module.c revision 294984
1/*- 2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: stable/10/sys/boot/common/module.c 294984 2016-01-28 12:22:15Z smh $"); 29 30/* 31 * file/module function dispatcher, support, etc. 32 */ 33 34#include <stand.h> 35#include <string.h> 36#include <sys/param.h> 37#include <sys/linker.h> 38#include <sys/module.h> 39#include <sys/queue.h> 40 41#include "bootstrap.h" 42 43#define MDIR_REMOVED 0x0001 44#define MDIR_NOHINTS 0x0002 45 46struct moduledir { 47 char *d_path; /* path of modules directory */ 48 u_char *d_hints; /* content of linker.hints file */ 49 int d_hintsz; /* size of hints data */ 50 int d_flags; 51 STAILQ_ENTRY(moduledir) d_link; 52}; 53 54static int file_load(char *filename, vm_offset_t dest, struct preloaded_file **result); 55static int file_load_dependencies(struct preloaded_file *base_mod); 56static char * file_search(const char *name, char **extlist); 57static struct kernel_module * file_findmodule(struct preloaded_file *fp, char *modname, struct mod_depend *verinfo); 58static int file_havepath(const char *name); 59static char *mod_searchmodule(char *name, struct mod_depend *verinfo); 60static void file_insert_tail(struct preloaded_file *mp); 61struct file_metadata* metadata_next(struct file_metadata *base_mp, int type); 62static void moduledir_readhints(struct moduledir *mdp); 63static void moduledir_rebuild(void); 64 65/* load address should be tweaked by first module loaded (kernel) */ 66static vm_offset_t loadaddr = 0; 67 68#if defined(LOADER_FDT_SUPPORT) 69static const char *default_searchpath = 70 "/boot/kernel;/boot/modules;/boot/dtb"; 71#else 72static const char *default_searchpath ="/boot/kernel;/boot/modules"; 73#endif 74 75static STAILQ_HEAD(, moduledir) moduledir_list = STAILQ_HEAD_INITIALIZER(moduledir_list); 76 77struct preloaded_file *preloaded_files = NULL; 78 79static char *kld_ext_list[] = { 80 ".ko", 81 "", 82 ".debug", 83 NULL 84}; 85 86 87/* 88 * load an object, either a disk file or code module. 89 * 90 * To load a file, the syntax is: 91 * 92 * load -t <type> <path> 93 * 94 * code modules are loaded as: 95 * 96 * load <path> <options> 97 */ 98 99COMMAND_SET(load, "load", "load a kernel or module", command_load); 100 101static int 102command_load(int argc, char *argv[]) 103{ 104 struct preloaded_file *fp; 105 char *typestr; 106 int dofile, dokld, ch, error; 107 108 dokld = dofile = 0; 109 optind = 1; 110 optreset = 1; 111 typestr = NULL; 112 if (argc == 1) { 113 command_errmsg = "no filename specified"; 114 return(CMD_ERROR); 115 } 116 while ((ch = getopt(argc, argv, "kt:")) != -1) { 117 switch(ch) { 118 case 'k': 119 dokld = 1; 120 break; 121 case 't': 122 typestr = optarg; 123 dofile = 1; 124 break; 125 case '?': 126 default: 127 /* getopt has already reported an error */ 128 return(CMD_OK); 129 } 130 } 131 argv += (optind - 1); 132 argc -= (optind - 1); 133 134 /* 135 * Request to load a raw file? 136 */ 137 if (dofile) { 138 if ((argc != 2) || (typestr == NULL) || (*typestr == 0)) { 139 command_errmsg = "invalid load type"; 140 return(CMD_ERROR); 141 } 142 143 fp = file_findfile(argv[1], typestr); 144 if (fp) { 145 sprintf(command_errbuf, "warning: file '%s' already loaded", argv[1]); 146 return (CMD_ERROR); 147 } 148 149 return (file_loadraw(argv[1], typestr, 1) ? CMD_OK : CMD_ERROR); 150 } 151 /* 152 * Do we have explicit KLD load ? 