module.c revision 294985
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 294985 2016-01-28 12:23:25Z 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_CRIT); 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_CRIT); 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_WARN); 147 } 148 149 if (file_loadraw(argv[1], typestr, 1) != NULL) 150 return (CMD_OK); 151 152 /* Failing to load mfs_root is never going to end well! */ 153 if (strcmp("mfs_root", typestr) == 0) 154 return (CMD_FATAL); 155 156 return (CMD_ERROR); 157 } 158 /* 159 * Do we have explicit KLD load ? 160 */ 161 if (dokld || file_havepath(argv[1])) { 162 error = mod_loadkld(argv[1], argc - 2, argv + 2); 163 if (error == EEXIST) { 164 sprintf(command_errbuf, "warning: KLD '%s' already loaded", argv[1]); 165 return (CMD_WARN); 166 } 167 168 return (error == 0 ? CMD_OK : CMD_CRIT); 169 } 170 /* 171 * Looks like a request for a module. 172 */ 173 error = mod_load(argv[1], NULL, argc - 2, argv + 2); 174 if (error == EEXIST) { 175 sprintf(command_errbuf, "warning: module '%s' already loaded", argv[1]); 176 return (CMD_WARN); 177 } 178 179 return (error == 0 ? CMD_OK : CMD_CRIT); 180} 181 182COMMAND_SET(load_geli, "load_geli", "load a geli key", command_load_geli); 183 184static int 185command_load_geli(int argc, char *argv[]) 186{ 187 char typestr[80]; 188 char *cp; 189 int ch, num; 190 191 if (argc < 3) { 192 command_errmsg = "usage is [-n key#] <prov> <file>"; 193 return(CMD_ERROR); 194 } 195 196 num = 0; 197 optind = 1; 198 optreset = 1; 199 while ((ch = getopt(argc, argv, "n:")) != -1) { 200 switch(ch) { 201 case 'n': 202 num = strtol(optarg, &cp, 0); 203 if (cp == optarg) { 204 sprintf(command_errbuf, "bad key index '%s'", optarg); 205 return(CMD_ERROR); 206 } 207 break; 208 case '?': 209 default: 210 /* getopt has already reported an error */ 211 return(CMD_OK); 212 } 213 } 214 argv += (optind - 1); 215 argc -= (optind - 1); 216 sprintf(typestr, "%s:geli_keyfile%d", argv[1], num); 217 return (file_loadraw(argv[2], typestr, 1) ? CMD_OK : CMD_ERROR); 218} 219 220COMMAND_SET(unload, "unload", "unload all modules", command_unload); 221 222static int 223command_unload(int argc, char *argv[]) 224{ 225 struct preloaded_file *fp; 226 227 while (preloaded_files != NULL) { 228 fp = preloaded_files; 229 preloaded_files = preloaded_files->f_next; 230 file_discard(fp); 231 } 232 loadaddr = 0; 233 unsetenv("kernelname"); 234 return(CMD_OK); 235} 236 237COMMAND_SET(lsmod, "lsmod", "list loaded modules", command_lsmod); 238 239static int 240command_lsmod(int argc, char *argv[]) 241{ 242 struct preloaded_file *fp; 243 struct kernel_module *mp; 244 struct file_metadata *md; 245 char lbuf[80]; 246 int ch, verbose; 247 248 verbose = 0; 249 optind = 1; 250 optreset = 1; 251 while ((ch = getopt(argc, argv, "v")) != -1) { 252 switch(ch) { 253 case 'v': 254 verbose = 1; 255 break; 256 case '?': 257 default: 258 /* getopt has already reported an error */ 259 return(CMD_OK); 260 } 261 } 262 263 pager_open(); 264 for (fp = preloaded_files; fp; fp = fp->f_next) { 265 sprintf(lbuf, " %p: %s (%s, 0x%lx)\n", 266 (void *) fp->f_addr, fp->f_name, fp->f_type, (long) fp->f_size); 267 pager_output(lbuf); 268 if (fp->f_args != NULL) { 269 pager_output(" args: "); 270 pager_output(fp->f_args); 271 pager_output("\n"); 272 } 273 if (fp->f_modules) { 274 pager_output(" modules: "); 275 for (mp = fp->f_modules; mp; mp = mp->m_next) { 276 sprintf(lbuf, "%s.