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 void free_module_folders(void)
 136 {
 137         int n = 0;
 138
 139         if (!module_folders)
 140                 return;
 141         while (module_folders[n])
 142                 free(module_folders[n++]);
 143         free(module_folders);
 144 }
 145
 146 static struct module *find_module(const char *name)
 147 {
 148         struct module_node *mn;
 149         mn = avl_find_element(&modules, name, mn, avl);
 150         if (mn)
 151                 return mn->m;
 152         else
 153                 return NULL;
 154 }
 155
 156 static void free_modules(void)
 157 {
 158         struct module_node *mn, *tmp;
 159
 160         avl_remove_all_elements(&modules, mn, avl, tmp) {
 161                 struct module *m = mn->m;
 162
 163                 m->refcnt -= 1;
 164                 if (m->refcnt == 0)
 165                         free_module(m);
 166                 free(mn);
 167         }
 168 }
 169
 170 static char* get_module_path(char *name)
 171 {
 172         char **p;
 173         static char path[256];
 174         struct stat s;
 175
 176         if (!stat(name, &s) && S_ISREG(s.st_mode))
 177                 return name;
 178
 179         for (p = module_folders; *p; p++) {
 180                 snprintf(path, sizeof(path), "%s%s.ko", *p, name);
 181                 if (!stat(path, &s) && S_ISREG(s.st_mode))
 182                         return path;
 183         }
 184
 185         return NULL;
 186 }
 187
 188 static char* get_module_name(char *path)
 189 {
 190         static char name[MODULE_NAME_LEN];
 191         char *t;
 192
 193         strncpy(name, basename(path), sizeof(name) - 1);
 194
 195         t = strstr(name, ".ko");
 196         if (t)
 197                 *t = '\0';
 198
 199         return name;
 200 }
 201
 202 static int elf64_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
 203 {
 204         const char *secnames;
 205         Elf64_Ehdr *e;
 206         Elf64_Shdr *sh;
 207         int i;
 208
 209         e = (Elf64_Ehdr *) map;
 210         sh = (Elf64_Shdr *) (map + e->e_shoff);
 211
 212         secnames = map + sh[e->e_shstrndx].sh_offset;
 213         for (i = 0; i < e->e_shnum; i++) {
 214                 if (!strcmp(section, secnames + sh[i].sh_name)) {
 215                         *size = sh[i].sh_size;
 216                         *offset = sh[i].sh_offset;
 217                         return 0;
 218                 }
 219         }
 220
 221         return -1;
 222 }
 223
 224 static int elf32_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
 225 {
 226         const char *secnames;
 227         Elf32_Ehdr *e;
 228         Elf32_Shdr *sh;
 229         int i;
 230
 231         e = (Elf32_Ehdr *) map;
 232         sh = (Elf32_Shdr *) (map + e->e_shoff);
 233
 234         secnames = map + sh[e->e_shstrndx].sh_offset;
 235         for (i = 0; i < e->e_shnum; i++) {
 236                 if (!strcmp(section, secnames + sh[i].sh_name)) {
 237                         *size = sh[i].sh_size;
 238                         *offset = sh[i].sh_offset;
 239                         return 0;
 240                 }
 241         }
 242
 243         return -1;
 244 }
 245
 246 static int elf_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
 247 {
 248         int clazz = map[EI_CLASS];
 249         int endian = map[EI_DATA];
 250
 251 #if __BYTE_ORDER == __LITTLE_ENDIAN
 252         if (endian != ELFDATA2LSB)
 253 #elif __BYTE_ORDER == __BIG_ENDIAN
 254         if (endian != ELFDATA2MSB)
 255 #else
 256 #error "unsupported endian"
 257 #endif
 258         {
 259                 ULOG_ERR("invalid endianess: %d\n", endian);
 260                 return -1;
 261         }
 262
 263         if (clazz == ELFCLASS32)
 264                 return elf32_find_section(map, section, offset, size);
 265         else if (clazz == ELFCLASS64)
 266                 return elf64_find_section(map, section, offset, size);
 267
 268         ULOG_ERR("unknown elf format %d\n", clazz);
 269
 270         return -1;
 271 }
 272
 273 static struct module_node *
 274 alloc_module_node(const char *name, struct module *m, bool is_alias)
 275 {
 276         struct module_node *mn;
 277         char *_name;
 278
 279         mn = calloc_a(sizeof(*mn),
 280                 &_name, strlen(name) + 1);
 281         if (mn) {
 282                 mn->avl.key = strcpy(_name, name);
 283                 mn->m = m;
 284                 mn->is_alias = is_alias;
 285                 avl_insert(&modules, &mn->avl);
 286                 m->refcnt += 1;
 287         }
 288         return mn;
 289 }
 290
 291 static struct module *
 292 alloc_module(const char *name, const char * const *aliases, int naliases, const char *depends, int size)
 293 {
 294         struct module *m;
 295         char *_name, *_dep;
 296         int i;
 297
 298         m = calloc_a(sizeof(*m),
 299                 &_name, strlen(name) + 1,
 300                 &_dep, depends ? strlen(depends) + 2 : 0);
 301         if (!m)
 302                 return NULL;
 303
 304         m->name = strcpy(_name, name);