153 */ 154 if (dokld || file_havepath(argv[1])) { 155 error = mod_loadkld(argv[1], argc - 2, argv + 2); 156 if (error == EEXIST) 157 sprintf(command_errbuf, "warning: KLD '%s' already loaded", argv[1]); 158 return (error == 0 ? CMD_OK : CMD_ERROR); 159 } 160 /* 161 * Looks like a request for a module. 162 */ 163 error = mod_load(argv[1], NULL, argc - 2, argv + 2); 164 if (error == EEXIST) 165 sprintf(command_errbuf, "warning: module '%s' already loaded", argv[1]); 166 return (error == 0 ? CMD_OK : CMD_ERROR); 167} 168 169COMMAND_SET(load_geli, "load_geli", "load a geli key", command_load_geli); 170 171static int 172command_load_geli(int argc, char *argv[]) 173{ 174 char typestr[80]; 175 char *cp; 176 int ch, num; 177 178 if (argc < 3) { 179 command_errmsg = "usage is [-n key#] <prov> <file>"; 180 return(CMD_ERROR); 181 } 182 183 num = 0; 184 optind = 1; 185 optreset = 1; 186 while ((ch = getopt(argc, argv, "n:")) != -1) { 187 switch(ch) { 188 case 'n': 189 num = strtol(optarg, &cp, 0); 190 if (cp == optarg) { 191 sprintf(command_errbuf, "bad key index '%s'", optarg); 192 return(CMD_ERROR); 193 } 194 break; 195 case '?': 196 default: 197 /* getopt has already reported an error */ 198 return(CMD_OK); 199 } 200 } 201 argv += (optind - 1); 202 argc -= (optind - 1); 203 sprintf(typestr, "%s:geli_keyfile%d", argv[1], num); 204 return (file_loadraw(argv[2], typestr, 1) ? CMD_OK : CMD_ERROR); 205} 206 207COMMAND_SET(unload, "unload", "unload all modules", command_unload); 208 209static int 210command_unload(int argc, char *argv[]) 211{ 212 struct preloaded_file *fp; 213 214 while (preloaded_files != NULL) { 215 fp = preloaded_files; 216 preloaded_files = preloaded_files->f_next; 217 file_discard(fp); 218 } 219 loadaddr = 0; 220 unsetenv("kernelname"); 221 return(CMD_OK); 222} 223 224COMMAND_SET(lsmod, "lsmod", "list loaded modules", command_lsmod); 225 226static int 227command_lsmod(int argc, char *argv[]) 228{ 229 struct preloaded_file *fp; 230 struct kernel_module *mp; 231 struct file_metadata *md; 232 char lbuf[80]; 233 int ch, verbose; 234 235 verbose = 0; 236 optind = 1; 237 optreset = 1; 238 while ((ch = getopt(argc, argv, "v")) != -1) { 239 switch(ch) { 240 case 'v': 241 verbose = 1; 242 break; 243 case '?': 244 default: 245 /* getopt has already reported an error */ 246 return(CMD_OK); 247 } 248 } 249 250 pager_open(); 251 for (fp = preloaded_files; fp; fp = fp->f_next) { 252 sprintf(lbuf, " %p: %s (%s, 0x%lx)\n", 253 (void *) fp->f_addr, fp->f_name, fp->f_type, (long) fp->f_size); 254 pager_output(lbuf); 255 if (fp->f_args != NULL) { 256 pager_output(" args: "); 257 pager_output(fp->f_args); 258 pager_output("\n"); 259 } 260 if (fp->f_modules) { 261 pager_output(" modules: "); 262 for (mp = fp->f_modules; mp; mp = mp->m_next) { 263 sprintf(lbuf, "%s.