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                 goto out;
 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 struct module* get_module_info(const char *module, const char *name)
 368 {
 369         const bool is_builtin = (module == NULL);
 370         unsigned int offset, size;
 371         char *map = MAP_FAILED, *strings, *dep = NULL;
 372         const char **aliases = NULL;
 373         const char **aliasesr;
 374         const char *mpath = NULL;
 375         char path[350], **f;
 376         int fd = -1, naliases = 0;
 377         struct module *m = NULL;
 378         struct stat s;
 379
 380         if (is_builtin)
 381                 for (f = module_folders; *f; f++) {
 382                         snprintf(path, sizeof(path), "%s%s", *f, MOD_BUILTIN_MODINFO);
 383                         if (!stat(path, &s) && S_ISREG(s.st_mode)) {
 384                                 mpath = path;
 385                                 break;
 386                         }
 387                 }
 388         else
 389                 mpath = module;
 390
 391         if (!mpath) {
 392                 ULOG_ERR("cannot find modinfo path of module - %s\n", name);
 393                 goto out;
 394         }
 395
 396         fd = open(mpath, O_RDONLY);
 397         if (fd < 0) {
 398                 ULOG_ERR("failed to open %s\n", mpath);
 399                 goto out;
 400         }
 401
 402         if (fstat(fd, &s) == -1) {
 403                 ULOG_ERR("failed to stat %s\n", mpath);
 404                 goto out;
 405         }
 406
 407         map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
 408         if (map == MAP_FAILED) {
 409                 ULOG_ERR("failed to mmap %s\n", mpath);
 410                 goto out;
 411         }
 412
 413         if (is_builtin) {
 414                 offset = 0;
 415                 size = s.st_size;
 416         } else if (elf_find_section(map, ".modinfo", &offset, &size)) {
 417                 ULOG_ERR("failed to load the .modinfo section from %s\n", mpath);
 418                 goto out;
 419         }
 420
 421         strings = map + offset;
 422         while (true) {
 423                 char *sep;
 424                 int len;
 425
 426                 while (!strings[0])
 427                         strings++;
 428                 if (strings >= map + offset + size)
 429                         break;
 430                 if (is_builtin) {
 431                         sep = strstr(strings, ".");
 432                         if (!sep)
 433                                 break;
 434                         if (strlen(name) == (sep - strings) &&
 435                             !strncmp(strings, name, sep - strings))
 436                                 strings = sep + 1;
 437                         else
 438                                 goto next_string;
 439                 }
 440                 sep = strstr(strings, "=");
 441                 if (!sep)
 442                         break;
 443                 len = sep - strings;
 444                 sep++;
 445                 if (!strncmp(strings, "depends=", len + 1))
 446                         dep = sep;
 447                 else if (!strncmp(strings, "alias=", len + 1)) {
 448                         aliasesr = realloc(aliases, sizeof(sep) * (naliases + 1));
 449                         if (!aliasesr) {
 450                                 ULOG_ERR("out of memory\n");
 451                                 goto out;
 452                         }
 453
 454                         aliases = aliasesr;
 455                         aliases[naliases++] = sep;
 456                 }
 457 next_string:
 458                 strings = &sep[strlen(sep)];
 459         }
 460
 461         m = alloc_module(name, aliases, naliases, dep, is_builtin ? 0 : s.st_size);
 462
 463         if (m)
 464                 m->state = is_builtin ? BUILTIN : SCANNED;
 465
 466 out:
 467         if (map != MAP_FAILED)
 468                 munmap(map, s.st_size);
 469
 470         if (fd >= 0)
 471                 close(fd);
 472
 473         free(aliases);
 474
 475         return m;
 476 }
 477
 478 static int scan_builtin_modules(void)
 479 {
 480         char **p, path[350];
 481         size_t buf_len = 0;
 482         char *buf = NULL;
 483         struct stat st;
 484         FILE *fp = NULL;
 485         int rv = -1;
 486
 487         if (!module_folders && init_module_folders())