 305         m->opts = 0;
 306
 307         if (depends) {
 308                 m->depends = strcpy(_dep, depends);
 309                 while (*_dep) {
 310                         if (*_dep == ',')
 311                                 *_dep = '\0';
 312                         _dep++;
 313                 }
 314         }
 315         m->size = size;
 316
 317         m->refcnt = 0;
 318         alloc_module_node(m->name, m, false);
 319         for (i = 0; i < naliases; i++)
 320                 alloc_module_node(aliases[i], m, true);
 321
 322         return m;
 323 }
 324
 325 static void free_module(struct module *m)
 326 {
 327         if (m->opts)
 328                 free(m->opts);
 329         free(m);
 330 }
 331
 332 static int scan_loaded_modules(void)
 333 {
 334         size_t buf_len = 0;
 335         char *buf = NULL;
 336         int rv = -1;
 337         FILE *fp;
 338
 339         fp = fopen("/proc/modules", "r");
 340         if (!fp) {
 341                 ULOG_ERR("failed to open /proc/modules\n");
 342                 return -1;
 343         }
 344
 345         while (getline(&buf, &buf_len, fp) > 0) {
 346                 struct module m;
 347                 struct module *n;
 348
 349                 m.name = strtok(buf, " ");
 350                 m.size = atoi(strtok(NULL, " "));
 351                 m.usage = atoi(strtok(NULL, " "));
 352                 m.depends = strtok(NULL, " ");
 353
 354                 if (!m.name || !m.depends)
 355                         continue;
 356
 357                 n = find_module(m.name);
 358                 if (!n) {
 359                         /* possibly a module outside /lib/modules/<ver>/ */
 360                         n = alloc_module(m.name, NULL, 0, m.depends, m.size);
 361                 }
 362                 if (!n) {
 363                         ULOG_ERR("Failed to allocate memory for module\n");
 364                         goto out;
 365                 }
 366
 367                 n->usage = m.usage;
 368                 n->state = LOADED;
 369         }
 370         rv = 0;
 371 out:
 372         free(buf);
 373         fclose(fp);
 374
 375         return rv;
 376 }
 377
 378 static char *mmap_modinfo(const char *module, const char *name, struct stat *s, unsigned int *offset, unsigned int *size)
 379 {
 380         const bool is_builtin = (module == NULL);
 381         const char *mpath = NULL;
 382         char *map = MAP_FAILED;
 383         char path[350], **f;
 384         int fd = -1;
 385
 386         if (is_builtin)
 387                 for (f = module_folders; *f; f++) {
 388                         snprintf(path, sizeof(path), "%s%s", *f, MOD_BUILTIN_MODINFO);
 389                         if (!stat(path, s) && S_ISREG(s->st_mode)) {
 390                                 mpath = path;
 391                                 break;
 392                         }
 393                 }
 394         else
 395                 mpath = module;
 396
 397         if (!mpath) {
 398                 ULOG_ERR("cannot find modinfo path of module - %s\n", name);
 399                 goto out;
 400         }
 401
 402         fd = open(mpath, O_RDONLY);
 403         if (fd < 0) {
 404                 ULOG_ERR("failed to open %s\n", mpath);
 405                 goto out;
 406         }
 407
 408         if (fstat(fd, s) == -1) {
 409                 ULOG_ERR("failed to stat %s\n", mpath);
 410                 goto out;
 411         }
 412
 413         map = mmap(NULL, s->st_size, PROT_READ, MAP_PRIVATE, fd, 0);
 414         if (map == MAP_FAILED) {
 415                 ULOG_ERR("failed to mmap %s\n", mpath);
 416                 goto out;
 417         }
 418
 419         if (is_builtin) {
 420                 *offset = 0;
 421                 *size = s->st_size;
 422         } else if (elf_find_section(map, ".modinfo", offset, size)) {
 423                 ULOG_ERR("failed to load the .modinfo section from %s\n", mpath);
 424                 munmap(map, s->st_size);
 425                 map = MAP_FAILED;
 426         }
 427
 428 out:
 429         if (fd >= 0)
 430                 close(fd);
 431         return map;
 432 }
 433
 434 static struct module* get_module_info(const char *module, const char *name)
 435 {
 436         const bool is_builtin = (module == NULL);
 437         unsigned int offset, size;
 438         char *map, *strings, *dep = NULL;
 439         const char **aliases = NULL;
 440         const char **aliasesr;
 441         int naliases = 0;
 442         struct module *m = NULL;
 443         struct stat s;
 444
 445         map = mmap_modinfo(module, name, &s, &offset, &size);
 446         if (map == MAP_FAILED)
 447                 goto out;
 448
 449         strings = map + offset;
 450         while (true) {
 451                 char *end = map + offset + size;
 452                 char *sep;
 453                 int len;
 454
 455                 while ((strings < end) && !strings[0])
 456                         strings++;
 457                 if (strings >= end)
 458                         break;
 459                 if (is_builtin) {
