kmodloader.c

   1 /*
   2  * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
   3  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License version 2.1
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #define _GNU_SOURCE
  16 #include <sys/syscall.h>
  17 #include <sys/mman.h>
  18 #include <sys/utsname.h>
  19
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22 #include <sys/syscall.h>
  23 #include <sys/types.h>
  24 #include <values.h>
  25 #include <errno.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28 #include <sys/stat.h>
  29 #include <fcntl.h>
  30 #include <libgen.h>
  31 #include <glob.h>
  32 #include <elf.h>
  33 #include <ctype.h>
  34
  35 #include <libubox/avl.h>
  36 #include <libubox/avl-cmp.h>
  37 #include <libubox/utils.h>
  38 #include <libubox/ulog.h>
  39 #include <libubox/kvlist.h>
  40 #include <libubox/list.h>
  41
  42 #define DEF_MOD_PATH "/modules/%s/"
  43 #define MOD_BUILTIN "modules.builtin"
  44 #define MOD_BUILTIN_MODINFO "modules.builtin.modinfo"
  45 /* duplicated from in-kernel include/linux/module.h */
  46 #define MODULE_NAME_LEN (64 - sizeof(unsigned long))
  47
  48 struct param {
  49         char *name;
  50         char *desc;
  51         char *type;
  52         struct list_head list;
  53 };
  54
  55 enum {
  56         BUILTIN,
  57         SCANNED,
  58         PROBE,
  59         LOADED,
  60         BLACKLISTED,
  61 };
  62
  63 struct module {
  64         char *name;
  65         char *depends;
  66         char *opts;
  67
  68         int size;
  69         int usage;
  70         int state;
  71         int error;
  72         int refcnt;                     /* number of references from module_node.m */
  73 };
  74
  75 struct module_node {
  76         struct avl_node avl;
  77         struct module *m;
  78         bool is_alias;
  79 };
  80
  81 static struct avl_tree modules;
  82 static KVLIST(options, kvlist_strlen);
  83
  84 static char **module_folders = NULL;
  85
  86 static void free_module(struct module *m);
  87
  88 static int init_module_folders(void)
  89 {
  90         int n = 0;
  91         struct stat st;
  92         struct utsname ver;
  93         char *s, *e, *p, path[330], ldpath[256];
  94
  95         e = ldpath;
  96         s = getenv("LD_LIBRARY_PATH");
  97
  98         if (s)
  99                 e += snprintf(ldpath, sizeof(ldpath), "%s:", s);
 100
 101         e += snprintf(e, sizeof(ldpath) - (e - ldpath), "/lib");
 102
 103         uname(&ver);
 104
 105         for (s = p = ldpath; p <= e; p++) {
 106                 if (*p != ':' && *p != '\0')
 107                         continue;
 108
 109                 *p = 0;
 110                 snprintf(path, sizeof(path), "%s" DEF_MOD_PATH, s, ver.release);
 111
 112                 if (!stat(path, &st) && S_ISDIR(st.st_mode)) {
 113                         module_folders = realloc(module_folders, sizeof(p) * (n + 2));
 114
 115                         if (!module_folders) {
 116                                 ULOG_ERR("out of memory\n");
 117                                 return -1;
 118                         }
 119
 120                         module_folders[n++] = strdup(path);
 121                 }
 122
 123                 s = p + 1;
 124         }
 125
 126         if (!module_folders) {
 127                 ULOG_ERR("no module folders for kernel version %s found\n", ver.release);
 128                 return -1;
 129         }
 130
 131         module_folders[n] = NULL;
 132         return 0;
 133 }
 134
 135 static struct module *find_module(const char *name)
 136 {
 137         struct module_node *mn;
 138         mn = avl_find_element(&modules, name, mn, avl);
 139         if (mn)
 140                 return mn->m;
 141         else
 142                 return NULL;
 143 }
 144
 145 static void free_modules(void)
 146 {
 147         struct module_node *mn, *tmp;
 148
 149         avl_remove_all_elements(&modules, mn, avl, tmp) {
 150                 struct module *m = mn->m;
 151
 152                 m->refcnt -= 1;
 153                 if (m->refcnt == 0)
 154                         free_module(m);
 155                 free(mn);
 156         }
 157 }
 158
 159 static char* get_module_path(char *name)
 160 {
 161         char **p;
 162         static char path[256];
 163         struct stat s;
 164
 165         if (!stat(name, &s) && S_ISREG(s.st_mode))
 166                 return name;
 167
 168         for (p = module_folders; *p; p++) {
 169                 snprintf(path, sizeof(path), "%s%s.ko", *p, name);
 170                 if (!stat(path, &s) && S_ISREG(s.st_mode))
 171                         return path;
 172         }
 173
 174         return NULL;
 175 }
 176
 177 static char* get_module_name(char *path)
 178 {
 179         static char name[MODULE_NAME_LEN];
 180         char *t;
 181
 182         strncpy(name, basename(path), sizeof(name) - 1);
 183
 184         t = strstr(name, ".ko");
 185         if (t)
 186                 *t = '\0';
 187
 188         return name;
 189 }
 190
 191 static int elf64_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
 192 {
 193         const char *secnames;
 194         Elf64_Ehdr *e;
 195         Elf64_Shdr *sh;
 196         int i;
 197
 198         e = (Elf64_Ehdr *) map;
 199         sh = (Elf64_Shdr *) (map + e->e_shoff);
 200
 201         secnames = map + sh[e->e_shstrndx].sh_offset;
 202         for (i = 0; i < e->e_shnum; i++) {
 203                 if (!strcmp(section, secnames + sh[i].sh_name)) {
