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)
93 static void replace_underscore(char *s)
102 static char* get_module_path(char *name)
104 static char path[256];
112 snprintf(path, 256, "%s" DEF_MOD_PATH "%s.ko", prefix, ver.release, name);
118 snprintf(path, 256, "%s" DEF_MOD_PATH "%s.ko", prefix, ver.release, name);
119 replace_underscore(path);
127 static char* get_module_name(char *path)
129 static char name[32];
132 strncpy(name, basename(path), sizeof(name));
134 t = strstr(name, ".ko");
143 static int elf_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
145 const char *secnames;
150 e = (Elf64_Ehdr *) map;
151 sh = (Elf64_Shdr *) (map + e->e_shoff);
153 secnames = map + sh[e->e_shstrndx].sh_offset;
154 for (i = 0; i < e->e_shnum; i++) {
155 if (!strcmp(section, secnames + sh[i].sh_name)) {
156 *size = sh[i].sh_size;
157 *offset = sh[i].sh_offset;
165 static int elf_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
167 const char *secnames;
172 e = (Elf32_Ehdr *) map;
173 sh = (Elf32_Shdr *) (map + e->e_shoff);
175 secnames = map + sh[e->e_shstrndx].sh_offset;
176 for (i = 0; i < e->e_shnum; i++) {
177 if (!strcmp(section, secnames + sh[i].sh_name)) {
178 *size = sh[i].sh_size;
179 *offset = sh[i].sh_offset;
188 static struct module *
189 alloc_module(const char *name, const char *depends, int size)
194 m = calloc_a(sizeof(*m),
195 &_name, strlen(name) + 1,
196 &_dep, depends ? strlen(depends) + 2 : 0);
200 m->avl.key = m->name = strcpy(_name, name);
204 m->depends = strcpy(_dep, depends);
214 avl_insert(&modules, &m->avl);
219 static int scan_loaded_modules(void)
225 fp = fopen("/proc/modules", "r");
227 LOG("failed to open /proc/modules\n");
231 while (getline(&buf, &buf_len, fp) > 0) {
235 m.name = strtok(buf, " ");
236 m.size = atoi(strtok(NULL, " "));
237 m.usage = atoi(strtok(NULL, " "));
238 m.depends = strtok(NULL, " ");
240 if (!m.name || !m.depends)
243 n = alloc_module(m.name, m.depends, m.size);
253 static struct module* get_module_info(const char *module, const char *name)
255 int fd = open(module, O_RDONLY);
256 unsigned int offset, size;
257 char *map, *strings, *dep = NULL;
262 LOG("failed to open %s\n", module);
266 if (fstat(fd, &s) == -1) {
267 LOG("failed to stat %s\n", module);
271 map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
272 if (map == MAP_FAILED) {
273 LOG("failed to mmap %s\n", module);
277 if (elf_find_section(map, ".modinfo", &offset, &size)) {
278 LOG("failed to load the .modinfo section from %s\n", module);
282 strings = map + offset;
283 while (strings && (strings < map + offset + size)) {
289 sep = strstr(strings, "=");
294 if (!strncmp(strings, "depends=", len + 1))
296 strings = &sep[strlen(sep)];
299 m = alloc_module(name, dep, s.st_size);
308 static int scan_module_folder(void)
310 int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
317 path = alloca(sizeof(DEF_MOD_PATH "*.ko") + strlen(ver.release) + 1);
318 sprintf(path, DEF_MOD_PATH "*.ko", ver.release);
320 if (glob(path, gl_flags, NULL, &gl) < 0)
323 for (j = 0; j < gl.gl_pathc; j++) {
324 char *name = get_module_name(gl.gl_pathv[j]);
330 m = find_module(name);
332 get_module_info(gl.gl_pathv[j], name);
340 static int print_modinfo(char *module)
342 int fd = open(module, O_RDONLY);
343 unsigned int offset, size;
348 LOG("failed to open %s\n", module);
352 if (fstat(fd, &s) == -1) {
353 LOG("failed to stat %s\n", module);
357 map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
358 if (map == MAP_FAILED) {
359 LOG("failed to mmap %s\n", module);
363 if (elf_find_section(map, ".modinfo", &offset, &size)) {
364 LOG("failed to load the .modinfo section from %s\n", module);
368 strings = map + offset;
369 printf("module:\t\t%s\n", module);
370 while (strings && (strings < map + offset + size)) {
376 sep = strstr(strings, "=");
379 dup = strndup(strings, sep - strings);
381 if (strncmp(strings, "parm", 4)) {
383 printf("%s:\t\t%s\n", dup, sep);
385 printf("%s:\t%s\n", dup, sep);
387 strings = &sep[strlen(sep)];
395 static int deps_available(struct module *m, int verbose)
400 if (!strcmp(m->depends, "-") || !strcmp(m->depends, ""))
406 m = find_module(dep);
409 LOG("missing dependency %s\n", dep);
410 if (verbose && m && (m->state != LOADED))
411 LOG("dependency not loaded %s\n", dep);
412 if (!m || (m->state != LOADED))
414 dep += strlen(dep) + 1;
420 static int insert_module(char *path, const char *options)
426 if (stat(path, &s)) {
427 LOG("missing module %s\n", path);