 460                         sep = strstr(strings, ".");
 461                         if (!sep)
 462                                 break;
 463                         if (strlen(name) == (sep - strings) &&
 464                             !strncmp(strings, name, sep - strings))
 465                                 strings = sep + 1;
 466                         else
 467                                 goto next_string;
 468                 }
 469                 sep = strstr(strings, "=");
 470                 if (!sep)
 471                         break;
 472                 len = sep - strings;
 473                 sep++;
 474                 if (!strncmp(strings, "depends=", len + 1))
 475                         dep = sep;
 476                 else if (!strncmp(strings, "alias=", len + 1)) {
 477                         aliasesr = realloc(aliases, sizeof(sep) * (naliases + 1));
 478                         if (!aliasesr) {
 479                                 ULOG_ERR("out of memory\n");
 480                                 goto out;
 481                         }
 482
 483                         aliases = aliasesr;
 484                         aliases[naliases++] = sep;
 485                 }
 486 next_string:
 487                 strings = &sep[strlen(sep)];
 488         }
 489
 490         m = alloc_module(name, aliases, naliases, dep, is_builtin ? 0 : s.st_size);
 491
 492         if (m)
 493                 m->state = is_builtin ? BUILTIN : SCANNED;
 494
 495 out:
 496         if (map != MAP_FAILED)
 497                 munmap(map, s.st_size);
 498
 499         free(aliases);
 500
 501         return m;
 502 }
 503
 504 static int scan_builtin_modules(void)
 505 {
 506         char **p, path[350];
 507         size_t buf_len = 0;
 508         char *buf = NULL;
 509         struct stat st;
 510         FILE *fp = NULL;
 511         int rv = -1;
 512
 513         if (!module_folders && init_module_folders())
 514                 return -1;
 515         for (p = module_folders; *p; p++) {
 516                 snprintf(path, sizeof(path), "%s%s", *p, MOD_BUILTIN);
 517                 fp = fopen(path, "r");
 518                 if (!fp)
 519                         continue;
 520
 521                 if (!fstat(fileno(fp), &st) && S_ISREG(st.st_mode))
 522                         break;
 523
 524                 /* Not regular file, close it and check next */
 525                 fclose(fp);
 526                 fp = NULL;
 527         }
 528         if (!fp)
 529                 return 0;       /* OK if modules.builtin unavailable */
 530
 531         while (getline(&buf, &buf_len, fp) > 0) {
 532                 struct module *m;
 533                 char *name;
 534
 535                 name = get_module_name(buf);
 536                 if (!name)
 537                         continue;
 538                 m = find_module(name);
 539                 if (m && !strcmp(m->name, name)) {
 540                         ULOG_WARN("found duplicate builtin module %s\n", name);
 541                         continue;
 542                 }
 543                 m = get_module_info(NULL, name);
 544                 if (!m) {
 545                         ULOG_ERR("failed to find info for builtin module %s\n", name);
 546                         goto err;
 547                 }
 548         }
 549
 550         rv = 0;
 551 err:
 552         free(buf);
 553         fclose(fp);
 554
 555         return rv;
 556 }
 557
 558 static int scan_module_folder(const char *dir)
 559 {
 560         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 561         char *path;
 562         glob_t gl;
 563         int j, rv = 0;
 564
 565         path = alloca(strlen(dir) + sizeof("*.ko") + 1);
 566         sprintf(path, "%s*.ko", dir);
 567
 568         if (glob(path, gl_flags, NULL, &gl) < 0)
 569                 return -1;
 570
 571         for (j = 0; j < gl.gl_pathc; j++) {
 572                 char *name = get_module_name(gl.gl_pathv[j]);
 573                 struct module *m;
 574                 char *opts;
 575
 576                 if (!name)
 577                         continue;
 578
 579                 m = find_module(name);
 580                 if (m)
 581                         continue;
 582
 583                 m = get_module_info(gl.gl_pathv[j], name);
 584                 if (!m) {
 585                         rv |= -1;
 586                         continue;
 587                 }
 588
 589                 opts = kvlist_get(&options, name);
 590                 if (!opts)
 591                         continue;
 592
 593                 if (*opts == '\x01')
 594                         m->state = BLACKLISTED;
 595                 else
 596                         m->opts = strdup(opts);
 597         }
 598
 599         globfree(&gl);
 600
 601         return rv;
 602 }
 603
 604 static int scan_module_folders(void)
 605 {
 606         int rv = 0;
 607         char **p;
 608
 609         if (init_module_folders())
 610                 return -1;
 611
 612         for (p = module_folders; *p; p++)
 613                 rv |= scan_module_folder(*p);
 614
 615         return rv;
 616 }