 204                         *size = sh[i].sh_size;
 205                         *offset = sh[i].sh_offset;
 206                         return 0;
 207                 }
 208         }
 209
 210         return -1;
 211 }
 212
 213 static int elf32_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
 214 {
 215         const char *secnames;
 216         Elf32_Ehdr *e;
 217         Elf32_Shdr *sh;
 218         int i;
 219
 220         e = (Elf32_Ehdr *) map;
 221         sh = (Elf32_Shdr *) (map + e->e_shoff);
 222
 223         secnames = map + sh[e->e_shstrndx].sh_offset;
 224         for (i = 0; i < e->e_shnum; i++) {
 225                 if (!strcmp(section, secnames + sh[i].sh_name)) {
 226                         *size = sh[i].sh_size;
 227                         *offset = sh[i].sh_offset;
 228                         return 0;
 229                 }
 230         }
 231
 232         return -1;
 233 }
 234
 235 static int elf_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
 236 {
 237         int clazz = map[EI_CLASS];
 238         int endian = map[EI_DATA];
 239
 240 #if __BYTE_ORDER == __LITTLE_ENDIAN
 241         if (endian != ELFDATA2LSB)
 242 #elif __BYTE_ORDER == __BIG_ENDIAN
 243         if (endian != ELFDATA2MSB)
 244 #else
 245 #error "unsupported endian"
 246 #endif
 247         {
 248                 ULOG_ERR("invalid endianess: %d\n", endian);
 249                 return -1;
 250         }
 251
 252         if (clazz == ELFCLASS32)
 253                 return elf32_find_section(map, section, offset, size);
 254         else if (clazz == ELFCLASS64)
 255                 return elf64_find_section(map, section, offset, size);
 256
 257         ULOG_ERR("unknown elf format %d\n", clazz);
 258
 259         return -1;
 260 }
 261
 262 static struct module_node *
 263 alloc_module_node(const char *name, struct module *m, bool is_alias)
 264 {
 265         struct module_node *mn;
 266         char *_name;
 267
 268         mn = calloc_a(sizeof(*mn),
 269                 &_name, strlen(name) + 1);
 270         if (mn) {
 271                 mn->avl.key = strcpy(_name, name);
 272                 mn->m = m;
 273                 mn->is_alias = is_alias;
 274                 avl_insert(&modules, &mn->avl);
 275                 m->refcnt += 1;
 276         }
 277         return mn;
 278 }
 279
 280 static struct module *
 281 alloc_module(const char *name, const char * const *aliases, int naliases, const char *depends, int size)
 282 {
 283         struct module *m;
 284         char *_name, *_dep;
 285         int i;
 286
 287         m = calloc_a(sizeof(*m),
 288                 &_name, strlen(name) + 1,
 289                 &_dep, depends ? strlen(depends) + 2 : 0);
 290         if (!m)
 291                 return NULL;
 292
 293         m->name = strcpy(_name, name);
 294         m->opts = 0;
 295
 296         if (depends) {
 297                 m->depends = strcpy(_dep, depends);
 298                 while (*_dep) {
 299                         if (*_dep == ',')
 300                                 *_dep = '\0';
 301                         _dep++;
 302                 }
 303         }
 304         m->size = size;
 305
 306         m->refcnt = 0;
 307         alloc_module_node(m->name, m, false);
 308         for (i = 0; i < naliases; i++)
 309                 alloc_module_node(aliases[i], m, true);
 310
 311         return m;
 312 }
 313
 314 static void free_module(struct module *m)
 315 {
 316         if (m->opts)
 317                 free(m->opts);
 318         free(m);
 319 }
 320
 321 static int scan_loaded_modules(void)
 322 {
 323         size_t buf_len = 0;
 324         char *buf = NULL;
 325         int rv = -1;
 326         FILE *fp;
 327
 328         fp = fopen("/proc/modules", "r");
 329         if (!fp) {
 330                 ULOG_ERR("failed to open /proc/modules\n");
 331                 return -1;
 332         }
 333
 334         while (getline(&buf, &buf_len, fp) > 0) {
 335                 struct module m;
 336                 struct module *n;
 337
 338                 m.name = strtok(buf, " ");
 339                 m.size = atoi(strtok(NULL, " "));
 340                 m.usage = atoi(strtok(NULL, " "));
 341                 m.depends = strtok(NULL, " ");
 342
 343                 if (!m.name || !m.depends)
 344                         continue;
 345
 346                 n = find_module(m.name);
 347                 if (!n) {
 348                         /* possibly a module outside /lib/modules/<ver>/ */
 349                         n = alloc_module(m.name, NULL, 0, m.depends, m.size);
 350                 }
 351                 if (!n) {
 352                         ULOG_ERR("Failed to allocate memory for module\n");
 353                         goto out;
 354                 }
 355
 356                 n->usage = m.usage;
 357                 n->state = LOADED;
 358         }
 359         rv = 0;
 360 out:
 361         free(buf);
 362         fclose(fp);
 363
 364         return rv;
 365 }
 366
 367 static char *mmap_modinfo(const char *module, const char *name, struct stat *s, unsigned int *offset, unsigned int *size)
 368 {
 369         const bool is_builtin = (module == NULL);
 370         const char *mpath = NULL;
 371         char *map = MAP_FAILED;
 372         char path[350], **f;
 373         int fd = -1;
 374
 375         if (is_builtin)
 376                 for (f = module_folders; *f; f++) {
 377                         snprintf(path, sizeof(path), "%s%s", *f, MOD_BUILTIN_MODINFO);