%d ", mp->m_name, mp->m_version); 277 pager_output(lbuf); 278 } 279 pager_output("\n"); 280 } 281 if (verbose) { 282 /* XXX could add some formatting smarts here to display some better */ 283 for (md = fp->f_metadata; md != NULL; md = md->md_next) { 284 sprintf(lbuf, " 0x%04x, 0x%lx\n", md->md_type, (long) md->md_size); 285 pager_output(lbuf); 286 } 287 } 288 } 289 pager_close(); 290 return(CMD_OK); 291} 292 293/* 294 * File level interface, functions file_* 295 */ 296int 297file_load(char *filename, vm_offset_t dest, struct preloaded_file **result) 298{ 299 static int last_file_format = 0; 300 struct preloaded_file *fp; 301 int error; 302 int i; 303 304 if (archsw.arch_loadaddr != NULL) 305 dest = archsw.arch_loadaddr(LOAD_RAW, filename, dest); 306 307 error = EFTYPE; 308 for (i = last_file_format, fp = NULL; 309 file_formats[i] && fp == NULL; i++) { 310 error = (file_formats[i]->l_load)(filename, dest, &fp); 311 if (error == 0) { 312 fp->f_loader = last_file_format = i; /* remember the loader */ 313 *result = fp; 314 break; 315 } else if (last_file_format == i && i != 0) { 316 /* Restart from the beginning */ 317 i = -1; 318 last_file_format = 0; 319 fp = NULL; 320 continue; 321 } 322 if (error == EFTYPE) 323 continue; /* Unknown to this handler? */ 324 if (error) { 325 sprintf(command_errbuf, "can't load file '%s': %s", 326 filename, strerror(error)); 327 break; 328 } 329 } 330 return (error); 331} 332 333static int 334file_load_dependencies(struct preloaded_file *base_file) 335{ 336 struct file_metadata *md; 337 struct preloaded_file *fp; 338 struct mod_depend *verinfo; 339 struct kernel_module *mp; 340 char *dmodname; 341 int error; 342 343 md = file_findmetadata(base_file, MODINFOMD_DEPLIST); 344 if (md == NULL) 345 return (0); 346 error = 0; 347 do { 348 verinfo = (struct mod_depend*)md->md_data; 349 dmodname = (char *)(verinfo + 1); 350 if (file_findmodule(NULL, dmodname, verinfo) == NULL) { 351 printf("loading required module '%s'\n", dmodname); 352 error = mod_load(dmodname, verinfo, 0, NULL); 353 if (error) 354 break; 355 /* 356 * If module loaded via kld name which isn't listed 357 * in the linker.hints file, we should check if it have 358 * required version. 359 */ 360 mp = file_findmodule(NULL, dmodname, verinfo); 361 if (mp == NULL) { 362 sprintf(command_errbuf, "module '%s' exists but with wrong version", 363 dmodname); 364 error = ENOENT; 365 break; 366 } 367 } 368 md = metadata_next(md, MODINFOMD_DEPLIST); 369 } while (md); 370 if (!error) 371 return (0); 372 /* Load failed; discard everything */ 373 while (base_file != NULL) { 374 fp = base_file; 375 base_file = base_file->f_next; 376 file_discard(fp); 377 } 378 return (error); 379} 380 381/* 382 * We've been asked to load (fname) as (type), so just suck it in, 383 * no arguments or anything. 