 617
 618 static int print_modinfo(const struct module *m)
 619 {
 620         const bool is_builtin = (m->state == BUILTIN);
 621         unsigned int offset, size;
 622         struct param *p;
 623         struct stat s;
 624         char *map, *strings, *mpath;
 625         int rv = -1;
 626
 627         LIST_HEAD(params);
 628
 629         mpath = get_module_path(m->name);
 630         map = mmap_modinfo(mpath, m->name, &s, &offset, &size);
 631         if (map == MAP_FAILED)
 632                 goto out;
 633
 634         strings = map + offset;
 635         if (is_builtin)
 636                 printf("name:\t\t%s\n", m->name);
 637         printf("filename:\t%s\n", is_builtin ? "(builtin)" : mpath);
 638         while (true) {
 639                 char *end = map + offset + size;
 640                 char *pname, *pdata;
 641                 char *dup = NULL;
 642                 char *sep, *sep2;
 643
 644                 while ((strings < end) && !strings[0])
 645                         strings++;
 646                 if (strings >= end)
 647                         break;
 648                 if (is_builtin) {
 649                         sep = strstr(strings, ".");
 650                         if (!sep)
 651                                 break;
 652                         if (strlen(m->name) == (sep - strings) &&
 653                             !strncmp(strings, m->name, sep - strings))
 654                                 strings = sep + 1;
 655                         else
 656                                 goto next_string;
 657                 }
 658                 sep = strstr(strings, "=");
 659                 if (!sep)
 660                         break;
 661                 dup = strndup(strings, sep - strings);
 662                 sep++;
 663                 if (strncmp(strings, "parm", 4)) {
 664                         if (strlen(dup) < 7)
 665                                 printf("%s:\t\t%s\n",  dup, sep);
 666                         else
 667                                 printf("%s:\t%s\n",  dup, sep);
 668                 } else {
 669                         sep2 = strstr(sep, ":");
 670                         if (!sep2) {
 671                                 free(dup);
 672                                 break;
 673                         }
 674
 675                         pname = strndup(sep, sep2 - sep);
 676                         sep2++;
 677                         pdata = strdup(sep2);
 678
 679                         list_for_each_entry(p, &params, list)
 680                                 if (!strcmp(pname, p->name))
 681                                         break;
 682
 683                         if (list_entry_is_h(p, &params, list)) {
 684                                 p = alloca(sizeof(*p));
 685                                 p->name = pname;
 686                                 p->desc = p->type = NULL;
 687                                 list_add(&p->list, &params);
 688                         } else {
 689                                 free(pname);
 690                         }
 691
 692                         if (!strcmp(dup, "parmtype"))
 693                                 p->type = pdata;
 694                         else
 695                                 p->desc = pdata;
 696                 }
 697
 698                 free(dup);
 699 next_string:
 700                 strings = &sep[strlen(sep)];
 701         }
 702
 703         list_for_each_entry(p, &params, list) {
 704                 printf("parm:\t\t%s",  p->name);
 705                 if (p->desc)
 706                         printf(":%s", p->desc);
 707                 if (p->type)
 708                         printf(" (%s)", p->type);
 709                 printf("\n");
 710                 free(p->name);
 711                 free(p->desc);
 712                 free(p->type);
 713         }
 714
 715         rv = 0;
 716
 717 out:
 718         if (map != MAP_FAILED)
 719                 munmap(map, s.st_size);
 720
 721         return rv;
 722 }
 723
 724 static int deps_available(struct module *m, int verbose)
 725 {
 726         char *dep;
 727         int err = 0;
 728
 729         if (!m->depends || !strcmp(m->depends, "-") || !strcmp(m->depends, ""))
 730                 return 0;
 731
 732         dep = m->depends;
 733
 734         while (*dep) {
 735                 m = find_module(dep);
 736
 737                 if (verbose && !m)
 738                         ULOG_ERR("missing dependency %s\n", dep);
 739                 if (verbose && m && (m->state != LOADED))
 740                         ULOG_ERR("dependency not loaded %s\n", dep);
 741                 if (!m || (m->state != LOADED))
 742                         err++;
 743                 dep += strlen(dep) + 1;
 744         }
 745
 746         return err;
 747 }
 748
 749 static int insert_module(char *path, const char *options)
 750 {
 751         void *data = 0;
 752         struct stat s;
 753         int fd, ret = -1;
 754
 755         if (!path) {
 756                 ULOG_ERR("Path not specified\n");
 757                 return ret;