431 fd = open(path, O_RDONLY);
433 LOG("cannot open %s\n", path);
437 data = malloc(s.st_size);
438 if (read(fd, data, s.st_size) == s.st_size)
439 ret = syscall(__NR_init_module, data, s.st_size, options);
441 LOG("failed to read full module %s\n", path);
449 static void load_moddeps(struct module *_m)
454 if (!strcmp(_m->depends, "-") || !strcmp(_m->depends, ""))
460 m = find_module(dep);
463 LOG("failed to find dependency %s\n", dep);
464 if (m && (m->state != LOADED)) {
469 dep = dep + strlen(dep) + 1;
473 static int iterations = 0;
474 static int load_modprobe(void)
479 avl_for_each_element(&modules, m, avl)
480 if (m->state == PROBE)
486 avl_for_each_element(&modules, m, avl) {
487 if ((m->state == PROBE) && (!deps_available(m, 0))) {
488 if (!insert_module(get_module_path(m->name), "")) {
497 if ((m->state == PROBE) || m->error)
506 static int print_insmod_usage(void)
508 LOG("Usage:\n\tinsmod filename [args]\n");
513 static int print_usage(char *arg)
515 LOG("Usage:\n\t%s module\n", arg);
520 static int main_insmod(int argc, char **argv)
522 char *name, *cur, *options;
526 return print_insmod_usage();
528 name = get_module_name(argv[1]);
530 LOG("cannot find module - %s\n", argv[1]);
534 if (scan_loaded_modules())
537 if (find_module(name)) {
538 LOG("module is already loaded - %s\n", name);
545 for (len = 0, i = 2; i < argc; i++)
546 len += strlen(argv[i]) + 1;
548 options = malloc(len);
551 for (i = 2; i < argc; i++) {
556 cur += sprintf(cur, "%s", argv[i]);
559 ret = insert_module(get_module_path(name), options);
563 LOG("failed to insert %s\n", get_module_path(name));
568 static int main_rmmod(int argc, char **argv)
575 return print_usage("rmmod");
577 if (scan_loaded_modules())
580 name = get_module_name(argv[1]);
581 m = find_module(name);
583 LOG("module is not loaded\n");
588 ret = syscall(__NR_delete_module, name, 0);
591 LOG("unloading the module failed\n");
596 static int main_lsmod(int argc, char **argv)
600 if (scan_loaded_modules())
603 avl_for_each_element(&modules, m, avl)
604 if (m->state == LOADED)
605 printf("%-20s%8d%3d %s\n",
606 m->name, m->size, m->usage,
607 (*m->depends == '-') ? ("") : (m->depends));
614 static int main_modinfo(int argc, char **argv)
619 return print_usage("modinfo");
621 module = get_module_path(argv[1]);
623 LOG("cannot find module - %s\n", argv[1]);
627 print_modinfo(module);
632 static int main_modprobe(int argc, char **argv)
638 return print_usage("modprobe");
640 if (scan_loaded_modules())
643 if (scan_module_folder())
646 name = get_module_name(argv[1]);
647 m = find_module(name);
648 if (m && m->state == LOADED) {
649 LOG("%s is already loaded\n", name);
652 LOG("failed to find a module named %s\n", name);
658 fail = load_modprobe();
661 LOG("%d module%s could not be probed\n",
662 fail, (fail == 1) ? ("") : ("s"));
664 avl_for_each_element(&modules, m, avl)
665 if ((m->state == PROBE) || m->error)
666 LOG("- %s\n", m->name);
675 static int main_loader(int argc, char **argv)
677 int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
678 char *dir = "/etc/modules.d/*";
690 path = malloc(strlen(dir) + 2);
694 if (scan_loaded_modules())
697 if (scan_module_folder())
700 syslog(0, "kmodloader: loading kernel modules from %s\n", path);
702 if (glob(path, gl_flags, NULL, &gl) < 0)
705 for (j = 0; j < gl.gl_pathc; j++) {
706 FILE *fp = fopen(gl.gl_pathv[j], "r");
711 LOG("failed to open %s\n", gl.gl_pathv[j]);
715 while (getline(&mod, &mod_len, fp) > 0) {
716 char *nl = strchr(mod, '\n');
723 opts = strchr(mod, ' ');
727 m = find_module(get_module_name(mod));
728 if (!m || (m->state == LOADED))
732 if (basename(gl.gl_pathv[j])[0] - '0' <= 9)
740 fail = load_modprobe();
741 LOG("ran %d iterations\n", iterations);
744 LOG("%d module%s could not be probed\n",
745 fail, (fail == 1) ? ("") : ("s"));
747 avl_for_each_element(&modules, m, avl)
748 if ((m->state == PROBE) || (m->error))
749 LOG("- %s - %d\n", m->name, deps_available(m, 1));
759 int main(int argc, char **argv)
761 char *exec = basename(*argv);
763 avl_init(&modules, avl_strcmp, false, NULL);
764 if (!strcmp(exec, "insmod"))
765 return main_insmod(argc, argv);
767 if (!strcmp(exec, "rmmod"))
768 return main_rmmod(argc, argv);
770 if (!strcmp(exec, "lsmod"))
771 return main_lsmod(argc, argv);
773 if (!strcmp(exec, "modinfo"))
774 return main_modinfo(argc, argv);
776 if (!strcmp(exec, "modprobe"))
777 return main_modprobe(argc, argv);
779 return main_loader(argc, argv);