 488                 goto err;
 489         for (p = module_folders; *p; p++) {
 490                 snprintf(path, sizeof(path), "%s%s", *p, MOD_BUILTIN);
 491                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
 492                         fp = fopen(path, "r");
 493                         if (fp)
 494                                 break;
 495                 }
 496         }
 497         if (!fp)
 498                 goto out;       /* OK if modules.builtin unavailable */
 499
 500         while (getline(&buf, &buf_len, fp) > 0) {
 501                 struct module *m;
 502                 char *name;
 503
 504                 name = get_module_name(buf);
 505                 if (!name)
 506                         continue;
 507                 m = find_module(name);
 508                 if (m && !strcmp(m->name, name)) {
 509                         ULOG_WARN("found duplicate builtin module %s\n", name);
 510                         continue;
 511                 }
 512                 m = get_module_info(NULL, name);
 513                 if (!m) {
 514                         ULOG_ERR("failed to find info for builtin module %s\n", name);
 515                         goto err;
 516                 }
 517         }
 518 out:
 519         rv = 0;
 520 err:
 521         free(buf);
 522         fclose(fp);
 523
 524         return rv;
 525 }
 526
 527 static int scan_module_folder(const char *dir)
 528 {
 529         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 530         char *path;
 531         glob_t gl;
 532         int j, rv = 0;
 533
 534         path = alloca(strlen(dir) + sizeof("*.ko") + 1);
 535         sprintf(path, "%s*.ko", dir);
 536
 537         if (glob(path, gl_flags, NULL, &gl) < 0)
 538                 return -1;
 539
 540         for (j = 0; j < gl.gl_pathc; j++) {
 541                 char *name = get_module_name(gl.gl_pathv[j]);
 542                 struct module *m;
 543                 char *opts;
 544
 545                 if (!name)
 546                         continue;
 547
 548                 m = find_module(name);
 549                 if (m)
 550                         continue;
 551
 552                 m = get_module_info(gl.gl_pathv[j], name);
 553                 if (!m) {
 554                         rv |= -1;
 555                         continue;
 556                 }
 557
 558                 opts = kvlist_get(&options, name);
 559                 if (!opts)
 560                         continue;
 561
 562                 if (*opts == '\x01')
 563                         m->state = BLACKLISTED;
 564                 else
 565                         m->opts = strdup(opts);
 566         }
 567
 568         globfree(&gl);
 569
 570         return rv;
 571 }
 572
 573 static int scan_module_folders(void)
 574 {
 575         int rv = 0;
 576         char **p;
 577
 578         if (init_module_folders())
 579                 return -1;
 580
 581         for (p = module_folders; *p; p++)
 582                 rv |= scan_module_folder(*p);
 583
 584         return rv;
 585 }
 586
 587 static int print_modinfo(const struct module *m)
 588 {
 589         const bool is_builtin = (m->state == BUILTIN);
 590         unsigned int offset, size;
 591         struct param *p;
 592         struct stat s;
 593         char *map = MAP_FAILED, *strings, **f;
 594         char path[350], *mpath = NULL;
 595         int fd, rv = -1;
 596
 597         LIST_HEAD(params);
 598
 599         if (is_builtin)
 600                 for (f = module_folders; *f; f++) {
 601                         snprintf(path, sizeof(path), "%s%s", *f, MOD_BUILTIN_MODINFO);
 602                         if (!stat(path, &s) && S_ISREG(s.st_mode)) {
 603                                 mpath = path;
 604                                 break;
 605                         }
 606                 }
 607         else
 608                 mpath = get_module_path(m->name);
 609
 610         if (!mpath) {
 611                 ULOG_ERR("cannot find modinfo path of module - %s\n", m->name);
 612                 return -1;
 613         }
 614
 615         fd = open(mpath, O_RDONLY);
 616         if (fd < 0) {
 617                 ULOG_ERR("failed to open %s\n", mpath);
 618                 goto out;
 619         }
 620
 621         if (fstat(fd, &s) == -1) {
 622                 ULOG_ERR("failed to stat %s\n", mpath);
 623                 goto out;