 758         }
 759
 760         if (stat(path, &s)) {
 761                 ULOG_ERR("missing module %s\n", path);
 762                 return ret;
 763         }
 764
 765         fd = open(path, O_RDONLY);
 766         if (fd < 0) {
 767                 ULOG_ERR("cannot open %s\n", path);
 768                 return ret;
 769         }
 770
 771         data = malloc(s.st_size);
 772         if (!data) {
 773                 ULOG_ERR("out of memory\n");
 774                 goto out;
 775         }
 776
 777         if (read(fd, data, s.st_size) == s.st_size) {
 778                 ret = syscall(__NR_init_module, data, (unsigned long) s.st_size, options);
 779                 if (errno == EEXIST)
 780                         ret = 0;
 781         }
 782         else
 783                 ULOG_ERR("failed to read full module %s\n", path);
 784
 785 out:
 786         close(fd);
 787         free(data);
 788
 789         return ret;
 790 }
 791
 792 static void load_moddeps(struct module *_m)
 793 {
 794         char *dep;
 795         struct module *m;
 796
 797         if (!strcmp(_m->depends, "-") || !strcmp(_m->depends, ""))
 798                 return;
 799
 800         dep = _m->depends;
 801
 802         while (*dep) {
 803                 m = find_module(dep);
 804
 805                 if (!m)
 806                         ULOG_ERR("failed to find dependency %s\n", dep);
 807                 if (m && (m->state != LOADED)) {
 808                         m->state = PROBE;
 809                         load_moddeps(m);
 810                 }
 811
 812                 dep = dep + strlen(dep) + 1;
 813         }
 814 }
 815
 816 static int load_modprobe(bool allow_load_retry)
 817 {
 818         int loaded, skipped, failed;
 819         struct module_node *mn;
 820         struct module *m;
 821         bool load_retry = false;
 822         static bool first_iteration = true;
 823
 824         avl_for_each_element(&modules, mn, avl) {
 825                 if (mn->is_alias)
 826                         continue;
 827                 m = mn->m;
 828                 if (m->state == PROBE)
 829                         load_moddeps(m);
 830         }
 831
 832         do {
 833                 loaded = 0;
 834                 skipped = 0;
 835                 failed = 0;
 836                 avl_for_each_element(&modules, mn, avl) {
 837                         if (mn->is_alias)
 838                                 continue;
 839                         m = mn->m;
 840                         if ((m->state == PROBE) && (!deps_available(m, 0)) && (!m->error || load_retry)) {
 841                                 if (!insert_module(get_module_path(m->name), (m->opts) ? (m->opts) : (""))) {
 842                                         m->state = LOADED;
 843                                         m->error = 0;
 844                                         loaded++;
 845                                         continue;
 846                                 }
 847
 848                                 m->error = 1;
 849                         }
 850
 851                         if (m->error)
 852                                 failed++;
 853                         else if (m->state == PROBE)
 854                                 skipped++;
 855                 }
 856
 857                 if (allow_load_retry) {
 858                         /* if we can't load anything else let's try to load failed modules */
 859                         load_retry = loaded ? (failed && !skipped) : (failed && !load_retry && !first_iteration);
 860                 }
 861
 862                 first_iteration = false;
 863         } while (loaded || load_retry);
 864
 865         return skipped + failed;
 866 }
 867
 868 static int print_insmod_usage(void)
 869 {
 870         ULOG_INFO("Usage:\n\tinsmod filename [args]\n");
 871
 872         return -1;
 873 }
 874
 875 static int print_modprobe_usage(void)
 876 {
 877         ULOG_INFO(
 878                 "Usage:\n"
 879                 "\tmodprobe [-q] [-v] filename\n"
 880                 "\tmodprobe -a [-q] [-v] filename [filename...]\n"
 881         );
 882
 883         return -1;
 884 }
 885
 886 static int print_usage(char *arg)
 887 {
 888         ULOG_INFO("Usage:\n\t%s module\n", arg);
 889
 890         return -1;
 891 }
 892
 893 static int main_insmod(int argc, char **argv)
 894 {
 895         char *name, *path, *cur, *opts = NULL;
 896         int i, ret = -1, len;
 897
 898         if (argc < 2)
 899                 return print_insmod_usage();
 900
 901         name = get_module_name(argv[1]);
 902         if (!name) {
 903                 ULOG_ERR("cannot find module - %s\n", argv[1]);
 904                 return -1;
 905         }
 906
 907         if (scan_loaded_modules())
 908                 return -1;
 909
 910         if (find_module(name)) {
 911                 ULOG_ERR("module is already loaded - %s\n", name);
 912                 goto err;
 913
 914         }
 915
 916         for (len = 1, i = 2; i < argc; i++)
 917                 len += strlen(argv[i]) + 1;
 918
 919         opts = malloc(len);
 920         if (!opts) {