 378                         if (!stat(path, s) && S_ISREG(s->st_mode)) {
 379                                 mpath = path;
 380                                 break;
 381                         }
 382                 }
 383         else
 384                 mpath = module;
 385
 386         if (!mpath) {
 387                 ULOG_ERR("cannot find modinfo path of module - %s\n", name);
 388                 goto out;
 389         }
 390
 391         fd = open(mpath, O_RDONLY);
 392         if (fd < 0) {
 393                 ULOG_ERR("failed to open %s\n", mpath);
 394                 goto out;
 395         }
 396
 397         if (fstat(fd, s) == -1) {
 398                 ULOG_ERR("failed to stat %s\n", mpath);
 399                 goto out;
 400         }
 401
 402         map = mmap(NULL, s->st_size, PROT_READ, MAP_PRIVATE, fd, 0);
 403         if (map == MAP_FAILED) {
 404                 ULOG_ERR("failed to mmap %s\n", mpath);
 405                 goto out;
 406         }
 407
 408         if (is_builtin) {
 409                 *offset = 0;
 410                 *size = s->st_size;
 411         } else if (elf_find_section(map, ".modinfo", offset, size)) {
 412                 ULOG_ERR("failed to load the .modinfo section from %s\n", mpath);
 413                 munmap(map, s->st_size);
 414                 map = MAP_FAILED;
 415         }
 416
 417 out:
 418         if (fd >= 0)
 419                 close(fd);
 420         return map;
 421 }
 422
 423 static struct module* get_module_info(const char *module, const char *name)
 424 {
 425         const bool is_builtin = (module == NULL);
 426         unsigned int offset, size;
 427         char *map, *strings, *dep = NULL;
 428         const char **aliases = NULL;
 429         const char **aliasesr;
 430         int naliases = 0;
 431         struct module *m = NULL;
 432         struct stat s;
 433
 434         map = mmap_modinfo(module, name, &s, &offset, &size);
 435         if (map == MAP_FAILED)
 436                 goto out;
 437
 438         strings = map + offset;
 439         while (true) {
 440                 char *sep;
 441                 int len;
 442
 443                 while (!strings[0])
 444                         strings++;
 445                 if (strings >= map + offset + size)
 446                         break;
 447                 if (is_builtin) {
 448                         sep = strstr(strings, ".");
 449                         if (!sep)
 450                                 break;
 451                         if (strlen(name) == (sep - strings) &&
 452                             !strncmp(strings, name, sep - strings))
 453                                 strings = sep + 1;
 454                         else
 455                                 goto next_string;
 456                 }
 457                 sep = strstr(strings, "=");
 458                 if (!sep)
 459                         break;
 460                 len = sep - strings;
 461                 sep++;
 462                 if (!strncmp(strings, "depends=", len + 1))
 463                         dep = sep;
 464                 else if (!strncmp(strings, "alias=", len + 1)) {
 465                         aliasesr = realloc(aliases, sizeof(sep) * (naliases + 1));
 466                         if (!aliasesr) {
 467                                 ULOG_ERR("out of memory\n");
 468                                 goto out;
 469                         }
 470
 471                         aliases = aliasesr;
 472                         aliases[naliases++] = sep;
 473                 }
 474 next_string:
 475                 strings = &sep[strlen(sep)];
 476         }
 477
 478         m = alloc_module(name, aliases, naliases, dep, is_builtin ? 0 : s.st_size);
 479
 480         if (m)
 481                 m->state = is_builtin ? BUILTIN : SCANNED;
 482
 483 out:
 484         if (map != MAP_FAILED)
 485                 munmap(map, s.st_size);
 486
 487         free(aliases);
 488
 489         return m;
 490 }
 491
 492 static int scan_builtin_modules(void)
 493 {
 494         char **p, path[350];
 495         size_t buf_len = 0;
 496         char *buf = NULL;
 497         struct stat st;
 498         FILE *fp = NULL;
 499         int rv = -1;
 500
 501         if (!module_folders && init_module_folders())
 502                 return -1;
 503         for (p = module_folders; *p; p++) {
 504                 snprintf(path, sizeof(path), "%s%s", *p, MOD_BUILTIN);
 505                 fp = fopen(path, "r");
 506                 if (!fp)
 507                         continue;
 508
 509                 if (!fstat(fileno(fp), &st) && S_ISREG(st.st_mode))
 510                         break;
 511
 512                 /* Not regular file, close it and check next */
 513                 fclose(fp);
 514                 fp = NULL;
 515         }
 516         if (!fp)
 517                 return 0;       /* OK if modules.builtin unavailable */
 518
 519         while (getline(&buf, &buf_len, fp) > 0) {
 520                 struct module *m;
 521                 char *name;
 522
 523                 name = get_module_name(buf);
 524                 if (!name)
 525                         continue;
 526                 m = find_module(name);
 527                 if (m && !strcmp(m->name, name)) {
 528                         ULOG_WARN("found duplicate builtin module %s\n", name);
 529                         continue;
 530                 }