384 */ 385struct preloaded_file * 386file_loadraw(const char *fname, char *type, int insert) 387{ 388 struct preloaded_file *fp; 389 char *name; 390 int fd, got; 391 vm_offset_t laddr; 392 393 /* We can't load first */ 394 if ((file_findfile(NULL, NULL)) == NULL) { 395 command_errmsg = "can't load file before kernel"; 396 return(NULL); 397 } 398 399 /* locate the file on the load path */ 400 name = file_search(fname, NULL); 401 if (name == NULL) { 402 sprintf(command_errbuf, "can't find '%s'", fname); 403 return(NULL); 404 } 405 406 if ((fd = open(name, O_RDONLY)) < 0) { 407 sprintf(command_errbuf, "can't open '%s': %s", name, strerror(errno)); 408 free(name); 409 return(NULL); 410 } 411 412 if (archsw.arch_loadaddr != NULL) 413 loadaddr = archsw.arch_loadaddr(LOAD_RAW, name, loadaddr); 414 415 laddr = loadaddr; 416 for (;;) { 417 /* read in 4k chunks; size is not really important */ 418 got = archsw.arch_readin(fd, laddr, 4096); 419 if (got == 0) /* end of file */ 420 break; 421 if (got < 0) { /* error */ 422 sprintf(command_errbuf, "error reading '%s': %s", name, strerror(errno)); 423 free(name); 424 close(fd); 425 return(NULL); 426 } 427 laddr += got; 428 } 429 430 /* Looks OK so far; create & populate control structure */ 431 fp = file_alloc(); 432 fp->f_name = strdup(name); 433 fp->f_type = strdup(type); 434 fp->f_args = NULL; 435 fp->f_metadata = NULL; 436 fp->f_loader = -1; 437 fp->f_addr = loadaddr; 438 fp->f_size = laddr - loadaddr; 439 440 /* recognise space consumption */ 441 loadaddr = laddr; 442 443 /* Add to the list of loaded files */ 444 if (insert != 0) 445 file_insert_tail(fp); 446 close(fd); 447 return(fp); 448} 449 450/* 451 * Load the module (name), pass it (argc),(argv), add container file 452 * to the list of loaded files. 453 * If module is already loaded just assign new argc/argv. 454 */ 455int 456mod_load(char *modname, struct mod_depend *verinfo, int argc, char *argv[]) 457{ 458 struct kernel_module *mp; 459 int err; 460 char *filename; 461 462 if (file_havepath(modname)) { 463 printf("Warning: mod_load() called instead of mod_loadkld() for module '%s'\n", modname); 464 return (mod_loadkld(modname, argc, argv)); 465 } 466 /* see if module is already loaded */ 467 mp = file_findmodule(NULL, modname, verinfo); 468 if (mp) { 469#ifdef moduleargs 470 if (mp->m_args) 471 free(mp->m_args); 472 mp->m_args = unargv(argc, argv); 473#endif 474 sprintf(command_errbuf, "warning: module '%s' already loaded", mp->m_name); 475 return (0); 476 } 477 /* locate file with the module on the search path */ 478 filename = mod_searchmodule(modname, verinfo); 479 if (filename == NULL) { 480 sprintf(command_errbuf, "can't find '%s'", modname); 481 return (ENOENT); 482 } 483 err = mod_loadkld(filename, argc, argv); 484 return (err); 485} 486 487/* 488 * Load specified KLD. If path is omitted, then try to locate it via 489 * search path. 490 */ 491int 492mod_loadkld(const char *kldname, int argc, char *argv[]) 493{ 494 struct preloaded_file *fp, *last_file; 495 int err; 496 char *filename; 497 498 /* 499 * Get fully qualified KLD name 500 */ 501 filename = file_search(kldname, kld_ext_list); 502 if (filename == NULL) { 503 sprintf(command_errbuf, "can't find '%s'", kldname); 504 return (ENOENT); 505 } 506 /* 507 * Check if KLD already loaded 508 */ 509 fp = file_findfile(filename, NULL); 510 if (fp) { 511 sprintf(command_errbuf, "warning: KLD '%s' already