 921                 ULOG_ERR("out of memory\n");
 922                 goto err;
 923         }
 924
 925         opts[0] = 0;
 926         cur = opts;
 927         for (i = 2; i < argc; i++) {
 928                 if (opts[0]) {
 929                         *cur = ' ';
 930                         cur++;
 931                 }
 932                 cur += sprintf(cur, "%s", argv[i]);
 933         }
 934
 935         if (init_module_folders()) {
 936                 fprintf(stderr, "Failed to find the folder holding the modules\n");
 937                 goto err;
 938         }
 939
 940         if (!(path = get_module_path(argv[1])) ||
 941              (path = get_module_path(name))) {
 942                 fprintf(stderr, "Failed to find %s. Maybe it is a built in module ?\n", name);
 943                 goto err;
 944         }
 945
 946         ret = insert_module(path, opts);
 947         if (ret)
 948                 ULOG_ERR("failed to insert %s\n", get_module_path(name));
 949
 950 err:
 951         free(opts);
 952         free_modules();
 953         free_module_folders();
 954
 955         return ret;
 956 }
 957
 958 static int main_rmmod(int argc, char **argv)
 959 {
 960         struct module *m;
 961         char *name;
 962         int ret = -1;
 963
 964         if (argc != 2)
 965                 return print_usage("rmmod");
 966
 967         if (scan_loaded_modules())
 968                 return -1;
 969
 970         if (scan_builtin_modules())
 971                 return -1;
 972
 973         name = get_module_name(argv[1]);
 974         m = find_module(name);
 975         if (!m) {
 976                 ULOG_ERR("module is not loaded\n");
 977                 goto err;
 978         }
 979         if (m->state == BUILTIN) {
 980                 ULOG_ERR("module is builtin\n");
 981                 goto err;
 982         }
 983         ret = syscall(__NR_delete_module, m->name, 0);
 984
 985         if (ret)
 986                 ULOG_ERR("unloading the module failed\n");
 987
 988 err:
 989         free_modules();
 990         free_module_folders();
 991
 992         return ret;
 993 }
 994
 995 static int main_lsmod(int argc, char **argv)
 996 {
 997         struct module_node *mn;
 998         struct module *m;
 999         char *dep;
1000
1001         if (scan_loaded_modules())
1002                 return -1;
1003
1004         avl_for_each_element(&modules, mn, avl) {
1005                 if (mn->is_alias)
1006                         continue;
1007                 m = mn->m;
1008                 if (m->state == LOADED) {
1009                         printf("%-20s%8d%3d ",
1010                                 m->name, m->size, m->usage);
1011                         if (m->depends && strcmp(m->depends, "-") && strcmp(m->depends, "")) {
1012                                 dep = m->depends;
1013                                 while (*dep) {
1014                                         printf("%s", dep);
1015                                         dep = dep + strlen(dep) + 1;
1016                                         if (*dep)
1017                                                 printf(",");
1018                                 }
1019                         }
1020                         printf("\n");
1021                 }
1022         }
1023
1024         free_modules();
1025
1026         return 0;
1027 }
1028
1029 static int main_modinfo(int argc, char **argv)
1030 {
1031         struct module *m;
1032         int rv = -1;
1033         char *name;
1034
1035         if (argc != 2)
1036                 return print_usage("modinfo");
1037
1038         if (scan_module_folders())
1039                 return -1;
1040
1041         if (scan_builtin_modules())
1042                 return -1;
1043
1044         name = get_module_name(argv[1]);
1045         m = find_module(name);
1046         if (!m) {
1047                 ULOG_ERR("cannot find module - %s\n", argv[1]);
1048                 goto err;
1049         }
1050
1051         print_modinfo(m);
1052
1053         rv = 0;
1054 err:
1055         free_modules();
1056         free_module_folders();
1057
1058         return rv;
1059 }
1060
1061 static int main_modprobe(int argc, char **argv)
1062 {
1063         struct module_node *mn;
1064         struct module *m;
1065         int exit_code = 0;
1066         int load_fail;
1067         int log_level = LOG_WARNING;
1068         int opt;
1069         bool quiet = false;
1070         bool use_all = false;
1071
1072         while ((opt = getopt(argc, argv, "aqv")) != -1 ) {
1073                 switch (opt) {
1074                         case 'a':
1075                                 use_all = true;
1076                                 break;
1077                         case 'q': /* shhhh! */
1078                                 quiet = true;
1079                                 break;
1080                         case 'v':
1081                                 log_level = LOG_DEBUG;
1082                                 break;
1083                         default: /* '?' */
1084                                 return print_modprobe_usage();