 531                 m = get_module_info(NULL, name);
 532                 if (!m) {
 533                         ULOG_ERR("failed to find info for builtin module %s\n", name);
 534                         goto err;
 535                 }
 536         }
 537
 538         rv = 0;
 539 err:
 540         free(buf);
 541         fclose(fp);
 542
 543         return rv;
 544 }
 545
 546 static int scan_module_folder(const char *dir)
 547 {
 548         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 549         char *path;
 550         glob_t gl;
 551         int j, rv = 0;
 552
 553         path = alloca(strlen(dir) + sizeof("*.ko") + 1);
 554         sprintf(path, "%s*.ko", dir);
 555
 556         if (glob(path, gl_flags, NULL, &gl) < 0)
 557                 return -1;
 558
 559         for (j = 0; j < gl.gl_pathc; j++) {
 560                 char *name = get_module_name(gl.gl_pathv[j]);
 561                 struct module *m;
 562                 char *opts;
 563
 564                 if (!name)
 565                         continue;
 566
 567                 m = find_module(name);
 568                 if (m)
 569                         continue;
 570
 571                 m = get_module_info(gl.gl_pathv[j], name);
 572                 if (!m) {
 573                         rv |= -1;
 574                         continue;
 575                 }
 576
 577                 opts = kvlist_get(&options, name);
 578                 if (!opts)
 579                         continue;
 580
 581                 if (*opts == '\x01')
 582                         m->state = BLACKLISTED;
 583                 else
 584                         m->opts = strdup(opts);
 585         }
 586
 587         globfree(&gl);
 588
 589         return rv;
 590 }
 591
 592 static int scan_module_folders(void)
 593 {
 594         int rv = 0;
 595         char **p;
 596
 597         if (init_module_folders())
 598                 return -1;
 599
 600         for (p = module_folders; *p; p++)
 601                 rv |= scan_module_folder(*p);
 602
 603         return rv;
 604 }
 605
 606 static int print_modinfo(const struct module *m)
 607 {
 608         const bool is_builtin = (m->state == BUILTIN);
 609         unsigned int offset, size;
 610         struct param *p;
 611         struct stat s;
 612         char *map, *strings, *mpath;
 613         int rv = -1;
 614
 615         LIST_HEAD(params);
 616
 617         mpath = get_module_path(m->name);
 618         map = mmap_modinfo(mpath, m->name, &s, &offset, &size);
 619         if (map == MAP_FAILED)
 620                 goto out;
 621
 622         strings = map + offset;
 623         if (is_builtin)
 624                 printf("name:\t\t%s\n", m->name);
 625         printf("filename:\t%s\n", is_builtin ? "(builtin)" : mpath);
 626         while (true) {
 627                 char *pname, *pdata;
 628                 char *dup = NULL;
 629                 char *sep, *sep2;
 630
 631                 while (!strings[0])
 632                         strings++;
 633                 if (strings >= map + offset + size)
 634                         break;
 635                 if (is_builtin) {
 636                         sep = strstr(strings, ".");
 637                         if (!sep)
 638                                 break;
 639                         if (strlen(m->name) == (sep - strings) &&
 640                             !strncmp(strings, m->name, sep - strings))
 641                                 strings = sep + 1;
 642                         else
 643                                 goto next_string;
 644                 }
 645                 sep = strstr(strings, "=");
 646                 if (!sep)
 647                         break;
 648                 dup = strndup(strings, sep - strings);
 649                 sep++;
 650                 if (strncmp(strings, "parm", 4)) {
 651                         if (strlen(dup) < 7)
 652                                 printf("%s:\t\t%s\n",  dup, sep);
 653                         else
 654                                 printf("%s:\t%s\n",  dup, sep);
 655                 } else {
 656                         sep2 = strstr(sep, ":");
 657                         if (!sep2) {
 658                                 free(dup);
 659                                 break;
 660                         }
 661
 662                         pname = strndup(sep, sep2 - sep);
 663                         sep2++;
 664                         pdata = strdup(sep2);
 665
 666                         list_for_each_entry(p, &params, list)
 667                                 if (!strcmp(pname, p->name))
 668                                         break;
 669
 670                         if (list_entry_is_h(p, &params, list)) {
 671                                 p = alloca(sizeof(*p));
 672                                 p->name = pname;
 673                                 p->desc = p->type = NULL;
 674                                 list_add(&p->list, &params);
 675                         } else {
 676                                 free(pname);
 677                         }
 678
 679                         if (!strcmp(dup, "parmtype"))
 680                                 p->type = pdata;
 681                         else
 682                                 p->desc = pdata;
 683                 }
 684
 685                 free(dup);
 686 next_string:
 687                 strings = &sep[strlen(sep)];
 688         }
 689
 690         list_for_each_entry(p, &params, list) {
