2 * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
3 * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
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
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.
16 #include <sys/syscall.h>
18 #include <sys/utsname.h>
22 #include <sys/syscall.h>
23 #include <sys/types.h>
35 #include <libubox/avl.h>
36 #include <libubox/avl-cmp.h>
37 #include <libubox/utils.h>
39 #define DEF_MOD_PATH "/lib/modules/%s/"
41 #define LOG(fmt, ...) do { \
42 syslog(LOG_INFO, fmt, ## __VA_ARGS__); \
43 printf("kmod: "fmt, ## __VA_ARGS__); \
65 static struct avl_tree modules;
66 static char *prefix = "";
68 static struct module *find_module(const char *name)
71 return avl_find_element(&modules, name, m, avl);
74 static void free_modules(void)
76 struct module *m, *tmp;
78 avl_remove_all_elements(&modules, m, avl, tmp)
82 static void replace_dash(char *s)
91 static void replace_underscore(char *s)
100 static char* get_module_path(char *name)
102 static char path[256];
110 snprintf(path, 256, "%s" DEF_MOD_PATH "%s.ko", prefix, ver.release, name);
116 snprintf(path, 256, "%s" DEF_MOD_PATH "%s.ko", prefix, ver.release, name);
117 replace_underscore(path);
125 static char* get_module_name(char *path)
127 static char name[32];
130 strncpy(name, basename(path), sizeof(name));
132 t = strstr(name, ".ko");
141 static int elf_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
143 const char *secnames;
148 e = (Elf64_Ehdr *) map;
149 sh = (Elf64_Shdr *) (map + e->e_shoff);
151 secnames = map + sh[e->e_shstrndx].sh_offset;
152 for (i = 0; i < e->e_shnum; i++) {
153 if (!strcmp(section, secnames + sh[i].sh_name)) {
154 *size = sh[i].sh_size;
155 *offset = sh[i].sh_offset;
163 static int elf_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
165 const char *secnames;
170 e = (Elf32_Ehdr *) map;
171 sh = (Elf32_Shdr *) (map + e->e_shoff);
173 secnames = map + sh[e->e_shstrndx].sh_offset;
174 for (i = 0; i < e->e_shnum; i++) {
175 if (!strcmp(section, secnames + sh[i].sh_name)) {
176 *size = sh[i].sh_size;
177 *offset = sh[i].sh_offset;
186 static struct module *
187 alloc_module(const char *name, const char *depends, int size)
192 m = calloc_a(sizeof(*m),
193 &_name, strlen(name) + 1,
194 &_dep, depends ? strlen(depends) + 2 : 0);
198 m->avl.key = m->name = strcpy(_name, name);
202 m->depends = strcpy(_dep, depends);
212 avl_insert(&modules, &m->avl);
217 static int scan_loaded_modules(void)
223 fp = fopen("/proc/modules", "r");
225 LOG("failed to open /proc/modules\n");
229 while (getline(&buf, &buf_len, fp) > 0) {
233 m.name = strtok(buf, " ");
234 m.size = atoi(strtok(NULL, " "));
235 m.usage = atoi(strtok(NULL, " "));
236 m.depends = strtok(NULL, " ");
238 if (!m.name || !m.depends)
241 n = alloc_module(m.name, m.depends, m.size);
251 static struct module* get_module_info(const char *module, const char *name)
253 int fd = open(module, O_RDONLY);
254 unsigned int offset, size;
255 char *map, *strings, *dep = NULL;
260 LOG("failed to open %s\n", module);
264 if (fstat(fd, &s) == -1) {
265 LOG("failed to stat %s\n", module);
269 map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
270 if (map == MAP_FAILED) {
271 LOG("failed to mmap %s\n", module);
275 if (elf_find_section(map, ".modinfo", &offset, &size)) {
276 LOG("failed to load the .modinfo section from %s\n", module);
280 strings = map + offset;
281 while (strings && (strings < map + offset + size)) {
287 sep = strstr(strings, "=");
292 if (!strncmp(strings, "depends=", len + 1))
294 strings = &sep[strlen(sep)];
297 m = alloc_module(name, dep, s.st_size);
306 static int scan_module_folder(void)
308 int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
315 path = alloca(sizeof(DEF_MOD_PATH "*.ko") + strlen(ver.release) + 1);
316 sprintf(path, DEF_MOD_PATH "*.ko", ver.release);
318 if (glob(path, gl_flags, NULL, &gl) < 0)
321 for (j = 0; j < gl.gl_pathc; j++) {
322 char *name = get_module_name(gl.gl_pathv[j]);
328 m = find_module(name);
330 get_module_info(gl.gl_pathv[j], name);
338 static int print_modinfo(char *module)
340 int fd = open(module, O_RDONLY);
341 unsigned int offset, size;
346 LOG("failed to open %s\n", module);
350 if (fstat(fd, &s) == -1) {
351 LOG("failed to stat %s\n", module);
355 map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
356 if (map == MAP_FAILED) {
357 LOG("failed to mmap %s\n", module);
361 if (elf_find_section(map, ".modinfo", &offset, &size)) {
362 LOG("failed to load the .modinfo section from %s\n", module);
366 strings = map + offset;
367 printf("module:\t\t%s\n", module);
368 while (strings && (strings < map + offset + size)) {
374 sep = strstr(strings, "=");
377 dup = strndup(strings, sep - strings);
379 if (strncmp(strings, "parm", 4)) {
381 printf("%s:\t\t%s\n", dup, sep);
383 printf("%s:\t%s\n", dup, sep);
385 strings = &sep[strlen(sep)];
393 static int deps_available(struct module *m, int verbose)