1085                                 break;
1086                         }
1087         }
1088
1089         if (optind >= argc)
1090                 return print_modprobe_usage(); /* expected module after options */
1091
1092         /* after print_modprobe_usage() so it won't be filtered out */
1093         ulog_threshold(log_level);
1094
1095         if (scan_module_folders())
1096                 return -1;
1097
1098         if (scan_loaded_modules())
1099                 return -1;
1100
1101         if (scan_builtin_modules())
1102                 return -1;
1103
1104         do {
1105                 char *name;
1106
1107                 name = get_module_name(argv[optind]);
1108                 m = find_module(name);
1109
1110                 if (m && m->state == BLACKLISTED) {
1111                         if (!quiet)
1112                                 ULOG_INFO("%s is blacklisted\n", name);
1113                 } else if (m && m->state == LOADED) {
1114                         if (!quiet)
1115                                 ULOG_INFO("%s is already loaded\n", name);
1116                 } else if (m && m->state == BUILTIN) {
1117                         if (!quiet)
1118                                 ULOG_INFO("%s is builtin\n", name);
1119                 } else if (!m) {
1120                         if (!quiet)
1121                                 ULOG_ERR("failed to find a module named %s\n", name);
1122                         exit_code = -1;
1123                 } else {
1124                         m->state = PROBE;
1125                 }
1126
1127                 optind++;
1128         } while (use_all && optind < argc);
1129
1130         load_fail = load_modprobe(true);
1131         if (load_fail) {
1132                 ULOG_ERR("%d module%s could not be probed\n",
1133                          load_fail, (load_fail == 1) ? ("") : ("s"));
1134
1135                 avl_for_each_element(&modules, mn, avl) {
1136                         if (mn->is_alias)
1137                                 continue;
1138                         m = mn->m;
1139                         if ((m->state == PROBE) || m->error)
1140                                 ULOG_ERR("- %s\n", m->name);
1141                 }
1142
1143                 exit_code = -1;
1144         }
1145
1146         free_modules();
1147         free_module_folders();
1148
1149         return exit_code;
1150 }
1151
1152 static int main_loader(int argc, char **argv)
1153 {
1154         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
1155         char *dir = "/etc/modules.d/";
1156         struct module_node *mn;
1157         struct module *m;
1158         glob_t gl;
1159         char *path;
1160         int ret = 0, fail, j;
1161
1162         if (argc > 1)
1163                 dir = argv[1];
1164
1165         path = malloc(strlen(dir) + 2);
1166         if (!path) {
1167                 ULOG_ERR("out of memory\n");
1168                 return -1;
1169         }
1170
1171         strcpy(path, dir);
1172         strcat(path, "*");
1173
1174         if (scan_module_folders()) {
1175                 ret = -1;
1176                 goto free_path;
1177         }
1178
1179         if (scan_loaded_modules()) {
1180                 ret = -1;
1181                 goto free_path;
1182         }
1183
1184         ULOG_INFO("loading kernel modules from %s\n", path);
1185
1186         if (glob(path, gl_flags, NULL, &gl) < 0)
1187                 goto out;
1188
1189         for (j = 0; j < gl.gl_pathc; j++) {
1190                 FILE *fp = fopen(gl.gl_pathv[j], "r");
1191                 size_t mod_len = 0;
1192                 char *mod = NULL;
1193
1194                 if (!fp) {
1195                         ULOG_ERR("failed to open %s\n", gl.gl_pathv[j]);
1196                         continue;
1197                 }
1198
1199                 while (getline(&mod, &mod_len, fp) > 0) {
1200                         char *nl = strchr(mod, '\n');
1201                         struct module *m;
1202                         char *opts;
1203
1204                         if (nl)
1205                                 *nl = '\0';
1206
1207                         opts = strchr(mod, ' ');
1208                         if (opts)
1209                                 *opts++ = '\0';
1210
1211                         m = find_module(get_module_name(mod));
1212                         if (!m || m->state == LOADED || m->state == BLACKLISTED)
1213                                 continue;
1214
1215                         if (opts) {
1216                                 if (m->opts) {
1217                                         char *prev = m->opts;
1218
1219                                         fail = asprintf(&m->opts, "%s %s", prev, opts);
1220                                         free(prev);
1221                                         if (fail < 0) {
1222                                                 ULOG_ERR("out of memory for opts %s\n", opts);
1223                                                 free(mod);
1224                                                 fclose(fp);