loaded", filename); 512 free(filename); 513 return (0); 514 } 515 for (last_file = preloaded_files; 516 last_file != NULL && last_file->f_next != NULL; 517 last_file = last_file->f_next) 518 ; 519 520 do { 521 err = file_load(filename, loadaddr, &fp); 522 if (err) 523 break; 524 fp->f_args = unargv(argc, argv); 525 loadaddr = fp->f_addr + fp->f_size; 526 file_insert_tail(fp); /* Add to the list of loaded files */ 527 if (file_load_dependencies(fp) != 0) { 528 err = ENOENT; 529 last_file->f_next = NULL; 530 loadaddr = last_file->f_addr + last_file->f_size; 531 fp = NULL; 532 break; 533 } 534 } while(0); 535 if (err == EFTYPE) 536 sprintf(command_errbuf, "don't know how to load module '%s'", filename); 537 if (err && fp) 538 file_discard(fp); 539 free(filename); 540 return (err); 541} 542 543/* 544 * Find a file matching (name) and (type). 545 * NULL may be passed as a wildcard to either. 546 */ 547struct preloaded_file * 548file_findfile(const char *name, const char *type) 549{ 550 struct preloaded_file *fp; 551 552 for (fp = preloaded_files; fp != NULL; fp = fp->f_next) { 553 if (((name == NULL) || !strcmp(name, fp->f_name)) && 554 ((type == NULL) || !strcmp(type, fp->f_type))) 555 break; 556 } 557 return (fp); 558} 559 560/* 561 * Find a module matching (name) inside of given file. 562 * NULL may be passed as a wildcard. 563 */ 564struct kernel_module * 565file_findmodule(struct preloaded_file *fp, char *modname, 566 struct mod_depend *verinfo) 567{ 568 struct kernel_module *mp, *best; 569 int bestver, mver; 570 571 if (fp == NULL) { 572 for (fp = preloaded_files; fp; fp = fp->f_next) { 573 mp = file_findmodule(fp, modname, verinfo); 574 if (mp) 575 return (mp); 576 } 577 return (NULL); 578 } 579 best = NULL; 580 bestver = 0; 581 for (mp = fp->f_modules; mp; mp = mp->m_next) { 582 if (strcmp(modname, mp->m_name) == 0) { 583 if (verinfo == NULL) 584 return (mp); 585 mver = mp->m_version; 586 if (mver == verinfo->md_ver_preferred) 587 return (mp); 588 if (mver >= verinfo->md_ver_minimum && 589 mver <= verinfo->md_ver_maximum && 590 mver > bestver) { 591 best = mp; 592 bestver = mver; 593 } 594 } 595 } 596 return (best); 597} 598/* 599 * Make a copy of (size) bytes of data from (p), and associate them as 600 * metadata of (type) to the module (mp). 601 */ 602void 603file_addmetadata(struct preloaded_file *fp, int type, size_t size, void *p) 604{ 605 struct file_metadata *md; 606 607 md = malloc(sizeof(struct file_metadata) - sizeof(md->md_data) + size); 608 md->md_size = size; 609 md->md_type = type; 610 bcopy(p, md->md_data, size); 611 md->md_next = fp->f_metadata; 612 fp->f_metadata = md; 613} 614 615/* 616 * Find a metadata object of (type) associated with the file (fp) 617 */ 618struct file_metadata * 619file_findmetadata(struct preloaded_file *fp, int type) 620{ 621 struct file_metadata *md; 622 623 for (md = fp->f_metadata; md != NULL; md = md->md_next) 624 if (md->md_type == type) 625 break; 626 return(md); 627} 628 629struct file_metadata * 630metadata_next(struct file_metadata *md, int type) 631{ 632 if (md == NULL) 633 return (NULL); 634 while((md = md->md_next) != NULL) 635 if (md->md_type == type) 636 break; 637 return (md); 638} 639 640static char *emptyextlist[] = { "", NULL }; 641 642/* 643 * Check if the given file is in place and return full path to it. 644 */ 645static char * 646file_lookup(const char *path, const char *name, int namelen, char **extlist) 647{ 648 struct stat st; 649 char *result, *cp, **cpp; 650 int pathlen, extlen, len; 651 652 pathlen = strlen(path); 653 extlen = 0; 654 if (extlist == NULL) 655 extlist = emptyextlist; 656 for (cpp = extlist; *cpp; cpp++) { 657 len = strlen(*cpp); 658 if (len > extlen) 659 extlen = len; 660 } 661 result = malloc(pathlen + namelen + extlen + 2); 662 if (result == NULL) 663 return (NULL); 664 bcopy(path, result, pathlen); 665 if (pathlen > 0 && result[pathlen - 1] != '/') 666 result[pathlen++] = '/'; 667 cp = result + pathlen; 668 bcopy(name, cp, namelen); 669 cp += namelen; 670 for (cpp = extlist; *cpp; cpp++) { 671 strcpy(cp, *cpp); 672 if (stat(result, &st) == 0 && S_ISREG(st.st_mode)) 673 return result; 674 } 675 free(result); 676 return NULL; 677} 678 679/* 680 * Check if file name have any qualifiers 681 */ 682static int 683file_havepath(const char *name) 684{ 685 const char *cp; 686 687 archsw.arch_getdev(NULL, name, &cp); 688 return (cp != name || strchr(name, '/') != NULL); 689} 690 691/* 692 * Attempt to find the file (name) on the module searchpath. 693 * If (name) is qualified in any way, we simply check it and 694 * return it or NULL. If it is not qualified, then we attempt 695 * to construct a path using entries in the environment variable 696 * module_path. 697 * 698 * The path we return a pointer to need never be freed, as we manage 699 * it internally. 700 */ 701static char * 702file_search(const char *name, char **extlist) 703{ 704 struct moduledir *mdp; 705 struct stat sb; 706 char *result; 707 int namelen; 708 709 /* Don't look for nothing */ 710 if (name == NULL) 711 return(NULL); 712 713 if (*name == 0) 714 return(strdup(name)); 715 716 if (file_havepath(name)) { 717 /* Qualified, so just see if it exists */ 718 if (stat(name, &sb) == 0) 719 return(strdup(name)); 720 return(NULL); 721 } 722 moduledir_rebuild(); 723 result = NULL; 724 namelen = strlen(name); 725 STAILQ_FOREACH(mdp, &moduledir_list, d_link) { 726 result = file_lookup(mdp->d_path, name, namelen, extlist); 727 if (result) 728 break; 729 } 730 return(result); 731} 732 733#define INT_ALIGN(base, ptr) ptr = \ 734 (base) + (((ptr) - (base) + sizeof(int) - 1) & ~(sizeof(int) - 1)) 735 736static char * 737mod_search_hints(struct moduledir *mdp, const char *modname, 738 struct mod_depend *verinfo) 739{ 740 u_char *cp, *recptr, *bufend, *best; 741 char *result; 742 int *intp, bestver, blen, clen, found, ival, modnamelen, reclen; 743 744 moduledir_readhints(mdp); 745 modnamelen = strlen(modname); 746 found = 0; 747 result = NULL; 748 bestver = 0; 749 if (mdp->d_hints == NULL) 750 goto bad; 751 recptr = mdp->d_hints; 752 bufend = recptr + mdp->d_hintsz; 753 clen = blen = 0; 754 best = cp = NULL; 755 while (recptr < bufend && !found) { 756 intp = (int*)recptr; 757 reclen = *intp++; 758 ival = *intp++; 759 cp = (char*)intp; 760 switch (ival) { 761 case MDT_VERSION: 762 clen = *cp++; 763 if (clen != modnamelen || bcmp(cp, modname, clen) != 0) 764 break; 765 cp += clen; 766 INT_ALIGN(mdp->d_hints, cp); 767 