398 if (!strcmp(m->depends, "_") || !strcmp(m->depends, ""))
404 m = find_module(dep);
407 LOG("missing dependency %s\n", dep);
408 if (verbose && m && (m->state != LOADED))
409 LOG("dependency not loaded %s\n", dep);
410 if (!m || (m->state != LOADED))
412 dep += strlen(dep) + 1;
418 static int insert_module(char *path, const char *options)
424 if (stat(path, &s)) {
425 LOG("missing module %s\n", path);
429 fd = open(path, O_RDONLY);
431 LOG("cannot open %s\n", path);
435 data = malloc(s.st_size);
436 if (read(fd, data, s.st_size) == s.st_size)
437 ret = syscall(__NR_init_module, data, s.st_size, options);
439 LOG("failed to read full module %s\n", path);
447 static void load_moddeps(struct module *_m)
452 if (!strcmp(_m->depends, "_") || !strcmp(_m->depends, ""))
458 m = find_module(dep);
461 LOG("failed to find dependency %s\n", dep);
462 if (m && (m->state != LOADED)) {
467 dep = dep + strlen(dep) + 1;
471 static int iterations = 0;
472 static int load_modprobe(void)
477 avl_for_each_element(&modules, m, avl)
478 if (m->state == PROBE)
484 avl_for_each_element(&modules, m, avl) {
485 if ((m->state == PROBE) && (!deps_available(m, 0))) {
486 if (!insert_module(get_module_path(m->name), "")) {
495 if ((m->state == PROBE) || m->error)
504 static int print_insmod_usage(void)
506 LOG("Usage:\n\tinsmod filename [args]\n");
511 static int print_usage(char *arg)
513 LOG("Usage:\n\t%s module\n", arg);
518 static int main_insmod(int argc, char **argv)
520 char *name, *cur, *options;
524 return print_insmod_usage();
526 name = get_module_name(argv[1]);
528 LOG("cannot find module - %s\n", argv[1]);
532 if (scan_loaded_modules())
535 if (find_module(name)) {
536 LOG("module is already loaded - %s\n", name);
543 for (len = 0, i = 2; i < argc; i++)
544 len += strlen(argv[i]) + 1;
546 options = malloc(len);
549 for (i = 2; i < argc; i++) {
554 cur += sprintf(cur, "%s", argv[i]);
557 ret = insert_module(get_module_path(name), options);
561 LOG("failed to insert %s\n", get_module_path(name));
566 static int main_rmmod(int argc, char **argv)
573 return print_usage("rmmod");
575 if (scan_loaded_modules())
578 name = get_module_name(argv[1]);
579 m = find_module(name);
581 LOG("module is not loaded\n");
586 ret = syscall(__NR_delete_module, name, 0);
589 LOG("unloading the module failed\n");
594 static int main_lsmod(int argc, char **argv)
598 if (scan_loaded_modules())
601 avl_for_each_element(&modules, m, avl)
602 if (m->state == LOADED)
603 printf("%-20s%8d%3d %s\n",
604 m->name, m->size, m->usage,
605 (*m->depends == '-') ? ("") : (m->depends));
612 static int main_modinfo(int argc, char **argv)
617 return print_usage("modinfo");
619 module = get_module_path(argv[1]);
621 LOG("cannot find module - %s\n", argv[1]);
625 print_modinfo(module);
630 static int main_modprobe(int argc, char **argv)
636 return print_usage("modprobe");
638 if (scan_loaded_modules())
641 if (scan_module_folder())
644 name = get_module_name(argv[1]);
645 m = find_module(name);
646 if (m && m->state == LOADED) {
647 LOG("%s is already loaded\n", name);
650 LOG("failed to find a module named %s\n", name);
656 fail = load_modprobe();
659 LOG("%d module%s could not be probed\n",
660 fail, (fail == 1) ? ("") : ("s"));
662 avl_for_each_element(&modules, m, avl)
663 if ((m->state == PROBE) || m->error)
664 LOG("- %s\n", m->name);
673 static int main_loader(int argc, char **argv)
675 int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
676 char *dir = "/etc/modules.d/*";
688 path = malloc(strlen(dir) + 2);
692 if (scan_loaded_modules())
695 if (scan_module_folder())
698 syslog(0, "kmodloader: loading kernel modules from %s\n", path);
700 if (glob(path, gl_flags, NULL, &gl) < 0)
703 for (j = 0; j < gl.gl_pathc; j++) {
704 FILE *fp = fopen(gl.gl_pathv[j], "r");
709 LOG("failed to open %s\n", gl.gl_pathv[j]);
713 while (getline(&mod, &mod_len, fp) > 0) {
714 char *nl = strchr(mod, '\n');
721 opts = strchr(mod, ' ');
725 m = find_module(get_module_name(mod));
726 if (!m || (m->state == LOADED))
730 if (basename(gl.gl_pathv[j])[0] - '0' <= 9)
738 fail = load_modprobe();
739 LOG("ran %d iterations\n", iterations);
742 LOG("%d module%s could not be probed\n",
743 fail, (fail == 1) ? ("") : ("s"));
745 avl_for_each_element(&modules, m, avl)
746 if ((m->state == PROBE) || (m->error))
747 LOG("- %s - %d\n", m->name, deps_available(m, 1));
757 int main(int argc, char **argv)
759 char *exec = basename(*argv);
761 avl_init(&modules, avl_strcmp, false, NULL);
762 if (!strcmp(exec, "insmod"))
763 return main_insmod(argc, argv);
765 if (!strcmp(exec, "rmmod"))
766 return main_rmmod(argc, argv);
768 if (!strcmp(exec, "lsmod"))
769 return main_lsmod(argc, argv);
771 if (!strcmp(exec, "modinfo"))
772 return main_modinfo(argc, argv);
774 if (!strcmp(exec, "modprobe"))
775 return main_modprobe(argc, argv);
777 return main_loader(argc, argv);