 691                 printf("parm:\t\t%s",  p->name);
 692                 if (p->desc)
 693                         printf(":%s", p->desc);
 694                 if (p->type)
 695                         printf(" (%s)", p->type);
 696                 printf("\n");
 697                 free(p->name);
 698                 free(p->desc);
 699                 free(p->type);
 700         }
 701
 702         rv = 0;
 703
 704 out:
 705         if (map != MAP_FAILED)
 706                 munmap(map, s.st_size);
 707
 708         return rv;
 709 }
 710
 711 static int deps_available(struct module *m, int verbose)
 712 {
 713         char *dep;
 714         int err = 0;
 715
 716         if (!m->depends || !strcmp(m->depends, "-") || !strcmp(m->depends, ""))
 717                 return 0;
 718
 719         dep = m->depends;
 720
 721         while (*dep) {
 722                 m = find_module(dep);
 723
 724                 if (verbose && !m)
 725                         ULOG_ERR("missing dependency %s\n", dep);
 726                 if (verbose && m && (m->state != LOADED))
 727                         ULOG_ERR("dependency not loaded %s\n", dep);
 728                 if (!m || (m->state != LOADED))
 729                         err++;
 730                 dep += strlen(dep) + 1;
 731         }
 732
 733         return err;
 734 }
 735
 736 static int insert_module(char *path, const char *options)
 737 {
 738         void *data = 0;
 739         struct stat s;
 740         int fd, ret = -1;
 741
 742         if (!path) {
 743                 ULOG_ERR("Path not specified\n");
 744                 return ret;
 745         }
 746
 747         if (stat(path, &s)) {
 748                 ULOG_ERR("missing module %s\n", path);
 749                 return ret;
 750         }
 751
 752         fd = open(path, O_RDONLY);
 753         if (fd < 0) {
 754                 ULOG_ERR("cannot open %s\n", path);
 755                 return ret;
 756         }
 757
 758         data = malloc(s.st_size);
 759         if (!data) {
 760                 ULOG_ERR("out of memory\n");
 761                 goto out;
 762         }
 763
 764         if (read(fd, data, s.st_size) == s.st_size) {
 765                 ret = syscall(__NR_init_module, data, (unsigned long) s.st_size, options);
 766                 if (errno == EEXIST)
 767                         ret = 0;
 768         }
 769         else
 770                 ULOG_ERR("failed to read full module %s\n", path);
 771
 772 out:
 773         close(fd);
 774         free(data);
 775
 776         return ret;
 777 }
 778
 779 static void load_moddeps(struct module *_m)
 780 {
 781         char *dep;
 782         struct module *m;
 783
 784         if (!strcmp(_m->depends, "-") || !strcmp(_m->depends, ""))
 785                 return;
 786
 787         dep = _m->depends;
 788
 789         while (*dep) {
 790                 m = find_module(dep);
 791
 792                 if (!m)
 793                         ULOG_ERR("failed to find dependency %s\n", dep);
 794                 if (m && (m->state != LOADED)) {
 795                         m->state = PROBE;
 796                         load_moddeps(m);
 797                 }
 798
 799                 dep = dep + strlen(dep) + 1;
 800         }
 801 }
 802
 803 static int load_modprobe(bool allow_load_retry)
 804 {
 805         int loaded, skipped, failed;
 806         struct module_node *mn;
 807         struct module *m;
 808         bool load_retry = false;
 809         static bool first_iteration = true;
 810
 811         avl_for_each_element(&modules, mn, avl) {
 812                 if (mn->is_alias)
 813                         continue;
 814                 m = mn->m;
 815                 if (m->state == PROBE)
 816                         load_moddeps(m);
 817         }
 818
 819         do {
 820                 loaded = 0;
 821                 skipped = 0;
 822                 failed = 0;
 823                 avl_for_each_element(&modules, mn, avl) {
 824                         if (mn->is_alias)
 825                                 continue;
 826                         m = mn->m;
 827                         if ((m->state == PROBE) && (!deps_available(m, 0)) && (!m->error || load_retry)) {
 828                                 if (!insert_module(get_module_path(m->name), (m->opts) ? (m->opts) : (""))) {
 829                                         m->state = LOADED;
 830                                         m->error = 0;
 831                                         loaded++;
 832                                         continue;
 833                                 }
 834
 835                                 m->error = 1;
 836                         }
 837
 838                         if (m->error)
 839                                 failed++;
 840                         else if (m->state == PROBE)
 841                                 skipped++;
 842                 }
 843
 844                 if (allow_load_retry) {
 845                         /* if we can't load anything else let's try to load failed modules */
 846                         load_retry = loaded ? (failed && !skipped) : (failed && !load_retry && !first_iteration);
 847                 }
 848
 849                 first_iteration = false;
 850         } while (loaded || load_retry);
 851
 852         return skipped + failed;
 853 }
 854
 855 static int print_insmod_usage(void)
 856 {
 857         ULOG_INFO("Usage:\n\tinsmod filename [args]\n");
 858