ival = *(int*)cp; 768 cp += sizeof(int); 769 clen = *cp++; 770 if (verinfo == NULL || ival == verinfo->md_ver_preferred) { 771 found = 1; 772 break; 773 } 774 if (ival >= verinfo->md_ver_minimum && 775 ival <= verinfo->md_ver_maximum && 776 ival > bestver) { 777 bestver = ival; 778 best = cp; 779 blen = clen; 780 } 781 break; 782 default: 783 break; 784 } 785 recptr += reclen + sizeof(int); 786 } 787 /* 788 * Finally check if KLD is in the place 789 */ 790 if (found) 791 result = file_lookup(mdp->d_path, cp, clen, NULL); 792 else if (best) 793 result = file_lookup(mdp->d_path, best, blen, NULL); 794bad: 795 /* 796 * If nothing found or hints is absent - fallback to the old way 797 * by using "kldname[.ko]" as module name. 798 */ 799 if (!found && !bestver && result == NULL) 800 result = file_lookup(mdp->d_path, modname, modnamelen, kld_ext_list); 801 return result; 802} 803 804/* 805 * Attempt to locate the file containing the module (name) 806 */ 807static char * 808mod_searchmodule(char *name, struct mod_depend *verinfo) 809{ 810 struct moduledir *mdp; 811 char *result; 812 813 moduledir_rebuild(); 814 /* 815 * Now we ready to lookup module in the given directories 816 */ 817 result = NULL; 818 STAILQ_FOREACH(mdp, &moduledir_list, d_link) { 819 result = mod_search_hints(mdp, name, verinfo); 820 if (result) 821 break; 822 } 823 824 return(result); 825} 826 827int 828file_addmodule(struct preloaded_file *fp, char *modname, int version, 829 struct kernel_module **newmp) 830{ 831 struct kernel_module *mp; 832 struct mod_depend mdepend; 833 834 bzero(&mdepend, sizeof(mdepend)); 835 mdepend.md_ver_preferred = version; 836 mp = file_findmodule(fp, modname, &mdepend); 837 if (mp) 838 return (EEXIST); 839 mp = malloc(sizeof(struct kernel_module)); 840 if (mp == NULL) 841 return (ENOMEM); 842 bzero(mp, sizeof(struct kernel_module)); 843 mp->m_name = strdup(modname); 844 mp->m_version = version; 845 mp->m_fp = fp; 846 mp->m_next = fp->f_modules; 847 fp->f_modules = mp; 848 if (newmp) 849 *newmp = mp; 850 return (0); 851} 852 853/* 854 * Throw a file away 855 */ 856void 857file_discard(struct preloaded_file *fp) 858{ 859 struct file_metadata *md, *md1; 860 struct kernel_module *mp, *mp1; 861 if (fp == NULL) 862 return; 863 md = fp->f_metadata; 864 while (md) { 865 md1 = md; 866 md = md->md_next; 867 free(md1); 868 } 869 mp = fp->f_modules; 870 while (mp) { 871 if (mp->m_name) 872 free(mp->m_name); 873 mp1 = mp; 874 mp = mp->m_next; 875 free(mp1); 876 } 877 if (fp->f_name != NULL) 878 free(fp->f_name); 879 if (fp->f_type != NULL) 880 free(fp->f_type); 881 if (fp->f_args != NULL) 882 free(fp->f_args); 883 free(fp); 884} 885 886/* 887 * Allocate a new file; must be used instead of malloc() 888 * to ensure safe initialisation. 