%d ", mp->m_name, mp->m_version); 264 pager_output(lbuf); 265 } 266 pager_output("\n"); 267 } 268 if (verbose) { 269 /* XXX could add some formatting smarts here to display some better */ 270 for (md = fp->f_metadata; md != NULL; md = md->md_next) { 271 sprintf(lbuf, " 0x%04x, 0x%lx\n", md->md_type, (long) md->md_size); 272 pager_output(lbuf); 273 } 274 } 275 } 276 pager_close(); 277 return(CMD_OK); 278} 279 280/* 281 * File level interface, functions file_* 282 */ 283int 284file_load(char *filename, vm_offset_t dest, struct preloaded_file **result) 285{ 286 static int last_file_format = 0; 287 struct preloaded_file *fp; 288 int error; 289 int i; 290 291 if (archsw.arch_loadaddr != NULL) 292 dest = archsw.arch_loadaddr(LOAD_RAW, filename, dest); 293 294 error = EFTYPE; 295 for (i = last_file_format, fp = NULL; 296 file_formats[i] && fp == NULL; i++) { 297 error = (file_formats[i]->l_load)(filename, dest, &fp); 298 if (error == 0) { 299 fp->f_loader = last_file_format = i; /* remember the loader */ 300 *result = fp; 301 break; 302 } else if (last_file_format == i && i != 0) { 303 /* Restart from the beginning */ 304 i = -1; 305 last_file_format = 0; 306 fp = NULL; 307 continue; 308 } 309 if (error == EFTYPE) 310 continue; /* Unknown to this handler? */ 311 if (error) { 312 sprintf(command_errbuf, "can't load file '%s': %s", 313 filename, strerror(error)); 314 break; 315 } 316 } 317 return (error); 318} 319 320static int 321file_load_dependencies(struct preloaded_file *base_file) 322{ 323 struct file_metadata *md; 324 struct preloaded_file *fp; 325 struct mod_depend *verinfo; 326 struct kernel_module *mp; 327 char *dmodname; 328 int error; 329 330 md = file_findmetadata(base_file, MODINFOMD_DEPLIST); 331 if (md == NULL) 332 return (0); 333 error = 0; 334 do { 335 verinfo = (struct mod_depend*)md->md_data; 336 dmodname = (char *)(verinfo + 1); 337 if (file_findmodule(NULL, dmodname, verinfo) == NULL) { 338 printf("loading required module '%s'\n", dmodname); 339 error = mod_load(dmodname, verinfo, 0, NULL); 340 if (error) 341 break; 342 /* 343 * If module loaded via kld name which isn't listed 344 * in the linker.hints file, we should check if it have 345 * required version. 346 */ 347 mp = file_findmodule(NULL, dmodname, verinfo); 348 if (mp == NULL) { 349 sprintf(command_errbuf, "module '%s' exists but with wrong version", 350 dmodname); 351 error = ENOENT; 352 break; 353 } 354 } 355 md = metadata_next(md, MODINFOMD_DEPLIST); 356 } while (md); 357 if (!error) 358 return (0); 359 /* Load failed; discard everything */ 360 while (base_file != NULL) { 361 fp = base_file; 362 base_file = base_file->f_next; 363 file_discard(fp); 364 } 365 return (error); 366} 367 368/* 369 * We've been asked to load (fname) as (type), so just suck it in, 370 * no arguments or anything. 371 */ 372struct preloaded_file * 373file_loadraw(const char *fname, char *type, int insert) 374{ 375 struct preloaded_file *fp; 376 char *name; 377 int fd, got; 378 vm_offset_t laddr; 379 380 /* We can't load first */ 381 if ((file_findfile(NULL, NULL)) == NULL) { 382 command_errmsg = "can't load file before kernel"; 383 return(NULL); 384 } 385 386 /* locate the file on the load path */ 387 name = file_search(fname, NULL); 388 if (name == NULL) { 389 sprintf(command_errbuf, "can't find '%s'", fname); 