1225                                                 ret = -1;
1226                                                 goto out;
1227                                         }
1228                                 } else {
1229                                         m->opts = strdup(opts);
1230                                 }
1231                         }
1232                         m->state = PROBE;
1233                         if (basename(gl.gl_pathv[j])[0] - '0' <= 9)
1234                                 load_modprobe(false);
1235
1236                 }
1237                 free(mod);
1238                 fclose(fp);
1239         }
1240
1241         fail = load_modprobe(true);
1242
1243         if (fail) {
1244                 ULOG_ERR("%d module%s could not be probed\n",
1245                          fail, (fail == 1) ? ("") : ("s"));
1246
1247                 avl_for_each_element(&modules, mn, avl) {
1248                         if (mn->is_alias)
1249                                 continue;
1250                         m = mn->m;
1251                         if ((m->state == PROBE) || (m->error))
1252                                 ULOG_ERR("- %s - %d\n", m->name, deps_available(m, 1));
1253                 }
1254         } else {
1255                 ULOG_INFO("done loading kernel modules from %s\n", path);
1256         }
1257
1258 out:
1259         globfree(&gl);
1260         free_modules();
1261         free_module_folders();
1262 free_path:
1263         free(path);
1264
1265         return ret;
1266 }
1267
1268 static inline char weight(char c)
1269 {
1270         return c == '_' ? '-' : c;
1271 }
1272
1273 static int avl_modcmp(const void *k1, const void *k2, void *ptr)
1274 {
1275         const char *s1 = k1;
1276         const char *s2 = k2;
1277
1278         while (*s1 && (weight(*s1) == weight(*s2)))
1279         {
1280                 s1++;
1281                 s2++;
1282         }
1283
1284         return (unsigned char)weight(*s1) - (unsigned char)weight(*s2);
1285 }
1286
1287 static void
1288 load_options(void)
1289 {
1290         static char buf[512];
1291         char *s;
1292         FILE *f;
1293
1294         f = fopen("/etc/modules.conf", "r");
1295         if (!f)
1296                 return;
1297
1298         while ((s = fgets(buf, sizeof(buf), f)) != NULL) {
1299                 char *c, *cmd, *mod;
1300
1301                 while (isspace(*s))
1302                         s++;
1303
1304                 c = strchr(s, '#');
1305                 if (c)
1306                         *c = 0;
1307
1308                 while (isspace(*s))
1309                         s++;
1310
1311                 c = s + strlen(s);
1312                 while (c > s && isspace(c[-1])) {
1313                         c[-1] = 0;
1314                         c--;
1315                 }
1316
1317                 cmd = strsep(&s, " \t");
1318                 if (!cmd || !*cmd)
1319                         continue;
1320
1321                 while (isspace(*s))
1322                         s++;
1323
1324                 mod = strsep(&s, " \t");
1325                 if (!mod || !*mod)
1326                         continue;
1327
1328                 if (!strcmp(cmd, "blacklist")) {
1329                         kvlist_set(&options, mod, "\x01");
1330                         continue;
1331                 }
1332
1333                 if (!strcmp(cmd, "options")) {
1334                         char *prev = kvlist_get(&options, mod);
1335                         char *val = NULL;
1336
1337                         while (isspace(*s))
1338                                 s++;
1339
1340                         if (!*s)
1341                                 continue;
1342
1343                         if (prev && prev[0] == '\x01')
1344                                 continue;
1345
1346                         if (!prev) {
1347                                 kvlist_set(&options, mod, s);
1348                                 continue;
1349                         }
1350
1351                         if (asprintf(&val, "%s %s", prev, s) < 0)
1352                                 continue;
1353
1354                         kvlist_set(&options, mod, val);
1355                         free(val);
1356                         continue;
1357                 }
1358         }
1359
1360         fclose(f);
1361 }
1362
1363 int main(int argc, char **argv)
1364 {
1365         char *exec = basename(*argv);
1366
1367         avl_init(&modules, avl_modcmp, false, NULL);
1368         if (!strcmp(exec, "insmod"))
1369                 return main_insmod(argc, argv);
1370
1371         if (!strcmp(exec, "rmmod"))
1372                 return main_rmmod(argc, argv);
1373
1374         if (!strcmp(exec, "lsmod"))
1375                 return main_lsmod(argc, argv);
1376
1377         if (!strcmp(exec, "modinfo"))
1378                 return main_modinfo(argc, argv);
1379
1380         load_options();
1381
1382         if (!strcmp(exec, "modprobe"))
1383                 return main_modprobe(argc, argv);
1384
1385         ulog_open(ULOG_KMSG, LOG_USER, "kmodloader");
1386         return main_loader(argc, argv);
1387 }