label_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 380 { 381 struct g_consumer *cp; 382 struct g_geom *gp; 383 off_t mediasize; 384 int i; 385 386 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 387 g_topology_assert(); 388 389 G_LABEL_DEBUG(2, "Tasting %s.", pp->name); 390 391 /* Skip providers that are already open for writing. */ 392 if (pp->acw > 0) 393 return (NULL); 394 395 /* Skip broken disks that don't set their sector size */ 396 if (pp->sectorsize == 0) 397 return (NULL); 398 399 if (strcmp(pp->geom->class->name, mp->name) == 0) 400 return (NULL); 401 402 gp = g_new_geomf(mp, "label:taste"); 403 gp->start = g_label_start_taste; 404 gp->access = g_label_access_taste; 405 gp->orphan = g_label_orphan_taste; 406 cp = g_new_consumer(gp); 407 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 408 if (g_attach(cp, pp) != 0) 409 goto end2; 410 if (g_access(cp, 1, 0, 0) != 0) 411 goto end; 412 for (i = 0; g_labels[i] != NULL; i++) { 413 char label[128]; 414 415 if (g_labels[i]->ld_enabled == 0) 416 continue; 417 g_topology_unlock(); 418 g_labels[i]->ld_taste(cp, label, sizeof(label)); 419 g_label_mangle_name(label, sizeof(label)); 420 g_topology_lock(); 421 if (label[0] == '\0') 422 continue; 423 if (g_labels[i] != &g_label_generic) { 424 mediasize = pp->mediasize; 425 } else { 426 mediasize = pp->mediasize - pp->sectorsize; 427 } 428 g_label_create(NULL, mp, pp, label, 429 g_labels[i]->ld_dirprefix, mediasize); 430 } 431 g_access(cp, -1, 0, 0); 432 end: 433 g_detach(cp); 434 end2: 435 g_destroy_consumer(cp); 436 g_destroy_geom(gp); 437 return (NULL); 438 } 439 440 static void 441 g_label_ctl_create(struct gctl_req *req, struct g_class *mp) 442 { 443 struct g_provider *pp; 444 const char *name; 445 int *nargs; 446 447 g_topology_assert(); 448 449 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 450 if (nargs == NULL) { 451 gctl_error(req, "No '%s' argument", "nargs"); 452 return; 453 } 454 if (*nargs != 2) { 455 gctl_error(req, "Invalid number of arguments."); 456 return; 457 } 458 /* 459 * arg1 is the name of provider. 460 */ 461 pp = gctl_get_provider(req, "arg1"); 462 if (pp == NULL) 463 return; 464 /* 465 * arg0 is the label. 466 */ 467 name = gctl_get_asciiparam(req, "arg0"); 468 if (name == NULL) { 469 gctl_error(req, "No 'arg%d' argument", 0); 470 return; 471 } 472 g_label_create(req, mp, pp, name, G_LABEL_DIRPREFIX, pp->mediasize); 473 } 474 475 static const char * 476 g_label_skip_dir(const char *name) 477 { 478 u_int i; 479 480 if (strncmp(name, _PATH_DEV, strlen(_PATH_DEV)) == 0) 481 name += strlen(_PATH_DEV); 482 for (i = 0; g_labels[i] != NULL; i++) { 483 if (strncmp(name, g_labels[i]->ld_dirprefix, 484 strlen(g_labels[i]->ld_dirprefix)) == 0) { 485 name += strlen(g_labels[i]->ld_dirprefix); 486 break; 487 } 488 } 489 return (name); 490 } 491 492 static struct g_geom * 493 g_label_find_geom(struct g_class *mp, const char *name) 494 { 495 struct g_geom *gp; 496 struct g_provider *pp; 497 const char *pname; 498 499 name = g_label_skip_dir(name); 500 LIST_FOREACH(gp, &mp->geom, geom) { 501 pp = LIST_FIRST(&gp->provider); 502 pname = g_label_skip_dir(pp->name); 503 if (strcmp(pname, name) == 0) 504 return (gp); 505 } 506 return (NULL); 507 } 508 509 static void 510 g_label_ctl_destroy(struct gctl_req *req, struct g_class *mp) 511 { 512 int *nargs, *force, error, i; 513 struct g_geom *gp; 514 const char *name; 515 char param[16]; 516 517 g_topology_assert(); 518 519 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 520 if (nargs == NULL) { 521 gctl_error(req, "No '%s' argument", "nargs"); 522 return; 523 } 524 if (*nargs <= 0) { 525 gctl_error(req, "Missing device(s)."); 526 return; 527 } 528 force = gctl_get_paraml(req, "force", sizeof(*force)); 529 if (force == NULL) { 530 gctl_error(req, "No 'force' argument"); 531 return; 532 } 533 534 for (i = 0; i < *nargs; i++) { 535 snprintf(param, sizeof(param), "arg%d", i); 536 name = gctl_get_asciiparam(req, param); 537 if (name == NULL) { 538 gctl_error(req, "No 'arg%d' argument", i); 539 return; 540 } 541 gp = g_label_find_geom(mp, name); 542 if (gp == NULL) { 543 G_LABEL_DEBUG(1, "Label %s is invalid.", name); 544 gctl_error(req, "Label %s is invalid.", name); 545 return; 546 } 547 error = g_label_destroy(gp, *force); 548 if (error != 0) { 549 gctl_error(req, "Cannot destroy label %s (error=%d).", 550 LIST_FIRST(&gp->provider)->name, error); 551 return; 552 } 553 } 554 } 555 556 static void 557 g_label_config(struct gctl_req *req, struct g_class *mp, const char *verb) 558 { 559 uint32_t *version; 560 561 g_topology_assert(); 562 563 version = gctl_get_paraml(req, "version", sizeof(*version)); 564 if (version == NULL) { 565 gctl_error(req, "No '%s' argument.", "version"); 566 return; 567 } 568 if (*version != G_LABEL_VERSION) { 569 gctl_error(req, "Userland and kernel parts are out of sync."); 570 return; 571 } 572 573 if (strcmp(verb, "create") == 0) { 574 g_label_ctl_create(req, mp); 575 return; 576 } else if (strcmp(verb, "destroy") == 0 || 577 strcmp(verb, "stop") == 0) { 578 g_label_ctl_destroy(req, mp); 579 return; 580 } 581 582 gctl_error(req, "Unknown verb."); 583 } 584 585 DECLARE_GEOM_CLASS(g_label_class, g_label); 586 MODULE_VERSION(geom_label, 0); 587