 859         return -1;
 860 }
 861
 862 static int print_modprobe_usage(void)
 863 {
 864         ULOG_INFO(
 865                 "Usage:\n"
 866                 "\tmodprobe [-q] [-v] filename\n"
 867                 "\tmodprobe -a [-q] [-v] filename [filename...]\n"
 868         );
 869
 870         return -1;
 871 }
 872
 873 static int print_usage(char *arg)
 874 {
 875         ULOG_INFO("Usage:\n\t%s module\n", arg);
 876
 877         return -1;
 878 }
 879
 880 static int main_insmod(int argc, char **argv)
 881 {
 882         char *name, *cur, *options;
 883         int i, ret, len;
 884
 885         if (argc < 2)
 886                 return print_insmod_usage();
 887
 888         name = get_module_name(argv[1]);
 889         if (!name) {
 890                 ULOG_ERR("cannot find module - %s\n", argv[1]);
 891                 return -1;
 892         }
 893
 894         if (scan_loaded_modules())
 895                 return -1;
 896
 897         if (find_module(name)) {
 898                 ULOG_ERR("module is already loaded - %s\n", name);
 899                 return -1;
 900
 901         }
 902
 903         free_modules();
 904
 905         for (len = 0, i = 2; i < argc; i++)
 906                 len += strlen(argv[i]) + 1;
 907
 908         options = malloc(len);
 909         if (!options) {
 910                 ULOG_ERR("out of memory\n");
 911                 ret = -1;
 912                 goto err;
 913         }
 914
 915         options[0] = 0;
 916         cur = options;
 917         for (i = 2; i < argc; i++) {
 918                 if (options[0]) {
 919                         *cur = ' ';
 920                         cur++;
 921                 }
 922                 cur += sprintf(cur, "%s", argv[i]);
 923         }
 924
 925         if (init_module_folders()) {
 926                 fprintf(stderr, "Failed to find the folder holding the modules\n");
 927                 ret = -1;
 928                 goto err;
 929         }
 930
 931         if (get_module_path(argv[1])) {
 932                 name = argv[1];
 933         } else if (!get_module_path(name)) {
 934                 fprintf(stderr, "Failed to find %s. Maybe it is a built in module ?\n", name);
 935                 ret = -1;
 936                 goto err;
 937         }
 938
 939         ret = insert_module(get_module_path(name), options);
 940         if (ret)
 941                 ULOG_ERR("failed to insert %s\n", get_module_path(name));
 942
 943 err:
 944         free(options);
 945         return ret;
 946 }
 947
 948 static int main_rmmod(int argc, char **argv)
 949 {
 950         struct module *m;
 951         char *name;
 952         int ret;
 953
 954         if (argc != 2)
 955                 return print_usage("rmmod");
 956
 957         if (scan_loaded_modules())
 958                 return -1;
 959
 960         if (scan_builtin_modules())
 961                 return -1;
 962
 963         name = get_module_name(argv[1]);
 964         m = find_module(name);
 965         if (!m) {
 966                 ULOG_ERR("module is not loaded\n");
 967                 return -1;
 968         }
 969         if (m->state == BUILTIN) {
 970                 ULOG_ERR("module is builtin\n");
 971                 return -1;
 972         }
 973         ret = syscall(__NR_delete_module, m->name, 0);
 974
 975         if (ret)
 976                 ULOG_ERR("unloading the module failed\n");
 977
 978         free_modules();
 979
 980         return ret;
 981 }
 982
 983 static int main_lsmod(int argc, char **argv)
 984 {
 985         struct module_node *mn;
 986         struct module *m;
 987         char *dep;
 988
 989         if (scan_loaded_modules())
 990                 return -1;
 991
 992         avl_for_each_element(&modules, mn, avl) {
 993                 if (mn->is_alias)
 994                         continue;
 995                 m = mn->m;
 996                 if (m->state == LOADED) {
 997                         printf("%-20s%8d%3d ",
 998                                 m->name, m->size, m->usage);
 999                         if (m->depends && strcmp(m->depends, "-") && strcmp(m->depends, "")) {
1000                                 dep = m->depends;
1001                                 while (*dep) {
1002                                         printf("%s", dep);
1003                                         dep = dep + strlen(dep) + 1;
1004                                         if (*dep)
1005                                                 printf(",");
1006                                 }
1007                         }
1008                         printf("\n");
1009                 }
1010         }
1011
1012         free_modules();
1013
1014         return 0;
1015 }
1016
1017 static int main_modinfo(int argc, char **argv)
1018 {
1019         struct module *m;
1020         char *name;
1021
1022         if (argc != 2)
1023                 return print_usage("modinfo");
1024
1025         if (scan_module_folders())
1026                 return -1;
1027
1028         if (scan_builtin_modules())
1029                 return -1;
1030
1031         name = get_module_name(argv[1]);
1032         m = find_module(name);
1033         if (!m) {
1034                 ULOG_ERR("cannot find module - %s\n", argv[1]);
1035                 return -1;
1036         }
1037
1038         print_modinfo(m);
1039
1040         return 0;
1041 }
1042
1043 static int main_modprobe(int argc, char **argv)
1044 {
1045         struct module_node *mn;
1046         struct module *m;