 624         }
 625
 626         map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
 627         if (map == MAP_FAILED) {
 628                 ULOG_ERR("failed to mmap %s\n", mpath);
 629                 goto out;
 630         }
 631
 632         if (is_builtin) {
 633                 offset = 0;
 634                 size = s.st_size;
 635         } else if (elf_find_section(map, ".modinfo", &offset, &size)) {
 636                 ULOG_ERR("failed to load the .modinfo section from %s\n", mpath);
 637                 goto out;
 638         }
 639
 640         strings = map + offset;
 641         if (is_builtin)
 642                 printf("name:\t\t%s\n", m->name);
 643         printf("filename:\t%s\n", is_builtin ? "(builtin)" : mpath);
 644         while (true) {
 645                 char *pname, *pdata;
 646                 char *dup = NULL;
 647                 char *sep, *sep2;
 648
 649                 while (!strings[0])
 650                         strings++;
 651                 if (strings >= map + offset + size)
 652                         break;
 653                 if (is_builtin) {
 654                         sep = strstr(strings, ".");
 655                         if (!sep)
 656                                 break;
 657                         if (strlen(m->name) == (sep - strings) &&
 658                             !strncmp(strings, m->name, sep - strings))
 659                                 strings = sep + 1;
 660                         else
 661                                 goto next_string;
 662                 }
 663                 sep = strstr(strings, "=");
 664                 if (!sep)
 665                         break;
 666                 dup = strndup(strings, sep - strings);
 667                 sep++;
 668                 if (strncmp(strings, "parm", 4)) {
 669                         if (strlen(dup) < 7)
 670                                 printf("%s:\t\t%s\n",  dup, sep);
 671                         else
 672                                 printf("%s:\t%s\n",  dup, sep);
 673                 } else {
 674                         sep2 = strstr(sep, ":");
 675                         if (!sep2)
 676                                 break;
 677                         pname = strndup(sep, sep2 - sep);
 678                         sep2++;
 679                         pdata = strdup(sep2);
 680
 681                         list_for_each_entry(p, &params, list)
 682                                 if (!strcmp(pname, p->name))
 683                                         break;
 684
 685                         if (list_entry_is_h(p, &params, list)) {
 686                                 p = alloca(sizeof(*p));
 687                                 p->name = pname;
 688                                 p->desc = p->type = NULL;
 689                                 list_add(&p->list, &params);
 690                         } else {
 691                                 free(pname);
 692                         }
 693
 694                         if (!strcmp(dup, "parmtype"))
 695                                 p->type = pdata;
 696                         else
 697                                 p->desc = pdata;
 698                 }
 699 next_string:
 700                 strings = &sep[strlen(sep)];
 701                 if (dup)
 702                         free(dup);
 703         }
 704
 705         list_for_each_entry(p, &params, list) {
 706                 printf("parm:\t\t%s",  p->name);
 707                 if (p->desc)
 708                         printf(":%s", p->desc);
 709                 if (p->type)
 710                         printf(" (%s)", p->type);
 711                 printf("\n");
 712                 free(p->name);
 713                 free(p->desc);
 714                 free(p->type);
 715         }
 716
 717         rv = 0;
 718
 719 out:
 720         if (map != MAP_FAILED)
 721                 munmap(map, s.st_size);
 722
 723         if (fd >= 0)
 724                 close(fd);
 725
 726         return rv;
 727 }
 728
 729 static int deps_available(struct module *m, int verbose)
 730 {
 731         char *dep;
 732         int err = 0;
 733
 734         if (!m->depends || !strcmp(m->depends, "-") || !strcmp(m->depends, ""))
 735                 return 0;
 736
 737         dep = m->depends;
 738
 739         while (*dep) {
 740                 m = find_module(dep);
 741
 742                 if (verbose && !m)