390 return(NULL); 391 } 392 393 if ((fd = open(name, O_RDONLY)) < 0) { 394 sprintf(command_errbuf, "can't open '%s': %s", name, strerror(errno)); 395 free(name); 396 return(NULL); 397 } 398 399 if (archsw.arch_loadaddr != NULL) 400 loadaddr = archsw.arch_loadaddr(LOAD_RAW, name, loadaddr); 401 402 laddr = loadaddr; 403 for (;;) { 404 /* read in 4k chunks; size is not really important */ 405 got = archsw.arch_readin(fd, laddr, 4096); 406 if (got == 0) /* end of file */ 407 break; 408 if (got < 0) { /* error */ 409 sprintf(command_errbuf, "error reading '%s': %s", name, strerror(errno)); 410 free(name); 411 close(fd); 412 return(NULL); 413 } 414 laddr += got; 415 } 416 417 /* Looks OK so far; create & populate control structure */ 418 fp = file_alloc(); 419 fp->f_name = strdup(name); 420 fp->f_type = strdup(type); 421 fp->f_args = NULL; 422 fp->f_metadata = NULL; 423 fp->f_loader = -1; 424 fp->f_addr = loadaddr; 425 fp->f_size = laddr - loadaddr; 426 427 /* recognise space consumption */ 428 loadaddr = laddr; 429 430 /* Add to the list of loaded files */ 431 if (insert != 0) 432 file_insert_tail(fp); 433 close(fd); 434 return(fp); 435} 436 437/* 438 * Load the module (name), pass it (argc),(argv), add container file 439 * to the list of loaded files. 440 * If module is already loaded just assign new argc/argv. 441 */ 442int 443mod_load(char *modname, struct mod_depend *verinfo, int argc, char *argv[]) 444{ 445 struct kernel_module *mp; 446 int err; 447 char *filename; 448 449 if (file_havepath(modname)) { 450 printf("Warning: mod_load() called instead of mod_loadkld() for module '%s'\n", modname); 451 return (mod_loadkld(modname, argc, argv)); 452 } 453 /* see if module is already loaded */ 454 mp = file_findmodule(NULL, modname, verinfo); 455 if (mp) { 456#ifdef moduleargs 457 if (mp->m_args) 458 free(mp->m_args); 459 mp->m_args = unargv(argc, argv); 460#endif 461 sprintf(command_errbuf, "warning: module '%s' already loaded", mp->m_name); 462 return (0); 463 } 464 /* locate file with the module on the search path */ 465 filename = mod_searchmodule(modname, verinfo); 466 if (filename == NULL) { 467 sprintf(command_errbuf, "can't find '%s'", modname); 468 return (ENOENT); 469 } 470 err = mod_loadkld(filename, argc, argv); 471 return (err); 472} 473 474/* 475 * Load specified KLD. If path is omitted, then try to locate it via 476 * search path. 477 */ 478int 479mod_loadkld(const char *kldname, int argc, char *argv[]) 480{ 481 struct preloaded_file *fp, *last_file; 482 int err; 483 char *filename; 484 485 /* 486 * Get fully qualified KLD name 487 */ 488 filename = file_search(kldname, kld_ext_list); 489 if (filename == NULL) { 490 sprintf(command_errbuf, "can't find '%s'", kldname); 491 return (ENOENT); 492 } 493 /* 494 * Check if KLD already loaded 495 */ 496 fp = file_findfile(filename, NULL); 497 if (fp) { 498 sprintf(command_errbuf, "warning: KLD '%s' already loaded", filename); 499 free(filename); 500 return (0); 501 } 502 for (last_file = preloaded_files; 503 last_file != NULL && last_file->f_next != NULL; 504 last_file = last_file->f_next) 505 ; 506 507 do { 508 err = file_load(filename, loadaddr, &fp); 