1047         int exit_code = 0;
1048         int load_fail;
1049         int log_level = LOG_WARNING;
1050         int opt;
1051         bool quiet = false;
1052         bool use_all = false;
1053
1054         while ((opt = getopt(argc, argv, "aqv")) != -1 ) {
1055                 switch (opt) {
1056                         case 'a':
1057                                 use_all = true;
1058                                 break;
1059                         case 'q': /* shhhh! */
1060                                 quiet = true;
1061                                 break;
1062                         case 'v':
1063                                 log_level = LOG_DEBUG;
1064                                 break;
1065                         default: /* '?' */
1066                                 return print_modprobe_usage();
1067                                 break;
1068                         }
1069         }
1070
1071         if (optind >= argc)
1072                 return print_modprobe_usage(); /* expected module after options */
1073
1074         /* after print_modprobe_usage() so it won't be filtered out */
1075         ulog_threshold(log_level);
1076
1077         if (scan_module_folders())
1078                 return -1;
1079
1080         if (scan_loaded_modules())
1081                 return -1;
1082
1083         if (scan_builtin_modules())
1084                 return -1;
1085
1086         do {
1087                 char *name;
1088
1089                 name = get_module_name(argv[optind]);
1090                 m = find_module(name);
1091
1092                 if (m && m->state == BLACKLISTED) {
1093                         if (!quiet)
1094                                 ULOG_INFO("%s is blacklisted\n", name);
1095                 } else if (m && m->state == LOADED) {
1096                         if (!quiet)
1097                                 ULOG_INFO("%s is already loaded\n", name);
1098                 } else if (m && m->state == BUILTIN) {
1099                         if (!quiet)
1100                                 ULOG_INFO("%s is builtin\n", name);
1101                 } else if (!m) {
1102                         if (!quiet)
1103                                 ULOG_ERR("failed to find a module named %s\n", name);
1104                         exit_code = -1;
1105                 } else {
1106                         m->state = PROBE;
1107                 }
1108
1109                 optind++;
1110         } while (use_all && optind < argc);
1111
1112         load_fail = load_modprobe(true);
1113         if (load_fail) {
1114                 ULOG_ERR("%d module%s could not be probed\n",
1115                          load_fail, (load_fail == 1) ? ("") : ("s"));
1116
1117                 avl_for_each_element(&modules, mn, avl) {
1118                         if (mn->is_alias)
1119                                 continue;
1120                         m = mn->m;
1121                         if ((m->state == PROBE) || m->error)
1122                                 ULOG_ERR("- %s\n", m->name);
1123                 }
1124
1125                 exit_code = -1;
1126         }
1127
1128         free_modules();
1129
1130         return exit_code;
1131 }
1132
1133 static int main_loader(int argc, char **argv)
1134 {
1135         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
1136         char *dir = "/etc/modules.d/";
1137         struct module_node *mn;
1138         struct module *m;
1139         glob_t gl;
1140         char *path;
1141         int ret = 0, fail, j;
1142
1143         if (argc > 1)
1144                 dir = argv[1];
1145
1146         path = malloc(strlen(dir) + 2);
1147         if (!path) {
1148                 ULOG_ERR("out of memory\n");
1149                 return -1;
1150         }
1151
1152         strcpy(path, dir);
1153         strcat(path, "*");
1154
1155         if (scan_module_folders()) {
1156                 ret = -1;
1157                 goto free_path;
1158         }
1159
1160         if (scan_loaded_modules()) {
1161                 ret = -1;
1162                 goto free_path;
1163         }
1164
1165         ULOG_INFO("loading kernel modules from %s\n", path);
1166
1167         if (glob(path, gl_flags, NULL, &gl) < 0)
1168                 goto out;
1169
1170         for (j = 0; j < gl.gl_pathc; j++) {
1171                 FILE *fp = fopen(gl.gl_pathv[j], "r");
1172                 size_t mod_len = 0;
1173                 char *mod = NULL;
1174
1175                 if (!fp) {
1176                         ULOG_ERR("failed to open %s\n", gl.gl_pathv[j]);
1177                         continue;
1178                 }
1179
1180                 while (getline(&mod, &mod_len, fp) > 0) {
1181                         char *nl = strchr(mod, '\n');
1182                         struct module *m;
1183                         char *opts;
1184
1185                         if (nl)
1186                                 *nl = '\0';
1187
1188                         opts = strchr(mod, ' ');
1189                         if (opts)
1190                                 *opts++ = '\0';
1191
1192                         m = find_module(get_module_name(mod));
1193                         if (!m || m->state == LOADED || m->state == BLACKLISTED)
1194                                 continue;
1195
1196                         if (opts) {
1197                                 if (m->opts) {
1198                                         char *prev = m->opts;
1199