 743                         ULOG_ERR("missing dependency %s\n", dep);
 744                 if (verbose && m && (m->state != LOADED))
 745                         ULOG_ERR("dependency not loaded %s\n", dep);
 746                 if (!m || (m->state != LOADED))
 747                         err++;
 748                 dep += strlen(dep) + 1;
 749         }
 750
 751         return err;
 752 }
 753
 754 static int insert_module(char *path, const char *options)
 755 {
 756         void *data = 0;
 757         struct stat s;
 758         int fd, ret = -1;
 759
 760         if (!path) {
 761                 ULOG_ERR("Path not specified\n");
 762                 return ret;
 763         }
 764
 765         if (stat(path, &s)) {
 766                 ULOG_ERR("missing module %s\n", path);
 767                 return ret;
 768         }
 769
 770         fd = open(path, O_RDONLY);
 771         if (fd < 0) {
 772                 ULOG_ERR("cannot open %s\n", path);
 773                 return ret;
 774         }
 775
 776         data = malloc(s.st_size);
 777         if (!data) {
 778                 ULOG_ERR("out of memory\n");
 779                 goto out;
 780         }
 781
 782         if (read(fd, data, s.st_size) == s.st_size) {
 783                 ret = syscall(__NR_init_module, data, (unsigned long) s.st_size, options);
 784                 if (errno == EEXIST)
 785                         ret = 0;
 786         }
 787         else
 788                 ULOG_ERR("failed to read full module %s\n", path);
 789
 790 out:
 791         close(fd);
 792         free(data);
 793
 794         return ret;
 795 }
 796
 797 static void load_moddeps(struct module *_m)
 798 {
 799         char *dep;
 800         struct module *m;
 801
 802         if (!strcmp(_m->depends, "-") || !strcmp(_m->depends, ""))
 803                 return;
 804
 805         dep = _m->depends;
 806
 807         while (*dep) {
 808                 m = find_module(dep);
 809
 810                 if (!m)
 811                         ULOG_ERR("failed to find dependency %s\n", dep);
 812                 if (m && (m->state != LOADED)) {
 813                         m->state = PROBE;
 814                         load_moddeps(m);
 815                 }
 816
 817                 dep = dep + strlen(dep) + 1;
 818         }
 819 }
 820
 821 static int load_modprobe(bool allow_load_retry)
 822 {
 823         int loaded, skipped, failed;
 824         struct module_node *mn;
 825         struct module *m;
 826         bool load_retry = false;
 827         static bool first_iteration = true;
 828
 829         avl_for_each_element(&modules, mn, avl) {
 830                 if (mn->is_alias)
 831                         continue;
 832                 m = mn->m;
 833                 if (m->state == PROBE)
 834                         load_moddeps(m);
 835         }
 836
 837         do {
 838                 loaded = 0;
 839                 skipped = 0;
 840                 failed = 0;
 841                 avl_for_each_element(&modules, mn, avl) {
 842                         if (mn->is_alias)
 843                                 continue;
 844                         m = mn->m;
 845                         if ((m->state == PROBE) && (!deps_available(m, 0)) && (!m->error || load_retry)) {
 846                                 if (!insert_module(get_module_path(m->name), (m->opts) ? (m->opts) : (""))) {
 847                                         m->state = LOADED;
 848                                         m->error = 0;
 849                                         loaded++;
 850                                         continue;
 851                                 }
 852
 853                                 m->error = 1;
 854                         }
 855
 856                         if (m->error)
 857                                 failed++;
 858                         else if (m->state == PROBE)
 859                                 skipped++;
 860                 }
 861
 862                 if (allow_load_retry) {
 863                         /* if we can't load anything else let's try to load failed modules */
 864                         load_retry = loaded ? (failed && !skipped) : (failed && !load_retry && !first_iteration);
 865                 }
 866
 867                 first_iteration = false;
 868         } while (loaded || load_retry);
 869
 870         return skipped + failed;
 871 }
 872
 873 static int print_insmod_usage(void)