889 */ 890struct preloaded_file * 891file_alloc(void) 892{ 893 struct preloaded_file *fp; 894 895 if ((fp = malloc(sizeof(struct preloaded_file))) != NULL) { 896 bzero(fp, sizeof(struct preloaded_file)); 897 } 898 return (fp); 899} 900 901/* 902 * Add a module to the chain 903 */ 904static void 905file_insert_tail(struct preloaded_file *fp) 906{ 907 struct preloaded_file *cm; 908 909 /* Append to list of loaded file */ 910 fp->f_next = NULL; 911 if (preloaded_files == NULL) { 912 preloaded_files = fp; 913 } else { 914 for (cm = preloaded_files; cm->f_next != NULL; cm = cm->f_next) 915 ; 916 cm->f_next = fp; 917 } 918} 919 920static char * 921moduledir_fullpath(struct moduledir *mdp, const char *fname) 922{ 923 char *cp; 924 925 cp = malloc(strlen(mdp->d_path) + strlen(fname) + 2); 926 if (cp == NULL) 927 return NULL; 928 strcpy(cp, mdp->d_path); 929 strcat(cp, "/"); 930 strcat(cp, fname); 931 return (cp); 932} 933 934/* 935 * Read linker.hints file into memory performing some sanity checks. 936 */ 937static void 938moduledir_readhints(struct moduledir *mdp) 939{ 940 struct stat st; 941 char *path; 942 int fd, size, version; 943 944 if (mdp->d_hints != NULL || (mdp->d_flags & MDIR_NOHINTS)) 945 return; 946 path = moduledir_fullpath(mdp, "linker.hints"); 947 if (stat(path, &st) != 0 || 948 st.st_size < (ssize_t)(sizeof(version) + sizeof(int)) || 949 st.st_size > 100 * 1024 || (fd = open(path, O_RDONLY)) < 0) { 950 free(path); 951 mdp->d_flags |= MDIR_NOHINTS; 952 return; 953 } 954 free(path); 955 size = read(fd, &version, sizeof(version)); 956 if (size != sizeof(version) || version != LINKER_HINTS_VERSION) 957 goto bad; 958 size = st.st_size - size; 959 mdp->d_hints = malloc(size); 960 if (mdp->d_hints == NULL) 961 goto bad; 962 if (read(fd, mdp->d_hints, size) != size) 963 goto bad; 964 mdp->d_hintsz = size; 965 close(fd); 966 return; 967bad: 968 close(fd); 969 if (mdp->d_hints) { 970 free(mdp->d_hints); 971 mdp->d_hints = NULL; 972 } 973 mdp->d_flags |= MDIR_NOHINTS; 974 return; 975} 976 977/* 978 * Extract directories from the ';' separated list, remove duplicates. 979 */ 980static void 981moduledir_rebuild(void) 982{ 983 struct moduledir *mdp, *mtmp; 984 const char *path, *cp, *ep; 985 size_t cplen; 986 987 path = getenv("module_path"); 988 if (path == NULL) 989 path = default_searchpath; 990 /* 991 * Rebuild list of module directories if it changed 992 */ 993 STAILQ_FOREACH(mdp, &moduledir_list, d_link) 994 mdp->d_flags |= MDIR_REMOVED; 995 996 for (ep = path; *ep != 0; ep++) { 997 cp = ep; 998 for (; *ep != 0 && *ep != ';'; ep++) 999 ; 1000 /* 1001 * Ignore trailing slashes 1002 */ 1003 for (cplen = ep - cp; cplen > 1 && cp[cplen - 1] == '/'; cplen--) 1004 ; 1005 STAILQ_FOREACH(mdp, &moduledir_list, d_link) { 1006 if (strlen(mdp->d_path) != cplen || bcmp(cp, mdp->d_path, cplen) != 0) 1007 continue; 1008 mdp->d_flags &= ~MDIR_REMOVED; 1009 break; 1010 } 1011 if (mdp == NULL) { 1012 mdp = malloc(sizeof(*mdp) + cplen + 1); 1013 if (mdp == NULL) 1014 return; 1015 mdp->d_path = (char*)(mdp + 1); 1016 bcopy(cp, mdp->d_path, cplen); 1017 mdp->d_path[cplen] = 0; 1018 mdp->d_hints = NULL; 1019 mdp->d_flags = 0; 1020 STAILQ_INSERT_TAIL(&moduledir_list, mdp, d_link); 1021 } 1022 if (*ep == 0) 1023 break; 1024 } 1025 /* 1026 * Delete unused directories if any 1027 */ 1028 mdp = STAILQ_FIRST(&moduledir_list); 1029 while (mdp) { 1030 if ((mdp->d_flags & MDIR_REMOVED) == 0) { 1031 mdp = STAILQ_NEXT(mdp, d_link); 1032 } else { 1033 if (mdp->d_hints) 1034 free(mdp->d_hints); 1035 mtmp = mdp; 1036 mdp = STAILQ_NEXT(mdp, d_link); 1037 STAILQ_REMOVE(&moduledir_list, mtmp, moduledir, d_link); 1038 free(mtmp); 1039 } 1040 } 1041 return; 1042} 1043