509 if (err) 510 break; 511 fp->f_args = unargv(argc, argv); 512 loadaddr = fp->f_addr + fp->f_size; 513 file_insert_tail(fp); /* Add to the list of loaded files */ 514 if (file_load_dependencies(fp) != 0) { 515 err = ENOENT; 516 last_file->f_next = NULL; 517 loadaddr = last_file->f_addr + last_file->f_size; 518 fp = NULL; 519 break; 520 } 521 } while(0); 522 if (err == EFTYPE) 523 sprintf(command_errbuf, "don't know how to load module '%s'", filename); 524 if (err && fp) 525 file_discard(fp); 526 free(filename); 527 return (err); 528} 529 530/* 531 * Find a file matching (name) and (type). 532 * NULL may be passed as a wildcard to either. 533 */ 534struct preloaded_file * 535file_findfile(const char *name, const char *type) 536{ 537 struct preloaded_file *fp; 538 539 for (fp = preloaded_files; fp != NULL; fp = fp->f_next) { 540 if (((name == NULL) || !strcmp(name, fp->f_name)) && 541 ((type == NULL) || !strcmp(type, fp->f_type))) 542 break; 543 } 544 return (fp); 545} 546 547/* 548 * Find a module matching (name) inside of given file. 549 * NULL may be passed as a wildcard. 550 */ 551struct kernel_module * 552file_findmodule(struct preloaded_file *fp, char *modname, 553 struct mod_depend *verinfo) 554{ 555 struct kernel_module *mp, *best; 556 int bestver, mver; 557 558 if (fp == NULL) { 559 for (fp = preloaded_files; fp; fp = fp->f_next) { 560 mp = file_findmodule(fp, modname, verinfo); 561 if (mp) 562 return (mp); 563 } 564 return (NULL); 565 } 566 best = NULL; 567 bestver = 0; 568 for (mp = fp->f_modules; mp; mp = mp->m_next) { 569 if (strcmp(modname, mp->m_name) == 0) { 570 if (verinfo == NULL) 571 return (mp); 572 mver = mp->m_version; 573 if (mver == verinfo->md_ver_preferred) 574 return (mp); 575 if (mver >= verinfo->md_ver_minimum && 576 mver <= verinfo->md_ver_maximum && 577 mver > bestver) { 578 best = mp; 579 bestver = mver; 580 } 581 } 582 } 583 return (best); 584} 585/* 586 * Make a copy of (size) bytes of data from (p), and associate them as 587 * metadata of (type) to the module (mp). 588 */ 589void 590file_addmetadata(struct preloaded_file *fp, int type, size_t size, void *p) 591{ 592 struct file_metadata *md; 593 594 md = malloc(sizeof(struct file_metadata) - sizeof(md->md_data) + size); 595 md->md_size = size; 596 md->md_type = type; 597 bcopy(p, md->md_data, size); 598 md->md_next = fp->f_metadata; 599 fp->f_metadata = md; 600} 601 602/* 603 * Find a metadata object of (type) associated with the file (fp) 604 */ 605struct file_metadata * 606file_findmetadata(struct preloaded_file *fp, int type) 607{ 608 struct file_metadata *md; 609 610 for (md = fp->f_metadata; md != NULL; md = md->md_next) 611 if (md->md_type == type) 612 break; 613 return(md); 614} 615 616struct file_metadata * 617metadata_next(struct file_metadata *md, int type) 618{ 619 if (md == NULL) 620 return (NULL); 621 while((md = md->md_next) != NULL) 622 if (md->md_type == type) 623 break; 624 return (md); 625} 626 627static char *emptyextlist[] = { "", NULL }; 628 629/* 630 * Check if the given file is in place and return full path to it. 631 */ 632static char * 633file_lookup(const char *path, const char *name, int namelen, char **extlist) 634{ 635 struct stat st; 636 char *result, *cp, **cpp; 637 int pathlen, extlen, len; 638 639 pathlen = strlen(path); 640 extlen = 0; 641 if (extlist == NULL) 642 extlist = emptyextlist; 643 for (cpp = extlist; *cpp; cpp++) { 644 len = strlen(*cpp); 645 if (len > extlen) 646 extlen = len; 647 } 648 result = malloc(pathlen + namelen + extlen + 2); 649 if (result == NULL) 650 return (NULL); 651 bcopy(path, result, pathlen); 652 if (pathlen > 0 && result[pathlen - 1] != '/') 653 result[pathlen++] = '/'; 654 cp = result + pathlen; 655 bcopy(name, cp, namelen); 656 cp += namelen; 657 for (cpp = extlist; *cpp; cpp++) { 658 strcpy(cp, *cpp); 659 if (stat(result, &st) == 0 && S_ISREG(st.st_mode)) 660 return result; 661 } 662 free(result); 663 return NULL; 664} 665 666/* 667 * Check if file name have any qualifiers 668 */ 669static int 670file_havepath(const char *name) 671{ 672 const char *cp; 673 674 archsw.arch_getdev(NULL, name, &cp); 675 return (cp != name || strchr(name, '/') != NULL); 676} 677 678/* 679 * Attempt to find the file (name) on the module searchpath. 680 * If (name) is qualified in any way, we simply check it and 681 * return it or NULL. If it is not qualified, then we attempt 682 * to construct a path using entries in the environment variable 683 * module_path. 684 * 685 * The path we return a pointer to need never be freed, as we manage 686 * it internally. 687 */ 688static char * 689file_search(const char *name, char **extlist) 690{ 691 struct moduledir *mdp; 692 struct stat sb; 693 char *result; 694 int namelen; 695 696 /* Don't look for nothing */ 697 if (name == NULL) 698 return(NULL); 699 700 if (*name == 0) 701 return(strdup(name)); 702 703 if (file_havepath(name)) { 704 /* Qualified, so just see if it exists */ 705 if (stat(name, &sb) == 0) 706 return(strdup(name)); 707 return(NULL); 708 } 709 moduledir_rebuild(); 710 result = NULL; 711 namelen = strlen(name); 712 STAILQ_FOREACH(mdp, &moduledir_list, d_link) { 713 result = file_lookup(mdp->d_path, name, namelen, extlist); 714 if (result) 715 break; 716 } 717 return(result); 718} 719 720#define INT_ALIGN(base, ptr) ptr = \ 721 (base) + (((ptr) - (base) + sizeof(int) - 1) & ~(sizeof(int) - 1)) 722 723static char * 724mod_search_hints(struct moduledir *mdp, const char *modname, 725 struct mod_depend *verinfo) 726{ 727 u_char *cp, *recptr, *bufend, *best; 728 char *result; 729 int *intp, bestver, blen, clen, found, ival, modnamelen, reclen; 730 731 moduledir_readhints(mdp); 732 modnamelen = strlen(modname); 733 found = 0; 734 result = NULL; 735 bestver = 0; 736 if (mdp->d_hints == NULL) 737 goto bad; 738 recptr = mdp->d_hints; 739 bufend = recptr + mdp->d_hintsz; 740 clen = blen = 0; 741 best = cp = NULL; 742 while (recptr < bufend && !found) { 743 intp = (int*)recptr; 744 reclen = *intp++; 745 ival = *intp++; 746 cp = (char*)intp; 747 switch (ival) { 748 case MDT_VERSION: 749 clen = *cp++; 750 if (clen != modnamelen || bcmp(cp, modname, clen) != 0) 751 break; 752 cp += clen; 753 INT_ALIGN(mdp->d_hints, cp); 754 ival = *(int*)cp; 755 cp += sizeof(int); 756 clen = *cp++; 757 if (verinfo == NULL || ival == verinfo->md_ver_preferred) { 