 874 {
 875         ULOG_INFO("Usage:\n\tinsmod filename [args]\n");
 876
 877         return -1;
 878 }
 879
 880 static int print_modprobe_usage(void)
 881 {
 882         ULOG_INFO(
 883                 "Usage:\n"
 884                 "\tmodprobe [-q] [-v] filename\n"
 885                 "\tmodprobe -a [-q] [-v] filename [filename...]\n"
 886         );
 887
 888         return -1;
 889 }
 890
 891 static int print_usage(char *arg)
 892 {
 893         ULOG_INFO("Usage:\n\t%s module\n", arg);
 894
 895         return -1;
 896 }
 897
 898 static int main_insmod(int argc, char **argv)
 899 {
 900         char *name, *cur, *options;
 901         int i, ret, len;
 902
 903         if (argc < 2)
 904                 return print_insmod_usage();
 905
 906         name = get_module_name(argv[1]);
 907         if (!name) {
 908                 ULOG_ERR("cannot find module - %s\n", argv[1]);
 909                 return -1;
 910         }
 911
 912         if (scan_loaded_modules())
 913                 return -1;
 914
 915         if (find_module(name)) {
 916                 ULOG_ERR("module is already loaded - %s\n", name);
 917                 return -1;
 918
 919         }
 920
 921         free_modules();
 922
 923         for (len = 0, i = 2; i < argc; i++)
 924                 len += strlen(argv[i]) + 1;
 925
 926         options = malloc(len);
 927         if (!options) {
 928                 ULOG_ERR("out of memory\n");
 929                 ret = -1;
 930                 goto err;
 931         }
 932
 933         options[0] = 0;
 934         cur = options;
 935         for (i = 2; i < argc; i++) {
 936                 if (options[0]) {
 937                         *cur = ' ';
 938                         cur++;
 939                 }
 940                 cur += sprintf(cur, "%s", argv[i]);
 941         }
 942
 943         if (init_module_folders()) {
 944                 fprintf(stderr, "Failed to find the folder holding the modules\n");
 945                 ret = -1;
 946                 goto err;
 947         }
 948
 949         if (get_module_path(argv[1])) {
 950                 name = argv[1];
 951         } else if (!get_module_path(name)) {
 952                 fprintf(stderr, "Failed to find %s. Maybe it is a built in module ?\n", name);
 953                 ret = -1;
 954                 goto err;
 955         }
 956
 957         ret = insert_module(get_module_path(name), options);
 958         if (ret)
 959                 ULOG_ERR("failed to insert %s\n", get_module_path(name));
 960
 961 err:
 962         free(options);
 963         return ret;
 964 }
 965
 966 static int main_rmmod(int argc, char **argv)
 967 {
 968         struct module *m;
 969         char *name;
 970         int ret;
 971
 972         if (argc != 2)
 973                 return print_usage("rmmod");
 974
 975         if (scan_loaded_modules())
 976                 return -1;
 977
 978         if (scan_builtin_modules())
 979                 return -1;
 980
 981         name = get_module_name(argv[1]);
 982         m = find_module(name);
 983         if (!m) {
 984                 ULOG_ERR("module is not loaded\n");
 985                 return -1;
 986         }
 987         if (m->state == BUILTIN) {
 988                 ULOG_ERR("module is builtin\n");
 989                 return -1;
 990         }
 991         ret = syscall(__NR_delete_module, m->name, 0);
 992
 993         if (ret)
 994                 ULOG_ERR("unloading the module failed\n");
 995
 996         free_modules();
 997
 998         return ret;
 999 }
1000
1001 static int main_lsmod(int argc, char **argv)
1002 {
1003         struct module_node *mn;
1004         struct module *m;
1005         char *dep;
1006
1007         if (scan_loaded_modules())
1008                 return -1;
1009
1010         avl_for_each_element(&modules, mn, avl) {
1011                 if (mn->is_alias)
1012                         continue;
1013                 m = mn->m;
1014                 if (m->state == LOADED) {
1015                         printf("%-20s%8d%3d ",
1016                                 m->name, m->size, m->usage);
1017                         if (m->depends && strcmp(m->depends, "-") && strcmp(m->depends, "")) {
1018                                 dep = m->depends;
1019                                 while (*dep) {
1020                                         printf("%s", dep);
1021                                         dep = dep + strlen(dep) + 1;