1200                                         fail = asprintf(&m->opts, "%s %s", prev, opts);
1201                                         free(prev);
1202                                         if (fail < 0) {
1203                                                 ULOG_ERR("out of memory for opts %s\n", opts);
1204                                                 free(mod);
1205                                                 fclose(fp);
1206                                                 ret = -1;
1207                                                 goto out;
1208                                         }
1209                                 } else {
1210                                         m->opts = strdup(opts);
1211                                 }
1212                         }
1213                         m->state = PROBE;
1214                         if (basename(gl.gl_pathv[j])[0] - '0' <= 9)
1215                                 load_modprobe(false);
1216
1217                 }
1218                 free(mod);
1219                 fclose(fp);
1220         }
1221
1222         fail = load_modprobe(true);
1223
1224         if (fail) {
1225                 ULOG_ERR("%d module%s could not be probed\n",
1226                          fail, (fail == 1) ? ("") : ("s"));
1227
1228                 avl_for_each_element(&modules, mn, avl) {
1229                         if (mn->is_alias)
1230                                 continue;
1231                         m = mn->m;
1232                         if ((m->state == PROBE) || (m->error))
1233                                 ULOG_ERR("- %s - %d\n", m->name, deps_available(m, 1));
1234                 }
1235         } else {
1236                 ULOG_INFO("done loading kernel modules from %s\n", path);
1237         }
1238
1239 out:
1240         globfree(&gl);
1241 free_path:
1242         free(path);
1243
1244         return ret;
1245 }
1246
1247 static inline char weight(char c)
1248 {
1249         return c == '_' ? '-' : c;
1250 }
1251
1252 static int avl_modcmp(const void *k1, const void *k2, void *ptr)
1253 {
1254         const char *s1 = k1;
1255         const char *s2 = k2;
1256
1257         while (*s1 && (weight(*s1) == weight(*s2)))
1258         {
1259                 s1++;
1260                 s2++;
1261         }
1262
1263         return (unsigned char)weight(*s1) - (unsigned char)weight(*s2);
1264 }
1265
1266 static void
1267 load_options(void)
1268 {
1269         static char buf[512];
1270         char *s;
1271         FILE *f;
1272
1273         f = fopen("/etc/modules.conf", "r");
1274         if (!f)
1275                 return;
1276
1277         while ((s = fgets(buf, sizeof(buf), f)) != NULL) {
1278                 char *c, *cmd, *mod;
1279
1280                 while (isspace(*s))
1281                         s++;
1282
1283                 c = strchr(s, '#');
1284                 if (c)
1285                         *c = 0;
1286
1287                 while (isspace(*s))
1288                         s++;
1289
1290                 c = s + strlen(s);
1291                 while (c > s && isspace(c[-1])) {
1292                         c[-1] = 0;
1293                         c--;
1294                 }
1295
1296                 cmd = strsep(&s, " \t");
1297                 if (!cmd || !*cmd)
1298                         continue;
1299
1300                 while (isspace(*s))
1301                         s++;
1302
1303                 mod = strsep(&s, " \t");
1304                 if (!mod || !*mod)
1305                         continue;
1306
1307                 if (!strcmp(cmd, "blacklist")) {
1308                         kvlist_set(&options, mod, "\x01");
1309                         continue;
1310                 }
1311
1312                 if (!strcmp(cmd, "options")) {
1313                         char *prev = kvlist_get(&options, mod);
1314                         char *val = NULL;
1315
1316                         while (isspace(*s))
1317                                 s++;
1318
1319                         if (!*s)
1320                                 continue;
1321
1322                         if (prev && prev[0] == '\x01')
1323                                 continue;
1324
1325                         if (!prev) {
1326                                 kvlist_set(&options, mod, s);
1327                                 continue;
1328                         }
1329
1330                         if (asprintf(&val, "%s %s", prev, s) < 0)
1331                                 continue;
1332
1333                         kvlist_set(&options, mod, val);
1334                         free(val);
1335                         continue;
1336                 }
1337         }
1338
1339         fclose(f);
1340 }
1341
1342 int main(int argc, char **argv)
1343 {
1344         char *exec = basename(*argv);
1345
1346         avl_init(&modules, avl_modcmp, false, NULL);
1347         if (!strcmp(exec, "insmod"))
1348                 return main_insmod(argc, argv);
1349
1350         if (!strcmp(exec, "rmmod"))
1351                 return main_rmmod(argc, argv);
1352
1353         if (!strcmp(exec, "lsmod"))
1354                 return main_lsmod(argc, argv);
1355
1356         if (!strcmp(exec, "modinfo"))
1357                 return main_modinfo(argc, argv);
1358
1359         load_options();
1360
1361         if (!strcmp(exec, "modprobe"))
1362                 return main_modprobe(argc, argv);
1363
1364         ulog_open(ULOG_KMSG, LOG_USER, "kmodloader");
1365         return main_loader(argc, argv);
1366 }