758 found = 1; 759 break; 760 } 761 if (ival >= verinfo->md_ver_minimum && 762 ival <= verinfo->md_ver_maximum && 763 ival > bestver) { 764 bestver = ival; 765 best = cp; 766 blen = clen; 767 } 768 break; 769 default: 770 break; 771 } 772 recptr += reclen + sizeof(int); 773 } 774 /* 775 * Finally check if KLD is in the place 776 */ 777 if (found) 778 result = file_lookup(mdp->d_path, cp, clen, NULL); 779 else if (best) 780 result = file_lookup(mdp->d_path, best, blen, NULL); 781bad: 782 /* 783 * If nothing found or hints is absent - fallback to the old way 784 * by using "kldname[.ko]" as module name. 785 */ 786 if (!found && !bestver && result == NULL) 787 result = file_lookup(mdp->d_path, modname, modnamelen, kld_ext_list); 788 return result; 789} 790 791/* 792 * Attempt to locate the file containing the module (name) 793 */ 794static char * 795mod_searchmodule(char *name, struct mod_depend *verinfo) 796{ 797 struct moduledir *mdp; 798 char *result; 799 800 moduledir_rebuild(); 801 /* 802 * Now we ready to lookup module in the given directories 803 */ 804 result = NULL; 805 STAILQ_FOREACH(mdp, &moduledir_list, d_link) { 806 result = mod_search_hints(mdp, name, verinfo); 807 if (result) 808 break; 809 } 810 811 return(result); 812} 813 814int 815file_addmodule(struct preloaded_file *fp, char *modname, int version, 816 struct kernel_module **newmp) 817{ 818 struct kernel_module *mp; 819 struct mod_depend mdepend; 820 821 bzero(&mdepend, sizeof(mdepend)); 822 mdepend.md_ver_preferred = version; 823 mp = file_findmodule(fp, modname, &mdepend); 824 if (mp) 825 return (EEXIST); 826 mp = malloc(sizeof(struct kernel_module)); 827 if (mp == NULL) 828 return (ENOMEM); 829 bzero(mp, sizeof(struct kernel_module)); 830 mp->m_name = strdup(modname); 831 mp->m_version = version; 832 mp->m_fp = fp; 833 mp->m_next = fp->f_modules; 834 fp->f_modules = mp; 835 if (newmp) 836 *newmp = mp; 837 return (0); 838} 839 840/* 841 * Throw a file away 842 */ 843void 844file_discard(struct preloaded_file *fp) 845{ 846 struct file_metadata *md, *md1; 847 struct kernel_module *mp, *mp1; 848 if (fp == NULL) 849 return; 850 md = fp->f_metadata; 851 while (md) { 852 md1 = md; 853 md = md->md_next; 854 free(md1); 855 } 856 mp = fp->f_modules; 857 while (mp) { 858 if (mp->m_name) 859 free(mp->m_name); 860 mp1 = mp; 861 mp = mp->m_next; 862 free(mp1); 863 } 864 if (fp->f_name != NULL) 865 free(fp->f_name); 866 if (fp->f_type != NULL) 867 free(fp->f_type); 868 if (fp->f_args != NULL) 869 free(fp->f_args); 870 free(fp); 871} 872 873/* 874 * Allocate a new file; must be used instead of malloc() 875 * to ensure safe initialisation. 876 */ 877struct preloaded_file * 878file_alloc(void) 879{ 880 struct preloaded_file *fp; 881 882 if ((fp = malloc(sizeof(struct preloaded_file))) != NULL) { 883 bzero(fp, sizeof(struct preloaded_file)); 884 } 885 return (fp); 886} 887 888/* 889 * Add a module to the chain 890 */ 891static void 892file_insert_tail(struct preloaded_file *fp) 893{ 894 struct preloaded_file *cm; 895 896 /* Append to list of loaded file */ 897 fp->f_next = NULL; 898 if (preloaded_files == NULL) { 899 preloaded_files = fp; 900 } else { 