1022                                         if (*dep)
1023                                                 printf(",");
1024                                 }
1025                         }
1026                         printf("\n");
1027                 }
1028         }
1029
1030         free_modules();
1031
1032         return 0;
1033 }
1034
1035 static int main_modinfo(int argc, char **argv)
1036 {
1037         struct module *m;
1038         char *name;
1039
1040         if (argc != 2)
1041                 return print_usage("modinfo");
1042
1043         if (scan_module_folders())
1044                 return -1;
1045
1046         if (scan_builtin_modules())
1047                 return -1;
1048
1049         name = get_module_name(argv[1]);
1050         m = find_module(name);
1051         if (!m) {
1052                 ULOG_ERR("cannot find module - %s\n", argv[1]);
1053                 return -1;
1054         }
1055
1056         print_modinfo(m);
1057
1058         return 0;
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
1148         return exit_code;
1149 }
1150
1151 static int main_loader(int argc, char **argv)
1152 {
1153         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
1154         char *dir = "/etc/modules.d/";
1155         struct module_node *mn;
1156         struct module *m;
1157         glob_t gl;
1158         char *path;
1159         int ret = 0, fail, j;
1160
1161         if (argc > 1)
1162                 dir = argv[1];
1163
1164         path = malloc(strlen(dir) + 2);
1165         if (!path) {
1166                 ULOG_ERR("out of memory\n");
1167                 return -1;
1168         }
1169
1170         strcpy(path, dir);
1171         strcat(path, "*");
1172
1173         if (scan_module_folders()) {
1174                 ret = -1;
1175                 goto free_path;
1176         }
1177
1178         if (scan_loaded_modules()) {
1179                 ret = -1;
1180                 goto free_path;
1181         }
1182
1183         ULOG_INFO("loading kernel modules from %s\n", path);
1184
1185         if (glob(path, gl_flags, NULL, &gl) < 0)
1186                 goto out;
1187
1188         for (j = 0; j < gl.gl_pathc; j++) {
1189                 FILE *fp = fopen(gl.gl_pathv[j], "r");
1190                 size_t mod_len = 0;
1191                 char *mod = NULL;
1192
1193                 if (!fp) {
1194                         ULOG_ERR("failed to open %s\n", gl.gl_pathv[j]);
1195                         continue;
1196                 }
1197
1198                 while (getline(&mod, &mod_len, fp) > 0) {
1199                         char *nl = strchr(mod, '\n');
1200                         struct module *m;
1201                         char *opts;
1202
1203                         if (nl)
1204                                 *nl = '\0';
1205
1206                         opts = strchr(mod, ' ');
1207                         if (opts)
1208                                 *opts++ = '\0';
1209
1210                         m = find_module(get_module_name(mod));
1211                         if (!m || m->state == LOADED || m->state == BLACKLISTED)
1212                                 continue;
1213
1214                         if (opts) {
1215                                 if (m->opts) {
1216                                         char *prev = m->opts;
1217
1218                                         fail = asprintf(&m->opts, "%s %s", prev, opts);
1219                                         free(prev);
1220                                         if (fail < 0) {
1221                                                 ULOG_ERR("out of memory for opts %s\n", opts);
1222                                                 free(mod);
1223                                                 fclose(fp);
1224                                                 ret = -1;
1225                                                 goto out;
1226                                         }
1227                                 } else {
1228                                         m->opts = strdup(opts);
1229                                 }
1230                         }
1231                         m->state = PROBE;
1232                         if (basename(gl.gl_pathv[j])[0] - '0' <= 9)
1233                                 load_modprobe(false);
1234
1235                 }
1236                 free(mod);
1237                 fclose(fp);
1238         }