901 for (cm = preloaded_files; cm->f_next != NULL; cm = cm->f_next) 902 ; 903 cm->f_next = fp; 904 } 905} 906 907static char * 908moduledir_fullpath(struct moduledir *mdp, const char *fname) 909{ 910 char *cp; 911 912 cp = malloc(strlen(mdp->d_path) + strlen(fname) + 2); 913 if (cp == NULL) 914 return NULL; 915 strcpy(cp, mdp->d_path); 916 strcat(cp, "/"); 917 strcat(cp, fname); 918 return (cp); 919} 920 921/* 922 * Read linker.hints file into memory performing some sanity checks. 923 */ 924static void 925moduledir_readhints(struct moduledir *mdp) 926{ 927 struct stat st; 928 char *path; 929 int fd, size, version; 930 931 if (mdp->d_hints != NULL || (mdp->d_flags & MDIR_NOHINTS)) 932 return; 933 path = moduledir_fullpath(mdp, "linker.hints"); 934 if (stat(path, &st) != 0 || 935 st.st_size < (ssize_t)(sizeof(version) + sizeof(int)) || 936 st.st_size > 100 * 1024 || (fd = open(path, O_RDONLY)) < 0) { 937 free(path); 938 mdp->d_flags |= MDIR_NOHINTS; 939 return; 940 } 941 free(path); 942 size = read(fd, &version, sizeof(version)); 943 if (size != sizeof(version) || version != LINKER_HINTS_VERSION) 944 goto bad; 945 size = st.st_size - size; 946 mdp->d_hints = malloc(size); 947 if (mdp->d_hints == NULL) 948 goto bad; 949 if (read(fd, mdp->d_hints, size) != size) 950 goto bad; 951 mdp->d_hintsz = size; 952 close(fd); 953 return; 954bad: 955 close(fd); 956 if (mdp->d_hints) { 957 free(mdp->d_hints); 958 mdp->d_hints = NULL; 959 } 960 mdp->d_flags |= MDIR_NOHINTS; 961 return; 962} 963 964/* 965 * Extract directories from the ';' separated list, remove duplicates. 966 */ 967static void 968moduledir_rebuild(void) 969{ 970 struct moduledir *mdp, *mtmp; 971 const char *path, *cp, *ep; 972 size_t cplen; 973 974 path = getenv("module_path"); 975 if (path == NULL) 976 path = default_searchpath; 977 /* 978 * Rebuild list of module directories if it changed 979 */ 980 STAILQ_FOREACH(mdp, &moduledir_list, d_link) 981 mdp->d_flags |= MDIR_REMOVED; 982 983 for (ep = path; *ep != 0; ep++) { 984 cp = ep; 985 for (; *ep != 0 && *ep != ';'; ep++) 986 ; 987 /* 988 * Ignore trailing slashes 989 */ 990 for (cplen = ep - cp; cplen > 1 && cp[cplen - 1] == '/'; cplen--) 991 ; 992 STAILQ_FOREACH(mdp, &moduledir_list, d_link) { 993 if (strlen(mdp->d_path) != cplen || bcmp(cp, mdp->d_path, cplen) != 0) 994 continue; 995 mdp->d_flags &= ~MDIR_REMOVED; 996 break; 997 } 998 if (mdp == NULL) { 999 mdp = malloc(sizeof(*mdp) + cplen + 1); 1000 if (mdp == NULL) 1001 return; 1002 mdp->d_path = (char*)(mdp + 1); 1003 bcopy(cp, mdp->d_path, cplen); 1004 mdp->d_path[cplen] = 0; 1005 mdp->d_hints = NULL; 1006 mdp->d_flags = 0; 1007 STAILQ_INSERT_TAIL(&moduledir_list, mdp, d_link); 1008 } 1009 if (*ep == 0) 1010 break; 1011 } 1012 /* 1013 * Delete unused directories if any 1014 */ 1015 mdp = STAILQ_FIRST(&moduledir_list); 1016 while (mdp) { 1017 if ((mdp->d_flags & MDIR_REMOVED) == 0) { 1018 mdp = STAILQ_NEXT(mdp, d_link); 1019 } else { 1020 if (mdp->d_hints) 1021 free(mdp->d_hints); 1022 mtmp = mdp; 1023 mdp = STAILQ_NEXT(mdp, d_link); 1024 STAILQ_REMOVE(&moduledir_list, mtmp, moduledir, d_link); 1025 free(mtmp); 1026 } 1027 } 1028 return; 1029} 1030