1239
1240         fail = load_modprobe(true);
1241
1242         if (fail) {
1243                 ULOG_ERR("%d module%s could not be probed\n",
1244                          fail, (fail == 1) ? ("") : ("s"));
1245
1246                 avl_for_each_element(&modules, mn, avl) {
1247                         if (mn->is_alias)
1248                                 continue;
1249                         m = mn->m;
1250                         if ((m->state == PROBE) || (m->error))
1251                                 ULOG_ERR("- %s - %d\n", m->name, deps_available(m, 1));
1252                 }
1253         } else {
1254                 ULOG_INFO("done loading kernel modules from %s\n", path);
1255         }
1256
1257 out:
1258         globfree(&gl);
1259 free_path:
1260         free(path);
1261
1262         return ret;
1263 }
1264
1265 static inline char weight(char c)
1266 {
1267         return c == '_' ? '-' : c;
1268 }
1269
1270 static int avl_modcmp(const void *k1, const void *k2, void *ptr)
1271 {
1272         const char *s1 = k1;
1273         const char *s2 = k2;
1274
1275         while (*s1 && (weight(*s1) == weight(*s2)))
1276         {
1277                 s1++;
1278                 s2++;
1279         }
1280
1281         return (unsigned char)weight(*s1) - (unsigned char)weight(*s2);
1282 }
1283
1284 static void
1285 load_options(void)
1286 {
1287         static char buf[512];
1288         char *s;
1289         FILE *f;
1290
1291         f = fopen("/etc/modules.conf", "r");
1292         if (!f)
1293                 return;
1294
1295         while ((s = fgets(buf, sizeof(buf), f)) != NULL) {
1296                 char *c, *cmd, *mod;
1297
1298                 while (isspace(*s))
1299                         s++;
1300
1301                 c = strchr(s, '#');
1302                 if (c)
1303                         *c = 0;
1304
1305                 while (isspace(*s))
1306                         s++;
1307
1308                 c = s + strlen(s);
1309                 while (c > s && isspace(c[-1])) {
1310                         c[-1] = 0;
1311                         c--;
1312                 }
1313
1314                 cmd = strsep(&s, " \t");
1315                 if (!cmd || !*cmd)
1316                         continue;
1317
1318                 while (isspace(*s))
1319                         s++;
1320
1321                 mod = strsep(&s, " \t");
1322                 if (!mod || !*mod)
1323                         continue;
1324
1325                 if (!strcmp(cmd, "blacklist")) {
1326                         kvlist_set(&options, mod, "\x01");
1327                         continue;
1328                 }
1329
1330                 if (!strcmp(cmd, "options")) {
1331                         char *prev = kvlist_get(&options, mod);
1332                         char *val = NULL;
1333
1334                         while (isspace(*s))
1335                                 s++;
1336
1337                         if (!*s)
1338                                 continue;
1339
1340                         if (prev && prev[0] == '\x01')
1341                                 continue;
1342
1343                         if (!prev) {
1344                                 kvlist_set(&options, mod, s);
1345                                 continue;
1346                         }
1347
1348                         if (asprintf(&val, "%s %s", prev, s) < 0)
1349                                 continue;
1350
1351                         kvlist_set(&options, mod, val);
1352                         free(val);
1353                         continue;
1354                 }
1355         }
1356
1357         fclose(f);
1358 }
1359
1360 int main(int argc, char **argv)
1361 {
1362         char *exec = basename(*argv);
1363
1364         avl_init(&modules, avl_modcmp, false, NULL);
1365         if (!strcmp(exec, "insmod"))
1366                 return main_insmod(argc, argv);
1367
1368         if (!strcmp(exec, "rmmod"))
1369                 return main_rmmod(argc, argv);
1370
1371         if (!strcmp(exec, "lsmod"))
1372                 return main_lsmod(argc, argv);
1373
1374         if (!strcmp(exec, "modinfo"))
1375                 return main_modinfo(argc, argv);
1376
1377         load_options();
1378
1379         if (!strcmp(exec, "modprobe"))
1380                 return main_modprobe(argc, argv);
1381
1382         ulog_open(ULOG_KMSG, LOG_USER, "kmodloader");
1383         return main_loader(argc, argv);
1384 }